Design and manufacturing of regular polygon turning mechanisms

• Main Authors: Chen, Te-Jen, 陳得仁
• Other Authors: Chen, Wei-Fang
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/90258146444710779939

碩士 === 遠東科技大學 === 機械工程研究所在職專班 === 103 === Cutting efficiency is determined by the relative velocity between the cutting tool and the workpiece. The gyration radius of lathe is decided by the workpiece dimensions. Therefore, the lathe generally has a larger radius of cutting rotation. Thus, the relative speed is faster between cutting tool and the workpiece, and cutting is usually more efficient than other cutting machine tools such as milling machines, planers, etc. Lathe machining is one of the common machine tools. Lathe is mainly used for machining cylindrical or symmetry of parts. The lathe machine tools are widely used in the machinery manufacturing. Factories usually use lathe for cutting. The lathe is convenient, simple to operate, highly efficient, and has a low price, but the lathe generally can only conduct a circular symmetry machining of the workpiece. Although the mill-turn multi-tasking machine can cut asymmetric complex workpieces, it can only change the form of four-axis milling processes, and the efficiency is not improved. In recent years, the is a increase in the common use of a regular polygon. However, we must purchase a dedicated special CNC turning machines to turn to regular polygon. Since equipments are very expensive, many manufacturers need this processing function prohibitively. Turning regular polygon is mainly used for turret rotation and co-rotating with the workpiece. If there is a proper distance and a rotation with certain proportions, the workpiece axis and turret axis can cut out the approximate line of the curve shape. If the rotational speed has a correct ratio and the length of cutting tool, turret axis, and the workpiece axis have appropriate distances, we can cut out the needed regular polygon approximation. Most iv general polygon turning mechanisms are mounted on the mill-turn multi-tasking machine, which increases the turning regular polygon features, but also increases the price. This is especially true for manufacturers who do not have this machine tool, and is causing large financial burden. Turning a regular polygon is an approximation. Many people only know this is an approximate and do not know the true value of the error. Furthermore, adjusting the distance between turret axis and the axis of the workpiece can make polygon turning closer to the regular polygon shape. We can even reversely derivate the distance and speed ratio between turret axis and the axis of the workpiece by using the best number of sides of the polygon and the best side length. This paper will be developing power-rotating turret for conventional lathes and CNC lathes. We will study optimization for turning approximate regular polygon, and how to turn out the most accurate regular polygon. Under the known conditions on the number of sides and edge length of the polygon, we will study how to best obtain the length and quantity of cutting tool, and the distance and ratio of rotational speed between rotational turret axis and the axis of the workpiece.