JP2000296416A - Wire feeder in wire electric discharge machine - Google Patents

Abstract

(57) [Summary] This wire feeder is provided with an air jet nozzle near a draw-out roller to ensure wire feeding. SOLUTION: This wire feeder is provided with a draw-out roller 17 provided near an outlet 32 of a wire guide pipe 15 which draws in a wire 1 drawn out from a lower wire head which receives a wire 1 after processing a workpiece. An air ejection nozzle 6 is provided in the vicinity. The air ejection nozzle 6 includes a solenoid valve 6A that opens in response to the rotation of the extraction roller 17. The controller 40 controls to open the solenoid valve 6 </ b> A of the air ejection nozzle 6 in response to the rotation of the extraction roller 17 so as to eject air in the traveling direction of the wire 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire electric discharge machine for electric discharge machining of a workpiece with electric discharge energy generated by applying a voltage between the wire electrode and the workpiece. And a wire feeder for supplying the wire feed system to the wire feed system.

[0002]

2. Description of the Related Art Various types of wire feeding devices have been developed for wire electric discharge machines. For example, Japanese Patent Publication No. 7-96168 discloses an automatic wire feeder for a wire electric discharge machine. Japanese Patent Publication No. 7-96167 discloses a sealing device for a wire electric discharge machine, in which an arm through which the wire electrode passes penetrates a side wall of a machining tank in order to supply the wire electrode to an electric discharge machining portion. ing. In a conventional wire electric discharge machine, a lower arm supporting a lower head is provided through a long hole formed in a rear side wall of a machining tank, and a lower wire head is provided corresponding to an upper wire head. The processing tank is configured to move relative to the lower arm on the XY axis.

However, in a conventional wire electric discharge machine, when a sealing device is provided between a long hole formed in a side wall of a machining tank and a lower arm, it is necessary to prevent a machining fluid from leaking from the machining tank. If a good sealing structure is adopted to improve the sealing performance of the sealing device, the working tank moving relatively to the lower arm will receive a large sliding frictional resistance, which will adversely affect the machining accuracy of the workpiece. In addition, the parts may be damaged due to wear or the like.

[0004] In order to solve the above problem, the present applicant has developed a wire feeder as shown in FIG. 7 (see Japanese Patent Application Laid-Open No. 9-192935). The wire feeder in the immersion type wire electric discharge machine disclosed in the publication is
The sealing structure of the processing tank is simple and the sliding resistance of the processing tank is reduced. The immersion type wire electric discharge machine is
The electric discharge machining of the workpiece 11 is performed by applying a gap voltage between the wire electrode made of the wire 1 and the workpiece 11 to generate electric discharge machining.
Are penetrated through a start hole and a processing slit 39 formed in the workpiece 11. Lower arm 1 provided on head 3
2 is suspended from above the processing tank 2, and the lower arm case 13
Support the lower wire head 9. The processing tank 2 containing the processing liquid 10 is installed on a table 21 mounted on a slide 34, and the workpiece 11 is fixed on the table 21 in the processing tank 2 by a clamp 42. The upper wire head 8 is attached to the head 3 so as to be vertically movable. The lower wire head 9 is provided to face the upper wire head 8. Downstream of the lower wire head 9, a pair of pull-out rollers 17 are provided to pull out the wire 1, which is the waste wire after the workpiece 11 has been subjected to electrical discharge machining, and to make the wire 1 in a tension state.

[0005] A guide roller 14 is rotatably supported by the lower arm case 13. The wire guide pipe 15 extends in the processing tank 2 in an inclined state and opens in the lower arm case 13 and also opens in the upper edge of the processing tank 2. Inlet 33 of wire guide pipe 15 located in lower arm case 13
An air ejection nozzle 30 for injecting fluid into the wire guide pipe 15 is provided to insert the wire 1 through the wire guide pipe 15. The wire extraction roller 17 for extracting the wire electrode 1 is
It is provided near the outlet 32 of the wire guide pipe 15. The pull-out roller 17 is attached to a bracket 5A fixed to the bridge 5 provided on the head 3. In this immersion type wire electric discharge machine, a waste wire hopper 18 is provided adjacent to the machining tank 2. The wire electrode 1 pulled out from the pull-out roller 17 is discharged to a waste wire hopper 18. The processing tank 2 has an overflow passage 2
0 is formed, and the machining fluid recovery passage 29 is connected to the overflow passage 20.

