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Generally, the adhesion of titanium alloys easily occurs between die and blank during press forming because the sliding and contact surface of die and blank with high surface pressure. In the case of titanium alloy sheets, it is especially difficult to prevent the adhesion. Thus, the various studies to prevent the occurrence of adhesion during press forming of titanium alloy sheets were carried out. For example, deep drawing with oil lubrication and with diamond-like carbon (DLC) coated die, it was difficult to prevent the adhesion, so the combination of DLC coated die and lubrication oil were utilised and the adhesion was prevented. Hence, it is necessary to develop the preventing method of the adhesion on die during deep drawing process. We have focused on the prevention of titanium surface oxide film peeling during deep drawing process to prevent the adhesion. We have developed the method to prevent the adhesion during dry deep drawing process. In this study, the compressed air was applied into die and the blank holding force with vibration technique was utilised during dry deep drawing of TP340 sheets. As a result, the occurrence of adhesion was prevented significantly by the application of developed methods.

Development of adhesion preventing method during deep drawing of TP340 titanium sheets