From the development process of CNC bending machine mold, from the late nineteenth century to mid-twentieth Century, NC bending machine tool material to high-speed steel as the main representative; in 1927, Germany first developed a carbide bending machine mold material and access Widely used; the twentieth century, 50 years, Sweden and the United States were synthetic synthetic diamond, CNC bending machine cutting from this step into the super-hard materials, represented by the period. In the 1970s, polycrystalline diamond (pcd) was synthesized by high-pressure synthesis technology, which solved the problem that the number of natural diamond was scarce and expensive, and the application scope of diamond NC bending machine die was extended to aviation, spaceflight, automobile, Electronics, stone and other fields.