Machine tool

Patent metadata

Field	Value
Publication number	US-11787003-B2
Application number	US-202016792445-A
Country	US
Kind code	B2
Filing date	Feb 17, 2020
Priority date	Apr 2, 2019
Publication date	Oct 17, 2023
Grant date	Oct 17, 2023

Abstract

This machine tool includes a spindle, a workpiece support section that supports the workpiece, a servo motor that rotates or moves workpiece support section relative to the spindle, and a control device that controls the servo motor, where the control device displays an adjustment screen for adjustment of at least either of a gain and a filter of the servo motor on a display device when the control device recognizes that the servo motor is newly mounted, when a machining program of the workpiece is changed, or when an operation value of the servo motor or a value calculated based on the operation value deviates from a predetermined criterion.

First claim

The invention claimed is:

1. A machine tool comprising:
a spindle to which a tool is attached;
a workpiece support section that supports a workpiece;
a servo motor that rotates or moves the workpiece support section relative to the spindle; and
a control device that controls the servo motor when machining of the workpiece is performed by the tool, wherein
the control device displays an adjustment screen for adjustment of at least one of a gain and a filter of the servo motor on a display device when the control device recognizes that the servo motor is newly mounted or when a machining program of the workpiece is changed or the control device displays an indication for guidance which guides an operator to the adjustment screen on the display device when the control device recognizes that the servo motor is newly mounted, when a machining program of the workpiece is changed.

2. The machine tool according to claim 1 , wherein the workpiece support section is a rotating table having one or more rotation axes, and an output shaft of the servo motor is connected to the rotating table without a decelerator.

3. The machine tool according to claim 2 , wherein the operation value is a value associated with operation of the servo motor when a rotation command is issued to the servo motor, or a value associated with operation of the servo motor when a command of clamping or unclamping is issued to the servo motor or the rotating table.

4. The machine tool according to claim 2 , wherein the value calculated based on the operation value is inertia of a portion that includes at least the workpiece or the workpiece support section.

5. A machine tool comprising:
a spindle to which a tool is attached;
a workpiece support section that supports a workpiece;
a servo motor that rotates or moves the workpiece support section relative to the spindle; and
a control device that controls the servo motor when machining of the workpiece is performed by the tool, wherein
the control device displays an adjustment screen for adjustment of either of a gain and a filter of the servo motor on a display device or displays an indication for guidance which guides an operator to the adjustment screen on the display device when the control device recognizes that the servo motor is newly mounted, when a machining program of the workpiece is changed, or when an operation value of the servo motor or a value calculated based on the operation value deviates from a predetermined criterion, wherein
the control device has an automatic adjustment program that performs automatic adjustment of the gain and the filter of the servo motor, and
the automatic adjustment program causes the control device to execute:
making the servo motor perform a first motion to perform adjustment to adjust the gain and the filter;
making the servo motor perform a second motion using the gain and the filter adjusted in the adjustment to perform calculation for determining inertia of a portion that includes at least the workpiece or the workpiece support section; and
time constant adjustment in accordance with the inertia estimated by the calculation.

6. The machine tool according to claim 5 , wherein the control device stores the results of adjustment of the gain and the filter in a storage in such a manner that the results correspond to types of the workpiece.

7. The machine tool according to claim 5 , wherein the control device transmits the results of adjustment of the gain and the filter for use in another machine tool.

8. A machine tool comprising:
a spindle to which a tool is attached;
a workpiece support section that supports a workpiece;
a servo motor that rotates or moves the workpiece support section relative to the spindle; and
a control device that controls the servo motor when machining of the workpiece is performed by the tool, wherein
the control device displays an adjustment screen for adjustment of either of a gain and a filter of the servo motor on a display device or displays an indication for guidance which guides an operator to the adjustment screen on the display device when the control device recognizes that the servo motor is newly mounted, when a machining program of the workpiece is changed, or when an operation value of the servo motor or a value calculated based on the operation value deviates from a predetermined criterion, wherein
the control device is configured to receive a mounting signal when connection between the servo motor and the control device is made, the mounting signal indicating that the connection is made, and
the control device causes the display device to display a screen for initial settings including pole position detection of the newly mounted servo motor, and then causes the display device to display the adjustment screen or display the indication for guidance which guides the operator to the adjustment screen.

Assignees

• Fanuc Corp

Inventors

• Tachiki Shingo

Classifications

• B23Q5/12 Primary

  Mechanical drives with means for varying the speed ratio · CPC title

• G05B19/4163

  Adaptive control of feed or cutting velocity (without NC B23Q15/12) · CPC title

• B23Q15/007 Primary

  while the tool acts upon the workpiece · CPC title

• G05B19/409 Primary

  characterised by using manual data input [MDI] or by using control panel, e.g. controlling functions with the panel; characterised by control panel details or by setting parameters (G05B19/408, G05B19/4093 take precedence) · CPC title

• B23Q15/12 Primary

  Adaptive control, i.e. adjusting itself to have a performance which is optimum according to a preassigned criterion · CPC title