Perforating and rolling method for producing thin-wall seamless steel pipes and special equipment

A seamless steel pipe, thin-walled technology, applied in metal rolling, metal rolling, metal processing equipment and other directions, can solve the problems of partial wall and iron ears at the tail of the capillary tube, avoid super-extension phenomenon and reduce heating time. , to avoid the effect of the formation of iron ears

Active Publication Date: 2017-09-08
烟台宝钢钢管有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] The present invention mainly solves the problems of partial walls and iron ears at the end of capil

Method used

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  • Perforating and rolling method for producing thin-wall seamless steel pipes and special equipment
  • Perforating and rolling method for producing thin-wall seamless steel pipes and special equipment
  • Perforating and rolling method for producing thin-wall seamless steel pipes and special equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1, see figure 1 , 2 , 3, 4, 5, a pair of actively rotating tapered rolls 2, a plug 3 and a pair of guide plates 5 are installed as deformation tools for a tapered roll piercer using the existing technology, the tapered rolls 2 are arranged up and down, and the guide plates 5 are arranged around; the tapered roller 2 is used as an external deformation tool, and its function is to rely on friction to drag the tube blank 1 into the pass, driving the tube blank 1 to move forward while rotating, and the plug 3 is used as an internal deformation tool to undertake the perforation of the tube blank 1 Rolling on the inner wall of the capillary 4, the role of the guide plate 5 is to limit the lateral deformation of the capillary 4; the tapered roller 2 is divided into four areas, the perforation preparation area L1, the perforation area L2, the expanding rolling area L3 and the capillary gauge circle area L4 ; In the two areas of the perforation area L2 and the expanding...

Embodiment 2

[0037] Embodiment 2, adopt the equipment of embodiment 1, at the rolling angle α=15 of tapered roll 0 , the bite angle of the tapered roll 9 0 ≤β≤12 0 Under the conditions, take the production capillary diameter Dm=524mm, capillary wall thickness Sm=23mm as an example;

[0038] According to the existing technology, the perforation diameter expansion rate δ is taken in the range of 5-30%, and δ=17.5%; in the prior art, the exit cone angle of the tapered roll λ2=3.9°; γ1 is based on the exit cone angle of the tapered roll λ2 Add a space compensation angle, γ1=λ2+0.6 0 =4.4 0 ;γ2=γ1+(0°—2.5°)=4.4 0 ;γ3=γ2=4.4 0 ;

[0039] According to the technology of the present invention, the perforation diameter expansion rate δ takes a value within the range of 30-45%, and δ=37.5%; the exit cone angle of the tapered roll λ2=6°; γ1 is added according to the exit cone angle λ2 of the tapered roll Compensation angle, γ1=λ2+0.5 0 =6.6 0 ;γ2=γ1+(0°—2.5°)=8.8 0 ;γ3=γ1-(2—2.5°)=6.6 0 -(2...

Embodiment 3

[0045] Embodiment 3, adopt the equipment of embodiment 1, at the rolling angle α=15 of tapered roll 0 , the bite angle of the tapered roll 9 0 ≤β≤12 0 Under the conditions, take the production capillary diameter Dm=430mm, capillary wall thickness Sm=23mm as an example;

[0046] According to the prior art, the perforation diameter expansion rate δ takes a value in the range of 5-30%, and δ=13.1%. In the prior art, the tapered roll exit cone angle λ2=3.9°; γ1 is based on the tapered roll exit cone angle λ2 plus a space compensation angle, γ1=λ2+0.6 0 =4.4 0 ;γ2=γ1+(0°—2.5°)=4.4 0 ;γ3=γ2=4.4 0 ;

[0047] According to the technology of the present invention, the perforation diameter expansion rate δ takes a value in the range of 30-45%, and δ=43.3%; the exit cone angle of the tapered roll λ2=6°; γ1 adds a space according to the exit cone angle λ2 of the tapered roll Compensation angle, γ1=λ2+0.5 0 =6.6 0 ;γ2=γ1+(0°—2.5°)=8.8 0 ;γ3=γ1-(2—2.5°)=6.6 0 -(2—2.5°)=4.5 0 ;

...

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PUM

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Abstract

The invention discloses a perforating and rolling method for producing thin-wall seamless steel pipes and special equipment, and belongs to the technical field of steel rolling technologies. The perforating and rolling method is characterized in that the ratio delta of expanding diameter of a perforated hole is larger than 30% and less than or equal to 45% and is designed according to specific technological parameters of perforating deformation, and a conical angle lambda2 of an outlet of each conical roll is equal to 6 degrees; the value of a top conical angle gamma3 within the range of a primary perforating area L21 is small than that of a top conical angle gamma1 within the range of a uniform-wall rolling area L23, and gamma3 is equal to gamma1-(2-2.5 degrees); when the seamless steel pipes with the same specification are produced, the small pipe blank diameter can be selected, the heating time is shortened, and the production efficiency of the seamless steel pipes is improved; and meanwhile, the coefficient of elongation of a perforator can be decreased, and the tail quality of the steel pipes is improved.

Description

Technical field: [0001] The invention relates to the technical field of steel rolling, in particular to a piercing and rolling method and special equipment for producing thin-walled seamless steel pipes, which are mainly used in the manufacture of seamless steel pipes. Background technique: [0002] The production task of seamless steel pipes is to process solid tube blanks into seamless steel pipes with various outer diameters and wall thickness specifications. Taking the continuous rolling steel pipe production method as an example, the hot rolling production process is generally as follows: [0003] Step 1: Heating the solid tube blank to a temperature suitable for deformation; [0004] Step 2: Through the piercing machine, the heated solid tube blank is turned into a hollow capillary tube; [0005] Step 3: Elongate and roll the capillary tube through a continuous tube mill to reduce its wall thickness; [0006] Step 4: Finally, the steel pipe with the required outer d...

Claims

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Application Information

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IPC IPC(8): B21B19/04B21B25/00B21B27/02
CPCB21B19/04B21B25/00B21B27/024B21B2027/022B21B2267/18
Inventor 杨为国夏克东徐福昌刘甲明柏广杰
Owner 烟台宝钢钢管有限责任公司
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