JP2001334416A - Electric discharge machining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric discharge machining device to prevent lowering of machining speed and lowering of positional precision due to heating by making a feeding route shortest, increasing a contact area of the feeding route and making it certainly contact with it on an article to be machined or on an electrode replacement device. SOLUTION: An electric feeding auxiliary member is provided between a fixing jig and a fixing fitting to hold the article to be machined or the electrode, an electric feeding member having spring work and a feeder for electric feeding are fixed on the electric feeding auxiliary member, and electric feeding is carried out by constituting it so that the electric feeding member and the fixing fitting make contact with each other at the time of installing the fixing fitting on the fixing jig.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric discharge machining apparatus provided with a power supply device for supplying electric discharge energy to an exchange apparatus for performing electric discharge machining while exchanging electrodes or workpieces.

[0002]

2. Description of the Related Art FIGS. 9 and 10 show a conventional electric discharge machine, FIG. 9 is an overall view thereof, and FIG. 10 is a sectional view showing details of an exchange device. In FIG. 9, reference numeral 31 denotes a die-sinking electric discharge machine, and reference numeral 41 denotes a stocker. 32 is a head, 33
Is a processing tank, 34 is a surface plate, and 35 is an electrode attached to the head 32. 42 is an arm and 43 is a hand provided at the tip of the arm 42. The exchange device shown in FIG. In FIG. 10, reference numeral 1 denotes a fixing jig which is fixed on the surface plate. 2 is shank,
Reference numeral 3 denotes a fixture, which is manufactured integrally or is fixed with a mechanical element such as a screw. 4 is presser foot, 5
Is a work, and 6 is a screw, which holds the work 5 by sandwiching the work 5 with the fixture 3. Replacement set 1 for shank 2, fixing bracket 3, presser foot 4, workpiece 5, and screw 6.
As 00, usually, a plurality of parts are prepared in the stocker 41. Reference numeral 10 denotes a feeder for supplying discharge energy to the workpiece 5 and is fixed to the fixing jig 1 by fixing screws 11. The clearance between the insertion hole for the shank 2 provided in the fixing jig 1 and the outer diameter of the shank 2 is sufficiently large so that the insertion of the shank 2 by the arm 42 can be easily performed. 1a is a positioning pin provided on the fixing jig 1, and 2a is a positioning pin provided on the fixing jig 3, which is provided at each of four positions. When clamping, 1a
The workpiece 5 is accurately positioned with respect to the fixing jig 1 by the engagement of the positioning pins 2a and 2a. Reference numeral 1b denotes a ball provided on the fixing bracket 1 for fixing the shank 2, and performs a linear motion (A direction) by a driving device (not shown). Reference numeral 2b denotes a tapered clamp groove provided on the shank 2 by linear movement of the ball 1b.
Is fixed to the fixing jig 1 side (direction B) with a predetermined force.

[0005] Next, an operation until the work 5 is processed will be described. One exchange set 100 stored in the stocker 41 side is taken out by the hand 43, and is fixed on the surface plate 34 in the processing tank 33 by the movement of the arm 42 (X1, Y1, Z1 directions). The first shank 2 is transported to a predetermined position. Next, exchange set 10
In order to fix 0 to the fixing jig 1, the ball 1b generates a linear motion (A direction) by a driving device (not shown) and is pressed against the tapered surface of the tapered groove 2b. As a result, the replacement set 100 is pulled toward the fixing jig 1 (in the direction B), and the positioning pins 1a and 2a come into contact with each other.
It is clamped by a predetermined tensile force and stops. Next, in order to perform electric discharge machining, the arm 42 is retracted to the stocker 41 side, and the head 32 is moved to a predetermined position with respect to the workpiece 5 (X and Y directions). Next, the electrode 35 attached to the head 32 is moved (Z direction), and electric discharge machining is performed while maintaining a predetermined distance from the workpiece 5. In such a conventional exchange device, power is supplied from the electric discharge machining power supply (not shown) to the workpiece 5 through the feeder 10, the fixing jig 1, the ball 1b, the clamp groove 2b, the shank 2, and the fixing metal 3. Done via Some of them are feeder 10, fixing jig 1,
This is performed via the positioning pin 1a, the positioning pin 2a, and the fixture 3.

