JP3050773B2 - Electrode and electrode guide replacement method for small hole electric discharge machine, exchange device, electrode holder, and small hole electric discharge machine used in the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exchange method for attaching and detaching electrodes and electrode guides to and from a small hole electric discharge machine for electric discharge machining of a small hole in a work, and an exchange device used in the method.
The present invention relates to a small hole electric discharge machine and an electrode holder.

[0002]

2. Description of the Related Art As a prior example relating to the present invention, there is, for example, JP-A-3-287318. The configuration of this prior example is such that a disk-shaped chuck pallet is rotatably provided on a frame provided so as to be reciprocally movable in a direction approaching and moving away from a main shaft in an electric discharge machine, and the vicinity of an outer peripheral edge of the chuck pallet is provided. The chuck portion attached to the upper end of the pipe electrode is detachably supported in the horizontal direction in a large number of support holes provided in the above.

[0003]

In the conventional structure as described above, the chuck pallet is turned to index a desired pipe electrode to a replacement position, and then the chuck pallet is moved to the position of the spindle in the electric discharge machine. After moving, the pallet for chuck is raised, and the pipe electrode indexed to the replacement position is inserted into the pipe electrode holder of the spindle, thereby mounting a new pipe electrode on the spindle. .

That is, in the prior art, since the chuck pallet itself supporting a large number of pipe electrodes is moved to a position below the main shaft of the electric discharge machine and positioned, for example, a large space is required below the main shaft. There are various problems to be solved.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and the present invention is directed to a method for exchanging an electrode in a small-hole electric discharge machine, the method comprising: Step (a) of positioning the processing head of the processing machine to the electrode replacement position, step (b) of indexing a desired electrode held in the electrode stocker to the electrode exchange position, and step (a) of the electrode indexed to the electrode exchange position. (C) transferring horizontally and linearly to a position below the main shaft provided on the processing head by a pair of holding claws provided reciprocally in the electrode holder transfer device, and positioning the main shaft; The chuck provided on the main spindle holds an electrode holder previously attached to the upper end of the electrode, and prevents the machining fluid supplied to the electric discharge machining section via the chuck and the electrode from leaking. A biasing to allowed to contact the upper end of the electrode holder to the seal ring with the lower end of the interior and sealing member in step (d) and become more electrode replacing downward direction.

According to a second aspect of the present invention, there is provided a method for replacing an electrode guide in a small-hole electric discharge machine, wherein an electrode guide stocker holding a plurality of electrode guides to be attached to and detached from a machining head in the small-hole electric discharge machine is provided. (A) positioning the electrode guide at the electrode guide attachment / detachment replacement position, and (b) positioning the processing head at a position above a desired electrode guide held by the electrode guide stocker positioned at the electrode attachment / detachment replacement position. (C) engaging the desired electrode guide with the electrode guide mounting portion provided on the processing head, and fixing the electrode guide by a lock device provided on the electrode guide mounting portion (d). Process and
The electrode guide replacement method comprises:

According to a third aspect of the present invention, a plurality of holder supporting members for removably supporting an electrode holder mounted on an upper end portion of an electrode in a horizontal direction are provided on an endless chain provided so as to be able to travel horizontally. An electrode holder transfer device capable of holding the electrode holder supported by the holder support member indexed to the position and transferring the electrode holder to the electrode exchange position of the small hole electric discharge machine is provided horizontally below the endless chain. This is an electrode exchange device.

According to a fourth aspect of the present invention, there is provided an electrode exchanging apparatus according to the third aspect, wherein the holder support member includes a magnet (permanent magnet) for fixing and holding the electrode holder.

The invention according to claim 5 is the invention according to claim 3 or 4.
In the invention described in (1), an electrode guide stocker holding a plurality of electrode guides that are detachably mounted on a machining head in a small hole electric discharge machine is movably provided to an electrode guide exchange position of the small hole electric discharge machine. Configuration.

According to a sixth aspect of the present invention, in the fifth aspect of the invention, the electrode guide stocker includes a magnet for fixing and holding the electrode guide.

According to a seventh aspect of the present invention, a processing head is provided on a slider which is provided at a position above the work table so as to be movable and positionable in the front-rear and left-right directions, and the upper end of the electrode is attached to the processing head. A main shaft provided with a chuck for holding is provided so as to be vertically movable, and in a small hole electric discharge machine having an electrode guide device for guiding the electrode at a position below the main shaft, the chuck is provided at an upper end of the electrode. The attached electrode holder is detachable and replaceable.
And, in order to prevent the leakage of the working fluid flowing from the chuck to the electrode via the electrode holder, the seal member provided at the lower end thereof with a seal ring in close contact with the upper end of the electrode holder is urged downward, and This is a small-hole electric discharge machine with a configuration built in the main shaft.

According to an eighth aspect of the present invention, in the seventh aspect of the present invention, the electrode guide device includes a tapered hole for guiding the lower end of the electrode as a center, and a V provided below the tapered hole. An electrode guide for guiding the electrode to the V-shaped groove of the block is provided so as to be press-fixable and detachable and replaceable.

