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通过分析螺纹轴齿形成形过程,并结合金属流动特点,获得楔横轧梯形螺纹轴的成形机理.考虑到轧制过程轧件螺旋升角瞬时变化特点和成形段齿形截面变化等因素设计了楔横轧模具,采用有限元分析软件Deform-3D对楔横轧梯形螺纹轴齿形成形过程进行模拟,得到精度较高的梯形螺纹轴轧件.利用有限元点跟踪功能,对轧件多个点进行跟踪,详细分析了轧件螺纹不同位置各点的径向、轴向位移变化情况,从中获得螺纹段各处金属流动规律.采用软件模拟参数进行了相应的楔横轧实验,得到的梯形螺纹轴实验轧件与有限元模拟结果相同.模拟和实验结果表明,模具螺旋升角采用轧件瞬时半径对应螺旋升角时,能够轧制出形状精确的螺纹轴.
The formation mechanism of trapezoidal cross-wedge trapezoidal thread shaft is obtained by analyzing the forming process of thread shaft tooth profile and combining with the characteristics of metal flow.According to the instantaneous variation characteristics of helix angle during rolling and the change of profile section of forming section, Wedge cross-rolling mold, the finite element analysis software Deform-3D was used to simulate the trapezoidal cross-rolling trapezoidal thread shaft forming process, and the trapezoidal thread shaft rolling with high precision was obtained.Using the finite element point tracking function, Point, the radial and axial displacements at different points of the rolling thread were analyzed in detail, and the regularities of metal flow around the screw thread section were obtained.The corresponding wedge cross-rolling experiments were carried out by software simulation parameters.The trapezoidal The experimental results of the threaded shaft are the same as those of the finite element simulation.The simulation and experimental results show that the precise shape of the threaded shaft can be rolled out by using the instantaneous radius of the rolling stock corresponding to the helix angle.