Model electric spark of face of antrum model lens machines discuss

The electric spark of 2 Um is machined, treatment surface has lens face to glance the effect. Degenerative layer ply of the surface is even, seldom have micro-crack, have taller wearability and be able to bear or endure corrode sex, the surface need not polishing. Treatment of lens face electric spark basically applies at mixed pattern antrum, do not facilitate the nicety of the complex curved surface that undertakes polishing works is machined especially, can working procedure of polish of leave out handiwork, the performance characteristics that raises a part (wait like sex of life, wearability, drawing of patterns) , to reducing labor intensity of the worker, shorten the mould makes cycle, have real sense. 2 model electric spark of face of antrum model lens machines discuss a basis to machine experience actually, the crucial technique that processes to electric spark of face of lens of nicety antrum model undertakes discussing. 2.

Machine tool of 1 electric spark should have circuit of lens face finish machining to want to realize lens face treatment successfully, the most crucial factor is electric spark machine tool should have 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, solve treatment speed loss of slow, electrode is big with narrow the craft with wide arteries and veins is contradictory. Resemble asking machine tool of tall numerical control electric spark developed superfinishing circuit at present, easily treatment gives Ra<0 of exterior surface roughness.

The lens side effect of M of 1 μ (the lens face that bedding face of be confined to accumulates 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, unwarrantable book treatment effect reliably, because this cannot use Yu Jing commonly,the face is machined. Visible, choosing high-powered discharge machine tool is the premise condition that realizes lens face treatment. 2.

2 applying the technology that mix pink to improve lens face to machine the effect to mix powdery electric spark to machine is a kind of improvement the advanced technique of surface roughness of surface of electric spark treatment, treatment of the alleged electric spark that mix pink is to point to small pink was added in working fluid, the pink that be like silicon, aluminium powder, chromic pink and concerned additive, with period make machine the surface to achieve lens side effect. Use the processing technique that mix pink, can fall in similar electric parameter requirement, rapidder than using the processing technique that mix pink to obtain treatment rate (make finish machining time shortens 20%-30% ) and more the exterior surface roughness of actor. To the electric spark treatment of larger area, have marked improvement action. Mix pink at present processing technique is 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 mould course of study. The principle that the electric spark that mix pink machines is: Because the interfuse in working medium is certain 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. The pulverous additive that treatment of the electric spark that mix pink asks the choice is right and device of loop of fluid of the job that mix pink, have the chroma government of pulverous additive, use enlarge bulk buy to eliminate pH indicator error. 2.

3 much electrode change the controls electric spark treatment process of figuration craft and material surplus is one arrives from rough machining the treatment process of finish machining. Treatment of lens face electric spark uses the technique that much electrode changes. Discharge according to machining place to be in thick, half essence, finish machining the characteristic with different clearance uses a few relevant measure to shrink the electrode of to the limit of one's capacity finishs model the thick, half essence of antrum, finish machining. 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; Change semifinishing machining electrode again next, use what put electric energy lesserly to finish rough machining to finish machining to transfer treatment, reach tall treatment precision and exterior mass; Use finish machining electrode finally, use very small discharge energy to undertake lens face is machined. Much electrode changes in, should notice to control the loss circumstance of good electrode, the requirement is after course rough machining and semifinishing machining, assure model antrum achieves treatment dimension, appearance basically to ask, undertake with an electrode final lens area is machined only. Each working procedure before lens face is machined, all want to consider material surplus for the treatment from the back. Choosing surplus of the material between reasonable working procedure is the key that assures to machine quality and treatment efficiency. Larger material surplus can lower treatment rate. Lesser material surplus can affect the exterior surface roughness of treatment. 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, press the material surplus of every condition namely 0 treat. But when be being machined actually, restrict an element considering what discharge state gets Protean, because this wants to consider material surplus for safety, the size of surplus can be decided according to actual discharge state, stabler to those discharge, treatment status compares good case, can reduce material surplus appropriately, in order to raise treatment rate. Nextpage2.

The electric spark of face of electric rule accurate lens that face of lens of 4 reasonable configuration machines machines the general principle that electric rule configures definitely: Advocate parameter chooses small peak value electric current, small pulse width, bigger pulse gap. What peak value electric current chooses is smaller, pulse width is smaller, pulse gap is bigger, treatment surface surface roughness is worth smaller. Choose very small peak value electric current, often affected treatment efficiency greatly, in mixing pink to machine accordingly, it is below the premise that asks in surface roughness of contented and particular face improve efficiency, should choose bigger peak value electric current and lesser pulse width. What differ with groovy treatment is to be below wide condition of small arteries and veins, treatment of the electric spark that mix pink can produce taller treatment efficiency, because mix powdery job fluid to make puncture discharge becomes easy, in small arteries and veins wide condition falls to also can produce puncture discharge, reduce pulse width, can make the discharge number inside unit time increases, make machine efficiency to maintain higher level. Treatment of lens face electric spark should use negative pole sex to machine, conduce to the exterior surface roughness with be obtained better be worth. Additional, in treatment of lens face electric spark, a few options that are not main report parameter are likewise special and important, the choice that machines with convention also exists a few differences, should set like discharge time some longer, carry knife height is some shorter, carry knife speed cannot too fast, the purpose of such settings is to maintain the course of corrode of small energy report of a stability, because be in lens face treatment, itself won't produce a lot of electric corrode product, cross what knife movement can disturb discharge instead to carry frequently stabilize continuously undertake. Commonly intelligence changes at present the electric rule of machine tool of advanced numerical control electric spark 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 sets each paragraphs material surplus. The electric plan that means of this kind of intelligence chooses can satisfy treatment requirement commonly definitely, the operation is simple, avoided to machine the factitious interpose in the process. The project that notices is the input when retrieving treatment condition wants accurate, if be put in the difference with actual condition, will affect the treatment result that retrieves electric parameter, like the treatment area ratio of the input actual area slants old saying, coarse value meets the surface after treatment be worth a little bit big than the requirement. 2.

