Precise compression and setting round by mold for large pipes

Jing, 殷璟 Yin; Jun, 赵军 Zhao; Hong-lei, 孙红磊 Sun; Pei-pei, 展培培 Zhan

doi:10.3788/ope.20111909.2072

Cited by 13 publications

(3 citation statements)

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“…Pan et al [16] proposed a rounding and sizing process, which produced a permanent deformation of about 0.5% of the circumference by the two-half mold to achieve rounding and sizing. Yin et al [17] proposed a compression and setting round process by using upper and lower dies with the closed cavity as a full circle, and then completed a springback analysis. Zhao et al [18] combined JCO forming with a calibration process by compression and verified that this calibration process had the same sizing effect as an expansion process.…”

Section: Introductionmentioning

confidence: 99%

Two-Roller Continuous Calibration Process by Compression for Submarine Pipelines

et al. 2021

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Submarine pipeline is a key part in the development of deep sea and ultra-deep sea oil and gas. In order to reduce the ovality of pipes and improve their compressive strength, a two-roller continuous calibration (TRCC) process by compression is proposed. A springback analysis of compress bending is carried out, and an analytical model is established, which predicts ovality after calibration and provides a theoretical basis for roller shape design and process parameter formulation. Numerical simulation and physical experiments are carried out. The distribution of stress and strain is analyzed. The effects of initial ovality, reduction ratio and initial placement angle on the ovality after calibration are studied. When the reduction ratio is about 1%, the ovality is optimal. The theoretical analysis shows that the ovality after calibration is about 0.03%, and the ovality after calibration by numerical simulation and experiment is less than 0.45%, proving the feasibility of the process.

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Section: Introductionmentioning

confidence: 99%

Two-Roller Continuous Calibration Process by Compression for Submarine Pipelines

et al. 2021

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“…Herynk et al [5] studied the UOE and UOC processes through numerical simulations, and presented that compression, instead of expansion, can significantly improve the collapse performance. Yin et al [6] analyzed the compression process and Yu et al [7] adjusted the roundness of the elbow with the compression mode in a cold stamping process for forming single-welded elbows. They proved that the roundness of the pipe can be improved by compression.…”

Section: Introductionmentioning

confidence: 99%

Intelligent Control System of Internal Expansion over Bending and Calibration (IEOBC) Process for Large Pipe Ends

et al. 2021

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The flattening and asymmetry of a pipe end section seriously affects the welding quality between pipes, therefore the calibration process for pipe end to improve roundness is essential. Because the calibration for a pipe end involves local elastic-plastic deformation for the end effect, it is still difficult to establish an accurate theoretical model. The reasonable and intelligent control method is nevertheless an effective means to improve the production efficiency. In this paper, an internal expansion over bending and calibration (IEOBC) process is introduced. According to the characteristics of the process, the structure of the mobile intelligent calibration machine for large pipe ends is designed, and the intelligent control hardware system of the machine is built. Based on the LabVIEW software platform, an intelligent control software system for the IEOBC process is developed. A three-step control strategy is combined with pipe size detection and ovality recognition. The intelligent prediction and execution of the calibration process parameters are realized. The experimental results show that the intelligent control system has good stability and accuracy, and the ovality can be controlled within 0.5%.

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“…At present, the roundness calibration process mainly includes the whole-diameter roundness calibration process [5,6], the over-bending roundness calibration process [7][8][9], and the roll-type roundness calibration process [10][11][12]. Common straightness calibration techniques include the pressure straightening [13][14][15] and the cross roll straightening [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Deformation Mechanism Analysis of Three-Roller Continuous and Synchronous Calibration Process of Straightness and Roundness For LSAW Pipes

Huang

Wang³

et al. 2021

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Continuous and synchronous calibration process of straightness and roundness for LSAW (Longitudinally Submerged Arc Welding, LSAW) pipes with three rollers is a bidirectional reciprocating bending process that includes axial and circumferential directions. It is particularly important to reveal the deformation mechanism, which provides theoretical support for the calibration process to be applied to actual production. Based on this, through the combination of references, theoretical analysis and numerical simulation, the deformation mechanism is analyzed in this paper. The whole deformation process of pipe is modeled and then numerically simulated with FEM software of ABAQUS. The results show that reciprocating bending can eliminate the difference of initial curvature, so that the axial curvature and circumferential curvature are unified to the same direction and value respectively. The synergy between the axial reciprocating bending straightening process and the circumferential reciprocating bending rounding process realizes the calibration process of LSAW pipes. The simulation results support the theoretical results, and the deformation is mainly caused by axial stress and circumferential stress.

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Precise compression and setting round by mold for large pipes

Cited by 13 publications

References 0 publications

Two-Roller Continuous Calibration Process by Compression for Submarine Pipelines

Two-Roller Continuous Calibration Process by Compression for Submarine Pipelines

Intelligent Control System of Internal Expansion over Bending and Calibration (IEOBC) Process for Large Pipe Ends

Deformation Mechanism Analysis of Three-Roller Continuous and Synchronous Calibration Process of Straightness and Roundness For LSAW Pipes

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