[[alternative]]Study of the High Speed Spindle Cooling Structure for Vertical Machining Center

碩士電機工程學系[[abstract]]在人力與加工時間成本不斷上漲的壓力趨勢下，工具機必須邁向高速化與高加工精度發展以具備競爭力；由於，工具機主軸結構為達到高速度加工技術之首要因素之一，但因為金屬材料熱膨脹使得主軸產生熱伸長量變化，為了進一步減低工具機產生的熱源及改善其熱伸長量補償之方式，結構設計必須做不同的考量，才能達到高精度要求。 本文主要研究皮帶傳動式主軸與直接傳動式主軸之中心加工機，兩種結構分別以貫穿式與螺旋式冷卻系統所達到的冷?效果差異加以比較；並進一步探討結構設計，以溫度感測器測量高速主軸之溫升，藉由合適之放大器放大?升訊號，經由硬體電路及程式控制設計，輸出至主控制器，藉以對主軸熱伸長量補償方式研究與分析，以提高工具機加工精度及減少工序，降低成本，提高工具機之競爭能力。[[abstract]]Facing the trend of increasing manpower and processing cost, the machine tool industry requires high speed and precise processing technology to compete in the marketplace. Since machine tools’ spindle structure is one of main elements to reach high speed technology, the design of spindle structure must consider different factors to meet the high standard of precise processing. Because the thermal expansion of metal material causes the thermal growth of spindle, it is important to reduce the heat generated by machine tools and improve the way to compensate thermal elongation. The main goal of this paper is to compare different cooling effects of belt transmission spindle and direct transmission spindle by penetrating cooling system and spiraling cooling system. The design of spindle structure is also explored in the paper. The rising temperature of high speed spindle is measured by temperature sensors and enlarged by signal amplifier. Through hardware circuit and program control design, the main controller receives the message to analyze and compensate the spindle thermal growth. The design increases the processing accuracy and reduces the time and cost of machine tool; and further improves the competitive advantage of machine tool