According to a ninth aspect of the present invention, a processing head is provided on a slider which can be moved and positioned in the front-rear and left-right directions at a position above a worktable so as to be adjustable in a vertical position, and the upper end of an electrode is provided on the processing head. In a small-hole electric discharge machine having a configuration in which a spindle having a chuck for holding is provided so as to be vertically movable and an electrode guide device for guiding the electrode at a position below the spindle, the electrode guide device is provided at a lower end of the electrode. A small hole provided with a tapered hole for guiding the center of the portion, and an electrode guide for guiding the electrode to a V-shaped groove of a V block provided below the tapered hole so that the electrode guide can be pressed and fixed and can be detachably replaced. It is an electric discharge machine.

The invention according to claim 10 is the invention according to claims 7 and 8.
Or the invention described in 9 above, wherein an electrode vibration preventing device comprising a vibration preventing member provided with a V-shaped groove for restricting the electrodes from the horizontal direction to prevent the electrodes from running when mounting the electrodes on the chuck of the spindle. It is a small hole electric discharge machine equipped with.

According to an eleventh aspect of the present invention, in the invention according to the tenth aspect, the electrode shake preventing device includes a V-shaped shake preventing member that engages and supports the electrode from the horizontal direction.
This is a small-hole electric discharge machine in which the shake preventing member is provided integrally movable with the main shaft so as to be vertically movable and fixedly stopped at a predetermined position.

According to a twelfth aspect of the present invention, in the invention of the eleventh aspect, a magnet is provided on one of the spindle head side and the anti-vibration member so as to integrate both of them, and the anti-vibration member or the fixed portion is provided. Is provided with a magnet for fixing and stopping the shake preventing member at a predetermined position.

According to a thirteenth aspect of the present invention, a collet is inserted into a cylindrical outer cylinder detachably mountable on a chuck provided on a main shaft of a small-hole electric discharge machine by using an electrode holder mounted on an upper end portion of an electrode. A hole is provided, and a collet capable of holding and fixing the electrode is provided by being inserted into the collet insertion hole, a sealing elastic member is provided between the upper surface of the collet and the collet insertion hole, and formed below the collet. An electrode holder in which a screw member capable of tightening the tapered portion is adjustably screwed to the outer cylinder.

According to a fourteenth aspect of the present invention, in the thirteenth aspect of the present invention, the sealing elastic member is configured to simultaneously seal between the collet fitting hole and the collet and between the collet and the electrode. It is.

[0019]

According to the first aspect of the present invention, there is provided an electrode replacement method in a small-hole electric discharge machine, a step (a) of positioning a machining head in the small-hole electric discharge machine to an electrode exchange position, and a method of holding the machining head in an electrode stocker. (B) indexing the desired electrode to the electrode exchange position, and providing the electrode indexed to the electrode exchange position on the machining head by a pair of holding claws reciprocally provided in the electrode holder transfer device. (C) transferring horizontally and linearly to a position below the main spindle and positioning it;
By lowering the main shaft, the chuck provided on the main shaft holds the electrode holder previously attached to the upper end of the electrode, and also prevents leakage of the machining fluid supplied to the electric discharge machining unit via the chuck and the electrode. And (d) bringing the upper end of the electrode holder into close contact with the seal ring provided at the lower end of the seal member which is urged downward to the main shaft.

With the above configuration, the machining head in the small hole electric discharge machine is positioned at the electrode replacement position, and a desired electrode held by the electrode stocker is indexed to the electrode replacement position. The work is horizontally and linearly transferred to a position below the main shaft of the processing head by the holding claws provided in the above, and then the main shaft is lowered, and the electrode holder attached to the upper end portion of the electrode by the chuck provided on the main shaft. When held, the upper end of the electrode holder is brought into close contact with the seal ring provided at the lower end of the seal member that is urged downward to the main shaft and provided therein, thereby preventing leakage of the working fluid.

According to a second aspect of the present invention, there is provided an electrode guide replacement method in a small-hole electric discharge machine, wherein an electrode guide stocker holding a plurality of electrode guides to be attached to and detached from a machining head in the small-hole electric discharge machine is provided. (A) positioning the electrode guide at the electrode guide attachment / detachment replacement position, and (b) positioning the processing head at a position above a desired electrode guide held by the electrode guide stocker positioned at the electrode attachment / detachment replacement position. (C) engaging the desired electrode guide with the electrode guide mounting portion provided on the processing head, and fixing the electrode guide by a lock device provided on the electrode guide mounting portion (d). Process.

With the above arrangement, the electrode guide stocker holding the plurality of electrode guides is positioned at the electrode guide replacement position, and after the processing head is positioned above the desired electrode guide on the electrode guide stocker, the processing head is positioned. Then, after the electrode guide is mounted on the electrode guide mounting portion, the electrode guide can be securely mounted on the electrode guide mounting portion by operating the lock device.

