单拐曲轴多向挤压模具的设计与优化

单拐曲轴多向挤压成形较传统生产方式大大缩短了工艺流程,实现了单拐曲轴的全流线成形,且批量生产对其模具设计也提出了更高的要求,针对单拐曲轴多向挤压工艺模具的特点,从模具的服役环境出发,对多向模具结构中镶块部分进行分析和优化。根据镶块分模面的位置不同,设计了"窄镶块"和"宽镶块"两种类型,通过数值模拟和实验验证的方法,进行了较深入的分析和对比。研究结果表明:采用镶块方式设计模具具有可行性,"宽镶块"模具结构具有较高强度和刚度;实验中窄镶块易出现"折痕"缺陷,而采用宽镶块结构有效避免了该类缺陷。镶块结构有助于降低单拐曲轴模具制造成本和提高产品质量。

Design and optimization on multiple direction extrusion die for single throw crankshaft

Multidirectional extrusion of single-throw crankshaft shortens the process greatly and realizes the whole streamline forming comparing with the traditional production method.At the same time, the new technology has also put forward higher requirements on die design in the mass production.According to the characteristics of the multidirectional extrusion die of single-throw crankshaft, the insert of multidirectional die was analyzed and optimized from the perspective of die service environment.Then, "thin insert" and "thick insert" were designed by different locations of the insert parting surface, and then analysis and comparison were carried out deeply by numerical simulation and experimental verification.The results show that the die designed with an insert is feasible.However, the die with thick insert has higher strength and rigidity, and folding can be avoided effectively.But the die with thin insert is easy to appear folding in the experiment.Thus, the die with an insert has important guiding significance to decrease the production cost of single-throw crankshaft and improve the product quality.