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Cold forging precise forming process for mechanical transmission gear shaft

A mechanical transmission and precision forming technology, applied in the direction of mechanical equipment, engine components, etc., can solve the problems of complex processing and high production cost, and achieve the effect of simple processing method, good consistency and high strength

Inactive Publication Date: 2012-05-23
江苏威鹰机械有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The production process is complicated and the production cost is high

Method used

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  • Cold forging precise forming process for mechanical transmission gear shaft
  • Cold forging precise forming process for mechanical transmission gear shaft

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Embodiment 1

[0021] Embodiment 1: A cold forging precision forming process of a mechanical transmission gear shaft, comprising the following steps:

[0022] a. Blanking, intercepting the bar, blanking the alloy steel bar with a circular saw machine according to the length of the gear shaft, the weight error of the blank is ±1 gram;

[0023] b, annealing, annealing the bar, the annealing temperature is 860°C, keep it warm for 6 hours, and cool it to 300°C with the furnace;

[0024] c. Shot blasting, phosphating, and saponification treatment. Phosphate and saponify the annealed bar according to the conventional process by using the phosphorus saponification line to form a surface lubricating layer. The phosphating temperature is 70°C and the time is 20 minutes; saponification The temperature is 60°C, and the time is 10 minutes;

[0025] d. Reduced diameter extrusion: use a 400T mechanical press, four-column universal formwork and a positive extrusion die, and positively extrude one end of t...

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PUM

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Abstract

The invention discloses a cold forging precise forming process for a mechanical transmission gear shaft. The process comprises the following steps of: blanking, annealing, performing shot blasting, phosphatizing, saponifying, performing reducing extrusion, performing upsetting extrusion, performing small-end reducing extrusion, and reversely extruding an inner bore. By the process, blanks are processed by a cold forging precise forming mold and are machined to form finished products, so that the process has a simple production process flow, toothed holes in the wall of the inner bore at a large end have high intensity and high consistency, an outer wall is convenient to hob after a small end is subjected to reducing extrusion, and the process is suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of cold forging precision forming technology, and relates to a cold forging process of a gear shaft, in particular to a cold forging precision forming process of a gear shaft of a starter motor decelerating machine. Background technique [0002] The mechanical transmission gear shaft is the mechanical part used to transmit motion and torque in the one-way gear assembly, specifically the reduction shaft on the starter motor. The shape of the gear shaft is composed of a big end and a small end, and the big end has a rectangular inner hole and a tooth-shaped blind hole. The traditional processing method is that the shape and the inner square hole are formed by cutting or forging, and the tooth-shaped blind hole is deformed due to back extrusion. Extremely low, greatly exceeding the limit deformation allowed by cold forging. The unit extrusion force of the die is up to 400Kg / mm2, which is also much higher than t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/06
Inventor 张太良万永福张扣宝黄恒桃吴志存
Owner 江苏威鹰机械有限公司
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