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Facility for producing piercing plug

一种制造设备、轧制机的技术，应用在穿孔轧制用顶头的制造设备领域，能够解决覆膜剥离等问题，达到提高顶头寿命的效果

Active Publication Date: 2014-12-24
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, even for plugs with arc sprayed coatings manufactured by the existing manufacturing equipment disclosed in the same document, when the piercing length of the billet is long or the high temperature strength of the billet is high, sometimes Film stripping
Therefore, there is room for improvement in terms of stably increasing the life of the plug, and it is strongly desired to manufacture a plug for piercing and rolling that can improve this point.

Method used

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  • Facility for producing piercing plug
  • Facility for producing piercing plug
  • Facility for producing piercing plug

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach ＞

[0069] Figure 7It is a schematic diagram showing the manufacturing equipment of the plug with an arc sprayed coating as the first embodiment of the present invention. The manufacturing facility of the first embodiment shown in the same figure uses the figure 1 , figure 2 The configurations of the manufacturing facilities of Conventional Examples 1 and 2 shown are based on it, and redundant descriptions are appropriately omitted.

[0070] Such as Figure 7 As shown, the manufacturing facility of this embodiment includes an arc spraying device 10 and a shot blasting device (not shown) arranged in the preceding stage of the arc spraying device 10 . The shot blasting device is the same as that of the manufacturing facilities of the above-mentioned conventional example 1 and example 2.

[0071] In this embodiment, the outer surface of the base material of the plug 1 is divided into two regions along the axial direction of the plug 1 . Figure 7 An example of being divided i...

no. 2 Embodiment approach ＞

[0085] Figure 8 It is a schematic diagram showing the manufacturing equipment of the plug with an arc sprayed coating as the second embodiment of the present invention. The manufacturing equipment of the second embodiment shown in the same figure and the Figure 7 Compared with the manufacturing facility of the first embodiment shown, the configuration differs in the following points.

[0086] The manufacturing facility of this embodiment increases the number of regions obtained by dividing the outer surface of the base material of the plug 1 . That is, in this embodiment, the base material outer surface of the plug 1 is divided into three regions along the axial direction of the plug 1 . Figure 8 An example of being divided into a tip end portion 1a, a main body front half 1ba, and a main body rear half 1bb is shown in .

[0087] The arc spraying apparatus 10 in this embodiment has three spraying chambers 11A, 11B, and 11C for forming the coating 3 , the number of which ...

Embodiment

[0100] In order to confirm the effect of the present invention, a test was performed in which a plug for piercing and rolling was manufactured, and the manufactured plug was mounted on a piercer to perform piercing and rolling. The test conditions are as follows.

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Abstract

This facility for producing a plug used in a piercing mill used in the production of a seamless steel pipe is provided with: a shot blasting device that shot blasts the surface of a plug; and an arc spraying device that arc sprays an iron wire to the base material surface of the plug that has been subjected to shot blasting, forming a coating film configured from an oxide and Fe. The arc spraying device has a plurality of spraying booths that individually form a coating film for each of a plurality of regions resulting from demarcating the base material surface of the plug along the axial direction of the plug. As a result, it is possible to produce a plug that can maintain plug production efficiency at a high level, is stable during piercing, and can have increased plug life.

Description

technical field [0001] The present invention relates to a piercing-rolling plug (hereinafter also simply referred to as "plug") used in a piercing-rolling machine (hereinafter also simply referred to as "piercing machine (piercing-rolling machine)") for manufacturing seamless steel pipes Manufacturing equipment for piercing and rolling plugs, in particular, a coating is formed by arc spraying an iron wire rod on the outer surface of the base material of the plug. Background technique [0002] Seamless steel pipes can be manufactured by the Mannesmann pipe method. The control method consists of the following steps: [0003] (1) The raw material (round steel billet) heated to a predetermined temperature is pierced and rolled by a piercer to form a hollow tube blank (hollow blank tube); [0004] (2) Extending and rolling the hollow tube billet by using an extension rolling machine (for example: a mandrel type seamless tube mill); [0005] (3) Using a sizing rolling machine (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B25/00B21B19/04C23C4/08C23C4/10C23C4/12
CPCB21B19/04B21B25/00B24C3/32C23C4/02C23C4/06C23C4/131C23C4/08
Inventor 山本知央日高康善东田泰斗
Owner NIPPON STEEL CORP
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