外加厚油管加厚端常见质量缺陷及分析

Common Quality Defects of Upset End of External Upset Tubing and Relevant Analysis

总结了外加厚油管加厚端常见表面质量缺陷的类型,包括:外表面凸棱、结疤,端头耳子、凹槽,内表面环状凹坑等;并分析了缺陷的产生原因。分析认为:通过降低夹紧力可减小外加厚油管加厚端的凸棱厚度,而选取合适的镦粗力、调整加热温度和时间、改善润滑冷却效果,可减少端头耳子、内表面环状凹坑和外表面结疤等缺陷的出现。

Summarized here in the paper are types of the common surface quality defects of upset end of the external upset tubing, including ridge, scar, end-fin, and pit as occurring on the pipe＇s outer surface and inner surface circular pit, etc. Causes for such defects are analyzed. Accordingly, it is concluded that the ridge thickness could be reduced by means of decreasing the clamping force, and defects like end-fin, inner surface circular pit and outer surface scar, etc. could be eliminated via such measures as determining appropriate upsetting force, adjusting heating temperature and duration, and improving lubrication and cooling efficiencies.