JPS644768Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] The invention provides a method for wire-cut electric discharge machining.
The present invention relates to a wire ejecting device that ejects wire electrodes.

[Background Art] An example of a wire discharge device in a conventional wire-cut electric discharge machine is shown in FIG. In the figure, the wire electrode 20 that has finished discharging passes through the lower wire guide 10 and passes through several rollers or pulleys and a wire feed roller 30.
It is sent to the discharge box 40. A discharge connector 50 is provided after the wire feed roller 30, and this discharge connector 50 guides the wire electrode 20 discharged from the wire feed roller 30 to the discharge box 40.

FIG. 2 is an enlarged sectional view of the wire roller 30 and discharge connector 50 of FIG. 1. This discharge connector 50 has a vertically elongated substantially rectangular parallelepiped shape, and has a through hole 51 in its upper part through which a wire electrode passes, and its bottom part 52 is open. Also,
The left side wall 53 and the right side wall 54 are parallel, so that the discharge connector 50 has a symmetrical shape with respect to a plane that includes a vertical line and is parallel to the axis of the wire feed roller 30.

FIG. 3 is an enlarged sectional view of another conventional discharge connector 60. Although the left side wall 63 and the right side wall 64 are not parallel, this discharge connector 60 has a through hole 61 and a bottom portion 62 is open.
They are the same in that they are bilaterally symmetrical.

In addition, numeral 21 is a curled wire electrode, numeral 41 is a bottom center part of the discharge box 40, and numeral 4 is a curled wire electrode.
Reference numeral 2 denotes a portion of the bottom surface of the discharge box 40 other than the center portion 41 of the bottom surface.

[Problems to be Solved by the Invention] In the above conventional example, the wire electrode 20 that has finished discharging curls after passing through the discharge connector 30, and remains curled until it passes through the discharge connector 5.
0 and is stored in the discharge box 40.

The discharge box 40 is large enough to accommodate a large amount of wire electrodes 20.
This essentially makes it possible to automatically operate electrical discharge machining over a long period of time.

However, in the conventional device, the curled wire electrode 21 falls directly below it, is stacked on top of it, and the next curled wire electrode 21 is stacked on top of it, and this process is repeated continuously. It will be done. Therefore, the curled wire electrode 21 is formed only in the center portion 41 of the bottom surface of the discharge box 40.
is deposited, and is no longer deposited on the portion 42 of the discharge box 40 other than the bottom central portion 41.

For this reason, the curled wire electrode 21 accumulates in the central part 41, gradually increases its height, hits the upper part of the discharge connector 50, and then gets entangled with the wire feed roller 30, so that normal wire cutting cannot be performed. become unable to do so.

In the above case, since the accumulated area of the curled wire electrode 21 is smaller than the area of the bottom surface of the discharge box 40, the wire electrode 21 is deposited on the roller 30 after starting automatic discharge machining operation.
The time it takes for No. 1 entanglement to occur is relatively short.
Therefore, there is a problem that automatic operation of electric discharge machining is difficult.

In the present invention, when guiding a wire electrode from a discharge roller to a discharge box, the wire electrode can be spread and deposited without moving the discharge box, and the wire electrode is not entangled with the wire feed roller. It is an object of the present invention to provide a wire ejecting device for a wire cut electric discharge machine that can prolong the time required for the wire to stick.

[Means for Solving the Problems] In the present invention, the discharge connector has a shape that opens downward and is asymmetrical with respect to a plane that includes a vertical line and is parallel to the axis of the wire feed roller.

[Function] In the present invention, the discharge connector is shaped to open downward and is asymmetrical to the plane that includes the vertical line and is parallel to the axis of the wire feed roller. When guiding the wire electrode, the wire electrode can be spread and deposited without moving the discharge box, and the time required for the wire electrode to become entangled with the wire feed roller can be lengthened.

