亚洲人妖v片观看网站_成人18免费视频_亚洲av日韩av制服丝袜手机版_欧美黄日韩大片在线_在线高清国产欧美_人妻精品无码不卡中文字幕_亚洲少中文字幕黄电影_四虎电影免费观看网站_日本在线综合一区二区_国产高清啪啪免费视频

The schematic diagram of the structure before and after the riveting work of the loosening and non loosening screw, with the left image showing the free state and the right image showing the working state. The red one represents the riveted substrate. Expansion riveting process refers to a connection method in which the riveted parts are partially expanded and engaged with the sheet metal using specialized equipment, molds, and certain pressure. The equipment used in the expansion riveting process is the same as that in the pressure riveting process. The upper die head used is tapered, and pressure is used to deform the riveting part of the expansion riveting assembly, forming a certain taper, thereby completing the connection with the riveted part.