“镦锻”的英语？

“镦锻”的拼音为：dūn duàn...

介绍了石油钻杆端部镦锻加厚工艺基本原理及加厚方式.The basic principle and the method of oil drill pipe end upsetting process were presented.本文介绍了先进的TR镦锻法制造曲轴毛坯的工作原理.The paper introduces the working principle in making crankshafts by using advanc...