JP2004255497A - Device for guiding wire electrode in wire electric discharge machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for guiding a wire electrode, which is manufactured to be compact at a small production cost, and used at a small running cost without requiring compressed air. <P>SOLUTION: A first guide block 30a having a first orifice 31 is vertically connected to a second guide block 30b having a second orifice 32. An outer pipe 33 extending downward and an inner pipe 34 for guiding the wire electrode passing through the first orifice 31 and the second orifice 32 are suspended from the second guide block 30b. A water discharge passage 44 is formed between an outer periphery of an intermediate pipe 35 slidably fitted upon the inner pipe 34 and the inside diameter of the outer pipe 33 so as to open downward. The second guide block 30b comprises a lower cavity 43 for guiding the pressurized water, which has been introduced to a downstream side of the second orifice 32 in the wire carrying direction, into the inside diameter portion of the inner pipe 34, and a second passage 49 for guiding the pressurized water, which is flowing from the second orifice 32 toward the first orifice 31, into a water discharge passage 47. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
[Industrial applications]
The present invention relates to a wire electrode supply apparatus that can easily send and supply a wire electrode to a work area of a work at the time of connection or the like.
[0002]
[Technical background]
Normally, in wire electric discharge machining, a wire electrode sent from a wire supply reel is subjected to electric discharge machining with a workpiece (work) via a tension device guide pipe and an upper guide, and then to a lower guide and a transporter. After being passed through the device and the name of the discharge roller, it reaches the wire collection box and is collected. Such a wire electrode is usually thin, having a diameter of about 0.05 mm to 0.3 mm. When applying a machining discharge pulse between the wire electrode and the workpiece (work) to perform drilling of a complicated cross-sectional shape on the workpiece, after processing of one workpiece is completed, Before processing the next workpiece, it is necessary to perform a wiring operation in which the wire electrode is forcibly cut once and a new wire portion is again supplied to the upper guide.
[0003]
Further, during wire electric discharge machining, the wire electrode may be disconnected due to an abnormal situation such as a concentration of electric discharge in a limited range in a small gap between the wire electrode and the workpiece. Even in that case, a new wire portion of the wire electrode must be supplied to the upper guide.
[0004]
[Prior art]
As a wire electrode supply device for quickly performing this wiring work, for example, in Patent Document 1, a guide pipe for a wire electrode includes a pipe main body and a connecting pipe attached to a lower end thereof, and the pipe main body includes A V-shaped first guide provided at the center of the upper end, a cavity provided subsequently thereto, a compressed air ejection section provided below the cavity, and a compressed air ejection section provided below the ejection section. A V-shaped second guide, a jet nozzle provided subsequently to the jet nozzle for jetting pressure water, and a connection pipe provided below the second guide, the first guide, the second guide, the jet nozzle, and the connection pipe. A configuration in which the pipe is electrically insulated from the pipe body is disclosed.
[0005]
According to this configuration, during electric discharge machining, pressure water is always supplied from the pressure water inlet to the guide pipe direction, and the pressure water flows from the connection pipe to the upper guide below the connection pipe. The wire electrode has an effect that the thrust of the jet of the pressurized water does not always come off the upper guide.
[0006]
[Patent Document 1]
JP-A-5-92321
[Problems to be solved by the invention]
However, according to the above-mentioned conventional configuration, the pressurized water flows backward from the jet nozzle, blows out from the upper end of the pipe main body through the second guide → the cavity → the first guide, and the components such as the electric actuator above the pipe are used. In order to prevent the air from being disabled, a configuration is adopted in which compressed air is supplied from between the second guide and the cavity.
[0008]
Therefore, since equipment such as a device for generating compressed air and a supply pipe as an energy source is required separately, there is a problem that the structure of the electric discharge machine becomes complicated, the cost increases, and the running cost also increases. Was.
