Yamazaki Mazak Corporation

Makoto Tanahashi

Yasuhiko Suzuki

Tomohisa Yamazaki

Masahiro Kurata

Jun Igarashi

Isao Adachi

Katsuki Sugiura

Kiyoyuki Okuyama

A machine tool includes a tool attachment device, a workpiece attachment device, a controller, a mode selector, an axis selector, a cover, a window, and a manual operation auxiliary display device. The controller is configured to control movements of at least one of the tool attachment device and the workpiece attachment device with respect to a target axis. The mode selector is configured to select a manual operation mode or an automatic operation mode. The axis selector is to select the target axis among a plurality of axes in a case where the mode selector selects the manual operation mode. The manual operation auxiliary display device is configured to display directions of the plurality of axes included in the machine tool as an axis configuration model in the window in a case where the manual operation mode is selected.

Machine tool

Cover for an indicator lamp

A machine tool moves a driven member by use of a servomotor. A position control device controls the position of the driven member in accordance with full closed loop control. The position control device computes an integrated feedback value g in correspondence with a function F (V, P, V, P) in which four state amounts, motor speed V, motor position P, driven member speed V, and driven member position Pare independent variables. The thrust instruction &#x3c4;*, which is inputted to the servomotor, is compensated with the integrated feedback value g. The servomotor is thus optimally driven and controlled in accordance with full closed loop control.

Position control device and position control method for machine tools

A method corrects thermal displacement of a machine tool having a rotational spindle. The method includes detecting a rotation speed of the spindle. A thermal displacement amount of the spindle in the current cycle of execution of a program is estimated by using an arithmetic expression that is based at least on the spindle rotation speed and a thermal displacement amount that has been estimated in the preceding cycle of execution of the program. The estimated thermal displacement amount in the current cycle is used as a correction amount for canceling the thermal displacement of the spindle. Therefore, thermal displacement of a machine tool is corrected with no complicated processes when a spindle rotation speed changes.

Method and apparatus for correcting thermal displacement of machine tool

When a command radius r of a circular interpolation control exceeds a threshold value, a computer computes a speed limit for the circular speed at which the acceleration becomes constant. When the command radius r of the circular interpolation control is less than or equal to the threshold value, the computercomputes another speed limit for the circular speed at which r&#x3c9;or r&#x3c9;becomes constant, where &#x3c9; is the angular frequency. The computer performs the circular interpolation control by safeguarding the circular speed from exceeding one of the speed limits in accordance with the command radius r of the circular interpolation control.

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Aichi-pref., Japan

Makoto Tanahashi