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系統識別號 U0026-0602201800394700
論文名稱(中文) 螺絲成型機可調整行程後通出連桿機構之運動合成
論文名稱(英文) Kinematic Synthesis of an Adjustable Knock-Out Linkage Mechanism of Screw Former
校院名稱 成功大學
系所名稱(中) 機械工程學系
系所名稱(英) Department of Mechanical Engineering
學年度 106
學期 1
出版年 106
研究生(中文) 吳苡誠
研究生(英文) Yi-Cheng Wu
學號 N16054603
學位類別 碩士
語文別 中文
論文頁數 95頁
口試委員 指導教授-黃文敏
指導教授-顏鴻森
口試委員-陳家豪
中文關鍵字 螺絲成型機  後通出連桿機構  暫停機構  可調整行程機構  運動合成  構造合成  尺度合成 
英文關鍵字 Screw former  Knock-out linkage mechanism  Dwell mechanism  Adjustable mechanism  Kinematic synthesis  Structural synthesis  Dimensional synthesis 
學科別分類
中文摘要 螺絲成型機是一種以鍛造製程製造螺絲的機械設備,其後通出機構的主要功能為將鍛造成型後的半成品從母模穴通出。另外,為了在同一台螺絲成型機生產不同長度的螺絲,後通出機構亦須具備可調整通出行程的功能。為了配合螺絲成型機其他機構的作動以及調整通出行程,後通出機構必須為暫停機構,其輸出桿運動時序具有暫停區間。後通出機構通常使用凸輪機構進行時序的控制,然而凸輪機構具有易磨耗、製造與維護成本較高等缺點。為解決上述問題,本文以連桿機構取代凸輪機構,重新設計具有相同功能的可調整行程後通出機構。
本文首先彙整後通出機構的專利與連桿組式暫停機構的相關文獻,並分析一型以凸輪驅動的可調整行程後通出機構,據以歸納出可調整行程後通出機構的設計需求與限制。螺絲成型機可調整行程後通出機構依其兩項功能需求,可區分為暫停機構與調整機構兩個子機構。關於暫停機構的構造合成,本文利用創意性機構設計方法合成出五種可行的六連桿機構,並利用決策矩陣法選定Watt-II型六連桿機構作為後續設計的構造。至於其尺度合成,本文提出一個設計概念,將輸出桿極限位置從通出行程起點後退,以取代通出行程之前的暫停運動,可使原暫停機構的運動需求,從兩段近似暫停區間減為僅需一段近似暫停區間。針對此段近似暫停區間需求,本文提出一個設計理念,使Watt-II型機構的兩個串聯四連桿組極限位置重合,並對應於通出行程的終點,藉以產生較長的近似暫停區間。根據上述平面四連桿機構極限位置的幾何特性,配合相對極心法,本文建立一套Watt-II型暫停機構的幾何設計方法,以通出行程期間暫停機構輸出桿的擺幅誤差最小化為目標,利用最佳化方法進行尺度合成,合成Watt-II型暫停機構的尺度。關於調整機構的尺度合成,本文利用在最長與最短通出行程時,調整機構起訖位置的幾何關係,建立倒置型滑件曲柄機構的幾何設計方法,再以調整機構輸入桿的擺幅最小化,以及通出行程起點位置輸出桿的最短有效力臂最大化為目標,進行最佳化設計,合成調整機構的尺度。最後,將設計結果與現有設計的各項性能進行比較,本文所合成的Watt-II型暫停機構在通出行程起點時的傳力角正弦值增加10.2%,輸出桿的有效力臂增長93.5%;調整機構在通出行程起點位置的最小傳力角正弦值增加37.5%,輸出桿的最短有效力臂增長32.4%。
本文所提出的可調整行程後通出連桿機構不具凸輪、滾子從動件與彈簧,因此可以降低製造與維護成本。所設計的暫停機構於近似暫停區間的角位移誤差僅有0.004度,可視為具有良好的暫停效果,讓操作人員調整通出行程時易於定位。此外,所設計的暫停機構與調整機構,相較於現有的後通出機構,由於具有較佳的傳力效果與有效力臂,可降低後通出機構輸入扭矩的峰值,具有較佳的機械性能。
英文摘要 A screw former is a kind of machine for manufacturing screws by forging processes. The major function of the knock-out mechanism of a screw former is to knock out the semi-finished product from a female die. Besides, in order to manufacture screws with different length, the knock-out mechanism should be adjustable for variable knock-out strokes. For coordinating with other mechanisms in a screw former and adjusting the knock-out stroke, a knock-out mechanism must be a dwell