The computer emulates a technology to process medium application in electric spark

According To This System, the Way To Machine The Thick Wordpiece Is Found, and Workpiece With 805 Mm Thickness Is Machined Stably.

The Simulation Technology Is Also Used To Study The Thermal Model Of EDM.

Optimize 　 of 　 of 　 of Neural Entwork of 　 of 　 of EDM Machining of 　 of 　 of Keywords 　 Computer Simulation in last few years, of system of the improvement as technology of pulse power source, numerical control introduce and the adoption of artificial intelligence technology, the process capability of EDM got very big rise, also make the maneuverability of EDM machine tool increases greatly, but the research that machines mechanism to its fails to have greater progress all the time however, this is machining mechanism at EDM on one hand too complex, involve electromagnetism field, maximum pressure all sorts of theory such as explosion of physics of electrostatic, hydromechanical, dielectric, plasma physics, underwater, and a little academic itself also remains at new knowledge, make EDM machines mechanism to fail to be broken through somewhat all the time in last few years. But on the other hand, those who study a method is backward also be one of main reasons. Of computer function rise increasingly make the emulation technology application in industry wider and wider, the research that also gives EDM theory brought new thinking, make we overcome the limitation of traditional research technique likely, thorough research announces the microcosmic circumstance of discharge process and essence, build the model that reflects discharge objective law, provide reliable academic basis to the machine tool is designed and machine control. 1 computer emulation technology and because EDM treatment mechanism is too complex,its apply mediumly in EDM, also fail up to now true from theoretic solve all sorts of treatment parameter to concern to machining the influence of function, of experience formula often make too simply predict the result is mixed again differ actually very far, this brought about the occurrence of technical data library, technical data library and the systematic development that have on this foundation promoted the development of electric spark processing technique greatly, also went to the lavatory to operate personnel, make they do not need to have too much professional knowledge to be able to open motive bed, the treatment that finish asks. But the data that processes data table actually or the experience that rely on specialized worker get, and whether are these experience data best data, depend on completely itself of unit of machine tool production, because this wants to make,the processability below certain condition can be achieved best, and in how passing treatment database already some data will extend the size range of pipe bent, research that optimizes parameter to wait to still need more thorough ground to develop pair of treatment mechanism. Emulation technology agrees with quite research machines mechanism of this kind of treatment to be made clear not completely still like electric spark, but had had regular experience knowledge system again. Emulation technology already also received wide application in EDM domain. Graph the 1 fundamental that showed the computer is emulated. Graph 1 computer emulation fundamental pursues from the graph 1 in can see, the main meaning that the computer emulates basically reflects in: 1) perfects systematic model: System of electric spark treatment is nonlinear system, know systematic input and output only, and the interior construction that does not know a system and structural parameter. But as a result of the certain experience knowledge that has had, can construct contain assumed systematic concept model simply, use this concept model to undertake emulation an experiment next, amend the structure of the model and parameter according to regular method in the experiment, the input that satisfies foregone system what make finally outputs a relation, build as similar as systematic feature maths model thereby, can use emulation technology to realize EDM to machine craft to build a model; 2) forecasts: Benefit is emulated with the computer can avert direct experiment, what can forecast a system at the same time is characteristic, study the craft law that electric spark machines further, deepen the understanding that machines mechanism to electric spark; 3) optimizes a design: On the base that already built a model, it is certain to apply optimize a technology to be able to realize the craft parameter optimization that appoints treatment to ask to fall on the computer, in the meantime, in the design process that waits for a part in power source of electric spark pulse and control system, need undertakes to the system function is forecasted optimize with parameter, so that make,the system of a design reachs best target. And systematic design needs to often relapse again, because this needs to use emulation technology,come subdesign; 4) duplicate tests: Duplicate tests is systems analysis and the requirement that design a medium special nature, should make a true system is in identical environment duplicate tests is very difficult, it is more difficult that the system that to electric spark treatment has certain and random sex this kind should realize content reason duplicate tests, and use emulation technology to be able to assure to be installed in identical parameter and identical output gets below input condition; 5) economy and security: The test has on machine tool of electric spark treatment not only take time, cost is high also, accordingly, what should undertake to craft rule the system studies existence is actual is difficult. Additional, certain technology rule also can not develop research certainly on the machine tool, the electric arc discharge with the research that is like pair of big ply treatment, deep alveolus or easy ruinous generation, photograph comparing, emulation experiment not only cost is low, and on the safe side. Because the computer is emulated,have afore-mentioned a series of advantages, we forecast those who reach craft parameter to optimize in what electric spark machines craft effect and the research with how use emulation technology to study electric spark machined the respect such as mechanism to spread out certain. Of the treatment function such as surface roughness of speed of treatment of 2 　 EDM, surface forecast reach optimize want surface roughness of pair of treatment speed, surface to undertake forecasting, and realize those who machine parameter to optimize, want to build surface roughness of treatment speed surface to wait for a model above all. The method that builds a model is general and linear regression, differential the method such as network of equation, nerve. At present commonly used EDM establishs modular method is to use regression to build electric spark to machine rate model or model of exterior surface roughness theoretically, be like Anand Srinivas [3] , M.

