JPH07266136A - Wire electric discharge machine - Google Patents

Abstract

(57) [Abstract] [Purpose] In a wire electric discharge machine, the work on the table can be easily approached at the time of exchanging the work, even if the work tank does not have an opening / closing door. When opening and closing, the working fluid that has adhered to the back of the door will not drop onto the floor and stain the surrounding area, and the required floor area will be prevented from increasing by opening the door. [Structure] Attach the table 2 to the bed 4 that is the base,
A pair of upper and lower heads 9 and 11 that are movable in the X and Y axis directions with respect to the work fixed on the table 2 are provided.
The arm 10 holding the lower head 11 penetrates one wall surface 1a fixed to the table 2 of the processing tank 1, and
A wire electric discharge machine in which the processing tank 1 is formed by surrounding the table 2 with the wall surface 1a and other three wall surfaces having a U-shape corresponding to the wall surface 1a, and the three wall surfaces of the processing tank 1 can be moved up and down.

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 having a machining tank.

[0002]

2. Description of the Related Art Electric discharge machining is carried out in a machining tank filled with a machining liquid, but in wire electric discharge machining, a wire electrode is passed through a work by sandwiching the work with upper and lower heads, and machining is performed in that state. When exchanging a workpiece, the machining tank must be moved from the machining position, which makes it difficult to exchange the workpiece.

That is, in the electric discharge machining apparatus as disclosed in Japanese Patent Application Laid-Open No. 3-277422, unlike wire electric discharge machining, since it is die-sinking electric discharge machining, machining can be performed only by moving the upper head, and the lower head can be moved. Since it is not necessary, the entire work tank surrounded by the four surfaces can be lowered to easily replace the work attached to the table.

Further, as disclosed in Japanese Patent Laid-Open No. 6-55349, the other three wall surfaces except one wall through which the arm of the processing tank penetrates have a U-shaped integral structure and can be moved up and down. An electric discharge machine and a wire-cut electric discharge machine as disclosed in JP-A-2-298435, in which three wall surfaces of a machining tank have a bellows structure, and the bellows structure expands and contracts to raise and lower the three wall surfaces are known. ing.

However, both of them adopt the cross table system in which the table moves in the X and Y axis directions and are not fixed tables, so that when the work is changed by the automatic work changing device, the wire electric discharge machine side is used. It cannot be done in the same position. Further, the structure of the working cleaning body becomes complicated to seal the working liquid filled in the working tank.

Generally, in a wire electric discharge machine, as shown in FIG.
As shown in (side view), FIG. 5 (front view), and FIG. 6 (top view), the processing tank 1 is fixed to the table 2, and the saddle 3 and the table 2 thereunder are fixed with respect to the bed 4. like,
A V-axis slider 6, a U-axis slider 7, and a quill 8 which are provided in the upper part of a column 5 which is moved up and down in the X and Y axes and is erected on the bed 4.
Upper head 9 provided through the column, processing tank 1 from the middle of the column
The lower head 11 is provided at the tip end position of the arm 10 penetrating the column side wall surface 1a of the upper head 9 and the lower head 11 with respect to the work placed on the work mount 12 on the table 2. It is configured to perform electric discharge machining by means of a wire electrode 13 stretched between and.

The arm 10 is provided so as to penetrate the column side wall surface 1a of the processing tank 1, and the processing tank 1 is mounted on the table 2
It is attached to and moves with the table, so arm 10
Has a seal configuration that can be displaced left and right, and front and back with respect to the side wall surface 1a. Here, an elongated hole 1e in the X-axis direction is formed in the side wall surface 1a, and the arm 10 is penetrated through the elongated hole 1e. On the other hand, the arm 10 penetrates to form a seal plate 1d which is slidable while sealing in the Y-axis direction. Provided and its seal plate 1d
Is attached to the side wall surface 1a so as to close the elongated hole 1e and slidable in the X-axis direction.

By the way, in the wire electric discharge machine shown in FIGS. 4 to 6, when the work is to be replaced, the lower head is used.
Since the arm 10 supporting 11 penetrates the column side wall surface 1a and the processing tank 1 is fixed to the table 2,
Since it is not possible to lower the entire processing tank 1 to remove or set the work on the work mounting table 12, as shown in FIG. 6, the front wall of the processing tank 1 should be used as the opening / closing door 1b to move the work. ing.

