这款内循环滚珠丝杠6的直径是多少？

题目：滚珠丝杠在数控机床中的应用研究及设计 摘要：本文研究了滚珠丝杠在数控机床中的应用和设计，首先介绍了滚珠丝杠的结构和原理，分析了其在数控机床中的优势和不足。随后，对数控机床的工作原理进行了简单的介绍，并对滚珠丝杠在数控机床中的设计进行了详细的研究。具体包括滚珠丝杠的选型、传动系统的设计、传动效率的计算以及传动系统的优化等方面。最后，对研究结果进行了总结，并对今后滚珠丝杠在数控机床中的应用和研究方向进行了展望。 关键词：滚珠丝杠；数控机床；应用；设计 Abstract: This paper studies the application and design of ball screw in CNC machine tools. Firstly, the structure and principle of ball screw are introduced, and its advantages and disadvantages in CNC machine tools are analyzed. Then, the working principle of CNC machine tools is briefly introduced, and the design of ball screw in CNC machine tools is studied in detail. Specifically, it includes the selection of ball screw, the design of transmission system, the calculation of transmission efficiency, and the optimization of transmission system. Finally, the research results are summarized, and the application and research direction of ball screw in CNC machine tools in the future are prospected. Keywords: ball screw; CNC machine tool; application; design