1. What are the classifications of forging die materials?
1. Forging die materials are divided into: hot forging die materials and cold forging die materials. Hot forging die materials are: H13, 3Cr2W8V, LG, 8566. Among them, DAO8566 die steel has good high temperature resistance, hardness HRC58-60, high hardness and good wear resistance. LG mold steel has very good toughness, and the hardness HRC54-56 is used.
2. Cold work die steel: Cold work die steel is mainly used to manufacture cold work molds, such as stamping dies, shearing dies, cold heading dies, etc. This steel has high hardness, high wear resistance and high impact resistance, and is able to maintain good cutting performance at low temperatures.
3. Types of mold materials: forging forming molds; stamping dies; plastic molding molds; metal molds for casting; die-casting molds; powder metallurgy mold forming mold; glassware molds; rubber molding molds; ceramic molds; Economic molds (simple molds).
4. Then the selection of materials has an important impact on the manufacturing process and product quality, and the common mold materials include the following types: steel Steel is a common mold material, which has the characteristics of high strength, high hardness, high wear resistance, etc. Steel is divided into various types such as ordinary carbon steel, alloy steel, and tool steel.
5. Classification according to negative characteristics. Depending on the nature of the load or the type of equipment that the die is subjected to, the die material can be divided into impact load (forging hammer, screw press or screw hammer) and static load (hydraulic press, mechanical press, roll forging machine and rolling machine) die material.
6. This document will introduce the types of mold materials, including metal materials, non-metallic materials, ceramic materials and polymer materials. Metal MaterialsMetal materials are one of the more common mold materials. Metal materials can be divided into two categories: casting materials and tool steels.
Second, what kind of materials are generally used in forging molds, and what is the heat treatment process
1. H13 steel (improved type of H11 steel) is the main material of hot forging steel and cold heading die sleeve in China, and it is also a hot work die steel with strong versatility, which is an ideal steel to replace 3Cr2W8V steel, and the service life can be increased by 2-3 times. 4Cr3Mo3SiV(H1 steel has high toughness, high temperature softening resistance and moderate level of wear resistance.
2. Heat treatment process: After cryogenic treatment of die steel, its mechanical properties can be improved, thereby promoting the improvement of its service life. The die steel can be cryogenic between the tempering and quenching processes, and the cryogenic treatment can promote the improvement of the steel's anti-tempering stability and wear resistance.
3. Mold materials can be divided into three categories according to the use of mold materials: cold work die steel--- under the condition of no heating, the processed materials are processed and formed by punching, bending, drawing, upsetting and extrusion.
4. Impact toughness is a measure of the ability of the mold material to resist breaking under impact load.
The higher the impact toughness (AK) of the material, the higher the thermal fatigue strength.
Therefore, reasonable forging and heat treatment methods and process parameters should be adopted to prevent carbide segregation and coarse grains, reduce quenching stress, and improve the toughness of steel.
5. Improper grinding process of mold heat treatment. During EDM machining after heat treatment of the mold, there is a high tensile stress and microcracks in the hardened layer. Precautionary measures: Strictly control the intrinsic quality of the mold raw materials to improve the forging and spheroidization annealing process, eliminate the reticulated, ribbon and chain carbides, and improve the uniformity of the spheroidized structure.
6. Die steel is a raw material that needs to be used in the processing of many products on the market, and we will talk about the heat treatment methods of metal die steel today. The heat treatment of metal die steel is a process method that heats, insulates and cools the metal die steel material in a solid state to change its internal structure, so as to obtain the required performance.