Patent ID: 8800128

Claim:
A workpiece machining method using a workpiece clamping jig, in which machining is performed on a workpiece held by vacuum suction and clamped by the workpiece clamping jig, the workpiece clamping jig comprising: a baseplate comprising a workpiece mounting surface carrying the workpiece on the top thereof, a pocket which forms an air intake passage on the reverse side of the workpiece mounting surface, and a suction through-hole internally connecting the workpiece mounting surface and the pocket; a fixed abutting member disposed on the baseplate and comprising a fixed abutting surface corresponding to the shape of the workpiece; and a movable abutting member comprising an abutting surface movable relative to the workpiece caused to abut against the fixed abutting surface, the workpiece machining method comprising: setting the baseplate on a vacuum suction table set on a table of a machine tool; machining the workpiece mounting surface of the baseplate by use of the machine tool; installing the fixed abutting member and the movable abutting member on the baseplate; machining the respective abutting surfaces of the fixed and movable abutting members by use of the machine tool; setting the workpiece on the workpiece mounting surface and clamping the workpiece by use of the fixed and movable abutting members; and machining the clamped workpiece.