Grinding-bed static head rack capable of realizing accurate ultra micro-finishing

Abstract

The invention relates to a static head frame of a grinding machine, which can realize precise and super-precise grinding, comprising a sleeve, a head frame spindle, a support box body, a head frame tip which is arranged on the front end of the head frame spindle and a head frame motor which is connected with the back end of the head frame spindle; wherein, the sleeve is positioned on the support box body; a front end cover is arranged at the front end of the sleeve; the front end and the back end of the head frame spindle are respectively supported on the sleeve through a front liquid hydrostatic bearing and a back liquid hydrostatic bearing; liquid medium is filled between the head frame spindle and both the front liquid hydrostatic bearing and the back liquid hydrostatic bearing; a thrust shaft shoulder is arranged on the head frame spindle and sleeved with a circle of gasket; the thrust shaft shoulder and the gasket are both positioned between the front liquid hydrostatic bearing and the front end cover; a front end gap exists between the front end of the thrust shaft shoulder and the front end cover and a back end gap exists between the back end of the thrust shaft shoulder and the front liquid hydrostatic bearing; and liquid medium is filled in the front end gap and the back end gap to form a liquid hydrostatic thrust bearing. The head frame has the advantages of good rigidity, high rotation accuracy, good vibration reducing performance and long precision life.

Description

technical field [0001] The invention relates to the field of mechanical manufacturing, in particular to a grinding machine static headstock for ultra-precision grinding. Background technique [0002] Precision and ultra-precision grinding is a key technology within the field of advanced machine building technology. As the requirements for machining accuracy and machining efficiency of parts are getting higher and higher, many developed countries in the world have included the research and development of precision and ultra-precision grinding equipment in the technology and industrial development direction supported by the state. Compared with ordinary processing equipment, precision and ultra-precision grinding equipment have higher requirements on the rigidity of the bed, the rigidity and rotation accuracy of the grinding wheel spindle, and the rigidity and rotation accuracy of the workpiece installation. [0003] At present, most of the grinding machines produced in China...

AI Technical Summary

Problems solved by technology

Due to the objective existence of wear between the rolling elements and the inner and outer rings of rolling bearings, the bearing clearance is prone to change after long-term operation. Therefore, when the headstock spindle supported by rolling bearings drives the workpiece to rotate, the rotation accuracy of the workpiece will be reduced, resulting in The surface profile accuracy of the grinding wheel grinding workpiece decreases and the surface roughness increases

Thin oil-lubricated copper tile sliding bearing support structure, because the supply and return of thin oil are completely open, it is difficult to form a stable high-rigidity oil film pressure, which leads to the head of the thin oil-lubricated copper tile sliding bearing support structure When the rack spindle drives the workpiece to rotate, the supporting rigidity of the workpiece is low, which affects the improvement of the surface quality of the workpiece ground by the grinding wheel

Due to the above-mentioned defects of the existing headstock spindle in the two aspects of supporting elements and transmission mode, the rigidity of the grinding machine headstock is small and the rotation accuracy is low, which limits the further improvement of the machining accuracy of the existing grinding equipment

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