According to a third aspect of the present invention, a plurality of holder supporting members for removably supporting an electrode holder attached to an upper end portion of an electrode in a horizontal direction are provided on an endless chain provided so as to be able to travel horizontally. An electrode holder transfer device capable of holding the electrode holder supported by the holder support member indexed to the position and transferring the electrode holder to the electrode exchange position of the small hole electric discharge machine is provided horizontally below the endless chain. It is.

Therefore, the electrode holder supported by the holder supporting member indexed and positioned at a predetermined position can be horizontally transferred to the electrode replacement position of the small hole electric discharge machine by the electrode holder transfer device, and the small hole electric discharge machine Can be attached to

According to the fourth aspect of the present invention, since the holder supporting member is provided with a magnet (permanent magnet) for fixing and holding the electrode holder, the electrode holder can be easily attached to and detached from the holder supporting member. While being able to
The electrode holder can be reliably fixed to the holder supporting member.

According to a fifth aspect of the present invention, an electrode guide stocker holding a plurality of electrode guides to be attached to and detached from a machining head in a small hole electric discharge machine is moved to an electrode guide exchange position of the small hole electric discharge machine. Since it is provided movably, the electrode guide can be exchanged according to the diameter of the electrode mounted on the small hole electric discharge machine, and it is possible to correspond to electrodes of various diameters.

According to the sixth aspect of the present invention, since the electrode guide stocker is provided with the magnet for fixing and holding the electrode guide, the electrode guide can be easily attached to and detached from the electrode guide stocker. The electrode guide can be securely fixed to the guide stocker.

According to a seventh aspect of the present invention, a processing head is provided on a slider which is provided at a position above the work table so as to be movable and positionable in the front-rear and left-right directions, and the upper end of the electrode is attached to the processing head. A main shaft provided with a chuck for holding is provided so as to be vertically movable, and in a small hole electric discharge machine having an electrode guide device for guiding the electrode at a position below the main shaft, the chuck is provided at an upper end of the electrode. The attached electrode holder is detachable and replaceable.
And, in order to prevent the leakage of the working fluid flowing from the chuck to the electrode via the electrode holder, the seal member provided at the lower end thereof with a seal ring in close contact with the upper end of the electrode holder is urged downward, and Since the spindle is built in, the leakage of the working fluid is ensured each time the electrode is replaced.

In the invention according to claim 8, the electrode guide device is provided with a tapered hole for guiding around the lower end of the electrode, and the electrode guide device is inserted into a V-shaped groove of a V block provided below the tapered hole. The electrode guide that guides the electrode is press-fixed and detachably replaceable, so that the electrode guide can be replaced in response to changes in the diameter of the electrode, and the electrode guide can be replaced even after the electrode guide is replaced. The electrodes can be guided to the electrodes reliably.

According to a ninth aspect of the present invention, a processing head is provided on a slider provided so as to be movable and positionable in the front-rear and left-right directions at a position above a work table so that a vertical position can be adjusted. In a small-hole electric discharge machine having a configuration in which a spindle having a chuck for holding is provided so as to be vertically movable and an electrode guide device for guiding the electrode at a position below the spindle, the electrode guide device is provided at a lower end of the electrode. A tapered hole that guides around the portion, and an electrode guide that guides the electrode to the V-shaped groove of the V block provided below the tapered hole is press-fixable and detachably replaceable. In addition, the electrode can be reliably guided to the electrode guide that has been detached and replaced, and the electrode can be guided by the electrode guide.

According to a tenth aspect of the present invention, there is provided an electrode provided with a vibration preventing member having a V-shaped groove for restricting the electrode in a horizontal direction and preventing the electrode from oscillating when the electrode is mounted on the chuck of the spindle. Since the apparatus is provided with the shake prevention device, the shake of the electrode can be effectively prevented.

According to an eleventh aspect of the present invention, in the electrode shake preventing device, a V-shaped shake preventing member for engaging and supporting the electrode from the horizontal direction is provided, and the shake preventing member is vertically integrated with the main shaft. Since it is movable and provided so as to be able to be fixed and stopped at a predetermined position, when the electrode is rotated at the time of electric discharge machining, it is possible to effectively prevent the deflection of the intermediate portion of the electrode, and the machining accuracy is further improved. .

According to a twelfth aspect of the present invention, a magnet for integrating both is provided on one of the spindle head side and the anti-vibration member, and the anti-vibration member is provided on one of the anti-vibration member and the fixed portion. Since it is provided with a magnet for fixing and stopping at the position, it is lowered integrally with the lowering of the spindle head side due to the consumption of the electrode, and rises integrally when the spindle head side is raised, and fixed at a predetermined position It is fixed to the part.

