Durability of Large-Deflective Hinges made of Blend Polypropylene used for Molded Pantograph Mechanisms
A molded pantograph mechanism consisted of large-deflective hinges and links is used in a new surface mount system proposed by Horie, et al.(2000). To obtain long life, large-deflective hinges, we showed the method to conduct the repetitive tensile-compressive and bending test on a hinge specimen, and manufactured experimental equipment for a fatigue test. We also evaluated the test equipment and confirmed its effectiveness. The materials of the large-deflective hinge were selected as follows: (1) polypropylene (PP), (2) polymerization blend PP, (3) machine blend PP, and (4) another machine blend PP(+MAH-PP). The hinge specimen used for the fatigue test was made with the injection molding machine. From the relationship between the number of cycles leading to the fracture of the hinge and the repetitive tensile-compressive loads in the fatigue test, it has been confirmed that the difference in hinge thickness and the difference in the materials greatly influenced the inner damage of the hinges.
KeywordsFatigue Test Maleic Anhydride Fatigue Specimen Injection Molding Machine Elastomer Phase
Unable to display preview. Download preview PDF.
- M. Horie, T. Uchida, and D. Kamiya. A Pantograph Mechanism with Large-Deflective Hinges for Compact Surface-Mount System, Journal of Japan Society of Mechanical Engineers (Series C), Vol. 66, No. 648, 2804–2809, 2000.Google Scholar
- M. Horie, D. Kamiya, and M. Tomimatsu. Load Cyclic Characteristics of Large-Deflective Hinges in Moulded Pantograph Mechanisms with Hinges and Links, Proceeding of the Romansy2004, CD-ROM, 2004.Google Scholar
- Mounting Process Manual. Japan Robot Association, 1998 (in Japanese).Google Scholar
- M. Horie, M. Yamamoto, and D. Kamiya. Bending and Tecnsile-Compressive Fatigue Test of Hinges in Pantograph Mechanisms made from Injection Molding Machines, Procceding of the 6th International Conference on Electronics Materials and Packaging, 517–522, 2004.Google Scholar