煤矿大型高锰钢托轮的新型刀具切削试验研究

采用新型复合SiC，Si3N4和TiN涂层硬质合金刀具对高锰钢进行了切削加工对比研究.试验条件为进给量0.3 mm/r，切削速度为0.5 mm，干切.测量了切削温度、后刀面磨损量与切削时间或切削速度的关系曲线，以及刀具前后刀面的显微磨损、破损形貌和化学变化.试验表明，复合SiC是切削高锰钢较理想的刀具，在切削效率和经济效益上均优于TiN涂层硬质合金和复合Si3N4刀具；高锰钢在脆化温度范围内（400～800 ℃）极易导致TiN涂层硬质合金和复合Si3N4脆性破裂，而复合SiC在此时仅发生机械磨损；在切削温度高于高锰钢的脆化温度时，复合SiC和复合Si3N4都会发生扩散磨损.

Cutting experimental study of new material tools for austenitic manganese steel riding wheel

The experimental tool materials for the steel cutting included compound SiC, compound Si3N4 and TiN coated carbide. On these conditions, load is 0.3 mm/r, cutting thickness is 0.5 mm and dry cutting, the relations between rear faces wear breadth and cutting time or cutting speed were measured separately. Wear and fracture microscopic features and chemical changes of them were analyzed by scanning electron microscope. The results show that the compound SiC tool is perfect to cut austenitic manganese steel, cutting efficiency and economic benefits of which is better than that of the TiN coated carbide and the compound Si3N4. Austenitic manganese steel causes the TiN coated carbide and the compound Si3N4 brittle fracture very easily when its within brittle temperatures（400~800 ℃). As to the compound SiC, it just produces mechanical wear within the same temperatures. When cutting temperature is higher than the brittle temperatures, the compound SiC and the compound Si3N4 both produce diffusion wear.