Internal-pressure automatic forming device and method for large-diameter cylindrical part

Abstract

The invention provides an internal-pressure automatic forming device and method for a large-diameter cylindrical part. The internal-pressure automatic forming device comprises a hydraulic system, a platform, a die and punches, wherein the die is mounted on the platform; the punches are arranged at the two ends of the die; each punch comprises a punch body and a telescopic shaft; each punch body is a multi-layer circular truncated cone structure which comprises a first circular truncated cone and a second circular truncated cone; the end, away from the die, of each punch body is fixedly connected with an axial push rod; each first circular truncated cone is in sealed sliding connection with the inner wall of one end of a pipe blank; each second circular truncated cone is in sealed sliding connection with one end of the die and applies axial side thrust to the cylindrical part; the telescopic shaft is arranged on the end face of the end, close to the pipe blank, of each first circular truncated cone; and the outer diameter of the telescopic shaft is smaller than the inner diameter of the pipe blank. According to the internal-pressure automatic forming device and method, the required hydraulic medium is saved, and the compression volume of the hydraulic medium is further reduced; and the change of the internal pressure of the pipe blank is easier to control, so that the phenomena of buckling, cracking or harmful wrinkling of the pipe blank caused by difficulty in controlling the gradient of the pressure change are prevented.

Description

technical field [0001] The invention specifically relates to a device for automatically forming large-diameter cylindrical parts under internal pressure, and also specifically relates to a method for automatically forming internal pressure for large-diameter cylindrical parts. Background technique [0002] With the enlargement of equipment, the design size of cylindrical parts is also becoming larger and more demanding. Large caliber in the prior art [0003] For the internal pressure forming of a large-diameter cylindrical part, more hydraulic media and higher internal pressure are required due to the larger size of the cylindrical part. However, in the case of high internal pressure, the hydraulic medium itself is compressed, and the volume reduction of the hydraulic medium causes the pressure gradient in the early stage of internal pressure forming to be too slow. When the hydraulic medium is compressed to a certain extent, it is difficult to be further compressed, which...

AI Technical Summary

Problems solved by technology

However, in the case of high internal pressure, the hydraulic medium itself is compressed, and the volume reduction of the hydraulic medium causes the pressure gradient in the early stage of internal pressure forming to be too slow. When the hydraulic medium is compressed to a certain extent, it is difficult to be further compressed, which will lead to this. The pressure gradient is too steep when

This situation makes it difficult to control changes in internal pressure, which can easily lead to buckling, cracking or harmful wrinkling of the tube blank of the cylindrical part

[0004] On the other hand, large-diameter cylindrical parts need to inject more hydraulic media, which causes more pollution and waste of hydraulic media during production, increases production costs, and increases hydraulic media consumption.

[0005] In addition, for the internal pressure forming of large-diameter cylindrical parts, higher requirements are put forward for the sealing ability of the equipment. The common sealing structure in the prior art has been difficult to meet the requirements, and there are insufficient heat resistance, insufficient sealing, and easy aging. , not easy to replace, etc.

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