JP3420833B2 - Core processing equipment of wire 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 core processing device for a wire electric discharge machine for performing electric discharge machining by moving a wire electrode laterally and moving the wire electrode and a workpiece relative to each other.

[0002]

2. Description of the Related Art In a conventional wire electric discharge machine, electric discharge machining is performed by moving a wire electrode in a vertical direction while moving the wire electrode and a work piece relative to each other. If the arm is erroneously moved while penetrating the wall of the processing tank from the column and protruding into the processing tank and the lower head provided at the tip of the arm, the arm and the lower head may be damaged. is there. Therefore, a program is created so that the electric discharge machining is stopped at a position slightly before the position where the core is separated from the work, and the worker performs the process of separating the core. This is a big problem in performing the automated operation of the wire electric discharge machine.

As a first technique for solving the above problem, the applicant of the present application has proposed a core processing device for a wire electric discharge machine in Japanese Patent Laid-Open No. 4-63629. This apparatus applies a predetermined voltage between a magnet that attracts a core in an electric discharge machined work and the work, and at least one of them is perpendicular to the wire electrode feed direction so that the work and the core come into contact with each other. The core is reliably moved by determining whether the core is attracted to the magnet according to the presence or absence of electrical contact between the workpiece and the core after being moved in a predetermined direction. .

As a second technique for solving the above problem, the applicant of the present application has proposed a core processing device for a wire electric discharge machine in Japanese Patent Laid-Open No. 4-87723. This device is a head that straddles the work and the core that are adjacent to each other with the cutout line that has already been formed as a boundary in a state where the core is cut off in the work after electric discharge machining. The magnet suspended so that it can move freely with respect to the arm provided on the base that supports the core is attracted, and in that state, the cutting-off portion of the core is processed again and cut, and the work and the core are separated from the magnet. In the adsorbed state, the separating portion is returned to the position before the cutting, and then the core adsorbed by the magnet is lifted by the arm and pulled out from the work in front of the core.

[0005]

However, in a wire electric discharge machine for performing electric discharge machining by moving the wire electrode and the work piece relative to each other while moving the wire electrode laterally, the wire electric machine is separated from the work piece after electric discharge machining. Since the core falls a minute distance and is supported by the outer part of the work, there is no concern that the core will fall into the head, and the electric discharge machining is stopped at a position slightly before the position where the core is separated from the work. The worker does not need to perform the process of separating the core. Therefore, as in the first conventional technique, a predetermined voltage is applied between the magnet that attracts the core in the work after electric discharge machining and the work, and the core is determined according to the presence or absence of electrical contact between the magnet and the work. As in the second prior art, in which the core treatment is performed by determining whether or not is attracted to the magnet.
A base for supporting the head across the work and the core that are adjacent to each other with the cutout line already formed as a boundary in a state where the core is cut off in the work after electric discharge machining. Adsorb a magnet that is movably suspended to an arm provided on a table, and in that state, cut the core separation part again to cut it, and in the state where the work and the core and the magnet are attracted. There is no need to adopt a method of returning the cutting portion to the position before cutting and then lifting the core adsorbed to the magnet by the arm and pulling it out from the work in front of the core.

However, if the core separated from the work after electric discharge machining is not removed and is supported by the outer portion of the work, the core may drop from the work and damage the head for some reason. There is also a possibility. Therefore, it is an object of the present invention to provide a core processing device of a wire electric discharge machine which can surely remove the core in the work with a simple structure.

[0007]

According to a first aspect of the present invention, there is provided a wire electric discharge machine for performing electric discharge machining by relatively moving a wire electrode and a workpiece while laterally moving the wire electrode. respectively provided on both sides, said with the wire electrode travels allow guided on at least one of the heads of the pair of head which moves the workpiece relative discharge machining is completed the wire electric
It is characterized by comprising a pressurized fluid jetting means for laterally jetting a pressurized fluid toward the core remaining in the work after cutting and collecting the poles and removing the core from the work. The core of the wire electric discharge machine is

[0008]

With the above structure, the head and the workpiece are moved relative to each other after the electric discharge machining, and the center position of the pressurized fluid ejecting means provided on one of the pair of heads is left inside the workpiece. The core is moved to the center of gravity, and a pressurized fluid such as air or processing liquid is jetted toward the core to blow and remove the core from the work. After that, when continuing the machining and starting a new machining, when the work is moved to a position where the wire electrode is loaded in the machining start hole of the work, the core remaining in the work and the pair When the contact with any one of the heads is detected, the head and the work are relatively moved again, and the center position of the pressurized fluid ejecting means provided in any one of the pair of heads is set to the work. The core is moved to the position of the center of gravity of the core, and a pressurized fluid such as air or a working liquid is again jetted toward the core, and the core is blown and removed from the work.

