Micro deep drawing of cylinder cups is a reliable mass production and low cost process if the forming parameters are reasonably chosen. Micro cups with a drawing blank diameter of 2 mm were formed and the effects of lubrication conditions on micro deep drawing were studied. The specimen material was copper alloy Cu-FRHC with a thickness of 40 lm which was thermally treated at 873 K for 12 h in nitrogen atmosphere. The experiments were carried out at room temperature on a universal testing machine without lubrication and under the lubrication of polyethylene (PE) film, soybean oil, and castor oil at a drawing velocity of 0.1 mm/s. The results showed that the micro cups were formed accurately with a minimum diameter of 0.9 mm. The PE film which results in the minimum drawing force, maximum limit drawing ratio (LDR), and good surface quality was better than other lubrication conditions and can be chosen as a proper lubricant in micro forming.
Electromagnetic micro-punching is a novel micro-punching process in which metal foil occur plastic deformation until shear fracture under magnetic impact load. In this paper, electromagnetic micro-punching process was investigated on T2 copper foil. Effects of discharge energy, foil thickness and discharging time on micro punching were discussed. The results show that micro holes were successfully pierced with the discharge energy more than 5.0 kJ on copper foil of 20 μm in thickness. Foil thickness is the main factor in electromagnetic micro-punching with the discharging energy of 7.2 kJ. In addition, increasing discharging time can punch micro hole on thicker foil. The micro holes with diameter of 0.4-1.4 mm were successfully punched on 20 μm copper foil in thickness with discharge energy of 7.2 kJ.
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