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A rack precision forming method by cold rotary rolling

A technology of precision forming and cold oscillating rolling, applied in the direction of manufacturing tools, forging/pressing/hammer devices, forging/pressing/hammering machinery, etc., to achieve the effects of reducing production costs, large strain strengthening, and good surface quality

Active Publication Date: 2018-05-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the precision forming method of rack cold rolling

Method used

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  • A rack precision forming method by cold rotary rolling
  • A rack precision forming method by cold rotary rolling
  • A rack precision forming method by cold rotary rolling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Such as figure 1 , the rack is left-handed, m=2mm, z=20, α=20°, β=12°, h a = 1.7 mm, h f = 2.1 mm, h 1 =8.59mm, δ=12°, H=15mm, d=25mm, L=192mm, upper die swing angle γ=1°, upper die rotation interval angle ε=0.01.

[0055] (1) The blank is designed as a long cylindrical rod whose diameter and length are equal to the diameter and length of the rack respectively.

[0056] (2) The tooth shape of the rack is formed by swinging the upper die (swing head) of the cold swing roller, and the back of the tooth shape is formed by the lower die. The entire rack only needs to be cold-rolled to form the tooth-shaped part, and the rest does not need to be formed.

[0057] (3) The upper mold of the cold swing rolling adopts a straight line trajectory, which is perpendicular to the axis of the cylindrical blank, that is, the upper mold of the cold swing rolling swings along the radial direction of the blank.

[0058] (4) The upper mold of the cold swing rolling is a pyramid, and it...

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PUM

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Abstract

The invention relates to the field of precision forming of racks, and provides a cold rotary forging precision forming method for a rack. The method is characterized by comprising the following steps that 1, a blank is designed to be a cylindrical long rod, and the diameter and the length of the cylindrical long rod are equal to those of the rack respectively; 2, a tooth profile of the rack is formed through swing of a cold rotary forging upper die, and the back face of the tooth profile is formed by a lower die; 3, a linear trajectory is adopted by the cold rotary forging upper die and is perpendicular to the axis of the cylindrical blank; 4, the cold rotary forging upper die is shaped like a pyramid, the taper angle of the pyramid is larger than or equal to 176 degrees, Boolean operation is conducted on two side faces of the pyramid and tooth profiles on the two sides of the rack in the radial direction to obtain a cold rotary forging upper die tooth profile; 5, the cold rotary forging lower die is matched with the back face of the tooth profile of the rack; 6, interference calculation is conducted on the upper die and the rack in the cold rotary forging process; 7, cold rotary forging upper die correction is conducted; 8, successive partial plastic deformation of the blank is caused under the combined action of the upper die and the lower die, and the high-precision rack is formed by cold rotary forging finally. The cold rotary forging precision forming method for the rack has the advantages that energy and materials are significantly saved, the production cost is reduced, the production efficiency is improved, and the structure and mechanical properties of the rack are improved.

Description

technical field [0001] The invention relates to the field of precision forming of racks, in particular to a method for precision forming of racks by cold rotary rolling. Background technique [0002] Rack is an important basic part widely used in mechanical transmission. It has the characteristics of large bearing capacity, long stroke and high transmission precision. It is widely used in aircraft, automobile steering gear, precision machine tools, elevators and other equipment. Its performance directly determines the equipment service performance and service life. At present, racks are mainly manufactured by cutting. The cutting cycle is long, the production efficiency is low, the material utilization rate is low, and the production cost is high. At the same time, the cutting process will cut off the metal flow line, reduce the mechanical properties and service life of the rack, and cannot manufacture high-performance racks. [0003] Cold rotary rolling is a new process ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/02B21J13/02
CPCB21J5/02B21J13/02
Inventor 韩星会华林胡亚雄冯玮庄武豪郑方焱
Owner WUHAN UNIV OF TECH
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