[0009]
SUMMARY OF THE INVENTION An object of the present invention is to provide a wire electrode supply apparatus which solves the above-mentioned conventional problems, has a simple configuration, and does not increase running costs.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a wire electrode supply device in a wire electric discharge machine according to the invention of claim 1 is a wire electrode guide device in a wire electric discharge machine for guiding a wire electrode to a work area of a workpiece. A guide block provided with a first orifice and a second orifice appropriately separated from each other in a vertical direction; an outer pipe extending downwardly; and a wire electrode guided from above through the first and second orifices. The inner pipe is suspended, and between the outer pipe and the inner pipe, an intermediate pipe is disposed so as to be able to ascend and descend so as to have a gap serving as a drainage channel between at least the outer pipe and the guide block. A first flow path through which the pressure water introduced downstream of the second orifice in the wire transport direction is led to the inner diameter of the inner pipe; In which the pressure water toward the first orifice and a second flow passage is guided to the drainage channel.
[0011]
According to a second aspect of the present invention, in the wire electric discharge machine according to the first aspect, the guide block includes a first guide block having a first orifice and a second orifice. A second guide block provided vertically above and below, and an outer pipe extending downward and a wire electrode are guided from above through the first and second orifices to the second guide block. A first flow path that suspends the inner pipe and the second guide block, in which the pressure water introduced downstream of the second orifice in the wire transport direction is guided to the inner diameter portion of the inner pipe; A second flow path through which the pressurized water flowing from the second orifice toward the first orifice is guided to the drainage channel.
[0012]
According to a third aspect of the present invention, in the wire electric discharge machine according to the first or second aspect, the drainage channel is opened at a lower end of an outer pipe.
[0013]
According to a fourth aspect of the present invention, in the wire electrode guide device of the wire electric discharge machine according to any one of the first to third aspects, the pressure water passing through the inner pipe is supplied to the workpiece through the intermediate pipe. It is configured to be introduced into an upper guide disposed above.
[0014]
According to a fifth aspect of the present invention, in the wire electric discharge machine guide device of the fourth aspect, the suction passage for branching and sucking the pressure water between a lower end and an upper guide of the inner pipe. Is provided.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment embodying the present invention will be described with reference to FIGS. A work tank 2 is mounted on a base 1 of the wire electric discharge machine, and a workpiece (a work piece) mounted and fixed on a work table 3 fixed to the work tank 2 in the work tank 2. The work W is immersed in an insulating working fluid (fresh water or a mixture of fresh water and oil) 5. The processing liquid 5 is supplied from the processing liquid supply device 4, and the processing liquid 5 contaminated by the processing is collected in the processing liquid supply device 4, filtered through a filter or the like, and then circulated again to be supplied. An XY table 6 for moving the workpiece W on an XY plane is arranged between the base 1 and the processing tank 2 as shown in FIG. 1, and is driven and controlled by a drive mechanism (not shown). .
[0016]
A wire bobbin 9 around which a wire electrode 8 is wound is provided on the upper part of the column 7. An upper guide 11 is formed on an upper arm 10 supported on the upper part of the column 7 so as to be able to move up and down. A lower guide 13 is disposed on a lower arm 12 supported at a lower portion of the column 7.
[0017]
The machining fluid 5 is ejected from both or one of the upper guide 11 and the lower guide 13 toward the electric discharge machining part, thereby removing metal scraps in the electric discharge machining and cooling the electric discharge machining part. The running speed (running speed) of the wire electrode 8 varies depending on the electric discharge machining conditions, the thickness of the workpiece W, and the like, and is about 100 to 300 mm ² / sec at a thickness of about 50 mm.
