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  • 學位論文

高速封切機之凸輪曲線改良

The Improvement of Cam Curve for High Speed Sealing and Cutting Machines

指導教授 : 黃以文
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摘要


封切機當轉速由250rpm提高至450rpm時,其切刀的加速度值會急劇增高,影響封切的效果。本論文之目的,主要在於改良凸輪的運動曲線,有效降低切刀的加速度峰值。 首先,本文訂定450rpm時切刀運動的邊界條件,並以四段五階多項式曲線合成出滿足條件的凸輪運動曲線,當做原始曲線。其次,利用最佳方法,將加速度曲線的三個峰值當做目標,設定各種組合的權重,組成多目標函數,再以變量轉換法配合隨機猜測起始值等最佳化技術,找出最佳化的五階多項式運動曲線。最後,本文根據最佳化五階多項式曲線的線型,提出一個新型的梯形加速度曲線,並將加速度曲線的峰值再一次的降低。 相對於原始曲線,最佳化五階多項式曲線的加速度峰值降低了16.4%,而新型梯形曲線的加速度峰值降低了27.9%,證明本文所提出的方法是可行且有效。

關鍵字

梯形 最佳化 凸輪

並列摘要


When the speed upgrade to 250rpm to 450rpm, the cutting acceleration of the sealing and cutting machine will get higher in a very short time, and influence the result. So, the purpose of this paper is mainly about improving the motion curve of cam. First, setting up the boundary conditions of 450rpm cutting motion, then, using five-order polynomial curves of four steps to satisfy the cam motion curve. Secondly, by using the Optimization method, taking the three peaks of acceleration curve as target, setting the weight of each combination to combine the multiple objective function, and then using variable transformation method to guess the value randomly to find the best five-order motion curves. Finally, according to the best five-order polynomial motion curves to give a new trapezoidal acceleration curve and reducing the peak value of acceleration curve. With respect to original curve, the best five-order polynomial motion curve is reducing 16.4% of acceleration peak value, and the new trapezoidal acceleration curve reducing 27.9%,so it proves that the methods of this paper is workable.

並列關鍵字

Trapezoidal Optimization Cam

參考文獻


8.郭羿承,2007,”四次多項式七段曲線構成之凸輪曲線探討”,國立台北科技大學車輛工程系,碩士論文。
1.林新凱,2012,”高速封切機之分析與改良”,國立中正大學工學院機械工程學系,碩士論文。
9.Berzak, N.,1982.“Optimization of Cam-Follower Systems With Kinematic and Dynamic Constraints”, Journal of Mechanical Design, Vol.104,29.
12.劉俊宏,2009,”搖擺式凹面從動件之盤型凸輪機構的設計”,國立清華大學動力機械工程系,碩士論文。
2.羅茂年,1999,峰切刀往負傳動之改良結構,中華民國專利申請案號 088211305。

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