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多刃硬质合金刀具(如钻头、铰刀、端铣刀等)都是杆料制作的。这种杆料是通过挤压含增塑剂的混合粉末,并在1350—1400℃条件下烧结而成的。在杆料内部常存有暗伤(蜂窝、明显孔隙等),这些缺陷的产生与增塑剂分布不均有关。众所周知的磁力探伤法和超声波探伤法在生产中暂时还不能有效地达到实际的应用水平。因此,刀具制造者所制出的杆料只能在外观上符合于技术条件,而内部缺陷只能在毛坯
Multi-blade carbide tools (such as drill bits, reamers, end mills, etc.) are made of rod material. This material is obtained by extruding a mixed powder containing a plasticizer and sintering it at 1350-1400 ° C. There are often hidden wounds (honeycomb, apparent porosity, etc.) in the interior of the rod material. These defects are related to the uneven distribution of the plasticizer. Well-known magnetic detection method and ultrasonic flaw detection method in production can not yet effectively achieve the actual level of application. Therefore, the cutter made by the rod material only in appearance in line with the technical conditions, and internal defects can only be rough