Ajixiamier mixes treatment of powdery electric spark to be in model the application in antrum model

The even surface of 4 Um. In common scintilla oil (without mix pink) when having electric spark precision work, should machine when the area is larger, larger parasitism electric capacity can be formed between workpiece and electrode, generation centers discharge phenomenon, manufacturing efficiency is extremely low, exterior surface roughness achieves treatment requirement hard, accordingly, before complex model of antrum model inferior the treatment requirement that light asks the face cannot achieve even appearance, smooth full treatment basically relies on manual polish. The malpractice that mixes treatment of powdery electric spark to be based on afore-mentioned finish machining to exist just about and a technology of development. Its distinct advantage is: Treatment efficiency is tall, finish machining time shortens substantially, improved the manufacturing efficiency that the mould manufactures; Exterior uniformity is good, improved the even rate that finish machining bedding face accumulates substantially, improved mould surface quality; To the treatment of large area, can achieve likewise under Ra0.

The exterior surface roughness under 4um, satisfied the high demand of die manufacturer. Mix processing technique of powdery electric spark at present already commercial, with application of form a complete set of machine tool of figuration of electric spark of a few numerical control, get the favour of die manufacturer. The 2 electric spark that mix pink machine those who use a technology to discuss those who be based on machine tool of electric spark of numerical control of SA of product of blue line of Er of GF A Jixia rice to mix pink to process the application of practice, the basis machines experience actually, the crucial technique that processes application to mixing powdery electric spark undertakes discussing. 2.

The alleged electric spark that mix pink machines the brief principle that the 1 electric spark that mix pink machines is to point to small pink was added in working fluid (the pink that be like silicon) , process of treatment of whole electric spark has powder of certain pH indicator in this kind undertake in working fluid. Because the interfuse in working fluid medium is certain,the electric spark that mix pink is machined proportional conductivity or half conductivity exceeds fine pink not, when discharge extremely span leaves increase, make the parasitism capacitance between workpiece and electrode decreases quickly, ruinous parasitism capacitance discharge appears no longer, form electric spark discharge easily, the discharge clearance that groovier electric spark processes greatens, can prevent effectively to center discharge happening, make discharge arises equably in treatment surface, hole of corresponding discharge corrode distributings equably in treatment surface, form big and shallow discharge corrode hole. Dish of shape indentation surface of mutual jackknife, want level than common discharge surface, the chaos that reduced light is reflexed and form flashy lens surface easily. 2.

Treatment of the 2 electric spark that mix pink wants to execute treatment of the electric spark that mix pink successfully to the requirement of the machine tool, have corresponding demand to machine tool of numerical control electric spark. 1) because powder was added in working fluid, ask electric spark machine tool has the unit that prevents pulverous precipitation above all. Machine tool of electric spark of numerical control of SA of product of blue line of Er of rice of GF A strange summer is working the workbench of fluid chamfer all around installed circuit conduit, distributing equably on conduit have alveolus; Same, how is the conduit of aperture also contained of circuit in gasoline tank; Use high-power oil pump, when high-power oil pump works, working fluid the alveolus from conduit is ejective, to working fluid chamfer supply mixes powdery job juice, the liquid that makes working fluid chamfer medium at the same time flows circularly ceaselessly, prevent pulverous precipitation, on the other hand, oil pump gives the conduit supply in gasoline tank to mix powdery job juice likewise, working fluid the alveolus from conduit is ejective, the liquid that makes gasoline tank medium flows circularly ceaselessly, prevent pulverous precipitation. 2) machine tool of requirement electric spark has circuit of lens face finish machining, the individual pulse energy that asks the pulse power source of the machine tool has minimum namely (the power source of electric current of width of pulse of accept second class, low peak value) , can undertake below small discharge energy stable discharge is machined. A few common model although the pulse power source of electric spark machine tool has small individual pulse energy, but the abidance that it cannot satisfy lens face to machine stabilizes discharge, although can pass the craft that mix pink to improve its discharge stability, but unwarrantable still book treatment effect reliably. High-powered pulse power source not only can improve treatment efficiency, still can reduce surface roughness of electrode loss, surface. Machine tool of electric spark of numerical control of SA of product of blue line of Er of rice of GF A strange summer uses the ISOPULSE of energy pulse power source such as Swiss A Ji. 3) machine tool of requirement electric spark has rich applied function. If can weave neatly machine program, the dimensional translation kind that has the electric spark that mix pink to machine a requirement (see next detailed introductions) . Visible, choosing machine tool of reliable electric spark of the numerical control that mix pink is the premise condition that realizes treatment of the electric spark that mix pink successfully. 2.