[0018]
The wire electrode 8 pulled out from the wire bobbin 9 is sent via feed rollers 14, 15, 16 to an automatic connection mechanism 18 provided in a case 17 above the column 7 and to a wire guide device 20 of the present invention. After that, it reaches the upper guide 11. The wire electrode 8 is stretched substantially vertically from the upper guide 11 to the lower guide 13 via the workpiece W. The automatic wire connection mechanism 18 is a device for sending a new wire portion of the wire electrode 8 toward the guide device 20 and the upper guide 11 when newly supplying the wire electrode 8 or when cutting the wire. Although not shown, the connection mechanism 18 has a sensor for detecting a wire electrode, a powder brake for applying tension to the wire electrode 8 during electric discharge machining, and a normal / reverse rotation of the wire electrode 8 held by a pinch roller during machining and disconnection. A drive motor for rotating and sending in a predetermined direction, a cutting mechanism for cutting a defective wire portion including a broken portion at the time of disconnection, and a conducting device for supplying a pulse current to the wire electrode 8 during electric discharge machining are provided. Have been.
[0019]
When the workpiece W vertically passes from the upper guide 11 to the machining area of the workpiece W, electric discharge machining is performed in a minute gap (electric discharge machining part) between the wire electrode 8 and the workpiece W.
[0020]
The used wire electrode 8 whose traveling direction has been changed in the lateral direction by the direction changing pulley 14 arranged in the lower arm 12 supporting the lower guide 13 is forcibly conveyed by the wire collection unit 21. After being sent between the pair of rollers 22, the rotary cutter 23 and the fixed blade 24, and rotating the rotary cutter 22 to cut the used wire electrode 8 into a predetermined short length (50 to 100 mm). Is discharged to the collection box 25.
[0021]
Next, the configuration of the wire guide device 20 will be described in detail with reference to FIGS. The wire guide device 20 includes a guide block 30 provided with a first orifice 31 and a second orifice 32 through which the wire electrode 8 passes from above, which are appropriately spaced vertically. The guide block 30 includes a first guide block 30a having a first orifice 31 and a second guide block 30b having a second orifice 32, an outer pipe 33, an inner pipe 34, an intermediate pipe 35, and the like. A funnel-shaped wire introduction portion 38 is formed at the upper end of the substantially cylindrical first guide block 30a, and a small-diameter hole (a small-sized hole through which the wire electrode 8 can pass) is formed at the lower end of the wire introduction portion 38 at the lower end side. A first orifice 31 having a hole is fixed. The first guide block 30a is swingably supported by a spherical bearing 36 comprising an inner spherical surface and an outer ring having the same inner spherical surface as its outer peripheral surface. The spherical bearing 36 is a support base made of an electrically insulating material. It is attached to the lower part of the case 17 via 37.
[0022]
A female screw portion formed in an upper opening hole 39 of the second guide block 30b is threadedly connected to a male screw portion of the outer peripheral lower end of the first guide block 30a projecting downward from the spherical bearing 36. In the second guide block 30b, a mounting block 40 having a guide passage 41 which opens coaxially with the small diameter hole of the first orifice 31 and a second orifice 32 fixed to the lower end thereof is provided with the upper opening. The interior is provided through a hole 39. In the lower cavity 43 of the second guide block 30b, an upper part of the vertically elongated inner pipe 34 is mounted via a thrust stop ring 42 so as not to fall off. Accordingly, the inner pipe 34 and the outer pipe 33 are suspended downward from the second guide block 30a.
[0023]
An upper portion of an outer pipe 33 is screwed around the outer periphery of the second guide block 30b. A vertical communication between the outer pipe 33 and the inner pipe 34 is provided between at least the inner diameter of the outer pipe 33. Then, the intermediate pipe 35 is arranged so as to be able to move up and down so as to have a gap serving as a drainage channel 44 opened at the lower end. That is, a slider block 45 made of synthetic resin or the like screwed to the upper end of the intermediate pipe 35 is slidably fitted on the outer circumference of the inner pipe 34. Note that there is a gap between the inner diameter of the intermediate pipe 35 and the outer diameter of the inner pipe 34.
