JPH04193422A - Wire electric discharge machining device - Google Patents

Abstract

PURPOSE:To enlarge withdrawal capacity for wire by providing a wire melting means to melt a wire electrode passed through a working position and fed to a withdrawal position, and a melting command means to command to intermittently actuate the wire melting means. CONSTITUTION:When a wire electrode 11 is passed through the hollow part 201a of a cylindrical body 201 of a wire electrode melting part 200, a switch 204 is intermittently opened and closed based on the command of a melting command part 205, and high frequency current is intermittently let flow in a coil 202 from an electric power source 203. When the high frequency current flows in the coil 202, eddy current is induced in the wire electrode 11 fed through the hollow part 201a of the cylindrical body 201, and the wire electrode 11 is heated and melted by the eddy current. The high frequency current flows in the coil 202 intermittently, the wire electrode 11 is fed through the hollow part 201a of the cylindrical body 201 at a prescribed speed with a wire electrode feeding roller 15, and hence the wire electrode 11 is melted by a prescribed length and withdrawn into a wire electrode recovery vessel 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a wire electrical discharge machining apparatus having a wire electrode collection container for collecting a wire electrode that has passed through a processing position.

[Prior Art] Fig. 5 is a block diagram showing an overall outline of an example of a conventional wire electric discharge machining apparatus, and Fig. 6 is an enlarged view of the wire electrode collection section of the wire electric discharge machining apparatus shown in Fig. 5. FIG. 2 is a detailed configuration diagram shown in FIG.

In FIG. 5, (1) is a pedestal, and (2) is an X-Y table drive mechanism fixedly supported by the pedestal (1).

(3) is an X-Y table that is supported by an X-Y table drive mechanism (2) so as to be movable in the left-right direction of the page and in the front-back direction of the page, and (4) is fixedly supported by the X-Y table (3). The workpiece mounting bracket (5) is a workpiece fixedly supported by the workpiece mounting bracket (4). (6) is a column supported by pedestal (1).

(7) is an upper arm supported by the column (6); (8) is an upper nozzle supported by the upper arm (7) in a vertically movable manner;
(9) is a lower arm supported by column (6).

(10) is the lower nozzle supported by the lower arm (9), (
11) is a wire electrode; (12) is a wire electrode supply bobbin rotatably supported by the upper arm (7) and around which the wire electrode (11) is wound; (13) is the upper arm (7)
A pulley that is supported by and changes the feeding direction of the wire electrode (11).

(14) is supported by the lower arm (9) and the wire electrode (11
), (15) is the pulley that changes the feeding direction of the lower arm (
Wire electrode feeding means 1 supported by 9) and feeding the wire electrode (11) in one rotation is, for example, a wire electrode feeding roller. (16) is a motor that is supported by the lower arm (9) and rotates the r-wire electrode feeding roller (15).

(17) is the pinch roller, (18) is the lower arm (9)
(19) is a compression spring whose one end is supported by the lower arm (9); (20) is a compression spring whose one end is rotatably supported by the rotation shaft (18); This is a pinch roller arm that rotatably supports the roller (17) and whose other end is pressed toward the wire electrode feeding roller (15) by the other end of a compression spring (19). The other end of the pinch roller arm (20) is the wire electrode feeding roller (I5)
When pressed to the side by the compression spring (19), the pinch roller (17) is pressed against the wire electrode feeding roller (15) with the wire electrode (11) sandwiched therebetween. As a result, slippage between the wire electrode (11) and the wire electrode feeding roller (15) is prevented. (21) is a wire electrode collection container for collecting the wire electrode (11), and (22) is a pair of restraints rotatably supported by the upper arm (7)! First, the operation of the conventional device will be explained. Prior to processing, one end of the wire electrode (11) pulled out from the wire electrode feeding bobbin (12) is connected to the control roller (22).
.

Pulley (13), upper nozzle (8), machining start hole (5a) previously drilled in workpiece (5), pulley (
14), the wire electrode (1) is passed through the wire electrode feeding roller (15) and onto the wire electrode collection container (21).
1) Stretch it. Next, the machining liquid is injected from the upper nozzle (8) and the lower nozzle (10) to the machining position of the workpiece (5), and the machining liquid is intermittently sprayed between the wire electrode (11) and the workpiece (5). Machining is proceeded by applying voltage from a power source (not shown) to generate electric discharge and moving the workpiece (5) via the X-Y table (3).

