PET吹瓶機傳送裝置之凸輪設計

On the Design of the Cams of Transfer Device for a PET Blow-Molding Machine

蔡政達(Zheng-Dar Tsai)

國立虎尾科技大學/工程學院/動力機械工程研究所/碩士(2006年)

摘要

旋轉式PET吹瓶機是由旋轉式吹瓶模座搭配入胚與出瓶輸送装置組成。而入胚與出瓶輸送裝置是由平板凸輪、槽凸輪以及連桿機構組合而成。本研究之主要目的乃針對吹瓶機的入胚與出瓶傳送裝置的凸輪進行系統化設計研究。首先分析現有吹瓶機入胚與出瓶夾爪中心的運動曲線特性、訂定設計需求與限制條件，對工件的運動曲線進行合成後，再分別分解為入胚和出瓶凸輪的槽凸輪與平板凸輪之運動曲線。利用包絡原理、座標轉換以及微分幾何原理，推導出旋轉式吹瓶機入瓶與出瓶凸輪之輪廓外形。依向量廻路法與壓力角定義探討凸輪的運動特性及壓力角。本研究以Solid Works軟體，對入胚與出瓶凸輪輪廓外形做實體模型以及進行運動模擬。製造組裝入胚與出瓶輸送凸輪之雛形以驗証設計之結果。本研究建立一套旋轉式PET入胚及出胚凸輪的設計與分析方法，並發展運動分析與模擬程式。本研究之成果對於吹瓶機入胚及出胚凸輪之設計，有莫大的助益，可為設計旋轉式吹瓶機之重要參考依據，亦可提升相關業者的國際競爭能力。

並列摘要

The rotary type PET blow-molding machine consists the rotary blow-station device, infeed and outlet transfer device. The infeed or outlet transfer device is composed of plate-cam, slot-cam, and linkage mechanism. The purpose of this research is aimed at the research of systematic design method for the cams of infeed or outlet transfer device of rotary type blow-molding machine. Firstly, the motion characteristics are analyzed, the design requirements and constraint conditions are defined, and the motion curve of the clapping arm center of infeed and outlet transfer device is synthesized. Then, the motion curve is decomposed into the motion curve of slot-cam and plate-cam, individually. Based on the Theory of Envelope, Coordinate Transformation, and theory of Differential Geometry, the equations of geometry profiles of cams of infeed and outlet transfer device of rotary blow-molding machine are derived. The vector loop method and the definition of pressure angle are used to analyze the motion characteristics and pressure angle of these cams. By using the Solid Works software, the motion simulation and solid molding of the infeed and outlet cam is established to verify the theoretical derivation, and the prototype of these cams are machined and assembled. This research establishs a systematic procedure of design and analysis of infeed and outlet cams. And a computer program for motion analysis and simulation of the cams is developed. The result of this research is great helpful to the design of the cam of infeed and outlet transfer device of rotary type blow-molding machine. The results in this study are the important reference basis for designing rotary type blow-moulding machine. The achievement of this research can enhance the industry’s design and analysis abilities and improve its international competition.

參考文獻

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