JP3320625B2 - Wire electric discharge machine - Google Patents

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, and more particularly to a wire electric discharge machine provided with a wire collecting device for finely cutting and collecting a wire electrode passing through an electric discharge machining section.

[0002]

2. Description of the Related Art In a wire electric discharge machine, a metal wire having a cross section of approximately a perfect circle and a diameter of 0.3 mm or less is used as a wire electrode. Machining power is supplied to the wire electrode by an electric discharge machining unit, and electric discharge is performed through a minute gap between the wire electrode and the material to be processed, whereby the material to be processed is melted and removed, and machining proceeds. At this time, the wire electrode part also melts and scatters at the same time, and the wire shape accuracy is impaired.However, the deterioration of the wire shape accuracy is compensated by continuously sending a new wire electrode to the machined part during processing. ,
The workpiece can be processed with high processing accuracy.

[0003] The wire electrode that has passed through the electric discharge machining part has been wound up on another reel because of its simple structure, or has been dropped into a large collection container and collected.
In the former, it is difficult to deal with automation such as cutting or re-passing the wire electrode during processing, and in the latter, the installation space of the machine becomes large. 2. Description of the Related Art It has become common practice to continuously and finely cut an electrode and collect it in a small collection container.

[0004]

However, the conventional collecting container is generally made of non-conductive plastic or the like, and particularly when the machine is placed in a low humidity environment, the finely cut wire electrode pieces are cut. By the time it is collected in the collection container, static electricity is generated by rubbing against the wall surface and the entire collection container is charged.When disposing of the collected wire electrode in the collection container, touch the collection container or wire pieces. There was a problem that I sometimes felt uncomfortable.

[0005] The present invention has been made to solve the above-described problems, and has as its object to prevent the collection container from being touched and uncomfortable.

[0006]

According to a first aspect of the present invention, there is provided a wire electric discharge machine provided on a traveling path of a wire electrode extending from an electric discharge machining section to a wire collecting section. In a wire electric discharge machine including a cutting unit for finely cutting and a collection container that is removably installed in the wire collection unit and collects the wire electrode pieces cut by the cutting unit, the collection container is housed inside. By electrically connecting the wire electrode piece to the wire electric discharge machine main body or the ground while the wire electrode piece is housed in the collection container, a charge releasing means for releasing the charge charged on the wire electrode piece is provided. It is characterized by having.

According to the wire electric discharge machine of the first aspect, since the wire collecting container is provided with the charge releasing means, when the wire electrode piece falls into the collecting container, it may collide with the wall of the collecting container. The static electricity generated by this can be constantly grounded. Therefore, when removing the recovery container from which the wire electrode pieces have been recovered, the recoverer does not feel discomfort due to static electricity.

According to a second aspect of the present invention, there is provided a wire electric discharge machine according to the first aspect, wherein the charge releasing means is at least partially exposed to the inner surface of the collection container and to the outer surface of the collection container. And a contact for connecting an exposed portion of the electrode to the wire electric discharge machine or the ground.

According to the wire electric discharge machine of the present invention, when the wire collecting container is set in the wire electric discharge machine, the contact container and the exposed portion of the electrode are brought into contact with each other in a simple manner. It is possible to take Next, a wire electric discharge machine according to a third aspect of the present invention is the wire electric discharge machine according to the second aspect, wherein the electrode is provided at a bottom portion of the collection container, and the collection container is provided with a bottom hole exposing the electrode. The contact is in contact with the electrode through the bottom hole.

[0010] In the wire electric discharge machine according to the third aspect,
Since the electrodes are provided on the bottom surface of the collecting container, the wire electrode pieces entering the wire collecting container are always electrically connected to the electrodes on the bottom surface. Also, since the electrodes are provided only on the bottom,
A portion other than the bottom surface is made of resin or the like, so that the entire collection container can be lightened. Furthermore, the collection container need only place the electrode on the bottom surface, and is easy to manufacture.