At this time, since the wire electrode (11) is damaged by the discharge, the wire electrode feeding roller (15) is rotated based on the rotation of the motor (16).

The wire electrode (11) is fed from the wire electrode feeding bobbin (12) toward the wire electrode collection container (21) at a predetermined speed.

[Problem to be solved by the invention] In conventional wire electrical discharge machining equipment as described above.

The wire electrode (11) that has passed through the processing position is directly sent to the wire electrode collection container (21).
11) will be collected in a bulky state into the wire electrode collection container (21). Therefore, even if a wire electrode collection container (21) with a large shape is prepared, the wire collection capacity is low.
Furthermore, if the wire electrode collection container (21) is automatically replaced, there are problems in that the device becomes expensive and large.

Furthermore, as shown in Japanese Unexamined Patent Publication No. 56-89441, there is a method of mechanically cutting the wire electrode (11) into short pieces and collecting them, but since this method is mechanical cutting, vibrations generated during cutting are This is transmitted to the wire electrode (11), reducing processing accuracy, and the blade for cutting the wire electrode (11) is abraded, resulting in poor reliability and durability.

This invention was made to solve the above-mentioned problems, and even if the wire electrode collection container (21) has a small shape, it has a large wire collection capacity, can process with high processing accuracy, and has high reliability. and to obtain a durable wire electrical discharge machining device.

"Means for Solving the Problems" A wire electrical discharge machining apparatus according to the present invention includes a wire electrode feeding means for feeding a wire electrode, and a wire electrode fed by the wire electrode feeding means, passing through a processing position and returning to a collection position. a wire fusing means for fusing the fed wire electrode; a fusing command means for giving a command to intermittently operate the wire fusing means;
It is designed to have the following.

[Operation] The wire electrical discharge machining apparatus configured as described above fuses and collects the wire electrode that passes through the processing position and is fed to the first collection position.

[Embodiment of the Invention] Fig. 1 is a block diagram showing an overall outline of a wire electrical discharge machining apparatus showing an embodiment of the invention, and Fig. 2 shows an enlarged view of the wire electrode collection section of Fig. 1. FIG. In FIG. 1, (200) is a wire fusing means 1, for example, a wire electrode fusing part, which fusing the wire electrode (11) that has passed through the processing position and is fed to the collection position 9, and this wire electrode fusing part is located at the bottom. It is supported by an arm (9). In addition, (1) to (22) are shown in FIGS. 5 and 6 showing conventional examples.
Since it is similar to (1) to (22) shown in the figure, the explanation will be omitted.

In Fig. 2, (201) is supported by the lower arm (9), and the wire electrode (11) passed between the wire electrode feeding roller (15) and the pinch roller (17) enters from one end and exits from the other end. It is a cylindrical body arranged so that it comes out and is collected in a wire electrode collection container (21). Note that this cylindrical body (201) is made of an insulator. (20
2) is a coil wound around a cylindrical body (201).

(203) is a power supply that outputs high frequency current, (204
) is a switch connected in series to a series body of a coil (202) and a power supply (203). (2[)5) is
A fusing command means 1, for example, a fusing command section, which instructs whether or not to melt the wire electrode (11) via this switch (204). In addition, 1 cylindrical body (201), coil (20
, 2), a power source (203), and a switch (204) constitute a wire electrode fusing section (200).

