胚料在螺帽成型機成型的過程中，會因高壓而黏貼於公模內，致使後通出機構無法將其頂出。因此，必須利用前通出機構來控制公模內的頂出桿，強迫胚料停留在母模內，以利後通出機構頂出胚料。習用的螺帽成型機，在生產厚度不同的螺帽時，需要更換不同的凸輪，頗不方便。近年來，業界的需求為把前通出機構之行程由原本的固定式改成可調整行程，以生產各種厚度的螺帽。
本文的主要目的，是針對螺帽成型機可調整行程之前通出機構，利用一套系統化的流程，進行構造合成與尺度合成，以設計出可任意調整行程之前通出機構。文中，首先分析現有螺帽成型機可調整行程之前通出機構的構造與運動特性，進而歸納出可調整行程之前通出機構的設計需求與設計限制。接著，根據此機構的構造需求，利用型態表分析法，合成數個可行的可調整行程之前通出機構，再以決策矩陣的方式，評估出四個新型機構構想。最後，根據原機構之同步頂出行程與最大頂出量等規格需求，將評比所得的新機構構想進行尺度合成，其中兩型新機構能完全符合可調整同步頂出行程之功能需求。
本文所設計的新型前通出機構的優點，在於前通出機構的同步頂出行程為可任意調整。另外，本文針對此類螺帽成型機可調整行程之前通出機構，所提出的設計步驟，可應用於其他相關機構之構造合成與尺度合成。

In the nut forming process, workpieces may stick to male dies because of high pressure forming. As a result, the knock-out mechanisms attached to female dies fail to knock out workpieces. Hence, ejector mechanisms attached to male dies are required to restrict workpieces to stay in female dies for being knocked out. Moreover, it is inconvenient to change the cam components when forming nuts with different thickness by a traditional nut forming machine. Thus, the nut forming industry is nowadays seeking for adjustable ejector mechanisms to produce nuts with various thickness.
The main purpose of this study is to design new adjustable ejector mechanisms of a nut former by using a systematic method for the structural synthesis and dimensional synthesis of the mechanisms. First, the design requirements and constraints are concluded from the results of structural analysis and kinematic analysis of existing adjustable ejector mechanisms of nut formers. According to the structural requirements for an adjustable ejector mechanism, some feasible adjustable ejector mechanisms are synthesized via the morphological chart analysis method. By using the method of decision matrix, four better designs are then selected for the dimensional synthesis of new adjustable ejector mechanisms. Based on the functional requirements of an existing ejector mechanism, the dimensions of the four designs are synthesized. Two of them are shown to fulfill the functional requirements for an adjustable ejector mechanism.
The main advantage of the new designs is that the synchronous ejection stroke of the synthesized mechanisms can be adjusted for forming nuts with different thickness. The design procedures used in this study can also be provided for the structural synthesis and dimensional synthesis of other adjustable ejector mechanisms of nut formers and relative mechanisms.

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