An adjustable hydraulic expansion mandrel and method

Abstract

The invention belongs to the technical field of precision machining and testing, and discloses an adjustable hydraulic expansion mandrel and a method thereof. These include expanding mandrels, compensating rings, workpieces, ball bushings, washers, cross washers, lock nuts, adjusting rings, set screws, connecting screws, compression screws, exhaust screws and rotary spindles. The expansion mandrel is provided with a mandrel positioning surface, an adjustment surface, a workpiece positioning surface, an expansion shaft section, a fine thread, a central hole, a pressure screw hole and an exhaust screw hole; the invention uses an adjustment ring and a set screw to adjust the expansion The radial position of the mandrel; use the compensation ring to determine the axial position of the workpiece and compensate the runout error of the end surface of the workpiece positioning surface; the expansion of the expansion shaft section makes the inner hole of the workpiece have no installation gap; the slight interference and error of the dense ball bushing are uniform The chemical effect improves the positioning accuracy of the workpiece; the expansion mandrel of the same specification realizes the positioning of workpieces with different apertures by installing dense ball sleeves with different ball diameters, which has a good market application prospect and promotion value.

Description

technical field [0001] The invention belongs to the technical field of precision machining and testing, and relates to an adjustable hydraulic expansion mandrel and a method. Background technique [0002] Using the rotary motion of the workpiece to process and test the workpiece is one of the commonly used methods in the field of precision machining and testing technology. During processing and testing, the workpiece is usually installed on the mandrel, and then the mandrel is installed on the machine tool or measuring instrument. , but considering the roundness error and cylindricity error of the inner hole and the mandrel, there is often a gap between the inner hole and the mandrel of the workpiece during installation. The expansion mandrel clamps the workpiece through expansion, and the clamping force and clamping accuracy are extremely high. Under the balanced pressure, the expansion sleeve can expand or contract evenly along the geometric axis; in the case of clamping, ...

AI Technical Summary

Problems solved by technology

These published patents all use the central hole as a reference or use chucks and flanges to fix the expansion mandrel. Although the gapless positioning of the inner hole of the workpiece can be realized, the positioning accuracy depends on the accuracy of the center hole of the expansion mandrel and the corresponding position. There is still room for improvement in the precision of the top-notch, the manufacturing precision of the mandrel itself, the expansion precision of the mandrel, and the precision of the inner hole of the workpiece.

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