JP2681322B2 - Wire cut 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 cut electric discharge machine, and more particularly to a wire cut electric discharge machine equipped with a device for automatically taking out a cut work.

[0002]

2. Description of the Related Art FIG. 6 is a front view showing an example of a conventional cut-out work take-out device of a wire cut electric discharge machine, a part of which is shown in section. 1 is a work machined by a wire cut electric discharge machine, 2 is a cut-out work cut out from the work 1, 3 is a work fixing base, 4 is a work fixing metal,
Reference numeral 5 is a fixing screw for fixing the work fixing metal 4, and 6 is a lower nozzle for supplying a working liquid. Reference numeral 7 is an arm, and 8 is a magnet attached to the tip of the arm 7 by a mounting screw 9. Reference numeral 10 is a cylinder for moving the arm 7 up and down, 11 is a stepped shaft, 12 is a spring, 13 is a stopper, and 14 is a mounting screw.

FIG. 7 is a machining liquid supply circuit diagram of a wire-cut electric discharge machine equipped with the cut-out workpiece take-out device shown in FIG. Reference numeral 15 is an upper nozzle of the wire cut electric discharge machine, 16 is a machining liquid supply source, and 17 is a valve for controlling the supply of the machining liquid. 18 is a valve 1 from the machining liquid supply source 16
Reference numeral 19 denotes a first machining liquid supply passage that passes through the No. 7 and is connected to the upper nozzle 15, and 19 is a second machining liquid supply passage that is branched from the first machining liquid supply passage 18 and connected to the lower nozzle 6. 20,2
1 is the first provided in the first machining liquid supply passage 18, respectively.
Check valve and the first flow rate adjusting valve. Also, 2
Reference numerals 2 and 23 are a second check valve and a second flow rate adjusting valve provided in the second machining liquid supply passage 19, respectively.

Next, the operation of the wire-cut electric discharge machine and the cut-out work taking-out device thereof constructed as described above will be described. First, as shown in FIG. 6, the work 1 is placed on the work fixing base 3, and the work fixing metal 4 and the fixing screw 5 are placed.
Is fixed on the work fixing base 3. After that, the work 1 is processed into a desired shape by wire cut electric discharge machining. At this time, the cut-out work 2 cut out from the work 1 is supported by the lower nozzle 6 as shown in FIG.
Do not fall. The working fluid used for working passes through the opened valve 17 as shown in FIG. 7, and passes through the first check valve 20, the first flow rate adjusting valve 21, the second check valve 22, and the second flow rate adjusting. While being adjusted by the valve 23, the liquid is supplied from the machining liquid supply source 16 to the upper nozzle 15 and the lower nozzle 6 through the first machining liquid supply passage 18 and the second machining liquid supply passage 19, and then discharged.

When the arm 7 is lowered from the solid line to the position shown by the alternate long and short dash line by the cylinder 10 while the cut-out work 2 is supported by the lower nozzle 6, the magnet 8 attached to the arm 7 comes into contact with the work 1. The magnet 8 attracts the work 1 and the cut-out work 2. Thus, cylinder 1
When the arm 7 is again raised to the position indicated by the solid line by 0, the work 1 fixed by the work fixing metal 4 remains as it is, and only the cut work 2 is taken out to the upper part.

[0006]

The conventional cut-out work take-out device of the wire-cut electric discharge machine constructed as described above has a cut-out work 2 as shown in FIG.
Is buried in the work 1 and located below, the magnet 8
There is a case in which the cut-out work 2 cannot be adsorbed because the cut-out work 2 does not come into contact with the cut-out work 2 even when the work piece 1 descends and comes into contact with the work 1. Further, when the magnet 8 descends, the attracting force also acts on the work 1 in the fixed state in addition to the cut-out work 2, so that the position of the work 1 shifts when the arm 7 is raised and the cut-out work 2 is taken out. There was a problem.

The present invention has been made to solve the above problems, and even if a cut-out work is buried in the work, it can be adsorbed and easily taken out. An object of the present invention is to obtain a wire cut electric discharge machine equipped with a cut-out work take-out device capable of reducing the force and preventing the work from being displaced.

[0008]

In a wire cut electric discharge machine according to the present invention, a magnet for attracting a cut-out work is attached to an arm, a non-magnetic spacer is provided on the outer periphery of the magnet, and the lower surface of the magnet is A cut-out work take-out device that is located above the lower surface of the non-magnetic spacer, discharges the machining liquid from the nozzle provided in the lower part of the cut-out work, and lifts the cut-out work by the discharge force to attract it to the magnet. Be prepared.

