Experimental Study on High Speed Precision Grinding of QT700-2 for Auto Crankshaft
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摘要: 使用CBN砂轮对表面淬火汽车发动机曲轴球墨铸铁QT700-2材料进行了高速精密平面磨削实验研究,实验研究了磨削参数、材料去除率和最大未变形切削厚度与磨削力及比磨削能的关系,得到了磨削力和比磨削能的经验公式;在实验基础上结合曲轴磨削加工的要求进行了QT700-2材料高速精密磨削参数的优选,为汽车曲轴高速精密磨削奠定了良好基础。
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关键词:
- 汽车曲轴 /
- 球墨铸铁QT700-2 /
- 高速精密磨削 /
- 磨削力
Abstract: The high-speed precision surface grinding experiment of surface-hardened ductile iron QT700-2 for automotive engine crankshaft was carried out with CBN grinding wheel. The relationship between the grinding parameters, material removal rate, maximum undeformed chip thickness and the grinding force, specific grinding energy was studied. The empirical formula of grinding force and specific grinding energy is established. According to the requirements of crankshaft grinding, the high-speed precision grinding parameters of QT700-2 are optimized, which lays a foundation for high-speed precision grinding of automobile crankshaft.-
Key words:
- auto crankshaft /
- ductile iron QT700-2 /
- high speed precision grinding /
- grinding force
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表 1 试件材料QT700-2性能
牌号 化学成分/% 硬度 抗拉强度/MPa 伸长率/% C Si Mn 表面淬火QT700-2 3.5~3.7 2~2.5 0.7 HRC50-58 ≥700 ≥2 表 2 曲轴材料QT700-2磨削实验方案工艺参数
编号 磨削阶段 CBN砂轮型号 砂轮线速度Vs/(m·s-1) 工作台速度Vw/(m·min-1) 磨削深度ap/mm 1 粗磨 Winter1Winter2 90/120/140/160 1.0/1.5/2.0/2.5 0.05/0.10/0.15/0.20 2 精磨 Winter2ZKS3 60/90/110/130 1.0/1.5/2.0/2.5 0.010/0.015/0.020/0.025 表 3 粗磨阶段磨削深度为0.05 mm时的磨削力及比磨削能
砂轮线速度Vs/(m·s-1) 工作台速度Vw/(m·min-1) 单位法向磨削力Fn/(N·mm-1) 单位切向磨削力Ft/(N·mm-1) 磨削力分力比 比磨削能es/(J·mm-3) 90 1.0/1.5/2.0/2.5 13.2/14.8/16.6/20.1 2.5/2.7/3.1/3.8 5.36/5.42/5.35/5.28 26.68/19.66/16.74/16.42 120 1.0/1.5/2.0/2.5 12.9/14.0/15.4/13.7 2.1/2.3/2.8/2.5 6.14/6.09/5.50/5.48 30.24/22.08/20.16/14.40 140 1.0/1.5/2.0/2.5 10.9/12.5/14.0/15.5 1.8/2.0/2.2/2.4 6.06/6.25/6.36/6.46 30.24/22.40/18.48/16.13 160 1.0/1.5/2.0/2.5 10.5/11.9/12.1/13.0 1.8/2.0/1.9/2.1 5.83/5.95/6.37/6.19 34.56/25.60/18.24/16.13 表 4 精磨阶段磨削深度为0.01 mm时的表面粗糙度
砂轮线速度Vs/(m·s-1) 工作台速度Vw/(m·min-1) 表面粗糙度Ra/(μm) 60 1.0/1.5/2.0/2.5 0.46/0.52/0.48/0.52 90 1.0/1.5/2.0/2.5 0.54/0.50/0.51/0.51 110 1.0/1.5/2.0/2.5 0.55/0.62/0.57/0.59 130 1.0/1.5/2.0/2.5 0.48/0.48/0.55/0.52 表 5 磨削力及比磨削能经验公式回归分析
参数 拟合优度R2 标准误差S 显著检验值F P=0.01时F0.01 显著性 Fn 0.961 0.059 485 4.126 极显著 Ft 0.971 0.056 674 4.126 极显著 es 0.907 0.121 196 4.126 极显著 -
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