[0006] The processing tank 2 containing the processing liquid 10 is attached to an X-axis table 21 that supports the workpiece 11 in the processing liquid 10. The lower arm 12 is attached so as to hang from the head 3 from above the processing tank 2.
A lower arm case 13 is provided at the end of the second arm 2. The lower wire head 9 that receives the wire 1 that has undergone electrical discharge machining on the workpiece 11 is supported by a lower arm case 13. A guide roller 14 rotatably supported by the lower arm case 13 changes the direction of the wire electrode 1 fed from the lower wire head 9 and guides the wire electrode 1 to the entrance of the wire guide pipe 15.

[0007]

However, in the above-described wire feeder, the wire 1 is not connected to the wire guide pipe 15.
When the wire 1 is pulled out by the pull-out roller 17, the wire 1 is wound around the peripheral surface of the pull-out roller 17, adheres to the wall surface 31 of the waste wire hopper 18 provided on the outlet side of the pull-out roller 17, or enters the gap 36. In some cases, the wire 1 may not be discharged smoothly. In particular, when the wire 1 becomes a thin wire of about 0.07 to 0.15 mm, the wire 1 is not caught by the pull-out roller 17 but stays near the inlet side of the pull-out roller 17 or enters the gap 36. Appears, and the wire 1 is disconnected or the wire 1 cannot be fed.

[0008]

SUMMARY OF THE INVENTION The main object of the present invention is to solve the above-mentioned problems. In order to smoothly discharge waste wires such as fine wires after electric discharge machining of a workpiece, a lower wire head is required. Air is supplied in the wire feed direction only during the rotation of the pull-out roller near the pull-out roller provided on the outlet side of the wire guide pipe disposed downstream, that is, upstream and / or downstream of the pull-out roller. Provided is a wire feeder in a wire electric discharge machine that prevents a wire from being sprayed and adheres to a wall surface of a wire passage or enters a gap, and discharges the wire to a waste wire hopper or the like outside a machining tank accurately and smoothly. It is to be.

According to the present invention, there is provided a wire electric discharge machine provided with a machining tank for applying an inter-electrode voltage between a wire electrode and a workpiece to perform electrical discharge machining on the workpiece. An upper wire head for supplying a wire to the workpiece, a lower wire head disposed below and facing the upper wire head to receive the wire after processing the workpiece, and being unreeled from the lower wire head. A guide roller disposed in the processing tank for guiding the wire, a wire guide pipe disposed in the processing tank for sending out the wire from the guide roller, and an outlet provided near the wire guide pipe; A pull-out roller for pulling out the wire; and a pull-out roller which operates when the pull-out roller rotates to blow air in a discharge direction of the wire. It is composed of air jet nozzles disposed on the periphery of the roller about the wire feed device according to claim.

The air ejection nozzle has a solenoid valve that opens in response to rotation of the extraction roller. The air ejection nozzle is disposed between the wire guide pipe and the pull-out roller, and functions to direct the wire toward the pull-out roller. Furthermore,
The air ejection nozzle is disposed at an outlet side of the extraction roller and functions to direct the wire toward a waste wire hopper.

The wire guide pipe extends in a direction inclined or horizontal in the processing tank so that the downstream side is upward. Further, a guide plate for guiding the wire to a discharge side is provided at an outlet side of the drawer roller.