However, when the machining tank front opening / closing door 1b is opened in order to move the work on the work mount 12 after removing the machining liquid in the machining tank, the machining liquid is inevitably formed on the inner surface of the opening / closing door 1b. Is inevitably adhered to the floor, and when the opening / closing door 1b is opened, it is inevitable that the floor will be dropped and soil the floor. Also, there is an opening / closing door 1b about 1m
Not only does it require a floor space for opening and closing, but it also makes it difficult to approach when exchanging workpieces.

Further, Japanese Patent Laid-Open No. 6-63824 discloses that
A wire electric discharge machine in which the work side is fixed and the wire electrode side moves in the X and Y axis directions is disclosed. However, the processing tank does not move up and down, and has the same problem as described above.

[0011]

Since the wire electric discharge machine as described above is not of the machining tank vertical type, it is not possible to easily approach the work on the work mount during work replacement. Also, as the processing tank door opens and closes,
It is necessary to take a large floor space, and further, when the processing tank door is opened and closed, the working fluid adhering to the back surface of the door drops onto the floor and the surroundings of the machine are unavoidably soiled. The present invention is intended to solve the problems inherent in the above-mentioned conventional techniques.

[0012]

In order to achieve the above-mentioned object, the present invention serves as a base of a wire electric discharge machine for performing electric discharge machining by moving a wire electrode and a workpiece relatively while traveling the wire electrode. A bed, a table provided on the bed, a head that guides a pair of upper and lower wire electrodes movable relative to a workpiece fixed on the table in two directions orthogonal to the X and Y axes, and the lower Wire electric discharge machining comprising: a machining tank formed by surrounding the table composed of one wall surface through which an arm holding a head penetrates and another three wall surfaces; and an elevating mechanism for elevating the three wall surfaces of the machining tank. Machine.

[0013]

In the present invention, the work is fixed to the work mount on the table, the work electrode is penetrated by the wire electrode between the upper head and the lower head of the arm tip, and then the working tank is raised to move the lower head. A processing tank is configured by one wall surface through which the provided arm penetrates and the other three wall surfaces, and the processing liquid is stored in this processing tank before processing by the wire electrode. The wire electrode 13 that has passed through the lower head 11 is collected in the used wire collecting portion provided in the column 5 through the arm 10.

After the machining is completed, the machining liquid is discharged and the three wall surfaces of the machining tank are lowered while leaving the one wall surface on the column side that penetrates the arm, so that the work can be approached from three directions and the work can be exchanged. You will be able to do it easily.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. The specific construction of each member for assembling the device of the present invention is appropriately within the technical level in the field at the time of the application of the present invention. Considering that it is possible to change the design of the above, the gist of the present invention should not be limitedly interpreted based on only the structure and shape of the present embodiment without showing any special reason.

FIG. 1 is an overall side view of an embodiment of the wire electric discharge machine of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a plan view thereof (with a pallet magazine device), which are the same parts as the conventional device described above. Will be described using the same reference numerals. A table 2 is fixed to the bed 4, and a pallet mount 14 having a built-in chuck for detachably holding the pallet 22 is provided on the table 2.

As shown in FIG. 1, the table 2 of the bed 4 is
The saddle 3 is provided on the bed 4 on the side (back side of the wire electric discharge machine) so as to be movable at right angles to the paper surface (X-axis direction), and the upper surface of the saddle 3 is defined by the moving direction X of the saddle 3. A column 5 is provided so as to be movable in the Y axis direction at a right angle.

The table 2 on the front surface of the column 5 in the Y-axis direction
A processing tank 1 is provided so as to surround the table 2. On the column 5 side of the table 2, an arm 10 protruding from the column 5 in the Y-axis direction is provided.
One wall surface 1a of the processing tank 1 fixed to the penetrating table 2 is provided so as to be slidable and movable to the left and right, and when facing the wall surface 1a, the U-shape is seen from above. The wall surface 1c is integrally formed so as to be vertically movable via a seal (see FIGS. 2 and 3). (In this example,
A laterally long groove is provided on the wall surface 1a so that the arm 10 can move horizontally in the X direction, and the arm 10 is formed so as to be slidable in the Y-axis direction along the back surface of the wall surface 1a in an airtight state. )

As shown in FIG. 2, the U-shaped wall surface 1c is constructed so that it can be moved up and down by a rack 15 attached to a part of the U-shaped wall surface 1c and a pinion 16 fixed appropriately. Appropriate seals 17 are interposed between a portion of the U-shaped wall surface 1c facing the wall surface 1a and a portion for the peripheral edge of the table 2. Further, a processing liquid tank 18 for discharging and containing the processing liquid stored in the processing tank 1 is provided at the lower peripheral edge of the table 2. The dirty working liquid in the working tank can be collected by opening and closing the seal 17, and the supply of the working liquid to the working tank 1 can be eliminated by the working liquid supply device 19 as shown in FIG. Be seen.

