Numerical simulations of grinding force and surface morphology during precision grinding of leucite glass ceramics
Numerical simulations of grinding force and surface morphology during precision grinding of leucite glass ceramics
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白榴石微晶玻璃精密磨削过程中磨削力和表面形貌的数值模拟
DOI：
10.1016/j.ijmecsci.2022.107562
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发表时间：
2022-07
影响因子：
7.3
通讯作者：
Guojun Dong
中科院分区：
文献类型：
--
作者：
Yong Zhang;Tao Wu;Chen Li;Yongfei Wang;Yanquan Geng;Guojun Dong
白榴石微晶玻璃是一种高性能的义齿材料，具有较高的机械强度、良好的透光性和良好的生物相容性。玻璃陶瓷义齿必须采用精密磨削技术进行加工，以获得满意的表面完整性。为了解磨料与工件之间的接触相互作用，建立了白榴石微晶玻璃磨削过程中磨削力的理论模型，该模型考虑了弹性-韧性转变深度、脆性-韧性转变深度、应变率效应以及磨料位置和尺寸的随机分布。此外，还建立了白榴石微晶玻璃磨削过程中材料去除和变形行为的表面形貌模型，该模型考虑了脆性-韧性转变深度、弹性回复以及磨粒位置和尺寸的随机分布。采用纳米压痕和纳米划痕试验对模型中白榴石微晶玻璃的力学性能进行了测试。通过白榴石微晶玻璃的磨削实验验证了模型的准确性，结果表明，力模型和表面形貌模型的预测误差分别在10%和15%以内。理论和实验结果均表明，小磨料粒度、低进给速度、小磨削深度、高磨削速度有利于提高表面质量，大磨料粒度、低进给速度、小磨削深度、高磨削速度有利于降低磨削力。研究结果为硬脆材料高效精密磨削过程中工艺参数的优化提供了理论指导。
Leucite glass ceramics are high-performance denture materials due to their high mechanical strength, excellent light transmittance, and excellent biocompatibility. Glass-ceramic denture must be processed using precision grinding technology to achieve a satisfactory surface integrity. To understand the contact interaction between the abrasives and workpiece, a theoretical model of grinding force during grinding of leucite glass ceramics was developed by considering elastic-to-ductile transition depth, brittle-to-ductile transition depth, strain rate effect, and random distributions of the abrasive position and size. In addition, a surface morphology model was developed to understand the material removal and deformation behaviors during grinding of leucite glass ceramics, which considered the brittle-to-ductile transition depth, elastic recovery, and random distributions of the abrasive position and size. The mechanical properties of leucite glass ceramics used in the models were measured by nanoindentation and nanoscratch tests. Grinding experiments of leucite glass ceramics were performed to verify the accuracy of the models, and the results showed that the predicted errors of the force and surface morphology models were within 10% and 15%, respectively. Both theoretical and experimental results demonstrated that small abrasive size, low feed speed, small grinding depth, and high grinding speed were beneficial to improving the surface quality, and large abrasive size, low feed speed, small grinding depth, and high grinding speed were beneficial to decreasing the grinding force. The results will provide a theoretical guidance for optimizing process parameters during high-efficiency and precision grinding of hard and brittle solids.
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