JP4126861B2 - Cutout material takeout device for wire electric discharge machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a cutting material take-out device for a wire electric discharge machine, in which a cutting material cut out from a workpiece by wire electric discharge machining is attracted and taken out by a magnetic attraction force.
[0002]
[Prior art]
The material of the workpiece to be processed by the wire electric discharge machine is alloy tool steel or cemented carbide, etc., and most of them are magnetic materials, so the cutting material is taken out by using the magnetic attraction force of the magnet. This is usually done.
[0003]
FIG. 4 is a configuration diagram around an electromagnet that adsorbs a cutout material in a cutout material takeout device of a conventional wire electric discharge machine. In the figure, 1 is a magnet holder, and 2 is a magnetic adsorption means held by the magnet holder 1. A certain electromagnet, 3 is a workpiece base material, and 4 is a cutout material cut out from the workpiece base material 3 by wire electric discharge machining and adsorbed by the electromagnet 2. The magnet holder 1 is driven by driving means constituted by an actuator (not shown) such as an air cylinder and a servo motor, a transmission mechanism such as a ball screw and a spline shaft, and a linear guide, and the like, and an electromagnet 2 and a workpiece base material 3 are connected to each other. The relative positioning and the cutting material 4 adsorbed by the electromagnet 2 can be taken out.
[0004]
Next, the operation will be described. After the electromagnet 2 held on the magnet holder 1 and the workpiece base material 3 are positioned relative to each other by the driving means, the electromagnet 2 is excited by a direct current and cut from the workpiece base material 3 by wire electric discharge machining. The cutout material 4 is adsorbed by being brought into contact with the upper surface of the cutout cutout material 4. Next, after the cutting material 4 is taken out from the workpiece base material 3 by the driving means, it is transported to the upper part of a cutting material stocker (not shown). In this state, the exciting current of the electromagnet 2 is turned off, and the cutting material is dropped into the cutting material stocker.
[0005]
As a cutting material take-out device for such a conventional wire electric discharge machine, Japanese Patent Application Laid-Open No. 63-185531 discloses a shape of a cutting material by fixing a plurality of electromagnets on the entire surface and controlling a range of energization. A cut-out material take-out device for a wire electric discharge machine that obtains an electromagnetic attraction force adapted to the above is disclosed.
[0006]
Japanese Patent Application Laid-Open No. 4-129615 discloses a cutting material take-out device for a wire electric discharge machine having a configuration in which an electromagnet is incorporated in a nozzle.
[0007]
[Problems to be solved by the invention]
The magnetic attraction means of the conventional cutout material take-out device of the wire electric discharge machine as described above is composed of an electromagnet, a permanent magnet, or a combination of an electromagnet and a permanent magnet.
[0008]
FIG. 5 is an explanatory view showing a configuration example of an electromagnet and a permanent magnet used as magnetic adsorption means for adsorbing the cutout material 4, 2a and 2b are electromagnets, 4 is a cutout material, 4a is an adsorption surface of the cutout material 4, 5a and 5b are permanent magnets, 6 is an iron core, 7 is a coil, and 8 is a yoke.
[0009]
(A) or (b) of FIG. 5 shows a configuration of a magnetic attraction means for adsorbing the N and S poles in contact with the attraction surface 4a. When the distance between the N pole and the S pole is narrowed, magnetic lines of force are emitted from the free magnetic poles of the N pole and S pole, resulting in loss of magnetic energy, and the magnetic flux passing through the inside of the cutout material 4 is reduced and the magnetic attractive force is reduced. The interval between the N pole and the S pole cannot be reduced. Therefore, the magnetic attraction means having such a configuration is not suitable when the area of the attraction surface 4a is small.
[0010]
(C) or (d) of FIG. 5 shows the configuration of the magnetic attraction means for adsorbing the attracting surface 4a by bringing the N pole or the S pole into contact therewith. The magnetic attraction means having such a configuration is also suitable when the area of the attraction surface 4a is small. For example, even when the area of the adsorption surface 4a is about 20 mm ² , adsorption is possible.
[0011]
FIG. 6 is an explanatory view showing a process of taking out the cutout material 4 from the workpiece base material 3, and has a configuration in which the N pole or the S pole is brought into contact and adsorbed as shown in (c) or (d) of FIG. The case where the electromagnet 2b or the permanent magnet 5b which is a magnetic attraction means is used is shown. G schematically shows the direction of the lines of magnetic force.
