The numerical control machining of a certain frame of the application is one of the key projects of a certain aircraft. It is difficult to process. The part is the main force of the fuselage. The size of the component is large and complex. We use the three-axis CNC machining and UG software system programming according to the actual situation of the company equipment. The quality of the products processed by some effective measures is in full compliance with the design requirements. The relevant situation is introduced as follows. A structural example of the structure of a frame is shown in the figure. The shape of the part is reversed from the theoretical shape and the front frame edge has an equidistant surface. The inner contour surface with the equidistant surface composition and thus the shape of the part forming the plurality of depression frames is the torsion surface. The curved surface is gradually transitioned from the closed angle to the front and rear edge surfaces of the open corner frame, and the web thickness of the frame is 1.5. The thickness of the mm edge strip is 2mm. It is a typical thin-walled structural part plus the size of the part. The large-wall thin frame has many holes and no holes. Therefore, the structure of the easily deformed member is processed. The second machine tool is selected and the processing method is determined. Machining deformation requires repeated trimming of the front and back of the part for machining. The height of the front edge of the frame edge is retained when the frame edge of the frame is finished. It acts as a machining support point to prevent deformation caused by vibration. 3. Programming calculation uses a software system to program a frame. The processing function of the software is more complete and flexible than the 10.3 version and the simulation function can be added to effectively reduce the human error. Through simulation, the machining path of the machining can be checked and analyzed before machining to ensure that there is no error in the processing with good predictability and transparency. (The theoretical shape data of the digital-analog surface is provided by the collaborative computing center to provide only frame-type components for CNC machining. The application of Zhang Lihong's beveling in the module is built by the method of sculpting the surface of the module. In order to facilitate the machining calculation, the programming calculation of the whole surface of the digital-analog surface is established. It can be seen that the front frame edge and the rear frame edge of the frame part are not in the shape. There are many depressions on one plane and the front and rear frame edge faces in order to effectively ensure the movement of the milling cutter in the required area to avoid machining interference due to inaccurate area control. The fixed axis surface machining method is selected in the machining module. Perform programming calculations (3 tool position control area determination and tool path generation using fixed axis surface plus The method needs to give the area control polygon. Therefore, the INFO module of the UG first analyzes and analyzes the digital-analog surface of the part to find the parts with different oblique angles of the surface, and then respectively makes the CURVE module according to the opening and closing angle surface and the sinking surface of the part. Part of the processing area control polygon then selects the appropriate tool by the machining module to select the appropriate tool to generate the corresponding tool path track file, so as to ensure that the part profile conforms to the digital mode and effectively guarantees the high precision of the processed surface. Programming to solve several major technical problems (1 programming method of closed-angle surface part root R is realized by tool radius R, so the milling cutter defined by TOOL module in UGTOOLBOX function menu can know the T-milling cutter If the cutting edge is only 3mm, the cutting allowance is more than 3mm. If the cutting edge is easy to damage, the surface of the tool part will be damaged. The following two programming methods can be used to solve this problem. 1 For the machining boundary without strict control of the part, Machining area polygons make part boundaries. A tool diameter makes the machining infeed action outside the part. 2 For the boundary of the part that must be strictly controlled, make an auxiliary plane whose surface must be at an angle to the projection vector of the tool path. See the machining infeed on the auxiliary plane. (2) The programming method of the 2 sinking method has a number of sag and sag connections. See R4 and EE. R4 is guaranteed by the tool radius. The round end milling cutter is one of the largest and easy to break the knife. It is time consuming. So we use two kinds of tools to calculate the tool position. The first end mill will be zero. The sag surface and the sag connection R4EE section R4 machined out and used the end mill along the sag edge to mill out the sag connection R4 shown in the (3) frame contour programming method 1 in order to avoid parts in the process The thickness of the rib caused by the file is out of tolerance. The way of feeding the milling contour is changed from linear feed to circular feed. The UG plane machining module sets the IL advance and retreat in the selection to - circular arc. The size of the arc can be reversed by the direction of the N-cut in the plane machining module of UG given the contour of the roughing frame. The table will not be moved when the milling is reversed, but it will not be used when finishing the frame contour. The cutting force is small in order to meet the surface roughness requirements. The cutting method is selected for the cutting direction. (4) The programming method for the inner surface of the closed curved surface must be entered in the EDIT function menu of the UG when calculating the tool position of the closed curved surface. The module cuts the part of the surface that is not to be machined by the main plane, sees the inner surface of the surface to be machined by the arrow, and then calculates the tool position by the machining module for the specified range of the machining area. Otherwise, the tool position calculation is due to the closed surface. Interference Now UG defined T-milling cutter assisted inner surface machining side computer-aided design and manufacturing 2D drawing function of CATIA software 2D drawing of piston mold C numerical control programming In the piston mold we only have the core mold and the outer mold According to the previous processing technology and the function of NC programming of CATIA software, the machining is divided into rough machining, semi-finishing, and root finishing. Local finishing. In the specific programming process, we used different NC programming methods of CATIA software. 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