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JCO steel pipe forming shape-adjusting process

A steel pipe and shape adjustment technology, which is applied in the field of steel pipe manufacturing, can solve problems such as poor pipe shape, low precision, and inability to adjust, and achieve high geometric dimension accuracy, improve forming efficiency, and improve shape adjustment efficiency.

Active Publication Date: 2019-08-09
BC P INC CHINA NAT PETROLEUM CORP +2
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Problems solved by technology

The accuracy of this method is not high; and the first two passes cannot be measured by profiling, often the deviation of the reduction in the first two passes is large, and it cannot be adjusted after the subsequent measurement is found, resulting in poor pipe shape or direct scrapping

Method used

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  • JCO steel pipe forming shape-adjusting process
  • JCO steel pipe forming shape-adjusting process
  • JCO steel pipe forming shape-adjusting process

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Embodiment Construction

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0033] Please also refer to Figure 1 to Figure 4 , the JCO steel pipe forming adjustment process provided by the present invention will now be described. The JCO steel pipe forming adjustment process includes forming process design: that is, determining the number of pressing passes, calculating the theoretical reduction and theoretical chord height of each pass, such as figure 1 As shown, the theoretical chord height is the chord height H corresponding to the measurement string 3, and the measurement chord is the chord corresponding to the inner arc formed by pr...

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Abstract

The invention provides a JCO steel pipe forming shape-adjusting process, and belongs to the technical field of steel pipe manufacturing. The process comprises the steps of determining pressing pass numbers; calculating the theoretical reduction amount and the theoretical chord height of each pass, wherein the theoretical chord height is the chord height corresponding to the measuring chord, and the measuring chord is the chord corresponding to the inner arc molded through pressing; and pressing a steel plate, after each-pass pressing, measuring the actual chord height corresponding to the theoretical chord height, and according to the difference value between the actual chord height and the theoretical chord height, adjusting the theoretical reduction amount until pressing of all passes can be finished. According to the JCO steel pipe forming shape-adjusting process, the geometric dimensioning precision of a pipe formed through the JCO process is improved, and the shape-adjusting efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of steel pipe manufacturing, and more specifically relates to a JCO steel pipe forming and adjustment process. Background technique [0002] The JCO forming process is a progressive bending forming method for the production and manufacture of large-diameter straight welded seam steel pipes. It is a widely used steel pipe forming process. With the increase of national oil and gas pipeline construction, the grade of steel pipes is getting higher and higher, and the diameter and wall thickness of steel pipes are also getting bigger and bigger. The increase in the grade of the steel pipe leads to an increase in the strength of the raw steel plate, and an increase in the amount of springback after pressing during the forming process; the increase in the caliber leads to an increase in the number of pressing passes; the above situation makes it difficult to control the forming accuracy of the steel pipe through th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D5/01B21C51/00
CPCB21D5/006B21D5/01
Inventor 陈小伟白学伟韩铁利郭振其
Owner BC P INC CHINA NAT PETROLEUM CORP
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