[0012]
Since the cutout material 4 is a magnetic body, the cutout material 4 becomes a primary magnet and the direction of the lines of magnetic force is as shown in FIG. 6 in a state where it is attracted by the N pole of the electromagnet 2b or the permanent magnet 5b as shown in FIG. Accordingly, a magnetic attractive force is generated between the cutout material 4 and the workpiece base material 3.
[0013]
In the cutting material take-out device of the conventional wire electric discharge machine having such a configuration, the magnetic attraction force between the cutting material 4 and the workpiece base material 3 and the weight of the cutting material 4 are added, and the force is used as the electromagnet 2b. Or if it becomes larger than the magnetic attractive force between the permanent magnet 5b and the cutting material 4, the cutting material 4 will detach | leave from the electromagnet 2b or the permanent magnet 5b, and the extraction of the cutting material 4 will fail. Further, particularly when the workpiece is thick and the weight of the cutting material is heavy, the cutting material 4 and the workpiece base material are removed in the process of removing the cutting material 4 from the workpiece base material 3 as shown in FIG. 3 (A in the figure) does not become uniform over the entire circumference, so a moment (for example, the X axis in the figure) is generated in the cutout material 4 by the magnetic attractive force between the cutout material 4 and the workpiece base material 3. There is a problem that the reliability of taking out of the cutout material 4 is lowered, for example, the moment is increased and the moment is increased and the cutout material 4 is dropped.
[0014]
The present invention has been made in order to solve the above-described problems, and is applicable to a wire electric discharge machine that can be applied to a case where a cutting material adsorption area is small and can achieve high reliability of cutting material removal. It aims at obtaining the cutting material taking-out apparatus.
[0015]
[Means for Solving the Problems]
The cutting material take-out device of the wire electric discharge machine according to the present invention is the cutting material take-out device of the wire electric discharge machine that takes out the cutting material cut out from the workpiece by wire electric discharge machining by magnetic attraction force. Magnetic adsorption means for adsorbing the N pole or S pole in contact with the adsorption surface, at least one auxiliary electromagnet, relative positioning of the magnetic adsorption means and the workpiece, and adsorption by the magnetic adsorption means Drive means for taking out the cutout material, linear drive means for changing the relative position of the auxiliary electromagnet to the magnetic adsorption means, and the auxiliary electromagnet in the vicinity of the cutout material when the cutout material is attracted by the magnetic adsorption means The magnetic attraction means is configured so that the direction of the magnetic flux of the magnetic adsorption means and the direction of the magnetic flux of the auxiliary electromagnet are matched. Between the first control for exciting the auxiliary electromagnet so that the magnetic flux between the step and the cutout material increases, and from the predetermined intermediate state of taking out the cutout material from the workpiece to the completion of removal The auxiliary electromagnet is disposed in the vicinity of the workpiece, and the direction of the magnetic flux around the magnetic attraction means and the cutout material is reversed and the direction of the magnetic flux of the auxiliary electromagnet is reversed between the cutout material and the workpiece. And a control means for performing a second control for exciting the auxiliary electromagnet so that the magnetic flux decreases.
[0016]
In the cutout material takeout device for a wire electric discharge machine according to the present invention, the magnetic adsorption means is an electromagnet or a permanent magnet.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
1 is a configuration diagram of a cutout material take-out device for a wire electric discharge machine according to Embodiment 1 of the present invention, in which 1 is a magnet holder, 3 is a workpiece base material, and 4 is wire electric discharge machining. A cutout material 4a cut out from the workpiece base material 3, 4a is an attracting surface of the cutout material 4, 9 is an auxiliary electromagnet, 9a is a coil, 9b is a yoke, and 10 is a lower nozzle for guiding a wire electrode (not shown). 2b and 5b are the same as (c) and (d) of FIG. 5 of the prior art, that is, 2b is an electromagnet used as a magnetic attraction means configured to adsorb by contacting the N or S poles. Is a permanent magnet used as a magnetic attraction means configured to adsorb by contacting the N pole or the S pole. In the configuration of FIG. 1, an electromagnet 2b or a permanent magnet 5b is used as the magnetic attraction means.
