A processing system comprises a tool that processes a workpiece composed of a metal member, a motor that rotates the workpiece or the tool, a control unit that controls the motor, and a measurement unit that obtains an electrical quantity of the motor, wherein the control unit changes a rotational speed of the motor based on a difference between a first electrical quantity and a second electrical quantity, the first electrical quantity is an electrical quantity obtained by the measurement unit while the motor rotates before the workpiece is processed, and the second electrical quantity is an electrical quantity obtained by the measurement unit while the workpiece is processed.

A processing system that successively processes a plurality of workpieces includes: a tool that processes each of the workpieces; a motor that rotates the tool or each of the workpieces; a control unit that controls the motor; and a measurement unit that obtains an electrical quantity of the motor, where the control unit includes a first control unit that controls a rotational speed of the motor based on a first difference between a first electrical quantity and a second electrical quantity, the first electrical quantity is an electrical quantity obtained by the measurement unit at a specific processed portion of a first workpiece currently being processed, the second electrical quantity is an electrical quantity obtained by the measurement unit during processing of a portion of a second workpiece corresponding to the specific processed portion, and the second workpiece is a workpiece that was processed prior to the first workpiece.

The invention relates to a machine tool, hi particular a lathe grinding machine, comprising a tool spindle, a spindle motor and a tool clamped in a covet, with which tool a workpiece may be machined which may be moved in several axes relative to the tool, and comprising a control device for the tool spindle which controls the spindle motor. A spindle load detection device (24) which is connected with the control device (20) is provided and the control device (20) compares the output signal (26) of the spindle load detection device (24) with a predetermined threshold value (50), said threshold value (50) being below, in particular at least 20% below, the breaking load (54) of the tool (18). The control device (20) turns off the spindle motor (14) when the output signal (26) of the spindle load detection device (24) exceeds the threshold value (50).

The present disclosure relates to an apparatus and a method for detecting an abnormality of a tool of a machine tool, and more particularly, to an apparatus and a method for correcting backlash of a machine tool, which are capable of repeatedly measuring a load of a workpiece transferring unit or a workpiece machining unit, and automatically detecting an abnormality of a tool based on a normal range of load data that are proportional to a standard deviation of the load data measured based on any one of a mode value, a mean value, or a median value of the repeatedly measured load data.

A machining system includes, a tool configured to machine a workpiece, a motor configured to rotate the tool or the workpiece, a controller configured to control the motor, a measurement device configured to acquire a load current of the motor, the controller is configured to change a rotational speed of the motor when a Mahalanobis distance exceeds a threshold, the Mahalanobis distance is a value determined by using a parameter based on the load current acquired by the measurement device in a specific machining range of the workpiece, and the parameter based on the load current includes a parameter obtained by performing Fourier transform on the load current and a measured value of the load current.

A processing system comprises a tool that processes a workpiece composed of a metal member, a motor that rotates the workpiece or the tool, a control unit that controls the motor, and a measurement unit that obtains an electrical quantity of the motor, wherein the control unit changes a rotational speed of the motor based on a difference between a first electrical quantity and a second electrical quantity, the first electrical quantity is an electrical quantity obtained by the measurement unit while the motor rotates before the workpiece is processed, and the second electrical quantity is an electrical quantity obtained by the measurement unit while the workpiece is processed.

A machining system includes, a tool configured to machine a workpiece, a motor configured to rotate the tool or the workpiece, a controller configured to control the motor, a measurement device configured to acquire a load current of the motor, the controller is configured to change a rotational speed of the motor when a Mahalanobis distance exceeds a threshold, the Mahalanobis distance is a value determined by using a parameter based on the load current acquired by the measurement device in a specific machining range of the workpiece, and the parameter based on the load current includes a parameter obtained by performing Fourier transform on the load current and a measured value of the load current.

The invention relates to a method for monitoring a machining tool that is used for machining primarily metal materials, comprising a cutting tool, wherein the cutting force, feed force, and passive force can be adjusted during machining, and comprising sensors to measure forces. In order that machining can be stopped 2 to 60 seconds, preferably 2 to 10 seconds, prior to failure of the cutting body, the invention proposes that the sensors continuously sense at least one of said forces during machining and machining is stopped if a sudden reduction in the sensed force occurs.