滚丝轮中径处螺纹升角的变化,造成滚压加工的零件质量差,甚至使滚压加工无法进行。今仅就滚丝轮螺纹中径处螺纹升角的变化,对螺纹滚压加工稳定性的影响进行分析。一、当滚丝轮与被加工零件中径处的螺纹升角一致时,二者应有如下运动关系。假定滚丝轮外径与工件接触处螺纹升角相等。在此假设条件下进行滚压加工时,滚丝轮螺纹升角λ_g与工件中径处的螺纹升角λ_e相等,即λ_g=λ_e,此时,滚丝轮与工件在中径处作纯滚动,所以零件与滚丝轮接触点A,在零件上沿自身螺旋线移动到C点(见图1),而在滚 Rolling wheel diameter at the thread angle changes, resulting in poor quality of parts rolling, or even rolling can not be carried out. Now, only the variation of thread angle at thread diameter of thread rolling wheel is analyzed, and the influence on the stability of thread rolling processing is analyzed. First, when the rolling wheel and the diameter of the workpiece is machined at the same angle of rise, the two should have the following movement relationship. It is assumed that the outer diameter of the rolling wheel is equal to the angle of rise of the thread at the contact of the workpiece. Under this assumption, when the rolling process, the thread rolling wheel angle λ_g and the workpiece diameter at the angle of rotation λ_e equal, that is, λ_g = λ_e, at this time, the rolling wheel and the workpiece at the center of pure rolling , So the part and rolling wheel contact point A, on the part along its own spiral to move to C (see Figure 1), and roll