[0018]
The magnet holder 1 is driven by driving means constituted by actuators such as air cylinders and servo motors (not shown), transmission mechanisms such as ball screws and spline shafts, linear guides, and the like, and electromagnets 2b or permanent magnets 5b as magnetic attraction means. And the workpiece base material 3 can be relatively positioned and the adsorbed cutout material 4 can be taken out.
[0019]
The auxiliary electromagnet 9 is disposed in the vicinity of the attracting surface 4a so as to cover the periphery of the electromagnet 2b or the permanent magnet 5b when the cutout material 4 is attracted as shown in FIG. From the middle of taking out from the base material 3 to the time when the take-out is completed as shown in FIG. 1B, it is arranged in the vicinity of the workpiece base material 3 so as to cover the periphery of the cutout material 4.
[0020]
In this way, the auxiliary electromagnet 9 is, for example, an air (not shown) so that the relative position between the auxiliary electromagnet 9 and the electromagnet 2b or permanent magnet 5b as magnetic attraction means can be changed in the direction of taking out the cutout material 4 (B direction in the figure). The electromagnet 2b or the permanent magnet 5b, which is a magnetic attraction means, is driven by a linear driving means constituted by a cylinder and a linear guide, or a ball screw, a servo motor and a linear guide.
[0021]
Further, predetermined control such as drive control of the drive means and linear drive means and excitation of the electromagnet 2b and the auxiliary electromagnet 9 is performed by control means (not shown).
[0022]
Next, the operation will be described. FIG. 2 is an operation explanatory view of the cutout material take-out device for the wire electric discharge machine according to Embodiment 1 of the present invention. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts. In FIG. 2, A is a gap between the cutout material 4 and the workpiece base material 3, G1 is a magnetic field line by the electromagnet 2b or the permanent magnet 5b, G2 is a magnetic field line by the auxiliary electromagnet 9 when the cutout material 4 is attracted, and G3 is the electromagnet 2b or Lines of magnetic force around the permanent magnet 5b and the cutout material 4, G4 shows lines of magnetic force generated by the auxiliary electromagnet 9 just before the cutout material 4 is taken out from the workpiece base material 3, and the direction of the lines of magnetic force is schematically shown.
[0023]
FIG. 2A shows a state immediately before the cutout material 4 is attracted by the electromagnet 2b or the permanent magnet 5b in order to take out the cutout material 4 from the workpiece base material 3. FIG. The electromagnet 2b or permanent magnet 5b and the auxiliary electromagnet 9 are arranged in the vicinity of the cutout material 4, and the direction of magnetic flux (magnetic line G1) by the electromagnet 2b or permanent magnet 5b and the direction of magnetic flux by the auxiliary electromagnet 9 (magnetic line G2) are set. Energize the electromagnet to match (so that the magnetic flux increases). By doing so, the magnetic attractive force acting on the cutout material 4 increases, for example, several times as much as that in the case of only the electromagnet 2b or the permanent magnet 5b, and as shown in FIG. Even when the cutout material 4 is dropped, the cutout material 4 can be more reliably attracted by the magnetic attraction force.
[0024]
FIG. 2B shows a state just before the extraction of the cutout material 4 from the workpiece base material 3 is completed. Since the relative position of the auxiliary electromagnet 9 and the magnet holder 1 and the electromagnet 2b or the permanent magnet 5b can be changed by the linear drive means, a predetermined intermediate state in which the cutout material 4 is removed from the workpiece base material 3 The auxiliary electromagnet 9 is arranged in the vicinity of the workpiece base material 3 until the removal is completed. The direction of the magnetic flux around the electromagnet 2b or the permanent magnet 5b and the cutting material 4 (magnetic line G3) and the magnetic flux generated by the auxiliary electromagnet 9 from the predetermined intermediate state of the cutting material 4 taken out from the workpiece base material 3 to the completion of the extraction. The auxiliary electromagnet 9 is excited so that the direction (magnetic line G4) is reversed (so that the magnetic flux decreases). By doing so, it is possible to suppress the magnetic attractive force acting on the gap (A in FIG. 2B) between the cutout material 4, the cutout material 4, and the workpiece base material 3. Accordingly, it is possible to reduce the moment that is related to the dropping of the cutout material 4 as described in FIG. 6 which is a problem to be solved by the invention. Further, since the magnetic attraction force acting on the gap between the cutout material 4 and the workpiece base material 3 is suppressed, even if the weight of the cutout material 4 is added to this magnetic attraction force, the cutout with the electromagnet 2b or the permanent magnet 5b is performed. It does not become larger than the magnetic attractive force acting between the material 4. Therefore, the cutout material 4 can be reliably taken out from the workpiece base material 3.
