Manufacturing method of precision positioning mandrel

Abstract

The invention discloses a machining and manufacturing method of a precision positioning central spindle. The precision positioning central spindle is formed by assembling an elastic sleeve, a centralspindle body and pressurization inner hexagon screws. According to the working condition of the precision positioning central spindle, when a workpiece is installed on the elastic sleeve, the pressurization inner hexagon screws are screwed into the elastic sleeve, and a liquid synthetic material is pressurized through an end head; when a liquid synthetic material cavity is sealed, the pressure borne by the liquid synthetic material is uniformly acted on the elastic sleeve according to the incompressibility of liquid and the principle that the liquid can transfer pressure uniformly in all the directions, the elastic sleeve generates radial elastic deformation and makes cylindrical contact with the workpiece to enable the workpiece to be accurately positioned and reliably clamped. When a screw plunger is screwed out, the elastic sleeve returns to the original position under the action of elasticity, and the workpiece is loosened. Through the improvement on the machining method of the elastic sleeve, the central spindle body and the pressurization inner hexagon screws, the precision of the positioning central spindle is improved remarkably, and the workpiece can be prevented from being pinched in the using process.

Description

technical field [0001] The invention relates to a processing and manufacturing method for a precision positioning mandrel, in particular to a method for cylindrical grinding or finish turning of copper alloy thin-walled sleeves or other sleeve parts with an inner hole precision of IT7 to IT8 A manufacturing method for a positioning mandrel. Background technique [0002] The "wheel" of the diesel engine part is a sleeve type part, the roughness of the inner hole and the outer circle is Ra0.4, the concentricity of the inner hole and the outer circle is φ0.01mm~φ0.02mm, and the inner hole size is φ40mm (H7 grade )~φ164mm (grade H7), wall thickness 14mm~45mm, outer cylinder cylindricity φ0.01mm~φ0.02mm. [0003] The "sleeve" of diesel engine parts is a thin-walled sleeve copper alloy part. The roughness of the inner hole and the outer circle is Ra0.8, the concentricity of the inner hole and the outer circle is φ0.01mm~φ0.02mm, and the size of the inner hole is φ64.6mm (H7 grad...

AI Technical Summary

Problems solved by technology

[0005] However, due to the manufacturing accuracy, errors in machine tools and processing of traditional precision positioning mandrels, or due to factors such as poor preparation of liquid synthetic materials and unreasonable fixture structure design, the pressure transmission is uneven, which directly affects the centering accuracy of the workpiece. ;Sometimes, the workpiece is not clamped tightly and slips during processing; or the deformation of the elastic sleeve cannot be restored and the original performance is lost; even the elastic sleeve is broken and the mandrel is scrapped

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