JPH01127224A - Wire guide cleaning method for wire cut electric discharge machine - Google Patents

Abstract

PURPOSE:To enhance a success factor of wire automatic supply washing a wire guide by supplying a machining wire or machining fluid in a manner wherein sludge in a guide part of the machining wire is removed after a workpiece is cut. CONSTITUTION:An NC unit 8, after a workpiece 1 is cut by a machining program, successively operates a wire feed means 4 and a machining fluid supplying means 6 respectively continuously for the predetermined time. That is, after a discharge is finished from a power supply unit 7, a machining wire 3 feeds its unused part with no adherence of sludge or the like, generated by the discharge, to a guide hole of a wire guide 23, for instance, for 5sec. Simultaneously injecting machining fluid 25 from a nozzle 29, for instance, for 3min, the sludge, adhering to the guide hole of the wire guide 23 and to its periphery, is washed and removed. And a success factor of wire automatic supply can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for cleaning a wire guide of a wire electrical discharge machining device.

[Conventional technology]

While moving the workpiece on the processing table.

Electric discharge occurs between the workpiece and the machining wire via the machining fluid,
Wire-cut electric discharge machining equipment is mainly used for manufacturing metal presses.

Figure 3 is a configuration diagram of a wire-cut electrical discharge machining device. C is a processing table that is fixed and moves the X-Y coordinate plane.
A sliding part movable in the X-axis direction and a driving means for this sliding part a3. It is composed of a sliding part I that is movable in the X-axis direction, and a moving means for this sliding part a4. (3) is a wire feeding means for feeding the processing wire (3), a wire bobbin ae, a tension roller 11η, a wire feeding roller, or this wire feeding field.
Wire feed motor a1 that drives the wire. It consists of a wire take-up roller (to) for collecting the processed wire (3) after use.

(51 is a wire automatic supply means), the above-mentioned workpiece (1
) Pipe-shaped wire guide located on the upper side °C11l
, a pipe-shaped wire guide drive device (2) that raises and lowers this pipe-shaped wire guide °1211, and a pipe-shaped wire guide °avK below the workpiece (Ill!lc).
It consists of a wire guide (to) and a wire cutter (2) for cutting the processing wire (3), which are arranged to face each other. Next, the sliding part α2 of the processing table (2)
．． The center part of A4 is.

The pair of wire guides (2) are arranged so as to move.

(to) is opened so as not to come into contact with the processing wire (3) passing through. (6) is a machining 'N! between the machining wire (3) and the workpiece (1). This is a machining fluid supply means for supplying L (c), and is composed of a machining fluid tank (to), an F general filter for the machining fluid (c), a pump (to), and a nozzle 4 for spouting machining fluid. (71 is a power supply device that supplies a discharge force to cause a discharge between the machining wire (3) and the workpiece through the machining fluid (c), and the machining wire (3)
is supplied via power supply units 01 and 011. (81 is the processing table (2+, wire feeding) means (4!, automatic wire feeding means (powder).

It is a numerical control device (hereinafter abbreviated as IC device) that controls the machining fluid supply means (6) and the power supply device (71).

Next, the operation will be explained. When starting the machining of the workpiece (11), a command to automatically feed the wire was issued from the No. device (8) when the wire (3) was not passing through the machining start hole of the workpiece 111. In this case, the wire cutter (2) first cuts the excess processing wire (3), and the workpiece +11 on the processing table (2) is moved to the driving means (I).
3# Sliding part a3 with α9. (by driving each of 14), move this workpiece (11) so that the machining start hole 0 is located directly below the pipe-shaped wire guide clD, and then move the pipe-shaped wire guide ° drive device (2) By]
.

The tubular wire guide °QD is lowered to a preset lower limit. Next, when the wire feeding means (4!) composed of wire feeding motor α9 etc. is driven and controlled to feed the processing wire (3), this processing wire (3)
After passing through the machining start hole αB of the workpiece (1) and the wire guide @, it is wound up by the wire winding roller 2, and the loading and unloading of the machining start is completed. Next, the workpiece (1) is placed on the processing table (2) according to the command from the IC device (8).
The position is controlled by moving. On the other hand, the wire feeding means (4!) is driven to feed the processing wire (3), and the pair of wire guides @
, (c) to guide the feeding by vertically supporting the machining fluid supply means (61) between the machining wire (3) and the workpiece.
The pump (to) is driven to inject machining 1fi, @ from the tip of the nozzle (to), and a pulsed voltage is applied via the power supply unit (to) and eD to the power supply (by 71). y), discharge the above machining fluid (y) as a discharge medium,
This discharge energy! D. The workpiece (1) is cut into the shape of the command hole of the No. 81 machine.

