JP2552852B2 - Wire cut electrical discharge machine - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a wire cut electric discharge machine for electric discharge machining using a wire electrode.

[Conventional technology]

In wire-cut electric discharge machining, plate-shaped workpieces are made to face each other in a direction substantially perpendicular to the axial direction with respect to the wire electrode that is continuously renewed and fed in the axial direction between a pair of positioning guides arranged at a predetermined interval. A sawtooth-shaped cutting and cutting process is performed by applying an intermittent voltage pulse in a state where a working liquid is interposed between the two and generating discharge. In recent years, wire-cut electric discharge machining has undergone various improvements in order to increase machining speed, increase machining accuracy, improve machining efficiency, and improve machine operability. However, it can be seen in the way of flowing the machining liquid into the machining gap and the configuration around the positioning guide. In other words, in order to improve the processing accuracy, to stabilize the processing, to improve the reproducibility, etc., the method of performing processing while the workpiece is immersed in the circulating fluid in the processing tank is becoming popular. However, in many of the wire-cut electric discharge machines, a so-called coaxial nozzle in which the machining liquid coaxially encloses the wire electrode and is jetted and distributed along the wire electrode to the machining gap is close to the workpiece. Is fixed to the nozzle or nozzle block because the wire electrode positioning guide needs to be provided close to the injection port in the coaxial nozzle and close to the workpiece in order to maintain accuracy. The structure provided integrally is adopted.

〔problem〕

However, in order to improve the machining speed, the supply pressure of the machining fluid is increased and the flow rate is increased. Therefore, the nozzle is displaced due to the reaction force of the jet machining fluid. However, there is a problem in that the guide integrated with the nozzle is displaced due to the displacement of (1) and the positioning accuracy is reduced.

[Means for solving problems]

The present invention has been proposed in order to solve the conventional drawbacks, in which the working liquid jetting nozzle and the internal wire guide thereof are individually provided with supporting heads that are individually adopted and held, and the respective supporting heads are provided. Each of them independently supports and fixes to the main body of the processing machine so as to be able to move up and down, and enables a relative up and down movement between the support heads of the insertion heads of the support heads that support the wire guide inside the machining liquid jetting nozzle. It is characterized by being constituted by a movable seal structure.

〔Example〕

The present invention will be described below with reference to an embodiment of the drawings. Reference numeral 1 is a wire electrode, which is supplied from a reel 2 and moves between upper and lower wire guides 3 as shown by arrows. It moves with a predetermined tension and speed by the take-up drive device and the brake. Four
Is an object to be processed, which is processed so as to face the wire electrode 1 between the wire guides. Reference numeral 5 is a machining fluid injection nozzle for injecting a machining fluid to the machining part of the workpiece, which is provided so as to surround the wire guide 3 and the conduction electron 6, and the machining fluid injection port 52 at the tip is to be machined. It is provided so as to be coaxial with the center of the wire electrode 1 while facing the processed part of the body 4. The machining fluid injection supply nozzles 5 are usually provided symmetrically above and below the workpiece, and the machining fluid such as water is pumped to the machining fluid injection nozzle 5 through the supply port 51, and the machining fluid ejection port 52 at the tip of the machining fluid is processed. It is jetted from above and below toward the body processing part.
The machining liquid jet nozzle 5 and the wire guide 3 are provided by a movable seal structure such as a bellows 7 so as to be able to move up and down relatively. Reference numeral 8 is a support head that supports and fixes the wire guide 3, and 9 is a support head that supports and fixes the machining liquid jet nozzle 5, both of which are arms 10 extending from the column 11.
Are separately and independently connected so that they can be adjusted vertically. The lower wire guide and the working liquid jet nozzle are also provided in the same manner.

