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为了在各类仿型铣床上加工预硬化钢及调质钢的模具零件,过去大都采用进口高速钢铣刀。因为这种钢材的硬度在300～400HB之间,用一般国产高速钢铣刀难以切削。北京模具厂采用北京科技大学研制的超
In order to process various types of milling machine pre-hardened steel and quenched and tempered steel mold parts, the past mostly imported high-speed steel milling cutter. Because of the hardness of this steel between 300 ~ 400HB, with the common domestic high-speed steel cutter difficult to cut. Beijing Mold Factory developed by Beijing University of Science and Technology ultra