| Associating with the National Science and Technology Major Project, the National NaturalScience Funds and requirements from aviation manufacture industry, an Approach to Automatic NCProcess Decision-Making Technology for Pocket Feature of Aircraft Structural Parts were deeplystudied. The main achievements of this paper were as follows:1) A region-division-based method was proposed to address the problem concerningAutomatic Rough-Machining Process Decision-Making. The definition and division-rules ofRough-Machining-Region were provided. Take the Rough-Machining-Region as a unit to reason theeasily-deformed position, Semi-Finish-Machining position, to create Machining-Region boundary, tochoose the reasonable machining parameters and tool parameters. Release the stress ofeasily-deformed position by slotting. Reduce Non-Machining-Time by reducing the number anddistance of the Approach-Retract, and by reducing the linking distance between two operations.Arrange Semi-Finish-Machining after Rough-Machining to ensure the uniformity ofMachining-Remaining and to make a smooth Finish-Machining. The Automatic Creating of theRough-Machining tool path was realized.2) A method based on Same-Height-Machining-Layer was proposed to address the problemconcerning obtaining the Wall Finish-Machining Drive-Information of Pocket Feature in AircraftStructural Parts. The method combine layer to obtain the Same-Height-Machining-Layer. Divide eachSame Height Machining Layer into a series of regions. Determine the Machining-Mode of theTool-Axis according to the Machining Wall, and then obtain the Wall Finish-MachiningDrive-Information.3) A loop-analysis-based method was proposed to address the problem concerning creatingbottom finishing region of Pocket Feature in Aircraft Structural Parts. In this method, the boundary ofexterior loop of the generalized sides and generalized bottoms of the Pocket Feature are projected tothe bottom. Then these curves are discretized to a set of lines. After that, tailor the lines with thecalculation of all the intersections. Ultimately, using the Line-Rotate method to analyze the loop andget the optimized bottom finish machining region.4) The Rapid NC Programming System for Pocket Feature of Aircraft Structural Parts,whichhas improved the efficiency and quality of the NC Programming of Pocket Feature, has been deployedin a large-scale aviation manufacturing enterprise. |
