Profile modeling / the development that CAD/CAM unifinication application software includes and research

1, the introductive 　 rapid development as modern industry, of the product change rate is rapidder and rapidder, while all sorts of products are improving performance ceaselessly, its appearance also becomes more and more complex. The design makes an industry want to produce the product that gives high quality with the cost of the rapiddest rate and lowest, apply advanced design method and CAD/CAM only compositive production technology. In recent years, because CNC machine tool and PC cost are reduced greatly, general manufacturer can provide the hardware facility with complete function, under photograph comparing, the development of outstanding software has economic sense more. The application of CAD/CAM technology can reduce the workload that designs staff greatly, have very high design and treatment precision. But, in products plan initial stage, need has much consideration, measure, plot and to program job, the CAD system that has namely is right of parameter of sealed detailed design already shaped the product cannot try to absorb and be used directly, this increased new development and the time that design a product relatively. Profile modeling system is processing the concerned technology data of sealed treatment product, or have complex appearance already shaped product side, have original advantage. However, itself of profile modeling system has very big limitation again, the product outline graph that its form cannot undertake inquiring, revise and further the analysis works, namely it can undertake to having a product simple copy is machined only, undertake very hard develop and be improvemented to the product alone. CAM system is divided outside having perfect treatment program and aftertreatment function, commonly still stronger figure designs ability, can realize the connection with CNC machine tool. To use the design achievement of domestic and international existing product better, shorten product development cycle, the fast, treatment that realizes a product conveniently, answer to produce the advantage of profile modeling, CAD and CAM system adequately, do well 3 person the interface between, implementation advantage is complementary share with data. Additional, CNC machine tool and profile modeling / CAD/CAM system join rises make online system, implement design and process designing automation, issue the order that pass NC quickly, undertake long-range management or monitoring to numerical control machine tool, the advantage that can develop numerical control machine tool more, improve level of management [1] . This software wove the interface program between profile modeling and CAD/CAM system, use the 2 development function of AutoCAD, made CAD function patulous module, be based on Windows 95, profile modeling, CAD, CAM and numerical control machine tool compositive at a system. 2, the choice 　 AutoCAD of software of CAD, CAM is American Autodesk company the commercial CAD software that roll out. Can move at 16 to mix 32 personal computer, it is current one of the most popular CAD software, many user is had in our country. Because AutoCAD software is had,open model structure, include Auto LISP of an in-house programming language, this not only provided a 2 development platform to the user, also assured systematic itself ceaselessly augment and perfect. Since since coming out 1982, already rolled out 2000 version at present, the three-dimensional mapping system that AutoCAD already developed to be abounded to the function from system of mapping of design of a 2 dimension, can undertake lifelike beautiful animation is designed. A lot of factories of our country, enterprise and design department have graphical scale and government with AutoCAD, because introduce the standard of foreign software, habit to differ, often need to undertake improve and be perfectinged, development gets used to GB and the graphical library of this industry, be like surface roughness, form tolerancepublic errand, typical spare parts. Additional, each industry all has corresponding national level or occupation standard, because this need builds corresponding fundamental database [2] . This software is based on afore-mentioned circumstances just about, consider to handle the convenient sex of graph of result of common profile modeling, undertake 2 times developing on the foundation of AutoCAD R13. The wide application of CNC machine tool and PC, promoted the development of CAM software greatly, the common can run at workstation and personal computer CAM software package on the market has SurfCAM, unigraphics, edgeCAM, pro/Engineer, cimatron and MasterCAM. Popularize the need with gender and compositive system considering application, this software used the market to have the MasterCAM with higher rate to regard the CAM with AutoCAD and connection of profile modeling system as software. MasterCAM is the collect CAD that develops by CNC Software company and CAM function the application software at an organic whole, v5.

The version of 0 above is based on Windows operating system. This software besides having general CAD constructive function, to get used to the need that the spare parts machines, still added stronger curve and function of curved surface modelling. Three-dimensional model goes to the lavatory is a of MasterCAM outstanding characteristic. In addition, strengthen model dimension of ANSI, ISO, DIN is tagged reach thalweg function, make the CAD function of MasterCAM more perfect. In CAM respect, it has turning, milling, auger cut, a variety of treatment methods such as line cut, the treatment parameter of the diversity that machines means choice and seesaw pattern is installed, also bring to the person that use convenient. Additional, masterCAD is offerred inside the interface of two-way graph file of outfit, include STA, IGES, VDA, DXF, CDL, STL and ASCII, this makes it facilitates not only the figure that accepts other system, the graph that also makes oneself is made facilitates apply in other system [3] . MasterCAM has the function that carries R232 interface and news report of treatment machine tool. 3, the appearance outline curve that the working principle of system of the profile modeling of analysis of profile modeling file and interface program that make is the three-dimensional and hypostatic model that uses profile modeling probe to already will exist or curved surface undertake digitlization, the data that measures place keeps a file, pass next a series of the preparation before treatment, if parameter of choice of cutting tool set, compensation, treatment is installed,wait, the outline data that the system records according to the place in the file again, good according to the regulation treatment step undertakes cutting is machined [4] . This software uses the RENSCAN 200 of system of profile modeling software that British RENISHAW company releases, it deserves to have but the interface of slot of expansion of stick personal computer gets stuck, the scanning head that an outfit carries in machine tool main shaft and group of bougie of a scanning. When profile modeling, the bougie that chooses some diameter according to the appearance curvature of hypostatic model scans on numerical control machine tool and make data file, this data file can edit in text editor and revise, its form is as follows: 　 of 　 of X ***** Y ***** Z ***** ... 　 in fact, the contrail of the aspect that when the value of the X in the file, Y, Z scans for bougie namely, explores according to the step pitch of set. Measure the program before the course after ending is machined, can generate NC machine program. NC program is transmitted through R232 communication interface to numerical control machine tool, the cutting that finish is machined [5] . The article used two kinds of means to realize the communication between profile modeling file and CAD/CAM software. (1) uses DXF file communication to be in profile modeling software, generate * of scanning data file.

