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攻丝属于最复杂的金属加工过程,因为需要同时保持几种尺寸、螺距和牙形角,此外,攻丝过程还与被加工材料的许多因素有关。随着材料强度的提高,切削力增大,从而提高了刀刃的负荷。如果此时螺纹延伸,则会使切削状况恶化,导致切屑收缩和挤压。攻丝的效率在很大程度上取决于刀具材料的性质。普通高速钢易产生碳化物偏析和碳化物分布不均匀的倾向,硬度只限于63—65HRC。用粉末冶金法制造的钴合金钢,例如EW9Co10制造的丝锥具有更高的强度、韧性和硬度(68HRC)。
Tapping is among the most complex metalworking processes due to the need to maintain several sizes, pitch and profile angles simultaneously. In addition, the tapping process is also linked to many factors in the material being processed. As the material strength increases, cutting force increases, thereby increasing the blade load. If the thread is extended at this time, the cutting condition will deteriorate, causing the chip to contract and crush. Tapping efficiency depends largely on the nature of the tool material. Common high-speed steel tend to produce carbide segregation and uneven distribution of carbide tendencies, the hardness is limited to 63-65HRC. Cobalt-alloyed steels made by powder metallurgy, such as those made by EW9Co10, have higher strength, toughness and hardness (68 HRC).