Five-axis machining center main shaft thermal offset testing method

The invention relates to the technical field of machining, and provides a five-axis machining center spindle thermal offset testing method. The invention provides a five-axis machining center main shaft thermal offset testing method which comprises the following steps: under the condition of not using cooling liquid, processing a first workpiece according to preset processing parameters so as to process a first measurement step surface; after the first measurement step surface is machined, machining a second workpiece according to preset machining parameters under the condition that cooling liquid is used so as to machine a second measurement step surface; after the second workpiece is machined, the distances of the first measurement step surface of the first workpiece in the X-axis direction and the Y-axis direction and the distances of the second measurement step surface of the second workpiece in the X-axis direction and the Y-axis direction are measured respectively; and calculating a deviation value in t