Punching head for internal high-pressure forming

Abstract

The invention provides a punching head for internal high-pressure forming with the advantages that the sealing effect is good, the structure is very simple, the stable forming is favorably realized, and the punching head is applicable to a pipe fitting to be processed with the sealed end surface being an inclined surface. The punching head comprises a body (1), wherein one end of the body is divided into a left part and a right part by an annular plane (2), the left part is used for being in clearance fit with a punching head inlet and outlet hole (3) of a mold for internal high-pressure forming, the right part comprises an end surface (4) of one end, the right part is sequentially provided with a guide section, a cylindrical sealing section (6) and a conical sealing section (7) in the axial direction from the right side to the left side, the cylindrical sealing section (6) is used for being in clearance fit with an internal high-pressure formed pipe fitting (12) to be processed, the conical sealing section (7) is used for being extruded and tightly pasted with a sealed end inclined surface (8) of the pipe fitting (12) to be processed, the guide section is sequentially provided with a round corner transition part (5.1) and a conical part (5.2) from the right side to the left side, and the round corner transition part (5.1) is arranged between the end surface (4) and the side surface of the conical part (5.2).

Description

technical field [0001] The invention relates to the technical field of internal high pressure forming devices, in particular to a punch for internal high pressure forming. Background technique [0002] The internal high pressure forming technology has been researched for many years, and there are many plans for patent applications, such as the invention application with the application publication number CN 102764809A, the utility patent with the authorized announcement number CN 201659188U, and the invention application with the publication number CN 101011715A. The principle and advantages of internal high pressure forming have been fully analyzed. Among these schemes, we have roughly seen three schemes for the punch for internal high pressure forming (also commonly referred to as plug for internal high pressure forming in the industry), 1. The invention application of application publication number CN 102764809A discloses a gasket structure, relying on gaskets or sealing ...

AI Technical Summary

Problems solved by technology

[0002] The internal high pressure forming technology has been researched for many years, and there are many plans for patent applications, such as the invention application with the application publication number CN 102764809A, the utility patent with the authorized announcement number CN 201659188U, and the invention application with the publication number CN 101011715A. The principle and advantages of internal high pressure forming have been fully analyzed. Among these schemes, we have roughly seen three schemes for the punch for internal high pressure forming (also commonly referred to as plug for internal high pressure forming in the industry), 1. The invention application of application publication number CN 102764809A discloses a gasket structure, relying on gaskets or sealing rings to achieve sealing. The gaskets are generally thick and require frequent replacement and maintenance in later use. 2. Authorized announcement number What the utility patent of CN 201659188U discloses is a kind of structure that adopts the sealing ring of inclined arrangement, and the material adopted is the same material as punch body, and structure is comparatively complicated, is difficult for processing, and 3, the invention application of publication number CN 101011715A discloses is A structure with an annular groove on the end face of the punch body. There is a large gap between the side wall of the pipe to be processed and the mold. There is no support, and there are situations such as instability and wrinkling during forming compensation. In addition, the structure is more complicated and difficult to process. Moreover, the above-mentioned situations have a common feature, that is, the end faces of the sealed ends of the processed pipe fittings are all flat, not inclined.

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