As the development of the progress of the times and socioeconomy, especially the progress of modern science and technology, use free curved surface already extensively in all trades and professions. In using a process, how a very serious problem is opposite namely free curved surface undertakes accurate and efficient design. Appeared nowadays CAD system and numerical control machine tool, solved design and create a problem. This Wen Jian should analyse the design of the free curved surface that is based on CATIA and CNC Machining, the hope can offer a few valuable referenced opinions. Free curved surface is general relatively complex, having relatively trival computation and more block. Manual process designing is exposed gradually in carrying out a process came out a series of problem, so as far as possible will automatic process designing comes over to application. In the process of automatic process designing, programmer links part drawing appearance and craft demand, will relevant CAD/CAM software comes over to application, have the aid of builds a model at CAD module implementation, use CAM module to produce cutting tool method next, numerical control program handles a program to arise by postposition, have the aid of is transmitted to numerical control machine tool at software, the treatment of so free curved surface got finishing. The design CATIA of the 1 free curved surface that is based on CATIA is the design software of on the world one kind of mainstream. It is applied extensively to each domains, its compositive solution can undertake enclothing with production domain to all products plan, peculiar electronic prototype module and mix the technology that build a model, the enterprise can promote competition ability and productivity on older rate. Understand for convenient people, we with Sa Kesi chirp piece for exemple, undertook an analysis. Compose establishs Sa Kesi sentry post piece curved surface model: Menu is pulled to begin on the choice / the groovy curved surface of appearance designs a command, the system can shoot a corresponding dialog box. In inputting the spare parts name that need establishs component name, entered a spare parts to design platform so. In nodding definition dialog box, the definition is on Zx plane the dot that corresponding coordinate is worth; Use same method, found a certain number of dot go up at Zx plane. Found curve of a batten, assure to be able to be passed above the point that establishs. fast clip tool application comes over, will right end of the curve gives prune away, give cutout to get rid of axes next, give draft scale workbench exit, in returning a spare parts to design workbench, in the dialog box, undertake to referenced face compose is built. According to afore-mentioned measure, found batten curve go up at referenced plane, found next horizontal, its start is the left end points of batten curve. Come over this kind of method application, referenced to additionally 13 plane undertakes founding, and get on corresponding batten curve scale at referenced face. In defining a dialog box, curve of effective union batten and linear. Use same method, the batten curve that combines other draft and linear, conceal corresponding draft, can get curve of a group of union. In dialog box of definition of much more sectional curved surface, can found much cut curved surface effectively. The CNC Machining of the 2 free curved surface that are based on CATIA we still Sa Kesi chirp piece application comes over, to undertake installing to machining parameter better, the sentry post that establishs above paragraphs institute with respect to need piece do not need to machine partial purify to drop in the model, the partial reservation that machines need only comes down, still fall pull menu, undertake choosing to processing an order, entered curved surface to machine module so, in the dialog box that founds in semifinished product, undertake choosing to target spare parts, founded semifinished product spare parts successfully so. Activation semifinished product spare parts, enter a spare parts to design module, the dot that corresponding coordinate is worth is founded go up at Xy plane, such better with respect to the origin that can fasten to working coordinate and coordinate settings. Finish after founding, return curved surface to machine module. It is to treatment element undertakes installing: The dialog box is operated in the spare parts, to each treatment element undertakes installing, exactly the amount accuses body of department of machine tool, referenced coordinate, geometry to wait. In dialog box of editor of numerical control machine tool, undertake choosing to machine tool of 3 axes linkage. In consulting coordinate fastens definition dialog box, the name that can tie to this coordinate undertakes installing, to the dialog box medium origin is clicked, undertook choosing to what beforehand founds, to the dialog box medium Z axis undertakes clicking, the system can be played give a dialog box, undertake choosing to appointing a law by hand, set Z axis, to the dialog box medium X axis undertakes clicking, the system can shoot a dialog box, undertake choosing to appointing a law by hand likewise, set X axis. The field is set in geometrical parameter, in treatment target spare parts chooses a side, target spare parts treatment commands the input comes in, logical to character choice. It is to semifinished product the model undertakes choosing next, name of semifinished product spare parts the input comes in, reasonable undertake choosing to character. Will safe plane commands the input comes in, undertake choosing to the surface on semifinished product, such reasonable settings machine parameter. 2 it is CATIA imitate treatment: Inserting positional respect, choose relevant node, command Sweeping Rough to the input comes in, the system can be played give a dialog box. In the division of treatment region response of the dialog box, undertake choosing to target spare parts. After the choice, the model of written characters that can have treatment part appears on the spare parts, after the choice that finish, in can returning a dialog box. In the dialog box, go up to machining area slant buy model of written characters undertakes doubleclicking, 0. 0 millimeter are inputted play the numeric draw a frame round that give. Because use, is Lu Zhu, having lesser cutting power, the method that can shape cutting so comes over to application. cutting tool name and command of cutting tool parameter the input comes in, machining what cutting tool respect chooses is ball head stands milling cutter, cutting blade bestrewed ball head to go up, circular arc join is circumferential blade and ball head blade, can radial and axial feed. In taper seat, cylinder face and spherical go up, use this kind of milling cutter to be able to serve as its advocate cutting knife, in the process of cutting, can do feed to move along milling cutter axial not only, also can do feed exercise along milling cutter radial, and often realized the contact of ball head and workpiece, numerical control machine tool is controlling milling cutter, can be opposite very complex shape the surface undertakes machining. The relevant dialog box that we install in parameter, in CATIACNC Machining system input ball head establishs each parameter of milling cutter, so that begin CNC Machining smoothly. 3 be numerical control program generate: In character, undertake choosing to corresponding node, in playing the quick menu that go out, generate order of numerical control order to undertake choosing to seesaw pattern, the system is played give a dialog box, in list circle is drawn below format of numerical control data, undertake choosing to numerical control program. To numerical control program card undertakes choosing, falling in drawing list circle, undertake choosing to a kind of block format. In this dialog box, can undertake examine and be modificationed to the format of numerical control program. It is then in the dialog box, name of a program the input comes in. Continue next, can create numerical control program successfully. When inputting CNC Milling special program, manual input and computer input two kinds of means is feasible. Because construction means is having bigger workload and inferior efficiency, easily the mistake appears, accordingly, the means that transmits computer normally comes over to application. 3 epilogue analyse us to be able to be informed through the narration of this article, free curved surface is relatively complex, having more machine program, design and treatment rise relatively complex. Be aimed at this kind of circumstance, can come over CATIA to application. Use CNC Machining technology, can make efficiency and quality get remarkable promotion. The ceaseless effort that the member that relevant design machines a person needs, learn an advanced technique actively, master adroitly to the operation method of CATIA, better application, so that promote freedom the design of curved surface and CNC Machining quality. Author: Ren Xiaoping CNC Milling
CNC Machining