[0004]

In the above-described conventional electric discharge machine, power is supplied to the workpiece 5 by the feeder 1.
0, fixing jig 1, ball 1b, clamp groove 2b, shank 2, fixing jig 3, or feeder 10, fixing jig 1, positioning pin 1a, positioning pin 2a, fixing jig 3 Done via In the power supply path,
When the contact state is a point contact with the ball 1b or a very small contact area such as the positioning pins 1a and 2a, a high frequency current for electric discharge machining generally flows on the surface of the conductor, so that a sufficient discharge energy can be obtained. It could not be supplied and the processing speed was reduced. For this reason, in the conventional apparatus, the position of the feeder 10 is directly attached to the workpiece 5,
As described in Japanese Patent Application Laid-Open No. 6-56348, a method has been used in which a workpiece is fixed on a surface plate or the like, and then a feeder is attached to a metal fitting for fixing the workpiece.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and aims at improving the processing speed by supplying the discharge energy from a feeder to an electrode or a workpiece in the shortest time. It is intended to eliminate the need to change the feeder when replacing the workpiece.

[0006]

In the electric discharge machining apparatus according to the present invention, a spring-like power supply member is provided between a fixing jig and a fixing metal for holding a workpiece or an electrode.

Further, a spring-like power supply member and a power supply auxiliary member for mounting a feeder are provided between the fixing jig and a fixing metal for holding a workpiece or an electrode.

Further, in order to enable contact at a plurality of points, a spring-like power supply member is provided with a slit so as to make contact at a plurality of points.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIGS. 1 and 2 show an exchange device on the workpiece side of a die-sinking electric discharge machine according to a first embodiment of the present invention, wherein 1 is a fixing jig, 2 is a shank, and 3 is a fixing bracket. 4 is a presser foot, 5 is a workpiece, and 6 is a screw. Except for the fact that the shank 2 and the fixture 3 are composed of separate components and are fixed, they are the same as in the prior art, and therefore detailed description is omitted. Reference numeral 7 denotes a power supply auxiliary member which is fixed to both sides of the fixing jig 1.
The material is preferably a material having good conductivity such as copper or aluminum, but a general steel material can also be used. Reference numeral 8 denotes a power supply member, which is formed by bending a thin plate as shown in FIG.
Two screws are fixed to each of the power supply auxiliary members 7 by the screws 9. The power supply member 8 has a mounting hole 8a for fixing.
Are provided, and the slits 8b are provided at predetermined intervals. As a material, a copper alloy spring material having good conductivity such as beryllium copper and phosphor bronze is suitable. The mounting position of the power supply member 8 is set such that when the replacement set 100 is clamped, the power supply member 8 is elastically deformed by a predetermined amount after the contact with the contact surface of the fixture 3. The number of power supply members 8 used is determined by electric discharge machining conditions such as high-frequency current and large current. 10
Is a feeder for supplying discharge energy to the workpiece 5, and 11 is a fixing screw thereof, which is the same as the conventional one, but is configured such that a plurality of feeders 10 can be connected to the power supply auxiliary member 7. Is different from the conventional one. 1a is a fixing jig 1
2a are positioning pins provided on the fixture 3, 1b is a ball provided on the fixture 1 for fixing the shank 2, and 2b is a tapered clamp groove provided on the shank 2. Since these have the same configuration as that described in the conventional device, detailed description will be omitted.

Next, an operation until the work 5 is processed will be described. As in the case of the conventional device shown in FIG.
0 is taken out by the arm 42 and the hand 43 and is transported to a predetermined position of the shank 2 of the fixing jig 1 installed on the surface plate 34 in the processing tank 33. At this time, the power supply member 8 is elastically deformed by a predetermined amount, and is in contact with the contact surface of the fixture 3. Next, in order to fix the replacement set 100 to the fixing jig 1, the ball 1b generates a linear motion (A direction) by a driving device (not shown) and is pressed against the tapered surface of the clamp groove 2b. Thus, the replacement set 10
No. 0 is pulled toward the fixing jig 1 (direction B), the positioning pin 1a and the positioning pin 2a come into contact with each other, are clamped by a predetermined tensile force, and stop. Next, in order to perform electric discharge machining, the hand 43 holding the exchange set 100 is released, the arm 42 is retracted to the stocker 41 side, and the head 32 is moved to a predetermined position with respect to the workpiece 5 (X · Y
Direction). Next, the electrode 35 attached to the head 32 is moved (Z direction), and electric discharge machining is performed while maintaining a predetermined distance from the workpiece 5. Since power is supplied to the workpiece 5 through the feeder 10, the power supply auxiliary member 7, the power supply member 8, and the fixing fitting 3, the contact surface between the ball 1b and the clamp groove 2b and the positioning pin Power is not supplied through the contact surface between the positioning pin 1a and the positioning pin 2a. Further, since the power supply member 8 is provided with the slit 8b,
Even if the contact surface between the power supply member 8 and the fixture 3 is inclined or has irregularities, it can be contacted at a plurality of points, and reliable power supply can be performed.

