JPH01321126A - Wiring device for wire type electric discharge machine - Google Patents

Abstract

PURPOSE:To have smooth and sure wiring of a processing wire by changing the wire advance direction from the exhaust part so as to pass through a pipe, blowing a gas into this pipe, blowing off the liquid therein, and at the same time applying vibration to the wire. CONSTITUTION:At the time of wiring, a processing wire X is introduced to a guide B by hand from a supply part A and threaded into an upper wire guide 58, a hole (y) in a work Y, a lower guide 17, a conductive pin 18, and a wire guide 19 while a wiring liquid is jetted to a pipe 57, and sent into a pipe 2 with the direction changed by a pulley 10 of a heading change device 1. At this time, air is blown in from a blow-in hole 12 so as to blow off the water dropping, and also the wire X is vibrated, not being set off from a guide groove 11, and is advanced in the pipe 2 smoothly by the gas blown into it from a gas blow-in device 3 to reach an exhaust roller 4 from an adjust pipe 5, and is bitten and exhausted to an exhaust wire box 9. Thus wiring of the processing wire can be made smoothly and certainly.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a wire connection device for a wire electrical discharge machine.

<Conventional technology> A wire electrical discharge machine first creates a minute hole in the workpiece (workpiece), passes a wire through this hole, and performs machining by causing electrical discharge between the wire and the workpiece while feeding the wire. It is. A device called a wire connection device is used to pass the wire through the hole in the workpiece.

The wire connection device, the configuration of which is shown in FIG. 6, basically consists of a wire supply section A, a wire guide section B, and a wire discharge section C. The wire supply section A includes a wire bobbin 50 on which wire is wound, a cylindrical roller 51, a guide 52. Tension roller 53, felt 54. Disconnection detection limit switch 55. It is composed of a pulley 56 and the like, and is configured to sequentially feed out the wire while applying a predetermined tension to the wire.

The wire guide section B is for passing the wire through the hole y of the workpiece Y, and is composed of a pipe AWT 57, an upper wire guide 58, and a lower guide 59. Pipe AW
T57 has a pipe that can be raised and lowered along with a feed roller that sends the wire inside, and the wire is stored in this pipe, and the pipe and wire are lowered at the same time to pass through the hole y and lowered to the lower guide 59. . Then, after passing the wire to the wire discharge section C, only the pipe is pulled up and the wire is sent to the wire discharge section C. The wire is horizontally changed direction by a pulley 60 of the wire discharge section C, passed through the vibro 1, sucked by a suction device 62, and discharged from a wire discharge port 64 to a discharge wire box 65 via a discharge roller 63. .

When connecting wires, the pipe AWT 57 is configured to supply a large amount of connection liquid such as water into the pipe so that the wire can be smoothly and easily transferred within the pipe. A suction device 62 is provided to maintain the effect of the water flow.

Further, the upper wire guide 58 is configured to supply machining fluid during electrical discharge machining.

<Problems to be Solved by the Invention> In the conventional wiring device as described above, an accident occurs in which the wire gets caught at the entrance of the suction device 62 and does not enter the suction device 62, resulting in a wiring mistake. there were. In recent years, with the advancement of machine automation, it is often the case that many holes are made in the same workpiece and electrical discharge machining is performed one after another.In such cases, if a wiring mistake occurs, subsequent work will stop completely. There is.

An object of the present invention is to solve the problems of the conventional wiring device described above.

<Summary of the Invention> As a result of conducting various experimental studies to solve the above-mentioned problems, the present inventors found that the reason why the wire gets caught at the entrance of the suction device 62 is because the wire is stretched against the inner wall of the vibro 1 inside the vibro 1. We came to the conclusion that this was due to damage to the pipe or damage to the inner wall of the pipe. Furthermore, it has been found that the reason why the wire sticks to the inner wall of the vibro 1 is that the connection fluid in the pipe AWT 57 and the processing fluid in the upper wire guide 58 enter the inside of the vibro 1 and wet the inner wall of the vibro 1.

The present invention was made based on such findings, and provides a wire discharge unit that includes a wire supply unit that supplies a wire, a wire guide unit that allows the wire to pass through a workpiece, and a discharge unit that discharges the wire that has passed through the workpiece. In a wire connection device for a processing machine, the discharge section includes a direction changing device for changing the traveling direction of the wire, a pipe for passing the direction-changed wire, and a gas blowing device for blowing gas into the pipe.

The basic feature is that the wire discharge roller is provided on the exit side of the pipe.

