本文主要探討高壓氣冷與超音波潤條件下銑削SKD11(HRc60)以及SKD61(HRc40)模具鋼，觀察不同潤滑條件對加工後工件表面粗糙度與刀具磨耗的影響，並分析切削力與比切削係數的差異。實驗結果再與乾切削實驗作詳細的結果比較。
在SKD11的實驗結果中，當徑向切深小，超音波潤滑的條件下，工件表面粗糙度及刀具磨耗的結果為最佳，其次為高壓氣冷，最差的是乾切削；隨著徑向切深加大，超音波潤滑及高壓氣冷可以有效地降低刀腹與工件之間的犁切效應，增加刀具壽命。SKD61的實驗中，同樣發現超音波潤滑與高壓氣冷可以降低刀腹與工件間的犁切力量。
比切削係數的分析結果發現，高壓空氣冷卻與超音波潤滑皆能有效降低刀具犁切效應，尤其以超音波潤滑的效果最為明顯；而此兩種潤滑方式都能進一步改善刀具壽命，提升加工表面品質。
SKD11(HRc60)實驗中，透過切屑顏色與溫度的關係來看，乾切削實驗的溫度最高，高壓氣冷次之，超音波潤滑對於降低切削溫度的效果最明顯。

This thesis discussed surface roughness and tool wear in milling tool steel material with different cutting fluid supply conditions. SKD11(HRc60) and SKD61(HRc40) were milled on the condition of high pressure air cooling and ultrasonic lubrication. The milling force was analyzed to
identify both the cutting coefficients of shearing and plowing effects individually.
The experiment results showed that less tool wear and better roughness of milling surface can be found on the condition of ultrasonic lubrication and less radial cutting depth. Even on the condition of higher radial cutting depth, the influences of the ultrasonic lubrication to the milling performance were superior to that of the high pressure air cooling.According to the cutting coefficients identified from the milling force, the plowing coefficient in tangential direction mostly reduced while supplying the ultrasonic lubricant. Moreover, the ultrasonic lubrication can suppress the rapid growth of milling temperature more efficiently than the high pressure air cooling when cutting load was increased in milling the high hardness tool steel.

1.Martellotti M. E., “An Analysis of the Milling Process, “Transaction of ASME, Vol. 63, pp.677-700, 1941.
2.Martellotti M. E., “An Analysis of the Milling Process, Part 2: Down Milling, “Transaction of ASME, Vol. 67, pp. 233-251, 1945.
3.Koenigsberger, F. and Sabberwal, A. J. P., “An Investigation into the Cutting Force Pulsations During Milling Operations, “International Journal of Machine Tool Design and Research, Vol. 1, pp. 15-33,1961.
4.Sabberwal, A. J. P., “Chip Section and Cuting Force During the Milling Operation, “Annals of the CIRP, Vol. 10, pp. 197-203 , 1961.
5.Tlusty, J., and MacNeil, P., “Dynamics of Cutting Forces in End Milling, “CIRP annals, Vol. 24, pp. 21-25, 1975.
6.Melkote S. N. and Endres W. J., “The Importance of Including Size Effect When Modeling Slot Milling, “ ASME Journal of Manufacturing Science and Engineering, Vlo. 120, pp. 69-75, 1998.
7.Eneres W. J., DeVor R.E. and Kapoor S. G., “A Dual-Mechanism Approach to the Prediction of Machining Forces,” ASME Journal of Engineering for Industry, Vol. 117, pp. 526-541, 1995.
8.Geoffrey Boothroyd, “Fundamentals of Metal Machining and Machine Tools, 2nd printing,” CENTRAL BOOK COMPANY at Taipei, Taiwan, pp. 71.
9.Budak E., Altintas Y. and Armarego E. J. A., “Prediction of Milling Force Coefficients From Orthogonal cutting Data, “ ASME Journal of Manufacturing Science and Engineering, Vol. 118, pp. 216-224, 1998.
10.Yellowley, I., “Observations on the Mean Values of Forces, Torque and Specific Power in the Peripheral Milling Process,” International Journal of Machine Tool Design and Research, Vol. 25, No. 4, pp. 337-346, 1985.
