1, The basic principle of EDM wire-cutting processing:
EDM wire cutting processing, pulse discharge between the electrode wire and the workpiece, as shown in figure one. When coming to an electric pulse, between the electrode wire and the workpiece produces a spark discharge, in the center of the discharge channel, the temperature instantly up to 10,000 ℃ or more, a high temperature so that the workpiece metal melts, so as to achieve the purpose of cutting metal.
2, The composition of the machine tool:
The machine tool mainly consists of a worktable, wire transport mechanism, wireframe, working fluid system machine electrical and numerical control system, and other parts.
(1) worktable
The worktable is used to clamp the workpiece to be processed, to achieve the processing of automatic feeding. It is mainly composed of an upper and lower cross-drag plate, precision ball screw, backlash-free gear, and guideway. The upper and lower drag plate moves back and forth along the precision linear guideway and its power is transmitted by the stepping motor to the ball screw through the backlash-free gear set to achieve, due to achieving a pulse to make the worktable move 0.001mm requirements, and in the operation of the requirements of sensitive, smooth, and therefore on the precision linear guideway, ball screw, backlash-free gear set, the drag plate have strict requirements, not only the precision of the requirements of the high and have a certain degree of rigidity and wear resistance. Certain rigidity and wear resistance.
(2) Wire transport parts
The wire transport component is mainly used to drive the electrode wire according to a certain linear speed movement and the electrode wire is neatly wound on the storage barrel, the wire transport mechanism is composed of a motor storage barrel, upper and lower drag plate, synchronous belt, reversing device, and other components.
Its basic requirements are:
① The storage cylinder on the one hand rotating moving, to ensure that the electrode wire in the storage cylinder is neatly arranged.
② The radial runout and axial runout of the storage cylinder should be small.
③ Cylinder should be rotated forward and reverse.
④ The wire storage mechanism should be insulated from the bed.
⑤ The wire transporting part adopts a closed cover to prevent the working fluid from splashing.
(3) Wire frame parts
The wireframe parts are mainly composed of columns, an upper and lower cantilever, a guide wheel, a taper head, and other components. The wireframe component and the wire storage cylinder component together form the movement system of the electrode wire. The main function of the wireframe is to support the electrode wire when it is moving at a stable linear speed and to keep the working part of the electrode wire at a certain geometrical angle to the table plane.
The taper assembly (cross-type drag plate mounted on the upper cantilever) can ensure the machining workpiece achieves 6°/80㎜.
(4) Bed components
The bed is a whole square box structure, thus the rigidity and strength are good, the upper part of which is equipped with table parts, wireframe parts, and wire transporting parts, and the lower part is equipped with a working liquid tank and electrical parts of the machine tool, which is not only safe but also conducive to the improvement of the operating environment.
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