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箱体、架体、阀体等零件上的同轴孔系均有较高的精度要求,一般可采用悬伸镗削法、支承镗削法或调头镗削法进行加工。用悬伸镗削法镗孔时,安装在主轴上的刀杆悬伸在主轴箱之外,刀具镗削时,悬臂刀杆受到切削力矩、切削力以及刀杆自重的作用产生挠曲变形,其中径向分力P_v,与刀杆在该方向的位移y的比值称为刚度J。可计算得: J=P_v/y=3EJ/L~3。可知刀杆刚度与其长度立方成反比。刀杆长度越长,其刚度越小,不但影响孔的形状精度,不易控制孔的尺寸精度,而且更主要的会影响同轴度要求。支承镗削法镗孔时,镗杆穿过零件上的同轴孔
Box, frame, body and other parts of the coaxial hole system has a higher accuracy requirements, the general can use boring boring method, boring boring method or boring boring method of processing. When using boring boring boring method, the spindle mounted on the spindle overhang the spindle box, the tool boring, the cantilever arbor subject to cutting torque, cutting force and the role of arbor flexion deformation, The radial component P_v, and the displacement of the arbor in the direction of y ratio is called the stiffness J. Can be calculated: J = P_v / y = 3EJ / L ~ 3. It can be seen that the rigidity of the arbor is inversely proportional to the cube of its length. The longer the length of the arbor, the smaller its rigidity, not only affects the shape accuracy of the hole, difficult to control the dimensional accuracy of the hole, and more important will affect the coaxiality requirements. When boring boring boring is supported, the boring bar passes through the coaxial hole in the part