Electric spark treatment

.

After Lazalianke's couple considers to invent, be improved with what control a system as pulse power source and rapid development rises. The pulse power source that uses at first is simple RC (resistor - capacitance) loop. At the beginning of 50 time, improve for RLC (resistor - inductance - capacitance) wait for loop. In the meantime, still use the power source of alleged long pulse of pulse dynamo and so on, make corrode rises except efficiency. Tool electrode is reduced relative to loss. Appeared again subsequently high-power valve the power source of high frequency pulse such as ﹑ thyratron, made the productivity below condition of same appearance surface roughness is able to rise. 60 time metaphase, development becomes transistor and power source of pulse of silicon controlled rectifier, and raised the sources of energy to use efficiency and reduced tool electrode loss, what enlarged thick finish machining is adjustable limits. To 70 time, appeared the power source such as a pulse such as ﹑ of pulse of much loop of ﹑ of tall low-pressure and compound pulse and adjustable and undee pulse, in treatment surface surface roughness ﹑ treatment precision is mixed reduced the respect such as tool electrode loss to have new progress again. Commanding systematic respect, from the advance and retreat that holding discharge clearance simply at first and controls tool electrode, work up arrives use miniature calculator to have timely control to all sorts of elements such as electric parameter and blame report parameter. Those who machine electrode of the tool when the principle is machined and workpiece to receive pulse power source respectively is polar, and immerge job fluid medium or and fill working fluid discharge gap (see figure below) . Control tool electrode through clearance automation system to workpiece feed, when the clearance between two electrode achieves certain distance, the pulse voltage that brings to bear on on two electrode will work fluid puncture, produces scintilla to discharge. In the imperceptible channel of discharge instantaneous concentrates much heat energy. Temperature can be as high as above of 10 thousand Celsius. Pressure also has sharp change, the metallic stuff that makes this job expresses local minim thereby fuses immediately ﹑ aerification, explodes type ground splatters in working fluid, rapid condensation, the metal that form solid body is atomic, and be taken away by working fluid. Leave the indentation mark with small the next apparently in workpiece at this moment. Discharge weak point suspends resting. Fluid of the job between two electrode regains insulation position. Back-to-back, the puncture of another bit of place that next pulse voltage is close to relatively in two electrode again, produces scintilla to discharge, and repeat afore-mentioned processes. Such, although every metallic amount that pulse discharge corrode divides is few, but because every second has by tens of thousands action of second pulse discharge, can corrode divides more metal, has certain productivity. In hold tool electrode and work between constant below the condition of discharge clearance, at the same time corrode divides workpiece metal, makes at the same time tool electrode ceaselessly to workpiece feed, machine an appearance that answers relatively with tool electrode appearance to come finally. Accordingly, the opposite movement way between the form that should change tool electrode only and tool electrode and workpiece, can machine piece all sorts of complex model face. Tool electrode is commonly used conductivity is good ﹑ melting point is higher of ﹑ easy treatment be able to bear or endure electric corrode material, tungsten alloy of copper of ﹑ of black lead of the ﹑ that is like copper and molybdenum. In machining a process, tool electrode also has loss. But the corrode that can make its are less than workpiece metal divides an amount, adjacent even at nondestructive bad news. Working fluid regards discharge as medium, still removing cooling ﹑ to discharge the action such as bits in machining a process. Commonly used job fluid is viscosity the medium that taller ﹑ function stabilizes inferior ﹑ flash point, if kerosene ﹑ goes,ionic water is mixed emulsion. Sort reachs the feature that moves relatively between its and workpiece according to the form of tool electrode, and can be cent of means of electric spark treatment ① of 5 kinds of ﹕ to use shape the wire that the ② of ﹔ of electric spark form cutting that tool electrode makes simple feed move relative to workpiece uses axial to move makes tool electrode, workpiece needs appearance and dimension to make orbit move to machine ﹔ ③ to use tinsel or figuration electric conduction to grind a rotate with the cut of electric spark line of cut conductor by place the electric spark that tool electrode undertakes alveolus grinding or the ④ of ﹔ of electric spark grinding of figuration grinding uses at machining gear of ﹑ of plug guage of whorl of ﹑ of whorl ring gauge to wait. Characteristic and the main characteristic that use electric spark treatment are ﹕ ① can machine common cutting to machine a method ③ of cutting force ﹔ is not had when the material of cutting and ② of ﹔ of complex form workpiece are machined hard do not produce burr and knife mark the blemish ﹔ such as channel grain material of ④ tool electrode is beardless compare, facilitate the surface after realizing automation ﹔ ⑥ to machine produces degenerative layer, and need in certain applying farther. CNC Milling