CAD/CAM technology applies mediumly in CNC Machining
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1The characteristic of CNC Machining controls technical development as number, CNC Machining arrives with classics application in each domains, in CNC Machining process, the work out of machine program also more and more get attention. Because this CAD/CAM technology appears more and more important to CNC Machining domain. A whole CAD/CAM software system is formed by many functions module, like three-dimensional plot, graph modelling of editor, curved surface, CNC Machining, finite yuan of analysis, emulation imitate, trends shows etc. These module should be a foundation with project database, undertake unity administrative. Maintained the integrality of rock-bottom data and consistency already so, realized data to share, managing systematic natural resources and athletic time. CNC Machining basically has the following characteristic: Enhanced process capability; Improved manufacturing efficiency; Raised a product to machine precision; Reduced finished cost (if pursue 1) . Graph 12.
2The technology of control of principle machine tool of CNC Machining is realize machine tool pilot with the information of digitlization a technology, use machine tool of digital information pilot to call a number to control a machine tool, machine tool of abbreviation numerical control. Specifically, the information contrail of cutting tool shift records the digital information that always turns with code to go up in program medium, input numerical control system to pass coding, operation next, control the opposite movement of the cutting tool of the machine tool and workpiece, treatment gives the machine tool that needs work to be numerical control machine tool namely. By digital logic circuit makes first digital control system, say consequently for system of hardware numerical control. As the development of computer technology, system of hardware numerical control already was washed out gradually, those who replace is CNC of system of computerized numerical control (Computer Numerial Contro1) . The control precision of CNC depends on greatly hardware, and the function of CNC basically depends on software. All consolidate control data processing of the logistic control of CNC, geometry and cutting of executive spare parts by CPU. The control software of CNC basically accomplishs following main tasks: Systematic government; Operate the processing of the instruction; The input of part program and editor; The explanation of part program and carry out; Systematic condition shows; The hand moves data to input MDI; Breakdown calls the police and diagnose. As the progress of science and technology, numerical control technology applies at the control of the machine tool not only, still use at controlling the device of other, produced graph plotter of machine of cut of line of such as numerical control, numerical control, numerical control to measure machine, numerical control to rush cut the numerical control facility such as machine. CAD(Computer Aided Design) of CAD of 3 CAD/CAM overview can be designed make the spare parts model that satisfies a design to use a requirement to suit CAM to machine again already. CAD system is an efficient design tool, have parameter to change design function, three-dimensional and hypostatic model and graph of 2 dimension project should be changed each other and associated, CAD can be divided to be designed automatically and design two kinds interactively. Actually, have dinkum automatic design or dinkum alternant design software hardly, good software can handle automatic design and the cooperating that design interactively appropriately according to product object. Additional, open model the structure facilitates the user undertakes 2 times developing not only, also make at the same time software system itself can ceaselessly augment and perfect. The compatibility of a good CAD/CAM software and other CAD/CAM software is very important, the graphical file interface that software place takes, want to be able to support a variety of graphical file changeover, can read from other system take graphical file, or convey the graphical file of this system other system. CAM CAM (Computer Aided Manufacturing) is a general designation that shows applied computer will undertake the product is made, use the computer to assist namely complete the whole production process from former expect product, the certain segment in production process uses the computer, include to be made directly process and indirect production process, basically include the computer to assist process design and computer to assist treatment two parts. Current, the computer assists treatment is to point to machining mostly, and it is CNC Machining(Numerical ControlMachining) , its input information is the craft course of the spare parts and working procedure content, the athletic contrail that of output is treatment cutting tool (Dao Weiwen) with numerical control program. Software side know exactly about sth assists process design, computer to assist numerical control to program, computer to assist tool design, computer according to library, computer auxiliary work planning and attemper, the computer assists quality control to wait. CAM can offer process designing of a kind of seesaw pattern to produce the method that machines orbit, it includes to machine the content such as setting of parameter of set of program, cutting tool, craft. CAM software is due function of the following respects: ① can build 2 peace keeping of method of three-dimensional cutting tool; ② machines methodological diversity; Method of ③ cutting tool edits easily and revise; ④ has cutting tool and material database, make the system can make feed speed and main shaft rotate speed automatically; ⑤ has inside of buy prevent collide and had prevented cut a function; ⑥ hotshot is moved exceed tone any machine treatment default are worth (like feed speed, the) such as main shaft rotate speed; ⑦ can have imitate and estimation handling time to machining a process. Nextpage4 commonly used module 4.
