Distributive shaft Drawing ZIL 130. The main time for heating the heated edges, min

03.03.2021

In almost all four-stroke piston internal combustion motors there is a gas distribution mechanism based on the camshaft. All about the camshafts, their existing types, designs and features of work, as well as about the right choice and replacement of the shafts in the proposed article.

vigators (motors with the bottom of the shaft); Installation in the block head (Motors with the top arrangement of the shaft). Usually there are no additional elements in the lower shafts, their lubricant is performed due to the oil mist in the crankcase and the oil supply under pressure to the support cervices through the sleeve. In the upper shafts, a longitudinal canal is often present and transverse drills are made in support cervices - this ensures lubrication of the shek of the oil supply under pressure. In the engine there may be one or two RVs, in the first case, one shaft provides the drive of all valves, in the second case, one shaft provides the drive only ink valves, the second is only outwards. Accordingly, on the general RV, the number of cams corresponds to the number of all valves, and on each of the separate RV, the number of cams twice as smaller than the total number of valves. The RV drive can be carried out with a belt, chains or gears directly associated with the gearbox of the crankshaft. Today most often use

Device and principle of camshaft

The car engine is a complex mechanism, one of the most important elements of which is a camshaft, which is part of the timing. From the exact and uninterrupted operation of the camshaft largely depends on the normal operation of the engine.

about the engine device, the gas distribution mechanism can have the lower or upper location of the valves. To date, the timing with the top arrangement of the valves is more common. This design allows you to speed up and facilitate the process of service, including adjustment and repair of the camshaft, for which spare parts for camshaft. The device of the camshaft from a structural point of view The engine distribution shaft is associated with the crankshaft, which is ensured due to the presence of a chain and belt. The chain or strap of the camshafts is put on the pricing of the crankshaft or the camshaft pulley. Such a pulley camshaft, like a split gear, is considered the most practical and efficient option, so it is often used quite often for tuning engines to increase their power. Bearings, inside of which the rotation of the cords of the camshaft occurs, are located on the head of the cylinder block. If the fasteners of the necks come out

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1. INTRODUCTION

2 Technological part

2.7 Selection of installation bases

2.8.1 Application

2.8.2 Grinding

2.8.3 Polishing

2.8.4 Grinding

2.8.5 Approval

2.8.7 Tokarnaya

2.8.8 Slipping

2.8.9 Turning operation

2.8.10 Milling

2.9.1 Application

2.9.2 Grinding

2.9.3 Polishing

2.9.4 Grinding

2.9.5 Sports

2.9.6 Grinding

2.9.7 Tokarnaya

2.9.8 Slipping

2.9.9 Tokarnaya

2.9.10 Milling

2.10 Operating card

3 Design part

4 Conclusion

1. INTRODUCTION

The growth of the car park of our country led to the creation of auto repair production. The need for repairing machines arises together with their appearance, therefore, the human activity aimed at meeting this needs exists as much as the machines exist. Well-established repair production allows you to maximize the service life of cars. During the downtime of the car on repair, the company suffers losses. It is necessary to bring the car to the line as quickly as possible, it is possible only with quick and high-quality repairs. To perform such a repair, you need an accurate calculation of the sequence of operations, time and methods to eliminate defects.

More and more ATPs pay great attention to the integrated organization of restoration work. In the complex recovery, the repair time and labor intensity is reduced. Currently, there are many car repair factories that are engaged in the overhaul of cars and their systems and aggregates. This makes it possible to provide higher reliability of the car in further operation and the car restored after overhaul by 30-40% cheaper than the cost of a new car that is very important for ATP. Many details that are subject to recovery can be repaired can be repaired on ATP which has special technological equipment This for the company will cost a shorter period and lower material costs.

Effectively manage such a large area of \u200b\u200bactivity as auto repair production, it is necessary to rely on modern scientific knowledge and have a well-organized engineering service. The organization of car repair in our country is constantly paying much attention. Thanks to the development of effective methods for restoring worn parts, progressive technology of the collected assembly complex of works and the introduction of more advanced technical means in repair production, prerequisites were created to increase the resource of cars after major repairs, although at present the resource of the repaired car is 60-70% of the resource of new cars And the cost of repair remains high.

2 Technological part

2.2 Working conditions of the camshaft ZIL - 130

During operation, the camshaft is subjected to: periodic loads from the power of gases and inertia of mass movement, which cause alternating voltage in its elements; friction necks about bear liners; friction at high specific pressures and loads with abrasive; Dynamic loads; bending and twisting, etc. They are characterized by the following types of wear - oxidative and disruption of fatigue strength, molecular - mechanical, corrosion-mechanical and abrasive. They are characterized by the following phenomena - formation of products of chemical interaction of metals with a medium and destruction of individual surface layer microdistricons with a material separation; molecular grasp, transfer of material, the destruction of possible bonds with the withdrawal of particles, etc.

2.3 Choosing rational ways to eliminate defects

Wearing of the supporting necks grind to one of the repair sizes. Grinding is carried out on a round-grinding machine. Since the simplicity of the technological process and the equipment used; high economic efficiency; Preserving the interchangeability of parts within a certain repair size.

With the wear of the thread, it is eliminated by the vibrational surfacing, since a small heating of the part does not have an impact on their heat treatment, a small thermal influence zone, a fairly high process performance.

With the wear of the eccentric it is applied and then grinding on the grinding machine. Since: simple technological process and equipment application; high economic efficiency; Preserving the interchangeability of parts within a certain repair size.

distributional car Defect

2.4 Development of technological process schemes, elimination of each defect separately

Table 1

	Methods of repair details	Operations	Operations
			Galvanic (iron)
Wear a support neck	Ironing		Grinding (grind neck) Polishing (polishing cervix)
			Tokar-screwing
Worn thread	Supplement under the flux layer		(cut off the worn thread) Tokar-screwing (Drain, cut the thread)
			Skillar (cry
Wear a groove	Supplement under the flux layer		Turning and screwing (cutting) Horizontal milling (milling grooves)
			Watching
Worn eccentric	Application		(Apply eccentric) Turning cutter (sharpening eccentric) Round-grinding (grind eccentric)

2.5 Technological operations plan with selection of equipment, devices and tools

the name of the operation	Equipment	Fixtures	Tool

Galvanic (iron)	Bath for ironing	Suspension for ironing	Brush for isolation	Calipers
Grinding (Grind cervix	Round-grinding steel-binary151	Leading patron	Grinding wheel d \u003d 450	Micrometer 25-50 mm
Polished (polish neck)
Turning and screwing (cut off the thread)
Surfacing (lay a neck for the thread)
Tokar-screwing (sharpening, cutting the thread)
Surfacing (cry the groove)
Tokar-screwing (Calculation)
Milling (milling groove)
Surfacing (to apply externric)
Tokar-screwing (sharpening eccentric)
Round-grinding (grind eccentric)