[0009]

Embodiments 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. However, if it is possible to make design changes, 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. 3 is a front view showing a wire electric discharge machine according to an embodiment of the present invention. Each member will be described according to the traveling path of the wire electrode 1. 3 is a wire supply bobbin, a and b are guide rollers, and 5 is a wire payout device equipped with a wire payout motor M1 for driving a wire payout roller c. The feeding device 5 is swingably provided around a turning shaft (not shown) provided at one corner.
As described above, when the wire feeding motor M1 is driven in a state of being engaged with the wire feeding roller c, the wire feeding roller c sandwiches the wire electrode 1 with the endless belt 6, and the endless belt 6 The wire electrode 1 is paid out from the wire supply bobbin 3 by rotating together. Reference numeral d denotes a dancing roller pivotally supported at one end of the swing arm 7. An angle sensor 9 is attached to a rotation support shaft of the swing arm 7, and the wire is fed out according to an output generated in response to the swing of the swing arm 7. The motor M1 is controlled. Reference numeral 11 denotes a wire tension adjusting weight that is slidable on the swing arm 7. By moving the wire tension adjusting weight 11 along the swing arm 7 to change the mounting position, an axis is attached to one end of the swing arm 7. The dancing roller d supported
The weight applied to the wire electrode 1 is adjusted to adjust the tension applied to the wire electrode 1.

Reference numeral e is a guide roller, and f and g are a pair of wire feeding rollers attached to the wire feeding device 13 for guiding the end portion of the wire electrode 1 to the wire feeding nozzle 15 by a pressurized air flow. f is driven by the wire feed motor M2 via a one-way clutch (not shown). Note that g is a pinch roller. The wire feeding device 13 includes a pair of wire feeding rollers f and g, a wire feeding motor M2, a wire feeding nozzle 15 and a wire cutter (not shown). The wire feeding nozzle 15 is attached to the wire feeding device 13, the direction of the wire feeding nozzle 15 occupies the vertical position during processing, its vertical center line coincides with the tangent line of the wire pressing roller h, and the wire electrode 1 is the wire electrode 1. The direction is changed by 90 ° along the peripheral surface of the pressing roller h, and is linearly directed to the processing start hole of the work 17.

The work head 19 is moved in the X and Y axis directions, and the machining start hole of the work 17 is adjusted so as to be carried over to a position directly opposite to the moving direction of the wire feeding nozzle 15 which is horizontally swung. When the tip of the wire electrode 1 is sent to the wire sending nozzle 15 by the wire sending rollers f and g, pressurized air rapidly flows, the wire electrode 1 is placed on the air flow and is transferred, and a machining start hole for the work 17 is formed. And the wire electrode 1 is loaded. In FIG. 3, the work head 19 has a forward-backward movement direction as an X-axis and a vertical movement direction as a Y-axis, and the work head 19 includes a swivel base 23 that constitutes a B-axis that can be rotationally positioned around the Y-axis. The swivel base 23 is the chuck 2
1 holds the work holder 25 and the work 17. Therefore, the workpiece 17 can be moved and rotated along the X axis, the Y axis, and the B axis, and the B axis is used for machining the outer periphery of a curved surface such as a cylinder.
It is used when electric discharge machining is performed by rotating the wire electrode 7 and causing the wire electrode 1 to travel tangentially.

Reference numeral 27 is a right head, and 29 is a left head, which are provided at the left and right positions with the work 17 sandwiched therebetween.
They are attached to the tips of the support arms 41 projecting from the substrate 9, and are immersed in the processing liquid filled in the processing tank 31 provided on the bed 43. Wire electrode 1 for work 17
The upstream head in the traveling direction of is a right head 27, which can be moved left and right (Z axis direction), and the Z axis movement of the right head 27 is performed according to the thickness of the work 17. The auxiliary feed axes parallel to the X-axis, Y-axis and Z-axis of the wire electric discharge machine according to the embodiment of the present invention are referred to as U-axis, V-axis and W-axis. The left head 29, which is the downstream side head of the wire electrode 1 with respect to the work 17, can move along the U axis and the V axis, and the movement of the left head 29 is such that the work 17 is tapered. It is done at the time of.