According to a thirteenth aspect of the present invention, a collet is fitted into a cylindrical outer cylinder detachably attached to a chuck provided on a main shaft of a small-hole electric discharge machine by using an electrode holder mounted on an upper end portion of an electrode. A hole is provided, and a collet capable of holding and fixing the electrode is provided by being inserted into the collet insertion hole, a sealing elastic member is provided between the upper surface of the collet and the collet insertion hole, and formed below the collet. Since the screw member capable of tightening the tapered portion is screwed to the outer cylinder in an adjustable manner, when the collet is tightened by the screw member, the electrode is clamped and fixed by the collet, and the sealing elastic member is formed. It is compressed to exhibit a sealing effect.

According to the fourteenth aspect of the present invention, the elastic member for sealing is configured to simultaneously seal between the collet insertion hole and the collet and between the collet and the electrode. And the collet can be easily sealed.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown conceptually in FIG. 1, a small-hole electric discharge machine 1 according to the present embodiment includes a work table 3 for supporting a work W. The slider 5 is provided so as to be movable and positionable in the front-rear and left-right directions.

A processing head 7 is mounted on the slider 5 so that the vertical position can be adjusted. A spindle head 9 is mounted on the processing head 7 so that the vertical position can be adjusted. The main spindle head 9 is provided with a main shaft 13 that can hold and fix the upper end of the pipe electrode 11 in a freely rotatable manner.

The lifting frame 1 in the processing head 7
An electrode guide device 15 for guiding and supporting the pipe electrode 11 is provided at a lower end portion of the pipe 4.

Although the schematic configuration as described above is a known configuration, and a configuration for operating each movable part is also known, a more detailed description will be made just in case. A ball screw mechanism (not shown) is operated by driving a servo motor M1 mounted on the carriage 17, so that the carriage 19 is moved and positioned in the left-right direction (X-axis direction).

The slider 5 is supported on the carriage 19 so as to be movable in the front-rear direction (Y-axis direction), and the slider 5 is moved and positioned in the front-rear direction by driving a servo motor M2 mounted on the carriage 19. It is configured as follows.

An elevating frame 14 of the processing head 7 is supported on the slider 5 so as to be vertically movable. The servomotor M3 mounted on the slider 5 drives the elevating frame 14 in the vertical direction (Z-axis direction). Is configured to perform the movement positioning.

The lifting frame 14 has a servo motor M
The spindle head 9 moves up and down along the elevating frame 14 by driving the servo motor M4. This spindle head 9
Is mounted with a motor M5 for rotating the main shaft 13.

Since the above-described schematic configuration is a known configuration as described above, the description of its operation will be omitted.

Referring to FIG. 2, a chuck for detachably holding an electrode holder 21 attached to the upper end of the pipe electrode 11 is provided at the lower end of the main shaft 13 in the small hole electric discharge machine according to the present embodiment. 23 is attached.

First, the structure of the electrode holder 21 will be described. The electrode holder 21 has a cylindrical outer cylinder 25. A through hole 25H through which a machining fluid can flow is provided at the axis of the outer cylinder 25, and a collet fitting hole 25C having a diameter larger than the through hole 25H is provided below the through hole 25H.

The upper end 25U of the outer cylinder 25 is formed with a small diameter, and a peripheral groove 25G for ball engagement is formed on the outer peripheral surface of the lower large diameter portion. Further, a flange 25F is formed at a position below the circumferential groove 25G, and a collet 2 fitted in the collet mounting hole 25C is formed on the lower peripheral surface.
Cap nut 29 as a screw member for fastening and fixing
Is detachably screwed.

The collet 27 is, as shown in FIG.
An insertion hole 27H through which the electrode 11 can be inserted is provided, and a slit 27S is formed in the body. In addition, a tapered surface 27T is formed on the outer peripheral surface of the lower end of the collet 27. Further, an elastic member 31 (see FIG. 2) for sealing, such as rubber, is attached to the upper surface of the collet 27.

It is desirable that the elastic member 31 be integrally attached to the upper surface of the collet 27 by, for example, bonding. However, a configuration in which the elastic member 31 is simply placed on the upper surface of the collet 27 is also possible.

The cap nut 29 is formed with a tapered engaging hole 29H capable of engaging with the tapered surface 27T of the collet 27.

With the above configuration, when the cap nut 29 is loosened, the electrode 11 is placed in the through hole 27H of the collet 27 so that the upper end of the electrode 11 slightly projects from the upper surface of the elastic member 31 for sealing. Insert from the side.

Thereafter, when the cap nut 29 is tightened, the engagement hole 29 of the cap nut 29 is formed in the tapered surface 27T of the collet 27.
H engages and presses the collet 27 upward in FIG. 2 and tightens the tapered surface 27T.

As described above, when the collet 27 is pressed upward against the outer cylinder 25, the upper surface of the elastic member 31 disposed on the upper surface of the collet 27 is pressed against the upper surface of the collet mounting hole 25C and gradually compressed. The electrode 11 will be gradually tightened.

Therefore, by the action of the elastic member 31, the collet 27, the collet mounting hole 25C, and the through hole 25
H and the seal between the collet 27 and the electrode 11 are simultaneously performed.