The power is supplied from a processing power source (not shown) by connecting the wire electrode 1 from the conduction electron 6 and the lead wire directly to the workpiece 4. Since the conduction 6 for energizing the wire electrode 1 is energized in the working fluid in the working fluid injection nozzle 5, it has a sufficient cooling effect and a large current can pass without fear of disconnection. The machining fluid supplied from the external pump device to the machining fluid injection nozzle supply port 51 is supplied at a high pressure to increase the jet pressure, and the tip ejection port 52 ejects the machining fluid at a high pressure toward the machining gap to machine the workpiece. Control is performed so that a large amount of machining fluid is jetted into the internal machining gap through the groove. The machining fluid jet nozzle body 5 vibrates or warps and changes its position due to the reflection impact of the machining fluid jet pressure. The machining fluid jet nozzle 5 is supported by the arm 10 independently of the wire guide 3 by the support head 9. The wire guide 3 is not vibrated or displaced. The support head 9 for supporting and fixing the machining liquid jetting nozzle 5 is adjusted in the vertical direction and set at a predetermined position. At this setting, during the pressurization jet of the machining liquid, or the machining jet is turned on / off. It is unavoidable that the position of the support head 9 changes minutely due to fluctuations in hydraulic pressure. However, the positional fluctuation of the support head 9 is not propagated to the wire guide 3 because the fluctuation of the machining liquid jet nozzle 5 is absorbed by the bellows 7.

That is, the machining liquid jetting nozzle 5 and the internal wire guide 3 are attached to and held by separate supporting heads, and the supporting heads 8 and 9 are independently supported and fixed so that they can be vertically moved to the processing machine body. The insertion wall portion of the support head 8 supporting the wire guide 3 into the machining liquid jet nozzle is constituted by a movable seal structure that enables relative up and down movement between the support heads. Therefore, the displacement of the machining liquid jet nozzle 5 does not propagate to the wire guide 3, and the wire electrode 1 can be stably and highly accurately guided while maintaining a stable guide position.

〔The invention's effect〕

As described above, according to the present invention, the machining liquid jetting nozzle and the internal wire guide thereof are mounted and held on separate support heads, and the respective support heads are independently supported and fixed to the processing machine main body so as to be vertically movable. And a movable seal structure capable of moving up and down the insertion wall portion of the support head supporting the wire guide into the inside of the machining liquid jet nozzle between the support heads. Since it is configured to be able to absorb even a minute impact by configuring the above, it is possible to prevent vibration and position change of the machining fluid jet nozzle during jetting of the machining fluid from propagating to the wire guide. Can guide the moving wire electrode stably and with high accuracy, and thus can perform the wire-cut distribution processing with high accuracy and provide stable operation. Increasing the processing speed can be performed good wire cutting of efficiency by.

[Brief description of drawings]

 The drawing is a block diagram of an embodiment of the present invention. 1 ... Wire electrode 2 ... Reel 3 ... Wire guide 4 ... Workpiece 5 ... Machining liquid injection nozzle 6 ... Conductor 7 ... Bellows 8, 9 ... Support head

Claims (1)

(57) [Claims] 1. A pair of wire guides arranged at a predetermined interval, a wire electrode renewed and fed with a predetermined tension and speed between the wire guides, and an axial direction of the wire electrode. A machining table that allows the workpiece to face the workpiece through a machining gap from a perpendicular direction, and a machining table that surrounds the wire guide and coaxially surrounds the wire electrode so as to face the workpiece. The liquid jet nozzle and the working liquid jet nozzle jet and supply the working liquid coaxially along the wire electrode toward the working gap, and a working voltage pulse is provided between the wire electrode and the workpiece. In the wire-cut electric discharge machining apparatus for applying, the machining liquid jet nozzle and the internal wire guide are attached to and held by separate support heads, and each of the support heads is independent. The support wall that is vertically supported and fixed to the main body of the processing machine so that it can be moved up and down, and the insertion wall portion of the support head that supports the wire guide inside the processing liquid jetting nozzle is movable to allow relative up and down movement between the support heads. A wire-cut electric discharge machine characterized in that it is constituted by the seal structure of.