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High-modulus straight-tooth cylindrical gear cold extrusion technology and special die thereof

A spur gear and cold extrusion technology, which is applied to metal extrusion dies and other directions, can solve the problems of tooth shape influence, low material utilization rate, etc., and achieve the effects of cost reduction, energy consumption reduction, and simple process steps.

Inactive Publication Date: 2013-05-22
TAICANG JIUXIN PRECISION MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diameter of the shunt hole or shunt shaft in this process has a great influence on the tooth formation, and the material utilization rate is not high

Method used

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  • High-modulus straight-tooth cylindrical gear cold extrusion technology and special die thereof
  • High-modulus straight-tooth cylindrical gear cold extrusion technology and special die thereof
  • High-modulus straight-tooth cylindrical gear cold extrusion technology and special die thereof

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Embodiment 1

[0028] Such as figure 1 , figure 2 As shown, the spur gear produced by the present invention has a modulus greater than or equal to 4, and the central hole

[0029] A certain margin is reserved for subsequent machining, and the tooth profile accuracy is required to reach DIN 9 level and above.

[0030] The cold extrusion process of large modulus spur gears provided in this embodiment mainly includes the following steps:

[0031] (1) Carry out blanking, 750°C annealing, shot blasting, phosphating and lubricating treatment on the billet in sequence;

[0032] (2) Shaping treatment, control the verticality tolerance between the end surface and the axis within 0.10mm, and control the parallelism tolerance between the two end surfaces within 0.05mm;

[0033] (3) Reverse extrusion deep hole treatment, control the size tolerance of the deep hole within ±0.10mm;

[0034] (4) The bottom punching process is formed into a hollow blank, and the thickness of the continuous skin is cont...

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Abstract

The invention discloses a high-modulus straight-tooth cylindrical gear cold extrusion technology which comprises the following steps of: shearing or sawing a blank and charging the blank; shaping the blank; and performing counter-extrusion deep hole treatment and bottom impact treatment to form a hollow blank, then performing pre-forming cold extrusion tooth treatment and fine-forming cold extrusion tooth treatment, and performing an isothermal normalization or annealing technology and lubrication treatment between the two working procedures. In the prior art, the type of gear processed by the conventional forming technology needs to be ground, polished or lapped to reach the precision requirement. Compared with the prior art, the high-modulus straight-tooth cylindrical gear cold extrusion technology has the advantages that a straight-tooth cylindrical gear processed by the technology has high tooth-shaped precision and the tooth-direction precision reaching the level 9 to 10, and the tooth surface does not need subsequent processing. The working procedures of the technology are simple, the efficiency is high and heating is not needed, so that the energy consumption is greatly reduced; the die can be used for more than 100 thousand of times; and the cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of cold forging and precision forming, and relates to a gear cold extrusion process, in particular to a large modulus spur gear cold extrusion process and a special mold thereof. Background technique [0002] In the prior art, there are mainly three traditional forging forming processes for large modulus spur gears: (1) Upsetting extrusion forming process, which means that under the action of the axial force of the punch, the metal blank is subjected to upsetting pressure in the concave mold cavity Upsetting deformation occurs, and the metal flows to the surroundings in the radial direction, gradually filling the tooth-shaped cavity. The forming load of this process is extremely large, and the corners of the upper and lower end faces are difficult to fill, microcracks are prone to occur on the tooth root part, and the die life is low; (2) Forward extrusion forming process refers to that under the action of e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/20B21C25/02
Inventor 章立预马霄峰郑英俊
Owner TAICANG JIUXIN PRECISION MOLD
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