Mori Seiki Co., Ltd.

Mitsubishi Electric Corporation

Dmg Mori Seiki Co., Ltd.

Mitsubushi Electric Corporation

Munetaka Wakizaka

Hiroshi Mizuguchi

Masaaki Yokoyama

Takeshi Tsuda

Tsuyoshi Kumazawa

Kazutada Hashimoto

Hideaki Hiramitsu

Mikio Iwakiri

A numerical control device reads a machining program and causes a machine tool to operate based on the machining program. The numerical control device includes: an acceleration-deceleration determining unit; and a position-command generating unit. The numerical control device is configured to set the acceleration and the deceleration as acceleration-deceleration data when the acceleration and the deceleration satisfy tolerances decided based on actual mechanical dynamic characteristics, and set the tolerances as acceleration-deceleration data when the acceleration and deceleration do not satisfy the tolerances. The position-command generating unit is configured to generate a position command based on the moving command, the acceleration-deceleration data, and the speed at the end of the command route and the superimposition amount subjected to processing by the acceleration-deceleration determining unit.

Machining program creating device numerical control device, machining system, machining program creating method, numerical control method, and machining program

In a rotation angle positioning deviceincluding: a rotation angle detection devicewhich has a detection target ringand an angle detection sensor; and a rotating-shaft driving devicerotating a rotating shaft so as to cause a rotation angle to become a given command value &#x3b1; for rotation angle, there are provided: an error pattern storage unitstoring a tooth-to-tooth period error pattern F made up of errors between detected rotation angles by the angle detection sensorand actual rotation angles, corresponding to respective correction dividing points of an arbitrary tooth-to-tooth period in the detection target ring; and a command value correction unitcorrecting the command value &#x3b1; for rotation angle based on the tooth-to-tooth period error pattern F to find a corrected command value &#x3b1;for rotation angle.

Rotation angle positioning device

A method and apparatus by which accurate correction values for thermal displacement is calculated even when the rotation of the main spindle is restarted after interruption. The apparatus has means for measuring the temperature near the main spindle means for estimating the thermal displacement of the main spindle on the basis of the measured temperature and a predetermined thermal displacement calculation expression, means for calculating the correction value, and means which estimates the displacement delay in re-rotation caused by the interruption of the rotation of the main spindle and calculates an adjusting displacement on the basis of the estimated displacement delay. The correction value calculating means calculates a correction value on the basis of the thermal displacement estimated by the thermal displacement estimating means alone when the main spindle is started up and rotated.

Method and apparatus for calculating correction value for thermal displacement in machine tool

The present invention provides a numerical control apparatus for a machine tool, which corrects an axial displacement of a main spindle caused due to a change in preload level and occurring according to the rotation speed of the main spindle. The numerical control apparatus ( ) comprises: a numerical control section ( ) for numerically controlling the movement of a spindle head ( ) and for outputting a rotation command; a spindle control section ( ) for controlling the rotation of a main spindle ( ); a preload change control section ( ) for changing the level of a preload applied to bearings ( ); and a correcting section ( ) for outputting correction data for correction of an axial displacement of the main spindle ( ) caused due to a change in the preload level and occurring according to the rotation speed of the main spindle ( ) to the numerical control section ( ) on the basis of the rotation command.

Numerical control apparatus for machine tool

Growing community of inventors

Yamatokoriyama, Japan

Munetaka Wakizaka