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Marked improvement in tool life and stable production of high-precision products can be expected if a sintered polycrystalline diamond (PCD) or a boron-doped conductive diamond formed by chemical vapor deposition (CVD), which can be three-dimensionally shaped by electrical discharge machining, is used as a material for tools such as punches and dies for plastic working. In this study, friction and wear tests and shaving tests of these diamonds were first carried out to determine the wear resistance, adhesion resistance, and shock resistance of the diamonds. Therefore, the applicability of the diamond as a material for plastic working tools was examined. On the basis of the obtained findings, a diamond tool for deep drawing was fabricated and was used in deep drawing without lubricant. The results indicate that the limiting drawing ratio (LDR) of the developed diamond tool is higher than that of the conventional carbide tool. In the continuous deep drawing experiments using a progressive-type die without lubricant, defects such as scratches in the side wall of the products were observed after 20–30 repetitions of drawing using the conventional steel tool. In contrast, high-precision products, with the same precision as that of the first product, can be stably machined up to 5,000 repetitions of drawing using the diamond deep-drawing tool and demonstrate the efficacy of the developed diamond tool.

Deep drawing of 5052 aluminum alloy sheets using diamond tools without lubricant