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我们曾加工过如图1所示的细长丝杠,其长度与螺纹中径比值为148左右,材料为45号钢,调质至HRC28～30。加工这类细长丝杠的困难确实很多,我们采取了一些措施,使加工后的丝杠达到了各项技术要求。现将我们的点滴体会介绍如下。一、刀具由于细长丝杠刚性很弱,为减少振动和变形,必须尽量减小切削力,这也是我们在考虑刀具诸因素时的基本出发点。刀具参数如下: 外圆粗车刀:主偏角90～92°,副偏角5～7°,前角30°,后角10°,刀尖有R0.2～R0.3的圆弧,它起到了相当于倒棱的作用,可以增加主切削刃的强度。外圆精车刀:主偏角45°,副偏角45°,前角30°,后角12°。
We have processed as shown in Figure 1, the elongated screw, the ratio of its length to the diameter of the screw diameter of about 148, the material is 45 steel, quenched and tempered to HRC28 ~ 30. The difficulty of processing such elongated leadscrew is indeed a lot, we have taken some measures to make the screw after processing to meet the technical requirements. Now let’s understand the following introduction. First, the cutter As the elongated screw is very weak, in order to reduce the vibration and deformation, we must minimize the cutting force, which is also the basic starting point when we consider the various factors of the cutter. Tool parameters are as follows: Round roughing knife: the main declination angle of 90 ~ 92 °, the declination angle of 5 ~ 7 °, 30 ° rake angle, rear angle 10 °, nose R0.2 ~ R0.3 arc, It functions as a chamfer to increase the strength of the main cutting edge. Cylindrical finishing tools: the main declination 45 °, declination 45 °, rake angle 30 °, rear angle 12 °.