What is the tolerance range of precision screws?
What is the tolerance range of precision screws?
Self-tapping screws, or quick-thread screws, are quick-release fasteners made of steel that are galvanized and passivated on the surface. Self-tapping screws are mostly used for the connection between thin metal plates (steel plates, saw plates, etc.). When connecting, first make a threaded bottom hole for the connected piece, and then screw the self-tapping screw into the threaded bottom hole of the connected piece.
The existing welding stud only has one welding spot on the top surface of the screw head, and the welding stud is relatively long and thick. When welding, the current will be relatively large, so that all the welding spots can be melted to complete the welding process. Because there is only one welding spot, and the welding stud is relatively long and thick, the increase of the current during welding will deform the melting point of the metal plate, which will lead to the penetration of the metal plate, which will lead to the concave and convex welding scars on the back of the welded plate, which will affect the appearance. Only one welding spot is located to be welded with the metal plate. During welding, the uneven parallelism of one spot leads to insufficient stability and a certain slope. It is easy for workers to have insufficient stability and parallelism when operating, resulting in wasted time and high scrap rate. increase.
At present, the automatic nailing device on the domestic market lacks the restraint and arrangement of the rivets when they are out of the nailing device, which makes the rivets irregular and uncontrollable after the automatic nailing is completed, which has adverse effects on on-site use and maintenance, and is unstable. .
In the current production process, the inner wall of the circlip is quantitatively and evenly lubricated, and then the rotating shaft is inserted into the circlip, so that the rotating axis can rotate in the circlip, thereby realizing the rotation function of the sun visor. However, since the circlip is tightly fitted with the rotating shaft, during the insertion process of the rotating shaft, the front end of the circlip can easily push the grease from the opening at one end of the circlip to the opening on the other end of the circlip, so that the rotating axis and the inner wall of the circlip are easily connected. There is little or no grease left between them, which can easily lead to a lack of lubrication between the shaft and the circlip, and dry friction between the shaft and the circlip, resulting in a series of problems such as abnormal noise, difficult operation, and poor durability.
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