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Thermal treatment process for bearing steel gauge blocks

A process and bearing technology, applied in the field of heat treatment, can solve problems such as large measurement errors, decreased precision, and dimensional changes, and achieve the effects of high precision, good wear resistance, and high hardness

Inactive Publication Date: 2016-06-29
QINGDAO TAIWEI MACHINE TOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, when heat-treating the bearing steel gauge block, quenching and tempering treatment is usually adopted first, and then the surface carburizing and quenching process is carried out. Big

Method used

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Embodiment Construction

[0011] 1. After spheroidizing and annealing, the workpieces with a hardness of HB187-207, a metallographic structure of spheroidized pearlite grades 2-4, and carbide segregation ≤ 3 grades are placed in a heating furnace at a temperature of 500 ° C to 600 ° C. Preheat for 30-35 minutes. 2, the workpiece after the above-mentioned preheating is placed in a medium temperature salt bath furnace, after being incubated at a temperature of 840°C to 850°C for 18 to 22 minutes, the workpiece is taken out, and quickly quenched into light diesel oil or No. 10 machine oil Cool it, take it out when the temperature of the workpiece drops to 200°C, and rinse it with water.

[0012] 3. Put the workpiece after the above-mentioned quenching treatment into the freezer in time within 30 minutes, and keep it warm for 2 to 4 hours at a temperature of -75°C to -80°C.

[0013] 4. Roughly grind the above-mentioned frozen workpiece, put it in an oil furnace incubator, keep it warm at 110°C-120°C for 3...

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Abstract

A thermal treatment process for bearing steel gauge blocks is characterized by comprising the technological steps of preheating, quenching, freezing treatment, ageing treatment, heat preservation and grinding. Workpieces subjected to treatment is high in surface hardness, good in abrasion resistance and high in precision.

Description

technical field [0001] The invention relates to a heat treatment method in machining, in particular to a heat treatment process for a bearing steel gauge block. Background technique [0002] In the prior art, when heat-treating the bearing steel gauge block, quenching and tempering treatment is usually adopted first, and then the surface carburizing and quenching process is carried out. The processed gauge block is prone to dimensional changes during use, resulting in decreased accuracy and measurement errors. Big. Contents of the invention [0003] The object of the present invention is to overcome the above disadvantages and provide a heat treatment process for bearing steel gauge blocks with high surface hardness, good wear resistance and high precision after treatment. [0004] For realizing the above-mentioned purpose of the invention, the concrete processing step that the present invention adopts is as follows: [0005] 1. Preheating: Place the workpiece that has b...

Claims

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Application Information

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IPC IPC(8): C21D6/00
Inventor 秦海鹏
Owner QINGDAO TAIWEI MACHINE TOOL