2.6 Brief Equipment Feature

Turning and screw machine 1K62

1 distances between centers, mm 710, 1000, 1400

2 The largest diameter of the processing of the rod passing through the spindle, mm 36

Over the caliper - 220

Above bed - 400

3 Number of spindle speeds 12.5, 16, 20, 25, 31,5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 250, 800, 1000, 500, 630, 800, 1000, 1250, 1600, 2000

4 Longitudinal conveyance of the caliper in mm per 1 spindle turnover 0.07, 0.074, 0.084, 0.097, 0.11, 0.12, 0.13, 0.14, 0.15, 0.17, 0.195, 0.21, 0.23, 0.26, 0.28, 0.3, 0.34, 0.39, 1.04, 1,21, 1.4, 1.56, 2.08, 2.42, 2, 8, 3.8, 4,16

5 Cross feeds of the caliper 0.035, 0.037, 0.042, 0.048, 0.055, 0.065, 0.07, 0.074, 0.084, 0.097, 0.11, 0.12, 0.26, 0.28, 0.3, 1.04, 1,21, 1.04, 2,08, 3,48, 4,16

6 10 kW electric motor power

7 Overall dimensions of the machine, mm

length 2522, 2132, 2212

width 1166.

height 1324.

8 Machine Machine 2080-2290 kg

Round-grinding machine

1 The largest diameter of the product being processed 200 mm

2 Grinding circle diameter, mm 450-600

3 Most Moving Table 780 mm

4 The greatest transverse movement of the grandmother grinding circle 200 mm

5 The greatest length of the grinding product 7500 mm

6 Power of the main electric motor 7 kW

7 Number of spindle speed grinding grandmother per minute - 1080-1240

8 The speed of the spindle of the front grandmother per minute 75; 150; 300

9 limits of the speed of the longitudinal stamp of the table of meters per minute 0/8 $ 10

Horizontal milling machine 6N82

1 Dimensions of the working surface of the table, in mm 1250x320

2 The greatest movement of the table, in mm

longitudinal - 700.

transverse - 250.

vertical - 420.

3 Number of spindle revolutions per minute - 30; 37.5; 47.5; 60; 75; 95; 118; 150; 190; 235; 300; 375; 475; 600; 750; 950; 1180; 1500.

4 longitudinal and transverse feed, r / min - 19; 23.5; thirty; 37.5; 47.5; 60; 75; 95; 150; 190; 235; 300; 375; 475; 600; 750; 950.

5 Vertical feeds are 1/3 from longitudinal

6 Power of the electric motor, in kW

spent spindle - 7

present feed - 2.2

7 Machine envelope, in mm - 2100x1740x1615

8 Machine weight, kg - 3000

2.7 Selection of installation bases

With the wear of the support necks, the installation base will be a cervix under the distribution gear and the gear for the thread.

When wearing the carving of the installation base will be supporting cakes.

With the wear of the eccentric, the installation base will be a cervix under the distribution gear and the gear under the thread.

2.8 Calculation of cutting regimens and time standards

2.8.1 Application

2) to remove the peaks of the cam;

3) Remove the item.

Welding force:

DA - current density (L-1 p. 313 tab. IV 3.3), A / mm2.

Mass of molten metal:

G / min, (2)

where en - the coefficient of surfacing (L-1 page 313 tab. IV 3.3), g / a · h.

, sm3 / min, (3)

where r - the density of the molten metal taken equal

the density of the melted metal, g / cm3.

sM3 / min.

, m / min, (4)

m / min.

Speed \u200b\u200bsurfacing:

, m / min, (5)

t \u003d 1.5 mm;

S \u003d 0.3 mm / about.

m / min,

, rpm, (6)

where D is a dimeter of the floor part, mm.

rpm,

min. (7)

Let's take: \u003d 0.6 min;

\u003d 0.22 min.

min

min. (eight)

Let's take: L \u003d 0.6927 m;

tB2 \u003d 0.14 min.

min

nP - the number of heated.

Let's take: F \u003d 18 mm2;

aN \u003d 2.5 g / A · h;

r \u003d 7.8 g / cm3;

\u003d 0.1 min;

nP \u003d 1.

min

min, (9)

min.

2.8.2 Grinding

2) grinding cams;

3) Remove the item.

, m / min, (10)

where CV is a constant value depending on the material being processed, the nature of the circle and the type of grinding;

t - the depth of grinding, mm;

Let's take:

CV \u003d 0.24 (L1 p. 369 tab. 4.3.92);

b \u003d 0.25;

d \u003d 1.5 mm;

t \u003d 0.05 mm.

m / min.

We determine the rotational speed:

, rpm, (11)

p \u003d 3.14;

S \u003d B · b, mm / O, (12)

circle;

S \u003d 0.25 · 1700 \u003d 425 mm / about.

Determine the main time:

tO \u003d · I · K / N · S, Min, (13)

S - longitudinal feed, mm / about;

(L1 p. 370);

i - number of passes.

L \u003d L + B, mm, (14)

L \u003d 1.5 + 1700 \u003d 1701,5 mm

, (15)

.

Let's take: s \u003d 0.425 m;

K \u003d 1.4;

i \u003d 1.

min.

Piece definition:

tCT \u003d TO + TUV + TVP + TORM, MIN, (16)

where To is the main time, min;

tVP - auxiliary time associated with the transition, min.

Let's take: tv \u003d 0.25 min;

tNP \u003d 0.25 min.

min, (17)

min, (18)

min

min.

2.8.3 Polishing

1) install the item in the leashed cartridge;

2) polish cams;

3) Remove the item.

Determine the speed of rotation of the processed part:

, m / min, (19)

where CV is a constant value depending on the material being processed,

the nature of the circle and the type of grinding;

d - diameter of the treated surface, mm;

T - the resistance of the grinding circle, mm;

t - the depth of grinding, mm;

b - the coefficient determining the fraction of the width of the grinding circle

k, M, XV, YV - Indicators of the degree.

We will take: CV \u003d 0.24 (L1 p. 369 Tab. 4.3.92);

k \u003d 0.3 (L1 p. 369 Table. 4.3.92);

m \u003d 0.5 (L1 p. 369 Table. 4.3.92);

xv \u003d 1.0 (L1 p. 369 tab. 4.3.92);

yv \u003d 1.0 (L1 p. 369 tab. 4.3.92);

T \u003d 0.3 min (L1 p. 369 Table. 4.3.92);

b \u003d 0.25;

d \u003d 1.5 mm;

t \u003d 0.05 mm.

m / min.

We determine the rotational speed:

, rpm, (20)

where VD is the speed of grinding, m / min;

S \u003d B · B, mm / O, (21)

where b is the width of the grinding circle, mm;

b - coefficient determining the share of grinding width

circle.

Let us take: B \u003d 0.50 (L1 p. 369 Tab. 4.3.90 - 4.3.91);

B \u003d 1700, mm.

S \u003d 0.50 · 1700 \u003d 850 mm / vol.

