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Machining method of 20SiMnVB 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
  • Claims
  • 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 of 20SiMnVB brake shoe roller shaft, including the following steps in sequence: blanking, annealing, shot blasting, softening, extrusion, rough turning, fine turning, carburizing, pre-cooling and quenching, low temperature tempering, Second shot blasting, fine grinding;

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

[0020] 2. Annealing: Put the billet into an industrial electric furnace for annealing treatment. The temperature in the furnace is heated to 850±50℃ for 5-7h, and then cooled with the furnace;

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

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

[0023] 5. Extrusion: Put the mold into the cold extrusion hydraulic press to complete the cold extrusion in a one-time forming method to obtain the semi-finished pr...

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PUM

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Abstract

The invention discloses a machining method of a 20SiMinVB brake shoe roller shaft, and belongs to the technical field of machine part machining. The machining method sequentially includes the following steps of feeding, annealing, shot blasting, softening, extrusion, rough turning, finish turning, carburizing treatment, pre-cooling and quenching, low-temperature tempering, secondary shot blastingand finish grinding; temperature rising is performed twice, temperature reduction and pre-cooling and quenching are performed, tempering is performed twice, so that grains are effectively refined, martensite needles are refined, the content of residual austenite on a surface layer is reduced, the mechanical performance of high alloy carburized steel gears is greatly improved, and the ductility andtoughness index is significantly improved.

Description

Technical field [0001] The invention relates to the technical field of machining parts, in particular to a method for processing a 20SiMnVB brake shoe roller shaft. Background technique [0002] The vehicle brake is an important part of the vehicle and the key to ensuring driving safety. Currently commonly used vehicle brakes include drum brakes and disc brakes. At present, the drum brakes widely used in domestic trailers, semi-trailers, and trucks are composed of brake bottom plates, brake shoes, friction linings, brake shoe support pins, camshafts, return springs, adjusting arms, tension springs, roller shafts, Components such as rollers. The roller shaft is also called the brake shoe roller pin. It is used 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 rotating brake drum to generate ...

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
CPCB23P15/00B23P15/14C21D1/18C21D6/005C21D6/008C21D9/28C21D9/32C23C8/22C23C8/46C23C8/66
Inventor 梁宏军
Owner 谷城天兴机械有限公司
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