[[alternative]]Implementation of Numerical Controlled Sliding Table Sawing Machine

碩士電機工程學系[[abstract]]摘要 台灣木工機械在2003年後因為中國大陸的經濟開放，技術門檻較低的DIY木工機械在中國低價競爭挑戰下，外銷產值及數量由2004年的三百一十七萬九千餘台開始逐年下降至2006年的二百零五萬二千餘台，但是台灣進口的木工機械在2005年至2006年則由九千九百四十八台增加至一萬八千八百零一台。根據經濟部2006年之統計台灣出口之木工機械平均單價為新台幣九千九百九十二元，而進口木工機械平均單價卻達新台幣十七萬七千二百二十四元，探究其主要原因在於台灣木工機械未能將產品轉型為高附加價值的數控設備。[1] 本論文選擇木工機械中用量較大的滑台鋸床為主要的探討目標，針對手動式滑台鋸床改良為數控式時幾項關鍵機械組件及以SM5964C4微處理器進行數位定位系統設計的數控器進行研製，其中包括利用有刷直流馬達推動減速齒輪組及導螺桿進行鋸片轉角與高度位置之驅動機構，利用編碼器或近接開關信號開閉次數之迴授檢測各運動軸的位置尺寸，有刷直流馬達則以脈波調變進行速度控制，透過機械之比例放大機構及有刷直流馬達脈寬調變的速度控制，達成±0.01mm範圍內的軸定位精度規格與完成低價數值控制器之研製。 藉由低成本的NC控制器的核心技術研發, 提升木工機械產品之附加價值及產品精度，進而拉昇木工機械產品之整體價值，延續台灣木工機械產業的生命力及國際競爭力，並增加台灣木工機械的出口產值。 關鍵字：推台型鋸床、微處理器[[abstract]]ABSTRACT Due to the opening-up of China’s economy, Taiwan’s woodworking machinery industry has encountered a severe challenge by China’s low price strategy since 2003. The export volume of Taiwan’s low-technical-threshold DIY woodworking machinery have dropped gradually from 3,179,000 sets in 2004 to 2,052,000 sets in 2006. In the meantime, the import volume have increased from 9,948 sets in 2005 to 18,801sets in 2006. According to the statistics of Taiwan’s Ministry of Economic Affairs, the averaged unit price for the exporting woodworking machinery is NT$ 9,992 in contrast to NT$ 17,724 for the importing ones. Making a thorough inquiry into the problem, we concluded that the results were arose from the deficiency in upgrading the woodworking machinery to higher add-on value NC equipments. In this thesis, we chose the most common woodworking machine, sliding table saw, as our main topic. In the study, we reformed a original manual-operation sliding table saw to automatic controlled one by introducing several new key components in mechanism and developed a new controller which adopted the SM5964C4 as its processor to achieve the numerical positioning control. Following is a brief introduction to the system. A running mechanism consists of the retard gear and ball screw driven by brush DC motors to adjust the saw rotation angle and height position. The position and limits of all the axes are determined by the encoder and the feedback of the detection of proximity sensors. Meanwhile, we utilize the PWM ( Pulse Width Modulation ) method for the speed control of brush DC motors. By coordinating the proportional enlarge output mechanism and PWM speed control system, we accomplish the design of a low-cost NC controller which met the specification of ±0.01mm in positioning accuracy. With the development of the kernel of low cost NC controller, we can upgrade the add-on value and improve the accuracy of the woodworking machinery. Furthermore, we can promote the whole value of woodworking machinery and elongate the vitality and global competitiveness of Taiwan’s woodworking machinery industry through the raise of the exporting value. Keywords: Sliding Table Sawing 、Microchi