Plug for large-hole series medium- and thick-wall capillaries

A series of capillary technology, applied in the field of plugs, can solve the problems of excessive wall thickness at the end of the steel pipe, unfavorable rod insertion, and high recutting rate, so as to improve the wall thickness accuracy, ensure the quality of the inner surface, and reduce metal consumption.

CN101947551AInactive Publication Date: 2011-01-19HENGYANG VALIN STEEL TUBE
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-01-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the field of steel pipe production, in particular to a plug for punching of large-hole series medium- and thick-wall capillaries. The outline of the plug consists of a punching section, an expanding section, a rolling section, a circling section and a reverse cone section. The front end surface of the plug adopts a flat head design, and a bar inserting hole is formed on the tail end of the plug; connection between the front end surface of the plug and the punching section is realized through arc transition, wherein the arc radius is R2, and the arc radius of the outline of the punching section is R3; the expanding section and the rolling section are cones, wherein the taper of the expanding section is a2, and the taper of the rolling section is a1; the outline of the reverse cone section is an arc of which the arc radius is R1; and the circling section is a cylinder.
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Description

technical field

[0001] The invention relates to the field of steel pipe production, in particular to a plug used for piercing thick-walled capillaries in a series of large holes. Background technique

[0002] At present, the 340 unit hot rolling production line that produces hot-rolled seamless steel pipes adopts the production process of conical roll perforation + 5 racks continuous rolling tube + 3 racks for tube removal + 12 racks for sizing, and the tube billet is perforated by tapered rolls machine, which can be used to thread capillary tubes made of high alloy steel and thinner tube walls.

[0003] The plug is an important internal deformation tool in the piercing process, which plays an important role in the quality and wall thickness of the capillary inner surface. The plug used for piercing on the cone roll piercing machine is attached figure 1 As shown, the outer profile of the plug is composed of a perforation section 1, a diameter-expanding section 2, a diamete...

Examples

Embodiment 1

[0025] Embodiment 1: A type 303 large-hole medium-thick-wall capillary plug. The outer profile of the plug is composed of a perforated section 10 , a diameter-expanding section 11 , a rolling section 12 , a rounding section 13 and a reverse cone section 14 . The front end surface 9 of the plug adopts a flat head design, and the tail end of the plug is provided with a rod hole 15; the connection between the front end face 9 of the plug and the perforated section 10 adopts a circular arc transition, and the radius of the arc is R2, and the arc radius of the outer profile of the perforated section 10 is R3; diameter expanding section 11 and rolling section 12 are cones, the taper of expanding diameter section 11 is a2, and the taper of rolling section 12 is a1; is R1; the return-to-circle segment 13 is a cylinder. Its specific dimensions are as follows:

[0026] The total length L=685mm of the plug; the length L1=227mm of the perforated section 10, the diameter D3=53.11mm of the...

Embodiment 2

[0027] Embodiment 2: A type 309 large-hole type medium-thick-walled capillary plug. The outer profile of the plug is composed of a perforated section 10, a diameter-expanding section 11, a rolling section 12, a rounding section 13 and a reverse cone section 14. The front end surface 9 of the plug adopts a flat head design, and the tail end of the plug is provided with a rod hole 15; the connection between the front end face 9 of the plug and the perforated section 10 adopts a circular arc transition, and the radius of the arc is R2, and the arc radius of the outer profile of the perforated section 10 is R3; diameter expanding section 11 and rolling section 12 are cones, the taper of expanding diameter section 11 is a2, and the taper of rolling section 12 is a1; is R1; the return-to-circle segment 13 is a cylinder. Its specific dimensions are as follows:

[0028] The total length L=685mm of the plug; the length L1=238mm of the perforated section 10, the diameter D3=56.36mm of ...

Embodiment 3

[0029] Embodiment 3: A type 323 large-hole type medium-thick-walled capillary plug. The outer profile of the plug is composed of a perforated section 10, a diameter-expanding section 11, a rolling section 12, a rounding section 13 and a reverse cone section 14. The front end surface 9 of the plug adopts a flat head design, and the tail end of the plug is provided with a rod hole 15; the connection between the front end face 9 of the plug and the perforated section 10 adopts a circular arc transition, and the radius of the arc is R2, and the arc radius of the outer profile of the perforated section 10 is R3; diameter expanding section 11 and rolling section 12 are cones, the taper of expanding diameter section 11 is a2, and the taper of rolling section 12 is a1; is R1; the return-to-circle segment 13 is a cylinder. Its specific dimensions are as follows:

[0030] The total length L=685mm of the plug; the length L1=280.04mm of the perforated section 10, the diameter D3=61.14mm ...