Patent ID: 11920621
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC F  B | IPC B  F

Claim 1:
2. A fastening method for fastening a part to be fastened using a fastener including a fastener pin and a collar,
the fastener pin including a head provided on one side in an axial direction, a shank portion provided on the other side in the axial direction with respect to the head, and a lock portion provided with a lock groove that is provided on the other side in the axial direction to be further away from the shank portion,
the method comprising:
a mounting step of mounting the collar to the lock groove in a state where the head of the fastener pin is located on one side of the part to be fastened through which the fastener pin is inserted, and the lock portion of the fastener pin is located on the other side of the part to be fastened; and
a fastening step of crimping the collar to the lock groove of the lock portion to fasten the part to be fastened,
wherein a length of a portion of the collar in the axial direction, which is not crimped to the lock groove, is defined as an uncrimped portion height,
in the fastening step, the collar is crimped to the lock groove of the lock portion based on the uncrimped portion height which is set, and
when the uncrimped portion height to be set is H2,
a central value of a thickness of the part to be fastened, which corresponds to the fastener pin, is T1,
a measured value of the thickness of the part to be fastened is T2, and
an optimal value of the uncrimped portion height for the central value T1 is H1,
the uncrimped portion height H2 to be set is derived based on a calculation equation of “H2=T1−T2+H1”.