Hydrostatic bearing and hydrostatic guide rail assembly

Abstract

The invention discloses a hydrostatic bearing and a hydrostatic guide rail assembly. The hydrostatic bearing comprises a supporting block, a cover plate, a bearing piston, a bearing disc, an elastic element and a throttler, wherein an auxiliary cavity is formed in the upper portion of the supporting block, a main cavity is formed in the lower portion of the supporting block, and the auxiliary cavity communicates with the main cavity; the cover plate covers the supporting block and is provided with an open hole communicating with the auxiliary cavity; the bearing piston is contained in the auxiliary cavity; the bearing disc is connected with the top of the bearing piston extending out of the open hole and used for bearing external loads; the elastic element is arranged in the auxiliary cavity, one end of the elastic element abuts against the bearing piston, and the other end of the elastic element abuts against the bottom face of the cover plate; and the throttler is installed in the supporting block, an outlet of the throttler communicates with a first channel through a second channel, and an inlet of the throttler communicates with external oil supply equipment. According to the hydrostatic bearing and the hydrostatic guide rail assembly, small hole throttling is combined with a piston type displacement self-compensation structure, so that when the bearing force borne by the hydrostatic bearing changes, rapid response can be achieved, the hydrostatic bearing can return to the original position within a short time, and then quasi-infinite rigidity is achieved.

Description

technical field [0001] The invention relates to the field of static pressure technology, in particular to a static pressure bearing and a static pressure guide rail assembly. Background technique [0002] Hydrostatic thrust bearings have been widely used in high-speed, heavy-duty, ultra-precision machine tool guide rails and spindles due to their superior performance of high bearing capacity, high stiffness, and high damping. Its stiffness coefficient has always been one of the important parameters for evaluating the dynamic performance of machine tools. one. [0003] As machine tools continue to develop towards high precision, hydrostatic bearing technology is also facing new challenges. Under extreme processing conditions such as ultra-precision heavy-duty hard turning and hard milling, the dynamic performance of hydrostatic bearings cannot meet the processing requirements under strong disturbances such as cutting forces. [0004] Therefore, in order to improve the rigid...

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Problems solved by technology

Under extreme processing conditions such as ultra-precision heavy-duty hard turning and hard milling, the dynamic performance of hydrostatic bearings under strong disturbances such as cutting forces cannot meet processing requirements

[0004] Therefore, in order to improve the rigidity of the hydrostatic bearing, a variety of optimization schemes have been proposed, such as the use of a diaphragm throttle, so as to achieve passive compensation of the oil film pressure and improve the stiffness at the same time, but the compensation time delay is relatively long. And it is difficult to accurately control, short life, and high cost; or a piezoelectric actuator is installed on the oil sealing side to actively compensate the oil film according to pressure feedback, but the control algorithm of this scheme is complicated and difficult to implement; or in the oil Adding magnetic materials makes the fluid exhibit special properties under a magnetic field to improve the supporting performance of the oil film, but it also has problems such as difficulty in precise control

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