Next, a wire electric discharge machine according to claim 4 is the wire electric discharge machine according to claim 2 or 3,
The contact is provided with an urging means for urging the tip in a direction to contact the exposed portion of the electrode. In the wire electric discharge machine according to the fourth aspect of the present invention, since the contact is urged to contact the electrode on the bottom surface of the collection container, the electrode and the contact can be reliably contacted.

Next, in a wire electric discharge machine according to a fifth aspect of the present invention, in the wire electric discharge machine according to the fourth aspect, the contact is provided at a tip end of the coil spring formed of a conductive material. And a contact piece. According to the wire electric discharge machine according to the fifth aspect, the urging means is formed of a conductive material, so that the collection container can be grounded with a simple structure without separately providing the urging means and the discharge path. it can.

Next, a wire electric discharge machine according to a sixth aspect of the present invention is the wire electric discharge machine according to the first aspect, wherein the collection container itself is formed of a conductive material as the charge releasing means. . According to the wire electric discharge machine according to the sixth aspect, since the collection container itself is formed of a metallic material, the wire electric discharge machine itself is grounded. The static electricity generated in the collection container can be grounded simply by setting the collection container in the collection container.

By the way, in the wire electric discharge machine according to the first to sixth aspects, it is possible to release the static electricity charged in the recovery container by providing the recovery container with the charge releasing means. There is a case where it is guided to the collection container without being cut and contacts the collection container. In this case, the wire electrode that has not been cut from the collection container is electrically similar to the relationship between the wire electrode and the object to be cut in the processing section, and a trouble such as spark or red heat occurs in the collection container.

Therefore, as means for preventing such troubles, the wire electric discharge machine according to claim 7 is based on claim 1.
7. In the wire electric discharge machine according to any one of items 6 to 6, when the recovery container accidentally approaches a wire electrode that has not been cut by the cutting means, the recovery container or a wire housed in the recovery container. A spark preventing means is provided for preventing a spark from being generated between the electrode piece and the approaching wire electrode.

In the wire electric discharge machine according to the present invention, since the collecting container is provided with the spark preventing means, it is possible to prevent sparks and red heat generated when the uncut wire electrode touches the collecting container. Here, as a specific means of the spark preventing means, the wire electric discharge machine according to claim 8 is the wire electric discharge machine according to claim 7, wherein, as the spark preventing means, the electric charge is released by the electric charge releasing means in a path for releasing electric charges. It is characterized by having a high electrical resistor.

According to the wire electric discharge machine of the present invention, the high electric resistance element in the path of the charge releasing means functions as an insulator even if the current is large as long as the voltage is sufficient for electric discharge machining. I do. Therefore, the collection container functions as an insulator for the uncut wire electrode, and it is possible to prevent sparks and red heat in the collection container. On the other hand, if the high electrical resistor has a voltage enough to generate static electricity, the electric charge can be gradually released to the ground, so that the static electricity charged in the collection container can be grounded.

The collection of the wire electrode pieces by the collection container of the present embodiment is not performed immediately after the collection, but is performed after the wire electrode pieces have accumulated in the collection container to some extent. Therefore,
When static electricity discharges a person to a medium, the voltage at which a person senses the static electricity is 1000 V or more. Therefore, a high electric resistor that charges the collection container to 1000 V or less when the collection container is carried out may be used.

The wire electric discharge machine according to a ninth aspect of the present invention is the wire electric discharge machine according to the eighth aspect, wherein the high electric resistor has a resistor of several tens of kiloohms to several hundreds of kiloohms. It is characterized by. If the high electric resistance is set to several tens of kilo-ohms to several hundreds of kilo-ohms in this way, the high electric resistance functions as an insulator for the wire electrode, and for the static electricity, the charging voltage of the collection container is set to 1000 V during collection. It functions as spark prevention means described below.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A schematic configuration of an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of the entire wire electric discharge machine 10 to which the present invention is applied. In FIG. 1, the wire electric discharge machine 10 includes a column 12, a base 14, and a control device 16, and a Z-axis support base 18 in the vertical axis (hereinafter, referred to as "Z-axis") direction is provided at the tip of the column 12. An upper wire guide portion 20 is attached to the lower end of the Z-axis support base 18 so as to be movable in the Z-axis direction, and an upper nozzle 22 is provided at the lower end of the upper wire guide portion 20.

