| 摘要 |
PROBLEM TO BE SOLVED: To provide a method to directly control axial force by computing the axial force generated by impact force by using an impact wrench as a torque method requires estimation of a torque coefficient and has a difficult point that a computed axial force value also becomes an estimated value though a control method such as the torque method, etc. is conventionally used for screw fastening axial force control. SOLUTION: A 45 degree line is set from an original point 0 of an orthogonal coordinate axis used for axial force control of screw fastening, an impact proceeding point H<SB>i</SB>generated by No. (i) impact is detected on the 45 degree line, length HS<SB>i</SB>of a line segment 0H<SB>i</SB>is read and an axial force value F<SB>i</SB>after generation of the No. (i) impact is computed by using an expression: F<SB>i</SB>=HS<SB>i</SB>×cos45°. COPYRIGHT: (C)2008,JPO&INPIT
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