Next, the operation of one embodiment of the present invention will be explained. Prior to machining, one end of the wire electrode (11) pulled out from the wire electrode feeding bobbin (12) is connected to the restriction roller (22), pulley (13), upper nozzle (8), and the workpiece (5) in advance. Processing disclosure hole (5a) drilled in
), pulley (14), wire electrode feeding roller (15),
The wire electrode (11) is stretched so as to reach the wire electrode collection container (2I) through the hollow part (201a) of the cylindrical body (201) of the wire electrode fusing part (200). Next, as in the conventional example, machining liquid is jetted from the upper nozzle (8) and the lower nozzle (1o) to the machining position of the workpiece (5), and the wire electrode (11) and the workpiece (5) are connected to each other. During this period, a voltage is intermittently applied from a power supply to generate electric discharge and the workpiece (5) is moved via the X-Y table (3), thereby proceeding with machining. At this time, the wire electrode (11)
is damaged by electric discharge, so the wire electrode (11) stretched as described above is transferred to the wire electrode feeding bobbin (12) by the rotation of the wire electrode feeding roller (15) based on the rotation of the motor (16). From the wire electrode collection container (21
) at a predetermined speed.

Now, in one embodiment of the present invention, a wire electrode (1
1) is the cylindrical body (201) of the wire electrode fusing part (200)
When passing through the hollow part (201a) of the fusing command part (201a),
The switch (204) opens and closes intermittently based on the commands of the coil (205), and the high-frequency current from the power source (203)
02) is played intermittently. The high frequency current flows into the coil (20
2), the hollow part (201a) of the cylindrical body (201)
), an eddy current is induced in the wire electrode (11) that is fed through the wire electrode (11).
) is heated and fused. A high frequency current flows intermittently through the coil (202) as described above.

The wire electrode (11) is fed into the hollow part (201a) of the cylindrical body (201) at a predetermined speed by the wire electrode feeding roller (15).
Since the wire electrode (11) is fed through the wire electrode collection storage 1 (21) in a state where the wire electrode (11) is fused to a predetermined length,
will be collected.

In one embodiment of the invention described above, a wire electrode (1
1), an eddy current is induced and the wire electrode (11) is melted by this eddy current; however, the present invention is not limited to this, and FIG. Similarly, the wire electrode (11) may be fused with a high-temperature flame.

In FIG. 3, (300) is a wire electrode fusing part that fuses the wire electrode (11) that has passed through the processing position. This wire electrode fusing part (300) is shown in FIGS.
This corresponds to the wire electrode fusing section (200) in the figure. (301) is a blowing means, and (302) is a fuel container.

(303) is a liquid fuel stored in a fuel container (302); (304) is a pipe (304a), a pipe (304b), and a pipe (304c) whose ends are connected to each other at a connection point (3o4d); It is a branch pipe consisting of. The other end of the pipe (304a) is the ventilation means (
301).

Wind is blown by the air blowing means (301). Also.

The other end of the pipe (304b) is arranged to be submerged in the liquid fuel (303). The wind blown from the other end of the pipe (304a) by the blowing means (3 (11)) sucks up the liquid fuel (303) from the fuel container (302) through the pipe (304b), and also blows this liquid fuel (
303) is atomized and discharged from a hole (304e) provided at the other end of the pipe (304c).

(305) is a power source, and (306) is a heat generating conductor that is provided near the hole (304e) and generates heat when energized by the power source (305). The atomized liquid fuel (303) discharged from the hole (304e) is ignited by this heating conductor (306) and becomes a high-temperature flame. (307) is supported by the lower arm (9).

Wire electrode feeding roller (15) and pinch roller (1
7) is a cylindrical body arranged so that the wire electrode (11) that has passed through the space enters from one end, exits from the other end, and is collected in the wire electrode collection container (21). The above-mentioned high-temperature flame is blown through the hole (307a) provided in the cylindrical body (307) to the wire electrode (11) that is being fed through the hollow part (307b) of the second cylindrical body (307). It will be done. As a result, the wire electrode (11) is heated and fused.

(308) connects the wire electrode (
11) is a fusing command unit that instructs whether or not to melt.

Note that the wire electrode fusing part (300) is connected to the blowing means (301).
), fuel container (302), liquid fuel (303), branch pipe (304), power source (305), heating conductor (306)
, and a cylindrical body (307).

Next, the operation of another embodiment of the invention shown in FIG. 3 will be described. The fusing command part (308) is the blower means (3
01) to operate the blower means (301) intermittently. When the blowing means (301) operates intermittently,
A high temperature flame is intermittently emitted from the hole (304e) to the wire electrode (11).
) and melts the wire electrode (11). On the other hand, since the wire electrode (11) is fed at a predetermined speed by the wire electrode feed roller (15) during processing, the wire electrode (11)
11) is cut to a predetermined length, and the wire electrode collection container (21) is cut to a predetermined length.
) will be collected.

