Core-expanding fixture for workpiece with gullies in inner wall and using method thereof

Abstract

The invention discloses a core-expanding fixture for a workpiece with gullies in the inner wall. The core-expanding fixture comprises a concentric shaft, a limiting taper end head sleeving one side ofthe concentric shaft and a movable taper end head sleeving the other side of the concentric shaft, wherein one side, close to the movable taper end head, of the concentric shaft is provided with external threads; the external thread section of the concentric shaft is provided with a locking nut; the concentric shaft between the limiting taper end head and the movable taper end head is sleeved with a tubular expanding core; a plurality of through holes are evenly formed in the circumferences of the two sides of the expanding core; radial slide blocks are arranged in the through holes; the upper surfaces of the radial slide blocks are provided with a plurality of blind holes; and a movable block is arranged in each blind hole. The core-expanding fixture is convenient to clamp, so that the core-expanding fixture capable of clamping the workpiece quickly is especially suitable for the high-precision machining of the workpiece with the gullies, stripes, small grooves and the like on the inner walls of an aerial bomb body and the like; and in the process of clamping the expanding core, the damage to the gullies and the like on the inner wall of the aerial bomb body is small, so that theimprovement of the product qualification rate and production efficiency is facilitated.

Description

technical field [0001] The invention belongs to the technical field of core expanding fixtures, and in particular relates to a core expanding fixture 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 number of ...

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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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