JPH0232347Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire-cut electric discharge machine, and more particularly to a wire-cut electric discharge machine in which a current-carrying body for supplying current to a wire in the wire-cut electric discharge machine is detachably provided.

A wire cut electric discharge machine guides a wire in the vertical direction using upper and lower wire guide devices placed above and below a workpiece, and generates an electric discharge between the wire and the workpiece. The workpiece is processed by this method. As mentioned above, the wire is prone to minute vibrations due to electric discharge occurring between the wire and the workpiece, and since the wire is always running in the vertical direction, the wire guide device The parts that come into contact are subject to severe wear.

Therefore, in the past, for example,
As shown in Japanese Patent No. 150934, there is also a structure in which a diamond (dice guide) with a small hole is used in the guide portion of the wire guide device. However, the current-carrying body that energizes the wire is simply replaced or re-polished when it wears out, which poses problems when using the current-carrying body. There were problems such as being easily influenced.

The present invention has been devised in view of the above-mentioned conventional problems, and embodiments thereof will be described in detail below with reference to the drawings.

In the embodiment of FIG. 1, the wire 1 passes through the upper wire guide device (not shown) and the workpiece 3, moves downward, passes through the center of the nozzle 5 in the lower wire guide device, and passes through the lower wire guide device (not shown) and the workpiece 3. After passing through the die guide 7 and coming into contact with the surface of the lower current-carrying body 9, it is guided to a pulley or the like (not shown) and wound up at a lower position.

As is clear from the figure, the nozzle 5 has a hollow conical shape with a flange 15 fitted into an annular groove 13 provided in a support block 11 attached to the machine frame of the electrical discharge machine, and is movable in the vertical direction. It is free.

Further, a through hole having a tapered surface and a small diameter is provided in the center of the support block 11, and a wire guide 17 having the die guide 7 at its tip is fitted into this through hole. There is. In order to fix the wire guide 17, a guide presser 19 is screwed into the female thread of the support block 11 to press and fix the wire guide 17 to the tapered surface.
The portion protrudes largely from the through hole toward the workpiece 3 and is located close to the opening of the nozzle 5 so as to be surrounded by the nozzle 5.

The wire guide 17 has a pin 21 implanted on the side surface near the lower end in FIG. The directional position of a current-carrying body 9 detachably mounted close to the die guide 7 is determined on one side of the central through-hole.

Furthermore, in the embodiment shown in FIG. 1, the tubular screw 25 is screwed into the guide holder 19, and a lock nut 31 that connects the lead wire 29 from the terminal 27 that transmits the electric potential to the current-carrying body 9 to the guide holder 19 is screwed. ing.

Further, a machining fluid supply port 33 is provided on the lower outer periphery of the support block 11, and the machining fluid under pressure enters the inside of the nozzle 5 through a plurality of vertical grooves 35 provided on the outer periphery of the wire guide 17. reached, nozzle 5
is pushed upward until the upper end contacts the lower surface of the workpiece 3 or until the flange portion 15 contacts the stop ring 36. Processing fluid 1
The part is the die guide 7 on the upper part of the wire guide 17.
Between the current-carrying body 9 and the inside of the nozzle 5 and the wire guide 17, it flows downward along the surface of the current-carrying body 9 through a plurality of radial channels 37 that communicate with the inside of the nozzle 5 and the inside of the wire guide 17, thereby performing a cooling effect. It is discharged through the tubular screw 25.

As shown in the figure, the current-carrying body 9 is provided in the wire guide 17 in close proximity to the die guide 7, and its shape is symmetrical on the front and back so that it contacts the wire 1 over a relatively long range. It has an oblate shape,
It is attached to the wire guide 17 in a detachable and replaceable manner. A plurality of triangular grooves 39 are provided on both the front and back surfaces of the current-carrying body 9, and the triangular grooves 39 cross the direction of movement of the wire 1.
We have secured contact with them at multiple locations.

With the configuration described in detail above, the nozzle 5 rises due to the pressure of the machining fluid, contacts the lower surface of the workpiece 3, and supplies the machining fluid to the electrical discharge machining part without wasting it. Controlled movement on a horizontal plane can be suppressed to a small resistance using the machining fluid as an intermediary.

In addition, since the die guide 7 protrudes toward the workpiece 3 side, the wire 1 is guided in close proximity to the workpiece 3, thereby making it possible to further suppress minute vibrations of the wire 1. Further, since the current-carrying body 9 is close to the die guide 7, it is possible to effectively suppress minute vibrations of the wire 1, for example, when the vibrations have a node at the die guide 7.