Before the 3 electric spark that mix pink machine process to undertake electric spark is machined mixing pink, want to undertake craft is analysed above all, whether does judgement antrum suit to use treatment of the electric spark that mix pink. Treatment of the electric spark that mix pink basically is the Gao Guangjie that accumulates in the light of bedding face spend treatment. To model of great majority antrum, wait like mould of mould of mobile phone crust, remote controller crust, treatment of the electric spark that mix pink can serve as model the final treatment of antrum surface. Even if the three-dimensional curved surface that high speed mill machines, because of the slick surface with gotten successive dispute, reason still needs to use electric spark to undertake finish machining gets smooth treatment area. To imperceptible model antrum, because the treatment that mix pink exists pulverously in working fluid, discharge gap is big and come true hard a few careful clear part requirement, if the exact size of IC model asks, the treatment that mix pink is apparently improper. Before undertaking electric spark is machined mixing pink, model antrum must be passed beforehand mill treatment, stay have appropriate mental allowance. The process that electric spark machines arrives from rough machining namely the process of finish machining. Use the technique that much electrode changes, with 2 different measurement shrinks the electrode of to the limit of one's capacity finishs model the thick, finish machining of antrum. Use rough machining electrode above all, fall in the condition that assures to machine quality certainly () of surface roughness of dimension precision, appearance precision, position precision, surface, use bigger discharge energy corrode to divide a large number of metals, in order to shorten handling time, improve treatment efficiency. (to model the rough machining of antrum, the requirement is in blame undertake machining below the condition that confuses pink, otherwise the corrode in rough machining is divided come down bulky material grain and powder mix, the influence machines the effect) ; Use finish machining electrode to undertake electric spark is machined mixing pink next, reach the treatment precision of the requirement and exterior mass. Before the electric spark that mix pink is machined, want to control the dimension of good rough machining strictly. If the treatment amount of rough machining obligate is too small, so the treatment that mix pink will cannot repair completely on, affect exterior result; If the treatment capacity of rough machining obligate is too much, so the treatment that mix pink spends very difficult purify much material amount, bring about treatment rate is extremely slow, electrode exhaustion. Surface of proposal rough machining antrum achieves VDI25 (Ra1.

8um) class, underside obligate 0.

07mm, flank unilateral obligate 0.

08mm. In mixing powdery electric spark to machine a process, often can hold the discharge position of tall stability, won't produce the phenomenon that accumulate carbon commonly, because this is in treatment process,should stop less as far as possible machine, the pulverous layer that will not save in workpiece to machine the surface especially clears, lest violate normal discharge procedure. Treatment of the electric spark that mix pink needs to had controlled each segment, in order to seek the successful rate of treatment, if because detail handles undeserved generation,subtle blemish will be brought about,relapse nap, often spend multiple time. 2.

The fluid of job of requirement electric spark that the 4 electric spark that mix pink machine pair of job fluid and powder is having the disappear ionization, cooling, effect that excludes electric corrode result in machining a process. To the liquid of electric spark job that finish machining uses, requirement viscosity is low, in order to assure electrode slaggy have clean function goodly; Of working fluid fight oxidation function and thermal stability very crucial also, decide the service life that oil savors. Machine tool of electric spark of numerical control of SA of product of blue line of Er of rice of GF A strange summer mixes pink to machine a proposal to deserve to use electric spark oily TOTAL EDM 3 (French path amounts to Er, viscosity 20 ° C: 6.

7 Mm2/s (cST) , flash point O.

C: > 135 ° C) . Nextpage mixes powdery electric spark to machine the powder that joins in working fluid at present, according to the technology of the domestic and international numerous treatment that mix pink the report has silicon pink, aluminium powder, magnesian pink, black lead white basically a few kinds. The special solution mixing pink that the group studies the pulverous Jixiamier is A that SA20 uses, its composition basically is black lead grain, roughly length is less than 8um, the chroma that powder adds asks to be 2g/L. Every time changes the need before the fluid that mix pink filters, clean scintilla is oily, filter the powder of the ort in machining a process and invalidation rejoin mixes powdery solution. Requirement of this solution that mix pink had better be being machined 350 or change after 400 hours. The treatment that mix pink will precipitate in the inside of working slot black slop, experience proof cannot have these slop and scintilla oil mixture again, because it is met,severe double image rings to machine function. The chroma of fluid of the job that mix pink has bigger effect to machining exterior effect. When the chroma of the fluid that mix pink is insufficient, the exterior result of the requirement cannot be achieved inside shorter time, reduced treatment efficiency. In the circumstance that requirement lens face machines, because the meeting mixes powdery chroma insufficient and cause exterior burnish effect poorer; When the chroma that mix pink is too big, model the edges and corners side the acute of antrum can be destroyed, reduced treatment precision. Between electrode and workpiece the existence as a result of more powder, powder builds the bridge to bring about short circuit of going from place to place with respect to meeting generation, serious when bruise can arise in workpiece surface. In mixing powdery electric spark to machine a process, the working fluid in box of working fluid chamfer is in circular condition, do not suggest reuse is machined to fluid, cannot use intense strong liquid especially, in will creating discharge process otherwise, flow inhomogenously, affect the uniformity of exterior effect. 2.

