久久久久久亚洲精品_免费在线观看的av网站_色百度网址导航系统_老熟妇性老熟妇性色变态_亚洲国产亚洲_无码免费的毛片基地_俄罗斯18xxoo在线_涩涩一区二区_国产成人在线网址_丁香花视频在线观看_免费的色网站_日av中文字幕_avi视频_夜夜摸日日操三级影院_99亚洲国产_少妇高潮太爽了在线播放_爱射综合网_一级一片免费_凹凸18禁在线视频_亚洲欧美一区二区在线观看_一级裸体黄色片_成人免费av网站_2021年国产精品每日更新_日本天堂在线观看视频_海鸥影视大全免费追剧大全_成年黄色大片_中文二区_深夜影院a_亚洲精品一线二线在线播放_娇妻在客厅被朋友玩得呻吟

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.