High speed walks along a cut of electric spark line to machine demonstration of solution of fracture of wire

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Summary: The article sets out from actual production, walk along a cut of electric spark line to machine the analysis that the main reason of fracture of wire undertakes to high speed, offerred the program that settle, finally the angle from a case of a physically strong patient running a high fever or suffering from such disorders as stasis of blood, the demonstration of the simple trouble removal that has to phenomenon of the fracture of wire in production studies. Keyword: High speed walks along silk; Cut of electric spark line is machined; Phenomenon of fracture of wire; Reason; Countermeasure; Cut of electric spark line of 　 of analysis of a case of a physically strong patient running a high fever or suffering from such disorders as stasis of blood is machined (Wire Cut Electrical Discharge Machining, abbreviation WEDM) , call a line cut again sometimes. Its work basically the principle is the fine wire that uses successive shift (call electrode silk) make electrode, undertake to workpiece corrode of pulse scintilla discharge shapes except metal, cut. Machine of cut of electric spark line can be divided by speed walking along silk take a chance of cut of electric spark line for high speed move back and forth, common express one's gratification walks along silk; Low speed is one-way take a chance of cut of electric spark line, common says silk of don't go yet and vertical spin turn machine of cut of electric spark line 3 kinds. Can divide into Chan Lizhu by workbench form again crossed workbench with double pillar model (common calls dragon the door) . Cut of 1 electric spark line machines cut of principle 　 electric spark line to belong to report to machine a category, be by before when Russia pulls couple of Za Lin division to study switch contact suffers scintilla discharge to corrode the phenomenon of attaint and reason, the instantaneous high temperature that discovers electric spark can make local metal fused, oxidize and be corroded, be initiated thereby and invented electric spark to machine a method. Line cut machine also was invented 1960 at before Russia, our country is the first country that is used at industrial production. Treatment of cut of electric spark line basically is used at the mould to make, increasingly wide application also receives in the treatment in accurate and cutting tool of example, cam, figuration, tiny part and special material. Its job principle is: Free ion and electron are attendant in accumulate, form very quickly by the electric passageway of ionization. In this phase, two board form electric current. Bring about collision happens countless times between particle, form a plasma division, lift very quickly the high temperature of ℃ of ~12 000 of 8 000 ℃ , fuse in instant of two conductor surface a few material, in the meantime, as a result of the vaporization of electrode and electric interpose fluid, form a bleb, and its pressure regulation rises until very tall. Next electric current is interrupted, temperature is reduced suddenly, cause bleb introversion to explode, the motivation of generation tosses dissolved material a crater, the material that is corroded next condenses into small sphere afresh in electric interpose fluid, be discharged by electric interpose fluid. Accuse through NC pilot is monitored and be in charge of next, servo orgnaization is carried out, make phenomenon of this kind of discharge agrees equably, achieve treatment content to be machined thereby, the made product that makes the dimension size accord with the requirement and appearance precision. When cut is machined, workpiece installation is on workbench, workbench is mixed by X axis normally drive of Y axis electromotor. Tool electrode (electrode silk) for the diameter 0.

02mm~0.

The tinsel of 3mm, drive electrode silk to move along its axial by system walking along silk. Means walking along silk has two kinds: 1) high speed walks along silk, speed is 9m/s~10m/s, use molybdenum silk to make electrode silk, can use repeatedly circularly; 2) low speed walks along silk, speed is less than 10m/min, electrode silk uses cupreous silk, use only. Pulse power source is added between workpiece and electrode silk, general work receives positive electrode, electrode silk receives negative pole. Working fluid is entered with nozzle gush between workpiece and electrode silk (emulsion, go the) such as ionic water. Control system exports relevant information according to the working program that inputs beforehand, make workbench makes corresponding shift, workpiece and electrode silk are stood by. When both and adjacent when arriving to be apart from appropriately (it is commonly 0.

01mm~0.