The machining tank 31 is the bed 4 of the wire electric discharge machine.
3, the machining tank frame can be moved up and down, and the machining tank 31 is filled with the machining liquid at the elevated position of the machining tank frame to immerse the electric discharge machining unit in the machining liquid. Also,
When the wire electrode 1 is loaded, the processing tank frame descends and the work 1
Widen the space around 7.

Reference numeral i denotes a wire pressing roller provided at a position substantially symmetrical to the wire pressing roller h with respect to the work 17, and in FIG. 3, it is shown at a fixed position (during processing). It can move up and down between the up and down positions. Although not shown, in the space where the wire pressing roller i retreats from the fixed position, the wire suction means 63 having a link mechanism enters,
By retracting, the tip of the wire electrode 1 that has passed through the machining start hole of the work 17 is picked up, and the wire electrode 1 is collected by the wire collecting device 35 via the wire drawing device 33 composed of a pair of drawing rollers j and k. Guide to the cylinder 65.
A suction airflow exists in the recovery port of the wire recovery cylinder 65, and the wire electrode 1 is sucked into the wire recovery cylinder 65 by the airflow and is accommodated in the wire recovery device 35. j and k are a pair of pulling rollers, and the pulling roller j is driven by a pulling motor M3. The pulling roller k is a pinch roller, which circumscribes the pulling roller j and sandwiches the wire electrode 1 only during machining of the wire electric discharge machine of this embodiment, and functions as a pinch roller of the pulling roller j. The wire pulling device 33 includes pulling rollers j and k and a pulling motor M3. In this way, the wire electrode 1 on which the work 17 has been processed is fed out from the wire supply bobbin 3 and accommodated in the wire recovery device 35. The device 37 installed on the right side of the wire electric discharge machine according to the embodiment of the present invention is an NC / power supply control device that performs various controls related to the machining power supply and machining.

FIG. 4 is a left side view of the wire electric discharge machine of the embodiment of the present invention shown in FIG. Reference numeral 17 is a work, 19 is a work head, and the work head 19 is held by a column 39 and is provided so as to be movable in the X-axis and Y-axis directions. A saddle 45 is provided on the column 39 so as to be vertically movable (Y-axis direction).
The ram 47 to which 9 is attached can be moved back and forth (X axis direction), and the work head 19 can be moved along the X axis and the Y axis. 23 is a swivel with chuck 21;
Reference numeral 9 denotes a left head, which is provided at an end portion of a support arm 41 projecting from the column 39 into the processing tank 31 provided on the bed 43. The support arm 41 provided with the left head 29 can be moved back and forth along the U axis and up and down along the V axis, so that the column 3 can be moved.
9 is provided. The support arm 41 provided with the right head 27 is provided on the column 39 so as to be movable along the Z axis. 49 is an automatic work changer,
The workpiece holder 53 having a plurality of grippers 51, a moving base 55, a moving base 57, and a W-axis motor 59 having a feed screw are provided. In FIG. 4, the workpiece holder 25 corresponding to the height position of the gripper 51 is provided. The position is the workpiece exchange position in the Y-axis direction.

FIG. 5 is a plan view of the wire electric discharge machine according to the embodiment of the present invention shown in FIG. 19 is a work head, h,
i is a wire pressing roller for guiding the wire electrode 1 with the work sandwiched therebetween, 27 is a right head, 29 is a left head, 31 is a machining tank for immersing the electric discharge machining part in the machining liquid, j is a wire pulling roller, 35 is a wire collecting device,
37 is an N for performing various controls related to the machining power source and machining
C. Power supply control device. Reference numeral 49 denotes an automatic work changing device which drives the W-axis motor 59 to reciprocate the work placement table 53 having the gripper 51 in the left-right direction, that is, in the W-axis direction.
Can be slid. Reference numeral 61 is a feed screw mechanism. In FIG. 5, the center position of the work head 19 is the work exchange position in the Z-axis direction. Reference numeral 63 is a wire suction device having a link mechanism, which sucks the tip of the wire electrode 1 inserted through the machining start hole of the work 17 from the wire feeding device 13 and carries it over to the wire recovery device 35.
The function of delivering the wire to the recovery port of the wire recovery cylinder 65 of the wire recovery device 35 is achieved.

