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1.前言用 LD 钢(7Gr7Mo3V2Si)制造冲头,有明显的使用效果。因 LD 钢是近年研究成功的新型冷作模具钢,它是以高速钢为基础演变发展来的。俗称基体钢。具有高速钢的基体成分,保留了高速钢高硬度和耐磨的特点,又有基体钢优良的综合机械性能。因碳含量降低10～20%,过剩碳化物含量一般不大于5%,韧性、抗冷热疲劳性能,冷热加工性能和强韧性得到明显改善,但基体组织马氏体与高速钢相似。随着高速、高效、高能量、大吨位自动冲床和冷镦、冷冲、冷挤压水无功削工艺的广泛
1. Preface Made with LD steel (7Gr7Mo3V2Si) punch, there is a clear effect. Because LD steel is a new type of cold-work die steel that has been successfully researched in recent years, it has evolved based on high-speed steel. Commonly known as the base steel. With high-speed steel matrix composition, retaining the high hardness and wear-resistant high-speed steel characteristics, as well as the basic steel excellent mechanical properties. Carbon content decreased by 10 to 20%, the excess carbide content is generally not more than 5%, toughness, thermal fatigue resistance, hot and cold processing performance and toughness significantly improved, but the matrix martensite and high-speed steel similar. With the high-speed, high efficiency, high energy, large-tonnage automatic punch and cold heading, cold red, cold extrusion water cutting process widely