When the cap nut 29 tightens the tapered surface 27T of the collet 27, the electrode 11 is tightened by the collet 27 at the same time.

As understood from the above description, the electrode holder 21 can be attached to the upper end of the electrode 11 in advance.

The chuck 23 is configured as follows. That is, as shown in detail in FIG. 2, the main shaft 13 has a pipe shape, and a pipe-shaped sealing member 33 is fitted into the main shaft 13 so as to be vertically movable. The seal member 33 is constantly urged downward by a spring 35 provided inside the main shaft 13, and an O-ring 37 for sealing is provided on the outer peripheral surface of the seal member 33.

Further, a seal ring 39 made of rubber or the like is provided at the lower end of the seal member 33 so as to be in contact with the upper surface of the outer cylinder 25 of the electrode holder 21.

A cylindrical ball holder 41 is screwed and fixed to the outer periphery of the lower end of the main shaft 13, and a ball hole 41H in the radial direction is provided near the lower portion of the ball holder 41. In the ball hole 41H, a releasable ball 43 is fitted in a circumferential groove 25G of the outer cylinder 25 in the electrode holder 21.

On the outer periphery of the ball holder 41, a slide ring 45 capable of switching between a state in which the ball 43 is pressed inward and a state in which the ball 43 is released is vertically movably fitted. At positions vertically separated from each other, stoppers 47U and 47L for preventing the slide ring 45 from being detached are provided.

A circumferential groove 4 is formed on the peripheral surface of the slide ring 45.
5G is formed, and a shifter pin 51 provided on the shifter lever 49 is engaged with the circumferential groove 45G.

The shifter lever 49 is connected to the spindle head 9.
The shifter lever 49 is provided at the tip 9P of the shifter lever 49 at the tip of the shifter lever 49. Note that FIG.
In FIG. 7, the shifter lever 49, the shifter pin 51, and the like are modeled for easy understanding.

An actuator 55 such as, for example, a fluid pressure cylinder is mounted on the spindle head 9.
The leading end of the R and the base side of the shifter lever 49 are interlockingly connected.

In the above arrangement, when the slide ring 45 is raised by operating the actuator 55 and comes into contact with the upper stopper 47U, the slide ring 45
The large-diameter hole portion 45H formed on the inner peripheral surface at the lower end of the ball holder 41 is located at a position corresponding to the ball 43, and the plurality of balls 43 can be immersed from the inner peripheral surface of the mounting hole 41B in the ball holder 41.

When the outer cylinder 25 of the electrode holder 21 is fitted into the mounting hole 41B from below while the slide ring 45 is moved upward as described above, the upper end of the outer cylinder 25 becomes After entering the main shaft 13, the upper end surface of the outer cylinder 25 comes into close contact with a seal ring 39 provided on the seal member 33 to push up the seal member 33 against the spring 35.

Accordingly, a seal is provided between the outer cylinder 25 and the main shaft 13.

As described above, the outer cylinder 25 is inserted into the mounting hole 41B of the ball holder 41, and after the peripheral groove 25G formed on the peripheral surface of the outer cylinder 25 corresponds to the ball 43, the slide ring 45 is lowered. Then, the ball 43 is moved inward to engage with the circumferential groove 25G of the outer cylinder 25, and the electrode holder 2
The first outer cylinder 25 is fixed.

As understood from the above description,
By operating the actuator 55 to move the slide ring 45 up and down, the electrode holder 2 with respect to the chuck 23 is moved.
1 can be fixed and released, and the electrode holder 21 can be attached to and detached from the chuck 23.

As described above, after the electrode 11 is mounted on the spindle 13 of the spindle head 9, the spindle head 9 is lowered with respect to the lifting frame 14 of the processing head 7, and the workpiece W on the work table 3 is moved by the electrode 11. This is to perform fine hole electric discharge machining.

As described above, the electrode guide device 15 for guiding and supporting the electrode 11 when the workpiece W is subjected to the fine hole electrical discharge machining by lowering the spindle head 9 is constructed as follows.

That is, as shown in FIGS. 4 and 5, a bracket 57 is integrally attached to the lower end of the vertically movable frame 14 of the processing head 7 which is movable up and down. A guide piece 59 having a tapered hole 59T for guiding the lower end of the electrode 11 to the center is attached.

A V-block 61 having a V-shaped groove 61G is integrally attached to the lower surface of the tip of the bracket 57, and a holder block 63 is integrally opposed to the V-block 61. It is attached to the target.

The holder block 63 is a V block 61
The surface facing the V-shaped groove 61G is formed in a concave arc portion 63C having a diameter slightly larger than the outer dimensions of the electrode guide 65 to be detached and replaced.

Further, the holder block 63 has an actuator 67 such as a small cylinder for pressing and fixing the electrode guide 65 in the groove 61G of the V block 61.
Is installed. The lock member 69 that is reciprocated by the drive of the actuator 67 is provided so as to be able to protrude and retract from the concave arc portion 63C of the holder block 63.

