Forging of Heat Resisting Alloy with Ceramic Dies

本报告描述了一种用陶瓷制成的热抗性合金的新方法。为了开发一种用于陶瓷染料的非玻璃型润滑剂，对钛合金的环形形状特性的压缩测试在900 °左右的温度下被携带出一种新构造的装置，C.来自这些结果，它发现了一种润滑剂，即为陶瓷、SiC和硼腈提供了非常低的Friction<Al_2><O_3><Si_3><N_4>，而当硼腈的比率在20 - 30%的范围内。将这种润滑剂应用<Al_2>于<O_3>茶叶中，而不是玻璃型润滑剂通常用于等热加工中。通过比较所有陶瓷产品中的制冷剂的协同效应，它是明确<Al_2>的，因为显示了剩余的陶瓷中最低的制冷剂。确认了<O_3>新的成形方法的原则，一个由微型计算机开发的机械印刷机。塑料是由印刷机上的圆盘形状产品制成的。它是明确的，因为产品的形状取决于形成条件，即形成方法，而且它是必要的，可以确定牙齿的形状，以便平滑地完成产品的表面。塑料的定义是通过使用刚性-塑料有限元素方法和锻造测试进行分析的，以实现牙齿的各种形状。光滑的表面是由使用圆形角落的牙齿制成的。确切地说，应用柔性锻造系统的可行性是由陶瓷制成的耐热合金制成的。

This report describes a new forming method of heat resisting alloys in isothermal forging with ceramic dies.To develop a non-glass type lubricant suitable for ceramic dies, compression tests of ring-shape specimens of titanium alloys are carried out on a newly constructed apparatus at temperatures around 900゜C.From these results, it is found that a lubricant which consists of boric acid and boron nitride provides a very low friction for ceramic dies of <Al_2> <O_3> , SiC and <Si_3> <N_4> , when a ratio of boron nitride is in the range from 20 to 30%. Applying this lubricant with <Al_2> <O_3> dies, the lower friction than glass-type lubricant conventionally used in isothermal forging is obtained.By comparing the coefficients of friction for all the ceramic dies, it is clarified that <Al_2> <O_3> shows the lowest friction among the rest of ceramics.For confirming a principle of the new forming method, a mechanical press controlled by microcomputer is developed. Plasticine is formed to disk-shape product on the press. It is clarified that shape of product depends on forming conditions such as forming method, and it is necessary to determine shape of die teeth to finish surface of products smoothly. Deformation of plasticine is analyzed by using rigid-plastic finite element method and forging tests are carried out for various shapes of die teeth. The smooth surface is obtained by using dies with round corner.Conclusively, the feasibility of applying flexible forging system with ceramic dies to forming heat resisting alloys is clarified.