The 5 electric spark that mix pink machine the configuration of parameter to mix powdery electric spark to machine the configuration of parameter to include: Use electric plan is standard, wait like clearance of width of electric current, pulse, pulse; The discharge clearance value with exact rule of every archives phone and obligate are measured. Treatment of the electric spark that mix pink must make sure rule of each archives phone allows discharge to be able to be stabilized undertake, final rule can achieve the exterior result of the requirement definitely. Many gauge are accurate in electric current is ordinal decrease, pulse width is ordinal decrease, reelection compounds corresponding pulse clearance, servo gap. Be in normally VDI18 class (Ra0.

8um) gauge is accurate sex of the following use negative pole machines parameter (electrode is negative pole) . The discharge energy with each archives accurate gauge is reduced gradually, progressively Xiu Guanglai achieves the exterior surface roughness of the requirement. Be worth what carry is, treatment of the electric spark that mix pink can produce taller treatment efficiency, fluid of more average job can choose bigger discharge energy to obtain same exterior surface roughness. Additional, there is quite good discharge stability in treatment of the electric spark that mix pink, discharge time should be set some longer, carry knife height is some shorter, the purpose of such settings is to maintain the course of corrode of small energy report of a stability, the choice that machines with convention is discriminating. [The discharge clearance value that 1] mixes powdery electric spark to machine need to calculate what each phone rule allows accurately and obligate are measured. Minor material obligate volume can affect the exterior surface roughness of treatment, bring about long not only. Optimal treatment state is the first condition after treatment is over, ever since treatment is Xiu Guangdi only the surface that condition of a treatment forms is rough degree, and do not destroy new material. But when be being machined actually, restrict an element considering what discharge state gets Protean, because this should consider safe obligate amount. The size of surplus can be decided according to actual discharge state, bigger to the area, treatment status compares good case, can reduce material surplus appropriately, in order to raise treatment rate. Commonly intelligence changes at present the electric rule of machine tool of electric spark of advanced numerical control deploys a method definitely. The machine tool has the treatment parameter of a lot of whole set, it is the optimal parameter combination that obtains through much craft experimentation, can machine a condition according to machining a requirement to retrieve, if input treatment,size of taper of appearance of area, treatment, electrode, electrode shrinks surface roughness of to the limit of one's capacity, jolty means and treatment surface is worth etc, the machine tool can configure an optimum electric plan to allow, it uses treatment process component Duan Jin of many treatment condition to be machined all right, chase paragraph reduce electric corrode capacity, intelligence installs the obligate with each accurate gauge to measure. The electric plan that means of this kind of intelligence chooses can satisfy treatment requirement commonly definitely, the operation is simple, but normally the means of automation is premise in order to assure treatment character, because this is machining effect,meet on rate inferior. In actual production, answer to accumulate experience ceaselessly according to reduplicative treatment, optimize treatment process. 2.

The requirement that the 6 electric spark that mix pink machine pair of translation functions to model the treatment of the electric spark that mix pink of antrum model, need to achieve the dimension precision of the requirement, requirement underside and flank surface result are additionally same, this must have function of numerical control translation with respect to machine tool of demand numerical control. Electric spark machined a machine tool to have function of numerical control translation, the control to dimension precision is easier. But the exterior result that should make sure underside and flank agree equably, have the translation function that accords with a requirement with respect to requirement machine tool. In the process that the electric spark that mix pink machines, the smooth momentum that asks each gauge is accurate can change at the same time along with deepness, namely deepness is increased stage by stage, make the same score momentum to also be increased subsequently, underside and flank are in the means of 3 axes linkage of synchronous treatment. Below means of this kind of translation, can realize time treatment function at the same time, can appoint the handling time with each exact plan namely, inside designation handling time, the exterior result that underside and flank achieve is consistent. If GF A is strange,machine tool of electric spark of numerical control of SA of product of blue line of summerly rice Er is in the requirement when the electric spark that mix pink is machined chooses dimensional translation circle. Means of this kind of translation is in the finish machining of small energy, increased the stability of treatment significantly, the exterior result that can achieve flank and underside is consistent. Certain translation function is inapplicable in treatment of the electric spark that mix pink, be like the circular servo translation of SA machine tool, the movement that this translation means carries out is, rule of every archives phone must finish treatment deepness first definitely, carry out a circumferential translation contrail again, apparent means of this kind of translation is in model the finish machining phase that antrum model mixes pink to machine does not suit. 2.