04mm) produces scintilla to discharge, corrode divides a metal. The distance between the workpiece after the metal is divided by corrode and electrode silk is increased, control the size that the system is apart from according to this and the process that input beforehand, issue feed signal ceaselessly, make treatment process undertakes continuously. Engine of cut of electric spark line of 　 of machine of cut of 2 electric spark is main. Use computer to control a system, complete Chinese is automatic software of plot process designing, control. There is orbit, time to show in treatment, silk can go to have cut function characteristic for many times to be told normally in understanding treatment circumstance at any time, the main function of machine of electric spark cut has: Have function of plot, process designing; Mirror, symmetrical, rotate, translation function; Automatic processing, treatment ends short circuit to stop machine function automatically; Retrorse treatment, aleatoric paragraph of treatment function; Scale shrinks put a function; Break cable to protect a function; Look for central function automatically; Man-machine interaction function. 3 fracture of wire are main reason 　 　 3.

The 　 of 1 fracture of wire related to electric parameter choice and pulse power source generally speaking, the machine rate of fracture of wire increases as what put electric energy and increase. Because machine medium pulse energy to rely on electrode silk to deliver,this is, if electrode silk current-carrying capacity is too large when, the tensile strength that calorific meeting makes it inherent reduces the resistance of itself a lot of, cause fracture of wire very easily so. Can set pulse clearance parameter a little bit big, in order to be helpful for the eduction of fused metal particle. At the same time peak value electric current and sky carry voltage to should not be exorbitant, easy generation discharges centrally and pull arc otherwise. Because electric arc discharge is to cause electrode silk (negative pole) the main factor that corrodes attaint, want electric arc discharge to center a paragraph at some only, can cause fracture of wire. 3.

The precision of carry silk orgnaization of the machine tools of 2 　 of fracture of wire related to carry silk orgnaization becomes poor, meet those who increase electrode silk shake, destroy the normal clearance that scintilla discharges, easy cause big electric current to center discharge, increase the chance of fracture of wire thereby. This kind of phenomenon happens in the machine tool to use time commonly the circumstance that orgnaization of silk of thicker, carry clears not easily finishs work of longer, treatment. Because this is used in the machine tool in the precision that should check carry silk orgnaization regularly, change in time easy wear away. Going up silk should carry to check electrode silk to whether shake for nothing after silk, if happen,shake should analyse a reason. 3.

The 3 material of the silk of electrode of 　 of fracture of wire related to electrode silk should be decided according to machining a circumstance, can cause fracture of wire otherwise. Take a treatment of cut of electric spark line to numerical control high speed, use molybdenum silk extensively. Because molybdenum silk is able to bear or endure loss, tensile strength tall, silk becomes not easily fragile character, not easy fracture of wire. Use tungsten filament treatment, can achieve higher treatment rate, but the silk after discharge becomes fragile, easy fracture of wire, application is less, be in commonly weak report rule is punctual use. Tungsten silk (before effect of each 50%) treatment compares tungsten, molybdenum two kinds good, service life and treatment speed compare reason molybdenum silk is tall, but the price is high. Nextpage 　 　 3.

The 　 of 4 fracture of wire related to workpiece are hit without forge, quench, the material that temper handles, the place in rolled steel contains carbide grain big, and gather into the group, and distributing inhomogenous, put in greater internal stress. If the internal stress of workpiece did not get elimination, when cut, some workpiece are met craze, touch electrode silk, some meetings make clearance is out of shape, cut seam narrow and block electrode silk. To reduce the fracture of wire that causes because of material, microtherm temper had better be used to eliminate internal stress before cut of electric spark line is machined. Should choose to forging good, temper by dipping in water shows performance quality good, heat treatment is out of shape little material, the place in rolled steel contains carbide to distributing even, make machine stability to increase thereby. If machine the Leng Chong mould that is main craft with cut of electric spark line, choose the alloy tool steel such as CrWMn, Cr12Mo, GCr15 as far as possible, should choose hot work correctly method and implement heat treatment standard strictly. 3.

After the fluid of 5 job of 　 of fracture of wire related to working fluid are being used more for long, become smudgy, integral performance becomes poor is the main reason that causes fracture of wire. The basis machines experience, the working fluid that exchanges newly works 8 hours everyday, the effect after using two days is best, continue to use 8d~10d easy fracture of wire, must change new working juice. Workpiece of tall to demand cut speed or big ply, of its job fluid deserve to compare but proper a few weaker, make an appointment with the chroma of 5%~8% , such treatment are stabler, not easy fracture of wire. The working fluid that configures with clean water is machined relatively the working fluid that tap water configures is in treatment stabler, less fracture of wire. 4 fracture of wire resolve the way to deal with a situation set out from the angle of actual production below 　 , walk along an act on one's own judgment in an emergency of cut of electric spark line with DK7725 high speed filar problem, summary high speed takes the general account of silk of act on one's own judgment in an emergency of silk thread cut, find out the specific means that reduces fracture of wire. 4.