Accordingly, the V-shaped groove 61G of the V block 61 and the concave arc portion 63C of the holder block 63
After the electrode guide 65 is inserted between the
7 is actuated, and the electrode guide 65 is pressed against the groove 61G by the lock member 69, whereby the electrode guide 65 is fixed.

By operating the actuator 67 in the opposite direction,
By releasing the pressing of the electrode guide 65 by the lock member 69, the electrode guide 65 can be removed downward.

The electrode guide 65 has a flange 7
This is a configuration in which a guide piece 73 is fixed in a cylindrical guide holder 71 provided with 1F. This guide holder 71
Although the outside diameters are all the same. The diameter of a guide hole (not shown) provided at the center of the guide piece 73 is formed to have various dimensions so as to correspond to the diameter of the electrode 11.

Therefore, every time the diameter of the electrode 11 mounted on the main shaft 13 changes, it is necessary to replace the electrode 11 with an electrode guide 65 having a guide hole corresponding to the diameter of the electrode 11.

As will be understood, the spindle head 9 in the small hole electric discharge machine 1 according to the present embodiment has the electrode 1 in a state where the electrode holder 21 is previously attached to the upper end.
1 can be replaced. In the electrode guide device 15, the electrode guide 65 can be attached and detached and replaced in accordance with the diameter of the electrode 11.

The electrode 11 is attached to and detached from the spindle head 9, and the electrode guide 6 is attached to the electrode guide device 15.
In order to automatically perform the attachment / detachment / replacement of the 5, an exchange device 75 (see FIG. 1) is disposed at a side position of the small hole electric discharge machine 1.

As schematically shown in FIG.
Is a post 77 erected at a side position of the small hole electric discharge machine 1.
An electrode exchanging device 79 is provided at the upper end of the device, and an electrode guide exchanging device 81 is provided below the electrode exchanging device 79.

More specifically, as shown in FIG. 6, a hollow member 83 having a hollow portion 83C is attached to the upper end of the post 77, and a support body 85 is integrally formed on the upper portion of the hollow member 83. It is attached to.

A first bracket 87 having a tip protruding in the direction of the small hole electric discharge machine 1 is integrally attached to the support main body 85 by bolts or the like, and the tip is in a direction opposite to the first bracket 87 in the opposite direction. A second bracket 89 protruding from the bottom is detachably mounted via mounting tools 91 such as a plurality of bolts.

A rotating shaft 95 is vertically and rotatably supported at the distal end of the first bracket 87 via a bearing 93. The driven pulley 9 is mounted on the upper end of the rotating shaft 95.
7 is attached, and a chain sprocket 99 is provided at the lower end.
Is installed. The drive pulley 10 attached to the drive shaft of the servomotor M6 attached to the first bracket 87
1 and the driven pulley 97, a timing belt 10
3 is hanging.

At the tip of the second bracket 89, a chain sprocket 105 is rotatably supported.
An endless chain 107 surrounding the support main body 85 is horizontally wound around the chain sprocket 105 and the chain sprocket 99.

Therefore, the endless chain 107 can be driven to travel horizontally by driving the servo motor M6.

When the chain link of the endless chain 107 is extended to make the endless chain 107 longer, the mounting bracket 91 is loosened, the second bracket 89 is removed, and the second bracket 89 is replaced with a longer second bracket. By attaching the chain sprocket 105 to the bracket, it can be easily handled.

That is, by preparing the second brackets of various dimensions, it is possible to easily cope with the case where the endless chain 107 is lengthened or shortened.

The endless chain 107 functions as an electrode stocker for holding a plurality of electrodes 11, and a plurality of holder supporting members 109 for detachably supporting the electrode holder 21 are mounted on the outer periphery thereof at a predetermined pitch. It is.

As shown in FIG. 7, the holder supporting member 109 has an engaging recess 109 for engaging and supporting the electrode holder 21.
C is provided to open outward. And the engagement recess 1
In the present embodiment, ball plungers 111 are provided on both side wall portions of 09C as fixed holding tools for fixedly holding the electrode holder 21.

Therefore, in FIG. 7, the electrode holder 21 can be attached to and detached from the holder supporting member 109 from the left and right directions.

By the way, in this embodiment, the configuration in which the ball plunger 111 is provided as the fixing holder has been described. However, in order to further simplify the configuration, an appropriate position of the engagement concave portion 109C, for example, the rear wall portion is provided. It is also possible to provide a magnet 113 in a portion and omit the ball plunger 111.

Note that only one or both of the pole plunger 111 and the magnet 113 may be used as the fixing holder, and a clip using the elasticity of a leaf spring may be used.

In order to address the plurality of holder supporting members 109 attached to the endless chain 107, dogs 115 are attached to the holder supporting member 109 indicating the origin position as shown in FIG. At the position, an appropriate sensor 117 for detecting the dog 115 is attached.

