Caulking apparatus

A caulking apparatus that bends an end of a workpiece along a corner portion of a member by a caulking surface of a caulking roller, applies a pressure to a pressure receiving shoulder portion, which is formed opposite a bent side of the end, in a same direction as a caulking pressure applied to the caulking surface to thereby carry out a caulking process and hence form a caulked portion, and carries out a caulking process of holding the held member along a base of the workpiece by a clamping force of the caulked portion, the caulking apparatus comprising:

• a workpiece mount;
• a rolling pressurization unit that presses the workpiece arranged on the workpiece mount as the caulking roller is rolled over the workpiece;
• a caulking process load state detection unit that detects a caulking process load applied by the caulking roller;
• a specific change detection unit that detects a specific change in the caulking process load detected by the caulking process load state detection unit that indicates the member begins to be strained;
• and
• a caulking process changing unit that changes a caulking process for the workpiece based on a timing at which the specific change detection unit detects the specific change.