[Problem that the invention seeks to solve]

In the wire-cut electric discharge machining apparatus configured as above, when cutting the workpiece (1) as described above, the machining wire ( Sludge etc. generated by the electric discharge machining accumulates on the wire guide (to) through which the wire (3) passes, making it difficult for the machining wire (3) to pass through the hole in the wire guide (2) at the start of the 9th machining. There was a problem in that it was difficult to automatically supply the cutting wire.

This invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a method for cleaning a wire guide of a wire-cut electrical discharge machining machine that automatically cleans the wire guide after the cutting process in the previous stage. shall be.

[Means for solving problems]

A method for cleaning a wire guide of a wire-cut electric discharge machining apparatus according to the present invention is used in a wire-cut electric discharge machining apparatus that cuts a workpiece by causing an electric discharge between a machining wire and a workpiece through a machining fluid.

The processing wire or processing fluid is supplied to remove sludge from the guide portion of the processing wire during cutting of the workpiece.

[Effect]

In this invention, the cutting of the workpiece by electric discharge is also carried out by feeding the machining wire and passing the machining wire that is not subjected to electric discharge machining through the wire guide hole.

This machining section cleans the wire guide 0 by supplying machining fluid, thereby removing sludge and the like generated by electrical discharge machining and accumulated on the wire guide 0.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The hardware of the wire-cut electrical discharge machining apparatus in this example is the same as the conventional example shown in FIG. 3, so illustration is omitted, but the hardware is indicated by the same reference numerals as in the conventional book shown below. is the same as that of the conventional example.

This embodiment uses a method in which, after cutting the workpiece (1) using the cutting program, the wire feed means (4) and the machining fluid supply means (6) are each continuously operated for a predetermined period of time. That is, after the electrical discharge for the cutting process is completed, the unused part of the machining wire (3) to which sludge generated by the electrical discharge has not adhered is the wire guide disposed directly below the electrical discharge machining section. For example, the processing wire (3) is fed for 5 seconds so as to pass through the guide hole (C), and the processing liquid (C) falling along the processing wire (3) is used to guide the wire. In order to clean and remove the sludge adhering to the guide hole and its surroundings, the wire guide (to) is cleaned by spraying the machining liquid (c) for, for example, 3 minutes. ], the timer means for continuing the operation of the wire feed means (4!) and the machining fluid supply means (61) for a predetermined time is connected to the NO device IBs.
The wire guide is built into a cleaning program stored in its memory.

Figure 1 is a flowchart of the wire guide ° cleaning program that is executed following the cutting of the workpiece (1) by execution of the cutting program, and Figure 2 is a flowchart of the wire guide cleaning program (4!
, machining fluid supply means (61, etc.), and this embodiment will be described below in accordance with the flowchart of FIG. 2.

The wire guide cleaning program shown in the flowchart of FIG. 1 is repeatedly called and executed by the upper routine (control program) &C after the execution of the heating program is completed.

In the figure, first, it is determined whether the time is immediately after the end of the above-mentioned Canadian program (step (51)),
If YE 8, set the flag (ON) (step (52)) and clear the timer, that is, set the timer value C to O.
K (step (53)). Next, it is determined whether or not the flag is ON (step (54)), and if it is ON, it is determined whether or not the primary rotation operation is in progress, that is, whether the above-mentioned Nitrogram has been restarted or not. Step (55)
) If automatic operation is not in progress, determine whether or not the supply of the next busy machining fluid (c) is turned off (step (56))
I If the supply of the machining fluid (2) is not OFF, the above-mentioned timer is checked and updated as shown below.

First, it is determined whether or not the timer value C of the timer is 0 or more (step (57)), and if it is 0 or more, processing is turned off.
In other words, a command to stop discharging is issued to the power supply device (71) (step (58)).Next, it is determined whether the above-mentioned timer value is 5 seconds or more (step (59)), and the timer value is determined to be 5 seconds or more. In the case of , wire feed of processing wire (3), 9OFF・
In other words, the wire feeding means 9 (4!) is commanded to stop driving (step (60)).

Next, it is determined whether or not the timer value is 3 minutes or more (step (61)), and if the timer value is 3 minutes or more, a command is issued to turn off the supply of machining fluid (2), that is, the pump of machining number supply means (61) (to) is commanded to stop (step (62)).

Next, the timer value C of the timer is updated, including when the determination in step (61) is NO.

In other words, the timer value CIC is the value B corresponding to the one-time processing time of this program that is repeatedly executed by the upper routine.
Add (step (65)) #To upper routine l+
Turn (step (66)). This program is executed repeatedly due to high-level routines.

