(l) Take measures from the sharpening of the drill bit to overcome the phenomenon of drilling deviation. To shorten the chisel edge, make the edge shape of the drill well centered, and form a turning point on the main cutting edge, which is conducive to chip separation and chip breaking. Increase th... read more
As we all know, there are many main factors that affect the carburizing process of locking self-tapping screws, such as temperature and time. When the screw material, carburizing temperature and carbon potential are determined, the carburizing time will be determined according to the depth of the ca... read more
In the process of screwing the screw into the prefabricated hole of the connected part (drilling, punching a shell or die-casting smooth hole), the screw thread is extruded to form an internal thread in the prefabricated hole , To achieve the purpose of connection and fastening. The structure of sel... read more
Hydrogen embrittlement is a relatively prominent hidden quality hazard of self-drilling and self-tapping screws. The problem of hydrogen embrittlement is more prominent than that of carburized parts in the screws that are directly quenched by hydrocarbon co-infiltration. The hydrogen generated durin... read more
(1) The screw-in performance test is to screw the self-tapping locking screw sample into the test plate until a complete thread passes through the test plate without damage; (2) The destructive torque test is to clamp the rod of the self-tapping screw test piece in an opening and closing thread mold... read more
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