Proceedings of JSPE Semestrial Meeting

Show abstractHide abstract

Single crystal Lithium titanate (LiTaO3 or LT) is a typical multi-functional material that the physical properties exhibits extraordinary piezoelectricity and pyroelectricity. It has been utilized in numerous appliances, such as force sensors, thermal sensors and SAW (surface acoustic wave) filter. Due to piezoelectric and pyroelectric properties, LT single crystal undergoes structure phase transition when the temperature are changed. Therefore, its properties may effect on ferroelectric material grinding process that the cracks initiate in wafer and break it. However, detailed summaries of LT physical properties is not readily available yet. Thus, the objective of this study is to demonstrate influence of structure phase transition effect on mechanical property of single crystal Lithium titanate material. Designing a Nano-indentation experiment obtained the relation between K1c and temperature gradient. The theory has the potential to be further extended to LT materials grinding process.

View full abstract

Download PDF (875K)

When an electric current is supplied in a magnetic field, Ampere force occurs in the direction that is perpendicular to direction of the electric current and the magnetic field. The purpose of this study is to develop the bearing using Ampere Force. By setting magnets around a bearing and suppling an electric current to a shaft in the magnets, Ampere force is occurred on the shaft. The shaft is floated by the force and it is avoided from contacting with the inner surface of the bearing. This proposed bearing was produced experimentally.

View full abstract

This study deals with a feedback-controlled precision machine system based on six-degree-of-freedom (6 DOF) relative motion errors between the tool and workpiece, which are measured by a hexapod-type measurement device. The device installed between the tool spindle and surface plate measures the relative motions because the hexapod consists of six passive extensible struts equipped with linear scale units. This paper describes length measurement accuracy compared with a laser interferometer length measurement system in a test apparatus when a strut is expanded and contracted in the linear motion stage. We show measured repeatability and systematic error of the length measurement. Moreover, effects of angular motions of the linear scale unit on the length measurement error is discussed.

View full abstract

Register with J-STAGE for free!