A V-axis slider 6 (Y
The quill 8 is provided via a U-axis slider 7 (moves in parallel to the X-axis) and a Z-axis of the quill 8.
An upper head 9 for guiding the wire electrode 13 attached to the tip of the upper head 9 can be adjusted up and down according to the thickness of the workpiece by axial (vertical) movement. V-axis slider 6, U
The shaft slider 7 is not necessarily provided, but if it is used, it is possible to process the conical surface of the work with the wire electrode. Upper head 9 and lower head 11 for guiding the wire electrode 13
Is normally processed at the vertical and vertical corresponding positions. In FIG. 1, reference numeral 20 is an NC / power supply device for performing various controls of the wire electric discharge machine.

FIG. 3 is a top view showing a state in which the pallet magazine device 21 is connected to the wire electric discharge machine according to the present invention, and 16 pallets 22 on which a work is placed are shown. Is moved to the work exchange corresponding position.

When attaching or replacing a work in the wire electric discharge machine, a U-shaped wall 1c constituting the machining tank 1 is formed.
Is lowered and the three surfaces of the work are exposed to the outside, so that the container 24 of the pallet magazine 21 can easily approach the pallet 22 mounted on the pallet mounting base 14 on the table 2. In the wire electric discharge machine according to the present invention, since the table 2 is attached to the bed 4 and is immovable, movement of the pallet by the container 24
The replacement can be performed at the same position on the wire electric discharge machine side. The pallet 22 is grasped and lifted by the container 24 by using the container arm 25, placed on the pallet mount 14 on the table 2, and thereafter the U-shaped wall surface 1c is lifted and processed with the fixed wall surface 1a. The tank 1 is formed and filled with a processing liquid to perform the next processing. Reference numeral 26 is a container arm
It is a rail that moves 25.

The operation of returning the bullet to the pallet magazine 21 from the wire electric discharge machine may be carried out in the reverse order. Since the structure and operation of the pallet magazine 21 are well known, detailed description will be omitted. Also, instead of the pallet magazine 21,
It is also possible to use an industrial robot that directly exchanges the work.

[0024]

As described above, according to the present invention, in the wire electric discharge machine, the wall surface on the back surface side surrounding the table 2 on which the work is placed is fixed to the table 2 and the machining tank 1 is formed. The table 2 is surrounded by a U-shaped 3 wall surface 1c except the back side wall surface so as to be integrally sealed, and when the work is exchanged, the sealing portion is opened to remove the machining liquid and the U-shaped 3 wall surface 1c. Since the work on the table 2 can be exchanged from three directions by lowering the workpiece, attachment work by opening the open / close door, which is a part of the processing tank as in the past, when exchanging the work Not only can the surroundings of the machine be prevented from being soiled due to the scattering of the liquid, but the need for an extra floor area due to the installation of an opening / closing door can be eliminated. Moreover, since the table 2 is immovable, the pallet exchange operation can be easily controlled, and the pallet magazine can be easily used together.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of a wire electric discharge machine according to the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a plan view of FIG. 1 showing a state in which a pallet magazine is installed side by side.

FIG. 4 is a side view showing a conventional wire electric discharge machine.

5 shows a front view of FIG.

FIG. 6 is a plan view of FIG. 4, showing an example in which a part of the processing tank is used as an opening / closing door.

[Explanation of symbols]

 1 processing tank 1a processing tank back wall surface 1b part of processing tank used as opening / closing door 1c U-shaped wall surface 2 table 3 saddle 4 bed 5 column 6 V-axis slider 7 U-axis slider 8 quill 9 upper head 10 arm 11 Lower head 12 Work mount 13 Wire electrode 14 Pallet mount 15 Rack 16 Pinion 17 Seal 18 Machining liquid tank 19 Machining liquid supply device 20 NC / power supply 21 Pallet magazine 22 Pallet 23 Chain 24 Container 25 Container arm 26 Rail

Claims (1)

[Claims] 1. A wire electric discharge machine for performing electric discharge machining by moving a wire electrode and a workpiece relative to each other while moving the wire electrode, a bed serving as a base, a table provided on the bed, and fixed on the table. A head for guiding a pair of lower wire electrodes, which is movable in two directions orthogonal to the X and Y axes with respect to the formed work, and one wall surface through which an arm holding the lower head penetrates and the other three wall surfaces. A wire electric discharge machine comprising: a machining tank formed by surrounding the table, and an elevating mechanism for elevating and lowering three wall surfaces of the machining tank.