[Embodiment of the invention] FIG. 4 is a sectional view showing an embodiment of the invention. Components similar to those of the conventional example shown in FIGS. 1 to 3 are designated by the same reference numerals. In FIG. 4, a discharge connector 70 has a through hole 71 in its upper part through which the wire electrode 20 is passed, and its bottom surface portion 72 is open, similar to the conventional example shown in FIGS. 1 to 3. However, the left side wall 73 and the right side wall 74 are neither parallel nor symmetrical, and have an asymmetrical shape in FIG. 4 and a shape that opens downward. That is, the discharge connector 7
0 includes a vertical line and has an asymmetrical shape with respect to a plane parallel to the axis of the wire feed roller 30.
Note that reference numeral 75 indicates a portion of the discharge connector with a large width, and reference numeral 76 indicates a portion of the discharge connector 70 with a small width.

Next, the operation of the above embodiment will be explained.

When the discharge connector 70 is used, the curled wire electrode 21 fed from the wire feed roller 30
does not fall just directly below it, but falls unevenly. In other words, the curled wire electrode 21
is the part 7 of the discharge connector 70 where the hem is widened.
It tends to fall slightly closer to 5.

That is, first, the curled wire electrode 21 is deposited in the deep part 75 of the discharge connector 70,
The next wire electrode 21 is discharged on top of it in an oblique direction (in the direction shown by the arrow in FIGS. 4 and 5), so that the wire electrode 21 deposited in the deep part 75 is removed as shown in FIG. Pushed slightly to the right, the peak of the wire electrode 21 gradually moves from the center of the bottom surface 72 to the right in FIG. Therefore, in the end, the entire bottom surface of the discharge box 40 is covered with the curled wire electrode 2.
1 will be diffused and deposited.

That is, the curled wire electrode hits both side surfaces 73 and 74 of the discharge connector 70, and when the wire electrode falls, it moves (while being biased) along the wide skirt portion 75. Then, diagonally (Fig. 4,
After falling (diagonally to the left in FIG. 5), the fallen and deposited wire electrodes press against one side wall (left side wall in FIG. 5) of the discharge box 40, and due to the reaction, the wire electrodes fall and accumulate on the opposite side wall (left side wall in FIG. 5). Go to the middle, right wall). Therefore, the wire electrode is deposited on the left side of the discharge box 40, and gradually the deposit moves to the right side. This allows the wire electrode to be diffused and deposited without moving the ejection box.

For this reason, it takes a longer time than before for the curled wire electrode 21 to reach a predetermined height in the discharge box 40, and therefore,
The curled wire electrode 21 is connected to the wire feed roller 3
There is no longer a need for humans to monitor every short period of time to see if there is a problem with 0. Therefore, there is an advantage that automatic operation of electrical discharge machining can be executed reliably.

In the above embodiment, the side walls 73 and 74 of the discharge connector 70 have a straight cross section, that is, a flat surface.
This may be constructed with a curved surface, and the inclination angle of each side wall may be determined as necessary. One of the two side walls may be a vertical surface. Furthermore, the material and size of the discharge connector 70 can be freely set.

According to the present invention, when guiding a wire electrode from the discharge roller to the discharge box, the wire electrode can be spread and deposited without moving the discharge box, and the wire electrode can be guided to the wire feed roller. This has the effect of increasing the time it takes for the vehicle to become entangled with the vehicle, thereby facilitating automatic driving.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a wire ejection device in a conventional wire-cut electric discharge machine, Fig. 2 is an enlarged sectional view showing the ejection connector shown in Fig. 1, and Fig. 3 is a sectional view showing another conventional example. FIG. 4 is a sectional view of a discharge connector showing one embodiment of the present invention, and FIG. 5 is a diagram showing the above embodiment and a discharge box. 20...Wire electrode, 21...Curled wire electrode, 30...Wire feed roller, 40...Ejection box, 70...Ejection connector, 71...Through hole, 72...Bottom part, 73...Left side wall , 74...
...Right side wall, 75...Large part with wide hem, 76
...A small part of the hem that widens.

Claims (1)

[Claims for Utility Model Registration] A wire feeding roller for feeding the wire electrode after discharge, a discharge box for storing the wire electrode discharged from the wire feeding roller, and a discharge box for storing the wire electrode discharged from the wire feeding roller. In the wire discharge device having a discharge connector that guides the wire to the discharge box, the discharge connector has a shape that opens downward and is asymmetrical with respect to a plane that includes a vertical line and is parallel to the axis of the wire feed roller. A wire ejecting device for a wire cut electrical discharge machine, characterized by: