In this study, we investigated changes in the coefficient of friction between the material and the mold in order to improve the current low analysis accuracy in the molding process in which the material flows into the mold. First, we developed a new testing machine to measure the friction coefficient under high-speed, high-pressure conditions that simulate actual press molding. Test pieces were coated with press oil on both sides, attached to the testing machine's chuck, and the surface pressure was adjusted to an appropriate level by tightening the bolts. After confirming that the load cell signal was displayed on the monitor, the test pieces were pulled out at an appropriate speed using a servo press. The friction coefficient was derived from the holding load and pull-out load obtained here. As a result, surface pressure dependence was observed under all conditions of this experiment. This is thought to be because the lubricant is trapped in the uneven surface of the material, causing the friction coefficient to decrease. Furthermore, speed dependence was observed under some conditions. This is thought to be due to changes in the ease of lubricant flow caused by differences in test time.
MIYAUCHI et al. (Wed,) studied this question.
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