Large-stroke internal expanding clamp for machining long hollow shaft

Abstract

The invention provides a large-stroke internal expanding clamp for machining a long hollow shaft. The large-stroke internal expanding clamp comprises a hydraulic chuck, a positioning body, clamping jaws, a pull rod and a hollow shaft workpiece; a tubular hollow structure is arranged inside the positioning body; a plurality of penetrating openings are evenly formed in the outer side face of the tubular hollow structure; clamping blocks are arranged at the end parts, extending into the inside of the positioning body, of the clamping jaws; the clamping blocks extend out of the penetrating openings; the inner side faces of the clamping blocks are set as first conical faces; a movable block is arranged at the bottom of the pull rod; the outer side face of the movable block is set as a second conical face; and the pull rod and the clamping blocks can be clamped in a matched mode. The large-stroke internal expanding clamp has the advantages of simple structure, ingenious design, increase of aclamping stroke, difficulty in deformation, difficulty in damage, convenience for clamping and fixing and the like.

Description

technical field [0001] The invention belongs to the field of numerical control, in particular to a large-stroke internal expansion fixture used for processing long hollow shafts. Background technique [0002] At present, there are two kinds of internal expansion clamping methods for hollow shafts in China. The first is the three-jaw internal expansion structure. The disadvantage of this structure is that it can only process hollow shafts with shorter lengths, because the longer the jaws, the worse the rigidity. . The second is the expansion sleeve structure. The disadvantage of this structure is that it is limited by the clamping stroke of the expansion sleeve, because if the clamping stroke is large, the expansion sleeve is easily damaged or deformed. When processing hollow shafts with a long length and a large clamping stroke, the limitations of the above two structures are exposed. [0003] Because this kind of phenomenon belongs to a limitation of the numerical control...

AI Technical Summary

Problems solved by technology

[0002] At present, there are two kinds of internal expansion clamping methods for hollow shafts in China. The first is the three-jaw internal expansion structure. The disadvantage of this structure is that it can only process hollow shafts with shorter lengths, because the longer the jaws, the worse the rigidity.

The second is the expansion sleeve structure. The disadvantage of this structure is that it is limited by the clamping stroke of the expansion sleeve, because if the clamping stroke is large, the expansion sleeve is easily damaged or deformed.

[0003] Because this kind of phenomenon belongs to a limitation of the CNC internal expansion fixture, it is difficult to completely avoid it in the production process

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