Heat treatment method for mold

A heat treatment method and mold technology, applied in the field of heat treatment, can solve the problems of complex machining accuracy of the profile, easy cracking of parts, and high rework rate, and achieve the effects of simplifying the production process, shortening the treatment time, and uniform spheroidized structure.

Inactive Publication Date: 2017-04-26
LIUZHOU TONGWEI MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Automobile production requires a variety of molds. Most of the production molds have the characteristics of complex shapes, high strength, and high processing precision requirements. For example, excessive residual stress formed by mold heat treatment can easily cause deformation during use, which not only affects the service life of the entire mold , It will also cause uneven loads on the produced auto parts, making the produced p

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example one

[0024] The heat treatment method of the mold includes the following steps:

[0025] (1) Heat the processed mold to 800°C, keep it warm for 4 hours, quickly cool to 700°C, keep it warm for 4 hours, slowly cool to 500°C, and then quickly cool it to 300°C and leave it air-cooled;

[0026] (2) Reset the air-cooled mold in a vacuum heating furnace and perform secondary stage quenching. Among them, the first stage quenching is: the temperature is 950℃, the quenching time is 5 hours; the second stage quenching is: the temperature is 1200℃ , The time is 2 hours;

[0027] (3) The mold after the second quenching shall be tempered at high temperature at 520℃ for 6 hours;

[0028] (4) Put the tempered mold in an ion nitriding furnace, and pass in methane as the nitrogen infiltration source to increase the temperature by 580°C, keep it for 2 hours, and the ventilation flow rate is 0.4L / min; pass in argon, keep it for 2 hours, and ventilate The flow rate is 0.3L / min, the pressu...

Example Embodiment

[0030] Example two

[0031] The heat treatment method of the mold includes the following steps:

[0032] (1) Heat the processed mold to 8°C, keep it warm for 3 hours, quickly cool to 650°C, keep it warm for 5 hours, slowly cool to 500°C, and then quickly cool it to 300°C and leave it air-cooled;

[0033] (2) Reset the air-cooled mold in a vacuum heating furnace and perform secondary stage quenching. Among them, the first stage quenching is: the temperature is 980℃, and the quenching time is 4 hours; the second stage quenching is: the temperature is 1200℃ , The time is 2 to 4 hours;

[0034] (3) The mold after secondary quenching shall be tempered at 540°C for 5 hours;

[0035] (4) Put the tempered mold in an ion nitriding furnace, and pass in methane as a nitrogen infiltration source to increase the temperature by 570℃, keep it for 1.5 hours, and the ventilation flow rate is 0.2L / min; pass in argon, keep it for 2 hours, and ventilate The flow rate is 0.1L / min, the pressure is 300~400P...

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PUM

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Abstract

The invention relates to a heat treatment method, in particular to a heat treatment method for an automobile mold. The method includes the following steps that firstly, isothermal spheroidizing annealing is performed; secondly, a mold subjected to air cooling is placed into a vacuum heating furnace again to be subjected to secondary step quenching; third, the mold subjected to secondary step quenching is subjected to high temperature tempering; fourthly, the mold subjected to tempering is placed in an ion nitriding furnace, a nitriding gas source is introduced to perform ion nitriding, after heat preservation is performed for 2-4 hours, the nitriding gas source is closed, and air is introduced to perform low pressure oxidation; and fifthly, the mold subjected to nitriding is subjected to low pressure slow cooling till room temperature is achieved. According to the method, methane and argon as are alternately used as the nitriding gas source, the production period can be effectively shortened, and the surface brittleness of the mold is lowered; and a low pressure oxidation process integrates traditional nitriding and oxidization processes, the production process is simplified, and the treatment time is shortened.

Description

technical field [0001] The invention relates to a heat treatment method, in particular to a heat treatment method for automobile moulds. Background technique [0002] Automobile production requires a variety of molds. Most of the production molds have the characteristics of complex shapes, high strength, and high processing precision requirements. For example, excessive residual stress formed by mold heat treatment can easily cause deformation during use, which not only affects the service life of the entire mold , It will also cause uneven loads on the produced auto parts, causing the produced parts to have defects such as cracking and wrinkling, which will have a great impact on the safe driving and service life of the car. The reason affecting the current mold production process is the instability and immaturity of heat treatment technology, which not only makes the production cost of auto parts high, but also has uneven load on machine tools and high rework rate, which r...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D1/32C21D9/00C23C8/38C23C8/26
CPCC21D1/18C21D1/32C21D9/0068C23C8/26C23C8/38
Inventor 袁玮骏黄名兴唐绍淼罗丙球
Owner LIUZHOU TONGWEI MACHINERY
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