Combined expansion mandrel

Abstract

The invention relates to the field of manufacturing of gears, slotting cutters, gear shaving cutters and hobbing cutters, in particular to a combined expansion mandrel used for accurately clamping parts in multi-procedure machining. The combined expansion mandrel comprises a hydraulic expansion mandrel assembly, locking nuts, an opening spring jacket and a round nut. The opening spring jacket is installed on a working mandrel section, and four symmetrically-arranged outer wings of the opening spring jacket are aligned with and penetrate into rectangular notches of the locking nuts and then rotate by a certain angle; a set screw is screwed down, so that the working mandrel section is expanded until a part is firmly clamped, and then machining of a certain procedure is started; after machining is finished, the part can be disassembled by unscrewing the set screw; and the procedures are repeated, and a series of opening spring jackets with different outer diameters are replaced for machining until all procedures are finished. By the adoption of the structure and the method, the high-precision machining requirements of the different procedures of the part can be met, large-range adjustment of the mandrel diameter size can be achieved, one mandrel has multiple purposes, and the machining cost of the part is reduced.

Description

technical field [0001] The invention relates to the field of manufacturing gears, gear shaping cutters, gear shaving cutters and hobs, in particular to a high-precision combined expansion mandrel used for precise clamping of parts to be processed in multi-process processing. Background technique [0002] Mechanical expansion mandrels and hydraulic expansion mandrels are frequently used connecting parts in the machining of gears, gear shaping cutters, shaving cutters and hobs. The mechanical expansion mandrel has a large amount of expansion, but its positioning accuracy is low, and it is difficult to ensure the machining accuracy; while the hydraulic expansion mandrel has a small expansion amount and is expensive, but its positioning accuracy is high. At present, after the rough machining of gears, gear shaping cutters, gear shaving cutters, hobs and other parts, there is a large machining allowance in the hub hole, generally several hundred microns, which needs to be process...

AI Technical Summary

Problems solved by technology

If a mechanical expansion mandrel with a large amount of expansion is used to clamp the part, one mandrel can be used to complete the machining, but because of its low positioning accuracy, it often cannot directly meet the machining accuracy requirements; although the hydraulic expansion mandrel has a high Positioning accuracy, but its maximum expansion is generally only tens of microns, and the processing allowance of hundreds of microns requires the use of multiple mandrels to complete the processing, resulting in high processing costs for parts

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