Further, the electrode 11 can be
A sensor 119 for detecting whether or not the electrode holder 21 is mounted on the holder support member 109 is provided at a position corresponding to the electrode replacement position for performing the attachment / detachment replacement.

In order to supply the electrode holder 21 supported by the holder supporting member 109 indexed to the electrode replacement position to the small-hole electric discharge machine 1, the electrode mounted on the small-hole electric discharge machine 1 is used. In order to pull the holder 21 into the empty holder support member 109 indexed to the electrode replacement position, the electrode holder transfer device 1 is moved to a position below the endless chain 107.
21 are provided.

More specifically, as shown in FIG. 6, a reciprocating device 123 such as a fluid pressure cylinder is disposed in the hollow portion 83C of the hollow member 83, and the reciprocating device 123 is provided with reciprocating motion. A slide bar 125 is integrally connected to the distal end of the reciprocating rod 123R via a bracket.

The slide bar 125 is provided with the hollow member 83.
The slide bar 125 is supported by a slide guide 127 so as to be able to reciprocate freely.

On the upper surface of the support block 129, a pair of holding claws 131 capable of holding the electrode holder 21 at the front end side is mounted via a pin 133 so as to be openable and closable. An actuator 135 such as a mini-cylinder for opening and closing the pair of holding claws 131 is mounted between the base portions.

With the above configuration, the electrode exchange device 7
In No. 9, the endless chain 107 can be circulated by driving the servo motor M6.

The dog 11 provided on the holder support member 109 for the origin position attached to the endless chain 107
5 by setting the position detected by the sensor 117 as the origin position and detecting and managing the number of rotations of the servomotor M6 (for example, each holder support member 109 corresponds to the sensor 119 for each rotation of the servomotor M6). The position of the holder support member 109 indexed to the position corresponding to the sensor 119 can be detected.

As described above, when the servo M6 is driven to index and position the desired holder support member 109 at the electrode replacement position, the presence or absence of the electrode holder 21 is detected by the sensor 119.

As described above, the desired holder support member 109
After indexing the electrode holder to the electrode replacement position, the electrode holder transfer device 12
When the reciprocating device 123 is operated to move the reciprocating rod 123R forward while holding the holding claws 131 of FIG. 1 in the open state, the electrode holder 21 indexed to the electrode replacement position is held between the pair of holding claws 131. See in.

Thereafter, when the actuator 135 is operated in a direction to close the holding claws 131, the electrode holder 21 is moved.
Are held by a pair of holding claws 131.

After the electrode holder 21 is clamped by the pair of clamping claws 131 as described above, when the reciprocating rod 123R is further advanced, the electrode holder 121 is opposed to the ball plunger 111 or the magnet 113 provided on the holder support member 109. Is the engagement recess 10 of the holder support member 109.
9C, is transferred to the small-hole electric discharge machine 1 side, and is attached to the main shaft 13 of the small-hole electric discharge machine 1.

On the contrary, when the empty holder supporting member 109 is indexed and positioned at the electrode replacement position,
The electrode holder 21 can be removed from the main shaft 13 of the small hole electric discharge machine 1 and can be supported by the empty holder supporting member 109.

Referring again to FIG. 1, the electrode guide changing device 81 is mounted on the post 77 at a position below the electrode changing device 75 so that the vertical position can be adjusted.

That is, a bracket 137 is attached to the post 77 so that the vertical position can be adjusted, and a slide guide 139 is attached to the bracket 137. The slide guide 139 is supported by a slide member 141 which is horizontally reciprocated by a reciprocating device (not shown) such as a fluid pressure cylinder or the like. There is provided an electrode guide stocker 143 that detachably supports 65.

As shown in FIG. 9, the electrode guide stocker 1
43 is a plate made of a plurality of magnets 14 for magnetically holding a plurality of electrode guides 65 on the upper surface.
5 is buried.

In the above configuration, the electrode guide changing device 8
1, the electrode guide stocker 143 located at the retreat position is advanced toward the small-hole electric discharge machine 1 so that the stocker 143 can be positioned at the electrode guide attaching / detaching exchange position.

As described above, after positioning the electrode guide stocker 143 at the electrode guide attachment / detachment replacement position, the machining head 7 in the small hole electric discharge machine 1 is moved to the stocker 143.
It is positioned above the desired electrode guide 65 above.

Thereafter, when the machining head 7 is lowered, the electrode guide device 15 is inserted into the electrode guide device portion between the V-shaped groove 61G of the V block 61 and the concave arc portion 63 of the holder block 63 in the electrode guide device 15. A desired electrode guide 65 is relatively inserted and engaged. Therefore, the electrode guide 65 is attached to the electrode guide device 15 by subsequently operating the actuator 67 and pressing the electrode guide 65 with the lock member 69.

As understood from the above description,
The electrode guide 65 can be attached to and detached from the guide device 15 in accordance with the diameter of the electrode 11.