Determine the main time:

tO \u003d · I · K / N · S, Min, (22)

where L is the estimated length of grinding, min;

y - the magnitude of the cutting of the cutter and the output of the instrument, mm;

S - longitudinal feed, mm / about;

K - coefficient-dependent grinding accuracy and circle wear,

(L1 p. 370);

i - number of passes.

L \u003d L + B, mm, (23)

L \u003d 1.5 + 1700 \u003d 1701.5 mm,

, (24)

.

Let's take: S \u003d 0.850 m;

K \u003d 1.4.

min.

Piece definition:

tCT \u003d TO + TUV + TVP + TORM, MIN, (25)

where To is the main time, min;

tv - auxiliary time on the installation and removal of the part, min;

tv \u003d 0.25, min;

tNP \u003d 0.25, min.

min, (26)

min, (27)

min

min.

2.8.4 Grinding

1) install the item in the leashed cartridge;

2) grind neck;

3) Remove the item.

Determine the speed of rotation of the processed part:

, m / min, (28)

d - diameter of the treated surface, mm;

T - the resistance of the grinding circle, mm;

t - the depth of grinding, mm;

b - the coefficient determining the fraction of the width of the grinding circle

k \u003d 0.3 (L1 p. 369 Table. 4.3.92);

m \u003d 0.5 (L1 p. 369 Table. 4.3.92);

xv \u003d 1.0 (L1 p. 369 tab. 4.3.92);

yv \u003d 1.0 (L1 p. 369 tab. 4.3.92);

T \u003d 0.3 min (L1 p. 369 Table. 4.3.92);

b \u003d 0.25;

d \u003d 0.054 m;

t \u003d 0.05 mm.

m / min.

We determine the rotational speed:

, rpm, (29)

where VD is the speed of grinding, m / min;

p \u003d 3.14;

d - Diameter of the processed part, m.

S \u003d B · b, mm / O, (30)

where b is the width of the grinding circle, mm;

b \u003d 0.25 (L1 p. 369 Tab. 4.3.90 - 4.3.91).

S \u003d 0.25 · 1700 \u003d 425 mm / about.

Determine the main time:

tO \u003d · I · K / N · S, Min, (31)

where L is the estimated length of grinding, min;

y - the magnitude of the cutting of the cutter and the output of the instrument, mm;

S - longitudinal feed, mm / about;

K - coefficient-dependent grinding accuracy and circle wear,

(L1 p. 370);

i - number of passes.

L \u003d L + B, mm, (32)

L \u003d 54 + 1700 \u003d 1754 mm,

, (33)

.

Let's take: s \u003d 0.425 m;

K \u003d 1.4.

min.

Piece definition:

tCT \u003d TO + TUV + TVP + TORM, MIN, (34)

where To is the main time, min;

tv - auxiliary time on the installation and removal of the part, min;

tVP - auxiliary time associated with the transition, min;

tv \u003d 0.25, min;

tNP \u003d 0.25, min.

min, (35)

min, (36)

min

min.

2.8.5 Approval

1) Install the detail on the neck under the distribution gear and the gear for the thread;

2) to notice the necks;

3) Remove the item.

Welding force:

, A / mm, (37)

where D2 is the diameter of the flood wire, mm;

Daist density, A / mm2.

Let's take: d \u003d 1.5 mm;

A / mm.

Mass of molten metal:

, g / min, (38)

g / min.

We determine the mass of molten metal:

, sm3 / min, (39)

sM3 / min.

where r \u003d 0.78 is the density of the molten metal, received

equal to the density of the melted metal, g / cm3.

Speed \u200b\u200bfeed wire:

, m / min, (40)

m / min.

Speed \u200b\u200bsurfacing:

, m / min, (41)

where k \u003d 0.8 (L-1 page 314 tab. IV 3.7);

a \u003d 0.9 (L-1 page 314 tab. IV 3.7);

t \u003d 1.5 mm;

S \u003d 0.3 mm / about.

m / min.

Determine the number of revolutions :

, rpm, (42)

rpm,

min. (43)

Let's take: \u003d 0.6 min;

\u003d 0.22 min.

min

min. (44)

Let's take: L \u003d 0.6927 m;

tB2 \u003d 0.14 min.

min

min.

where F is a cross section of a seam or roller, mm2;

aN - the coefficient of surfacing (L-1 page 313 tab. IV 3.3), g / a · h;

r is the density of the molten metal, received equal to the density of the melted metal, g / cm3;

- the main time to warm up the heated edges, min;

nP - the number of heated.

Let's take: F \u003d 18 mm2;

aN \u003d 2.5 g / A · h;

r \u003d 7.8 g / cm3;

\u003d 0.1 min;

nP \u003d 1.

min

min, (45)

min.

2.8.6 Grinding for Repair Size

1) install the item in the leashed cartridge;

2) Grind 4 cervix under the repair size;

3) Remove the item.

Determine the speed of rotation of the processed part:

, m / min, (46)

where CV is a constant value depending on the material being processed, the nature of the circle and the type of grinding, CV \u003d 0.24 (L1 p. 369 Tab. 4.3.92);

d - diameter of the treated surface, mm;

T - the resistance of the grinding circle, mm;

t - the depth of grinding, mm;

b - the coefficient determining the fraction of the width of the grinding circle

k, M, XV, YV - Indicators of the degree;

k \u003d 0.3 (L1 p. 369 Table. 4.3.92);

m \u003d 0.5 (L1 p. 369 Table. 4.3.92);

xv \u003d 1.0 (L1 p. 369 tab. 4.3.92);

yv \u003d 1.0 (L1 p. 369 tab. 4.3.92);

T \u003d 0.3 min (L1 p. 369 Table. 4.3.92);

b \u003d 0.25;

d \u003d 0.054 m;

t \u003d 0.05 mm.

m / min.

We determine the rotational speed:

, rpm, (47)

where VD is the speed of grinding, m / min;

p \u003d 3.14;

d - diameter of the processed part, mm.

S \u003d B · B, mm / O, (48)

where b is the width of the grinding circle, mm;

b is a coefficient that determines the share of the width of the grinding circle;

b \u003d 0.25 (L1 p. 369 Tab. 4.3.90 - 4.3.91).

S \u003d 0.25 · 1700 \u003d 425 mm / about.

Determine the main time:

tO \u003d · I · K / N · S, Min, (49)

where L is the estimated length of grinding, min;

y - the magnitude of the cutting of the cutter and the output of the instrument, mm;

S - longitudinal feed, mm / about;

K - coefficient-dependent grinding accuracy and circle wear,

(L1 p. 370);

i - number of passes.

L \u003d L + B, mm, (50)

L \u003d 55.45 + 1700 \u003d 1755.45 mm,

, (51)

.

Let's take: s \u003d 0.425 m;

K \u003d 1.4.

min.

