Machining method of 20CrMnTi brake shoe roller shaft

A processing method, the technology of the roller shaft, which is applied in the field of machine parts processing, can solve the problems of a large number of cracks on the product surface, the inability to obtain qualified products, and the complex structure of the roller shaft, so as to improve the utilization rate of materials, improve the mechanical properties, and improve the comprehensive mechanics. performance effect

Inactive Publication Date: 2020-03-10
谷城天兴机械有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the structure of the roller shaft is complicated, generally using 45# round steel through hot forging and machining, the forging process is complex, and the production efficiency is low, especially after forging, each surface of the part needs to be processed. Large quantities lead to high production costs for this product
Some manufacturers experimented with extrusion technology for processing, but due to factors such as unreasonable process design and excessive deformation, there were a large number of cracks on the product surface, and qualified products could not be obtained.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A processing method for a 20CrMnTi brake shoe roller shaft, comprising the steps of blanking, annealing, shot blasting, softening, extrusion, rough turning, finish turning, carburizing, precooling and quenching, low temperature tempering, Secondary shot blasting and fine grinding;

[0019] 1. Cutting: Saw 20CrMnTi round steel into blanks;

[0020] 2. Annealing: Put the blank into an industrial electric furnace for annealing treatment, heat the temperature in the furnace to 850±50°C for 5-7 hours, and then cool it with the furnace;

[0021] 3. Shot blasting treatment: the annealed billet is shot blasted with a shot blasting machine to remove the scale while ensuring that the workpiece is not damaged;

[0022] 4. Softening treatment: degreasing, softening, neutralizing, adjusting and cleaning the blank after shot blasting treatment;

[0023] 5. Extrusion: Put the mold into the cold extrusion hydraulic press, and complete the cold extrusion action in a one-time forming m...

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PUM

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Abstract

The invention discloses a machining method of a 20CrMnTi brake shoe roller shaft and belongs to the technical field of machine part machining. The machining method sequentially comprises the followingsteps of feeding, annealing, shot blasting treatment, softening treatment, extruding, rough turning, finish turning, carburizing treatment, precooling quenching, low temperature tempering, second-time shot blasting and fine grinding. According to the machining method, the grains and the martensitic needle can be effectively refined to reduce the content of retained austenite on the surface layerthrough two-time warming, the temperature-reduction precooling quenching and two-time tempering, so that the mechanical property and the indexes of the ductility and toughness of a high-alloy carburizing steel gear are greatly and obviously improved.

Description

technical field [0001] The invention relates to the technical field of machine parts processing, in particular to a processing method for a 20CrMnTi brake shoe roller shaft. Background technique [0002] The vehicle brake is an important part of the vehicle and the key to ensuring driving safety. Vehicle brakes commonly used today include drum brakes and disc brakes. At present, the drum brake widely used in domestic trailers, semi-trailers and trucks is composed of a brake base plate, a brake shoe, a friction lining, a brake shoe support pin, a camshaft, a return spring, an adjustment arm, a tension spring, a roller shaft, components such as rollers. The roller shaft is also called the brake shoe roller pin, which is used together with the roller. The roller is sleeved on the roller shaft. When the brake is stepped on, the cam surface of the camshaft pushes the roller to open the brake shoe. The friction lining is in contact with the inner cylindrical surface of the rota...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/22C23C8/46C23C8/66C21D6/00C21D1/18C21D9/32C21D9/28B23P15/14B23P15/00
CPCB23P15/00B23P15/14C21D1/18C21D6/002C21D6/005C21D9/28C21D9/32C23C8/22C23C8/46C23C8/66
Inventor 梁宏军
Owner 谷城天兴机械有限公司
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