Effect> In the above configuration, gas such as air is blown into the pipe 2 from the gas blowing device 3 instead of suction by the conventional suction device 62. This gas blows away the liquid inside the pipe and prevents the inner walls of the pipe from getting wet. Furthermore, the blown gas gives vibration to the wire, thereby improving the wire passage.

<Example> Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, the wire supply section A and the wire guide section B have the same structure as the conventional structure shown in FIG. 6.

A lower guide 17 facing the upper wire guide 58 with the workpiece Y in between is provided, and the pipe AWT 5 described above is
After the pipe in 7 is lowered to the position of this lower guide 17 and the wire X is introduced into the lower guide 17, it is in a configuration in which it is allowed to play.

The wire discharge section C provided below the lower guide 17 includes a direction changing device 1, a pipe 2, a gas blowing device 3, a discharge roller 4, an adjustment pipe 5, and the like. The direction changing device 1 is composed of a pulley 10 and a guide groove 11, and as shown in FIGS. 3 and 4, the wire It is configured to change the direction of travel. In this embodiment, an air blowing hole 1 is provided at the apex of the curve R of the guide groove 11.
2 is formed, and an air blowing device (not shown) is connected thereto to blow air into the guide groove 11 from the air blowing hole 12.

As shown in FIG. 4, the air blowing hole 12 opens not at the bottom of the guide groove 11 but at a position slightly removed from the bottom, so that the air blowing is not obstructed by the wire X. By blowing air into the guide groove 11 in this way, the turbulence of the water flow falling into the guide groove 11 causes the wire
It is possible to prevent it from deviating from 1. Furthermore, by blowing air, the wire X can be vibrated to improve its passage performance. Note that a wire guide 19 and a current-carrying pin 18 are provided on the upper part of the pulley 10.

A pipe 2 is arranged substantially horizontally on the exit side of the pulley 10 and the guide groove 11. Inlet of pipe 2 and pulley 10,
There is a slight distance between the guide grooves 11, and the pipe AWT5
7. The structure is such that the liquid falling from the upper wire guide 58 is unlikely to enter the inside of the pipe 2. pipe 2
A gas blowing device 3 is installed approximately in the middle. As shown in FIG. 2, this gas blowing device 3 has an annular box shape attached to the outer periphery of the pipe 2.
It is attached to the outer circumferential surface of the O-ring 30 via an O-ring 30 to form a sealed space. A hole 20 is formed in the wall of the pipe 2 within this space.

A gas such as air is blown into the pipe 2 from here. The gas blowing device 3 is connected to a gas source and a perturbation source (not shown) such as a pump, and blows gas into the pipe 2 through the hole 20 at a predetermined pressure. By blowing this gas, moisture inside the pipe 2 is blown away, and the inner wall 21 can be maintained in a dry state. Further, the blown gas causes the wire X to vibrate as shown in the figure, and this vibration can prevent snagging and improve passing performance. The installation position of the gas blowing device 3 does not have to be at the midpoint of the pipe 2;
A predetermined effect can be obtained no matter where it is placed in the throat.

An adjustment pipe 5 and a discharge roller 4 are provided on the exit side of the pipe 2. The adjustment pipe 5 is placed around the outer periphery of the pipe 2 and has a constricted portion 40 at its tip, and is configured to smoothly introduce the tip of the wire X into the discharge roller 4.

The discharge roller 4 consists of a pair of upper and lower rollers, and in this embodiment, the surface thereof is made of ceramics so that the tip of the wire X can be caught easily. A wire discharge port 8 and a discharge wire box 9 are provided on the exit side of the discharge roller 4, from which the wire X is discharged.

In the above configuration, during connection, the wire X is manually transferred from the wire supply section A to the wire guide section B, and at the wire guide section B, the wire X descends in synchronization with the pipe and passes through the hole y of the workpiece Y. and reaches the lower guide 17. Then, wire X is sent while jetting connection fluid into the pipe. At the same time, the connection liquid flows from the upper wire guide 58 to the outside of the pipe to eliminate turbulence in the water flow at the tip of the pipe. From this, the tip of the wire X passes through the current-carrying pin 18, the wire guide 19, the guide groove 11, and changes its traveling direction horizontally at the position of the pulley 10. At this time, the R of the guide groove 11
Since air is blown into the area from the air blowing hole 12, the falling water is blown away, and the wire X will not come off from the pulley 10 or the guide groove 11 due to turbulence in the water flow.

Moreover, the wire X vibrates due to the air blowing, thereby preventing it from getting caught.

