Thermal displacement preventing device and thermal displacement preventing method of machine tool provided with ball screw

Abstract

The present invention relates to a thermal displacement preventing device and a thermal displacement preventing method of a machine tool equipped with a ball screw, which are used to prevent thermal displacement caused by mechanical friction heat between the ball screw and a bearing. The thermal displacement prevention device of the machine tool includes: a bearing (22), which is arranged on the outer periphery of the ball screw (10); a bearing seat (21), which is used to support the bearing (22); a space part (50) , which is formed on one side of the upper part of the bearing seat (21); a heating unit (30), which has an external shape corresponding to the internal shape of the space part (50); a temperature sensor (40), which is arranged on the a relative position of the heating unit (30); and a control unit (70) that controls a power supply device (80) that supplies power to the heating unit (30) based on the temperature measured by the temperature sensor (40). ) on / off (on / off).

Description

technical field [0001] The present invention relates to a thermal displacement preventing device and a thermal displacement preventing method of a machine tool equipped with a ball screw that prevents thermal displacement based on a heating unit and a temperature sensor attached to a bearing housing, and controls the power supply to the heating unit as a control unit. The on / off (on / off) of the power supply device prevents thermal displacement. Background technique [0002] In various industrial sites, various types of machine tools including turning centers and the like are widely used according to the purpose of the work. [0003] figure 1 A cross-sectional view showing a device for preventing thermal displacement in a conventional machine tool equipped with a ball screw. [0004] Such as figure 1 As shown, in general, various types of machine tools use a ball screw 10 for converting rotary motion into linear motion. Such a ball screw 10 includes a bearing 22 in contac...

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Problems solved by technology

[0007] However, in the case of such prior art, the bearing 22 that generates the most frictional heat is not directly cooled, but the bearing 22 is indirectly cooled according to the cooled ball screw. The internal cavity of the air is continuously forced into the air, which requires a lot of cost and time

[0008] In addition, when the machine tool is operated while the machine tool is stopped, that is, the ball screw is cooled, the bearing is also kept cooled. Therefore, in order to prevent thermal displacement of the workpiece, machining is not performed until the bearing reaches a certain temperature. Instead of processing objects, the machine tool is operated to perform a long-term warming up process of the machine tool, which wastes power and reduces productivity.

[0009] Furthermore, machining errors occur due to thermal displacement during precision machining

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