MULTIVARIABLE EFFECTS ON AN AUTOMATIC SCREW-TORQUING PROCESS

Laboratory instrumentation of an automatic screw-fastening process for small screws was successfully set up and tested. Three different sens ors were used to measure the force curve, torque curve, and rotating s peed of a screwdriver. A programmable horizontal servoslide was taught to do the fastening job. Design of experiments was employed to identi fy the significant factors that might have an impact on the final torq uing process. In addition to the size of screw and workpiece material, screwhead geometry, rotating speed of the driver, and servoslide spee d have significant individual effects on the final torquing process. T wo 2-factor interactions also influence the final torquing process. Wh en the peak torque of a screw-fastening process falls within a certain range value of the predicted value, it is identified as a sound faste ning.