Liquid expansion type precision grinding tool for inner hole

Abstract

The invention belongs to the technical field of precision machining and provides a liquid expansion type precision grinding tool for an inner hole. The liquid expansion type precision grinding tool comprises a plunger nut, two sets of O-shaped seal rings, two sets of Y-shaped seal rings, an expansion sleeve, a grinding shaft sleeve, a plunger screw and an oil plug. According to the grinding tool, a thin-walled hydraulic expansion mandrel is used as a driving element for the radial deformation of the cylindrical thin-walled grinding shaft sleeve, a distance between the plunger screw and the plunger nut is reduced by tightening the plunger screw, the pressure intensity of hydraulic oil in a cavity of the expansion mandrel increases, the radial deformation of the thin-walled elastic expansion sleeve is caused, and the radial expansion of the cylindrical elastic grinding shaft sleeve is accordingly driven, so that the precision grinding of the inner hole with a bulging tendency is realized. The grinding tool can be operated on a lathe, has the advantages that the structure is simple, the grinding shaft sleeve is changeable, the operation is convenient, the inner hole grinding precision is high, saddle-shaped error cannot be produced, and the like, can meet the superhigh precision grinding requirement of the inner hole, and has great market application prospects and popularization value.

Description

technical field [0001] The invention belongs to the technical field of precision machining, and relates to a liquid expansion type inner hole precision grinding tool. Background technique [0002] Grinding is an ultra-precision machining process, which is mainly used for ultra-precision machining of surfaces composed of simple geometric elements such as planes, cylinders, and spheres. At present, the flatness of plane grinding can generally reach 0.2-0.5 μm; the roundness of cylindrical surface grinding can generally reach 0.2-0.5 μm, and the cylindricity can generally reach 0.5-1 μm. Inner hole grinding requires an elastic bushing whose outer diameter is slightly smaller than the inner diameter of the workpiece and whose outer diameter can be fine-tuned within a certain range. The traditional inner hole grinding tooling mostly adopts the relative movement of the shaft and the hole with a single conical surface or a double conical surface, and uses the radial component of t...

AI Technical Summary

Problems solved by technology

From the perspective of the use of inner holes, the high-precision inner holes on parts are mainly used as benchmarks for processing or testing. Therefore, under a certain degree of cylindricity, cylindrical and drum-shaped inner holes are easier to obtain high installation and positioning accuracy. , on the contrary, the positioning accuracy of the conical and saddle-shaped inner holes is poor

The inner hole processed by the traditional inner hole grinding tool is very prone to conical error and saddle error. Under the same cylindricity, such errors reduce the installation and positioning accuracy of the inner hole

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