The wire-cut electric discharge machine according to the present invention includes a magnet provided on an arm for adsorbing a cut-out work, a first valve, a first check valve, and a first flow rate control valve from a machining liquid supply source. A first machining liquid supply path connected to the upper nozzle via the first nozzle, a second check valve branched from the first machining liquid supply path, and a second nozzle connected to the lower nozzle via the second flow control valve. Second machining fluid supply path, and third machining fluid supply connected from the machining fluid supply source to the second machining fluid supply path through the second valve, the third check valve, and the third flow rate adjusting valve. A machining liquid supply means including a passage is provided, and the machining liquid is discharged from the lower nozzle via the third machining liquid supply passage, and the discharge work force lifts the cutout work to attract it to the magnet.

[0010]

[Function] The magnet is lowered to bring the non-magnetic spacer into contact with a work other than the cut work so that the magnet and the work are not directly attracted to each other. Then, the machining liquid is discharged from the lower nozzle and the cut work is used to discharge the cut work. Lift and stick to the magnet. When the machining of the work is finished, the first and second machining liquid supply passages are closed, and the machining liquid is supplied to the lower nozzle only from the third machining liquid supply passage to be discharged.
Lift up the cut-out work.

[0011]

Embodiment 1 FIG. 1 is a front view of a first embodiment of the present invention including a partial cross section, and FIG. 2 is a working fluid supply circuit diagram of FIG. The same parts as those in the conventional example shown in FIGS. 6 and 7 are designated by the same reference numerals, and the description thereof will be omitted. In FIG. 1, 8 is a magnet attached to the arm 7 for adsorbing the cut-out work 2, and 24 is a magnet 8.
A non-magnetic spacer 25 is attached to the outer periphery of the spacer 7, and 25 is a spacer attaching screw for attaching the spacer 24 to the arm 7. Reference numeral 26 is a side air gap portion formed between the magnet 8 and the spacer 24, and 27 is a bottom air gap portion. The lower surface 8a of the magnet 8 is slightly moved upward with respect to the lower surface of the spacer 24 to form a step. By mounting, a gap is provided between the magnet 8 and the work 2 to reduce the attraction force exerted on the part of the work 1 other than the cut-out work 2 and prevent the work 1 from being displaced when taking out the cut-out work 2.

In FIG. 2, reference numeral 28 is a valve for independently ejecting the working liquid from the lower nozzle 6. Reference numeral 29 is a third machining fluid supply passage which connects the machining fluid supply source 16 and the second machining fluid supply passage 19 through the valve 28, and 30, 3.
Reference numeral 1 denotes a third check valve and a third flow rate adjusting valve provided in the third machining liquid supply passage 29, respectively.

Next, the operation of the first embodiment constructed as described above will be described. First, the work 1 is placed on the work fixing base 3 and fixed by the work fixing metal 6 and the fixing screw 4. Next, the valve 17 is opened, the machining liquid is ejected from the lower nozzle 6 and the upper nozzle 15, and the work 1 is cut into a desired shape by wire-cut electric discharge machining and processed. The valve 28 is closed during processing. When the processing is completed, the valve 17 is closed and the supply of the processing liquid to the lower nozzle 6 and the upper nozzle 15 is stopped. At this time, the cut-out work 2 cut out from the work 1 is the lower slide 6
Supported by and does not fall downward. Next, when the arm 7 of the cut-out work extracting device is lowered by the cylinder 10 from the position indicated by the solid line to the position indicated by the alternate long and short dash line, the lower surface of the spacer 24 attached to the outer periphery of the magnet 8 contacts the work 1.

At this time, the valve 28 shown in FIG. 2 is opened,
When the working liquid is supplied to the lower nozzle 6, the cut-out work 2 is lifted by the discharging force of the working liquid and attracted to the magnet 8. Then, the valve 28 is closed to stop the supply of the working fluid to the lower nozzle 6, and the cylinder 10 raises the arm 7 to the position shown by the solid line again. As shown in FIG. 3, the cut-out work 2 is taken out to the upper part. .

Embodiment 2 FIG. 4 is a front view showing a second embodiment of the present invention partially shown in section. 32 is a screw shaft which moves up and down by the cylinder 10, 33 is a variable stopper attached to the screw shaft 32, and 34 is a lock nut. Reference numeral 35 is a fixed metal for preventing the arm 7 from descending by a predetermined amount or more, and is a variable stopper 3
It is adjusted so that a predetermined amount of air gap is generated between the magnet 8 and the work 1 when the 3 comes into contact with the fixed metal 35. That is, in the first embodiment, the spacer 24 is interposed between the magnet 8 and the work 1 to reduce the attraction force exerted by the magnet 8 on the work 1 other than the cut-out work 2, but the second embodiment. In the example, the work 1 is used instead of the spacer 24.
There is provided a mechanism that creates an air gap between the magnet and the magnet 8.