Piece definition:

tCT \u003d TO + TUV + TVP + TORM, MIN, (52)

where To is the main time, min;

tv - auxiliary time on the installation and removal of the part, min;

tVP - auxiliary time associated with the transition, min;

tv \u003d 0.25 min;

tNP \u003d 0.25 min.

min, (53)

min, (54)

min

min.

2.8.7 Tokarnaya

1) install the item in the leashed cartridge;

2) cut off the worn thread;

3) Remove the item.

Determining the size of the cutting of the cutter and the output of the instrument:

y \u003d u1 + u2 + u3, mm, (55)

:

, mm, (56)

mm,

y \u003d 0.2 + 3 + 3 \u003d 6.2 mm.

Determination of cutting speed:

, mm / O, (57)

working conditions;

CV \u003d 141 (L-1 page 345 Tab. IV 3.54);

gv \u003d 0.35 (L-1 p. 345 tab. IV 3.54);

mm / about.

Determine the number of revolutions:

, rpm, (58)

rpm.

min, (59)

n - the number of revolutions;

min.

Piece definition:

tBT \u003d TO + TUV + TVP + TORM, MIN, (60)

where To is the main time, min;

tv - auxiliary time on the installation and removal of the part, min;

tVP - auxiliary time associated with the transition, min;

min, (61)

min, (62)

min

min.

2.8.8 Slipping

1) set the item to the fixture for fastening the support necks;

2) Remove the neck for the thread;

3) Remove the item.

Welding force:

, A / mm, (63)

where D2 is the diameter of the flood wire, mm;

Da - current density, a / mm2;

d \u003d 1.5 mm;

Da \u003d 85 A / mm2 (L-1 page 313 Tab. IV 3.3).

A / mm.

Mass of molten metal:

, g / min, (64)

where An \u003d 7.2 is the coefficient of surfacing (L-1 page 313 tab. IV 3.3), g / a · h.

g / min.

We determine the mass of molten metal:

, sm3 / min, (65)

where r \u003d 0.78 g / cm3 - the density of the molten metal, received

equal to the density of the melted metal.

sM3 / min.

Speed \u200b\u200bfeed wire:

, m / min, (66)

m / min.

Speed \u200b\u200bsurfacing:

, m / min, (67)

where k \u003d 0.8 (L-1 page 314 tab. IV 3.7);

a \u003d 0.9 (L-1 page 314 tab. IV 3.7);

t \u003d 1.5 mm;

S \u003d 0.3 mm / about.

m / min,

, rpm, (68)

where d \u003d 54 is a dimeter of the floor part, mm.

rpm,

min. (69)

Let's take: \u003d 0.6 min;

\u003d 0.22 min.

min

min, (70)

Let's take: L \u003d 0.6927 m;

tB2 \u003d 0.14 min.

min

min.

where F is a cross section of a seam or roller, mm2;

aN - the coefficient of surfacing (L-1 page 313 tab. IV 3.3), g / a · h;

r is the density of molten metal taken equal

the density of the melted metal, g / cm3;

- the main time to warm up the heated edges, min;

nP - the number of heated.

Let's take: F \u003d 18 mm2;

aN \u003d 2.5 g / cm3;

r \u003d 7.8 g / cm3;

\u003d 0.1 min;

nP \u003d 1.

min

min, (71)

min.

2.8.9 Turning operation

1) install the item in the leashed cartridge;

2) twist the neck and cut the thread;

3) Remove the item.

Determining the size of the cutting of the cutter and the output of the instrument:

y \u003d u1 + u2 + u3, mm, (72)

where U1 is the size of the cutting cutter, mm;

u2 - cutter run (2 - 3 mm);

u3-import test shavings (2 - 3 mm).

We determine the cutting size of the cutter:

, mm, (73)

where T \u003d 0.2 mm is the depth of cutting;

c is the main angle of the cutter in the plan (C \u003d 45є).

mm,

y \u003d 0.2 + 3 + 3 \u003d 6.2 mm.

Determination of cutting speed:

, mm / O, (74)

where CV, XV, YV - coefficients depending on the working conditions;

K - correction coefficient characterizing specific

working conditions;

S - Cutter feed (0.35 - 0.7 mm / O, L-1 p. 244 tab. IV 3.52);

on the machine we accept s \u003d 0.5 mm / about;

CV \u003d 170 (L-1 page 345 tab. IV 3.54);

xV \u003d 0.18 (L-1 p. 345 tab. IV 3.54);

gv \u003d 0.20 (L-1 page 345 tab. IV 3.54);

K \u003d 1.60 (L-1 page 345 Tab. IV 3.54).

mm / about.

Determine the number of revolutions:

, rpm, (75)

where D is the diameter of the treated surface, mm.

rpm.

Determination of the main time on the cervix:

min, (76)

where L \u003d 18 mm, the length of the surface being processed;

y - the amount of cutter cutter, mm;

n - the number of revolutions;

S \u003d 0.35 - 0.7 mm / about the feed of the cutter (L-1 page 244 tab. IV 3.52);

the machine is accepted by S \u003d 0.5 mm / about.

We accept the passport immediate n \u003d 500 rpm.

min.

Piece definition:

tBT \u003d TO + TUV + TVP + TORM, MIN, (77)

where To is the main time, min;

tv - auxiliary time on the installation and removal of the part, min;

tVP - auxiliary time associated with the transition, min;

tv \u003d 0.25 min (L-1 p. 347 tab. IV 3.57);

tBP \u003d 0.25 min (L-1 p. 347 tab. IV 3.57).

min, (78)

min, (79)

min

min.

2.8.10 Milling

1) Install the item to the bracket or jack;

2) milling lying;

3) Remove the item.

Determine the magnitude of the last milling:

y \u003d u1 + u2, mm, (80)

where U1 is the magnitude of the cutting cutters, mm;

u2 is the magnitude of the flow of the cutter, mm.

, mm, (81)

where d \u003d 90 mm - the diameter of the cutter;

B \u003d 2 mm - milling width.

mm,

mm.

Determine the cutting speed:

, mm / O, (82)

where a, m, xv, gv, zv, qv, kv - coefficients depending on the material and the type of cutters (L-1 page 362 tab. IV 3.81);

A \u003d 21.96 (L-1 p. 362 tab. IV 3.81);

m \u003d 0.2 (L-1 page 362 tab. IV 3.81);

xV \u003d 0.1 (L-1 page 362 Tab. IV 3.81);

gv \u003d 0.4 (L-1 p. 362 tab. IV 3.81);

zv \u003d 0.25 (L-1 p. 362 tab. IV 3.81);

qv \u003d 0.15 (L-1 p. 362 tab. IV 3.81);

RV \u003d 0.1 (L-1 p. 362 tab. IV 3.81);

B \u003d 2 mm milling width;

T \u003d 135 mm Pillar resistance.

mm / about.

Determine the revs:

, rpm, (83)

rpm.

