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        1. 您好,歡迎訪問濟南七和模具有限公司 !







            來源:http://www.environmentandpeople.net/ 日期:2022-06-21 發布人:guanli

            What are the cutting processes of cold working die steel?
            Most cold working die steels are difficult to cut. In order to obtain good machinability, proper heat treatment is required. For dies with high surface quality requirements, free cutting die steels containing s, Ca and other elements can be selected. Heat treatment processability mainly includes: hardenability, hardenability, resistance to reheating, overheating sensitivity, oxidation decarburization tendency, quenching deformation and cracking tendency, etc. Let's take a look at the four problems related to cold working die steel.
            What is the heat softening ability of cold working die steel?
            The heat softening ability reflects the influence of temperature rise of cold working die steel on hardness, deformation resistance and wear resistance. Softening temperature (℃) and secondary hardening hardness (HRC) are the main indicators to characterize the thermal softening resistance of cold working die steel. Bite resistance is actually the resistance to "cold welding".
            Generally, under dry friction conditions, the tested die steel sample and the material with bite tendency (such as austenitic steel) are subject to constant speed dual friction movement, and the load is gradually increased at a certain speed, at this time, the torque is also correspondingly increased. When the load increases to a certain critical value, the torque suddenly increases sharply, which means that the bite occurs. This load is called "bite critical load".
            The higher the critical load, the stronger the bite resistance. The process performance of cold working die steel is directly related to the manufacturing cycle and cost of the die. The process performance requirements of cold working die steel mainly include forging process, cutting process, heat treatment process, etc.
            How to improve the wear resistance of cold working dies?
            When the cold working die is working, there are many times of friction between the surface and the blank. In this case, the die must still be able to maintain low surface roughness and high dimensional accuracy to prevent early failure. As the hardness and structure of the die material are important factors affecting the wear resistance of the die, in order to improve the wear resistance of the cold working die, the die hardness is usually required to be 30% ~ 50% higher than the hardness of the machined part. The structure of the material is tempered martensite or lower bainite, on which are evenly distributed and fine granular carbides.
            What are the strength indexes of cold working dies?
            Strength index is an important basis for the design and material selection of cold working die steel, mainly including tensile yield point, compressive yield point, etc. Yield point is an index to measure the plastic deformation resistance of mold parts, and it is also a very common strength index. In order to obtain high strength, the toughness of the die material should be determined according to the working conditions of the die in the process of die manufacturing. For dies with strong impact load, such as punch and cold heading dies of cold working dies, due to large impact load, high toughness is required.
            The above is the relevant content about the problem shared for you today. I hope it can help you. If you want to know more, you can contact us by phone or follow our website http://www.jnhgjx.net 。







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