摘要
本文从一些基本的物理假设及塑性力学基本理论出发,运用 Backofen 超塑性本构方程,推导了典型超塑板材型腔胀型全过程的最佳加压规律。根据对变形假设的修正,对自由胀形、贴模及充填阶段的最佳加压规律曲线进行合理的连接。用TP801B单板机及其他硬件组成的控制系统,实现了板材型腔吹塑成型全过程平滑、全自动控制。
Based on some physical assumptions and the fundamental theory of plasti-city, Backofen's constitutive equation was used to derive the optimal time-dependent forming pressure in a typical superplastic sheet bulging processwithin a cavity. With deformation models modified appropriately, the pressurevs. time curves in three subsequent phases,i.e.,free bulging,closing up to innersurface of the cavity and corner filling, could thus be reasonably and smo-othly joined as a continuous relationship. To justify the theoretical consider-ation, a control system composed of a TP801B single--board computer andother hardwares was set up, and a fully automatic and smooth control wasattained with the system to show the whole process of blow moulding withina cavity.
关键词
板材
超塑胀型
加压规律
压力加工
superplastic bulging
optimal strain rate
optimal time-dependent forming pressure
constitutive equation
