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近十年来,在孔加工,特别是钻削方面,尚未获得显著进展。这主要是由于普通麻花钻的结构和加工方法不能满足硬质合金所需要的加工条件。按DIN8037所规定的锒硬质合金刀片的麻花钻,从结构方面来看,没有显著提高切削效率的条件。一般硬质合金在中断切削及刀片局部超负荷的情况下(例如工件具有坚硬的夹杂物),常常会出现崩刃,它与刀具本身的磨损不同,特别对于耐磨的硬质合金来说,对此特别敏感。当刀片承受的负荷和切削热分布不均匀或温度变化时,刀刃常常会出现热裂纹和梳状裂
In the last decade, no significant progress has been made in hole machining, especially drilling. This is mainly due to the structure and processing methods of ordinary twist drills can not meet the processing conditions required by cemented carbide. According to DIN8037 锒 tungsten carbide blade twist drill, from the structural point of view, there is no significant increase in cutting efficiency conditions. General cemented carbide interrupt cutting and blade in the case of local overload (for example, the workpiece has a hard inclusion), chipping often occurs, it is different with the wear of the tool itself, especially for hard-wearing carbide, Particularly sensitive to this. When the blade to withstand the load and cutting heat distribution is uneven or temperature changes, the blade often appear hot cracks and comb cracks