高硬再制造表面强化层的加热切削研究

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0．3mm，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。

Heat Cutting for High Hardness Remanufacture Deposited Materials

Three cutting tools, YG610 high-performance hard alloy, Si3N4 ceramic tool and CBN are adopted for heat cutting deposited materials. The test results show that though the impacts to the tools are reduced, the CBN is still damaged seriously. The condition by Si3N4 ceramic tool is better than CBN, whose types of tool failure change from breakage to wear. The YG610 is the best material for heat cutting, whose minimum VB value is only 0.3 mm. In the test, the wear increases with the increasing of heating temperature, cutting speed and cutting depth. But it decreases with the feed rate. The cutting speed influences most on the VB value of the cutting tool while the feed and the cutting depth influence less. The comprehensive analysis also shows that the wear rate is still restricted by the red-hardness limit.