吹瓶機雙凸輪設計之研究

Study on the Design of Dual-Cams of Blow-Molding Machines

張嘉浤(Jia-Hong Zhang)

指導教授 ： 劉俊佑

國立虎尾科技大學/工程學院/機械與機電工程研究所/碩士(2008年)

https://doi.org/10.6827/NFU.2008.00005

摘要

本文乃針對蔡[1]所設計之PET吹瓶機傳送雙凸輪，同時參考洪[2]所做之運動分析，進行系統化的改良設計研究，並發展視窗設計程式，以快速的設計出不同的PET瓶傳送雙凸輪。蔡所設計之雙凸輪，仍有幾項問題需要改良：1. 入胚雙凸輪抓胚時，槽凸輪與平板凸輪之壓力角有過大情形；2. 入胚雙凸輪抓胚時，夾爪位置不準確；3. 入胚雙凸輪後循跡時，夾爪在退出模座時，方位不準確；4.出瓶雙凸輪在伸入模座取瓶時，方位不準確。
本文先對PET吹瓶機輸送裝置的夾爪運動路徑，依據幾何關係訂定設計需求與限制條件，分別對循跡路徑、對正路徑、以及連接路徑進行路徑之合成設計。再由連桿機構的向量關係將夾爪中心運動路徑分解為雙凸輪中的槽凸輪與平板凸輪之運動位移曲線，利用座標轉換原理與包絡原理，推導出輸送雙凸輪之輪廓外形。用向量?路法探討改良設計後之夾爪運動特性及雙凸輪的壓力角，並與原設計做比較。本文用SolidWorks軟體對輸送雙凸輪輪廓外形做實體模型，並進行PET吹瓶機輸送動作之運動模擬，驗証設計之結果。
本文以Visual Basic軟體發展一套視窗化PET吹瓶機輸送雙凸輪設計程式，提供設計者可以快速進行改良設計傳送雙凸輪機構的能力，並同時可分析夾爪中心路徑之速度、加速度與壓力角，做為判斷是否符合設計要求之依據。可提昇合作廠商快速進行改良設計傳送雙凸輪機構的能力與增加競爭力，亦可提供相關業界做為研究設計雙凸輪的參考依據。

關鍵字

吹瓶機,雙凸輪,循跡,對正,外形設計

並列摘要

This research is aimed at the dual-cams of a PET blow-molding machine which is designed by Tsai[1] together with the kinematic analyzation which studied by Hong[2] in order to modify design the transfer dual-cam systematically. And also develop a window-based program for designing the transfer dual-cams of PET blow-molding machines rapidly. According to the design of Tsai, there are several problems that need to be modified: 1. In the grabbing action of infeed preform dual-cam, the pressure angle is high in slot-cam and plate-cam. 2. In the grabbing action, the position of infeed preform gripper is not alignment. 3. In the after tracing path of infeed preform dual-cams, the position of gripper is not alignment. 4. In the before tracing path of outlet bottle dual-cam, the position of gripper is not alignment.
Based on the geometry relationship, this research defines the design requirements and constraint conditions for the gripper path of dual-cams of transfer devices of PET blow-molding machine. Then the tracing, alignment, and connect path of the gripper path of dual-cams are synthesized. The gripper path is decomposed into the displacement curve of slot-cam and plate-cam individually on the basis of vectors relation between the links of link-mechanism. Based on the Theory of Envelope and Coordinate Transformation, the equations of geometry profiles of dual-cams of blow-molding machine are derived. In this research, the vector loop method and the definition of pressure angle are applied to analyze the motion characteristics and pressure angle of these cams. By using the computer motion stimulation software SolidWorks, the solid modeling of the dual-cams are established and the transfer motion of the transfer devices are simulated in order to verify the design results.
Furthermore, this research is developed a window-base design program for transfer dual-cams of PET blow-molding machine by using Visual Basic software. This program can enhance the design abilities of users and can modify design the transfer dual-cams rapidly. It also can analyze velocity, acceleration of gripper and pressure angle of dual-cams in order to verify the design. The results of this research can enhance the design and competitive abilities of the cooperated factory. It can also be the important reference for the design of dual-cams of the related industries.

並列關鍵字

blow-molding machines, dual-cams, tracing, alignment, profile design

參考文獻

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