Accurate discharge is machined (Precision Electrical Discharge Machining) (on)

The mould industry of 1 introductive Taiwan, have in mould market of the whole world rate already year after year increases, the production value of export already forced continuously advanced country, and the machine tools that produces the spot to go up to be able to be lacked least of all in the mould commonly, can saying to go up is discharge treatment opportunity. In recent years the effort as a result of each investigator (especially Japan) , of discharge resemble now, reach treatment parameter already gradually Anacreontic below, the technique that discharge processes is further upward, a little special fabricating characteristics is not defeated by cutting to machine. And the treatment respect in horniness material, such as SKD, exceed the treatment of tungsten of hard alloy, carbonization, discharge treatment is an indispensable treatment method, will conform to the principle of simplicity to machine a principle oddly to begin here, the application that narrates discharge treatment and newest technology develop. The principle of principle discharge treatment that 2 discharge machine is simple and character is to use electric energy to be changed into workpiece heat energy, make a kind of hot sex of frit of workpiece quickness be in harmony machines a method. Change character, when discharge is machined, be in in fluid electrode and job arise in fine clearance imperceptibly transfer phenomenon of electric arc discharge, produce thermogenesis to workpiece then, in the meantime, because the liquid in treatment is erupted by discharge pressure and aerification of hot action generation phenomenon, right now the part of frit of be in harmony of workpiece, in will accompanying frit of liquid aerification phenomenon to enter treatment fluid, workpiece produces discharge trace because of the action of discharge, undertake repeatedly so, the appearance that we hope can be machined finish, from this the hardness of knowable discharge treatment and workpiece has nothing to do to want only is but the material of electrify all can be machined, and wait for blame conductor material like pottery and porcelain, glass, discharge cannot be being used to machine in our general impression, however research of these a few years discovers recently, use special means, use discharge to also can process blame conductor data, basic discharge principle reachs theory, if the word that will describe from the viewpoint of imperceptible view pursues 1 shows a picture this knowable treatment fluid is in 1 discharge primary reason in discharge treatment the mainest act refrigeration and quick response extremely the insulation condition between, of course aerification bilges the action of pressure also is one of roles with treatment very important fluid. Icon is the discharge trace after single shot discharges. From measure (1)~(5) is made an appointment with thousands of times toward the １ second of Fu type even tens of 10 thousand. Effective discharge treatment is discharge state happens, the treatment kind that most discharge mark is accumulated gradually and becomes, it is the principle of discharge treatment purify. → of energy of discharge of big ← single shot is small surface roughness of thick ← surface → of clearance of discharge of ← of → fine bounty is narrow → of speed of fast ← treatment pursues slow in the specification of state of discharge of 2 single shot from above, we know discharge treatment is the accumulation of discharge mark, and the discharge energy of single shot recovers big, discharge dent also heals big, machine speed, discharge clearance, the surface roughness that reachs treatment range also increases relatively, if the graph is shown 2 times,its concern. In process of single shot discharge, if the graph is shown 3 times,voltage reachs voltaic relation. Graph the relation of 3 voltage, electric current is actually in discharge treatment process, it is the phenomenon of successive discharge, if the graph shows a picture 4 times the relation of 4 voltage, electric current among them Γ N, Γ P is the very important parameter in discharge treatment, control Γ N, the different value such as Γ P machines the influence speed, machine what the surface roughness of the face reachs electrode to consume level, at present the discharge on market is machined machine, especially homebred, adjust the character that different Γ N and Γ P are machining already inferior wait for a country at Japan. The classification of opportunity of 3 discharge treatment basically discharges treatment opportunity can be divided for a few categories, if the graph shows a picture 5 times,its machine a principle the different figure that discharge of 5 carve model machines a principle to use electrode, can machine the figure that workpiece needs into us. Although use very simple vulture model machine to be able to machine the appearance that gives all sorts of patterns, but machine of project of vulture model discharge still has the following problems: (Of 1) electrode in using up discharge carve model, of electrode using up is very a Gordian knot, compared with the treatment that cut bits, of electrode tool use up rate (quantity) quite considerable, those who solve electrode spend a question, without giving thought to the research and development from electrode material, of discharge circuit improved, at present Japanese each discharge machines engine plant to roll out the discharge of low consumption to machine master in succession, how to reduce use up or 0 using up is the task with be engaged in discharge machining research main at present. (Of 2) electrode make in treatment of discharge carve model, of electrode making is very important. The electrode that has high accuracy just machines the pattern that gives high accuracy likely. At present opportunity of major vulture model treatment all uses cupreous electrode, because treatment is easy, the advantage such as electrode material petty gain, cupreous electrode material still is used in great quantities. Be in however when must wanting to machine complex small mould figure, of electrode make it is difficult to still have its. 3 water chestnut electric machinery of Japanese are rolled out recently use pure electrode, NC of by means of controls X Y axis to make the scanning treatment of past Fu type, make good omissions automatically plus electrode, yi Ke processes very complex form, can solve the making problem of electrode so. If the graph is shown 6 times (relevant paper consults please " discharge processing technique - news of daily newspaper industry one book " ) axis of X-Y of treatment of programmed control of graph 6 NC is mobile by NC programmed control (because 3) treatment precision machines a condition, the metropolis such as treatment parameter and electrode material affects the precision of treatment, especially the precision requirement of all sorts of dimension is at present strict with each passing day, lending each the adjustment of parameter, the accretion that reachs treatment fluid powder, avoid the relevant research that centers discharge to wait as far as possible, had had positive result gradually, at present the lens face of high accuracy is machined, unchallenged already. CNC Milling