Abstract: In a thermal displacement compensating device and a thermal displacement compensating method for a machine tool, a block temperature obtaining section obtains temperatures of respective blocks based on temperature information detected by temperature sensors wherein temperatures in each of the respective blocks into which a column is divided to be pluralized are defined as a uniform value. An FEM analysis section performs a structural analysis by a finite element method based on the temperatures of the respective blocks obtained by the block temperature obtaining section and infers thermal displacement amounts of the column. A compensation value calculation section calculates a compensation value for a machining command position based on the thermal displacement amounts of the column inferred by the FEM analysis section. A compensation section compensates the machining command position by the compensation value obtained by the compensation value calculation section.

Abstract: A thermal displacement correction method for a machine tool includes: estimating a thermal displacement of a support and a thermal displacement of the movable body independently of each other; acquiring a displacement of an attachment position of a scale that detects a position of the movable body; a movable body actual position acquiring step of acquiring an actual position of the movable body relative to the support after thermal deformation of the movable body; computing a degree of inclination of the movable body at the actual position; acquiring a resultant displacement that is a resultant of the thermal displacement of the support and the thermal displacement of the movable body; computing a correction value based on the resultant displacement; correcting a command position of the movable body based on the correction value.

Abstract: Temperatures of a base, a support member, and a support member are measured, and amounts of linear expansion of the base, the support member, and the support member due to temperature differences from a reference temperature are computed. An amount of linear expansion of a ball screw with respect to the support member is measured. An amount of linear expansion of a lead of the ball screw is computed based on the sum of the aforementioned amounts of linear expansion, and an amount of rotation of the ball screw is adjusted from an amount of rotation of the ball screw at the reference temperature, to an amount of rotation of the ball screw, which corresponds to the amount of linear expansion of the lead at a predetermined temperature.

Abstract: Temperatures of a base, a support member, and a support member are measured, and amounts of linear expansion of the base, the support member, and the support member due to temperature differences from a reference temperature are computed. An amount of linear expansion of a ball screw with respect to the support member is measured. An amount of linear expansion of a lead of the ball screw is computed based on the sum of the aforementioned amounts of linear expansion, and an amount of rotation of the ball screw is adjusted from an amount of rotation of the ball screw at the reference temperature, to an amount of rotation of the ball screw, which corresponds to the amount of linear expansion of the lead at a predetermined temperature.

Abstract: In a thermal displacement compensating device and a thermal displacement compensating method for a machine tool, a block temperature obtaining section obtains temperatures of respective blocks based on temperature information detected by temperature sensors wherein temperatures in each of the respective blocks into which a column is divided to be pluralized are defined as a uniform value. An FEM analysis section performs a structural analysis by a finite element method based on the temperatures of the respective blocks obtained by the block temperature obtaining section and infers thermal displacement amounts of the column. A compensation value calculation section calculates a compensation value for a machining command position based on the thermal displacement amounts of the column inferred by the FEM analysis section. A compensation section compensates the machining command position by the compensation value obtained by the compensation value calculation section.