On the other hand, a work table 24 movable on two axes (X-axis, Y-axis) orthogonal to a horizontal plane perpendicular to the Z-axis is provided on the base 14. The workpiece W is fixed. The tip of a lower arm 26 extending from the column 12 faces the inside of the work table 24, and a lower wire guide portion 29 is provided at the tip, and a lower nozzle 28 is mounted on the upper end of the lower wire guide portion 29. ing.

When the wire electrode 30 is pulled by the driving roller 48 provided in the cutting machine 38, the wire electrode 30 emits from the supply reel 32 and is applied with a tension of about 3 kgw by the brake 35 provided on the column 12. The tensioned wire electrode 30 is connected to the guide roller 34 a of the Z-axis support base 18 and the guide roller 34 of the lower wire guide portion 29.
It passes through the electric discharge machining part 36 under the guidance of b. Then, the guide is fed to the cutting machine 38 via the wire electrode traveling path of the lower arm 26 by the guide of the guide roller 34 c in the column 12.

Next, as shown in FIG. 2 and FIG.
Is a drive roller 48 for drawing in the wire electrode 30, a rotary blade 50 for rotating and cutting the wire electrode sent out by the drive roller 48, and a wire electrode piece 40 cut by the rotary blade 50. Since the wire electrode 30 is configured so as to be able to be taken out inside the wire 38, all the wire electrodes 30 sent to the cutting machine 38 are cut here and collected by the wire recovery container 42.

First, a first embodiment of the wire collecting container 42 to which the present invention is applied will be described with reference to FIG. The wire collecting container 42 of the first embodiment is formed of a non-conductive material, for example, a plastic material, and has a hole 43 in the bottom surface. This hole 43 is closed by an electrode 44 provided on the bottom surface. The electrode 44 is made of a conductive material such as iron or steel, and a conductive contact 46 a is in contact with a portion of the wire collection container 42 that is viewed through the hole 43 on the bottom surface. The contact 46a is in contact with the electrode 44 by being urged upward by a conductive coil spring 46 installed on the base 14. The base 14 is always used in a state of being grounded.

The wire collection container 42 constructed as described above
Inside, when the cut wire electrode piece 40 falls into the collection container, it collides with the wall surface of the wire collection container 42,
It generates static electricity due to rubbing. However, the charged wire electrode piece 40 is electrically connected to the electrode 44 directly or via the already collected and deposited wire electrode piece 40, and is grounded through the contact 46a, the coil spring 46, and the base 14. Therefore, charges can be released, and no charges are stored in the wire collection container 42.

Therefore, even if the collecting person touches the wire collecting container 42 when collecting the wire electrode pieces 40, there is no discomfort due to static electricity. Next, a second embodiment of the wire collecting container 42 to which the present invention is applied will be described with reference to FIG.

In the wire collecting container 42 of the second embodiment, a high electric resistor 52 having an electric resistance of several tens to several hundreds of kiloohms is provided at a portion of the electrode 44 provided in the wire collecting container 42 in contact with the contact 46a. It is different from the first embodiment in that it is provided. When the wire electrode 30 cannot be cut due to a defect such as a poor cutting of the rotary blade 50, the wire electrode 30 directly contacts the electrode 44 or the wire electrode piece 40 that has already been collected and deposited is cut. Contact is possible. In such a case, the uncut wire electrode 30 and the electrode 44 directly grounded or the deposited wire electrode piece 40 cause the high current applied to the wire electrode to propagate through the electrode 44 as it is due to the potential difference. Therefore, spark or red heat is generated in the wire collection container 42.

