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Forging mandrel for hot-forging tubular workpieces of metal

A technology for metal workpieces and cores, applied in metal processing equipment, applications, household appliances, etc., can solve the problems of complex and expensive manufacturing of forging cores, and reduce the shape stability of forging cores, so as to reduce wear and improve shape stability. sexual effect

Inactive Publication Date: 2011-07-13
V&M DEUT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the production of the forging core is very complex and expensive; on the other hand, the heat input into the core material is not reduced, which reduces the shape stability of the forging core at high temperature stresses and thus leads to premature failure

Method used

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  • Forging mandrel for hot-forging tubular workpieces of metal
  • Forging mandrel for hot-forging tubular workpieces of metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] The forging core shown in the single figure has a core body 1 provided with chamfers 3 , 4 which is fastened to a holding rod 2 . This retaining rod 2 is required to enable the axial and rotational movement of the forging core in the tubular workpiece, not shown here.

[0032] The core body 1 is made of heat-resistant steel, which according to the invention is provided with a layer 5 which reduces the heat conduction into the core body 1 in the working region.

[0033] In this case, the heat conductivity of the layer 5 is significantly lower than the material of the core body 1 in order to reduce the heat input and thus ensure the shape stability of the core body 1 even at high forging temperatures.

[0034] The core body 1 is designed as a solid body in this case, but it is also possible to provide an internal cooling device for this core body in order to dissipate the unavoidable heat input into the core body 1 as rapidly as possible during forging.

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Abstract

The invention relates to a forging mandrel for hot-forging tubular workpieces of metal, said mandrel comprising a mandrel body and a mandrel bar, in which forging mandrel the mandrel body is composed of a heat-resistant material. The forging mandrel according to the invention is embodied here in such a way that the mandrel body is provided, at least in the operating region, with a layer which reduces the dissipation of heat into the mandrel body during the forging process and adheres firmly to the mandrel body, wherein the layer has a lower thermal conductivity than the material of the mandrel body and has a thickness of at least 50 [mu]m.

Description

technical field [0001] The invention relates to a forging die core for hot forging tubular metal workpieces. Background technique [0002] A hot-forged tubular workpiece, for example a seamless steel tube, is known from DE 10 2005 052 178 A1. [0003] In this method, starting from a block heated to the deformation temperature, a thick-walled hollow block is formed in a first deformation step by perforation, which is then applied to the outer surface of the hollow block using at least two forging machines. Forging jaws (Schmiedebacken) on the upper part and a forging core inserted into the hollow block as an inner die are forged into seamless tubes by means of a radial forging process. In this case, the hollow mass is rotated and moved axially in a clocked manner during the idle travel phase of the forging jaws. [0004] Forging cores are exposed to significant thermal and mechanical stress during the forging process, which leads to wear phenomena on the die surfaces and sh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J13/00
CPCB21J13/00B21D9/00B21J13/08B21K21/00
Inventor S·维登迈尔R·屈默尔灵G·霍姆伯格P·莱费布弗莱
Owner V&M DEUT GMBH