Further, in another embodiment of the present invention shown in FIG. 3, the high-temperature flame is caused by atomized liquid fuel (303), but is not limited to this, and may be caused by gaseous fuel. . Furthermore, the blowing means (308)
1) to fuse and cut the wire electrode (11), but the present invention is not limited to this; a solenoid valve (not shown) is provided on the pipe (304c), and commands are given to open and close the solenoid valve. The blowing means (301) may be left operating during this time.

In addition, the second heating conductor (306) is connected to the hole (3) of the pipe (304).
04e) may be arranged outside.

In addition to the method of fusing the wire electrode (11) using eddy current or high-temperature flame as shown in FIGS. 2 and 3, as yet another embodiment of the present invention, the detailed configuration of the wire electrode collection section is shown in FIG. As shown, the wire electrode (
11) may be configured to be fused.

In FIG. 4, (400) is a wire electrode fusing part that fuses the wire electrode (11) that has passed through the processing position. This wire electrode fusing part (400) is similar to the wire electrode fusing part (200) and the third wire electrode fusing part (200) in FIGS.
This corresponds to the wire electrode fusing section (300) in the figure. (401) is a laser oscillator, and (402) is a pipe into which the laser light generated by the laser oscillator (401) enters at one end, and from which the laser light is emitted from a hole (402a) provided at the other end. (11), (15), and (17) are the same as those explained in FIGS. 1 to 3, so their explanations will be omitted. (403) is such that the wire electrode (11) that has passed between the wire electrode feeding roller (15) and the pinch roller (17) enters from one end, exits from the other end, and is collected in the wire electrode collection container (21). It is a cylindrical body arranged in Laser light emitted from the hole (402a) of the pipe (402) enters the hole (403a) provided in a part of the cylindrical surface of this cylindrical body (403) and irradiates the wire electrode (11). (11) is fused.

(404) is a fusing command unit that instructs whether or not to blow the wire electrode (11) via the laser oscillator (401). Note that the wire electrode fusing section (400) includes a laser oscillator (401), a pipe (402), and a cylindrical body (400).
03).

Next, the operation of another embodiment of the invention shown in FIG. 4 will be described. The fusing command unit (404) issues a command to the laser oscillator (401) and intermittently sends the laser beam to the cylinder (9).
Wire electrode (11) through hole (403a) of
The wire electrode (11) is fused. - On the other hand, the wire electrode (11) is being processed and the wire electrode feeding roller (15
) at a predetermined speed, the wire electrode (11)
is fused to a predetermined length and collected in a wire electrode collection container (21).

[Effect] The second invention is configured as described above, and the wire electrode that has passed through the processing position and is fed to the collection position is fused and collected, so that the collection capacity of the wire electrode collection container is significantly increased. This has the effect of providing high reliability and durability as well as high processing accuracy.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing the entire wire electrical discharge machining apparatus according to an embodiment of the present invention, FIG. 2 is a detailed configuration diagram showing an enlarged view of the wire electrode collection section in FIG. 1, and FIG. 3 4 is a detailed configuration diagram showing an enlarged wire electrode recovery section of a wire electric discharge machining apparatus according to another embodiment of the present invention, and FIG. 4 shows a wire electrode of a wire electric discharge machining apparatus according to still another embodiment of the present invention. FIG. 5 is a schematic diagram showing the entire wire electrical discharge machining apparatus of a conventional example, and FIG. 6 is an enlarged view of the wire electrode collecting section in FIG. 5. It is a detailed configuration diagram. In the figure, (15) is a wire electrode feeding roller. (200), (300), (400) are wire electrode fusing parts, (205), (308), (
404) are respective fusing command units. Note that the same group numbers in Figure 1 indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] A wire electrode feeding means for feeding a wire electrode, and a wire fusing means for fusing the wire electrode fed by the wire electrode feeding means, passed through a processing position, and fed to a collection position. A wire electrical discharge machining apparatus comprising: and a fusing command means for instructing the wire fusing means to operate intermittently.