Determine the supply of cutters:

, mm / O, (84)

where SO is the flow of one turn of the cutter, mm / about;

n - frequency of rotation of the cutter;

SO \u003d 0.12 mm / about.

mm / about.

Determination of the main time on the surfacing of the slotted depression:

min, (85)

where L is the length of milling, mm;

y - the magnitude of the cutting cutters, mm;

n - the number of revolutions cutter rpm;

S - supply cutters, mm / OB;

l \u003d 5 mm,

i \u003d 1.

min.

Piece definition:

tCT \u003d TO + TUV + TVP + TORM, MIN, (86)

where To is the main time, min;

tv - auxiliary time on the installation and removal of the part, min;

tVP - auxiliary time associated with the transition, min;

tv \u003d 0.25 min (L-1 p. 347 tab. IV 3.57);

tBP \u003d 0.25 min (L-1 p. 347 tab. IV 3.57).

min, (87)

min, (88)

min

min.

2.8.11 Plumbing operation

1) install the item in vice;

2) to drive the thread of the piercing;

3) Remove the item.

Piece definition:

min, (89)

where Tus is time for installing and removing the part, min;

torrm - time on the organization of the workplace, min.

min, (90)

where T1cm is the time for processing 1 centimeter, min.

, mm, (91)

mm,

min

min.

2.9 Determination of piece - Calculation Time

min, (92)

where TST is a piece time, min;

T PZ - preparatory and final time, min;

Z - the number of parts in the party.

Determine the size of parts in the party:

Z \u003d UTPZ / UTST · K, (93)

where UTPZ - the total preparatory and final time on all

operations, min;

UTST - total piece time for all operations, min;

K is a seriality coefficient, 0.05.

.

2.9.1 Application

min.

2.9.2 Grinding

min.

2.9.3 Polishing

min.

2.9.4 Grinding

min.

2.9.5 Sports

min.

2.9.6 Grinding

min.

2.9.7 Tokarnaya

min.

2.9.8 Slipping

min.

2.9.9 Tokarnaya

min.

2.9.10 Milling

min.

2.9.11 Plumbing

min.

2.10 Operating card

Table 5.

	tool
		measuring

Application 2. Remove the peaks of the cam 3. Remove the detail	Grinding wheel	Calipers
Grinding 2. Grind Kulachka 3. Remove the detail	Grinding wheel
Polishing 1. Install the item in a leashed cartridge. 2. Polish the item. 3. Remove the item.	Abrasive ribbon
Grinding 1. Install the item in a leashed cartridge 2. Grind cervix 3. Remove the detail	Grinding wheel
Application 1. Install the detail on the neck under the distribution gear and the gear for the thread 2. Remove Shaki 3. Remove the detail		Calipers
Grinding for repair size 1. Install the item in a leashed cartridge 2. Grind 4 cervical sizes 3. Remove the detail	Grinding wheel
Tokar 1. Install the item in a leashed cartridge 2. Cut the worn thread 3. Remove the detail	Stroke	Calipers
Application 1. Install the item in the fixture for fastening the support necks 2. Remove the neck for the thread 3. Remove the detail		Calipers
Tokar 1. Install the item in a leashed cartridge 2. Soak the neck and cut the thread 3. Remove the detail	Passing straight cutter with a record	Calipers
Milling 1. Install the item in the bracket or jack 2. Milling Lysk. 3. Remove the detail	Cylindrical cutter	Calipers
Plumbing 1. Install the item in vice 2. Run thread 3. Remove the detail		Threaded Ring

3 Design part

3.1 Description of the device and operation of the device

The device is intended for the jamming of the ZMZ engine distribution shaft - 402.10

The device consists of a handle 1, 2 housings, 3 M6 nuts (2 pieces), 4 washer 6 (2 pieces), 5 finger (2 pieces).

4 Conclusion

Performing a course project, I learned to choose rational ways to eliminate defects.

Methods and methods that I applied in the calculations are not time-consuming and have a low cost, which has an important role for the economy of the auto repair enterprise.

These defects can be restored in small enterprises, where there is a turning, grinding and galvanic workshop, and there are also necessary specialists.

I also learned to use the literature, choose certain forms to calculate cutting regimes and time standards.

He learned how to draw up an operating card, found out that such a major time, preparatory-final time, time to install and remove the part, time associated with transitions, organizational and piece time.

I learned the device and the work of the device, got acquainted with the brief description of the equipment, learned to choose it to eliminate defects.

And I learned how to develop the schemes of the technological process, to draw up a plan for technological operations with the selection of necessary equipment, devices, tools.

BIBLIOGRAPHY

1 Alexandrov V.A. "Certificate of Normizer" M.: Transport, 1997 - 450c.

2 Vanchukievich V.D. "Certificate of Grinding" M.: Transport, 1982 - 480s.

3 Karagodin V.I. "Repair of cars and engines" M.: "Mastery", 2001 - 496s.

4 Klebanov B.V., Kuzmin V.G., Maslov V.I. "Car repair" M.: Transport, 1974 - 328C.

6 Molodhin V.P. "Handbook of the Young Tokary" M.: Moscow Worker, 1978 - 160s.

7 "Methodical instructions on course design" 2 part. Gorky 1988 - 120s.

Posted on Allbest.ru.

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1. INTRODUCTION

2 Technological part

2.2 Distribution Conditions

wALE ZIL - 130

2.3 Choosing rational ways to eliminate defects

Defect 1.

Defect 2.

Defect 3.

2.4 Development of technological process schemes, elimination of each defect in the departmentb like

Table 1

Defects	Methods of repair details	Operations	Operations
1st scheme			Galvanic (iron)
Wear a support neck	Ironing		Grinding (grind neck) Polishing (polishing cervix)
2nd scheme			Tokar-screwing
Worn thread M30x2.	Supplement under the flux layer		(cut off the worn thread) Tokar-screwing (Drain, cut the thread)
3rd scheme			Skillar (cry
Wear a groove	Supplement under the flux layer		groove) Turning and screwing (cutting) Horizontal milling (milling grooves)
4th scheme			Watching
Worn eccentric	Application		(Apply eccentric) Turning cutter (sharpening eccentric) Round-grinding (grind eccentric)

