Core expansion fixture with spacer and method of use thereof

Abstract

The invention discloses an expansion core clamp with a gasket. The expansion core clamp comprises a concentric shaft, a limiting taper end head, a movable taper end head and a gasket set. The limitingtaper end head and the concentric shaft are installed and fixed, the movable taper end head can slide along the concentric shaft, and the part, between the limiting taper end head and the movable taper end head, of the concentric shaft is sleeved with a tubular taper expansion core. Multiple kerfs are evenly machined on the two sides of the taper expansion core in the length direction, and the taper expansion core is divided into a first expansion core petal set and a second expansion core petal set through the kerfs. The gasket set comprises a first gasket set and a second gasket set, wherein the first gasket set and the second gasket set are used for being temporarily installed and attached to the positions, corresponding to the first expansion core petal set and the second expansion core petal set, of the inner wall of a workpiece. The expansion core clamp is particularly suitable for high-precision machining of workpieces such as aerial bomb bodies of which the inner walls are provided with grooves, in the expansion core clamping process, damage to the grooves and 'pineapple wedges' on the inner walls of the aerial bomb bodies is low, and the product qualification rate and theproduction efficiency can be better 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 with gaskets and a using 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 beginning to the end with one knife. Therefore, ...

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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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