[0025]
As described above, excitation of the auxiliary electromagnet 9 is started so that the direction of the magnetic flux around the electromagnet 2b or the permanent magnet 5b and the cutout material 4 (magnetic line G3) and the direction of the magnetic flux by the auxiliary electromagnet 9 (magnetic line G4) are reversed. As for the predetermined intermediate state position of taking out the cutting material 4 from the workpiece base material 3, the optimum position differs depending on the plate thickness of the workpiece base material 3, the diameter of the wire electrode, the processing shape, etc. It can be obtained in advance by an experiment to take out the material 4. Alternatively, a predetermined position (for example, about 1/5 to 1/10 of the plate thickness of the workpiece base material 3) before the extraction of the cutout material 4 from the workpiece base material 3 is set as the predetermined intermediate state position. Good. Thus, before the cutout material 4 is extracted from the workpiece base material 3, the direction of the magnetic flux around the electromagnet 2b or permanent magnet 5b and the cutout material 4 (magnetic line G3) and the direction of the magnetic flux by the auxiliary electromagnet 9 (magnetic line G4). ), The auxiliary electromagnet 9 is excited so that the cutting material can be taken out with high reliability.
[0026]
In this way, the cutout material 4 reliably taken out from the workpiece base material 3 is conveyed to the upper part of a cutout material stocker (not shown) by the driving means. In this state, when using the electromagnet 2b as the magnetic attraction means, the exciting current of the electromagnet 2b is turned off and the cutout material 4 is dropped into the cutout material stocker. Further, when the permanent magnet 5b is used as the magnetic attraction means, the auxiliary electromagnet 9 is moved to the vicinity of the permanent magnet 5b by the linear drive means, and the magnetic flux in the direction opposite to the direction of the magnetic flux of the permanent magnet 5b is generated. When the electromagnet 9 is excited, the magnetic attractive force acting on the cutout material 4 is reduced to the weight of the cutout material 4 or less, and the cutout material 4 is dropped into the cutout material stocker. In this case, the direction, time, and maximum value of the current passed through the auxiliary electromagnet 9 are controlled by the control means so that the permanent magnet 5b is not demagnetized.
[0027]
As described above, the magnetic attractive force acting on the cutout material 4 is increased at the time of adsorption, and when the end of the cutout material 4 comes out of the workpiece base material 3, the cutout material 4 is interposed between the cutout material 4 and the workpiece base material 3. Since the working magnetic attraction force is reduced, it is possible to eliminate the inability to adsorb the cutout material 4 or the dropout of the cutout material 4 during extraction. Therefore, it is possible to increase the reliability of taking out the cutout material 4 from the workpiece base material 3. For example, even when the area of the suction surface 4a of the cutout material 4 is as small as about 20 mm ² and the length of the cutout material 4 (the thickness of the workpiece base material 3) is as long as about 50 mm, the work piece of the cutout material 4 Removal from the base material 3 can be performed reliably.
[0028]
In the above, when the permanent magnet 5b is used as the magnetic attraction means, there is an effect that the cutout material 4 can be prevented from dropping at the time of a power failure.
[0029]
Moreover, although the case where the electromagnet 2b or the permanent magnet 5b is used as the magnetic attraction means has been described above, a primary magnet other than an electromagnet such as magnetized electromagnetic soft iron may be used as the magnetic attraction means.
[0030]
Embodiment 2. FIG.
FIG. 3 is a configuration diagram of a cutout material takeout device for a wire electric discharge machine according to Embodiment 2 of the present invention. The same reference numerals as those in FIG. 1 of Embodiment 1 denote the same or corresponding parts. In FIG. 3, 11 is a second auxiliary electromagnet, 11a is a coil, 11b is a yoke, and a permanent magnet 5b is used as magnetic attraction means.