2.5 Technological operations plan with selection of equipment, devices and tools

P.P.	the name of the operation	Equipment	Fixtures	Tool
P.P.	the name of the operation	Equipment	Fixtures			working	Measurable tean
	Galvanic (also-climbing)	Bath for ironing	Suspension for ironing	Brush for isolation	Calipers
	Grinding (Grind cervix		Leash	Grinding wheel d \u003d 450	Micrometer 25-50 mm
	Polished (polish neck)	Round-grinding steel-binary151	Leash	Polishing circle	Micrometer 25-50 mm
	Turning and screwing (cut off the thread)			StrokeI5K6.	Calipers
	Surfacing (lay a neck for the thread)	Installation for surfacing		Welding nia voloka	Calipers
	Tokar-screwing (sharpening, cutting the thread)	Turning and screw machine 1K62	Leopal Cartridge with centers	StrokeI5K6.	Calipers limit threaded ring
	Surfacing (cry the groove)	Installation for surfacing	Three-tech self-centered patron	Welding nia voloka
	Tokar-screwing (Calculation)	Turning and screw machine 1K62	Leopal Cartridge with centers	StrokeI5K6.	Calipers
	Milling (milling groove)	Horizontally- milling Machine 6N82G.	Krachte- grombrat	Cylinder dr. kaya cutter	Calipers
	Surfacing (to apply externric)	Installation for surfacing	Three-tech self-centered patron	Welding nia voloka	Calipers
	Tokar-screwing (sharpening eccentric)	Turning and screw machine 1K62	Leopal Cartridge with centers	StrokeI5K6.	Calipers
	Round-grinding (grind eccentric)	Round-grinding steel-binary151		Grinding wheel d \u003d 150	Micrometer 25-50 mm

2.6 Brief Equipment Feature

Turning and screw machine 1K62

1 distances between centers, mm 710, 1000, 1400

2 The largest diameter of the processing of the rod passing through the spindle, mm 36

Over the caliper - 220

Above bed - 400

3 Number of spindle speeds 12.5, 16, 20, 25, 31,5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 250, 800, 1000, 500, 630, 800, 1000, 1250, 1600, 2000

5 Cross feeds of the caliper 0.035, 0.037, 0.042, 0.048, 0.055, 0.065, 0.07, 0.074, 0.084, 0.097, 0.11, 0.12, 0.26, 0.28, 0.3, 1.04, 1,21, 1.04, 2,08, 3,48, 4,16

6 10 kW electric motor power

7 Overall dimensions of the machine, mm

Length 2522, 2132, 2212

Width 1166.

Height 1324.

8 Machine Machine 2080-2290 kg

Round-grinding machine

1 The largest diameter of the product being processed 200 mm

2 Grinding circle diameter, mm 450-600

3 Most Moving Table 780 mm

4 The greatest transverse movement of the grandmother grinding circle 200 mm

5 The greatest length of the grinding product 7500 mm

6 Power of the main electric motor 7 kW

7 Number of spindle speed grinding grandmother per minute - 1080-1240

8 The speed of the spindle of the front grandmother per minute 75; 150; 300

9 limits of the speed of the longitudinal stamp of the table of meters per minute 0/8 $ 10

Horizontal milling machine 6N82

1 Dimensions of the working surface of the table, in mm 1250x320

2 The greatest movement of the table, in mm

longitudinal - 700.

transverse - 250.

vertical - 420.

3 Number of spindle revolutions per minute - 30; 37.5; 47.5; 60; 75; 95; 118; 150; 190; 235; 300; 375; 475; 600; 750; 950; 1180; 1500.

4 longitudinal and transverse feed, r / min - 19; 23.5; thirty; 37.5; 47.5; 60; 75; 95; 150; 190; 235; 300; 375; 475; 600; 750; 950.

5 Vertical feeds are 1/3 from longitudinal

6 Power of the electric motor, in kW

spent spindle - 7

present feed - 2.2

7 Machine envelope, in mm - 2100x1740x1615

8 Machine weight, kg - 3000

2.7 Selection of installation bases

Defect 1.

With the wear of the support necks, the installation base will be a cervix under the distribution gear and the gear for the thread.

Defect 2.

When wearing the carving of the installation base will be supporting cakes.

Defect 3.

With the wear of the eccentric, the installation base will be a cervix under the distribution gear and the gear under the thread.

2.8 Calculation of cutting regimens and time standards

2.8.1 Galvanic operation

1) wipe the detail of the rag;

2) clean the surfaces covered;

3) Mount the parts on the suspension

4) isolate places that do not require

5) Degreased Detail

6) Rinse in cold water

7) to be treated on an anode in a 30% acid solution

8) wash in cold running water

9) wash in hot water

10) drill in the main bath

11) withstand in the bath without current

12) Turn on the current and gradually increase the current density

13) Apply a layer of metal

14) unload the detail from the bath

15) rinse in cold water

16) Rinse in hot water

17) neutralize in salt solution

18) wash in hot water

19) Sew

20) Remove the part from the suspension

Main time:

The amount of promptly overlapping time before loading the parts in the bath:

Σ T. op.n \u003d 2 + 0.4 + 0.4 + 0.5 + 10 + 10 \u003d 23.3

Time to load parts in the main bath and on the unloading of the batht V.N:

a) the time of movement of the worker in the process of operation 0.10 min

b) time to move one suspension 0.18

c) Loading and unloading trolley 0.18

d) time for loading parts in the bath and unloading 0.30

t V.N \u003d 0.1 + 0.18 + 0.18 + 0.30 \u003d 0.76

General overlapping time:

134,7+(0,76+23,3)=158,76

Overlapping time:

Cleaning and watched parts 0.4; 0.28 min

Time for mounting on the suspension 0.335 min

Time to insulation not covered surfaces 14.5 min

14,5+0,4+0,28+0,335=15,5

Piece of calculation

Workplace service time

t \u003d 23,3 * 0.18

The number of parts simultaneously downloaded to the bath

The number of baths at the same time served by one worker

2.8.2 round-grinding

2) grind neck;

3) Remove the item.

Determine the speed of rotation of the processinge my item:

M / min, (10)

where c V. - constant value depending on the material being processed,

The nature of the circle and the type of grinding;

d. - diameter of the treated surface, mm;

T - the resistance of the grinding circle, mm;

t. - grinding depth, mm;

β - The coefficient determining the proportion of the width of the grinding circle

K, m, x v, y v - Indicators.

M / min.

We determine the rotational speed:

Rpm, (11)

where V d - grinding speed, m / min;

π \u003d 3.14;

d. - diameter of the processed part, mm.

1000 · 4,95

n \u003d 105,09 rpm,

3,14 · 1,5

S \u003d β · b, mm / O, (12)

where B. - width of the grinding circle, mm;

β - coefficient determining the share of grinding width

Circle;

β \u003d 0.25 (L1 p. 369 Table. 4.3.90 - 4.3.91).

S. \u003d 0.25 · 1700 \u003d 425 mm / vol.

Determine the main time:

t O \u003d · I · K, Min, (13)

n · S.

where L. - the estimated length of grinding, min;

y. - the magnitude of the cutting of the cutter and the output of the tool, mm;

S. - longitudinal feed, mm / about;

K - coefficient-dependent grinding accuracy and circle wear,

(L1 p. 370);

i. - number of passes.

L \u003d L + B, mm, (14)

L \u003d 1.5 + 1700 \u003d 1701,5 mm

, (15)

Let's take: s \u003d 0.425 m;

K \u003d 1.4;

i \u003d 1.

Min.

t pc \u003d T O + T Wu + T VP + T ODM, Min, (16)

where T O. - the main time, min;

t Wu.

t VP - auxiliary time associated with the transition, min.

