免费99精品国产人妻自在现线-亚洲欧美另类日本-日本不卡视频在线-国内精品久久久久久久影视麻豆-欧美乱轮-噼里啪啦免费高清看-av色图片-四川丰满妇女毛片四川话-亚洲精品久久久久久成人-俄罗斯美女av-午夜精品久久久久久久久-亚洲 都市 无码 校园 激情-爱情岛成人www永久地址-免费国产网站-国产欧美综合在线-国产叼嘿视频在线观看-老妇做爰xxx视频一区二区三区-第一福利蓝导航柠檬导航av-野花社区视频www官网-欧美丰满熟妇乱xxxxx网站

Metal stamping die, the use of a variety of metal materials, mainly carbon steel, alloy steel, cast iron, cast steel, cemented carbide, low melting point alloy, zinc-based alloy, aluminum bronze, synthetic resin, polyurethane rubber, Laminated birch board and so on.

Mold material, requiring high hardness, high strength, high wear resistance, appropriate toughness, high hardenability and heat treatment is not deformed and difficult to crack and other properties of quenching.

Reasonable selection of mold materials and the implementation of the correct heat treatment process is to ensure that the key to the life of the mold. Mold for different purposes, should be based on their working conditions, stress conditions and materials to be processed performance, production volume and productivity and other factors considered, and the performance of the above requirements have focused, and then made the steel and heat treatment The corresponding choice of technology.