Assel机组轧制薄壁管壁厚螺旋性不均研究
发布时间：2019-05-17 19:10
【摘要】：目前在热轧无缝钢管生产中,Assel三辊斜轧延伸工艺是高精度无缝钢管的重要生产方式之一。尽管Assel轧管机组提高了轧机的金属利用率,扩大了产品的规格范围,但在实际生产薄壁管时会出现轧后荒管壁厚螺旋性不均、内螺纹深度严重等问题。随着开钻的油井越来越深,复杂地质环境的油气井对套管抗挤毁性能以及抗腐蚀性能提出了更高的要求。由于薄壁管螺旋性壁厚不均及内螺纹深度严重,内螺纹在承受高负荷(内部压力)易使套管发生螺旋状裂纹,致使油井报废造成巨大的经济损失,因此控制内螺纹的产生或减轻内螺纹深度研究无疑对提高石油套管的抗挤毁性能具有重要理论和现实意义。本文基于江苏常宝钢管股份有限公司Φ140mm Assel三辊轧管机组装备及工艺条件,借助于三维实体建模软件UG及商用有限元软件Simufact,对5Cr钢典型规格Φ160×6.5mm荒管Assel斜轧过程进行了数值模拟仿真。系统研究了不同芯棒运行方式、送进角以及辗轧带线型对轧后荒管内螺纹深度的大小、纵向壁厚分布形态、横向壁厚不均及单位螺距的影响。研究主要结论如下:(1)轧件的单位螺距随轧件在变形区中轴向速度的增大而增大,变阻力为拉力芯棒以及增大送进角的方法都能提高单位螺距,且芯棒的运动方式对轧件的单位螺距的影响较为明显;(2)在三辊斜轧过程中,钢管的横截面变形是由圆形→三角形状的“桃尖”→圆形的过程;(3)全浮动芯棒轧后荒管内螺纹最浅,固定芯棒次之,拉力芯棒最深;随着送进角的增大,轧后荒管的内螺纹逐渐加深;双曲线型辗轧带相比较直线型辗轧带轧后荒管的内螺纹深度要浅;(4)当芯棒的运动方式由固定芯棒变成拉力芯棒,轧后荒管壁厚不均的平均相对值逐渐增大,从2.756%增大到3.385%;当送进角从5°增大到7°时,荒管壁厚不均的平均相对值从3.796%增加到了4.196%。
[Abstract]:At present, Assel three-roll cross rolling extension process is one of the important production methods of high precision seamless steel pipe in the production of hot rolled seamless steel pipe. Although Assel pipe mill improves the metal utilization ratio of rolling mill and expands the specification range of the product, there will be some problems such as uneven wall thickness helix and serious internal thread depth in the actual production of thin-wall pipe. As the drilling wells become deeper and deeper, the casing collapse resistance and corrosion resistance of oil and gas wells in complex geological environment are put forward higher requirements. Because the spiral wall thickness of thin-wall pipe is uneven and the depth of internal thread is serious, the internal thread is easy to cause spiral crack of casing under high load (internal pressure), resulting in huge economic loss caused by the scrapping of oil well. Therefore, it is of great theoretical and practical significance to control the generation of internal thread or reduce the depth of internal thread in order to improve the anti-extrusion damage performance of oil casing. Based on the equipment and process conditions of 桅 140mm Assel three-roll pipe mill in Jiangsu Changbao Steel Pipe Co., Ltd., with the help of three-dimensional solid modeling software UG and commercial finite element software Simufact,. The Assel cross rolling process of 桅 160 脳 6.5mm waste pipe of 5Cr steel was simulated by numerical simulation. The effects of different mandrel operation modes, feed angle and rolling strip line on the depth of internal thread, the distribution of longitudinal wall thickness, the uneven transverse wall thickness and the unit pitch of waste pipe after rolling were studied systematically. The main conclusions are as follows: (1) the unit pitch of the rolled piece increases with the increase of the axial velocity in the deformation zone, and the unit pitch can be increased by changing the resistance into a tension mandrel and increasing the feed angle. And the movement mode of the mandrel has obvious influence on the unit pitch of the rolled piece. (2) in the process of three-roll cross rolling, the cross section deformation of steel pipe is made of "peach tip" in the shape of circular triangle, (3) after full floating mandrel rolling, the internal thread of waste pipe is the shallower, the fixed mandrel is the second, and the tension mandrel is the deepest. With the increase of feed angle, the internal thread of waste pipe after rolling is deepened gradually, and the depth of internal thread of waste pipe after straight line rolling is lighter than that of linear rolling strip. (4) when the movement mode of mandrel changes from fixed mandrel to tension mandrel, the average relative value of uneven wall thickness of waste pipe increases gradually, from 2.756% to 3.385%; When the feed angle increases from 5 掳to 7 掳, the average relative value of uneven wall thickness of waste pipe increases from 3.796% to 4.196%.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE931.2;TG335.7
