Expanding core fixture suitable for workpiece with gully on inner wall and use method thereof

Abstract

The invention discloses an expanding core fixture suitable for a workpiece with a gully on the inner wall. The fixture comprises a concentric shaft, a limiting taper end sleeving one side of the concentric shaft, and a movable taper end sleeving the other side of the concentric shaft; a taper expansion core sleeves the concentric shaft between the limiting taper end and the movable taper end; a plurality of slits are uniformly formed in the two sides of the taper expansion core along the length direction; the taper expansion core is divided by the slits into a first expansion core petal groupnear the limiting taper end and a second expansion core petal group near the movable taper end; a plurality of blind holes are formed in the upper surfaces of the first expanding core petal group andthe second expanding core petal group; and a permanent magnet piece and a movable block are arranged in each blind hole. The fixture is convenient to clamp and operate, can complete clamping the workpiece quickly, and is particularly suitable for high-precision machining of workpieces with grooves, stripes, small grooves and the like on the inner walls of aerial bombs and the like; and damage to the grooves on the inner walls of the aerial bombs and the like in the expanding core clamping process is small, so that the product qualification rate and the production efficiency are improved advantageously.

Description

technical field [0001] The invention belongs to the technical field of core expanding fixtures, and in particular relates to a core expanding fixture suitable for workpieces with gullies on the inner wall 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] In the processing and production of the shell of the aerial bomb shell, the inner cavity is usually processed on the blank first; the inner cavity is turned into a cylindrical shape with constant or gradual diameter according to the processing requirements. A n...

AI Technical Summary

Problems solved by technology

[0005] 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.

[0006] 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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