Development and Application of a Postprocessor for Five-axis Machining
| Autor: | Meng-Lin Wu, 吳孟霖 |
|---|---|
| Rok vydání: | 2007 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 95 5-axis machines have already applied to cut the complicated part and surface extensively, especially the impellers cutting of the compressor and turbine. And it is an efficient machine tool of the high value-added component machining at present. It is difficult to complete the 5-axis part program in handwritten way. The CAD/CAM systems generated cutter location data have to be changed into the one that is acceptable to 5-axis machine tool through the postprocessor. The postprocessor is the important interface in computer aided process planning and NC (numerical control) machining because it is used to change cutter location file designed by CAD/CAM systems into the NC-code that is acceptable to 5-axis machine tools. But generally the postprocessor module in CAD/CAM is specialized that it can’t apply to other machines. In order to develop a new 5-axis machining process and do an examination, we have to set up a 5-axis postprocessor. This paper constructed the postprocessor which is suitable for the 5-axis machine (X, Y, Z, B, and C axes), table-tilting type with Matlab. In this program process, we use the method of homogenous transformation matrix to describe the relation between workpiece coordinate system and cutting tool coordinate system and use the modified D-H matrix to calculate 5-axis real kinematics values. In order to prove the postprocessor, we have taken 5-axis milling operations in Unigraphics CAD/CAM system as verification examples and transformed the tool paths into 5-axis NC-code. The result is exactly. The developed postprocessor can apply to transforming part program of present 5-axis machine. After planning the tool path (tool location and tool axis orientation), the postprocessor can produce NC program correctly. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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