Abstract
This study proposes a methodology for helical mill-grinding of tiny internal threads made of hard brittle materials such as SiCp/Al composites. The methodology uses the helical mill-grinding method incorporating with a diamond form-grinding wheel. A mathematical model is established to predict thread form errors and provide a rational range of wheel parameters, such as variation of tool profile angle Δα and ratio of the wheel diameter to the thread major diameter η. Based on the methodology, a grinding wheel is developed for processing the M2 internal threads in a validation experiment. The study demonstrates that an M2 internal thread made of the SiCp/Al composite of 45% SiC volume fraction is successfully machined in 5 min with pitch error <0.08% and angle error <0.3%. The thread profile on the pitch diameter is within the axial equivalent tolerance zone (0–0.016 mm), which indicates that the thread precision reaches the H4 level.
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Gao, H., Lu, S., Yang, A. et al. A methodology for helical mill-grinding of tiny internal threads made of hard brittle materials. Int J Adv Manuf Technol 91, 25–37 (2017). https://doi.org/10.1007/s00170-016-9727-5
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DOI: https://doi.org/10.1007/s00170-016-9727-5