The wire X coming out of the pulley 10 and the guide groove 11 enters the pipe 2 and advances therein. Since gas is blown into the inside of the pipe 2 from the gas blowing device 3, the inner wall 21 thereof is not wet and the wire X does not stick to the inner wall 21. In addition, since the wire X vibrates due to the blown gas, it smoothly moves through the pipe 2 and reaches the adjustment pipe 5 without getting caught. Since the adjust pipe 5 is covered with the pipe 2 from the outside, and the wire X is vibrating, the wire X is not locked at the joint between the pipe 2 and the adjust pipe 5.The wire X is connected to the adjust pipe. The wire is guided to the constriction part 40 of No. 5, reaches the discharge roller 4, is caught there, and is discharged from the wire discharge port 8 to the discharge wire box 9.

As described above, the wires X can be connected smoothly, and connection failures will not occur.

Next, FIG. 5 shows another embodiment.

In this embodiment, the pipe 2 is divided into two parts, and a pulley 10,
The second pipe 2' is arranged on the guide groove 11 side. The pipe 2 and the second pipe 2' are connected by a funnel-shaped connecting portion 25 at a distance.

This second pipe 2' is also provided with a gas blowing device 3', which blows away moisture inside the second pipe 2' and also applies vibration to the wire X.

According to the above configuration, even if the liquid falling from the upper part enters the second pipe 2', the liquid flows from the connecting part 25 even though the pipe 2 and the second pipe 2' are separated at the connecting part 25. is discharged. Therefore, the amount of liquid that enters the inside of the pipe 2 is extremely small.

The dryness of the inner wall 21 of the pipe 2 is improved. Also.

The second pipe 2' is also blown with gas by the gas blowing device 3', and since the length of this pipe 2' is short, the liquid can be discharged extremely efficiently. It also improves the dryness inside. In addition, in the above, 2
Although the pipe 2 is divided into parts, the pipe 2 may be divided into as many parts as necessary.

As explained above, in the above structure, the gas blowing device 3 is provided in the pipe 2 in the wire discharge section C, and gas is blown from there, so that the wire X can move extremely smoothly and the connection can be reliably realized. In addition, since gas is also blown into the guide groove 11 from the air blowing hole 12,
Accidents such as the wire X coming off from the pulley 10 and the guide groove 11 can also be prevented. In addition, in the embodiment shown in FIG.
Since it is divided, the liquid can be drained smoothly and the reliability of the wiring can be improved. Furthermore, unlike the conventional configuration shown in FIG. 6, there is no need to provide a suction device 62, so problems such as wire debris accumulating at the joint between the suction device suction device 62 and the vibro 1 do not occur.

<Effects of the Invention> As explained above, the present invention provides wire electrical discharge machining that includes a wire supply section that supplies a wire, a wire guide section that passes the wire through a workpiece, and a discharge section that discharges the wire that has passed through the workpiece. In the wire connection device in the machine, the discharge section includes a direction changing device for changing the traveling direction of the wire, a pipe for passing the changed direction wire, a gas blowing device for blowing gas into the pipe, and an outlet side of the pipe. Since the wire discharging roller is provided, there is an effect that the wire can be connected very smoothly and reliably without the wire getting caught.

[Brief explanation of the drawing]

Fig. 1 is a front view showing one embodiment of the present invention, Figs. 2 to 4 are partially enlarged views thereof, Fig. 5 is a partial front view showing another embodiment, and Fig. 6 is a conventional configuration. FIG. Direction changing device, 2: Vipe, 3: Gas blowing device, 4:
Discharge roller, 5 near mast pipe, 8: wire discharge port, 9: discharge wire box, 1°: pulley, 11 guide groove, 12: air blow hole, 17: lower guide, 18:
Current-carrying pin, 19: wire guide, 20: hole, 21: inner wall, 25: connecting part, 30: 0 ring, 50: wire bobbin, 51: cylindrical roller, 52 guide, 53: tension roller, 54: felt, 55: wire breakage Detection limit switch, 56: Pulley, 57: Pipe AWT, 58: Upper wire guide, 59: Lower guide, 60: Pulley, 61
: Pipe, 62: Suction device, 63: Discharge roller, 64:
Wire discharge port, 65: discharge wire box. Applicant Attic Engineering Co., Ltd. Agent Patent attorney Kiyoshi Takahashi and 1 other person Figure 2 Figure 3 C Figure 6

Claims (1)

[Scope of Claims] A wire connection device for a wire electric discharge machine comprising a wire supply section that supplies a wire, a wire guide section that passes the wire through a workpiece, and a discharge section that discharges the wire that has passed through the workpiece; The section includes a direction changing device for changing the traveling direction of the wire, a pipe for passing the direction-changed wire, a gas blowing device for blowing gas into the pipe, and a wire discharge roller provided on the exit side of the pipe. A wire connection device for a wire electrical discharge machine, characterized by having the following.