Since the wire feeder is constructed as described above, in response to the rotation of the pull-out roller, air is blown out of the air blow-out nozzle in the wire feed direction, ie, the traveling direction, and is discharged from the wire guide pipe. Wire is prevented from entering the gap between the wire guide pipe and the draw-out roller, winding around the draw-out roller, or adhering to the wall surface of the guide plate on the outlet side of the draw-out roller, and is smoothly assisted by air blow. Is discharged to a waste wire hopper. In particular, the wire is 0.07 to 0.15 m
Even if the wire is as thin as about m, the wire is reliably pulled out of the wire guide pipe by the pull-out roller, and is reliably discharged to the waste wire hopper with the air. Also,
If the air ejection nozzles are provided on the inlet side and the outlet side of the pull-out roller, the wire is more reliably discharged to the waste wire hopper, and the wire is always successfully fed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a wire feeder in a wire electric discharge machine according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic front view showing an embodiment of a main part of a wire feeder in a wire electric discharge machine according to the present invention, FIG. 2 is a schematic top view showing a main part of the wire feeder of FIG. 1, and FIG. FIG. 4 is a schematic front view showing another embodiment of the main part of the wire feeder in the wire electric discharge machine according to the present invention, and FIG. 4 is a schematic explanatory view of the main part of the wire electric discharge machine incorporating the wire feeder of FIG.

First, an embodiment of a wire feeding device in a wire electric discharge machine according to the present invention will be described with reference to FIGS. As shown in FIG. 4, the wire feeder generally includes an upper wire head 8 provided on a head 3 and supplying a wire 1 constituting a wire electrode to a workpiece 11, and opposed to a lower portion of the upper wire head 8. A lower wire head 9 that is arranged and receives the wire 1 after processing the workpiece 11, a guide roller 14 disposed in a processing tank 2 that guides the wire 1 that is unreeled from the lower wire head 9, and a wire from the guide roller 14. A wire guide pipe 15 is provided in the processing tank 2 for feeding the wire 1, and a drawing roller 17 is provided near the outlet 32 of the wire guide pipe 15 for drawing the wire 1.

As shown in FIGS. 1 and 2, this wire feeder particularly has a wire guide pipe 15 extending in an inclined state in the processing tank 2 and an inlet of the wire guide pipe 15 (corresponding to the reference numeral 33 in FIG. 4). Air ejecting nozzle 30 as a fluid ejecting nozzle toward the outlet, outlet 3 of wire guide pipe 15
2 and an air ejection nozzle 6 provided in a wire feed system between the wire guide pipe 15 and the extraction roller 17. The wire guide pipe 15 connects the entrance 33 to the lower arm case 13.
The outlet 32 is opened at the upper edge of the processing tank 2. The wire guide pipe 15 extends from the lower arm case 13 through the lower arm 12, through the lower arm wall, through the processing liquid 10, and in a state of being inclined above the upper edge of the processing tank 2. The tip is inclined upward so as to protrude from the horizontal plane of the machining liquid 10. Further, the entrance 33 of the wire guide pipe 15 is preferably formed so that the lower part thereof is opened in a trumpet shape so as to easily receive the wire 1, and the wire guide pipe 15 is not provided with a feeding resistance to the wire 1. It is preferable that the upper surface side of 15 extends straight. An air ejection nozzle 30 is provided below the guide roller 14 on the inlet side of the wire guide pipe 15, and air is ejected from the air ejection nozzle 30 so as to guide the wire 1 to the wire guide pipe 15.

This wire feeder is particularly characterized in that an air ejection nozzle 6 is provided near a pair of extraction rollers 17. The pull-out roller 17 is connected to the controller 40.
Is driven to rotate through the rotating shaft 28. The pull-out roller 17 is rotatably supported by a support 4A, and the support 4A is connected to a bridge (reference numeral 5 in FIG. 4) provided on the head 3.
) Is attached to a bracket 5A fixed to the bracket 5A. Further, an air ejection nozzle 6 attached to the bracket 5A is provided around the drawer roller 17 between the support 4 and the support 4A. Air jet nozzle 6
Is controlled so that the solenoid valve 6A is opened in response to a command from the controller 40 when the pull-out roller 17 rotates, and air is blown in the discharge direction of the wire 1. Pull-out roller 1
At the outlet side of 7, a guide plate 25 for guiding the wire 1 to the discharge side is provided, and the guide plate 25 guides the wire 1 sent from the drawing roller 17 to the waste wire hopper 18.

