Expanding core fixture capable of reducing damage to workpiece inner wall and using method thereof

Abstract

The invention discloses an expanding core clamp capable of reducing workpiece inner wall damage. The expanding core clamp comprises a concentric shaft, a limiting taper end tip, a movable taper end tip and a gasket group; the limiting taper end tip is fixedly arranged on the concentric shaft; the movable taper end tip can slide along the concentric shaft; a tubular taper expanding core sleeves a part, between the limiting taper end tip and the movable taper end tip, of the concentric shaft; the side wall, which is close to the taper end tip, of the taper expanding core is uniformly provided with a plurality of through holes along the circumferential direction; a radial sliding block is arranged in each through hole; a plurality of rectangular groove holes are formed in the surface of eachradial sliding block; a spring is fixedly arranged on the bottom of each rectangular groove hole; a sliding block is fixedly arranged on the top of each spring; and a quasi-semi-circular auxiliary fixing sheet is arranged on each sliding block. The expanding core clamp is especially applicable to high-precision machining of aerial bomb bodies and other workpieces of which the inner walls are provided with ditches; and during a core expanding clamping process, damage to the inner wall ditches, pineapple wedges and the like of the aerial bomb bodies is small, so that the qualification rate and production efficiency of products are favorably improved.

Description

technical field [0001] The invention belongs to the technical field of core-expanding fixtures, and in particular relates to a core-expanding fixture capable of reducing damage to the inner wall of a workpiece and a use method thereof. Background technique [0002] In the processing of some tubular parts, the precision is extremely high. Taking the aerial bomb as an example, in the processing and production of the shell of the aerial bomb, the processing precision of the shell of some aerial bombs is extremely high, so as to ensure that the bomb enters and exits. The smooth operation of the magazine, release, launch or explosion requires the machining accuracy error of the shell to be within the millimeter level. [0003] The shape of the shell of the aerial bomb shell is mostly a curve that adapts to the fluid mechanics. In order to ensure the integrity of the outer wall of the shell, in the CNC turning process, it is necessary to cut out the shape of the shell from the beg...

AI Technical Summary

Problems solved by technology

[0004] In addition, if the ordinary two ends are fixed in opposite directions, due to the difference in the diameter of the inner cavity of the shell of the aerial bomb shell, the coaxiality between the shell of the aerial bomb shell and its inner cavity is often low, resulting in the problem of unqualified products.

[0005] Moreover, due to the higher and higher processing precision requirements in production orders, the product failure rate is getting higher and higher. After investigation, it is found that the current expanding core fixtures cannot meet the current processing needs due to the difficulty in ensuring high coaxiality.

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