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Heat treatment process for cylindrical die roll

A thread rolling wheel and process technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as unsatisfactory use effects and edge chipping

Inactive Publication Date: 2016-06-29
CHONGQING LINGYI MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology generally adopts Cr12MoV steel thread rolling wheel, the effect of use is not satisfactory, and its failure mode is often chipping

Method used

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with embodiment:

[0012] A heat treatment process for a thread rolling wheel, using Cr12MoV material, comprising the following process steps:

[0013] (1) Forging: After three times of upsetting and drawing, the carbides are crushed, and carbide segregation is required to be grade 3 after forging;

[0014] (2) Spheroidizing annealing: heating at 840-860°C, holding for 3-4h, cooling to 700-730°C, holding for 3-4h, cooling to 450-500°C with the furnace, and the hardness after annealing is HB220-250;

[0015] (3) Quenching and tempering: 820-845°C, time 30-45min salt bath preheating; at 1100-1120°C, time 45-60min salt bath heating oil quenching; 750-760°C, time 2-2.5h tempering; air cooling Hardness HB250-280 after treatment;

[0016] (4) Quenching and tempering: 840-860°C, time 40-50min salt bath preheating; at 1100-1120°C, time 45-60min salt bath heating oil quenching; 200-230°C temperature, time 2-2...

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PUM

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Abstract

The invention discloses a heat treatment process for a cylindrical die roll. The heat treatment process employs a Cr12MoV material and is characterized by comprising the following steps: (1) forging; (2) spheroidizing annealing; (3) hardening and tempering; and (4) quenching and tempering. According to the invention, a novel zero-insulation quenching process is employed for the cylindrical die roll, so the disadvantages of overheat, large crystal grains, tipping, easy oxidation and decarburization, etc. are thoroughly overcome; and compared with a cylindrical die roll prepared by using conventional quenching processes, the cylindrical die roll prepared in the invention has the advantages of high hardness, good toughness and plasticity, reduction in tipping defects, long service life and good economic benefits.

Description

technical field [0001] The invention belongs to the field of heat treatment technology, in particular to a heat treatment technology of a thread rolling wheel. Background technique [0002] The thread rolling wheel is an external thread rolling tool. In the thread cutter and standard parts manufacturing plant, the thread rolling wheel is the key tooling and important tool in the production process. Its lifespan and quality directly affect the accuracy of the processed taps, standard parts and other workpieces. significant impact on production progress. Therefore, the processing quality of the thread rolling wheel is particularly critical. Statistical analysis of the failure of thread rolling wheel shows that heat treatment is undoubtedly the most important influencing factor. Cr12MoV steel thread rolling wheels are generally used in the prior art, and the use effect is not satisfactory, and the failure mode is often chipping. Contents of the invention [0003] The obje...

Claims

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Application Information

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IPC IPC(8): C21D9/34C21D1/18
Inventor 张刚
Owner CHONGQING LINGYI MACHINERY CO LTD
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