A punch 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] 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 102764809 A, the utility patent with the authorized announcement number CN 201659188 U, the invention application with the publication number CN101011715 A, etc. The principle and advantages of internal high pressure forming have been fully analyzed. Among these schemes, we have generally seen three schemes for the punch for internal high pressure forming (also commonly called plug for internal high pressure forming in the industry). 1. The invention application with application publication number CN 102764809 A discloses a gasket structure, which relies on the gasket or seal...

AI Technical Summary

Problems solved by technology

[0002] 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 102764809 A, the utility patent with the authorized announcement number CN 201659188 U, the invention application with the publication number CN101011715 A, etc. The principle and advantages of internal high pressure forming have been fully analyzed. Among these schemes, we have generally seen three schemes for the punch for internal high pressure forming (also commonly called plug for internal high pressure forming in the industry). 1. The invention application with application publication number CN 102764809 A discloses a gasket structure, which relies on the gasket or sealing ring to achieve sealing. The gasket is generally thick and requires frequent replacement and maintenance in later use. 2. The utility patent of the authorized notification number CN 201659188 U discloses a structure using a sealing ring arranged at an angle. The material used is the same material as the punch body, and the structure is relatively complicated and difficult to process. 3. Publication number CN 101011715 A The invention application discloses a structure in which the end face of the punch body is provided with an annular groove. 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 relatively Complicated and difficult to process, and the above-mentioned situations have a common feature, that is, the end faces of the sealed ends of the processed pipes are all flat, not inclined

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