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Researches about micro technology travel lively in these days. Such many researches are concentrated in the field of materials and a process field. But properties of micro materials should be known to give results of research developed into still more. In these various material properties, reliability data such as mechanical, optical, thermal property, etc is the basic property. In this paper, it is measured that is material properties of main BLU(Back Light Unit) components in LCD(Liquid Crystal Display). The pattern shape of prism sheet, diffuser film and reflective plate are measured by variable 3D scanning equipments. It is researched which is the method to measure an optimal 3D pattern shape in each components.
There have been strong demands for micro size screw with high precision due to miniaturization and integration trends for electronic products such as Hard Disk Drives. The thread rolling process for screw manufacturing are lower unit cost, reduced material utilization, and superior mechanical properties compared to the machining process. But little work has been done on the thread rolling of micro size screw. In this paper, we investigate thread rolling process using Finite Element Analysis (FEA) and parameter study for screw. In this paper, we investigate thread rolling process using Finite obtain the material property and to implement into the FE tool for the numerical simulation. In case that parameter of relative position of dies is half length of pitch for maintaining the continuous thread profiles, we found that shear friction factor was 0.9 during the thread rolling process using FEA. We are trying to develop the thread rolling process using the FE-simulation to manufacture screws which have been commonly produced from the industrial level fabrication at present.
This paper deals with the typical evaluation of hardening models of ANSI410 stainless steels for the thread rolling simulation of micro-screws. Comparison tests of the material were firstly carried out in order to obtain the stress-strain curves. The curves were then interpolated with Ludwick equation and Hockett-Sherby equation. Interpolation results indicates that Hockett-Sherby model provide relatively well description for the hardening behavior of ANSI 410 steel. Both simulations and experiments were finally conducted to verity the hardening equation. The results fully demonstrate that Hockett-Sherby model is more suitable for the FE simulation of thread rolling process for ANSI 410 micro-screws.
This paper presents the fabrication of inchworm motor for high precision actuator system of large displacement and high force. The inchworm motor consist of a extending actuator that provides displacement of tool guide, and two clamping actuators which provide the holding force. PZT element have low tensile strength and shear. So often fail under tensile and shear stress. To prevent failure, the pre-load housing was designed and fabricated to the optimal design condition according to the variation of the hinge stiffness by FEM(Finite Element Method) analysis. This is open-loop control and input voltage signals are three square wave of 50~60 percent duty cycles at each of the PZT elements. Also the dynamic characteristics of the system was verified by experiment results of the inchworm motor.