Stamping mold is a special process equipment for manufacturing stamping materials into parts. Stamping mold is an important tool to achieve less and no cutting. The life of the mold directly affects the quality and efficiency. Factors that affect the life of the mold include mold material, material heat treatment and surface treatment, and mold manufacturing process. The following is a brief introduction to the manufacturing process of stamping molds:
1. Heat treatment technology of stamping molds
The heat treatment of mold materials is a very important process in the mold manufacturing process. The material can be changed through heat treatment The organization and performance ensure the ultimate service life of the mold. The selection of mold heat treatment methods and processes must also be determined based on the conditions, failure modes and different performance requirements of the mold. Improve the heat treatment equipment and heat treatment process to achieve the best combination of material strength and toughness; strictly follow the heat treatment process and control the heating temperature, time, and cooling rate to ensure the performance of the mold.
2. Surface treatment technology of stamping die
The part of the cold stamping die is the cutting edge. The punch is subject to strong friction when punching and pulling out from the plate, so the hedging The requirement for the loading mold is that the cutting edge surface must have good wear resistance. Surface treatment can not only maintain sufficient strength and toughness of the matrix, but also improve the wear resistance of the material surface. Commonly used mold surface strengthening treatment technologies can be divided into three categories:
(1) Methods to change the chemical composition of the substrate surface, such as metallurgy, carburizing, nitriding, etc.;
( 2) Methods that do not change the chemical composition of the substrate surface, such as laser surface modification technology, electron beam surface treatment, etc.;
(3) Methods that form a hardened layer on the substrate surface, such as chromium plating, thermal spraying, etc.
Each strengthening method has a certain scope of application. Therefore, to fully understand the characteristics of various surface strengthening treatment methods, it must be based on different conditions and different requirements for performance, such as wear resistance, resistance to wear and tear. Choose a reasonable surface strengthening treatment method based on different performance requirements such as adhesion and toughness.
3. Mechanical manufacturing technology of stamping molds
The mechanical manufacturing process of cold stamping molds usually refers to the manufacturing method of the main parts of the stamping die, such as the punch and the concave die, and the accuracy of the main parts of the stamping die. And surface quality directly affects the service life of the mold.
(1) The wire EDM process has developed rapidly due to its advantages of high precision and high automation, and has been widely used in mold manufacturing, forming tools and precision and complex parts.
(2) The grinding process is also one of the important factors affecting the life of the mold. On the one hand, a reasonable grinding process will improve the dimensional accuracy and surface roughness. At the same time, a reasonable grinding process such as grinding feed The quantity, grinding wheel selection, etc. can affect the occurrence of grinding cracks and ultimately affect the life of the mold.
IV. Stamping mold related technologies
An important milestone in the development of CNC and computer-aided design mold manufacturing, no matter in terms of mold manufacturing accuracy, surface roughness, manufacturing cycle, etc. Assessment, CNC technology is the direction of mold development. The composite process that integrates ultra-precision technology and electrochemistry, ultrasonic, laser and other technologies will have broad prospects. At the same time, the research and development of advanced digital measurement and automation systems will also be the long-term development goal of my country's mold manufacturing technology.