Furthermore, the wire guide 17 is cooled by the machining fluid flowing through the groove 35, and the current-carrying body 9 is directly cooled by the machining fluid flowing into the wire guide 17 from the flow path 37, so that the current-carrying body 9 is Thermal effects due to heat generation can be effectively suppressed, fine wires 1 can be prevented from being cut, and precision can be further improved.

In the embodiment shown in FIG. 2, the shape of the current-carrying body 9 is an abacus-shaped disk, and is flat and symmetrical. 19 is removed, the wire guide 17 is removed below the support block 11, a tool is inserted through the tool insertion hole 41, and the set screw 43 is loosened, then the abacus bead-shaped current-carrying body 9 can be rotated in any direction. It is possible to move.

Conventionally, when wires are used as electrodes in electrical discharge machining, the wires are often disposable, but the wear of the current carrying body is significant, and the wires must be replaced or re-polished each time. According to
If the angle is changed within a range of 180 degrees, for example, by 20 degrees, the contact position between the wire 1 and the disc-shaped current carrying body 9 will be changed, so it can be used by rotating only 8 times before repolishing. .

Moreover, since the front and back sides are symmetrical, the lifespan is twice as long as that of conventional models when the front and back sides are symmetrical, and for example, 16 times longer when using a rotary type with point symmetry. Since the body has a screw hole in the center, there is no need to provide a plurality of triangular grooves 39 as shown in FIG. 1, but circumferential grooves may be formed on both the front and back surfaces.

As can be understood from the above description of the embodiments, the gist of the present invention is essentially as stated in the claims of the utility model registration. As is clear from the description, in the present invention, firstly, the tip of the wire guide, which is equipped with a die guide for guiding the wire, approaches the tip of the nozzle provided on the support block. It is provided. Therefore, the wire is guided by the die guide at a position close to the workpiece, and the minute vibrations of the wire are further suppressed.

Second, in the present invention, the current-carrying body for energizing the wire is detachably installed in the wire guide in the vicinity of the die guide, and the current-carrying body is attached to the front and back surfaces where the current-carrying body contacts the wire. The sides are formed in a symmetrical shape. Therefore, the vibration of the wire is suppressed due to the contact between the current carrying body and the wire over a relatively long range, and when the front side of the current carrying body is worn out, by reversing the front and back of the current carrying body, The back side can be used as the new front side.

Thirdly, the wire guide is cooled by the machining fluid flowing into the nozzle through the grooves of the wire guide, and the current-carrying body is directly cooled by the machining fluid flowing into the wire guide from the flow path provided in the wire guide. Therefore, it is possible to effectively suppress the thermal influence due to heat generation in the current-carrying body portion. Therefore,
This can prevent fine wire breakage due to thermal effects and can further improve accuracy.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional front view of one embodiment of the device of the present invention;
FIG. 2 is a sectional front view of another embodiment of the device of the present invention. Explanation of symbols representing main parts in the drawings, 3...
Workpiece material, 5... Nozzle, 9... Current carrying body, 11...
...Support block, 17...Wire guide.

Claims (1)

[Claims for Utility Model Registration] (1) A nozzle 5 whose tip is oriented in 3 directions of the workpiece is provided on the base block 11 supported by the machine frame of the electric discharge machine, and the base block 11 is provided within this nozzle 5. The tip of the wire guide 17 provided on the block 11 is provided close to the tip of the nozzle 5, and the die guide 7 for guiding the wire 1 is provided at the tip of the wire guide 17 to energize the wire 1. A current-carrying body 9 is attached detachably and replaceably in the wire guide 17 in the vicinity of the die guide 7, and the front and back sides that contact the wire 1 are formed in a symmetrical shape, and the front and back sides are separated. The wire guide 17 is provided with a groove 35 which is replaceable and usable, and which guides the machining liquid into the nozzle 5, and a flow path 37 which communicates the inside of the nozzle 5 with the inside of the wire guide 17. , a wire cut electric discharge machine characterized in that a wire guide 17 is provided between a die guide 7 and a current carrying body 9. (2) The current-carrying body 9 is formed into a disk shape, and the disk-shaped current-carrying body 9 is rotatable around an axis in a direction perpendicular to the wire 1 in order to change the contact portion with the wire 1. A wire-cut electric discharge machine according to claim 1 of the utility model registration claim.