Abstract
Continuous blanking was carried out using polycrystalline diamond (PCD) tools without a lubricant with the aims
of developing the technologies required to apply these tools to shearing and of putting them to practical use. The
adhesion of an A5052 aluminum alloy sheet subjected to blanking to the PCD tools was markedly reduced compared
with that in the case of conventional SKD11 tools. It was also clarified that a high-precision sheared surface with
properties similar to those obtained in the first blanking can be obtained even after 10,000 times of blanking. In
addition, the adhesion of a SUS304 stainless-steel sheet to the PCD tools was prevented during the blanking, and the
wear resistance of the PCD tools was markedly improved as compared with that of conventional tools. The
properties of the sheared surface obtained after blanking 200,000 times were similar to those of the sheared surface
obtained in the first blanking. The burr height and inner and outer diameters of the workpiece obtained after
blanking 200,000 times did not change, demonstrating that high-precision sheared surfaces can be stably obtained.
The above results show that PCD tools can be practically used in blanking.