The slit 8b of the power supply member 8 can be omitted when the electric current for electric discharge machining is small.

Embodiment 2 FIG. FIGS. 4, 5, and 6 show a workpiece replacement device for a wire electric discharge machine according to a second embodiment of the present invention, in which a replacement set is placed from above. In the drawing, a fixing jig 1, a shank 2, a power supply auxiliary member 7, a power supply member 8, a screw 9, a feeder 10, a fixing screw 11, a positioning pin 1a, a positioning pin 2a, a ball 1b, and a clamp groove 2b are described in Embodiment 1.
Therefore, the description is omitted. Reference numeral 21 denotes a mounting bracket for supporting the workpiece 5, which has a hole through which a wire passes in a central portion for wire electric discharge machining. Reference numeral 22 denotes a fixture, to which the shank 2 is fixed, and attached to both sides of the attachment 21.
Reference numeral 23 denotes a screw for fixing the mounting member 21 and the fixing member 22. 24 is a surface plate of the wire electric discharge machine, and the fixing jig 1 is fixed to two places on the upper surface thereof. The number and positions of the fixing jigs 1 to be used are selected according to the size of the workpiece 5. Two power supply members 8 are used on both sides of the fixing bracket 22, and four power supply members 8 are used in total.

In the second embodiment, similarly to the first embodiment, the exchange set 100 is exchanged by the arm 42 and the hand 43. The replacement set 10 having a large weight or size
When replacing 0, the operator cannot lift and place it because it cannot be handled by the arm 42 or the hand 43.
You may make it mount | wear using auxiliary tools, such as a crane and a lift. The clamp operation is the same as in the first embodiment, and a description thereof will be omitted.

Embodiment 3 In the first and second embodiments, the case where the workpiece 5 is replaced has been described. However, as shown in FIG. 7, the one holding the electrode 35 is stored in the stocker 41 as the replacement set 100 and fixed. The jig 1 is attached to the main shaft of the head 32, and the exchange set 100 is attached to the fixing jig 1 so as to be exchangeable.
It can also be applied to exchanges.

Embodiment 4 FIG. 8 is a cross-sectional view of a power supply portion of the switching device according to the fourth embodiment. Embodiment 1
As compared with the first to third embodiments, the power supply assisting member 7 is omitted, the two power supply members 8 are overlapped and fixed to the fixing jig 1 with the fixing screw 11, and the feeder 10 is also fixed together. Things. The number of the power supply members 8 may be increased or decreased depending on the electric current of the electric discharge machining. Embodiment 1
Similarly to the above, the power supply member 8 may be provided with a slit 8b so as to contact and supply power at a plurality of points.

Further, the shape of the workpiece 5 or the electrode 35 may be formed so that the workpiece 5 or the electrode 35 and the power supply member 8 are in direct contact with each other, or the shape of the power supply member 8 may be formed. Then, it can be configured to supply power.

[0017]

Since the present invention is configured as described above, it has the following effects.
Since the spring-like power supply member and the power supply auxiliary member for mounting the feeder are provided between the fixing jig and the fixing metal holding the workpiece or the electrode, the contact area of the power supply path increases,
In addition, power can be supplied to the electrode or the workpiece in the shortest time. As a result, a reduction in the processing speed can be prevented, and it is not necessary to replace the feeder.

Further, if the power supply member is fixed to the fixing jig and the feeder is also fixed so as to contact the fixing bracket to supply power, the power supply auxiliary member can be further omitted, and the cost can be reduced. effective.

