Cryogenic process for prolonging service life of jet-moulded high-speed steel milling cutter

A spray forming, high-speed steel technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problem of less application of cryogenic processes, and achieve the effect of improving mechanical properties and service life, wear resistance and hardness.

Active Publication Date: 2013-10-16
上海汇众汽车车桥系统有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the heat treatment process commonly used by enterprises for high-speed steel is quenching

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0018] Fully preheat the high-speed steel milling cutter in a vacuum furnace at 790-830°C for 15-35 minutes; heat the preheated high-speed steel milling cutter in a vacuum quenching furnace at 1100-1160°C for 20-40 minutes, air-cool, Oil quenching; then tempering once in a tempering furnace at 530~600°C, holding time 1~3 hours; put the high-speed steel milling cutter after tempering once in a cryogenic box at a speed of 1~4°C / min Drop from room temperature to -60~-100°C for 1~4 hours, then place it in a liquid nitrogen tank for 20~24 hours, then keep it in a cryogenic box for 1~2 hours at -60~-100°C, and finally air cool To room temperature; Temper the cryogenically treated high-speed steel milling cutter twice in a tempering furnace at 530-600°C, hold for 1-3 hours each time, and air-cool to room temperature.

[0019] After processing according to the above process, the hardness of the end face of the milling cutter is 65.2HRC, and the weight loss of the friction and wear tes...

Embodiment approach 2

[0021] Fully preheat the high-speed steel milling cutter in a vacuum furnace at 790-830°C for 15-35 minutes; heat the preheated high-speed steel milling cutter in a vacuum quenching furnace at 1100-1160°C for 20-40 minutes, air-cool, Oil quenching; then temper twice in a tempering furnace at 530~600°C for 1~3 hours; put the high-speed steel milling cutter after tempering twice in a cryogenic box at a speed of 1~4°C / min Drop from room temperature to -60~-100°C for 1~4 hours, then place it in a liquid nitrogen tank for 20~24 hours, then keep it in a cryogenic box for 1~2 hours at -60~-100°C, and finally air cool to room temperature; temper the cryogenically treated high-speed steel milling cutter once in a tempering furnace at 530-600°C, hold for 1-3 hours each time, and air-cool to room temperature.

[0022] After treatment according to the above process, the hardness of the end face of the milling cutter is 64.4HRC, and the weight loss of the friction and wear test sample is 0...

Embodiment approach 3

[0024] Fully preheat the high-speed steel milling cutter in a vacuum furnace at 790-830°C for 15-35 minutes; heat the preheated high-speed steel milling cutter in a vacuum quenching furnace at 1100-1160°C for 20-40 minutes, air-cool, Oil quenching; then temper 3 times in a tempering furnace at 530~600°C, holding time is 1~3 hours; put the high-speed steel milling cutter after 3 times tempering in a cryogenic box at a speed of 1~4°C / min Drop from room temperature to -60~-100°C for 1~4 hours, then place it in a liquid nitrogen tank for 20~24 hours, then keep it in a cryogenic box for 1~2 hours at -60~-100°C, and finally air cool to room temperature.

[0025] After treatment according to the above process, the hardness of the end face of the milling cutter is 65.1HRC, and the weight loss of the friction and wear test sample is 0.015~0.016 grams.

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PUM

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Abstract

The invention relates to the technical field of cryogenic processes, in particular to a cryogenic process for prolonging the service life of a jet-moulded high-speed steel milling cutter. The cryogenic process for prolonging the service life of the jet-moulded high-speed steel milling cutter is characterized by comprising the following specific steps: preheating; quenching in vacuum; cooling; tempering primarily; performing cryogenic treatment; and tempering secondarily. Compared with the prior art, a new technology for combining vacuum quenching, tempering and cryogenic treatment is performed on a material of the jet-moulded high-speed steel milling cutter, so that after treatment of the cryogenic process, the wear resistance and the hardness of the material of the jet-moulded high-speed steel milling cutter are obviously improved, the comprehensive mechanical property of the milling cutter is improved and the service life of the milling cutter is prolonged.

Description

technical field [0001] The invention relates to the technical field of cryogenic technology, in particular to a cryogenic process for improving the service life of spray-formed high-speed steel milling cutters. Background technique [0002] The widespread use of high-strength steel in the automotive industry has made the wear and consumption of machining tools a key issue affecting the production efficiency and precision of the manufacturing industry. At present, the high-speed steel milling cutters produced by melting casting and electroslag remelting methods are prone to early failures such as chipping, cracking, and wear during use, resulting in low production efficiency and increased processing costs. [0003] At present, the heat treatment process commonly used by enterprises for high-speed steel is quenching and tempering three times, and the cryogenic process is rarely used, especially for spray-molded high-speed steel. Therefore, it is particularly important to stud...

Claims

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Application Information

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IPC IPC(8): C21D9/22C21D1/18C21D1/773
Inventor 陶立民孙文娟应莉娜吴晓春
Owner 上海汇众汽车车桥系统有限公司
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