Of silk of the electrode in line cut treatment choose those who reach electrode silk to decide line issue
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5 ℃ , zincic boiling point is only also 907 ℃ . In cut process, as a result of action of high temperature discharge, cut line can reach high temperature of 2000 ℃ above in the instant, the energy that the zinc after aerification can produce the discharge in cut takes the appearance of cut metal, improve rinse the effect, the atmospheric pressure that at the same time zincic aerification place generates returns the corrode substance that can produce discharge to be blown. This one theory considers to show, content of the zinc in electrode line is higher, cut effect is better. But from nonferrous metal treatment learns to tell, after zincic scale exceeds 40% , the organization of α single-phase crystallization of electrode silk will turn α and β into organization of double photograph crystallization, right now material can become too fragile and do not suit to machine the filament with very small diameter. Silk of common and brass electrode is being gone after generally efficient of cut got machine craft respect today restrict, thereby ecbolic an electrode silk that owns other and special property. Consider to sum up according to current domestic and international technology, electrode silk material must have the following character: 1.
Physical characteristic is in process of treatment of electric spark discharge, electrode silk needs the pulling force with can bear certain and the wallop that cause because of discharge. If data strength is too low,perhaps rupture tenacity is too low, can cause electrode silk to shake, cause cut workpiece appearance finally not smooth, can cause stria of much talk cut even. Especially the metallic workpiece to a few difficult treatment, the tension that brings to bear on when cut (the intensity that constitutes electrode silk material) bigger, jump over easy cut. Additional, material pledges intensity still conduces to electrode silk restoring to be spent continuously, the work that has the electrode silk material of certain extensibility to have rake to cut also can be compared beneficial. 2.
Aerification character is in treatment process, the quantity of heat that discharge produces increases ceaselessly, if quantity of heat cannot pass other medium be released in time quite, the electrode silk with again high melting point also can be burned, because this constitutes the material of electrode silk must can give areas of these quantity of heat. 3.
The physical character of silk of physical character electrode is the key that improves cut efficiency, it is the melting point that points to electrode silk normally. The compositive metal quality that this basically matchs to compare the capable person that reach core by the fundamental component of electrode silk material decides. Because electrode silk is in when cut shake the short circuit effect that can produce the moment, at this moment, cut process can be decelerated, such when electrode silk not because of discharge ablation with gap of the generation between cut metal, cut abandons bits to won't be taken by strong water, at this moment electrode silk can be burned. 4.
The geometrical character that says here is to point to dimension precision and dimension stability normally. The external diameter of electrode silk decided the exterior dimension precision of cut workpiece directly, the design of machine tool of current electrode silk also asks electrode silk has minor appearance geometry error. And the final measure precision of electrode silk can be assured only by the dimension precision of the mould that pull silk, the machine tool still does not have the cut of current world to come according to electrode silk external diameter the function of self-adjusting cut precision, if dimension precision is not stable, final cut precision is not stable also. 5.
Electric and characteristic electric spark machines the discharge that leans the moment to corrode cut metal, spark clearance is shorter, the metallic surface of cut is bright and clean degree taller, because this electrode silk must be had,can bear the ability of electric current of instantaneous tall pulse and big cut electric current. The classification of electrode silk sheds the electrode silk of travel in the market now is 5 kinds of afore-mentioned characteristic organic combination, also can join a few otherer particularly apparent function, wait like high strenth, strong extensibility. According to different use condition and treatment state, electrode silk can divide it is a few kinds as follows: 1.
Silk of common and brass electrode silk of this kind of electrode is alloy of cupreous zinc n duality, because suffer zincic content to restrict, promotion of its cut speed is finite, be used by present domestic average user commonly, the pink that drop copper, breaking a string is the common phenomenon in using process of this electrode silk. Graph 2: Brass silk 2.
Material of core of galvanization electrode silk is common brass, outside plating a zinc, because zinc is in the aerification action in cut process, the discharge of silk of this kind of electrode will be stabler, cut surface is slicker than common and brass silk. The more mature production country on international basically distributings in Europe, at present home also has individual manufacturer to be able to be produced, dropping pink is this electrode silk the common problem in use process. Graph 3: Galvanization silk 3.
Material of core of silk of speed film electrode is common brass, film is cupreous zinc alloy, film compares silk of common galvanization electrode slightly thick. The cut speed of silk of commonner galvanization electrode wants silk of electrode of this kind of film fast, agree with efficient treatment, at present silk of this kind of electrode can be produced in abroad only, china still lies development phase. 4.
Diffuse anneal electrode silk considers to discover, the surface has even the discharge that the electrode silk of small hole hole can improve electrode silk rinses the effect, be based on this, produced this kind of appearance the electrode silk of poriferous structure. Diffuse material of core of anneal electrode silk is the copper that do not have oxygen, pass diffuse anneal is outer alloy of packet of zinc of a copper (the scale of copper and zinc is 1: 1) , because core material is the copper that do not have oxygen, surface layer is to use diffuse the poriferous structure that anneal forms, reason of silk of this kind of electrode rinse silk of electrode of effect excel convention. But the tensile strength of oneself of the copper that do not have oxygen is inferior, the electrode silk intensity that makes for core material with its is very low also, have 500MPa only, at present silk of this kind of electrode agrees with only the special treatment of special machine tool. 5.