The support 4 supports the end of the wire guide pipe 15 on the outlet 32 side. The support 4 includes the head 3
Is attached via a support flange portion 26 to a bracket 5A fixed to the bridge 5 provided at. Support 4
The distal end of the wire guide pipe 15 is fixed at one end by a plug 38. Wire guide pipe 15
The wire guide nozzle 22 is connected to the end of the wire guide nozzle 22 with a gap, and the wire guide nozzle 23 is connected to the tip of the wire guide nozzle 22 with a gap. Therefore, the wire 1 is connected to the wire guide pipe 15
Is guided by the wire guide nozzles 22 and 23 to the inlet of the pull-out roller 17,
Is securely pinched and pulled out. Further, the working fluid 10 flows downward from the gap between the wire guide nozzles 22 and 23 and flows out from the outlet 24 of the support 4.

The air jet nozzle 6 is disposed between the wire guide nozzle 23 at the end of the wire guide pipe and the pull-out roller 17, and serves to direct the wire 1 toward the pull-out roller 17. The air jet nozzle 6 is connected to a pivot 41
It is pivotally attached to the bracket 5A, and is configured to be adjustable so that proper orientation can be performed. The air is sent from a compressed air source such as a compressor to the air ejection nozzle 6 through the air pipe 27. A solenoid valve 19 may be provided in the middle of the air pipe 27. Connect the solenoid valve 19 to the air pipe 2
7, the solenoid valve 6A incorporated in the air ejection nozzle 6 need not be provided. The solenoid valve 6A is controlled to be opened only during rotation of the pull-out roller 17 in accordance with a command from the controller 40, so that air is blown out from the air blow-out nozzle 6.

Next, another embodiment of a wire feeder in a wire electric discharge machine according to the present invention will be described with reference to FIGS. This embodiment has the same construction as the above embodiment except that an air ejection nozzle 7 is provided downstream of the extraction roller 17, and the wire feeder shown in FIG. Since the wire feeder shown in FIG. 3 is incorporated in the conventional wire feeder shown in FIG.
The same members as those shown in FIGS. 1, 2 and 7 are denoted by the same reference numerals, and redundant description will be omitted.

As shown in FIG. 4, a wire guide pipe 15 disposed downstream of the lower wire head 9 extends in a direction inclined in the processing tank 2 so that the downstream side thereof is upward. The drawing roller 17 is provided so as to face the outlet 32 of the pipe 15. As shown in FIG. 3, the air ejection nozzle 7 is disposed on the outlet side of the extraction roller 17 and includes a solenoid valve 7A.
The solenoid valve 7A of the air ejection nozzle 7 is controlled by the controller 40 in the same manner as the solenoid valve 6A of the air ejection nozzle 6, and transfers the wire 1 to the waste wire hopper 1.
8 is performed. The air is distributed from the compressed air source such as a compressor to the air ejection nozzles 6 and 7 by the branch pipe 16 through the air pipe 27 and sent to the air ejection nozzles 6 and 7. A solenoid valve similar to the solenoid valve 19 may be provided in the middle of the air pipe 27 to the air ejection nozzle 7.

