Method and device for validating a set of operating parameters of a machine tool, in particular for a milling operation

A method for validating a set of operating parameters of a machine tool, the machine tool comprising a milling tool to carry out a milling operation of a workpiece to be machined, the method comprising at least a series of steps of:

• an acquisition step which involves acquiring a set of input data comprising at least:
• a set of operating parameters to be validated, comprising parameters which are linked to the machine tool and parameters which are linked to the milling tool;
• and
• a set of additional parameters relating to features of the milling tool and the workpiece to be machined;
• a milling step which involves producing, using the milling tool, at least one reference milling of a first master workpiece which is representative of the workpiece to be machined, and measuring values of the machining forces which are applied by the milling tool to the first master workpiece;
• a first data-processing step which involves determining, from at least some data of the set of input data and the values of the machining forces measured in the milling step, specific force coefficients which are representative of the machining forces;
• an orthogonal cutting step which involves carrying out, using the milling tool, at least one orthogonal cut of a second master workpiece which is representative of the workpiece to be machined, and measuring at least values of the geometric sizes which are linked to a reference chip which is generated during the orthogonal cut;
• and
• a second data-processing step comprising at least:
• a first calculation sub-step which involves calculating, from at least some data from the set of input data, at least one of the specific force coefficients and the values of the geometric sizes measured in the orthogonal cutting step, a tertiary thermal flux which is generated in a tertiary shearing zone of the second master workpiece during the orthogonal cut;
• a second calculation sub-step which involves calculating, from the tertiary thermal flux, a final temperature which is representative of a maximum temperature in a region of a machined surface of the second master workpiece during the orthogonal cut;
• and
• a comparison sub-step which involves comparing the final temperature with a critical temperature and:
• rejecting the set of operating parameters if the final temperature is greater than or equal to the critical temperature;
• and
• validating the set of operating parameters if the final temperature is lower than the critical temperature.