厚向强度分布对特厚板三辊预弯成形的影响

doi:10.13229/j.cnki.jdxbgxb201503028

吉林大学学报(工学版) ›› 2015, Vol. 45 ›› Issue (3): 878-883.doi: 10.13229/j.cnki.jdxbgxb201503028

厚向强度分布对特厚板三辊预弯成形的影响

仉志强, 付建华, 宋建丽, 金坤善, 李永堂

太原科技大学材料科学与工程学院,太原 030024

收稿日期:2013-09-02 出版日期:2015-05-01 发布日期:2015-05-01
作者简介:仉志强(1982-),男,博士研究生.研究方向:塑性成形工艺与装备.
基金资助:
山西省重大科技专项项目(20111101032); 山西省高等学校科技创新项目(2015171); 太原科技大学博士启动基金项目(20142040); 太原科技大学青年基金项目(20143010)

Influence of material strength distribution along thickness on three-roller edge pre-bending of thick plate

ZHANG Zhi-qiang, FU Jian-hua, SONG Jian-li, JIN Kun-shan, LI Yong-tang

School of Material Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China

Received:2013-09-02 Online:2015-05-01 Published:2015-05-01

摘要/Abstract

摘要： 选取100、220 mm两种厚度Q235热轧板,在厚向多个等间距分布位置切取圆棒试样,采用WAW-E100试验机获得各试样在3.0×10^-5 s^-1应变速率时的拉伸应力应变曲线。根据拉伸试验数据建立考虑厚向强度分布的材料应力-应变函数。分析特厚板在CDW11XNC-300\420 mm×2500 mm重型三辊卷板机上的预弯成形过程并建立预弯工艺模型。预弯模型计算结果表明,特厚板厚向强度变幅为0~20%时,上辊垂直力增幅约为0~13%,回弹比略有增加,卸载前预弯角无明显变化。

关键词: 材料合成与加工工艺, 三辊预弯, 厚向材料强度, 拉伸试验, 特厚板

Abstract: Three-roller edge pre-bending of thick plate is affected by non-uniform material strength distribution along the thickness introduced by multi-pass roll forming and heat treatment. Hot-rolled Q235 plates with thickness of 100 mm and 200 mm were investigated by tensile testing of round bars from equal spaced multi-positions along the thickness. The material stress-strain curves of tensile bars were achieved by tensile testing on WAW-E100 machine at a strain rate of 3.0 × 10^-5 s^-1. The stress-strain relationship of the material considering the non-uniform distribution was obtained. Three-roller edge pre-bending process of thick plate on CCDW11XNC-300\420×2500 mm heavy machine with bottom rollers horizontally adjustable was analyzed and an edge pre-bending model was developed. Numerical results by this model show that a strength variation of 0~20% along thickness could result in top-roller force variation of 0~13%, little increase in springback ratio, and no effect on pre-bending angle before unloading.

Key words: materials synthesis and processing technology, three-roller edge pre-bending, material strength over thickness, tensile test, thick plate

中图分类号:

TG315.7

仉志强, 付建华, 宋建丽, 金坤善, 李永堂. 厚向强度分布对特厚板三辊预弯成形的影响[J]. 吉林大学学报(工学版), 2015, 45(3): 878-883.

ZHANG Zhi-qiang, FU Jian-hua, SONG Jian-li, JIN Kun-shan, LI Yong-tang. Influence of material strength distribution along thickness on three-roller edge pre-bending of thick plate[J]. 吉林大学学报(工学版), 2015, 45(3): 878-883.

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厚向强度分布对特厚板三辊预弯成形的影响

Influence of material strength distribution along thickness on three-roller edge pre-bending of thick plate

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