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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 parts easy to crack, wrinkle and other defects, which will have a great impact on the safe driving and service life of the car
The reason that affects 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 restricts the development of the automobile production industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The heat treatment method of mould, comprises the following steps:

[0025] (1) Heat the processed mold to 800°C, hold it for 4 hours, quickly cool it to 700°C, hold it for 4 hours, cool it slowly to 500°C, then quickly cool it to 300°C and let it out of the furnace for air cooling;

[0026] (2) Reset the air-cooled mold in a vacuum heating furnace, and perform secondary staged quenching. Among them, the primary staged quenching is: the temperature is 950°C, and the quenching time is 5 hours; the secondary staged quenching is: the temperature is 1200°C , the time is 2 hours;

[0027] (3) The mold after secondary quenching is tempered at 520°C for 6 hours;

[0028] (4) Put the tempered mold in the ion nitriding furnace, feed methane as the nitriding gas source and raise the temperature to 580°C, keep warm for 2 hours, and the ventilation flow rate is 0.4L / min; feed argon, keep warm for 2 hours, and ventilate The flow rate is 0.3L / min, the pressure is 200~400Pa, and the...

Embodiment 2

[0031] The heat treatment method of mould, comprises the following steps:

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

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

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

[0035] (4) Put the tempered mold in the ion nitriding furnace, feed methane as the nitriding gas source and raise the temperature to 570°C, keep it warm for 1.5 hours, and the ventilation flow rate is 0.2L / min; feed argon gas, keep it warm for 2 hours, and ventilate The flow rate is 0.1L / min, the pressure is 300-400Pa, and then t...

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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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