From the second execution, the determination at step (51)K is NO, and the process proceeds to step (54). If the flag is OFF in step (54), it means that the Kani program is being executed, so the process returns to the upper routine (step (s6)).

Is this flag OF? (In step (54)).

If automatic operation is in progress (step (55)), this means that machining of the workpiece (No. 11) by the above-mentioned cutting program has been restarted during the execution of this wire guide cleaning program, so the above-mentioned flag is set. reset i.e. 0
7FVC1- (step (64)), timer 11 is set (step (65)), and the process returns to the upper routine (step (66)). If machining QOFF is set in step (56), that is, if a machining fluid OFF command was issued in step (52) in the previous execution of this program, the above flag and timer are set to 11. (Steps (54), (65)) Make a 1J turn to the upper routine (Step (66)).

The execution result of the above Wire Guy V cleaning program is shown in Figure 3a.
4611C, the end of the Canadian program (third
At the same time as Figure a), the machining will stop and Figure 3B).

After 5 seconds, the machining wire feed stopped (Fig. 3C).

Three minutes after the end of the above-mentioned cannibal program, the supply of the machining fluid is stopped.

In the above embodiment described using the flow chart shown in FIG.
The tie 1 function was obtained by constructing a C module and repeatedly calling and executing this program using a higher-level routine, but the same effect can be obtained by using a normal timer device. For example, a two-minute timer device is used, and the two timer devices are set at the end signal of the Niprogram.

For example, when the first timer turns on after a set time of 5 seconds, this signal is used to stop the wire feeding means (ship operation), and when the second timer turns on after a set time of 3 minutes, the processing fluid supply means The operation in step (6) is stopped and the two timer devices mentioned above are reset to end the process.However, if the execution of the above program is restarted midway through, the timer device is immediately set to 11.The same effect can also be obtained by using the above method. is obtained.

In the above embodiment, the machining wire (3) was fed for 5 seconds and the machining fluid (c) was supplied for 3 minutes after the end of the Ni program. It is not necessary to limit the process to the above, and the process may be modified in consideration of the degree of cleanliness required for practical use, the consumption of the machining wire (3), and the economic loss due to non-machining time of this wire-cut electric discharge machining device. .

Further, in the above embodiment, after the end of the cutting program, the feeding of the processing wire (3) and the supply of the processing ffL@ were continued for a predetermined period of time, but the feeding of the processing wire (3) and the supply of the processing wL@ The supply may be intermittent or may be performed at two intervals.

Furthermore, in the above embodiment, the feeding of the machining wire (3) and the supply of the machining fluid (c) were carried out at the same time during the first predetermined period of time 0, for example, 5 seconds after the end of the cannibal program, to obtain a synergistic effect. A corresponding effect can be obtained even if these steps are carried out independently.

In the wire-cut electrical discharge machining apparatus shown in Fig. 3, an example is shown in which the machining fluid (2) is injected only from the machining fluid spray nozzle (2) disposed above the workpiece (1). However, the injection position of the machining fluid (c) is not limited to the above-mentioned example. A nozzle (not shown) is incorporated.

Also in the case of a device of the type that injects the machining liquid to the workpiece (11) from below along the machining wire (3).

This invention may be implemented.

〔Effect of the invention〕

As mentioned above, according to this FJAK, the machining wire or machining fluid is supplied after cutting the workpiece by executing the Kani program, so the wire guide is cleaned and the success rate of automatic wire supply is improved. It has the effect of

[Brief explanation of the drawing]

Fig. 1 is a flowchart of a wire guide cleaning program for a wire-cut electrical discharge machining device that implements an embodiment of the present invention, and Fig. 2 explains the functions of the wire feed means, machining fluid supply means, etc. after the end of the cutting program. FIG. 3 is a block diagram of a wire-cut electric discharge machining apparatus according to an embodiment of the present invention. In the figure, (1) is the workpiece, 7 (21 is the processing table, (3) is the processing wire,
((( is wire feeding means. +51 i1 wire automatic supply means, (6) is machining fluid supply means. (71 is power supply device, (8) is NO device (numerical control device)
. ci3 is wire guide, c! 9 indicates a processing fluid. Note that in the two figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a wire-cut electrical discharge machining device that cuts the workpiece by causing electrical discharge between the workpiece and the workpiece via a machining fluid, sludge on the guide portion of the workpiece is removed after cutting the workpiece. A method for cleaning a wire guide of a wire-cut electrical discharge machining apparatus, characterized in that the machining wire or machining fluid is supplied as described above.