[Abstract]:At present, Assel three-roll cross rolling extension process is one of the important production methods of high precision seamless steel pipe in the production of hot rolled seamless steel pipe. Although Assel pipe mill improves the metal utilization ratio of rolling mill and expands the specification range of the product, there will be some problems such as uneven wall thickness helix and serious internal thread depth in the actual production of thin-wall pipe. As the drilling wells become deeper and deeper, the casing collapse resistance and corrosion resistance of oil and gas wells in complex geological environment are put forward higher requirements. Because the spiral wall thickness of thin-wall pipe is uneven and the depth of internal thread is serious, the internal thread is easy to cause spiral crack of casing under high load (internal pressure), resulting in huge economic loss caused by the scrapping of oil well. Therefore, it is of great theoretical and practical significance to control the generation of internal thread or reduce the depth of internal thread in order to improve the anti-extrusion damage performance of oil casing. Based on the equipment and process conditions of 桅 140mm Assel three-roll pipe mill in Jiangsu Changbao Steel Pipe Co., Ltd., with the help of three-dimensional solid modeling software UG and commercial finite element software Simufact,. The Assel cross rolling process of 桅 160 脳 6.5mm waste pipe of 5Cr steel was simulated by numerical simulation. The effects of different mandrel operation modes, feed angle and rolling strip line on the depth of internal thread, the distribution of longitudinal wall thickness, the uneven transverse wall thickness and the unit pitch of waste pipe after rolling were studied systematically. The main conclusions are as follows: (1) the unit pitch of the rolled piece increases with the increase of the axial velocity in the deformation zone, and the unit pitch can be increased by changing the resistance into a tension mandrel and increasing the feed angle. And the movement mode of the mandrel has obvious influence on the unit pitch of the rolled piece. (2) in the process of three-roll cross rolling, the cross section deformation of steel pipe is made of "peach tip" in the shape of circular triangle, (3) after full floating mandrel rolling, the internal thread of waste pipe is the shallower, the fixed mandrel is the second, and the tension mandrel is the deepest. With the increase of feed angle, the internal thread of waste pipe after rolling is deepened gradually, and the depth of internal thread of waste pipe after straight line rolling is lighter than that of linear rolling strip. (4) when the movement mode of mandrel changes from fixed mandrel to tension mandrel, the average relative value of uneven wall thickness of waste pipe increases gradually, from 2.756% to 3.385%; When the feed angle increases from 5 掳to 7 掳, the average relative value of uneven wall thickness of waste pipe increases from 3.796% to 4.196%.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE931.2;TG335.7
【参考文献】
相关期刊论文 前10条
1 尹元德;王孟军;李胜祗;陈汉骏;;皮尔格冷轧管横向壁厚精度分析[J];热加工工艺;2016年05期
2 徐海亮;于路强;杨力;穆树亮;米楠;;Assel轧机轧制过程的有限元模拟[J];冶金设备;2014年06期
3 涛雅;付玉艳;刘湖;;Assel斜轧钢管机组产品缺陷分析[J];包钢科技;2013年02期
4 袁方成;马金辉;黎福华;;Assel轧管机轧制薄壁Φ70mm×3mm合金结构钢管工艺研究和辊型改进[J];特殊钢;2013年02期
5 张冲;郝润元;陈俊杰;;三辊轧制过程建模与模拟[J];机械工程与自动化;2012年04期
6 元琳琳;双远华;刘江林;裴晋兴;;Assel斜轧生产线钢管主要缺陷及分析[J];重型机械;2011年01期
7 栗志红;;三辊轧管机轧制的钢管内螺纹缺陷分析[J];机械工程与自动化;2010年04期
8 刘启增;;Φ108mm Assel轧管机组技术装备改造[J];钢管;2010年04期
9 钱刚;胡旋;;Φ273mm Assel轧管机组生产薄壁无缝钢管的工艺开发[J];钢管;2010年03期
10 李金锁;王鑫;张玲;许U，
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