Next, another embodiment of the wire feeder in the wire electric discharge machine according to the present invention will be described with reference to FIGS. This embodiment has exactly the same configuration as the embodiment shown in FIG. 4 except that the wire guide pipe 49 extends in the horizontal direction in the processing tank. Since the wire feeder incorporates the wire feeder shown in FIG.
The same members as those shown in FIGS. 3 and 4 are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 5 shows an automatic wire feeder in a wire electric discharge machine. The automatic wire supply device is configured to be an annealed dry supply system in which an annealed and straightened wire electrode is passed through a start hole without using a water flow. The automatic wire feeder applies the wire electrode 1 fed from the source bobbin 35 to the workpiece 11.
In order to supply to a hole 39 such as a start hole or a processing slit, a wire electrode supply system including various direction changing rollers 37, a tension roller 45, a brake roller 43, a direction changing roller 44, a drawing roller 17, and the like is provided. I have. The lower wire head 47 is supported by the tip of a lower arm attached to the head so as to hang down from above the processing tank, and has a direction change roller 44 inside.
The wire electrode 1 is guided by the upper wire head 46 and the lower wire head 47 and travels accurately with respect to the workpiece 11. In the downstream of the lower wire head 47, a pair of pull-out rollers 17 for pulling out the wire electrode 1 through the wire guide pipe 49 to make the wire electrode 1 in a tensioned state is attached to the outside of the processing tank. In this wire feeder, a wire guide pipe 49 extends in the processing tank in a horizontal direction, and a pull-out roller 17 is provided so as to face the outlet 32 of the wire guide pipe 49. Air ejection nozzles 6 and 7 are provided on the downstream side. Here, since the air ejection nozzles 6 and 7 have the same configuration as that shown in FIG. 3, their description will be omitted.

Next, another embodiment of the wire feeder in the wire electric discharge machine according to the present invention will be described with reference to FIGS. This embodiment is exactly the same as the embodiment shown in FIG. 5 except that a jet flow is supplied to the wire guide pipe 50 from the inlet 53 by a liquid pump or the like and a supply pipe 55 is provided for wire supply. Since the wire feeder shown in FIG. 6 incorporates the wire feeder shown in FIG. 3, the same members as those shown in FIG. And duplicate explanations are omitted.

FIG. 6 shows a wire electric discharge machine equipped with an automatic wire feeder. In the automatic wire electric discharge machine, a wire electrode 1 from a source bobbin is applied to various kinds of rollers such as a direction changing roller and a felt brake roller provided at an upper part of a head of the wire electric discharge machine and a direction changing roller provided at a lower part of the head. The workpiece 11 is supplied to a processing portion of the workpiece 11 through a roller. Further, the wire electric discharge machine includes a cutter 56 for cutting the wire electrode 1 between the lower end of the supply pipe 55 and the holding member 58, a pair of holding members 58 which can be separated from and held for holding or releasing the wire electrode 1. Waste wire clamp for removing the wire electrode 1 cut by the cutter 56,
A guide roller for guiding the wire electrode 1 is provided. The lower wire head 52 provided opposite the upper wire head 51 is provided on the base of the head via a lower arm. The workpiece 11 to be subjected to electrical discharge machining by the wire electrode 1 is set between an upper wire head 51 and a lower wire head 52. The consumed wire electrode 1 discharged from the lower wire head 52 is drawn out and collected by the wire electrode collecting device.

The wire electrode collecting device is composed of the lower wire head 5
2, a direction change roller 54 installed downstream of the direction change roller 54, a wire guide pipe 50 provided downstream of the direction change roller 54, a drawer roller 17 arranged at an outlet 32 of the wire guide pipe 50, and a vicinity of the drawer roller 17. The air jet nozzles 6 and 7 are provided on the upstream and downstream sides. A jet is supplied to the wire guide pipe 50 from an inlet 53 by a liquid pump or the like so that the wire electrode 1 fed from the direction changing roller 54 is sent out on a jet such as a water jet. The direction changing unit 57 houses the direction changing roller 54 and
In addition to supplying the wire electrode 1 from the direction, a water flow is injected from the P direction, and the wire electrode 1 is sent out from the downstream outlet 59 together with the jet flow. One end of the wire guide pipe 50 is connected to the outlet 59, and transfers the water and the wire electrode 1 to the side. The support provided with the water separation unit is connected to the other end of the wire guide pipe 50 to separate and discharge only water and to separate the wire electrode 1 from the air ejection nozzle 6 in the direction of the downstream extraction roller 17. It is configured to feed by. The air jetted from the air jet nozzle 7 provided on the outlet side of the pull-out roller 17 guides the wire 1 to the waste wire hopper 18. The fluid press-fitted in the direction changing unit 57 may be a liquid other than water or another gas.

