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Method for processing crankshaft capable of improving torques of winch and crank-pin

A crankshaft processing and crankpin technology, which is used in manufacturing tools, metal material coating processes, furnaces, etc., can solve the problems of high-speed vibration bolts and washers that are easy to loosen and fall off, occupy a large space, and increase weight, and achieve guaranteed accuracy and relative limits. The effect of increasing torque and friction force and improving the pass rate

Active Publication Date: 2009-05-20
浙江长宏科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has the advantages of high installation accuracy, long service life, and convenient maintenance, it is not suitable for general small size due to the disadvantages of complex structure due to the addition of fastening bolts and stop pads, easy loosening of bolt washers due to high-speed vibration, large space occupation, and increased weight. Requirements for gasoline engines with high speed, light weight, simple and compact structure, etc.

Method used

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  • Method for processing crankshaft capable of improving torques of winch and crank-pin
  • Method for processing crankshaft capable of improving torques of winch and crank-pin
  • Method for processing crankshaft capable of improving torques of winch and crank-pin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Select 20CrMo alloy structural steel material, and process it into crank pin 3 semi-finished products on an ordinary lathe to make the dimensional tolerance meet the technical requirements of crank pin 3 semi-finished products, and then carry out carburizing and quenching treatment on crank pin 3 semi-finished products; carburizing in heat treatment mesh belt furnace and heated to 860°C. The hardness of crank pin 3 semi-finished products after quenching is shown in Table 2. The quenched crank pin 3 semi-finished products are finely ground by cylindrical grinder and honing machine, and crank pin 3 semi-finished products are finely ground. The roughness is shown in Table 3.

[0034] After quenching and fine grinding, the semi-finished crank pin 3 is subjected to medium-temperature water washing, degreasing, water washing, pickling, water washing and other pre-blackening treatments. Then carry out blackening treatment. Wherein the concrete method of blackening treatment i...

Embodiment 2

[0037]Select GCr15 bearing steel material, process it into semi-finished products of crank pin 3 on an ordinary lathe, make its dimensional tolerance meet the technical requirements of semi-finished crank pin 3, and then quench the semi-finished crank pin 3; quenching is carried out in a heat treatment mesh belt furnace, adding When the temperature reaches 860°C, the hardness of the crank pin 3 semi-finished product after quenching is shown in Table 2. The crank pin 3 semi-finished product after quenching is finely ground by cylindrical grinder and honing machine, and the roughness of the crank pin 3 semi-finished product after fine grinding is shown in the table 3.

[0038] After quenching and fine grinding, the semi-finished crank pin 3 is subjected to medium-temperature water washing, degreasing, water washing, pickling, water washing and other pre-blackening treatments. Then carry out blackening treatment. Wherein the specific method of blackening treatment is: the semi-f...

Embodiment 3

[0042] Select GCr15 bearing steel material, process it into semi-finished products of crank pin 3 on an ordinary lathe, make its dimensional tolerance meet the technical requirements of semi-finished crank pin 3, and then quench the semi-finished crank pin 3; quenching is carried out in a heat treatment mesh belt furnace, adding When the temperature reaches 870°C, the hardness of the crank pin 3 semi-finished product after quenching is shown in Table 2. The quenched crank pin 3 semi-finished product is finely ground by cylindrical grinder and honing machine, and the roughness of the crank pin 3 semi-finished product after fine grinding is shown in the table 3.

[0043] After quenching and fine grinding, the semi-finished crank pin 3 is subjected to medium-temperature water washing, degreasing, water washing, pickling, water washing and other pre-blackening treatments. Then carry out blackening treatment. Wherein the concrete method of blackening treatment is: immerse crank pi...

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Abstract

The invention provides a crankshaft machining method capable of improving the torque of a crank and a crank pin, which belongs to the technical field of machining and solves the problems of complex structure, easy loosening and falling of bolt washers due to high-speed vibration, large floor space, heavy weight, etc. of the prior crankshaft of a gasoline engine. The crankshaft machining method capable of improving the torque of the crank and the crank pin comprises the following steps: A. processing of a crank pin semiproduct; B. blackening; and C. press mounting. The machining method has a few simple and easily controlled steps and strong maneuverability, improves the qualified rate, and can effectively guarantee the precision and the relative ultimate torque of the crankshaft of the gasoline engine after press mounting.

Description

technical field [0001] The invention relates to a general-purpose small gasoline engine crankshaft processing method, in particular to a crankshaft processing method capable of increasing the torque between components, and belongs to the technical field of mechanical processing. Background technique [0002] The difference between the general-purpose small gasoline engine crankshaft and the large-scale internal combustion engine crankshaft is that: the large-scale internal-combustion engine crankshaft is generally forged or cast as a whole for the crankshaft and the crank pin, and the relative limit torque between the crankshaft and the crank pin is affected by the strength of the material itself; while the general-purpose small gasoline engine crankshaft It consists of a left crank, a right crank, a crank pin, a connecting rod and a needle roller bearing that are made of steel and are statically fitted and press-fitted. The two ends of the crank pin are respectively connecte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C21D9/30C21D1/18C23C8/42
Inventor 韩明玉
Owner 浙江长宏科技股份有限公司