Research on Deformation Control Simulation for Micro-Factory

本文以研制微成形模拟器为目标，进行了理论和实验研究。具体讨论如下：1.宏观变形的澄清：由于微机械中使用的材料的尺度是几毫米，因此这种受到大变形的微结构材料应被认为是三维变形，如平面外变形，对于大尺度材料可以忽略不计。然后，通过对304不锈钢的实验，讨论了大变形过程中的二次效应.阐明材料内部结构的微观结构变化：应考虑材料内部结构的微观结构变化，建立塑性的微观本构模型。然后，采用超声无损材料评价方法，从晶体中的位错和几何变化两方面观察材料微观结构的特征变形。细观塑性本构模型的建立：在考虑材料初始各向异性的经典塑性本构模型的基础上，建立了宏观结构材料成形的塑性本构模型。然而，微成形的细观本构模型应考虑大变形引起的二次效应与材料内部微观结构变化之间的相互作用。将细观变形过程与宏观变形过程合理地结合起来，探讨了一种新的微成形本构模型.微成形过程模拟器的构建：结合上述3个方面建立的塑性本构模型，对微成形过程模拟器进行了探讨。阐明了将该模型纳入模拟器的问题，以便将该模型应用于更多的实际情况。

To aim at development of a simulator for micro-forming theoretical and experimental studies were conducted in this research. The discussions conducted are as follows:1. Clarification of macroscopic deformation: Since scale of materials used in micro-machines is a few millimeters, such micro structural material subjected to large deformation should be considered three dimensional deformations such as out-of-plane deformation, which can be neglected for large scale materials. Then, the secondary effect due to large deformation process was discussed from experiments used type 304 stainless steels.2. Clarification of micro structural change in internal structures of materials: A micro-constitutive model for plasticity should be constructed considering micro structural change in internal structure of materials. Then, characteristic deformation of materials for micro structure was bserved from both dislocations and geometric change in crystals using the ultrasonic nondestructive material evaluation method.3. Constructing micro constitutive model for plasticity: A plastic constitutive model for forming of macro structural materials is based on the classical plastic model considered the initial anisotropy of materials. However, micro constitutive model for micro forming should be considered the interaction between secondary effect due to the large deformation and the micro structural change in internal structure of materials. Then, a new constitutive model for micro forming process was discussed combining micro and macro deformation process reasonably.4. Constructing simulator for micro forming process: A simulator for micro forming process was discussed considering the micro constitutive model for plasticity constructed in above 3. The problems to incorporate the model into the simulator were clarified to apply the model to more actual cases.