1 choice changes molybdenum silk 　 generally speaking, the quality of molybdenum silk matters to the happening of phenomenon of fracture of wire directly, the simplest change the molybdenum silk that factory of silk of famous brand molybdenum produces. When high speed walks along machine of silk thread cut to undertake machining, generally speaking, must choose the thicker electrode silk with good quality. Be like: Debug with silk of molybdenum of Nanjing diamond card. When choosing molybdenum silk, not be bigger better, answer to undertake choosing according to using electric parameter. 4.

2 choices add workpiece 　 suitably to be in actual production, if machine workpiece quality to close nevertheless, if have two kinds of solder dot, multilayer, capable person qualitative, and when there is the foreign matter such as bleb and carbolic broken bits in material, very incidental in treatment fracture of wire. Encounter this kind of situation, the simplest way exchanges directly namely process data together. 4.

When the 　 of the parameter that use phone with 3 attune comfortable conformity is being machined, must depend on the electric parameter that according to manual basis different ply and different capable person pledge the choice suits. No matter how be machined, must adjust treatment electric current to be stabilized relatively, often also can cause fracture of wire otherwise. 4.

After 4 timely examinations may place the component part 　 of molybdenum silk to move for a long time, the influence such as channel of a few chamfer may arise to run precision on carry silk orgnaization, and the silk that send molybdenum is placed. Place should want regular examination and change in time bearing, guide pulley, electric conduction is fast, the carry silk component such as the club that block silk. Change cycle is: Bearing changes for 3 months about, guide pulley changes for half an year. 4.

5 choosing emulsion 　 emulsion meticulously is the lubricant that walks along silk to move, by cutting fluid the specification deserves to compare working fluid, can reduce phenomenon of fracture of wire to happen greatly. Conditional can use clean water. Cutting fluid uses famous brand product as far as possible. Be like: Nanjing is amounted to promote a brand (oil radical) card of Zhejiang beautiful embellish (water radical) 　 　 4.

6 all-around the happening that improves appearance of fracture of wire of 　 of operation personnel quality, also have huge concern with the operation. Carry out a proof, the operation is apt, phenomenon of fracture of wire can get huge decreases. For this, going up careful and serious, normative operation answers when the silk, operation that wear silk. In the meantime, when wanting to seeking a center automatically, if craft hole wall has smeary, burr or certain not electric material, when electrode silk shift arrives when hole wall not scintilla discharge, cause a machine tool cannot automatic inverting, strap electrode silk finally. Because must clear craft aperture clean before this treatment. When certain moment needs a hand to use cut () of manual control feed, should the eye watchs ammeter, do not get the frequency conversion rate when exceeding regular cut, otherwise extremely easy fracture of wire. Phenomenon of breakdown of 　 of 5 demonstration research 1: In DK7725 workbench job, scintilla discharge turns into suddenly blue arc discharge, electric current is restricted to be worth more than, electrode silk is burned, stop machine change after electrode silk, open accident to make, breakdown still exists. Use next measure part of input end and oscillation not to have undee output with oscillograph, reason judgement breakdown goes out in oscillation part, overhaul oscillation part, high frequency power source returns to normal, workbench movement is normal. Breakdown phenomenon 2: Electric current is machined in DK7725 workbench job discharge of very big, scintilla is unusual fracture of wire. According to experience judgement, because the output of pulse power source already turned into to shed output be caused by continuously,breakdown reason is. Reason swings to much resonance from the output level of pulse power source implement the examination that pursue course is undee, discover component presses caustic, after changing, the examination outputs pulse weaveform of the standard. Open accident to go, breakdown removes. High speed of 6 conclusion 　 walks along a cut of electric spark line to machine problem of fracture of wire to happen, wanted to master basic principle only, repass experience is accumulated, solve very easily, if appear insoluble problem, must maintain manufacturer connection in time with unripe factory, try to solve jointly, anything but can blind act recklessly brings about workbench damage incur bigger loss. In the meantime, want each link of production, want to notice to discover in time and solve a problem, ceaseless summary accumulates experience. CNC Milling