Bending and Tensile-Compressive Fatigue Test of Hinges in Pantograph Mechanisms made from Injection Molding Machine

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  • 射出成形製パンタグラフ機構における大変形ヒンジの繰返し引張・圧縮-曲げ疲労試験(OS7 マイクロメカトロニクス)

Description

A new surface mount system with a parallel arrangement of miniature manipulators was proposed for use in system down sizing. The miniature manipulator consists of a molded pantograph mechanism, which is composed of large deflective hinges and links, both made of the same materials. The complex and dynamic loads, that is, a combination stress of bending, tensile, compression and shearing stresses, occurs on each hinge in the pantograph mechanism. In these stresses, a hypothesis that bending and tensile stresses are the major factors in the fatigue damage of hinges is set up. On the hypothesis, tensile-compressive and bending conditions with hinge specimen as a fatigue test are carried out. The hinge specimen is made by the injection molding machine, and its material is polypropylene (PP) or the combination of PP and ethylene-propylene-rubber (EPT). By the fatigue test, the durability of hinge made of each material and the damage advance inside of the hinge are investigated experimentally.

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