Further, since the spring-like power supply member is provided with a slit so as to be capable of contacting at a plurality of points, even if the contact surface between the power supply member and the fixing bracket is inclined or uneven, it is reliable. Power can be supplied.

[Brief description of the drawings]

FIG. 1 is a perspective view of an exchange device according to a first embodiment of the present invention.

FIG. 2 is a plan view of the exchange device according to the first embodiment of the present invention.

FIG. 3 is a side view and a plan view of a power supply member of the exchange device according to the first embodiment of the present invention.

FIG. 4 is a plan view of a switching device according to a second embodiment of the present invention.

FIG. 5 is a front sectional view of an exchange device according to a second embodiment of the present invention.

FIG. 6 is a side cross-sectional view of a switching device according to a second embodiment of the present invention.

FIG. 7 is an external view of a replacement set according to Embodiment 3 of the present invention.

FIG. 8 is a partial cross-sectional view of an exchange according to a fourth embodiment of the present invention.

FIG. 9 is a front view showing the configuration of a conventional electric discharge machine.

FIG. 10 is a plan sectional view showing a conventional exchange device.

[Description of Signs] 1 fixing jig, 2 shank, 3 fixing bracket, 4 presser foot, 7 power feeding auxiliary member, 8 power feeding member, 10 feeder

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Jun Taneda 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 3C059 AA01 BA26 JA18

Claims (5)

[Claims] 1. An electric discharge machining apparatus for supplying discharge energy to a machining gap formed between an electrode and a workpiece to generate an electrical discharge intermittently to process the workpiece. A fixing jig fixed to the table side, a fixing metal holding the workpiece, and being exchangeably fixed to the fixing jig; a fixing jig fixed to the fixing jig and a spring action Has,
A power supply member for contacting and supplying power to the fixing bracket; and a power supply feeder connected to the power supply member. When the fixing bracket is mounted on the fixing jig, the power supply feeder, the power supply member, and the fixing An electric discharge machining apparatus characterized in that discharge energy is supplied to the workpiece through a metal fitting. 2. A discharge machining apparatus for supplying discharge energy to a machining gap formed between an electrode and a workpiece to generate an intermittent discharge and process the workpiece. A fixing jig fixed to the main shaft side of the fixing jig; a fixing jig holding the electrode and being exchangeably fixed to the fixing jig; a fixing jig fixed to the fixing jig and having a spring action. And
A power supply member for contacting and supplying power to the fixing bracket; and a power supply feeder connected to the power supply member. When the fixing bracket is mounted on the fixing jig, the power supply feeder, the power supply member, and the fixing An electric discharge machining apparatus characterized in that electric discharge energy is supplied to the electrode through a metal fitting. 3. An electric discharge machining apparatus for supplying discharge energy to a machining gap formed between an electrode and a workpiece to generate an intermittent discharge to process the workpiece. A fixing jig fixed to the table side of the table, a fixing jig holding the work piece and being exchangeably fixed to the fixing jig, and a fixing jig between the fixing jig and the fixing jig. A power supply member that is provided and has a spring action and contacts and supplies power to the fixing bracket; a power supply auxiliary member fixed to the fixing jig and fixing the power supply member; and a power supply auxiliary member connected to the power supply auxiliary member. A power supply feeder, and when the fixing bracket is mounted on the fixing jig, discharge energy is supplied to the workpiece through the power supply feeder, the power supply auxiliary member, the power supply member, and the fixing bracket. Structure An electric discharge machine characterized by having been completed. 4. An electric discharge machining apparatus for supplying discharge energy to a machining gap formed between an electrode and a workpiece to generate an electrical discharge intermittently to process the workpiece. A fixing jig fixed to the main spindle side of the above, and while holding the electrode, with respect to the fixing jig,
A fixing metal fixed to be exchangeable, a power supply member provided between the fixing jig and the fixing metal, having a spring action, and supplying power by contacting with the fixing metal; A power supply auxiliary member fixed to fix the power supply member; and a power supply feeder connected to the power supply auxiliary member, wherein the power supply feeder and the power supply auxiliary member are provided when the fixing bracket is mounted on the fixing jig. An electric discharge machining apparatus configured to supply discharge energy to the electrode through the power supply member and the fixture. 5. The electric discharge machining apparatus according to claim 1, wherein the power supply member has a plurality of slits and is configured to supply power from a plurality of contact positions.