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塑性成形大螺旋齿形轴类件与其现有的切削工艺相比,有着节材高效的明显优势,但其均匀分度成形难度大.轧制过程中轧件滚动半径的变化幅度较大,基于此建立与传动比相关联的模具辊型曲线的求解方程.通过有限元数值模拟,对轧制过程中模具和轧件传动比的变化规律进行研究,得到较为合理的转速比变化规律和模具辊型曲线形态.以螺杆阴转子为轧制对象,通过定轴横轧实验实现其非对称大螺旋齿形的均匀分度成形,成功解决大螺旋齿形均匀分度成形难的问题.
Compared with the existing cutting technology, the plastic-formed large helical gear shaft has the obvious advantage of high efficiency of material-saving, but the difficulty of uniform indexing is large, and the variation of the rolling radius of the rolling process is larger, This paper establishes the solution equation of the mold roller curve which is related to the transmission ratio.It studies the variation law of the transmission ratio between the mold and the rolling element through the finite element numerical simulation and obtains a more reasonable rule of the speed ratio change and the mold roller Type curve shape.With the screw negative rotor as the rolling object, the uniform indexing and forming of the asymmetric large helix profile can be realized by the rolling test of fixed axis, and the difficult problem of uniform indexing of large helical profile is successfully solved.