MANUFACTURING METHOD OF CAN SEAL WELD PART

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method capable of more efficiently forming a circumferential edge part of a base in a stepped recess as compared with the coining even when the thickness of the base is large. SOLUTION: In the manufacturing method of a can seal weld part for forming a weld part 4 to seal-weld a can 3 over a circumferential edge part 2 of the base 1 in the stepped recess, the base 1 the base 1 is subjected to the shearing work which generates the shearing force from the circumferential edge part 2 of the base 1 to a boundary 6 between an inner part 5 in the center direction and the circumferential edge part 2 to the thickness direction of the base. The circumferential edge part 2 of the base 1 is formed in a stepped recess by shifting the circumferential edge part in the thickness direction as compared with the inner part 5 of the circumferential edge part 2.