The CAD/CAM system with advanced module of 1 emulation treatment offerred certain NC to emulate a function, use at checking the validity of process of cutting tool cutting, the examination is cut too and interfere a phenomenon to wait, but come through NC code directly the method that drive emulates treatment process and software are very few still. Use NC code drive to emulate treatment process in order to examine the validity of NC code is urgent need. Numerical control procedure is correct, matter to the cost of treatment directly, accordingly, CNC Machining program is before devoted and effective treatment, must undertake examining effectively mixing test and verify. Emulation cent is emulated for physics and the computer is emulated. At present the law of check proved recipe of numerical control program basically has: Cutting tool contrail is emulated and three-dimensional and dynamic cutting is emulated etc. Copy of cutting tool contrail is really check cutting tool place according to the file through reading digit extraction a knife computation is correct, whether had in machining a process, happened to cut, parameter of place choosing cutting tool, treatment parameter, machine tool parameter is reasonable, whether do cutting tool and limitative range occur interference or collision to wait. Emulation law of cutting tool contrail is a kind of more mature emulation method, graph 2 it is to use what PowerMILL software undertakes to make model the cutting tool contrail that antrum machines emulates a graph. This kind is emulated can use animation to demonstrate a method, the effect is distinct. Copy of three-dimensional and dynamic cutting is to use hypostatic modelling technology to build treatment part semifinished product, machine tool, clamping apparatus, cutting tool to wait for the hypostatic geometry model in machining a process really, use technology of sense of reality to show treatment process dynamicly come. Graph 3 it is to use what PowerMILL software undertakes to make model the three-dimensional and dynamic cutting that antrum machines emulates a graph. Graph contrail of 2 cutting tool emulates a graph 3 three-dimensional and dynamic cutting are emulated 4.
The CAD/CAM system with 2 aftertreatments program and average module of output of numerical control code uses aftertreatment program to offer the numerical control that the user turns to pile up output, make the user can use different numerical control device neatly. (The aftertreatment that 1) offers and program. Include cut of lathe, line, electric spark commonly machine tool or three-dimensional the aftertreatment program of process designing of 5 axes numerical control; (2) aftertreatment process can be delicate tone, in order to make numerical control output accords with the requirement of the user; (3) can handle NC order reversely, method of indication cutting tool. The changes CAD system benefit between 5 common CAD/CAM and PPC system often is not from its itself, pass CAM and PPC system system to come out now however; Conversely, if CAM system does not have the support of CAD system; If PPC system does not have the support of CAD and CAM, cannot get the basis that serves as a plan thoroughly, in time with accurate data already, order the plan that give to be carried out harder also carry out, plan of so called production and control will cannot get actual beneficial result. Accordingly, people begins to wait for CAD, CAE, CAPP, CAM and PPC the system organic ground, unified ground is compositive together, eliminate " of island of " automation Gu thereby, gain first-rate benefit. Home's at present most commonly used CAD/CAM software has: CAXA, PowerMILL, Master CAM, Pro/ENGINEER, UG. The implementation process of the task of actor defect CAD/CAM of 6 CAD/CAM software is very complex, describe its certainly very hard to happen early or late ordinal, it is collateral sometimes converse even, such must the participation of somebody just can give implementation. The worker in practice asks to amend generated code appropriately according to blueprint. CAD/CAM software is automatic in process designing, acquiesce of most treatment means can be used only direct and perpendicular be down feed means, if " of " appearance milling, " is planar " of finish machining of curved surface of milling " , " . The section of the center that carry a department that establishs milling cutter does not have cutting blade, the cutting capacity of perpendicular feed is very small, and keyway milling cutter is two blade cutting tool, its carry ministry edge to pass milling cutter center, have the capacity of perpendicular penetration of a cutting tool, but because keyway milling cutter has two cutting blade only, when treatment not smooth, the treatment efficiency in large area cutting is inferior, the exterior surface roughness that machines a spare parts is not quite ideal also. When machining craft aperture, the deepness control of this craft aperture wants accurate. Deepness is too shallow, make very likely in process of direct and perpendicular feed establish milling cutter attaint; deepness is too deep, exceeded the position that workpiece asks to machine, can bring about workpiece to be cut too and discard as useless. CAD/CAM software faces personal computer and composition of CNC machine tool the system of the workshop, will improve design efficiency and design quality greatly, produce the advantage of numerical control machine tool adequately, raise whole to produce a standard, implementation system is compositive make unifinication with the design. Now, CAD/CAM technology is relatively active in progress of our country economy big in urban application is increasingly wide. Software of 7 epilogue CAD/CAM, face personal computer and composition of CNC machine tool the system of the workshop, will improve design efficiency and design quality greatly, produce the advantage of numerical control machine tool adequately, raise whole to produce a standard, implementation system is compositive make unifinication with the design compositive a changing is CAD/CAM technology development most remarkable trend. It is to show PPC(of down to of a CAD, CAE, CAPP, CAM produces plan and control) organic ground combines the software that waits for all sorts of functions to differ rise, the extraction that with centralized executive control the program organizes all sorts of information, exchange, share and handle, those who assure systematic interior iformation flow is expedite coordinate each systems to move effectively. CNC Milling