双向拉伸薄壁管成型中冷却条件的影响分析

Analysis of the Effect of Cooling Conditions on Biaxially Oriented Tubes

围绕双向拉伸薄壁管工艺技术中冷却条件对某些变形参数,如轴向拉伸比、环向扩张比、壁厚分布、强度等的影响进行了综合分析。数据说明拉伸后的快速冷却有利于管的尺寸稳定和直线度改善。拉伸时的自然冷却会产生不均匀的产品,快速水冷却拉伸工艺能显著改善管的耐环境应力开裂性,成倍提高其强度。轴向拉伸比和环向扩张比要合理匹配。

The effect of cooling conditions on some deformation parameters in the process for biaxially oriented tubes,such as axial drawing ratio,hoop extension ratio,thickness distribution and strength,etc. was explored. It showed that a fast cooling after drawing was of benefit to dimensional stability, straightness, environmental stress cracking resistance, and strength of the drawn tubes. The axial drawing ratio and hoop extension ratio should be properly matched.