High-precision high-hardness low-cost crankshaft machining process

A technology of crankshaft processing and high hardness, which is applied in the field of crankshaft processing, can solve the problems of high operating proficiency requirements for staff, reduced crankshaft fatigue strength, and crankshaft surface damage, etc., to achieve easy use, high hardness and wear resistance, Dust reduction effect

Inactive Publication Date: 2018-10-09
四川省宜宾普什汽车零部件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the cranks are on different planes and the stiffness of the crankshaft is different along the length direction, the largest pressure correction deformation does not necessarily occur in the direction of the applied pressure, but often occurs in the journal circle of the dangerous end face. Corner, resulting in stress concentration, reducing the fatigue strength of the crankshaft
Surface knocking straightening is to straighten the surface of the crankshaft by knocking on the surface of the crankshaft with tools such as hand hammers, air hammers, chisels, and flat shovels. It is easy to cause damage to the surface of the crankshaft, and cracks often appear

Method used

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  • High-precision high-hardness low-cost crankshaft machining process
  • High-precision high-hardness low-cost crankshaft machining process
  • High-precision high-hardness low-cost crankshaft machining process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Forged crankshaft blank;

[0036] (2) Carry out fine and rough turning processing on the crankshaft embryo body;

[0037] (3) Grinding the crankshaft with a grinding wheel;

[0038] (4) Aligning the crankshaft, including the following steps:

[0039] The main journal diameter of the crankshaft is 220mm, and the allowable value of runout is <0.06mm.

[0040] A. Place the two ends of the crankshaft to be straightened on the bracket so that the crankshaft can rotate, and keep the front and rear shafts of the crankshaft horizontal;

[0041] B. While turning the crankshaft, measure the radial runout of each main journal with a dial indicator; record the data, and mark the position with the largest deformation; the results are as follows:

[0042] Main journal number

a

b

c

d

e

f

g

allowance

Runout mm

0.03

0.03

0.02

0.05

0.12

0.23

0.18

＜0.06

[0043] Then adjust the position with the largest amount of ...

Embodiment 2

[0064] (1) Forged crankshaft blank;

[0065] (2) Carry out fine and rough turning processing on the crankshaft embryo body;

[0066] (3) Grinding the crankshaft with a grinding wheel;

[0067] (4) Aligning the crankshaft, including the following steps:

[0068] The main journal diameter of the crankshaft is 220mm, and the allowable value of runout is <0.06mm.

[0069] A. Place the two ends of the crankshaft to be straightened on the bracket so that the crankshaft can rotate, and keep the front and rear shafts of the crankshaft horizontal;

[0070] B. While turning the crankshaft, measure the radial runout of each main journal with a dial indicator; record the data, and mark the position with the largest deformation; the results are as follows:

[0071] Main journal number

a

b

c

d

e

f

g

allowance

Runout mm

0.13

0.14

0.13

0.03

0.02

0.01

0.01

＜0.06

[0072] Then adjust the position with the largest amount o...

Embodiment 3

[0093] (1) Forged crankshaft blank;

[0094] (2) Carry out fine and rough turning processing on the crankshaft embryo body;

[0095] (3) Grinding the crankshaft with a grinding wheel;

[0096] (4) Aligning the crankshaft, including the following steps:

[0097] The main journal diameter of the crankshaft is 220mm, and the allowable value of runout is <0.06mm.

[0098] A. Place the two ends of the crankshaft to be straightened on the bracket so that the crankshaft can rotate, and keep the front and rear shafts of the crankshaft horizontal;

[0099] B. While turning the crankshaft, measure the radial runout of each main journal with a dial indicator; record the data, and mark the position with the largest deformation; the results are as follows:

[0100] Main journal number

a

b

c

d

e

f

g

allowance

Runout mm

0.14

0.18

0.13

0.03

0.02

0.01

0.01

＜0.06

[0101] Then adjust the position with the largest amount o...

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Abstract

The invention provides a high-precision high-hardness low-cost crankshaft machining process, and relates to the technical field of crankshaft machining. According to the technical scheme, the method comprises the following steps that (1) a crankshaft blank is forged; (2) fine turning and rough turning are carried out on the crankshaft blank; (3) a crankshaft is polished through a grinding wheel; (4) the crankshaft is straightened; and (5) heat treatment is carried out on a connecting rod journal of the crankshaft through a quenching device. The high-precision high-hardness low-cost crankshaftmachining process is very convenient to master and can avoid the damage to the crankshaft.

Description

technical field [0001] The invention relates to the technical field of crankshaft processing, in particular to a high-precision, high-hardness and low-cost crankshaft processing technology. Background technique [0002] The crankshaft is the main rotating part of the engine. After the connecting rod is installed, it can undertake the up and down movement of the connecting rod and turn it into a circular motion. It is an important part of the engine, and its material is made of carbon structural steel or ductile iron, including: main journal, connecting rod journal, etc. The crankshaft processing process mainly includes: blank forging, crankshaft machining, crankshaft straightening, crankshaft heat treatment, etc. [0003] The machining of the crankshaft in the prior art mainly includes turning and grinding of the main journal and the connecting rod journal; in the process of grinding the main journal and the connecting rod journal, there is no effective control of the tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24D5/00B24D5/16B24B5/42B21D3/16B21C51/00B23P15/00
Inventor 张强周毅涛沈楠
Owner 四川省宜宾普什汽车零部件有限公司
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