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帶鋸床機切削力模型

帶鋸床機切削力模型. 班級 : 自控四甲 組員 :49812030 陳勝煒 49812097 高廉傑 指導老師 : 沈毓泰. 介紹. 鋸床為原料加工的機械，並構成機械工廠最重要的機床工具。 帶鋸機被廣泛使用，原因如下：具有切割效率高、切割的切縫小、進給速率可以變化、可處理大尺寸公件。. 前言. 帶鋸床銑削過程是相似的，因為它涉及多點切割，以評估具體的切割壓力，所以不是一件容易的事。 例如 : 在一定的切削速率下，隨著切口的負 荷增加，會引起負荷變動的震動，震動影響切割的切縫，並影響到切割尺寸的表面粗糙度及耐受性. 板料厚度.

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帶鋸床機切削力模型

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  1. 帶鋸床機切削力模型 班級:自控四甲 組員:49812030陳勝煒 49812097高廉傑 指導老師:沈毓泰

  2. 介紹 • 鋸床為原料加工的機械，並構成機械工廠最重要的機床工具。 • 帶鋸機被廣泛使用，原因如下：具有切割效率高、切割的切縫小、進給速率可以變化、可處理大尺寸公件。

  3. 前言 • 帶鋸床銑削過程是相似的，因為它涉及多點切割，以評估具體的切割壓力，所以不是一件容易的事。 例如:在一定的切削速率下，隨著切口的負 荷增加，會引起負荷變動的震動，震動影響切割的切縫，並影響到切割尺寸的表面粗糙度及耐受性

  4. 板料厚度 • 帶鋸床中，每齒進給的切削深度是相等的，因為它們都在相同的方向上測量。 • 取決於進給速度和切削速度，並且可以由下面的表達式確定。其中ti是切削深度，p為連續的齒之間的距離，f是在進給速率，並且n是切削速度。

  5. 具體切削壓力 • 如圖被定義為X方向的力，也就是正常的齒面的法向切削力。沿Z方向是徑向的工具面，並朝向下方。Y方向，工具面外側 。 • 具體的的切割壓力和特定的切削係數，如下所示： 其中Fx, Fy和Fz的每個牙的X，Y，Z方向分別平均切削力。

  6. 切割實驗 • 如圖示臥式帶鋸機在實驗中，測量三向切削力，一個工具測力計被安裝在鋸上，夾持工件在測功機上跑。從刀具測力計的切削力信號由電荷放大器放大，通過A / D轉換由計算機計算。 實驗設置。Saw blade=鋸片 Workpiece=工件 Fixture=夾具 Charge amp=電荷放大器 A / D converter= A/ D轉換​​器

  7. 具體切削壓力建模 • 為了預測切割力，模型建立具體切割壓力。 • 模擬一個特定的切割壓力，以下方程式,表示特定的切割壓力和未變形的芯片面積，其中a和b是常數，A是未變形的芯片面積之間的關係。

  8. 多點切削模型 • 在多點切割，切削力模型是好的，但為了更精確地預測切削力，齒與齒產生的跳動和頻帶的振動也應被考慮。 • 多點切割，可以預測乘以總嚙合的齒數由單點切削的切削力。

  9. 結論 • 機械模型可以預測切削力 • 切削力模型是建立在特定的切割壓力。 • 進一步的工作應該考慮非均勻的牙齒形狀，橫向振動的鋸片，驅動輪的和不完善的平衡，更精確的預測切削力。

  10. 參考文獻 • [1] P.F. Ostwald, J. Munoz, Manufacturing processes and systems, John Wiley and Sons, Inc., 1997. • [2] A.G. Ulsoy, C.D. Morte, Vibration of wide band saw blades, ASME Journal of Engineering for Industry 104 • (1982) 71–78. • [3] J.F. Carlin, F.C. Appl, H.C. Bridwell, R.P. Dubois, Effects of tensioning on buckling and vibration of circular • saw blades, ASME Journal of Engineering for Industry February (1975) 37–48. • [4] H. Chandrasekaran, S. Svensson, M. Nissle, Tooth chipping during power hack sawing and the role of saw material • characteristics, Annals of the CIRP 36 (1) (1987) 27–31. • [5] H. Chandrasekaran, H. Thoors, H. Hellbergh, L. Johansson, Tooth chipping during band sawing of steel, Annals • of the CIRP 41 (1) (1992) 107–111. • [6] M. Sarwar, D. Gillibrand, S.R. Bradbury, Forces, surface finish and friction characteristics in surface engineered • single- and multi-point cutting edges, Surface and Coating Technology 49 (1991) 443–450. • [7] W.M.M. Hales, M. Sarwar, Geometrical parameters affecting hacksaw blade performance, Ninth International • Conference on Production Engineering Research, Cincinatti, 1987, pp. 1802–1810. • [8] M. Sawar, S.R. Bradbury, M. Dinsdale, An approach to computer aided band saw teeth testing and design, Proceedings • of the Fourth National Conference on Production Research, 1988, pp. 494–501. • [9] W.E. Henderer, J.D. Boor, J.R. Holston, Estimation of cutting forces in band sawing metals, Transactions of • NAMRC 24 (1996) 33–38. • [10] M.E. Martellotti, An analysis of the milling process, Transactions of ASME 63 (1941) 667. • [11] M.E. Martellotti, An analysis of the milling process. Part II: Down milling, Transaction of ASME 67 (1945) 233. • [12] F. Koenigsberger, A.J.P. Sabberwal, An investigation into the cutting force pulsation during milling operation, • International Journal of Machine Tool Design and Research 1 (1961) 15. • [13] J. Tlusty, P. MacNeil, Dynamics of cutting forces in end-milling, Annals of CIRP 24 (1) (1975) 21–25. • [14] W.A. Kline, R.E. DeVor, J.R. Lindberger, The prediction of cutting forces in end milling with application to • cornering cut, International Journal of Machine Tool Design and Research 22 (1) (1982) 7–22. • [15] B.K. Fussell, K. Srinivasan, An investigation of the end-milling process under varying machining conditions, • ASME Journal of Engineering for Industry 111 (1989) 27–36. • [16] H.J. Fu, R.E. DeVor, S.G. Kapoor, A mechanistic model for the prediction of the force system in face milling • operation, ASME Journal of Engineering for Industry 106 (1984) 81–88. • [17] E.J.A. Armarego, N.P. Deshpande, Computerized predictive cutting models for forces in end-milling including • eccentricity effects, Annals of CIRP 38 (1) (1989) 45–49. • [18] H.Y. Feng, C.H. Menq, The prediction of cutting forces in the ball-end milling processes. Part 1: Model formation • and model building procedure, International Journal of Machine Tools Manufacture 34 (5) (1994) 697–710. • [19] H.Y. Feng, C.H. Menq, The prediction of cutting forces in the ball-end milling processes. Part 2: Cut geometry • analysis and model verification, International Journal of Machine Tools Manufacture 34 (5) (1994) 711–720

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