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Compressor crankshaft manufacturing method

A compressor crankshaft and crankshaft technology, applied in the field of compressors, can solve the problems of reducing the contact area, setting aside more excess, low production efficiency, etc., and achieving the effects of avoiding high rejection rate, avoiding complex processes, and high production efficiency

Inactive Publication Date: 2018-10-09
CHAOHU NANTE PRECISION MFG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The crankshaft is the key component of the rotary air conditioner compressor, so it has high performance requirements. In order to further improve the efficiency of the compressor, compressor manufacturers adopt the method of reducing the diameter of the crankshaft and the contact area to improve efficiency, but its wear resistance Significantly reduced, unable to meet the needs of reliability, so that the method of reducing the diameter of the crankshaft is limited
At present, the compressor manufacturing industry generally adopts two processes for the surface treatment of the crankshaft: 1. Phosphating treatment on the surface of the crankshaft: the phosphating film after phosphating treatment is generally 1-3um, and the film-base bonding force is low, so it is easy to fall off , and the friction coefficient is high, the wear resistance is poor, and the film thickness deviation is large, about 0.5-1um. In use, it cannot meet the demand, and the substances used in phosphating treatment cannot be discharged directly, which is harmful to the environment. ;2. After phosphating treatment, spray MOS2 coating: the thickness of the film is 1-3um, the film-base bonding force is not improved compared with phosphating, but the friction coefficient is reduced; MoS2 coating begins to oxidize at 300 ° C, and In a humid environment, it is easy to fail. Therefore, compared with the phosphating property, the efficiency of the compressor has been improved to a certain extent, but it still cannot meet the demand
In the Chinese invention patent CN102628154A, a wear-resistant compressor crankshaft and its preparation method are proposed. Although the invention improves the wear resistance of the crankshaft, the process from mold manufacturing to specific production is very complicated. The generation of slag inclusion defects has a high scrap rate, and at the same time, it is necessary to leave a large margin for the manufacture of the blank, and then process it through multiple processes, the material utilization rate is low, the processing process is complicated, and the production efficiency is low. Therefore, we propose a compressor crankshaft preparation method

Method used

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preparation example Construction

[0017] The invention provides a technical solution: a method for preparing a compressor crankshaft, comprising the following steps:

[0018] (1) Cutting and peeling: use refined No. 45 steel, the chemical composition and mechanical properties meet the requirements of GB699 and GB3077, and require Mo<0.1% and pass the hot forging test. The material after feeding is peeled;

[0019] (2) Heating and forging: Heating with a walking gas heating furnace, and then forging, the forging process is divided into two steps: pre-forging and final forging;

[0020] (3) Trimming and twisting: the forging after final forging is trimmed on the crank press, and the crankshaft is twisted on the twisting machine after trimming;

[0021] (4) Correction treatment: The crankshaft after turning is corrected twice, and the correction equipment is a hydraulic correction machine. After the first correction, it is rotated 90° for the second correction, and the temperature of the correction is kept at ab...

Embodiment 1

[0025] Firstly, the refined No. 45 steel is selected, the chemical composition and mechanical properties meet the requirements of GB699 and GB3077, and Mo < 0.1% is required, and the hot forging test is carried out. The material is cut by sawing, and the material after cutting is peeled; Then it is heated by a walking gas heating furnace, and then forged. The forging process is divided into two steps: pre-forging and final forging. Twist the crank; the crankshaft after the turn is corrected twice, and the calibration equipment is a hydraulic correction machine. After the first correction, it is rotated 90° for the second correction, and the temperature of the correction is kept at about 850°C; the corrected crankshaft needs to be heat treated. The crankshaft of refined 45 steel requires normalizing treatment. The hardness of the crankshaft after heat treatment is HB180-228, and the grain size is 5-8. The crankshaft after heat treatment needs to be inspected. The hardness shall...

Embodiment 2

[0027] In embodiment one, add following operation:

[0028] The initial forging temperature in the step (2) is 1170-1200°C; the temperature of the crankshaft in the step (2) is 950-1050°C.

[0029] Firstly, the refined No. 45 steel is selected, the chemical composition and mechanical properties meet the requirements of GB699 and GB3077, and Mo < 0.1% is required, and the hot forging test is carried out. The material is cut by sawing, and the material after cutting is peeled; Then use a walking gas heating furnace to heat, in which the initial forging temperature is 1170-1200 ℃, and then forging, the forging process is divided into two steps: pre-forging and final forging; the forging after final forging is trimmed on the crank press , after trimming the crankshaft, twist it on the twisting machine, wherein the temperature of the crankshaft twisting is 950-1050°C; the crankshaft after turning is corrected twice, and the correction equipment is a hydraulic correction machine. Af...

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Abstract

The invention discloses a compressor crankshaft manufacturing method. The compressor crankshaft manufacturing method comprises the following steps that blanking and peeling are conducted, specifically, refined 45 steel is selected, the chemical components and mechanical properties meet regulations of GB699 and GB3077, Mo is required to be smaller than 0.1%, a hot upset test is carried out, blanking is conducted through a saw cutting method, and the material subjected to blanking is peeled; and heating and forging are conducted, specifically, heating is conducted through a stepping gas heatingfurnace, then, forging is conducted, and the forting procedure is divided into the pre-forging step and the finish forging step. The compressor crankshaft manufacturing method has the advantage of being high in production efficiency, a complet automatic forging production line can be formed, the complex technology and high rejection rate problems are avoided, and the problems that according to anexisting crankshaft production technology, the processes from die manufacturing to specific production are complex, moreover, due to the fact that pores in products and the slag inclusion defect occur, the rejection rate is high, meanwhile, a lot of allowances need to be reserved during blank manufacturing, machining is conducted through multiple procedures, the material utilization rate is low, the machining procedures are complex, and the production efficiency is low are solved.

Description

technical field [0001] The invention relates to the technical field of compressors, in particular to a method for preparing a crankshaft of a compressor. Background technique [0002] The crankshaft is the key component of the rotary air conditioner compressor, so it has high performance requirements. In order to further improve the efficiency of the compressor, compressor manufacturers adopt the method of reducing the diameter of the crankshaft and the contact area to improve efficiency, but its wear resistance Significantly reduced, unable to meet the needs of reliability, so that the method of reducing the diameter of the crankshaft is limited. At present, the compressor manufacturing industry generally adopts two processes for the surface treatment of the crankshaft: 1. Phosphating treatment on the surface of the crankshaft: the phosphating film after phosphating treatment is generally 1-3um, and the film-base bonding force is low, so it is easy to fall off , and the fr...

Claims

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Application Information

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IPC IPC(8): B23P15/00
Inventor 陈盛远王胜陈勇孙海峰贾飞
Owner CHAOHU NANTE PRECISION MFG
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