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Piercing mandrel having an improved service life for producing seamless tubes

A technology of seamless pipes and punches, applied in metal processing equipment, metal rolling, manufacturing tools, etc., can solve the problems of increasing service life, unable to cool the top of punches, complex production process, etc.

Active Publication Date: 2016-03-02
VALLOUREC DEUT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of this construction include that there is still insufficient cooling of the punch tip itself, and that the oblique position of these coolant outlets on the one hand complicates the production process and on the other hand no longer reliably prevents passage during the punching process. Vent closure due to contact of punch tip with pellet material
Another disadvantage is that the one-piece design of the punch makes it necessary to replace the entire punch if it becomes worn
The disadvantage of this solution is that it does not cool the punch tip and still does not significantly increase the service life in the case of difficult-to-machine materials
[0011] All of the measures already mentioned in this article are not suitable for effectively reducing the thermo-mechanical loads on the punch during cross-rolling, so that, from an economical and qualitative point of view, when they are used for difficult-to-machine materials, Inability to achieve a sufficiently long service life

Method used

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  • Piercing mandrel having an improved service life for producing seamless tubes
  • Piercing mandrel having an improved service life for producing seamless tubes
  • Piercing mandrel having an improved service life for producing seamless tubes

Examples

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Embodiment Construction

[0032] figure 1 A conical piercing mill is shown. This conical piercing mill utilizes the punch of the present invention to form a solid block of steel into a hollow block tube. The conical piercing mill 1 comprises two work rolls 2, 2'. These two work rolls form the solid block 3 into a hollow block tube 6 with internal tooling. The internal tools include the punch 4 and mandrel 5 of the present invention. In the opposite direction to the direction of rotation of the work rolls 2, 2', the solid block 3 or hollow block tube 6 is moved in a helical fashion by axially fixed internal tools.

[0033] According to the invention, the punch 4 comprises a punch body 4.1 to which a punch nose 4.2 is connected. The diameter of the punch body 4.1 increases continuously from the nose side to a maximum value which determines the inner diameter of the hollow block tube 6 . According to the invention, the punch nose 4.2 has a diameter that decreases conically towards the punch body 4.1....

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PUM

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Abstract

The invention relates to a piercing mandrel(4)for piercing heated round blooms(3)made of metal,in order to produce seamless tubes (6),the piercing mandrel comprising a piercing mandrel nose(4.2)and a piercing mandrel main body(4.1)that can be connected to a mandrel bar(5).According to the invention, the external diameter of the piercing mandrel nose(4.2)is conically tapered in the longitudinal direction towards the piercing mandrel main body (4.1),in order to increase the service life of the piercing mandrel when cross-roll piercing round blooms made of metal,in particular made of more highly alloyed steel materials that are difficult to form,while taking into consideration a qualitative improvement of the inner surface of the pierced round blooms,and while reducing the cost of tools.

Description

technical field [0001] The invention relates to a punch for producing seamless pipes by punching hot circular metal blocks. The punch includes a punch nose and a punch body attachable to a punch mandrel. Background technique [0002] As is known, seamless pipes are produced as follows: Using axially fixed internal tools, the raw material, the so-called round block, formed in the original cylindrical shape and heated in an annular furnace is processed in a piercing mill to produce a tubular hollow block . Wherein, the internal tool includes a punch and a punch mandrel. [0003] To make seamless hollow block tubes, after gripping the tubular hollow block through the piercing mill, the tubular hollow block is conveyed through the piercing mill in a helical form, whereby the tubular hollow block passes through an axially fixed internal tool and is The tubular hollow block is wall-ironed in a subsequent step of the method to produce a seamless tube. The round block is pushed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B25/00
CPCB21B25/00
Inventor 温弗里德·布劳恩克里斯蒂安·科勒姆佩尔勒内·巴德约尔罗尔夫·屈梅尔林
Owner VALLOUREC DEUT
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