The screw tightening device for use in the practice of the screw tightening method and the method

摘要

PURPOSE: To loosen each screw with substantially the same torque by driving a driver with a main fastening torque necessary for main screwing calculated on the basis of temporary fastening torque, temporary fastening loosening torque and main fastening loosening torque to mainly fasten a screw to a partner member. ;CONSTITUTION: A temporary fastening torque T₁ based on data of a screw 28' and a partner member is first set and inputted to a controller, and a driver 22 is driven with this temporary fastening torque T₁ to temporarily fasten the screw 28' to the partner member. This temporary fastening is then loosened, the temporary fastening loosening torque T₂ necessary for it is detected by a torque sensor 18, and this is inputted to the controller. Further, the screw 28' is mainly fastened, and the main fastening loosening estimated torque T₃ necessary to loosen it is inputted to the controller. On the basis of these temporary fastening torque T₁, temporary fastening loosening torque T₂, and main fastening loosening estimated torque T₃, the main fastening torque T₅ necessary for main fastening is calculated, and the driver 22 is driven with this main fastening torque T₅ to fasten the screw 28' to the partner member.;COPYRIGHT: (C)1996,JPO