Next, the operation of the second embodiment constructed as described above will be described. First, the work 1 is fixed on the work fixing base 3 and processed into a desired shape by wire cut electric discharge machining. Next, when the arm 7 of the cut-out work take-out device is lowered by the cylinder 10, the variable stopper 33 comes into contact with the fixed metal 35 and stops at the position shown by the alternate long and short dash line after a certain distance. At this time, a certain amount of air gap is generated between the magnet 8 and the work 1. In this way, when the working liquid is discharged from the lower nozzle 6, the cut-out work 2 is lifted by the discharging force of the working liquid and is attracted to the magnet 8. Then, the discharge of the machining liquid is stopped and the cylinder 10
When the arm 7 is again raised to the position indicated by the solid line by
The cut-out work 2 is taken out to the upper part in a state where the suction force exerted on the work 1 other than the cut-out work 2 is reduced.

Embodiment 3 FIG. 5 is a front view showing a third embodiment of the present invention, a part of which is shown in cross section. Reference numeral 36 is a nut screwed to the feed screw 38, and 7a is an arm attached to the nut 36 with a bolt 37. Numerals 39 and 40 are supporters into which the feed screw 38 is screwed and hold it. 41 is a motor, 42 is a coupling, and the rotation of the motor 41 is the coupling 42
Is transmitted to the feed screw 38 via the and is converted into the vertical movement of the nut 36. The rotation speed of the motor 41 and the nut 3
The lowering stroke of 6 is set so that an air gap is formed between the magnet 8 and the work 1 when the motor 41 is rotated to lower the arm 7a.

Next, the operation of the third embodiment constructed as above will be described. First, the work 1 is fixed on the work fixing base 3 and processed into a desired shape by wire cut electric discharge machining. Next, when the motor 41 of the cut-out work take-out device is rotated, the rotation is transmitted to the feed screw 38 via the coupling 42, and the nut 36 descends by a preset distance to the position shown by the one-dot chain line. Stop at. At this time, a certain amount of air gap is generated between the magnet 8 and the work 1. In this way, when the working liquid is discharged from the lower nozzle 2, the cut-out work 2 is lifted by the discharging force of the working liquid and attracted to the magnet 8. Then
When the discharge of the machining liquid is stopped and the motor 41 is rotated to raise the arm 7a to the position indicated by the solid line again, the cut-out work 2 is moved upward with the suction force exerted on the work 1 other than the cut-out work 2 reduced. Taken out.

[0019]

As is apparent from the above description, according to the present invention, the machining liquid is discharged from the lower nozzle of the wire cut electric discharge machine, and when the cutting work is lifted by the discharge force to attract the magnet to the magnet, Since a non-magnetic spacer is attached to the periphery to prevent the magnet and the work from being directly attracted, the attraction force exerted on the work other than the cut work is reduced, so that the fixing force of the work can be reduced. Further, it is possible to prevent the displacement of the work when the cut-out work is taken out. Furthermore, the load on the arm when removing the cut-out work is also reduced,
The rigidity of the arm can be reduced.

Conventionally, the working fluid is always discharged from both the upper nozzle and the lower nozzle, but in the present invention, the third working fluid supply path is provided in the working fluid supply means to the upper nozzle and the lower nozzle. When the cut-out work is taken out, the cutting-out work can be reliably taken out because the cutting-out work is lifted by supplying the working liquid only to the lower nozzle from the third working-solution supply path and discharging the cut-out work. ,Also,
Processing fluid can be saved.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

2 is a working fluid supply circuit diagram of FIG. 1. FIG.

FIG. 3 is an explanatory view of the operation of FIG.

FIG. 4 is a front view showing a second embodiment of the present invention.

FIG. 5 is a front view showing a third embodiment of the present invention.

FIG. 6 is a front view showing an example of a conventional cut-out workpiece removing device.

7 is a working fluid supply circuit diagram of FIG. 6;

FIG. 8 is an operation explanatory view of a conventional cut-out work take-out device.

[Explanation of symbols]

 1 Work 2 Cutout Work 6 Lower Nozzle 7, 7a Arm 8 Magnet 10 Cylinder 24 Spacer 27 Bottom Air Gap 28 Valve 33 Variable Stopper 41 Motor

Claims (2)

(57) [Claims] 1. A magnet for attracting a cut-out work is attached to an arm, a non-magnetic spacer is provided on an outer periphery of the magnet, and a lower surface of the magnet is positioned above a lower surface of the non-magnetic spacer. A wire-cut electric discharge machine characterized in that a machining liquid is discharged from a nozzle provided below the cut-out work, and the cut-out work is lifted by the discharge force to be attracted to the magnet. 2. A magnet provided on an arm for adsorbing a cut-out work and a first nozzle connected from a machining liquid supply source to an upper nozzle via a first valve, a first check valve, and a first flow rate adjusting valve. Machining fluid supply passage, a second machining fluid supply passage branched from the first machining fluid supply passage and connected to the lower nozzle via a second check valve and a second flow rate adjusting valve, and the machining fluid. A machining fluid supply means is provided that includes a third machining fluid supply passage connected to the second machining fluid supply passage from a supply source through a second valve, a third check valve, and a third flow rate control valve. Then, the machining liquid is discharged from the lower nozzle via the third machining liquid supply path, and the discharge force raises the cut-out work to be attracted to the magnet. Machine.