High-precision pneumatic chuck structure

Abstract

The invention relates to a high-precision pneumatic chuck structure. The high-precision pneumatic chuck structure is arranged on a flange plate of a machine tool and comprises a rotating shaft fixedlyconnected with the flange plate, a pneumatic assembly arranged at the front portion of the rotating shaft, a chuck assembly arranged on the pneumatic assembly and a ventilation bearing arranged at the rear portion of the rotating shaft, wherein the ventilation bearing is an aerostatic bearing; a ventilation groove is arranged in the rotating shaft; the ventilation groove communicates with the pneumatic assembly and the aerostatic bearing; one part of the air introduced by the aerostatic bearing forms an air film in the aerostatic bearing; and the other part of the air enters the pneumatic assembly through the ventilation groove to drive the chuck assembly. Due to the homogenization effect of the air film, the rotation precision can be further improved, and the influence of the shape errorof the mechanical bearing on the rotation precision and the rotation stability of a chuck is greatly reduced; and meanwhile, in the aerostatic bearing, a rotary part of the chuck is separated from astatic part by the air film, and direct contact of mechanical parts is avoided, so that friction force in operation is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of production and manufacture of machine tool chucks, in particular to a high-precision pneumatic chuck structure. Background technique [0002] Pneumatic chuck is a mechanical device that uses the radial movement of movable jaws evenly distributed on the chuck to clamp the workpiece. It is often installed on lathes, internal grinding machines and cylindrical grinding machines. With the development of ultra-precision machining and manufacturing technology, many high-tech products have higher and higher requirements for the machining accuracy of ultra-precision machining machine tools. Pneumatic chucks have the advantages of high clamping efficiency, high clamping accuracy, and simple chuck structure. It is widely used in high-precision turning and grinding. [0003] The rotation of the chuck is driven by the connection between the flange and the workpiece spindle. The external compressed air source enters t...

AI Technical Summary

Problems solved by technology

[0004] Traditional contact rolling bearings are widely used in pneumatic chucks to reduce the friction between their stationary and rotating parts. Due to their own structure, it is difficult for traditional contact bearings to achieve extremely high machining accuracy, resulting in vibration during rotation Thereby reducing the rotation accuracy of the chuck

Crawling will occur during low-speed operation, and during long-term high-speed rotation, the thermal deformation of the chuck part caused by the frictional heat of the bearing will also reduce the rotation accuracy of the workpiece end

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