[0026]

Since the wire feeder in the wire electric discharge machine according to the present invention is constructed as described above, the wire is guided from the lower wire head to the guide roller and fed into the wire guide pipe. Although the wire is sent out from the wire guide pipe, in particular, the wire sent out from the wire guide pipe is securely held by the draw-out roller by the action of the air ejection nozzle, and enters the gap between the wire guide pipe and the draw-out roller. The wire is reliably discharged to the waste wire hopper without winding around the pull-out roller or adhering to the wall surface of the guide plate of the waste wire hopper. . In this wire feeder, air from the air ejection nozzle is not always ejected, but the solenoid valve is opened by the command of the controller in response to the rotation of the extraction roller and the air is ejected from the air ejection nozzle. Thus, it is possible to contribute to energy saving of the air source.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing an embodiment of a main part of a wire feeder in a wire electric discharge machine according to the present invention.

FIG. 2 is a schematic top view showing a main part of the wire feeder of FIG.

FIG. 3 is a schematic front view showing another embodiment of the main part of the wire feeder in the wire electric discharge machine according to the present invention.

FIG. 4 is a schematic explanatory view of a main part of a wire electric discharge machine incorporating the wire feeder of FIG. 3;

FIG. 5 is a schematic explanatory view showing another embodiment of the wire electric discharge machine incorporating the wire feeder of FIG. 3;

FIG. 6 is a schematic explanatory view showing still another embodiment of a wire electric discharge machine incorporating the wire feeder of FIG. 3;

FIG. 7 is a schematic explanatory view showing an example of a wire electric discharge machine incorporating a conventional wire feeder.

[Description of Signs] 1 wire 2 processing tank 3 head 4, 4A support 5 bridge 5A bracket 6, 7 air ejection nozzle 6A, 7A, 19 solenoid valve 8, 46, 51 upper wire head 9, 47, 52 lower wire head Reference Signs List 10 Working fluid 11 Workpiece 12 Lower arm 13 Lower arm case 14 Guide roller 15, 49, 50 Wire guide pipe 17 Pull-out roller 18 Waste wire hopper 19 Solenoid valve 22, 23 Wire guide nozzle 25 Guide plate 27 Air pipe 31 Wall surface 32 Exit 33 Inlet 36 gap 40 controller

Claims (6)

[Claims] 1. A wire electric discharge machine having a machining tank for applying an interelectrode voltage between a wire electrode and a workpiece to perform electrical discharge machining of the workpiece, the wire electric discharge machine being provided on a head and constituting the wire electrode. An upper wire head for supplying a wire to the workpiece, a lower wire head disposed below and facing the upper wire head for receiving the wire after processing the workpiece, and the wire unreeled from the lower wire head A guide roller disposed in the processing tank for guiding the wire, a wire guide pipe disposed in the processing tank for sending out the wire from the guide roller, and the wire provided near an outlet of the wire guide pipe. And a pull-out roller for pulling out the wire, and operating when the pull-out roller rotates to blow air in a discharge direction of the wire to discharge the wire. For this reason, the wire feeder comprises an air jet nozzle arranged near the drawer roller. 2. The wire feeder according to claim 1, wherein the air ejection nozzle includes a solenoid valve that opens in response to rotation of the extraction roller. 3. The air jet nozzle according to claim 1, wherein the air jet nozzle is disposed between the wire guide pipe and the pull-out roller to perform an operation of directing the wire toward the pull-out roller. Wire feeder. 4. The wire feeder according to claim 1, wherein the air ejection nozzle is disposed at an outlet side of the pull-out roller and performs an operation of directing the wire toward a waste wire hopper. 5. The wire feeder according to claim 1, wherein the wire guide pipe extends in a direction inclined or horizontal in the processing tank so that a downstream side is upward. 6. The wire feeder according to claim 1, wherein a guide plate for guiding the wire to a discharge side is provided at an outlet side of the pull-out roller.