Studies on the Four-axis Numerical Control Programming for Rough Cutting of the Roller Gear Cam

• Main Authors: Cho, Wei-Chi, 卓偉祺
• Other Authors: Lee, Rong-Shean
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/41480132836960309408

碩士 === 國立成功大學 === 機械工程學系 === 85 === The purpose of this thesis is to develop a method for four-axis rough machining of the Roller Gear Cam ( R.G.C. ). This methoc allows manufacturers to choose four-axis milling machines in the rough machining stage of production, thereby decreasing the cost of implementing the five-axis machining center. First, based on the relationships between cutter and roller and the conjugate movements between roller and R.G.C., the direction of the tool-axis and the position of the tool-tip are calculated by coordinate transformation. To avoid overcut between the cutter and the design surface, the surface interference checking is performed and used as a basis to select the suitable radius of the cutter. In the case of interference between the machined surface and the design surface, a method for the cutter withdrawal is proposed to solve the problem. Then, a four-axis post-processor program is developed to convert the cutter location file to actual NC code. The methods proposed in this study were all proven through solid cutting simulation software and through a trail cut with model material. For the industrial example in this thesis, the time using the five-axis machine by the proposed methods is 30% of the original roughing time using the five-axis machine. So it decrease the machining cost. At the same time, in this study, the four-axis machine removed 87% of the roughing material, so the five-axis machine had to remove only the remaining 13%. The economic value of rough milling for the R.G.C in the four-axis machine by the proposed methods has been confirmed.