11.Kline, W. A., DeVor, R.E., Snareef, I. A., “The Prediction of Cutting Forces in End Milling with Application to Cornering Cuts, “ International Journal of Machine Tool Design and Research, Vol. 22, No. 1, pp. 7-22, 1982.
12.Wang J. J., “Convolution Modeling of Milling Force System and Its Application to Cutter Runout Identification, “ph.D. thesis, School of Mechanical Engineering, Georgia Institute of Technology, April, 1992.
13.Wang J. J. and Liang S. Y. and Book W. J., “Convolution Analysis of Milling Force Pulsation, “ASME Journal of Engineering for Industry, Vol. 116, pp. 17-25, 1994.
14.Wang J. J., Zheng C. M., “An analytical force model with shearing and ploughing mechanisms for end milling,” International Journal of Machine Tools & Manufacture, Vol.42, pp.761-771, 2002.
15.張煌權，包含側邊及底面犁切力之端銑及面銑力模式，國立成功大學機械研究所，九十年碩士論文.
16.Sutherland, J. W., Kulur, V. N., King, N.C., 2000, “An Experimental Investigation of Air Quality inWet amd Dry Turning”, Annals of the CIRP, 49/1:61-64.
17.Heisel, U., Lutz, M., Spath, D., Wassmer, R., Walter, U., 1994, “Application of Minimum Quantity Cooling Lubrication Technology in Cutting Processes”, Production Engineering, Vol.II/1:49-54.
18.Klocke, F., Eisenblatter, G., 1997, “Dry Cutting”, Annals of the CIRP, 46/2:519-526.
19.Wakabayashi, T., Sato H., Inasaki I., 1998, “Turning using Extremely Small Amount of Cutting Fluids”, JSME International Journal(Series C), 41/1, 143-148.
20.Wakabayashi, T., Inasaki I., Suda, S., Yokota H., 2003, “Tribological Characteristic and Performance of Lubricant Esters for semi-dry Machining”, Annals of the CIRP, 52/1:61-64.
21.Weinert, K., Inasaki, I., Sutherland, J. W., Wakabayashi, T., 2004, “Dry Machining and Minimum Quantity Lubrication”, Keynote Paper, Annals of the CIRP, 53/2:511-537.
22.Klocke, F., Eisenblaetter, G., 1997, “Machinability Investigation of the Drilling Process Using Minimum Cooling Lubrication Techniques”, Production Engineering, Vol.IV/1:19-24.
23.Aoyama, T., 2002, “Development of a Mixture Supply System for Machining with Minimal Quantity Lubrication”, Annals of the CIRP. 51/1:289-292.
24.Kiyoshi Suzuki, Hu Bin Qun, Sholi Mishiro, Katsutoshi Tanaka, Tomoyasu Imai, Anurag Sharma, Tetsutaro Uematsu, Manabu Iwai, 2003, “Grinding Performance Improvement by a Special Coolant Superimposed with the Megasonic Vibration”, Key Engineering Materials Vols. 238-239 pp.183-188.
25.Oishi, K., “Built-up Edge Elimination in Mirror Cutting of Hardened
Steel,” J. of Engineering for Industry, Vol.117, pp.62-66, February, 1995.
26.Elbestawi, M. A., Chen, L., Becze, C. E. and El-Wardany, T. I., “
High-Speed Milling of Die and Molds in Their Hardened State,”
Annals of the CIRP, Vol.46, pp.57-62, 1997.
27.Ng, E-G. and Aspinwall, D. K., “The Effect of Workpiece Hardness
and Cutting Speed on the Machinability of AISI H13 Hot Work Die Steel When Using PCBN Tooling,” ASME Journal of Manufacturing Science and Engineering, Vol.124, pp.588-594, 2002.
28.鄭茗元，SKD61硬化模具鋼銑削特性之探討，國立成功大學機械工程研究所碩士論文，九十一年。
29.Ning, Yuan, Rahman, M. and wong, YS., “Investigation of chip formation in high speed end milling,” Journal of Material Processing Technology, Vol.113, pp.360-367, 2001.