Cutting Process of Double Angle Drill

Abstract:

Double angle drills have recently been used to improve the surface finish in drilling. The double angle drill consists of lower edges at a large wedge angle and upper edges at a small wedge angle on the lips. The paper discusses the cutting processes of the double angle drill in analysis and experiment. A force model is applied to simulate the cutting force and the chip flow direction. The cutting tests are conducted to verify the force model in drilling of carbon fiber reinforced plastic (CFRP) and aluminum alloy (A7075) with a single and a double angle drills. The double angle drill is effective in control of delamination in drilling of CFRP due to reduction of the thrust force. Meanwhile, in drilling of A7075, the small wedge angle of the upper edges on the double angle drill is not effective in reduction of the thrust forces. The curved edge at the end of the lip, in turn, promotes burr formation in drilling of A7075. The effectiveness of the double angle drill depends on the workpiece material.

• Periodical: Key Engineering Materials (Volumes 651-653)
• Pages: 1211-1216
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.651-653.1211
• Online since: July 2015
• Authors: Shouichi Tamura*, Takashi Matsumura
• Keywords: Aluminium Alloy, CFRP, Cutting Force, Drilling, Simulation, Surface Finish

References

[1] E.J., Armarego, C.Y., Cheng, Drilling with rake face and conventional twist drills. 1: Theoretical investigation, International Journal of Machine Tool Design Researches, 12 (1972) 17.

DOI: 10.1016/0020-7357(72)90009-1

[2] M. Elhachimi, S., Torbaty, P., Joyot, Mechanical modelling of high speed drilling. 1: Predicting torque and thrust, International Journal of Machine Tool Design Researches, 39 (1999) 553-568.

DOI: 10.1016/s0890-6955(98)00050-9

[3] E. Usui, A., Hirota, M., Masuko, Analytical prediction of three dimensional cutting process ─Part1 Basic cutting model and energy approach, ASME Journal of Engineering for Industry, 100 (1978) 222-228.

DOI: 10.1115/1.3439413

[4] T. Matsumura, E., Usui, Predictive cutting force model in complex-shaped end milling based on minimum cutting energy, International Journal of Machine Tools and Manufacture, 50, 5 (2010) 458-466.

DOI: 10.1016/j.ijmachtools.2010.01.008

[5] T., Matsumura, I., Hori, T., Shirakashi, E., Usui, Simulation of drilling process based on energy approach, Proceedings of the 8th International ESAFORM Conference on Material Forming, 2 (2005) 757-760.

[6] T. Matsumura, J., Leopold, Simulation of drilling process for control of burr formation, Journal of Advanced Mechanical Design, Systems, and Manufacturing, 4, 5 (2010) 966-975.

DOI: 10.1299/jamdsm.4.966