Heat treatment technique of lock case die carrier

A shell-locking formwork and heat treatment process technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as uneven hardness of upper and lower mold surfaces, quenching failure, etc., to reduce quenching soft spots, ensure quenching effect, and guarantee The effect of cooling rate

Inactive Publication Date: 2015-12-23
JIANGSU LEAP MACHINE
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a heat treatment process for the lock case formwork to solve the problem that the hardness of the upper and lower mold surfaces is prone to be uneven after the heat treatment and quenching of the lock case formwork, which leads to the problem of quenching failure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0008] The present invention will be further described in detail below in conjunction with specific embodiments:

[0009] The outer contour of the lock shell mold frame is a rectangular structure. Take 5 sets of lock shell mold frames and put them in a vacuum furnace and heat them to 1130°C for 100 minutes, then remove them from the furnace and place them at an inclination angle of 45°. Put it into the salt water with the concentration of 8%, 9%, 10%, 11%, and 12% respectively, and temper after cooling and measure the hardness of the upper and lower mold surfaces.

[0010] The specific hardness test results are as follows.

[0011] Example Salt water concentration (%) Upper die hardness (HRC) Die hardness (HRC) 1861.160.2 2960.859.8 31060.260.3 41160.259.6 51260.560.1

[0012] Using salt water with a concentration of 8%-12% as the quenching medium can quickly rupture the bubbles generated when the die set enters the quenching medium, thereby reducing the quenching soft point, ens...

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PUM

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Abstract

The invention discloses a heat treatment technique of a lock case die carrier. The outline of the lock case die carrier is in a cuboid structure. The heat treatment process comprises the steps of heating and holding, quenching and tempering. The quenching medium adopted by the quenching after the heating and holding is saline water with the concentration of 8-12%; and when the lock case die carrier enters the quenching medium, an inclination angle of greater than 45 degrees is kept between the lock case die carrier and the horizontal surface of the quenching medium. By using the saline water with the concentration of 8-12% as the quenching medium, bubbles, which are generated when the die carrier enters the quenching medium, can quickly rupture, thereby lowering the quenching soft spot, ensuring the same cooling rate of the upper and lower die surfaces, and further ensuring the quenching soft spot hardness of the upper and lower die surfaces. The lock case die carrier is put into the quenching medium at the inclination angle of greater than 45 degrees, so that the bubbles can rupture and flow away, thereby ensuring the quenching effect and ensuring the upper and lower die surfaces to be respectively within the hardness range.

Description

Technical field [0001] The invention relates to the field of hot forging applications, in particular to a heat treatment process for a shell-locking mold base. Background technique [0002] The lock shell matched with the lock bolt is usually a casting, and later changed to forging due to customer demand, while the lock shell mold base is a special mold base for lock shell forging. The material is 45# steel, but the upper and lower molds are easy to appear during the heat treatment and quenching process. The surface hardness is uneven, causing quenching failure. Summary of the invention [0003] The purpose of the present invention is to provide a heat treatment process for the shell mold base to solve the problem that the shell mold base is prone to have uneven hardness of the upper and lower mold surfaces after heat treatment and quenching, resulting in quenching failure. [0004] In order to achieve the above objective, the technical solution adopted by the present invention is:...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D1/18C21D1/60
Inventor 蒋波
Owner JIANGSU LEAP MACHINE
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