新型刀具材料切削大型高锰钢托轮的试验研究

Cutting Experimental Analysis of Austenitic Manganese Steel Riding Wheel with Advanced Material Tool

用于露天煤矿大型托轮的高锰钢属于难加工材料。本文采用新型复合SiC、复合Si3N4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。试验表明:复合SiC刀具是切削高锰钢的较理想刀具,在切削效率和经济效益上均优于TiN涂层硬质合金和复合Si3N4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Si3N4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Si3N4都会发生扩散磨损。

Austenitic manganese steel, which serves as large riding wheel at opencut coal mine, belongs to hardworking material. The cutting contrast experiments of austenitic manganese steel with compound SiC, compound Si3N4 and TiN coated carbide are researched. The results show that compound SiC tool is perfect to cut austenitic manganese steel, the cutting efficiency and economic benefit of which are better than that of TiN coated carbide and compound Si3N4. Austenitic manganese steel causes brittle fracture of TiN and compound Si3N4 coated carbide very easily when it is within brittle temperature(400℃～800℃),while compound SiC just produces mechanical wear within the same temperature. When cutting temperature is higher than the brittle temperature, both compound SiC and compound Si3N4 produce diffusion wear.