Method for evaluating tool health with the temperature rising signal

A method for evaluating tool health with the temperature rising signal, executed by a processor that applied to a machine tool to utilize a tool to perform a removal process upon a workpiece, comprising the steps of:

• setting a target machining instruction, wherein the target machining instruction is used to perform a target machining depth Dt;
• utilizing the processor to divide the target machining instruction into a residual machining instruction and a micro machining instruction, wherein the residual machining instruction is used to perform a residual machining depth Dr, the micro machining instruction is used to perform a micro machining depth Dm, the micro machining depth Dm is equal to or greater than a minimum unit displacement of the tool, and Dt=Dr+Dm;
• performing the residual machining instruction;
• with or without any coolant, performing the micro machining instruction, and having at least one thermal image sensor to detect a thermal image of a contact area of the tool and the workpiece;
• having the processor to derive a temperature feature by evaluating the thermal image;
• and
• having the processor to compare the temperature feature with at least one threshold for determining the tool health;
• wherein the thermal image sensor divides the contact area of the tool and workpiece into sections, and the thermal image is detected at each of the sections.