二段旋轉式寶特瓶吹瓶機的吹瓶模座機構是由吹瓶輪以及開關模座連桿與凸輪機構所組成，其動力特性影響寶特瓶製程的穩定性。本研究利用運動曲線設計及連桿尺寸設計，針對開關模座連桿與凸輪機構進行動力特性分析。
本研究首先利用傅利葉級數與B-spline曲線，設計新型運動曲線，接著透過向量迴路法配合運動係數法分析各個桿件之運動特性。根據運動分析的結果，利用包絡線原理與壓力角定義，求得凸輪輪廓外型與壓力角數值。再根據d’Alembert與牛頓運動定律，建立運動靜動力分析的數學模式，得到輸入扭矩、桿件接頭作用力、搖撼力及搖撼力矩。最後根據分析結果，針對開關模座連桿機構進行尺寸；透過最佳化方法，搖撼力之均方根值改善36.67%，搖撼力矩之均方根值改善48.76%，輸入扭矩之均方根值改善22.95%，輸入力之均方根值改善24.15%，且最大壓力角降低共6.31度至13.65度。
本研究之成果可改善開關模座連桿與凸輪機構之運動與靜動力特性，降低開關模區間所產生的衝擊力，亦降低開關模凸輪機構的壓力角與輸入扭矩，可進一步提升吹瓶機之運轉速度與產量。

The blow-station of a two-stage rotary type blow-molding machine consists of a blow-wheel, a pair of open-close mold linkage mechanism and an open-close mold cam mechanism. The productivity of the machine is dependent on the dynamic characteristics of the blow-mold station. By utilizing motion curve design and optimal dimensional design, the dynamic characteristics can be improved.
In this study, firstly, the motion curves are designed by Fourier series and B-spline curve. Secondly, by using vector loop approach, the kinematic analysis is carried out. According to the kinematic analysis, the cam profile is synthesized based on the envelope theorem, and the pressure angle value is thus obtained. Then based on the d’Alembert’s principle and Newton’s laws, the input torque, the bearing force, the shaking force, and the shaking moment analysis are calculated. Finally, by utilizing the optimal design, a novel dimension design is obtained, and the root-mean-square value of shaking force is 36.67% lower, the root-mean-square value of shaking moment is 48.76% lower, the root-mean-square value of input torque is 22.95% lower and the root-mean-square value of input force is 24.15% lower. Furthermore, the maximum pressure angle is reduced to 13.65 degrees by 6.31 degrees.
In summary, the dynamic characteristics of the blow-mold station are improved. And, the impulse force at the open-close phase, the pressure angle and the input torque are reduced. As a result, the productivity of the machine can thus be improved.

Keywords: rotary type blow-molding machine, cam-linkage mechanism, optimal design, dimension design.

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