Model construction and experimental research on end grinding force of SiCp/Al composites
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摘要: 针对SiCp/Al逐层磨削两相三维重构需要精密高效端磨的问题,基于单颗磨粒磨削SiCp/Al的磨削力,在考虑切屑变形力、摩擦力、SiC颗粒断裂破碎力的基础上,建立SiCp/Al的端磨磨削力解析模型,结合试验研究切削速度、工件进给速度和轴向磨削深度等参数对加工表面粗糙度的影响规律,并探讨SiCp/Al金相表面快速磨削的加工工艺。结果表明:构建的端磨磨削力解析模型与试验的法向磨削力Fn的总体平均误差为12.98%,切向磨削力Ft的总体平均误差为3.49%;表面粗糙度随切削速度增大而减小,随进给速度和轴向磨削深度的增大而增大;用磨料颗粒基本尺寸为13.0 μm的磨具,经过6次磨抛获得良好金相表面,所需磨削加工时间为600 s,可实现SiCp/Al金相表面的快速磨削。Abstract: Aiming at the problem that precision and efficient end grinding is required for the two-phase 3D reconstruction of SiCp/Al grinding layer by layer, an analytical model of end grinding force of SiCp/Al is established based on the grinding force of SiCp/Al grinding with a single abrasive particle, considering the chip deformation force, friction force and the breaking force of SiC particles. The effects of cutting speed, workpiece feed speed and axial grinding depth on the surface roughness were studied by experiments. The machining technology of SiCp/Al metallographic surface rapid grinding was also discussed. The results show that the overall average error between the analytical model of end grinding force and the experimental normal grinding force Fn is 12.98%, and that the overall average error of tangential grinding force Ft is 3.49%. The surface roughness decreases with the increase of cutting speed and increases with the increase of feed speed and axial grinding depth. The grinding time for obtaining a good metallographic surface is 600 s after 6 grinding times with a grinding tool of 13.0 μm grain size. The rapid grinding of SiCp/Al metallographic surface can be realized.
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Key words:
- precision grinding /
- grinding force model /
- SiCp/Al /
- metallographic surface
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表 1 系数确定用试验参数
Table 1. Test parameters for coefficient determination
编号 切削速度
vs / (mm·s−1)进给速度
vw / (mm·s−1)径向磨削深度
ap / mm轴向磨削深度
b / mm1 1 253.46 0.03 3 0.005 2 1 253.46 0.05 3 0.008 3 3 313.65 0.05 3 0.008 4 3 313.65 0.03 3 0.008 表 2 dav与vw对应表
Table 2. dav and vw corresponding table
vw / (mm·s−1) 0.02 0.03 0.04 0.05 dav / mm 5.994 5.991 5.988 5.985 表 3 各试验系数参数值
Table 3. Parameter values of each test coefficient
系数 数值 K1 2.735 291 788 × 107 K2 6.516 577 4 × 107 K3 4.055 336 × 106 K4 32.68 K5 5.888 781 × 106 K6' 1.118 88 × 107 K7' 3.164 09 × 107 表 4 试验参数
Table 4. Test parameters
编号 切削速度
vs / (mm·s−1)进给速度
vw / (mm·s−1)轴向磨削深度
b / mm径向磨削深度
ap / mm1 1 253.46 0.05 0.005 3 2 1 880.19 0.05 0.005 3 3 2 506.92 0.05 0.005 3 4 3 313.65 0.05 0.005 3 5 1 253.46 0.02 0.005 3 6 1 253.46 0.03 0.005 3 7 1.253.46 0.04 0.005 3 8 1 253.46 0.05 0.005 3 9 1 253.46 0.05 0.004 3 10 1.253.46 0.05 0.006 3 11 1 253.46 0.05 0.008 3 12 1 253.46 0.05 0.00 3 -
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