[0024]
A lower cavity 43 between the lower end of the second guide orifice 32 and the upper end of the inner pipe 34 communicates with a pressure water inlet base 46 provided on the side surface of the second guide block 30b. The first guide path guides the pressurized water to the inner diameter portion of the inner pipe 34, that is, the wire passage 47 through which the wire electrode 8 is inserted. Further, inside the second guide block 30b, a lower surface of the first orifice 31, an upper surface of the mounting block 40, and a second flow passage 49 having a large passage cross section communicating with the drainage passage 44 are provided. 40 is formed on the outer peripheral side. Accordingly, when the pressure water guided to the lower cavity 43 is directed toward the first orifice 31 via the second orifice 32 and the guide passage 41, the flow of the orifice portion of the first orifice 31, that is, the flow of the small diameter hole is reduced. The pressure water flows through the second flow path 49 having a flow resistance lower than the flow resistance, and the pressure water leaks from the opening 44 a at the lower end of the outer pipe 33 through the drain path 44. is there.
[0025]
If the guide block is configured as a separate body that can be disassembled into the first guide block 30a, the second guide block 30b, and the mounting block 40, the work of forming the lower cavity 43 as the first flow path and the second flow path 49 can be performed. The first and second orifices 31, 32 and the inner pipe 34 can be easily attached.
[0026]
The lower body 50a of the suction block 50 attached to the lower end of the intermediate pipe 35 by screwing or the like is connected to the lower spherical bearing 51, and the upper guide 11 is arranged on the outer peripheral support 52 of the lower spherical bearing 51. I do. The suction block 50 (the lower body 50a) is formed with passages 53, 53a communicating with the lower end of the inner pipe 34 and communicating with the guide orifice 11a of the upper guide 11 in a straight line in the vertical direction. A branch is provided with a suction passage 55 communicating with the suction base 54.
[0027]
A pipe from a pressurizing device 56 for applying pressure to and introducing the working fluid 5 is connected to the inlet base 46 of the guide block 30, and the suction base 54 is connected to a liquid suction side of the pressurizing device 56 or a separate liquid. It is desirable to supply the working fluid 5 instantaneously by connecting a pipe of the suction device 57 or the like.
[0028]
The first orifice 31, the second orifice 32, the guide orifice 11a and the like are made of an insulating material such as ceramics.
[0029]
The operation of the above configuration will be described. In the wire electric discharge machine configured as described above, the wire electrode 8 is inserted from the wire introduction portion 38 at the upper end of the first guide block 30a when supplying a new wire or connecting. When the tip of the wire electrode 8 passes through the second orifice 32 and reaches the upper end of the wire passage 47 of the inner pipe 34, when the working fluid 5, which is pressurized water, is introduced from the inlet port 46, the second orifice 32 side Since the wire electrode 8 is fitted in the small-diameter hole portion, the gap is extremely small and the flow path resistance is large, so that most of the pressure water flows to the wire passage 47 side of the inner pipe 34. The wire electrode 8 is sent to the lower end side of the inner pipe 34 by the thrust of the jet of the pressurized water, can reach the upper guide 11 through the suction block 50, and can quickly wire the workpiece W. .
[0030]
Then, by continuing to supply the pressurized water even during the electric discharge machining, most of the water flows from the lower cavity 43 as the first flow path to the suction passage 55 of the suction block 50 via the wire passage 47 of the inner pipe 34, Part of the pressure water is guided to the guide orifice 10a of the upper guide 11.
[0031]
And even if the wire breaks during processing, the thrust of the jet of the pressurized water in the wire passage 47 toward the lower end of the inner pipe 34 constantly acts, so that the tip of the cut wire electrode 8 jumps up and the upper guide 11 can be prevented from falling off.
[0032]
In addition, at the time of the processing or disconnection, the pressure water introduced from the introduction mouthpiece 46 is ejected upward from the lower cavity 43 as the first flow path through the second orifice 32 and further through the guide passage 41. When the water hits the first orifice 31 above it, the pressure water flows to the second flow path 49 side with a small flow resistance, and the lower end of the outer pipe 33 passes through the drainage path 44 between the outer pipe and the intermediate pipe 35. Through the opening 44a. Therefore, it is possible to prevent the upward flow of the pressurized water through the first orifice 31 and to prevent the upward flow of the pressurized water. This has the effect that the inconvenience does not occur.
