Method for determing the machining quality of components, particularly for metal cutting by nc machines

A method for determining a selected machining quality of components in a manufacturing process, particularly during metal cutting, having at least the following method steps:

• determining process-relevant variables by sensors and/or from the data stream in the machine controller and
• extracting variable curves characteristic for the respective machining process, characterized by
• selecting a number of different characteristics of the extracted variable curves, with the characteristic variable curves being divided into a number of sections, with the respective lengths of the sections, the linear regression coefficients, and the variance of the residues around the regression lines being selected as characteristics, and
• multivariate linking of the selected characteristics to a characteristic pattern correlating with the selected machining quality, characterized in
• that
• the motor currents, the rotational speeds, and/or the cutting forces are determined as process-relevant variables.