Kishi [4] , Y.

S.

Liao [8] wait for a person to use much target to optimize the treatment that studied WEDM with recursive analysis ply of the index such as surface roughness of speed, surface and electrode silk diameter, workpiece and arteries and veins are wide wait for the relation between parameter. It is fast, OK that the advantage that returns to an analysis depends on computational speed the maths that reachs one is made clear is formulary. To raise the recursive precision of the model, still need to add the assorted factor between variable high-ranking quantity and independent variable commonly, because of this number when independent variable relatively a long time, the form that returns to equation decides hard. Because return to an analysis to be put in afore-mentioned defect, the theoretical model that electric spark machines is hard to build again, people begins to change the look to nerve the contemporary method building a model such as the network. According to the basic theory of nerve network, either can use even add function structure of network of a three-layer to come imitate. Should give out only proper network structure, after through deciding a network to the study of example data the authority between each unit is worth a relation, network model can get establish, later if have new example data, can learn a function to make the network gets used to new sample book again through the network, and need not build a model afresh. Compare with linear regression, nerve network has function of self-study be used to not only, and not sensitive to the amount of independent variable, of the independent variable in nonexistent also linear regression rank second be decided really and the assorted problem between independent variable, because this is below the circumstance with more independent variable,build a model to appear more appropriate with nerve network, and electric spark treatment is attributing this kind of situation. Compare with photograph of EDM form cutting, WEDM influence parameter should be gotten less much, use what all sorts of method methods are opposite to undertake study easily, the influence to machining function already became all sorts of influence parameter in studying with the theory such as nerve network WEDM machines a process a current heat. Be like Y.

S.

Tarng [6] with T.

A.

The person such as Spedding [5, 7] build treatment speed and model of exterior surface roughness to WEDM treatment process with nerve network, optimize treatment parameter with imitate anneal algorithm next, emulation result and experimental data are relatively consistent. To the influence of EDM form cutting parameter compares WEDM more, difficulty also wants a few bigger, the craft that is aimed at EDM form cutting at present builds a model to consider also terribly is scarce. We think through the analysis the factor that affects performance of EDM form cutting basically is: Tdn of the Tpff between wide Ton of Ip of peak value electric current, arteries and veins, arteries and veins, handling time, carry knife time Tup, and can main body machines processability now speed and exterior surface roughness, because if the graph is shown 2 times,this can build model of craft of electric spark form cutting, and next watches forecast result and watch of experimental data contrast to use what this model gets. Graph model of network of nerve of form cutting of 2 electric spark forecasts S of μ of the T/ between arteries and veins of S of μ of wide T/ of arteries and veins of I/A of result and electric current of peak value of primitive data table to carry value of experiment of μ MMRR(mm3/min) of T/sRa/ of treatment of S of knife T/ μ forecasts value error (%) experiment value forecasts value error (%)2.

