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针对闭挤式精冲模具型腔压力大的特点,提出了降低型腔压力的分流降压腔设计思路,并采取了分别在模具和坯料上设置分流降压腔的方案。以35钢直齿轮的闭挤式精冲为对象,采用Deform-3D有限元软件分别模拟了在坯料和凸模上设置半径为1~8 mm的分流降压腔,以研究其对型腔压力的调节作用以及其对零件成形质量的影响。分析表明,坯料上设置分流降压腔能更有效降低模具在径向和切向的受力,且分流降压腔半径不易过大,恰当的降压腔半径能减少齿形件齿顶开裂。此外,为减少干摩擦,提出了在模具相应位置设置润滑油存储结构。最后,设计了带有分流降压腔和润滑结构的实验模具,并通过实验检验了模具的实用性。
Aimed at the large cavity pressure of closed-punching fine blanking die, the design idea of reducing the pressure of the splitter supressing chamber was put forward. Taking the closed-crowded fine blanking of 35 steel spur gear as an example, the Deform-3D finite element software was used to simulate the shunt decompression chamber with a radius of 1 ~ 8 mm on the blank and the punch, respectively, to study the effect on cavity pressure The role of regulation and its impact on the quality of parts forming. The analysis shows that setting the shunt buck chamber on the billet can effectively reduce the radial and tangential force of the die, and the diameter of the shunt buckling chamber is not easy to increase. The proper buckling cavity radius can reduce the tooth tip dehiscence. In addition, in order to reduce the dry friction, it is proposed to set the lubricant storage structure at the corresponding position of the mold. Finally, the experimental mold with split pressure relief cavity and lubrication structure was designed, and the practicability of the mold was tested through experiments.