Material of core of silk of steel core electrode is steel wire, pure copper of surface layer plating again plating is brass, also have direct plating brass, because material of core of silk of this kind of electrode is steel, the intensity that reason issues silk of this kind of electrode in high temperature greatly prep above above silk of 4 kinds of electrode, special agree with the treatment below difficult condition, if exceed thick, big rake, multilayer, strong water the difficult treatment material such as undesirable, black lead, monocrystalline silicon. 6.
Careful model the electrode silk diameter with electrode general silk is the smallest for 0.
07mm, the careful treatment that horn of small to having α asks, the diameter of α horn asks to achieve 0.
02-0.
10 Mm, must choose tungsten at this moment or molybdenum will make exceed fine electrode silk, but because of tungsten or molybdenum belongs to rare metal and treatment difficulty is greater, often use undermentioned piano silk to replace. 7.
Piano electrode silk the high-carbon steel that silk of this kind of electrode uses to make piano because of core material, call piano silk again so. Material of core of piano electrode silk is high-carbon steel, surface layer plating is brass, also have again of galvanization. High-carbon steel value is inferior, so silk of this kind of electrode often is replaced afore-mentioned careful model electrode silk. High carbon steel wire via how second treatment and heat treatment, intensity can comparative with tungsten filament or molybdenum silk. The problem breaking a string of electrode silk shows level, chinese exact pattern and mechanical nicety make treatment or a burgeoning trade, of very much new technology use still lie attempt phase. Afore-mentioned the 3rd, 4, 5, 6, silk of 7 kinds of electrode is being used actually of China very few still, the electrode silk that often uses has brass silk and galvanization electrode silk only two kinds, silk of these two kinds of electrode is aimed at below the problem breaking a string that often appears in use process does one analysis. 1.
In the process that using electrode silk to breaking the misunderstanding of the line, user or cut master can think by accident because electrode silk intensity is low,the line is and be pulled, the real reason that breaks a string actually is not electrode silk intensity low, however tenacity is insufficient. The tensile strength that appears in great quantities in the market now has the electrode silk of 450MPa only, be because is intensity low,and be often pulled? Actual condition is not such. The place before be like is narrated, the essence of cut of electric spark of silk of don't go yet is to rely on discharge to corrode come cut metal, discharge is being formed to corrode hole hole in electrode silk face when discharge is the prime cause that electrode silk breaks a string when cut. Will tell from operation level, tensile strength has been jumped over higher, because intensity jumps over tall electrode silk to be spent continuously,can have jumped over, wear silk more easily also, but if from the operation the level increases tensile strength, can bring about discharge function to drop. Also silk of a few electrode produces an enterprise to there is the high tensile strength, electrode silk that at the same time discharge function also is not damaged already in development now. 2.
The essence that breaks a string from rupture mechanical angle looks, rupturing expand arise after certain level in crackle source. When discharge, electrode silk face can corrode action to form a lot of hole holes because of discharge, electrode silk perhaps also can be discharged the concussion of bits at the same time by electric spark, in cut process a few suffer the small hole hole with the smallest force to because rupture to tenacity is not worth and happen,can rupture, break a string namely. 3.
It is very important that the action water that water pours in process of treatment of electrode silk discharge machines the action in the process in electric spark, what what machine tool of silk of don't go yet uses normally is fragile material has silk of colophony, filter, electrode to wait, and colophony and filter basically are to use cleanness and the water that filter be used circularly in the move back and forth on the machine tool, in order to make sure the aerification character of electrode silk is not reduced. The small hole that forms in discharge process and very much element are concerned, the mainest factor pours water namely, the effect of strong water affected electrode directly the aerification of clearance is characteristic between silk and workpiece. Of course, strong water still can corrode report easily the platoon abandoning bits of generation goes, take away the quantity of heat of the generation in discharge process. 4.
Cheap the electrode silk that electrode silk problem shows level our country to use, 95% above are made by the common brass of the 60~65% that contain copper, and our country is the country that resource of a copper shorts badly. As recently of price of two years of copper climb with each passing day litre, home makes an enterprise begin to choose individually reclaim a future life of useless miscellaneous copper produces electrode silk bus, and the iron, nickel, stannum, lead harmful foreign matter that drops electrode silk function often is contained in these useless miscellaneous copper. Because level of craft of Chinese fine copper is not at present high, keep clear of hard these impurity, the structure of organization of electrode silk interior that creates production to come out is inhomogenous, reduced the tenacity of electrode silk and final performance characteristics thereby, become the culprit that causes a string. This can reduce treatment efficiency not only, the treatment quality that still can affect cut work damages even machine tool. And average user detects again the existence that is less than these foreign matter elements, in be operated actually, often reduce a line through lowering cut rate, some users return function of ascribe machine tool even the technology of change or cut master is not high. Graph 4: Average cut line produces the place on put together of epilogue of the graph between craft to narrate, when the choice uses electrode silk, want to begin from type above all, see type suit the electrode silk of what type; Want to consider to machine operating mode next, what if machine character of material hardness, surface,requirement of precision of spare parts of requirement, treatment and machine tool choose the character state of material of bad news of form a complete set to wait, consider the stand or fall of water quality even of course; Equipment of machine tool of again secondary consideration whether often full load moves; Consider the function difference of all sorts of different electrode silk even finally. CNC Milling CNC Machining