mechanism. Thus, an adjustable knock-out mechanism consists of two sub-mechanisms: a dwell mechanism and a variable-stroke mechanism. The purpose of this thesis is to replace the cam mechanism by a linkage mechanism and redesign the adjustable knock-out mechanism for generating the same functions as an existing design. According to the structural requirements and constraints for an adjustable knock-out mechanism, five feasible six-bar linkages for the dwell mechanism are synthesized by a creative mechanism design methodology. After evaluating with the decision matrix method, the Watt-II mechanism is selected for the dwell mechanism. The dimensions of the Watt-II dwell mechanism is synthesized by an optimization method based on a geometrical design method, which is constructed on the basis of the limit position of planar four-bar linkage and relative pole method. The dimensions of the variable-stroke mechanism is also synthesized by an optimization method based on a geometrical design method, which is constructed on the basis of the initial and final positions of the variable-stroke mechanism with the longest and the shortest knock-out strokes. The new adjustable knock-out linkage mechanism for a screw former proposed in this thesis improves the mechanical performances of an existing cam-driven knock-out mechanism.
論文目次 摘要 (I)
Abstract (III)
致謝 (IX)
表目錄 (XII)
圖目錄 (XIII)
第一章 緒論 (1)
1-1 研究動機 (1)
1-2 文獻回顧 (3)
1-2-1 後通出機構專利回顧 (3)
1-2-2 連桿組式暫停機構研究文獻 (19)
1-3 研究目的與方法 (25)
1-4 論文組織架構 (27)
第二章 可調整行程後通出機構的構造合成 (30)
2-1 現有後通出機構的構造分析 (30)
2-2 暫停機構構造合成的設計需求與限制 (32)
2-3 暫停機構的構造合成 (33)
2-3-1 現有設計 (34)
2-3-2 一般化與一般化鏈圖譜 (34)
2-3-3 特殊化 (35)
2-3-4 具體化 (36)
2-4 暫停機構的構造評估 (36)
2-5 小結 (38)
第三章 調整機構的尺度合成 (41)
3-1 現有調整機構的運動分析 (41)
3-2 調整機構尺度合成的設計需求與限制 (45)
3-3 應用幾何法於調整機構的尺度合成 (46)
3-4 應用最佳化方法於調整機構的尺度合成 (50)
3-4-1 幾何法的數學方程式 (50)
3-4-2 調整機構的尺度最佳化 (54)
3-5 與現有設計的比較 (56)
3-6 小結 (58)
第四章 Watt-II型暫停機構的尺度合成 (60)
4-1 現有暫停機構的運動分析 (60)
4-2 Watt-II型暫停機構尺度合成的設計需求與限制 (61)
4-3 應用幾何法於暫停機構的尺度合成 (64)
4-4 應用最佳化方法於Watt-II型暫停機構的尺度合成(66)
4-4-1 幾何法的數學方程式 (66)
4-4-2 Watt-II型暫停機構的尺度最佳化 (69)
4-5 Watt-II型暫停機構的運動分析 (73)
4-6 小結 (79)
第五章 結論與建議 (82)
參考文獻 (85)
附錄 應用幾何法於Watt-II型雙暫停機構的尺度合成 (91)
著作權聲明 (95)
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