Ultrasonic Spindle Research Articles

Ultrasonically Assisted Machining for Mirror Finishing of Die (1st report)

Dies for injection molding parts such as cellular phones and light conductive parts require a high quality surface finish in terms of both appearance and integrity. In order to finish dies, manual polishing by a skilled worker has required after machining processes; such as EDM and milling. But the manual polishing causes poor flatness of dies and time consuming then expensive. So it is desired to establish a machining process to finish dies without manual polishing. In this study, a 3D positioning machine equipped with an ultrasonic spindle was used for grinding experiments. Electroplated diamond tools were equipped. Generally, diamond tool cannot grind steel because of the terrible wear due to chemical reaction between diamond and steel. However, ultrasonically assisted grinding can make fine surface (0.4∼0.84μmRz) of die steel, without observable tool wear. Effects of tool feed rate, radial depth of cut and axial depth of cut were investigated.

Study on mirror surface grinding of die steels by using ultrasonically assisted diamond tool(Grinding technology)

This paper describes ultrasonically assisted grinding for injection die steel using diamond abrasive tools. In this study, a 3D positioning machine equipped with an ultrasonic spindle carried out grinding experiments. Generally, diamond tools cannot grind steel because of the terrible wear due to chemical reaction between diamond and steel. However, ultrasonically assisted grinding can make fine surface (roughness Rz is 0.4〜0.84μm) of die steel, without severe tool wear. Effects of tool feed rate, radial depth of cut and axial depth of cut were investigated.