How does Manhart (Guangdong) CNC Machine Tool Co., Ltd. optimize the heat treatment process to reduce the heat treatment deformation of the mold?

How to optimize heat treatment process to reduce heat treatment deformation of molds
1、 简介
Heat treatment is an important part of the mold manufacturing process, which can improve the hardness, wear resistance, and corrosion resistance of the mold. However, the deformation of molds during heat treatment has always been a problem for the manufacturing industry. To solve this problem, we need to optimize the heat treatment process to reduce the heat treatment deformation of the mold.
2、 Optimize heat treatment process to reduce mold deformation
1. Precise control of heating speed
Heating speed is an important factor affecting the deformation of mold during heat treatment. Excessive heating speed may cause a large temperature difference between the inside and outside of the mold, resulting in thermal stress and deformation of the mold. Therefore, precise control of heating speed and maintaining an appropriate heating rate can help reduce the heat treatment deformation of the mold.
2. Uniform heating and cooling
Uniform heating and cooling are crucial for preventing mold deformation during heat treatment. To achieve this goal, reasonable heating methods such as preheating and uniform heating can be adopted to ensure that all parts of the mold are uniformly heated. At the same time, appropriate measures should also be taken during the cooling process, such as slow cooling, controlling the cooling speed, etc., to reduce the cooling stress of the mold.
3. Choose the appropriate heating medium
The selection of heating medium directly affects the heating effect of the mold. Suitable heating media should be selected based on factors such as the material, size, and shape of the mold. For large molds, high-temperature media such as hot oil and molten salt can be selected; For small molds, low-temperature media such as air and gas can be chosen. In addition, the cleanliness and stability of the heating medium also need to be taken into consideration to avoid adverse effects on the mold.
4. Control heating temperature and time
Heating temperature and time are important factors affecting the deformation of mold during heat treatment. Excessive heating temperature may cause the mold structure to become coarse, reducing its performance; Excessive heating time may lead to excessive heat penetration of the mold, increasing the risk of deformation. Therefore, it is necessary to control the heating temperature and time reasonably according to the material and requirements of the mold, in order to obtain the ideal microstructure and performance.
5. Optimize quenching medium and method
Quenching is a crucial step in the heat treatment process of molds, which has a significant impact on the performance and deformation of the molds. Optimizing the quenching medium and method can reduce the quenching stress and deformation of the mold. For example, quenching methods such as graded quenching and isothermal quenching can be used to reduce quenching stress and deformation. Meanwhile, selecting suitable quenching media such as polyethylene glycol, quenching oil, etc. can also reduce the quenching deformation of the mold.
6. Preheating and tempering treatment
Preheating treatment can eliminate internal stress in the mold and reduce heat treatment deformation. Preheating the mold before heating can reduce the temperature difference between the mold and the heating medium, thereby reducing thermal stress. In addition, tempering treatment can also eliminate the internal stress generated during the quenching process, further improving the stability of the mold. By reasonable preheating and tempering treatment, the heat treatment deformation of the mold can be effectively reduced.
7. Reasonably design the mold structure
The design of mold structure has a significant impact on preventing heat treatment deformation. In the design process, factors such as the structural characteristics, stress conditions, and heat conduction of the mold should be fully considered. For example, stress concentration can be reduced by adding rounded corners, improving section transitions, and other methods; Meanwhile, optimizing the cooling structure of the mold, such as adding cooling holes and optimizing cooling water channels, can also improve the cooling effect of the mold and reduce the risk of deformation.
8. Post calibration and correction
Although we can reduce mold deformation by optimizing the heat treatment process, there may still be a certain degree of deformation in the actual production process. To eliminate these deformations, post correction and correction methods can be used. For example, for molds with slight deformation, correction can be carried out through methods such as mechanical processing and heat treatment; For molds with significant deformation, it may be necessary to redesign or modify the manufacturing process.
3、 结论
Optimizing the heat treatment process is the key to reducing mold heat treatment deformation. By precise control of heating speed, uniform heating and cooling, selection of appropriate heating medium, control of heating temperature and time, optimization of quenching medium and method, preheating and tempering treatment, reasonable design of mold structure, and later calibration and correction measures, the risk of heat treatment deformation of molds can be effectively reduced, and the stability and service life of molds can be improved. In the actual production process, we should take appropriate optimization measures according to the specific situation to achieve the best heat treatment effect.