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为消减圆柱坯料自由锻冲孔工件的“走样”缺陷,且高度保持与圆柱坯料冲孔相当,以Φ60mm×55mm坯料为例,取孔径比为2.50,2.75和3.00,通过Deform-3D软件模拟,得到预成形坯料形状为:外围高度需增加9.1%～3.8%,上端需做出与对应冲子直径之比为27.1%～24.0%的凸起,上端外径基本不变,下端外径需减小14.2%～9.3%,上下端之间呈卡腰状。用预成形坯料冲盲孔及冲穿孔,形状精度明显提高(孔径比为2.50时冲盲孔,工件上端面平面度由6.3mm提高到0.6mm,外侧表面圆柱度由5.9mm提高到0.4mm)。最后进行了物理模拟实验验证,可为实际生产应用提供参考。
In order to reduce the “sample ” defect of free-forging punched workpiece in the cylindrical blank and maintain the height of punching of the cylindrical blank, taking the Φ60mm × 55mm blank as an example, taking the aperture ratios of 2.50, 2.75 and 3.00, through Deform-3D software The shape of the preform is obtained by the simulation: the height of the periphery needs to be increased by 9.1% ~ 3.8%, the height of the punch with the corresponding punch diameter is 27.1% ~ 24.0%, the upper outer diameter is basically unchanged, the lower outer diameter Need to reduce 14.2% ~ 9.3%, between the upper and lower card waist shape. Blind punching and punching through the preform are used to improve the shape precision (the blind hole is punched when the aperture ratio is 2.50, the flatness of the upper end surface of the workpiece is increased from 6.3mm to 0.6mm, the outer surface cylindricality is increased from 5.9mm to 0.4mm) . Finally, the physical simulation experiment verified, can provide a reference for the actual production and application.