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纵车外圆时,切削抗力使另件发生弯曲,並使加工表面得不到正确的圆柱形。另件因其挠度而引起的直径变化,主要决定于径向切削抗力P_y的大小。当切削量t=1.5至4公厘,s=1至4公厘/转时,产生的切削抗力很大,另件的挠度也很大。对于加工长度大、直径小的另件时,另件的挠度尤其显著。 [图一]所载的是挠度计算图。工件装在顶针上加工时,可以利用计算图来决定另件挠度的大小,它在实用上具有足够的准确性。另件用不同的方法装夾在机床上时,挠度的计算公式见[表一]。根据加工材料的性质,取低碳钢的弹性系数
Longitudinal cylindrical wheel, cutting resistance to the other parts of the bending, and the processing of the surface can not get the correct cylindrical. Another piece due to its deflection caused by the diameter changes, mainly determined by the radial cutting resistance P_y size. When the amount of cutting t = 1.5 to 4 mm, s = 1 to 4 mm / rev, the resulting cutting resistance is great, the other pieces of deflection is also great. For the processing of large length, small diameter parts, the other piece of the deflection is particularly significant. Figure 1 shows the calculation of deflection. Workpiece mounted on the thimble machining, you can use the calculation diagram to determine the size of the other pieces of deflection, it is practical enough accuracy. When the other piece is fixed on the machine by different methods, the calculation formula of deflection is shown in [Table 1]. According to the nature of processing materials, take the low carbon steel elastic modulus