Control system of machine tool

A control system of a machine tool which machines a work, the control system comprising:

• a control device including a processor which controls a drive axis of the machine tool based on chronological control data;
• a machined surface measurement device which measures a machined surface of the work;
• and
• a data processing device,
• wherein the data processing device includes another processor which:
• acquires, from the control device, the chronological control data when the work is machined;
• acquires spatial machined surface measurement data after the machining of the work measured by the machined surface measurement device;
• and
• associates the acquired chronological control data and the acquired spatial machined surface measurement data with each other,
• the chronological control data is torque information of the drive axis of the machine tool, and
• the another processor of the data processing device:
• detects, based on a variation in chronological torque information, as an edge position of the work, a machining start position and a machining completion position so as to produce a first work shape image;
• and
• detects, based on the spatial machined surface measurement data, an edge position of the work so as to produce a second work shape image, and
• wherein the associating comprises superimposing the edge position of the first work shape image and the edge position of the second work shape image on each other, and
• wherein the another processor of the data processing device further:
• detects a failure in machining process, on the machined surface of the work and a failure location based on the acquired spatial machined surface measurement data;
• and
• identifies, based on the superimposed first and second work shape images, chronological control data, which is control data that controls the drive axis at the moment when the failure in machining process occurs.

A control system of a machine tool which machines a work, the control system comprising:

• a control device including a processor which controls a drive axis of the machine tool based on chronological control data;
• a machined surface measurement device which measures a machined surface of the work;
• and
• a data processing device,
• wherein the data processing device includes another processor which:
• acquires, from the control device, the chronological control data when the work is machined;
• acquires spatial machined surface measurement data after the machining of the work measured by the machined surface measurement device;
• and
• associates the acquired chronological control data and the acquired spatial machined surface measurement data with each other,
• the chronological control data is torque information of the drive axis of the machine tool, and
• the another processor of the data processing device:
• detects, based on a variation in chronological load information obtained by subtracting a torque part for at least one of acceleration and deceleration from chronological torque information, as an edge position of the work, a machining start position and a machining completion position so as to produce a first work shape image;
• and
• detects, based on the spatial machined surface measurement data, an edge position of the work so as to produce a second work shape image and
• wherein the associating comprises superimposing the edge position of the first work shape image and the edge position of the second work shape image on each other, and
• wherein the another processor of the data processing device further:
• detects a failure in machining process, on the machined surface of the work and a failure location based on the acquired spatial machined surface measurement data;
• and
• identifies, based on the superimposed first and second work shape images, chronological control data, which is control data that controls the drive axis at the moment when the failure in machining process occurs.