亚洲 日韩 色 图网站_久久精品国产99国产精品导航_搡BBBB推BBBB推BBBB_亚洲午夜精品A片久久不卡蜜垫 _国产自偷亚洲精品页65页_99久久久无码国产精品试看_国产成人Av一区二区三区不卡_在线日韩av免费永久观看_久久嫩草国产成人一区_在线播放成人网站

The forging method for large piston rods is usually free forging, and there are also methods to reduce the machining amount of the piston rod head by using the piston head die forging and then welding with the piston rod. This process uses a combination of free forging and swaging to process the piston rod, which not only forms the head shape of the piston rod, but also achieves the integration of the head and rod of the piston rod. At the same time, this process can achieve mold production of several different specifications of products.
The free forging process can meet the actual production needs when the batch size is small, but for batch production, its shortcomings are exposed.
Free forging processing technology: heating, forging (free forging hammer 2t), normalizing, rough machining, heat treatment, and precision machining. The labor intensity of machining is high, and it is very difficult to manually process the complex shape of the piston rod head.