Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for sizing the end of large-diameter seamless steel pipe

A seamless steel pipe and large-diameter technology, which is applied in the field of finishing and sizing devices at the end of large-diameter seamless steel pipes, can solve problems such as low precision of the outer diameter of the end, and achieve the effect of improving ellipse precision

Active Publication Date: 2018-03-13
CHINA NAT HEAVY MACHINERY RES INSTCO
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low precision of the end inner diameter and outer diameter existing in the production and use of large-diameter seamless steel pipes at home and abroad, the purpose of the present invention is to propose a sizing device for the end of large-diameter seamless steel pipes

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for sizing the end of large-diameter seamless steel pipe
  • A method for sizing the end of large-diameter seamless steel pipe
  • A method for sizing the end of large-diameter seamless steel pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In order to solve the problem of low precision of the inner and outer diameters of the ends in the production and use of seamless steel pipes with large diameters (referring to steel pipes with an outer diameter of 508 mm or more) at home and abroad, the purpose of the present invention is to propose such figure 1 The device for sizing the end of a large-diameter seamless steel pipe includes an intermediate box 6 connected to the foundation, and a sliding tie rod 4 is respectively movably pierced around the middle box 6, and the sliding tie rod One end of 4 is fixed on a rear seat 8, and the other end of the sliding rod 4 is fixed on an outer diameter mold box 1; the inside of the outer diameter mold box 1 matches an end outer diameter mold on a radially conical surface 2; said end outer diameter mold 2 is provided with an end inner diameter mold 3; said end inner diameter mold 3 and said end outer diameter mold 2 form a certain diameter cavity 17; said end inner diamete...

Embodiment 2

[0030] On the basis of Example 1, such as figure 1 , 2 , 3, 4, and 5, the outer diameter mold box 1 has a tapered hole 11, the tapered hole 11 has an inner tapered surface 12, and the end outer diameter mold 2 is provided with an outer tapered surface 13 , the outer tapered surface 13 is in contact with the inner tapered surface 12 . The reason why it involves a tapered surface instead of an inclined surface is mainly because the conical surfaces have a large contact area, which is more conducive to the movement of the outer diameter mold box 1 and the end outer diameter mold 2 .

[0031] In the present invention, the outer diameter mold box 1 cooperates with the tapered surface of the end outer diameter mold 2, and the radial dimension change can be realized under the cooperation of the outer diameter driving mechanism 7 and the tapered surface.

Embodiment 3

[0033] On the basis of Example 1, such as figure 1 As shown, the inner diameter driving mechanism 5 and the outer diameter driving mechanism 7 are both hydraulic driving mechanisms. The reason why the hydraulic drive mechanism is selected is that the hydraulic drive structure can control the small displacement during the driving process, which cannot be realized by the motor drive mechanism.

[0034] The hydraulic drive mechanism is a common hydraulic drive mechanism on the market, and will not be described in detail here.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a sizing device for the end of a heavy-caliber seamless steel tube. The sizing device comprises a middle box body connected with a foundation. Sliding pull rods are movably arranged on the periphery of the middle box body in a penetrating manner. One ends of the sliding pull rods are fixed to a rear seat, and the other ends of the sliding pull rods are fixed to an outer diameter mold box body. An end outer diameter mold is arranged in the outer diameter mold box body in the radial direction in a conical face fit manner. An end inner diameter mold is sleeved with the end outer diameter mold. A sizing cavity is formed between the end inner diameter mold and the end outer diameter mold. The interior of the end inner diameter mold is connected with a tapered wedge. The tapered wedge is connected with one end of an inner diameter drive mechanism, and the other end of the inner diameter drive mechanism is fixed to the middle box body. One end of an outer diameter drive mechanism is further fixed to the middle box body, and the rear seat is fixed to the other end of the outer diameter drive mechanism. According to the device, precise sizing of the end of the heavy-caliber seamless steel tube is achieved through the inner diameter mold and the outer diameter mold, and the defect that sizing of the inner diameter and the outer diameter of the end of the tube cannot be achieved at the same time through traditional roll type sizing is overcome.

Description

technical field [0001] The invention belongs to the technical field of seamless steel pipe finishing, in particular to a device and a method for finishing and sizing an end of a large-diameter seamless steel pipe. Background technique [0002] At present, the main production processes of large-diameter seamless steel pipes in my country are hot-rolled large-diameter seamless steel pipes and heat-expanded diameter seamless steel pipes. The maximum size of heat-expanded seamless steel pipes is 325mm-1220mm and the thickest is 200mm. Large-diameter seamless steel pipes are widely used in the transportation of oil, gas, heat, powder, negative pressure air, and drainage media under harsh geological and meteorological conditions. The three-way pipe fittings are also widely used in the nuclear power production industry, which has attracted widespread attention from developed countries. . When laying this type of pipeline, the steel pipe and tee pipe fittings must be butt welded fi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B21D3/14B21D1/00
CPCB21D1/00B21D3/14
Inventor 陈峰汪恩辉常瑜刘杰
Owner CHINA NAT HEAVY MACHINERY RES INSTCO