伺服沖床是近幾年來因應精密製造與高科技電子產品自動化生產需要而產生的設備，採用數位伺服控制，可從事多樣化的沖、鍛、壓製程。本研究針對滾珠螺桿機構，利用變轉速輸入的概念，找出符合各類型沖壓加工之運動需求的轉速函數，將變轉速滾珠螺桿機構應用於伺服沖床。首先針對伺服沖床與滾珠螺桿做一介紹。接著推導滾珠螺桿機構之輸入與輸出桿件的運動特性方程式，作為運動分析之基礎。然後以最小化輸出桿件之加速度峰值為目標函數，分別針對一般化運動需求以及伺服沖床於深引伸與精密剪切加工的應用，設計出滿足所需運動特性之輸入轉速函數。最後並實作出一伺服滾珠螺桿機構的原型機測試系統，透過實驗方式驗證了本研究之可行性。由結果得知，本研究所使用的轉速函數設計方法，亦可用於輸入桿件必須正逆轉使用的滾珠螺桿機構。而變轉速滾珠螺桿機構之多樣化的輸出運動特性，確實能夠滿足伺服沖床高速下降、等速加工、以及下死點停留時間延長等特性。

This work targets on the application of variable-speed ball-screw-mechanisms on the servo press. Servo presses are manufacturing equipments resulted from the need of recent precision manufacturing and the current automatic manufacturing for high-tech electronic products. The slider of the servo press can perform various processes by digital servo control. Here we apply the concept of variable-input-speed for finding the suitable kinematic functions of various sheet-metal forming processes for servo presses that are driven by ball-screw-mechanisms. The introduction of servo presses and ball-screw-mechanisms is presented first. Then, the kinematic relationship between the input link and the output link of the ball-screw-mechanisms is derived. And, the minimum acceleration of the slider is selected as the objective function for designing the desired input speed trajectories that satisfy specific kinematic specifications. Finally, a prototype of this “Servo-Ball-Screw-Mechanism” is built and tested. According to the results, the derived input speed trajectories also can be used in ball-screw-mechanisms such that the direction of the input link can be reversed. And, the various characteristics of the output motion of ball-screw-mechanisms can achieve high speed dropping, uniform processing, and extending the retention period of the low dead center of servo presses.

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