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A Tooth Profile Correction Method for Cold Extrusion Dies

A technology of cold extrusion and tooth shape, which is applied in the field of machinery, can solve problems such as tooth structure deviation, tooth structure deviation, and unstable product quality, and achieve the effects of reducing deformation and improving processing accuracy

Active Publication Date: 2019-07-23
YUHUAN PUTIAN UNIDIRECTIONAL DEVICE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, during the cold extrusion molding process of tooth-shaped parts, the mold will be subjected to extrusion force to cause elastic deformation during the molding process, and because the wear rate of the part with a large curvature in the mold is greater than that of the part with a small curvature during the extrusion process, resulting in As the service time increases, the processed tooth structure will also deviate
Affected by the elastic deformation, wear and heat treatment of the mold, there is a certain shape deviation between the tooth structure processed by cold extrusion and the design requirements, and the tooth structure processed after long-term use has further shape deviation, resulting in the processed Unstable product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The cold extrusion die includes a die with a tooth-shaped cavity. During the cold extrusion process, the material enters the tooth-shaped cavity of the die and undergoes plastic deformation under the action of the extrusion force of the punch, so that the tooth-shaped cavity A tooth-shaped structure is formed in the cavity. In order to overcome the elastic deformation of the mold during the cold extrusion molding process of the parts with the tooth structure, the wear after long-term use and the influence of the heat treatment of the parts on the processing accuracy, the tooth shape in the tooth cavity of the cold extrusion mold is carried out. fix.

[0024] The tooth profile correction method of this cold extrusion die, concrete steps are as follows:

[0025] Step a, according to the design requirements, list the parameters of the theoretical tooth shape;

[0026] Step b, modifying the parameters of the theoretical tooth profile to obtain the parameters of the actual...

Embodiment 2

[0043] Taking the standard gear with modulus m=0.5 as an example, the pressure angle correction parameter of the die tooth shape die of the cold extrusion die is Δα=0.3°, and the correction value of the addendum circle diameter Δd a =0.015mm, correction value of dedendum circle diameter Δd f = 0.005mm.

Embodiment 3

[0045] Taking the standard gear with modulus m=2 as an example, the pressure angle correction parameter of the tooth shape die of the cold extrusion die is Δα=0.48°, and the correction value of the addendum circle diameter Δd a =0.016mm, correction value of dedendum circle diameter Δd f = 0.006mm.

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Abstract

The invention provides a tooth shape correction method of a cold extrusion mold, belongs to the technical field of machinery, and solves the problem of low precision during the cold extrusion processing of parts with tooth-shaped structures. The tooth shape correction method of the cold extrusion mold has the following concrete steps that step a, listing the theoretical tooth shape parameters according to the design requirements; step b, correcting the theoretical tooth shape parameters to obtain the parameters of the practically processed tooth shape; step b-1, correcting the pressure angle of the theoretical tooth shape; step b-2, correcting the shape of the theoretical tooth shape; step b-3, correcting the theoretical tooth shape; step b-3, drawing the practically processed tooth shape; step c, performing pretreatment on materials of a female mold; step d, performing programming on the practically processed tooth shape and inputting the data into slow feeding silk cutting equipment; processing the pretreated materials to obtain the female mold with the tooth-shaped concave cavity. The processing precision is improved through correcting the tooth shape structure pressure angle and shape requiring the cold extrusion forming.

Description

technical field [0001] The invention belongs to the technical field of machinery, and relates to a cold extrusion die, in particular to a method for modifying the tooth shape of the cold extrusion die. Background technique [0002] Toothed parts refer to gears or parts with toothed structures. In the prior art, the toothed structures on the toothed parts are usually formed by machining. Gear shaping machine, gear planing machine and gear grinding machine) Fancheng method, etc., also use cold extrusion to process tooth-shaped parts. [0003] Compared with the machined tooth-shaped parts, the tooth-shaped parts processed by cold extrusion, the metal undergoes plastic deformation under high stress during the cold extrusion process, so the formed tooth-shaped structure is dense and the metal fibers are continuously fatigued. Strength and wear resistance are much higher than machined gears. In particular, one end of the cold-extruded tooth-shaped structure is closed, which prov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C25/02B23P15/24
CPCB21C25/02B23P15/24
Inventor 李福兴
Owner YUHUAN PUTIAN UNIDIRECTIONAL DEVICE CO LTD