Precise compression and setting round by mold for large pipes

YIN Jing; ZHAO Jun; SUN Hong-lei; ZHAN Pei-pei

doi:10.3788/OPE.20111909.2072

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Precise compression and setting round by mold for large pipes

Article | 更新时间：2020-08-12

- Precise compression and setting round by mold for large pipes
- Optics and Precision Engineering Vol. 19, Issue 9, Pages: 2072-2078(2011)
- 作者机构：
  
  燕山大学机械工程学院,河北秦皇岛,066004
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20111909.2072
  CLC： TG386.3+1
- Received：13 December 2010，
  
  Revised：26 January 2011，
  
  Published Online：26 September 2011，
  
  Published：26 September 2011
- 稿件说明：
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殷璟, 赵军, 孙红磊, 展培培. 大型管件的模压式精确缩径矫圆[J]. 光学精密工程, 2011,19(9): 2072-2078

YIN Jing, ZHAO Jun, SUN Hong-lei, ZHAN Pei-pei. Precise compression and setting round by mold for large pipes[J]. Editorial Office of Optics and Precision Engineering, 2011,19(9): 2072-2078
殷璟, 赵军, 孙红磊, 展培培. 大型管件的模压式精确缩径矫圆[J]. 光学精密工程, 2011,19(9): 2072-2078 DOI： 10.3788/OPE.20111909.2072.

YIN Jing, ZHAO Jun, SUN Hong-lei, ZHAN Pei-pei. Precise compression and setting round by mold for large pipes[J]. Editorial Office of Optics and Precision Engineering, 2011,19(9): 2072-2078 DOI： 10.3788/OPE.20111909.2072.

摘要

提出以模压式缩径矫圆的方式代替机械扩径以减小管件椭圆度

提高其承压强度。模压式缩径矫圆采用闭合后模腔为一整圆的上、下模具对椭圆管坯进行矫圆

为减小矫圆后管坯的回弹

须使整个管坯内外壁均进入压缩塑性变形

即有足够的压缩率。本文采用小曲率曲梁平面压弯的分析方法对模压式缩径矫圆工艺进行了理论分析

推导出缩径矫圆弹复方程

该方程表示了管坯截面壁厚中心线上任意一点弹复后的曲率半径与管坯初始几何参数、材料性能、缩径率间的关系。工程中管线钢管的椭圆度技术要求一般为0.5%~1%

采用本文方法缩径矫圆后的管坯椭圆度<0.12%

完全满足技术要求。理论分析与实验结果的椭圆度相对偏差<0.09%

几何尺寸相对偏差<0.19%

表明模压式缩径矫圆在工程实际中具有应用价值。

Abstract

A new method called compression and setting round was proposed to replace the mechanical expanding to reduce the ellipticity and increase the compressive strength of large pipes. The compression and setting round by mold was completed by a upper die and a lower die whose cavities could be closed to a whole round. In order to reduce the springback

the within and outside walls of the pipe must be compressed into the plastic deformation

namely

the compression rate must be sufficient. In this paper

the small curvature plane bending theory of curved beam was used to analyze the compression and setting round of the pipe. The springback equation of the compression and setting round was deduced to express the relationship between the curvature radius of any poin on cross-section center line after springback and the initial geometric parameters

material properties and the compression rate of the pipe. After a compression experiment

the ellipticity is less than 0.12%

which fully meets the technical requirements of line pipes for 0.5% to 1% in practice. Furthermore

the relative ellipticity deviation of theoretical analysis and experimental results is less than 0.09% and the relative geometric size deviation is less than 0.19%. Experimental results verify that the springback equation of compression and the setting round method have important application values.

关键词

Keywords

references

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