免费国产视频_亚洲国产女人精品久久久_国产欧美日产A片_91porn国产_欧美精品久久久久久久久久丰满_日日日夜夜操_91熟妇视频_精品探花对白视频在线观看,97久人人做人人妻人人玩精品 ,91露脸熟女对白不带套,正在播放日韩一区二区

The bending of metal stamping parts is a processing method of bending flat plates, pipes, and profiles into workpieces with a certain angle or shape using molds or other tools. It is one of the basic stamping processes and occupies a large proportion in the production of metal stamping parts; There are various types of parts that are formed by bending, such as car beams, bicycle handlebars, door and window hinges, various electrical brackets, etc;

There are many curved shapes for metal stamping parts, including V-shaped parts, U-shaped parts, Z-shaped parts, O-shaped parts, and other shaped parts; The bending method varies depending on the equipment and mold used; Bending forming is usually carried out on mechanical presses (punches), friction presses, or hydraulic presses, as well as on specialized equipment such as bending machines, rolling machines, pipe bending machines, and tension bending machines;

The characteristic of bending on a press is that the tool moves in a straight line, known as bending; The bending forming on some specialized equipment, where the tool rotates, is called bending, rolling, or rolling