[0033]
In the present invention, the mounting block 40 may be omitted, and the second orifice 32 may be directly mounted in the second guide block 30b. Further, the lower end of the intermediate pipe 35 may be directly connected to the upper guide 10 so that all the processing liquid (pressure water) from the lower end of the inner pipe 34 flows to the upper guide 10 side. Further, the pressurized water may be discharged or sucked out of the upper and lower portions of the outer pipe 33.
[0034]
[Action and Effect of the Invention]
As described above, according to the first aspect of the present invention, a wire electrode supply device in a wire electric discharge machine includes a wire electrode guiding device in a wire electric discharge machine that guides a wire electrode to a workpiece machining area. A guide block provided with two orifices appropriately separated from each other in the vertical direction, the guide block having an outer pipe extending downward, and an inner pipe through which a wire electrode is guided from above through the first and second orifices. And an intermediate pipe is disposed between the outer pipe and the inner pipe so as to be able to ascend and descend so as to have a gap serving as a drainage channel at least between the outer pipe and the outer pipe. A first flow path through which pressure water introduced downstream of the two orifices in the wire transport direction is led to the inner diameter of the inner pipe; and a first orifice from the second orifice. Pressurized water directed is that a second flow passage is guided to the drainage channel.
[0035]
Therefore, if a working fluid, which is pressure water, is introduced from the guide block, since the wire electrode is fitted in the small-diameter hole portion on the second orifice side, the gap is extremely small, and the flow path resistance is large. Most of the pressure water flows to the inner diameter side of the inner pipe. By the thrust of the jet of the pressure water, the wire electrode is sent to the lower end of the inner pipe, can reach the upper guide, and can quickly wire the workpiece.
[0036]
Then, even if the wire is broken during the processing, the thrust of the jet of the pressurized water flowing toward the lower end of the inner pipe constantly acts, so that the cut end of the wire electrode can be prevented from jumping up and falling out of the upper guide.
[0037]
Further, when the pressure water introduced into the guide block is ejected upward from the first flow path via the second orifice at the time of the processing or the disconnection, and hits the first orifice above the same through the guide passage, The pressure water flows to the second flow path side having a low flow resistance and can leak from an opening at a lower end of the outer pipe through a drainage path between the outer pipe and the intermediate pipe. Therefore, it is possible to prevent the pressurized water from flowing upward upward through the first orifice. Therefore, even if electric components such as an electric motor, an electromagnetic solenoid, and a sensor are arranged near the upper portion, the occurrence of electric leakage or the like can be prevented. This has the effect that no inconvenience occurs.
[0038]
In addition, as a configuration for achieving the above-described operation and effect, a drainage channel is formed between the outer pipe and the intermediate pipe, and a second channel for guiding pressure water to the drainage channel between the first orifice and the second orifice. Since it is a simple configuration having only a flow path, the manufacturing cost can be reduced and the device can be made compact. In addition, since compressed air is not required unlike the conventional case, the energy source can be reduced and the running cost can be reduced.
[0039]
According to a second aspect of the present invention, in the wire electric discharge machine guide device according to the first aspect, the guide block includes a first guide block having a first orifice and a second orifice. A second guide block vertically connected to the second guide block; an outer pipe extending downward; and an inner pipe through which a wire electrode is guided from above through the first and second orifices. A first flow path through which the pressurized water introduced downstream of the second orifice in the wire transport direction is guided to the inner diameter portion of the inner pipe; And a second flow passage through which pressurized water flowing from the two orifices toward the first orifice is guided to the drainage passage.
[0040]
If the guide block is configured as a separate body that can be disassembled into a first guide block and a second guide block, a work for forming the first flow path and the second flow path, and a work for mounting the first and second orifices and the inner pipe. And the like can be easily performed.
