Workpiece clamping tool for numerical control plane milling and grinding machine and operation method

The invention relates to the technical field of milling and grinding machines, in particular to a workpiece clamping tool for a numerical control plane milling and grinding machine and an operation method.The workpiece clamping tool comprises a base, and a bearing plate is arranged on the surface of the base; a notch is formed in the surface of the replacement plate, a fixing groove is formed in the surface of the replacement plate, a fixing plate is arranged in the fixing groove, a clamping assembly is fixed to the surface of the fixing plate, a telescopic rod is fixed to the surface of the replacement plate, and an inserting block is fixed to the surface of the replacement plate; and the first lifting rod is arranged at the top of the base. The part replacement device has the beneficial effects that a part is placed at the top of a bearing plate, a fixing plate on the surface of a clamping assembly is inserted into a fixing groove and fixed through a screw, a second lifting rod moves downwards to enable a r