Ultrasonically Assisted Machining for Mirror Finishing of Die (3rd report):—A Research of Effects of Cutting Edge Truncation on Grinding Phenomenon—

概要

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Dies for injection molding parts such as key sheet and body of cellular phones require high quality surface finish in terms of both appearance and integrity. Manual finishing is an important for die manufacturing process, which decides the surface roughness of a die and affects the accuracy of its shape. However, manual polishing consumes several days to finish the die surface. Therefore, high precise die milling or grinding technique which achieves mirror surface finish is requires, in order to minimize polishing operation. In the previous report, ultrasonically diamond grindings realized mirror surface finish of die mold. It was confirmed that cutting edge truncation before grinding is necessary to obtain mirror surface. In this study, effect of depth of cutting edge truncation was considered to establish grinding parameters for mirror surface finish. Furthermore estimation method for determination of optimal truncation depth by measuring thrust force and torque during grinding was investigated.