一级特黄aa大片免费播放_av大全免费观看_成年人的午夜视频_日本黄色大片网站_日韩视频播放_国产高清精品软件丝瓜软件

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.