2 dimension of PRD() or * . CPT(is three-dimensional) later, through changing a setting, can generate patulous name to be the copying file of PUN further. PUN file also is file of a kind of text, its format and DXF file are similar, undertake handling to this kind of file with ＋ of Visual C ＋ , the partial reservation that accords with DXF file among them, the part that does not accord with is deleted, reach the article head of the file article end to be written into the format of DXF file, become standard figure to exchange file DXF document namely. Use this document, can rise profile modeling system and CAD or CAM software connection. (2) uses ASCII file communication to regard the interface file between profile modeling system and MasterCAM as ASCII file, and can connect directly through DXF file between MasterCAM and AutoCAD dispatch, the file extraction that can generate profile modeling so comes CAD or CAM system. The data storage means of file of the ASCII in keeping format and MasterCAM system through analysing the book of file of profile modeling data, write the interface program that both changes each other with Visual C++ . The function of the program basically includes two fields: The first, read in file of profile modeling data and build its the pattern of instead ASCII file, for when MasterCAM makes a figure, be being called; The 2nd, read in ASCII file and build its the pattern of file of instead profile modeling, for be being used when copying. The 2nd respect of program function basically is to consider copying program function is when the part that treats certain and special type very convenient (for instance cam machines the) such as the changeover of fair master mold with the mould, before the figure that need of the person that use sometimes will be designed in MasterCAM or AutoCAD and has revised returns profile modeling system to undertake machining, plan and generate NC to process code. 4, CAD system function expands this module is to be based on AutoCAD software to develop, aim to use AutoCAD to powerful figure is designed and develop a function 2 times, the graph that to profile modeling changeover comes over undertakes inquiring, revise and further the analysis works. This module basically uses Auto Lisp to write, still applied AutoCAD at the same time piece, form, slide show is made, the function such as menu work out, to the standard with mechanical commonly used cartography, for constructive when can retrieve a concerned data automatically, still made data filestore these data, make establish connection with corresponding Lisp program. The function of this module basically has: 1) revises circular arc the curvature of some part: But to the random on the curve that already made two curvature radius undertakes modification; The cross section of 2) curved surface makes: Can make the outline curve with the aleatoric sectional way that already was put in curved surface, use at the three-dimensional model that gets to profile modeling to undertake analysis and design; 3) curved surface makes: With Yu Kun the curved surface such as type curved surface, drive curved surface, whirly curved surface is made; 4) cam designs: Give the foregone condition such as basic circle, actuating travel, return trip, can make cam of push rod of point contact type automatically (etc fast cam, wait to wait for decelerate cam, Jian Xie quickly cam of motion of oscillation cam, SIN) of cam curve and COS cylinder cam develop a plan. Basically use at the analysis to result of cam profile modeling and comparative design; 5) form tolerancepublic errand tags automatically: Give advocate after parameter, the correspondence in can retrieving mark going abroad automatically at advocate the form of parameter tolerancepublic errand value. In the meantime, also gave out an element that be measured by form of two kinds of above the form when tolerancepublic errand is restricted tag a method automatically of tolerancepublic errand; 6) surface roughness tags: The method that gave out to use purify data and need not the tagging of the exterior surface roughness that the method of purify material achieves; 7) commonly used standard component generates automatically: Centered the brushwork of spare parts of a few kinds of commonly used standards, wait like whorl, key, bearing, bedspring, gear, contact with relevant Lisp program and data file, facilitate automatic and constructive; Give typical examples of 8) typical spare parts: Listed the common three-dimensional substance in more than kinds of 20 project and 2 dimension curve. It is a foundation with the standard bill of fare of AutoCAD, raised one level next pulling child menu " TGMC " will govern afore-mentioned each functions, among them 8) of functional 3) ～ still made icon menu, use in order to go to the lavatory. 5, the system is compositive mix to make each function can change above first immediately use at the same time, be based on Windows 95, the article made a software compositive system. The system uses Visual Basic consummate, profile modeling, CAD and CAM software can run at the same time after entering a system. If the graph is shown 1 times,the structure of compositive system pursues. Graph 1 compositive construction of system pursues 6, this software wraps conclusion to concern through establishing the communication between profile modeling and CAD/CAM, realized profile modeling / CAD/CAM unifinication. Use profile modeling result at products plan, make profile modeling function got great and patulous, shortened product development cycle, can use the design achievement of existing product effectively. CAD function is patulous the application of module, make analyse and revise of graph of profile modeling result more convenient, data of facilitating output technology and technical file file. Use CAM software (or profile modeling software) rich treatment program and aftertreatment function, realize the final treatment of the product. Whole software is based on Windows platform job, convenient and efficient. CNC Milling