Let's take: T Wu \u003d 0.25 min;

t VP \u003d 0.25 min.

Min, (17)

Min, (18)

Min

Min.

2.8.7 Turning-screw

1) install the item in the leashed cartridge;

2) cut off the worn thread;

3) Remove the item.

Determining the size of the cutting of the cutter and the output of the instrument:

Y \u003d in 1 + in 2 + y 3, mm, (55)

where in 1. - the magnitude of the cutting cutter, mm;

U 2. - a cutter (2 - 3 mm);

U 3. -Bring of test chips (2 - 3 mm).

We determine the cutting size of the cutter:

Mm, (56)

where T. \u003d 0.2 mm - cutting depth;

φ the main corner of the cutter in the plan (φ \u003d 45 º).

Mm,

y \u003d 0.2 + 3 + 3 \u003d 6.2 mm.

Determination of cutting speed:

Mm / Oh, (57)

where with V, x v, y v - coefficients depending on the working conditions;

K - correction coefficient characterizing specific

Working conditions;

S. - Cutter supply (0.35 - 0.7 mm / O, L-1 p. 244 tab.IV 3.52);

On the machine acceptS \u003d 0.5 mm / O;

With V. \u003d 141 (L-1 page 345 tab.IV 3.54);

x V. \u003d 0.18 (L-1 page 345 tab.IV 3.54);

g V. \u003d 0.35 (L-1 page 345 tab.IV 3.54);

K \u003d 1.60 (L-1 page 345 tab.IV 3.54).

mm / about.

Determine the number of revolutions:

Rpm, (58)

where D. - diameter of the treated surface, mm.

Rpm.

Determination of the main time on the cervix:

Min, (59)

where L. \u003d 18 mm, length of the treated surface;

Y - the amount of cutter cutter, mm;

n. - the number of revolutions;

S. \u003d 0.35 - 0.7 mm / about the feed of the cutter (L-1 page 244 tab.IV 3.52);

On the machine acceptS \u003d 0.5 mm / about.

We accept the passport nearn \u003d 500 rpm.

Min.

Piece definition:

t PC \u003d T O + T Wu + T VP + T OGM, Min, (60)

where T O. - the main time, min;

t Wu. - auxiliary time on the installation and removal of the part, min;

t VP - auxiliary time associated with the transition, min;

t Wu IV 3.57);

t VP \u003d 0.25 min (L-1 page 347 tab.IV 3.57).

Min, (61)

Min, (62)

Min

Min.

2.9 Determination of piece - Calculation Time

Min, (92)

where T pcs - piece time, min;

T pp - preparatory and final time, min;

Z. - Number of parts in the party.

Determine the size of parts in the party:

ΣT PZ.

Z \u003d, (93)

Σ t pcs · to

where σt PZ. - Total preparatory and final time on all

Operations, min;

Σ T pcs - total piece time for all operations, min;

K is a seriality coefficient, 0.05.

2.10 Operating card

Table 5.

	tool		t Opera min.		m / min	about	t O. min.	rpm	t B. min.
		Working	t Opera min.		m / min	about	t O. min.	rpm	t B. min.	measuring

Application 2. Remove the peaks of the cam 3. Remove the detail	Grinding wheel	Calipers			3,71	65,64	54,26		0,22
Grinding 2. Grind Kulachka 3. Remove the detail	Grinding wheel	Skoby			4,95	105,09	10,67		0,25 0,25
Polishing 1. Install the item in a leashed cartridge. 2. Polish the item. 3. Remove the item.	Abrasive ribbon	Skoby			0,49	104,03	0,53		0,25 0,25
Grinding 1. Install the item in a leashed cartridge 2. Grind cervix 3. Remove the detail	Grinding wheel	Skoby			14,48	85,40	13,53		0,25 0,25
Application 1. Install the detail on the neck under the distribution gear and the gear for the thread 2. Remove Shaki 3. Remove the detail	_____	Calipers			3,71	21,88	56,26		0,22
Grinding for repair size 1. Install the item in a leashed cartridge 2. Grind 4 cervical sizes 3. Remove the detail	Grinding wheel	Skoby		6,897	4,02	23,09	1,73		0,25 0,25

Continued Table 5.


Tokar 1. Install the item in a leashed cartridge 2. Cut the worn thread 3. Remove the detail	Stroke	Calipers		38,076	505,25		0,25 0,25
Application 1. Install the item in the fixture for fastening the support necks 2. Remove the neck for the thread 3. Remove the detail	______	Calipers		3,71	50,71	56,26	0,22
Tokar 1. Install the item in a leashed cartridge 2. Soak the neck and cut the thread 3. Remove the detail	Passing straight cutter with a record	Calipers		41,846	555,28		0,25 0,25
Milling 1. Install the item in the bracket or jack 2. Milling Lysk. 3. Remove the detail	Cylindrical cutter	Calipers			12,7	0,57	0,25 0,25
Plumbing 1. Install the item in vice 2. Run thread 3. Remove the detail	Plate	Threaded Ring	0,014

3 Design part

3.1 Description of the device and workabout soblock

The device is intended for the jamming of the ZMZ engine distribution shaft - 402.10

The cartridge is a leashed duchquula. Patron consists of a disc 8 attached to the spindle floss, a floating slider 7, two cams 2, sitting on the fingers 4 pressed in the holes of the floating slider, rings 12 and 18, balls 13, sleeves 15, springs 1 and 17 , Planks 24, protecting the slider from falling out, covers 10, casing 11, lock 26 and other fasteners.

To install the treated shaft to the center, you must turn the casing 11 counterclockwise until the clamp is hit 26 in the groove of the ring 18. At the same time

It is reached with turning cam 2 in the extreme position at which the shaft is installed.

When the machine is turned on, the latch 26 leaves the groove of the ring 18, and at this time under the action of the spring 1 there is a turn clockwise of the cover 11 and with it the lids 10, ring 12 and cams 2, which are pressed against the parts being processed. Under the action of cutting forces, the detail of the friction force captures the cams pressed to its surface. With increasing torque, the clamping force automatically increases.

To fasten the shafts with a diameter of 20 to 160 mm, four sets are used.

The cartridge of this design is successfully used on the machine-building plants of Czechoslovakia.

Conclusion

Performing a course project, I learned to choose rational ways to eliminate defects.

Methods and methods that I applied in the calculations are not time-consuming and have a low cost, which has an important role for the economy of the auto repair enterprise.

These defects can be restored in small enterprises, where there is a turning, grinding and galvanic workshop, and there are also necessary specialists.

I also learned to use the literature, choose certain forms to calculate cutting regimes and time standards.

I learned the device and the work of the device, got acquainted with the brief description of the equipment, learned to choose it to eliminate defects.

And I learned how to develop the schemes of the technological process, to draw up a plan for technological operations with the selection of necessary equipment, devices, tools.