[0041]
According to a third aspect of the present invention, in the guide device for a wire electrode in the wire electric discharge machine according to the first or second aspect, the drainage channel is opened at a lower end of the outer pipe. Even if the pressurized water drips from the lower end of the outer pipe, that part is in the machining tank, so that the outside of the electric discharge machine does not get wet.
[0042]
According to a fourth aspect of the present invention, in the wire electrode guide device of the wire electric discharge machine according to any one of the first to third aspects, the pressure water passing through the inner pipe is supplied to the workpiece through the intermediate pipe. It is configured to be introduced into an upper guide disposed above.
[0043]
Therefore, by continuously supplying the pressurized water even during the electric discharge machining, most of the pressure water is guided from the first flow passage to the guide orifice of the upper guide together with the wire electrode through the inner diameter portion of the inner pipe to cool the machining area. It has the effect of being able to.
[0044]
According to a fifth aspect of the present invention, in the wire electric discharge machine guide device of the fourth aspect, the suction passage for branching and sucking the pressure water between a lower end and an upper guide of the inner pipe. Is provided, so that an appropriate amount of pressurized water can be guided to the upper guide as needed.
[Brief description of the drawings]
FIG. 1 is a schematic side view of a wire electric discharge machine.
FIG. 2 is a partially cutaway sectional view of a guide device for a wire electrode.
FIG. 3 is an enlarged sectional view of a main part on an upper side of a guide device for a wire electrode.
[Explanation of symbols]
W Workpiece 2 Work tank 3 Work table 8 Wire electrode 10 Upper arm 11 Upper guide 20 Wire guide device 30 Guide block 30a First guide block 30b Second guide block 31 First orifice 32 Second orifice 33 Outer pipe 34 Inner pipe 35 intermediate pipe 38 wire introduction part 40 mounting block 41 guide passage 43 lower cavity 44 as first passage 44 drainage passage 47 wire passage 49 second passage 50 suction block

Claims (5)

In a wire electrode guide device in a wire electric discharge machine for guiding a wire electrode to a work area of a workpiece,
A guide block provided with a first orifice and a second orifice appropriately separated from each other up and down,
The guide block suspends an outer pipe extending downward and an inner pipe through which a wire electrode is guided from above through the first and second orifices,
Between the outer pipe and the inner pipe, an intermediate pipe is arranged so as to be able to ascend and descend so as to have a gap serving as a drainage channel between at least the outer pipe,
In the guide block, a first flow path through which the pressure water introduced downstream of the second orifice in the wire transport direction is guided to the inner diameter portion of the inner pipe, and from the second orifice to the first orifice. A guide device for a wire electrode in a wire electric discharge machine, comprising: a second flow path through which heading pressure water is guided to the drainage channel. The guide block is configured by vertically connecting a first guide block having a first orifice and a second guide block having a second orifice,
The second guide block suspends an outer pipe extending downward and an inner pipe through which a wire electrode is guided from above through the first and second orifices,
In the second guide block, a first flow path through which the pressure water introduced downstream of the second orifice in the wire transport direction is guided to the inner diameter of the inner pipe, and the first orifice from the second orifice. The guide device for a wire electrode in a wire electric discharge machine according to claim 1, further comprising a second flow passage through which the pressurized water toward the orifice is guided to the drainage passage. The guide device for a wire electrode in a wire electric discharge machine according to claim 1, wherein the drainage channel is opened at a lower end of an outer pipe. The wire discharge according to any one of claims 1 to 3, wherein the pressure water passing through the inner pipe is introduced into the upper guide disposed above the workpiece through the intermediate pipe. Guide device for wire electrodes in processing machines. The guide device for a wire electrode in a wire electric discharge machine according to claim 4, wherein a suction passage for branching and sucking the pressure water is provided between a lower end of the inner pipe and an upper guide.

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