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2 note: Machine a condition: Cu(＋ ) - Steel(- ) 　 can see from the data in the watch, the data that uses this model to forecast and the experimental data phase in machining data to express are compared, major error is in 10 % less than, explain this model can calculate treatment rate accurately thereby. Use this model to be able to forecast surface roughness of treatment speed, surface not only, still can use optimize treatment parameter. Change directional development to level to intelligence for EDM machine tool thereby road, it is OK that the new hand that can invite report to machine does not need those who pass too much time to groom treatment gives the product that accords with a requirement. For this, we used nerve network to build the emulation system of line cut treatment, its are basic block diagram is shown 3 times like the graph. Graph in the emulation research process that emulation system of treatment of 3 lines cut is using this to emulate a system to be machined to WEDM, we still discover an interesting phenomenon, it is namely below function of particular treatment electric current, when workpiece achieves certain ply, treatment speed begins to drop apparently, explain treatment is not right now stable already, but if improve a summit,be worth electric current right now, can make machine be able to on the rails. We are accordingly conjectural, want workpiece of cut big ply to must want to have electricity of corresponding high peak value, according to this speculation we succeed ground cut the workpiece that ply amounts to 805 Mm. 3 use emulation technology to study report machines treatment of mechanism electric spark to involve a variety of complex theory, build perfect theoretical model hard, additional, because electric treatment process is extremely medium,the clearance between has a few micron only commonly, extremely the method observation that the discharge condition between uses convention hard, the research that also machines mechanism for report brought difficulty. The computer emulates a technology to perhaps can understand discharge mechanism in order to help us. Can go up in the foundation of existing understanding, build an emulation model, recycle should emulate a model to study voltaic weaveform, arteries and veins pair of treatment efficiency such as frequency of wide, pulse and electrode material and the influence that machine function, perhaps study other element is right the influence that machines function. The emulation technology success application in many sided and its initial application in WEDM and EDM domain expresses the effective tool that understanding it is research EDM mechanism, can use inside the many domains that EDM machines. According to current recognition level, the essence that thinks electric spark is machined commonly depends on heating up action. The basic theory that conducts according to heat and the actual condition that electric spark machines, through certain hypothesis, the heat of attainable electrode conducts a model to be: In type: α is thermal diffusion coefficient, α (T) is heat source radius, t0 is initiative temperature. If assume discharge passageway radius keeps changeless, the temperature field that gets deciding radius face heat source according to heating up law of the heat source in conducting theory distributings for: In type: Q is hot density. Get arteries and veins accordingly wide if the relation with opposite electrode loss pursues 4 are shown. Graph 4 arteries and veins are wide the relation 　 Utsumi with opposite electrode loss [11] think discharge of vacuum electric arc falls, the temperature that cathode discharge nods is the boiling point Tb of cathode material, OK the metabolic formula that the type on the basis gets discharge passageway radius is: The relation between time of the discharge when getting copper machines iron from this and heat source radius is shown 5 times like the graph. Graph the relation 　 G between 5 discharge time and heat source radius.

Spur [12] the metabolic case that passageway radius leaves in action of triangular electric current when waiting for a person to study WEDM is machined, calculated with finite and unit law discharge mark the ratio of pit-depth to pit-diameter of mark of radius, discharge and arteries and veins the relation between intensity of wide, electric current, the fall that concludes electric current should be reduced as far as possible in thinking to be designed in the following power source along, because such ability are helpful for raising the utilization rate of pulse, also be helpful for raising treatment rate. The Chu Zhenbin of our country ever also was opposite 1978 the transmission model that decides radius face heat source made research, qualitative ground and thick mensurable ground explained the condition that small loss machines. For small loss treatment laid theoretical foundation. Can say, the research of the hot transmission model that machines to electric spark already obtained certain result. But afore-mentioned each models were made in the course that seeks solution simplify in great quantities, when using analytic law to seek solution temperature field especially, do simplify more, some is endless even and reasonable. As computer standard rise ceaselessly, the computer is more and more powerful also to the ability seeking solution of all sorts of complex models. Functions of all sorts of symbolic computation software are stronger and stronger, can consider to making the case that simplifies lesser, seek solution temperature field. Usable also more and more perfect now finite yuan analytic software is in fewer numeric imitate undertakes below simplifying condition, get the distributinging case of temperature field. In the meantime, the analysis in front basically is the temperature field when rectangular wave in the light of power source weaveform, when voltaic intensity changes along with time and changing, afore-mentioned analysises that do all do not suit for the most part. We will be used finite yuan analytic law will study twinkling heated sheds density, twinkling to change the heat of face heat source of radius transmits a model, the design of pulse power source reachs small loss to machine after the hope can be right even treatment of electric spark milling provides academic support. Emulation technology can be used at studying heat transmits a model not only, there ever also had been successful application on the research of means pouring oil. The person such as Masuzawa emulated the distributinging circumstance in child of corrode of the report below different kind pouring oil, conclude think: Shift wants excel static state to pour oil to oil, developed oily law to realize the lens face treatment of workpiece with shift. The characteristic that the article machines according to electric spark mixes 4 conclusion emulation technology builds a model in the system, forecast optimize the advantage that waits for a respect, built electric spark to machine craft to forecast, optimize a system. Use what this system undertakes to forecast make clear, forecast an error to be in basically 10 % less than, demonstrative system model is true the craft pattern that reflected this machine tool, can use what this system has craft effect completely to forecast optimize with what machine parameter, the intelligence that processes a system for electric spark thereby changes direction to lay next foundations. At the same time we still used this system to have the research of craft rule, discovered the craft law that cut of big ply line machines, namely when cut of big ply line is machined, must want to have tall peak value electricity, according to this rule, cut of our success ground the work with deep 805 Mm. We still use the heat that emulation technology machines to electric spark to transmitted a model to develop research, obtained abecedarian positive result. Anyhow, emulation technology machines speed to build speed of model, treatment and exterior surface roughness in electric spark forecast, those who machine parameter optimize, the mechanism research that electric spark machines if character of wide, material is opposite peak value electric current, arteries and veins the theoretical analysis that processability can affect and voltaic weaveform are opposite processability. Lay next good foundations to develop system of electric spark artificial intelligence later. CNC Milling