已经有次观看 wencong在2014-09-24发布

Channel：Non-ferrous Metal 标签： Gear  cutting,  machining 

简介：Chipless processing technology began in the 18th century gear. 1950s, the Federal German research success precision forging gear. After 60 years, they developed a method of powder metallurgy, powder forging and fine blanking gears.