Necking mold for thin-wall cylindrical parts

Abstract

The invention discloses a necking mold for thin-wall cylindrical parts. An upper die is provided with a mandrel and a female die; a lower die is provided with a positioning ring and a sectioned male die; the thin-wall cylindrical parts are installed in a gap between the sectioned male die and the positioning ring and a gap between the sectioned male die and the female die; the sectioned male die is divided into a plurality of sectioned dies; when the thin-wall cylindrical parts are in a necking process, the upper die is gradually combined with the lower die; the mandrel gradually extends intothe sectioned female die; the mandrel is used for pushing the sectioned male die to radially expand so as to apply pressure stress to the non-necked cylindrical wall of the part and eliminate drum-like formation of the cylindrical wall; after being expanded, the sectioned male die seamlessly clings to the part in the circumferential direction, the roundness of the part can be corrected, no waved edges are generated at the cylindrical wall, the surface quality of the part is obviously improved; and the necking mold is simple in structure, convenient to use, easy to operate and high in machiningefficiency.

Description

【Technical field】 [0001] The invention belongs to the field of stamping processing and manufacturing of thin-walled cylindrical parts of aero-engines, and relates to a necking die, in particular to an inner support of the necking die. 【Background technique】 [0002] The upper part of the thin-walled cylindrical part has a gradually shrinking neck, and the lower part is a cylindrical shape with the same diameter, such as figure 1 As shown; at this stage, the molds used in the processing of thin-walled cylindrical parts only have some rigid internal supports for the straight section of the blank, or there is no internal support, and there is no internal support for the shrinkage deformation part. During the necking process, because there is no rigid internal support, the straightness of the unshrunk cylinder wall of the part is poor, and a "drum" shape deformation will occur. The necking part is prone to obvious wrinkles, which is difficult to eliminate in subsequent processin...

AI Technical Summary

Problems solved by technology

[0002] The upper part of the thin-walled cylindrical part has a gradually shrinking neck, and the lower part is a cylindrical shape with the same diameter, such as figure 1 As shown; at this stage, the molds used in the processing of thin-walled cylindrical parts only have some rigid internal supports in the straight section of the blank, or there is no internal support, and the necking deformation part does not have any internal support

During the necking process, because there is no rigid internal support, the straightness of the unshrunk cylinder wall of the part is poor, and a "drum" deformation will occur. The necking part is prone to obvious wrinkles, which is difficult to eliminate in subsequent processing, which seriously affects the quality of product delivery.

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