The requirement that treatment of the 7 electric spark that mix pink mixes powdery electric spark to machine pair of electrode to the requirement of electrode basically includes surface roughness of material, surface, shrink put the aspect such as dimension, precision. The red copper that treatment of the electric spark that mix pink asks use purity is taller regards electrode as material (be like 3 treasure red metal of Japanese) , its processability can be very good, produce electric arc not easily to discharge or transfer electric arc discharge, can gain the treatment face that agrees equably. Black lead electrode is in average job fluid (without mix pink) the performance in finish machining is poorer, but in the treatment that mix pink, because powder was added in working fluid, gap of finish machining discharge is bigger, through actual test and verify, black lead electrode also can realize treatment of lens face electric spark in treatment of the electric spark that mix pink. Those who be worth a specification is, if model antrum asks to undertake lens face is machined mixing powdery electric spark, must raise strict requirement to the character of electrode material, machine the effect to be affected otherwise, the appearance of lens side effect that the purity of material of red copper electrode that for example uses can cause treatment not quite is possible local defect, inhomogenous wait for undesirable phenomenon. The appearance that the process that electric spark machines is an electrode duplicates to go up to workpiece. From this knowable, electrode surface surface roughness decided on certain level treatment gives the exterior surface roughness of workpiece, the electrode that so lens face treatment uses must undertake essence of life repairs polishing (the essence that should pass 1000# sand paper at least is cast) , in order to reach the mass of surface of electric spark treatment that Gao Guangjie spends. Of electrode shrink the size of the volume that put dimension to decide electric spark machines compasses of first gear to allow energy and translation extent, immediate impact machines the technology index such as precision of speed, profile modeling. The size of electrode of finish machining of the general electric spark that mix pink shrinks to the limit of one's capacity takes odd side 0.

07 ～ 0.

15 Mm, treatment area hour is desirable a few smaller, when demand of profile modeling precision is high desirable a few smaller. Treatment of the electric spark that mix pink has electrode of thick, finish machining, this is close friends with respect to the consistency of requirement electrode, production precision wants tall, change the repetition of electrode installs precision of clip, fixed position to want tall. Can use high speed mill to produce the electrode, location method that uses fiducial ball to measure, use fast outfit to place location system to undertake advanced technology will satisfy high demand repetition locating waiting. 2.

The treatment effect that treatment of the 8 electric spark that mix pink mixes powdery electric spark to because the different meeting generation of workpiece material is different,be machined to the requirement of workpiece material. Machining grain face (VDI18 stage appearance / Ra0.

8um above) when the exterior effect difference that different material obtains is not apparent, but machining lens face (VDI7 stage appearance / Ra0.

2um is the following) when those who because workpiece material is characteristic,meet is different acquisition exterior result has bigger difference. Some material can achieve favorable lens side effect, if commonly used lens face machines material to have: The import rolled steel such as S136, SKD61, NAK80; Some material cannot achieve lens side effect however, like SKD11 (be equivalent to Cr12MoV) . Can think following case is the cause that workpiece material affects lens face to machine the effect character: The composition that contain silicon is helpful for achieving better lens side effect; The thick unripe carbide that contains big means or accretion of bulky crystal grain are adverse to machining lens face, generation shows micro-crack; Contain the sulfur that cuts part quickly adverse to machining lens face, produce exterior stripe; The embryo such as material rolling direction expects workmanship element is adverse to machining lens face, produce exterior stripe; The element such as metallic field trash, bleb, oxide forms stythe eye of a needle and hole; The hardness of workpiece steel is tall, the effect of face of lens of electric spark treatment is good. The workpiece material that face of general requirement lens processes pledges heat treatment temper by dipping in water comes forcedly HRC>50. [2] 2.

The control of the controls finish machining of the electric spark that mix pink efficiency of efficiency of treatment of the 9 electric spark that mix pink decides at a few respects: The treatment efficiency with stronger accurate gauge basically decides VDI22 above to allow the obligate between to measure at each archives compasses, if obligate amount is equal, fall definitely in the electric plan that has certain corrode to eliminate ability, machining efficiency is taller; VDI22 and the following weaker electric rule is standard, as a result of each phone rule accurate electric corrode ability loses, the dimension change when treatment is already minor, have the effect that repair light basically only, if carry out treatment strictly according to designation size, treatment process needs to spend very long time. And treatment can end after wanting to machine the exterior surface roughness of the requirement only actually, because this can use the time treatment of machine tool of numerical control electric spark,the function controls treatment efficiency. The area that machines according to discharge comes the Xiuguang time that each paragraphs of place needs set. 3 last words ask higher to making what the technology puts forward as mould industry, treatment of the electric spark that mix pink will become large area complex model a kind of when antrum moulding builds vital engineering technology. The research that the electric spark that mix pink machines is discussed, the promotion that uses a technology to this provides referenced function. CNC Milling CNC Machining