Journal
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
Volume 102, Issue 5-8, Pages 2617-2632Publisher
SPRINGER LONDON LTD
DOI: 10.1007/s00170-019-03367-0
Keywords
Ductile-regime grinding; Nanoparticle jet minimum quantity lubrication; Zirconia ceramics; Friction coefficient; Minimum chip thickness; Ductile-brittle transition chip thickness
Funding
- National Natural Science Foundation of China [51575290]
- Major Research Project of Shandong Province [2017GGX30135, 2018GGX103044]
- Shandong Provincial Natural Science Foundation, China [ZR2017PEE011, ZR2017PEE002]
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The removal of material in the ductile regime while improving machining efficiency is currently the technical bottleneck in grinding zirconia ceramics. Prediction models of minimum chip thickness (h(min)) and ductile-brittle transition chip thickness (h(d-b)) were developed according to grinding mechanism. Results showed that both h(min) and h(d-b) decreased with increasing friction coefficient. Grinding experiments were carried out using the maximum undeformed chip thickness as the input parameter. Experimental results showed that the h(min) value in dry grinding is 0.24m. Meanwhile, the h(min) values under minimum quantity lubrication (MQL) and nanoparticle jet MQL (0.4, 0.8, 1.2, 1.6, and 2 vol.%) are 0.27, 0.34, 0.49, 0.65, 0.76, and 0.91m, respectively. Furthermore, the h(d-b) value in dry grinding is 0.8m, and the h(d-b) values under lubrication condition that corresponds to h(min) are 1.79, 1.98, 2.15, 2.27, 2.39, and 2.59m, respectively. The experimental results show the same trend as that of the prediction model. The theoretical calculation is basically consistent with the measured values, with model errors of 7.9% and 6.3%, thereby verifying the accuracy of the chip thickness models.
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