熟女人妻一区二区三区免费看_日日鲁鲁夜夜狼狼视频_av蜜臀一区二区三区久久_91视频免费在线_日本靠逼视频_成全视频在线观看免费观看在线_国产高清久久久_人妻无码AV中文系列久久兔费_高清无H码动漫在线观看网站_国产又色又爽又黄的A片_免费尻逼视频_亚洲精品乱码中文久久_无翼乌口工全彩无遮挡老师_特大巨黑吊性XXXX_av网站地址_国产一区二区视频免费在线观看_羞羞影院男女爽爽影院尤物_欧美午夜精品_最后一夜高清观看HD_天堂中文在线8最新版地址_最新无码A∨在线观看_午夜免费一区二区播放_隔着超薄肉丝袜做AV在线_chinesefreexxxx麻豆_一级片毛片_动漫av在线看男男_中文字幕丰满乱码_婷婷开心激情综合五月天_亚洲麻豆国产自偷在线_久久人人爽人人爽人人片DVD

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.