[0031]
The operation of the auxiliary electromagnet 9 is the same as that in FIG. 2 of the first embodiment. The second auxiliary electromagnet 11 is arranged in the vicinity of the permanent magnet 5b and the auxiliary electromagnet 9 when the cutout material 4 is attracted as shown in FIG. 3A, and the direction of the magnetic flux by the permanent magnet 5b and the auxiliary electromagnet 9 are used. Excitation is performed so that the magnetic flux further increases in addition to the direction of the magnetic flux. By doing so, the magnetic attractive force acting on the cutout material 4 is further increased, and even when the weight of the cutout material 4 is heavier, the cutout material 4 can be more reliably adsorbed. The reliability of taking out the material 4 is further improved.
[0032]
When the second auxiliary electromagnet 11 is used in this way, the relative position between the second auxiliary electromagnet 11 and the permanent magnet 5b is fixed as shown in FIGS. After the cutout material 4 is taken out, the cutout material 4 is conveyed to the upper part of the cutout material stocker, and the second auxiliary electromagnet 11 is excited so as to generate a magnetic flux in a direction opposite to the magnetic flux direction of the permanent magnet 5b. It can be dropped into the stocker.
[0033]
Further, the relative position between the second auxiliary electromagnet 11 and the permanent magnet 5b may be made variable so that it can be moved in the same manner as the auxiliary electromagnet 9.
[0034]
In the above, the case where two auxiliary electromagnets 9 and second auxiliary electromagnets 11 are used as auxiliary electromagnets has been described. However, the number of auxiliary electromagnets is not limited to two, and three or more auxiliary electromagnets are used. May be used.
[0035]
【The invention's effect】
Since the cutout material take-out device of the wire electric discharge machine according to the present invention is configured as described above, the cutout material can be applied to a case where the cutout material adsorption area is small or the cutout material is heavy. There is an effect that it is possible to increase the reliability of the removal.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a cutout material takeout device for a wire electric discharge machine according to Embodiment 1 of the present invention;
FIG. 2 is an operation explanatory view of a cutout material takeout device for a wire electric discharge machine according to Embodiment 1 of the present invention;
FIG. 3 is a configuration diagram of a cutout material takeout device for a wire electric discharge machine according to Embodiment 2 of the present invention;
FIG. 4 is a configuration diagram around an electromagnet that adsorbs a cutout material in a cutout material takeout device of a conventional wire electric discharge machine.
FIG. 5 is an explanatory view showing a configuration example of an electromagnet and a permanent magnet used as magnetic attraction means.
FIG. 6 is an explanatory view showing a process of taking out the cut-out material from the workpiece base material.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Magnet holder, 2b Electromagnet, 3 Workpiece base material, 4 Cutout material, 4a Adsorption surface, 5b Permanent magnet, 9 Auxiliary electromagnet, 9a Coil, 9b Yoke, 10 lower nozzle, G1, G2, G3, G4 Magnetic field lines.

Claims (2)

In the cutting material take-out device of the wire electric discharge machine, the cutting material cut out from the workpiece by wire electric discharge machining is picked up by the magnetic attraction force.
Magnetic adsorption means for adsorbing the N pole or S pole in contact with the adsorption surface of the cutout material;
At least one auxiliary electromagnet;
Driving means for performing relative positioning between the magnetic adsorption means and the workpiece and taking out the cut-out material adsorbed by the magnetic adsorption means;
Linear drive means for varying the relative position of the auxiliary electromagnet with respect to the magnetic adsorption means;
The auxiliary electromagnet is disposed in the vicinity of the cutout material when the cutout material is attracted by the magnetic attraction means, and the magnetic attraction means and the magnetic flux at the auxiliary electromagnet are aligned with the magnetic attraction means and the auxiliary electromagnet. A first control for exciting the auxiliary electromagnet so as to increase a magnetic flux between the cutout material and the auxiliary electromagnet between a predetermined intermediate state of taking out the cutout material from the workpiece and completion of the removal. Is disposed in the vicinity of the workpiece, and the magnetic flux between the cutting material and the workpiece is reversed by reversing the direction of the magnetic flux around the magnetic attraction means and the cutting material and the direction of the magnetic flux of the auxiliary electromagnet. And a control means for performing second control for exciting the auxiliary electromagnet so as to decrease. 2. The apparatus for taking out a cut material from a wire electric discharge machine according to claim 1, wherein the magnetic adsorption means is an electromagnet or a permanent magnet.

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