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This paper presents a proposed method to produce parts with polygonal cross-section by turning. Based on hypotrochoid curve construction, a mechanism which combines motions of workpieces and cutting tool to machines polygons’sides is proposed. A numerical program has been established to find the optimized parameters for polygon’s properties. The results showed that the geometry character of parts which are manufactured from this method can enhanced machining efficiency, compared to conventional machine. | Đặng Anh Tuấn Tạp chí KHOA HỌC & CÔNG NGHỆ 139(09): 53 - 56 A STUDY OF POLYGONAL TURNING USING ATTACHMENT Dang Anh Tuan* College of Technology - TNU SUMMARY This paper presents a proposed method to produce parts with polygonal cross-section by turning. Based on hypotrochoid curve construction, a mechanism which combines motions of workpieces and cutting tool to machines polygons’sides is proposed. A numerical program has been established to find the optimized parameters for polygon’s properties. The results showed that the geometry character of parts which are manufactured from this method can enhanced machining efficiency, compared to conventional machine. Key word: Hypotrochoid curve, polygon, turning, machining efficiency INTRODUCTION* Polygonal surfaces are produced usually by milling or grinding on conventional or CNC multifunctional specialized machine tools[1]. Surfaces of such polygonal structures are required to meet the dimensional accuracy, shape and quality conditions in assembly[1,2]. When milling or grinding these structures, if the process area is small, there will be problem of low efficient. Polygonal turning is a new developed process which allows non-circular forms to be machined without interrupting the rotation of workpiece (During the operation, workpiece and cutters rotate withthe certain conditions) [3]. Some investigations have been done with tool-holder’s structure and the methods to machine faces[1,3,4,5]. However, these methods only produce polygons with even edges – holder mount multiple cutters, each cutter form two oppositely sides. The paper presents a method to machine parts with polygonal cross-section by turning using single cutter in holder based on hypotrochoid curve construction. distance d from the center of the interior circle c2. Assign R01/R02 =n; the parametric equationsfor the curve can be given by: b a Tool holder __ Work piece Cutter Cutter’s trajectory Figure 1. A method to machine 6-side polygon (a) and .