Therefore, if the high electrical resistor 52 is provided on the bottom surface of the electrode 44, the high electrical resistor 52 acts as an insulator with respect to the voltage of 100 V to 200 V applied to the wire electrode 30. Do not shed. Therefore,
The generation of spark or red heat in the wire collection container 42 can be prevented.

On the other hand, the high electric resistance 52 has a voltage of 4000 when static electricity is discharged using a human as a medium.
With a voltage of about V, the charge can be released, and does not completely function as an insulator against static electricity.
Therefore, there is no discomfort due to static electricity when the collecting person takes out the wire collecting container 42.

The wire collecting container 42 may be configured such that a bag or container made of a conductive substance is lined with a resin collecting container having a hole in the bottom surface. Further, the entire wire collection container 42 may be made of a conductive material.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating a configuration of an entire wire electric discharge machine to which the present invention is applied.

FIG. 2 is a schematic configuration diagram of a first embodiment of a wire collection container to which the present invention is applied.

FIG. 3 is a schematic configuration diagram of a second embodiment of the wire collection container to which the present invention is applied.

[Explanation of symbols]

10: wire electric discharge machine 12: column 14: base
DESCRIPTION OF SYMBOLS 16 ... Control device 18 ... Z-axis support stand 20 ... Upper wire guide part 22 ... Upper nozzle 24 ... Work table 26 ... Lower arm 28 ... Lower nozzle 29 ... Lower wire guide part 30 ... Wire electrode 32 ... Supply reel 34a, 34b 34c ... guide roller 35 ... brake 36 ... electric discharge machining part 38 ... cutting device 40 ... wire cutting piece 42 ... wire collection container 43 ... hole 44 ... electrode 46 ... coil spring 46a ... contact 48 ... driving roller 50 ... rotary blade

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B23H 7/10

Claims (9)

(57) [Claims] 1. A cutting means provided on a traveling path of a wire electrode extending from an electric discharge machining section to a wire collecting section, and a cutting means for finely cutting the wire electrode; A collecting container for collecting the cut wire electrode pieces, wherein the collecting container holds the wire electrode pieces contained therein in the collecting container. A wire electric discharge machine comprising a charge releasing means for releasing electric charges charged to the wire electrode piece by being electrically connected to a main body or a ground. 2. The wire electric discharge machine according to claim 1, wherein an electrode that is at least partially exposed to an outer surface of the collection container is disposed on the inner surface of the collection container as the charge releasing means, and an exposed portion of the electrode is provided. A wire electric discharge machine, comprising: a contact for connecting the electric discharge machine to the wire electric discharge machine or the ground. 3. The wire electric discharge machine according to claim 2, wherein the electrode is provided at a bottom of the collection container, the collection container is provided with a bottom hole exposing the electrode, and the contact is provided with the bottom hole. A wire electric discharge machine characterized by being in contact with the electrode through a wire. 4. The wire electric discharge machine according to claim 2, wherein the contact has an urging means for urging the tip in a direction in which the tip contacts the exposed portion of the electrode. Wire electric discharge machine. 5. The wire electric discharge machine according to claim 4, wherein the contact comprises a coil spring formed of a conductive material and a contact piece provided at a tip of the coil spring. Wire electric discharge machine. 6. The wire electric discharge machine according to claim 1, wherein said collection container itself is made of a conductive material as said charge releasing means. 7. The wire electric discharge machine according to claim 1, wherein the collecting container or the collecting device is connected to the collecting container when a wire electrode that has not been cut by the cutting means accidentally approaches the collecting container. A wire electric discharge machine further comprising a spark preventing means for preventing a spark from being generated between the wire electrode piece housed in the container and the close wire electrode. 8. The wire electric discharge machine according to claim 7, wherein a high electric resistor is provided in a path for discharging the electric charge by the electric charge releasing means as the spark preventing means. . 9. The wire electric discharge machine according to claim 8, wherein the high electric resistance body is several tens of kiloohms to several hundreds of ohms.
A wire electric discharge machine comprising a kilohm resistor.