With the above description, the description of the schematic structure of the wire electric discharge machine according to the embodiment of the present invention and the interrelationship between the respective constituent members is completed, and the core processing apparatus of the wire electric discharge machine according to the present invention will be described below. explain. FIG. 1 is an enlarged plan view and a configuration block diagram showing a head portion of a wire electric discharge machine equipped with a core processing apparatus according to an embodiment of the present invention, and FIG. 2 is provided with a core processing apparatus according to an embodiment of the present invention. It is an expansion perspective view which shows the head part of the wire electric discharge machine. An outline of the operation of the core processing device of the wire electric discharge machine according to the embodiment of the present invention will be described below with reference to FIGS. After the electric discharge machining is completed, the wire electrode 1 inserted in the work 17 is cut by a wire cutter (not shown) attached to the wire feeding device 13 (step S1), and the wire electrode 1 on the downstream side from the wire cutter is wire-cut. Recovery device 35
Is recovered from the wire recovery cylinder 65 (step S2). The work 17 suspended and held by the work holder 25 and the heads 27 and 29 are moved relative to each other, and the center position of the machining fluid injection nozzle 67 provided in the left head 29 is calculated by the center-of-gravity position calculation device 73. The core 69 left inside is moved to the center of gravity position (step S3), and the pressurized fluid ejecting device 75 ejects a pressurized fluid such as air or machining fluid from the machining fluid injection nozzle 67 toward the core 69. (Process S
4) The core 69 is blown away from the work 17 and removed (step S8). After that, when the machining is continued or when a new machining is performed (step S5), the work 17
Is moved to a position where the wire electrode 1 is loaded in the processing start hole of the work 17 (step S6), the core 69 left in the work 17 and the contact sensing plates provided on the heads 27 and 29, respectively. When the contact with 71 is sensed (step S7), the heads 27, 29 and the work 17 are moved relative to each other, and the center position of the machining liquid injection nozzle 67 provided on the left head 29 is left inside the work 17. The core 69 is again moved to the center of gravity position (step S3), and the pressurized fluid injection device 75 again injects a pressurized fluid such as air or a processing fluid from the machining fluid injection nozzle 67 toward the core 69 ( In step S4), the core 69 is blown away from the work 17 and removed (step S8). Further, the machining fluid is not discharged from the machining tank 31, and the pressurized fluid ejecting device 75 ejects air, machining fluid or the like from the machining fluid ejecting nozzle 67 toward the core 69 left in the work 17 in the machining fluid. Jetting pressurized fluid,
It is also possible to remove the core 69 by blowing it out of the work 17.

Referring to FIGS. 1 and 2, the work 1
A method of detecting contact between the core 69 remaining in the inside 7 and the contact detecting plates 71 provided on the heads 27 and 29 will be described. The contact sensing plates 71 are respectively provided from the positions of the heads 27 and 29 facing the work 17 to the front surface, and when the cores 69 left in the work 17 come into contact with each other, conduction is generated between them. ing. 77,7
Reference numeral 9 denotes pulse transformers PTr1 and PTr2, which are respectively connected in series to a detection circuit that connects the work 17 and the contact sensing plate 71. The detection pulse generation circuit 81 is connected to the pulse transformer 77, and is further connected to the NC / power supply control device 37 and the comparison / determination circuit 85. The pulse transformer 79 is coupled to the contact detection circuit 83, and further connected to the NC / power supply control device 37 via the comparison / determination circuit 85.

In the circuit described above, the NC / power supply controller 37 turns on the detection pulse generation circuit 81 at the same time as the end of the electric discharge machining. As a result, an AC pulse is generated in the detection circuit via the pulse transformer 77. The core processing 69 is performed as described above, and the core 69 left in the work 17 is removed.
And the contact sensing plates 71 provided on the heads 27 and 29 are not in contact with each other, that is, from the inside of the work 17 to the core 69.
Is correctly removed, no current flows through the detection circuit, and thus no current flows through the pulse transformer 79. When the core 69 left in the work 17 is not properly removed and contacts the contact sensing plate 71 provided on each of the heads 27 and 29, a current flows in the detection circuit and the contact is detected via the pulse transformer 79. The detection signal is input to the circuit 83. The detected signal determines whether or not the contact is sensed by the detection pulse output by the comparison / determination circuit 85, and the core 69 left in the work 17 and the head 27,
The signal that detects the contact with the contact sensing plate 71 provided on each of the 29 is sent to the NC / power supply control device 37. The NC / power supply control device 37 again moves the heads 27 and 29 and the work 17 relative to each other in response to the input detection signal, and sets the center position of the machining liquid jet nozzle 67 provided on the left head 29 to the work. The core 69 is moved to the position of the center of gravity of the core 69 remaining in the inside 17, and a pressurized fluid such as air or a working liquid is ejected from the pressurized fluid ejecting device 75 toward the core 69. Command to blow away. Further, if the core treatment is performed by injecting a pressurized fluid such as air or a processing liquid toward the core 69 left in the work 17 in the processing liquid, the core 69 is removed when the core 69 is removed. It is possible to prevent scattering of the child 69 and scattering of a pressurized fluid such as air or processing liquid jetted toward the core 69.