In the process that the 5 success that use jolty treatment method to make sure lens face is machined machine in lens face electric spark, because discharge energy is very small, the effect that discharge bits is not ideal, spark more easily the circumstance that local concentration discharges, make treatment cannot be stabilized undertake. To increase the stability of treatment, can use jolty treatment. Below stable discharge condition, can obtain the exterior surface roughness with flank and evener underside, easier control machines dimension. In the treatment that having complex figure especially, use jolty treatment method to be able to increase the stability of treatment significantly, because this is in treatment,be used extensively. The jolty function of new development of machine tool of electric spark of a few numerical control, can make electrode machines appearance to be in ceaselessly along the target jolty in treatment, eliminated the backwater of electrode, can achieve the uniform treatment appearance that does not have weaveform and hemp hole. 2.

The demand of electrode of 6 pairs of tools and workpiece is main to the requirement of electrode include exterior surface roughness, material, shrink put the aspect such as dimension, precision. 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, so lens face machines used electrode to must undertake essence of life repairs polishing, in order to achieve Gao Guangjie's appearance. But the appearance that does not request electrode should achieve lens face to ask, general surface surface roughness should achieve Ra0 only.

Left and right sides of 3 μ M is OK, can show this issue according to machining experience: The electrode after polishing is after lens face treatment, electrode shows wine, slightly rough surface, and workpiece shows lens face result. The electrode data that with Yu Jing the face processes must conductivity admirable, quality of a material is even, have the characteristic such as discharge stability. Processability of electrode of tungsten of pure copper, copper can be very good, produce electric arc not easily to discharge or transfer electric arc discharge, face of can contented lens machines a requirement. Black lead electrode flakes easily in finish machining, easy generation discharge does not stabilize a phenomenon, need not regard lens face as the electrode material of treatment commonly. Of tool electrode shrink the volume that put dimension to decide jolty capacity, also decide treatment chooses electric rule to permit the bulk of energy, immediate impact machines the technology index such as precision of speed, profile modeling. The size of electrode of treatment of general lens face shrinks to the limit of one's capacity takes odd side 0.

2 ～ 0.

05 Mm, in treatment the area compares Xiaoshi desirable a few smaller, when demand of profile modeling precision is high desirable a few smaller, take appropriately when the treatment that mix pink a few bigger. Because lens face treatment uses much electrode,change figuration craft, the consistency that this is about to beg many electrode is close friends, production precision wants tall, change the repetition of electrode installs precision of clip, fixed position to want tall. Can use high speed mill to create the demand of the electrode, location method that uses fiducial ball to measure, electrode in using fast outfit to place location system to undertake advanced technology will satisfy lens face to machine repetition locating waiting. The effect basis that lens face machines of workpiece material different and different, ask to having lens side model antrum model, the material that should choose to machine lens face easily regards workpiece as material, commonly used lens face machines material to have: The import rolled steel such as SKD61, NAK80, STAVAX, the electric corrode performance of these material is very superior. 2.

The electric corrode ability that the face of lens of skill of a few operations in treatment of 7 lens face machines electric rule to allow is very weak, treatment process needs to spend very long time. The dimension change when be being machined as a result of lens face is already minor, have the effect that repair light only, the surface that should machine a requirement only actually can end treatment after surface roughness, because this can use the time treatment function of machine tool of numerical control electric spark (G86 dictates) , will decide to machine how long according to experience. If lens face is machined model antrum is regular whirl appearance, if machine tool configuration has C axis, so use the clamping apparatus with tool electrode and C homocentric axis (like clamping apparatus of EROWA, 3R) , add man-hour to make C axis makes whirligig, can obtain very stable treatment, ameliorable surface surface roughness. But rotate speed of axis of the C in lens face treatment cannot too fast, can bring about treatment process stability otherwise hasten is bad, remove arc phenomenon aggravate, make the value increases exterior surface roughness instead. The processing way of fluid of the job when lens face is machined is very important also, can add the flanker juice of proper pressure on the foundation of oiled treatment commonly, make the working fluid that machines place is in slight circular condition. Do not use intense strong liquid absolutely, erode strongly form what action can violate small discharge process normally. The basis machines experience discovery, should machine each link only processing is proper, won't produce the phenomenon that accumulate carbon commonly in lens face treatment, because this is in treatment process,should stop less as far as possible machine, the layer of powdery Chinese ink that will not save in workpiece to machine the surface especially clears, because layer of powdery Chinese ink can make tool electrode and workpiece machine the parasitism between the area, go cloth capacitance decreases, make discharge energy distributings equably. 3 last words create the higher demand that raise to the mould as the market, treatment of lens face electric spark will make a kind of when nicety antrum moulding builds indispensable technology. Model electric spark of face of antrum model lens machines discuss, provide referenced function to popularizing the application of this one technology. CNC Milling