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应用高性能硬质合金、陶瓷刀具和CBN刀具对常温条件下难以加工的高硬堆焊材料进行加热切削试验。试验结果表明:尽管加热条件下冲击效应降低,但CBN刀具仍然破损严重;陶瓷刀具虽然也无法实现理想的切削,但切削过程中刀具破损模式从崩碎式失效转变为磨损失效;3种刀具中高性能硬质合金应用效果最佳,其最佳参数条件下,一个切削里程后刀面VB值仅为0.3 mm,试验过程中,刀具磨损随表面加热温度、切削速度、切削深度的提高而增大,但随进给量取值的增大而减小,其中切削速度对刀具VB值的影响最大,而进给量和削切深度对刀具VB值的影响较小。综合分析还表明:试验中刀具磨损速率仍然受刀具红硬性极限的限制。
The application of high-performance cemented carbide, ceramic tool and CBN tool to heat-cut high hardfacing materials which are difficult to process under normal temperature conditions. The results show that the CBN tool is still damaged seriously even though the impact effect is reduced under heating conditions. Although the ceramic tool can not achieve the ideal cutting, the tool breakage mode changes from collapse failure to wear failure during cutting. Performance Cemented Carbide has the best application effect. Under the optimal parameters, the VB value of the flank face of a cutting distance is only 0.3 mm. During the test, the tool wear increases with the increase of the surface heating temperature, cutting speed and cutting depth , But decreases with the increase of the feed value. The cutting speed has the most influence on the VB value of the tool, while the feed rate and the cutting depth have little influence on the VB value of the tool. The comprehensive analysis also shows that the tool wear rate in the test is still limited by the tool red hardness limit.