[0021]

As is apparent from the above description, according to the present invention, in a wire electric discharge machine for performing electric discharge machining by moving a wire electrode in a lateral direction and relatively moving the wire electrode and a workpiece. It is easy to eject the pressurized fluid such as air and machining liquid laterally toward the core remaining in the later work, and to provide the pressurized fluid ejecting means for removing the core from the inside of the work. With such a structure, the core in the work can be reliably removed. Further, if the pressurized fluid ejecting means is provided on both sides of the work to guide the wire electrodes so as to travel and is provided on at least one head of a pair of heads that move relative to the work, the head is provided. By relatively moving the work and the work, the pressurized fluid ejecting means and the core left in the work can be easily positioned. Further, if the center of gravity position of the core remaining in the work is calculated by the center of gravity position calculating means and the calculated center of gravity position and the center position of the pressurized fluid ejecting means are made to coincide with each other, the pressurized fluid ejecting means The pressure of a pressurized fluid such as air or machining fluid ejected from the core can be reliably applied to the core. Further, when the work is moved to a position where the wire electrode is loaded in the work starting hole of the work when continuing the work or performing a new work, the core left in the work by the contact sensing means When the contact with any one of the pair of heads is sensed, the center of gravity of the core and the center position of the pressurized fluid ejecting means are re-aligned with each other so that the pressurized fluid ejecting means leaves the workpiece in the work. By injecting a pressurized fluid such as air or machining fluid laterally again toward the removed core, it is possible to determine whether the core has been reliably removed from the inside of the work, and the core is used for the work. It is also possible to prevent the head from falling and damaging the head.

[Brief description of drawings]

FIG. 1 is an enlarged plan view and a configuration block diagram showing a head portion of a wire electric discharge machine including a core processing device according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing a head portion of a wire electric discharge machine including a core processing device according to an embodiment of the present invention.

FIG. 3 is a front view of the wire electric discharge machine according to the embodiment of the present invention.

FIG. 4 is a side view of the wire electric discharge machine according to the embodiment of the present invention.

FIG. 5 is a plan view of the wire electric discharge machine according to the embodiment of the present invention.

FIG. 6 shows a flowchart of core processing of the wire electric discharge machine of the present invention.

[Explanation of symbols]

1 wire electrode 17 work 27 right head 29 Left head 37 NC / Power control device 67 Working fluid injection nozzle 69 core 71 Touch sensing plate 73 Center of gravity position calculator 75 Pressurized fluid ejection device 77, 79 pulse transformer 81 Detection pulse generation circuit 83 Contact detection circuit 85 Comparison judgment circuit

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-3-270822 (JP, A) JP-A-62-264825 (JP, A) JP-A-4-63629 (JP, A) JP-A-57- 127626 (JP, A) Actual flat 4-67932 (JP, U) Actual flat 4-57322 (JP, U) Actual flat 4-67933 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B23H 7/02

Claims (3)

(57) [Claims] 1. A wire electric discharge machine for performing electric discharge machining by moving a wire electrode and a work piece relative to each other while laterally moving the wire electrode, which is provided on both sides of the work piece and can run the wire electrode. Is provided on at least one of a pair of heads that move relative to the work while guiding the
Wire electrical discharge machining characterized in that it is equipped with a pressurized fluid ejecting means for ejecting a pressurized fluid laterally toward the core remaining in the work after recovery to remove the core from the work. Machine core processing equipment. 2. The method according to claim 1, further comprising: a center-of-gravity position calculating means of the core left in the work; and a positioning command means for making the calculated center-of-gravity position coincide with the center position of the pressurized fluid ejecting means. The core processing device of the wire electric discharge machine described. 3. A contact sensing means for sensing a contact between the core left in the work and any one of the pair of heads, and a core left in the work by the contact sensing means. wherein After sensing the contact with any of the heads of the pair of heads, retry command means for injecting again a pressurized fluid in the lateral direction toward the core which is remaining in the work from the pressurized fluid injection means Claim 1 or 2 provided with
The core processing device of the wire electric discharge machine according to.