铜、钢质细长管件广泛的应用在机械和微波技术上。管的加工方法分拉制和车制,由于机加工过程中产生应力和加工误差,使管件弯曲变形,而拉制的管直线度较差。对内孔的直线度和同轴度要求高的管件,如管件长度大于300mm,直线度为0.015mm时,还要进行校直,传统方法是以管外圆为基准进行校直。因为机械加工误差,校直以后营内孔直线度也难以达到要求。因此对内孔直线度要求高的管件,应以内孔为标准来校直,但有的小管内 Copper, steel slender pipe is widely used in mechanical and microwave technology. Tube processing method points drawn and car system, due to the machining process of stress and machining errors, the pipe bending deformation, and drawing the pipe straightness is poor. For the hole of the straightness and high concentricity requirements of the pipe, such as the pipe length is greater than 300mm, straightness of 0.015mm, but also for alignment, the traditional method is based on the outer cylindrical tube alignment. Because of machining errors, straightening the camp hole straightness is difficult to meet the requirements. Therefore, the requirements of the straightness of the inner hole of the pipe should be calibrated to the standard bore, but some small tube