Bibliography

1 Alexandrov V.A. "Certificate of Normizer" M.: Transport, 1997 - 450c.

2 Vanchukievich V.D. "Certificate of Grinding" M.: Transport, 1982 - 480s.

3 Karagodin V.I. "Repair of cars and engines" M.: "Mastery", 2001 - 496s.

4 Klebanov B.V., Kuzmin V.G., Maslov V.I. "Car repair" M.: Transport, 1974 - 328C.

5 Malyshev G.A. "Certificate of Technologist of Author Repair Production" M.: Transport, 1997 - 432c.

6 Molodhin V.P. "Handbook of the Young Tokary" M.: Moscow Worker, 1978 - 160s.

7 "Methodical instructions on course design" 2 part. Gorky 1988 - 120s.

Constructive and technological characteristics of the part

The automotive engine camshaft is one of the responsible parts. From the state of the main working surfaces of the shaft is determined by the operation of the engine as a whole. The main defects of the engine camshafts are:

1. Wear of the support necks camshaft;

2. Wearing cams in height;

3. Changing the cam profile;

4. Figing the shaft.

All listed camshaft defects cause knocks in the valve mechanism, a reduction in engine power, and an increase in gaps in bearings causes, in addition, the oil pressure drop in the lubrication system. The operation of the clappan-distribution mechanism is theoretically estimated by the parameter called the "section time" and is characterized by an area bounded by a valve lifting height in time.

Fig. 5 shows curves of changes in the area of \u200b\u200bthe valve-distribution mechanism. Shaded zones: Lower characterizes a decrease in the area as a result of a fist of the profile.

The decrease in the "time section" of the valve as a result of the wear of these conjugated parts leads to a decrease in the time of filling cylinders and the power drop in the engine.

Fig. five. Changes in the area "time-section" when wear

valve distribution mechanism

Recovery to normal size lifting height is carried out by filling the cam over the entire profile and is justified by the fact that, if you remove the layer of metal with the same (with respect to the intense cam) from the cam, then the valve lifting value and the opening times and closing the valve does not change. It will only be necessary to bring the gap between the valve and the pusher to normal value (Fig. 6).

Fig. 6. Camshaft cam pulp under repair size

with a profile preservation

Design sizes and technical conditions for the manufacture and repair of the distribution shaft of the car ZIL-130 are shown in ad. 3.

Purpose of work:

1. To study the possible types of camshaft defects on those. conditions on monitoring and establishing existing defects on a controlled shaft;

2. To explore the nature and wear of the camshaft camshaft;

3. Purchase skills to use special devices and tools for measuring the cam cam.

1. External inspection of camshaft;

2. Memo all the cam 2 belts with the definition of wear of cams in height;

3. Determination of camshaft deflection;

4. Measurement of the cords of the camshaft;

5. Building a single cam profile.

Equipment, appliances, tools:

1. workbench for the installation of camshaft;

2. Device for measuring cam elements;

3. Tools:

a) micrometers 25-50, 50-75 mm;

b) the indicator with a resistant accuracy of 0.01 mm;

c) Scheber trianglass.

4.The. Conditions to control-sorting parts under major repairs.

Objects of research

Engine camshafts: GAZ-51, ZIL-130, M-21, YAMZ-236 (YAMZ-238), etc.

The procedure for performing work:

1. External inspection of camshaft and inspection results are recorded in the report form.

2. The following shaft defects are set by an outdoor inspection:

a) leaks on cervix, gear and cams;

b) cracks of different size and location;

c) local deposits, bulbs and risks;

d) disruption and threading accuracy, depreciation damage to a sponge groove, etc.

Measurements are set:

a) wear of support necks;

b) wear cams in height;

c) Dogib Vala.

3. Conduct the measuring instrument.

4. Perform measurements in the amount provided for by this manual.

5. According to the results of the outdoor inspection and measurements of the camshaft in accordance with those. Conditions for control-sorting include one of the 3 categories: a) suitable, b) are not suitable, c) require repair.

6. Results of measurement to put in the report form and build the pusher lift curve on a new and changed cam.

7. Place a report by making an opinion on work.

8. Rent a workplace with a laboratory assistant.

Determination of the repair sized camshaft neck

Repair size: d p \u003d d z - z,

where D R is the nearest desired renovation size of the shaft shaft, mm;

D z - measured shaft diameter, mm;

Z - Package for processing (for diameter).

Putting on grinding

where Z  is the allowance that takes into account the non-uniformity of the wear of the neck, Z  \u003d 0.06 mm;

f - the deflection of a shaft that is not amenable (allowed by one, f \u003d 0.05 mm;

Z h - allowance, taking into account the depth of rice on the neck (the depth of the damaged layer z h \u003d 0.08 mm);

 B - the error of the basing and fixing the shaft during grinding ( B \u003d 0.02 mm).

Guidelines for the performance of work:

1. Determination of wear of support necks.

To determine the wear of the baseline of the shaft, each shaft must be measured in 2 planes 1 - 1 (1st belt) and 2 - 2 (2nd belt), which are 5 mm from the edges of the supporting neck (Fig. 2.7).

In each belt, the support necks are measured in 2 mutually perpendicular planes of A - A, parallel to the plane of the keypad and the plane B - V, perpendicular to the plane passing through the keyway.

When measuring the neck, the camshaft must be installed on prisms or in centers.

2. Determine the wear of cams in height.

To determine wear with a cam in height, it is necessary:

a) each cam measurement in 2 planes (Fig. 7);

b) compare the results of the height measurements with the nominal height of the new cam and determine the wear of the cams in height.

c) to conclusion about the possibility of further work camshaft camshafts without repair, based on the permissible wear value by those. Conditions or assign a method for restoring cams to a nominal value.

Fig. 7. Scheme of measuring camshaft camshafts

Definition of the shaft deflection.

To determine the deflection of the shaft camshaft installed in the center:

a) to the middle neck (with a symmetrical arrangement of the shaft) alternately tested the measuring rod of the indicator head;

b) Install the Rod of the indicator head to the position in which the small arrow gives a deviation 1 - 2 mm and bring the null of the movable scale to the large arrow,

c) to refer to the camshaft camshaft to be measured relative to the measuring device,

d) set the cam to the maximum lifting position, which is determined by a small point of the arrow when the cam shaft turns,

e) turn the shaft into any side by 90 and the indicator arrow to set to zero,

e) Rotating shaft, fix the height of the cam lift according to the indicator, after every 10  angle of rotation. The maximum lifting cam must match the angle of rotation 90 from the beginning of the reference,

g) According to measurements and tabular data (for a new cam, see the poster) to build the lift curves (new and modified).

Reference data are presented in Appendix 2.

Control questions

List the main design elements of the camshaft and its defects?

What parameters characterize the state of the supporting neck and camshaft camshafts?

How to determine the greatest cervical size on which the category of repair size is assigned?

How to check the camshaft on the deflection?

What sequence is the micrometer on "0" is installed?

How to check the camshaft cake profile?

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