As described above, in order to prevent the electrode 11 from swinging when the electrode 11 is attached to or detached from the main shaft 13 of the machining head 7 in the small hole electric discharge machine 1,
The lifting frame 14 of the processing head 7 is provided with an electrode deflection preventing device 147.

As schematically shown in FIG. 1, the electrode shake preventing device 147 has a structure in which a shake preventing member 151 is supported by a vertical guide bar 149 attached to a lower portion of the lifting frame 14 so as to be vertically movable. It is.

More specifically, as shown in FIGS. 10 and 11, a U-shaped bracket provided with an upper arm 153U, a lower arm 153L, and an intermediate connecting portion 153M on the side of the lifting frame 14 in the processing head 7. A guide bar 149 is vertically supported between the upper and lower arms 153U and 153L.

The guide bar 149 has the lifting block 1
55 is supported so as to be able to move up and down, and the anti-sway member 151 is attached to the elevating block 155.

The tip of the vibration preventing member 151 extends in a direction approaching the axis of the spindle 13 provided on the spindle head 9, and the tip restricts the electrode 11 mounted on the spindle 13. V-shaped groove 15 for preventing runout
1G is formed.

A magnet 157 for magnetism is attached to one of the spindle head 9 and the elevating block 155 in order to integrally move the shake preventing member 151 up and down following the vertical movement of the spindle head 9.

Further, the guide bar 149 supports a stopper block 159 for setting the stop position of the run-out preventing member 151 in a vertically movable manner. The stopper block 159 can be fixed at a desired height position by a fixing tool such as a lock screw (not shown).
5 is provided with a magnet 161 for magnetically holding 5.

With the above configuration, when the electrode 11 is mounted on the spindle 13 in a state where the spindle head 9 is at the highest position as shown in FIG. 1, the vicinity of the lower end portion of the electrode 11 becomes the groove 151G of the shake preventing member 151. And the run-out is regulated. Therefore, large deflection of the electrode 11 is prevented.

When the spindle head 9 is lowered while rotating the electrode 11 at the time of electric discharge machining, the deflection of the electrode 11 is suppressed by the groove 151G of the anti-vibration member 151, so that a fine hole electric discharge machining with higher precision is possible. is there.

As described above, when the spindle head 9 descends and the magnet 157 comes into contact with the elevating block 155, the anti-vibration member 151 resists magnetic adhesion by the magnet 161.
Lowers integrally with the spindle head 9. When the spindle head 9 moves up, it is magnetically attached to the magnet 157 and moves up integrally.

When the elevating block 155 comes up integrally with the spindle head 9 and comes into contact with the stopper block 159, it is released from the spindle head 9 against magnetic adhesion by the magnet 157, and the stopper block 1 is moved by the magnet 161.
59 is magnetically held.

Since the height of the stopper block 159 can be adjusted, the height of the stopper block 159 is adjusted in advance in accordance with the initial length of the electrode 11 corresponding to the portion where the deflection (amplitude) of the electrode 11 increases. By doing so, the deflection of the electrode 11 can be effectively prevented.

In the above-described configuration, the electrode guide device 1 is attached to and detached from the spindle 13 of the spindle head 9 of the machining head 7 of the small hole electric discharge machine 1.
The attachment / detachment / replacement of the electrode guide 65 with respect to 5 is performed as follows.

That is, the electrode holder 21 is attached to the main shaft 13.
Is mounted, the machining head 7 in the small hole electric discharge machine 1 is first positioned at the electrode replacement position of the small hole electric discharge machine 1.

In the electrode replacement device 79, the endless chain 107 is rotated to position the empty holder support member 109 at the electrode replacement position corresponding to the sensor 119.

Next, the operating rod 123R of the electrode holder transfer device 121 is advanced, and the electrode holder 21 held on the main shaft 13 is held by the pair of holding claws 131. Then, the fixing of the electrode holder 21 by the chuck 23 is released. Then, the spindle head 9 is raised and the electrode holder 21 is removed from the spindle 13.

After that, the operating rod 123R is retracted,
The removed electrode holder 21 is replaced with an empty holder support member 109.
And is magnetically attached to the magnet 113. Then, the pair of holding claws 131 are opened to retract the operating rod 123R to the last retracted position.

Next, after the servo motor M6 in the electrode exchanging device 79 is driven to index and position the desired holder support member 109 to the electrode exchanging position, the operating rod 123R in the electrode holder transferring device 121 is advanced, and The electrode holder 21 held by the holder supporting member 109 is held by the holding claws 131.

Thereafter, the operating rod 123R is further advanced against the magnetic attachment of the holder support member 109 by the magnet 113, and the electrode holder 21 held by the holding claws 131 is moved to the small hole electric discharge machine 1. It is positioned below the spindle head 9. Then, the spindle head 9 is lowered and the chuck 23 provided on the spindle 13 is attached to the electrode holder 2.
After mounting 1, the gripping by the gripping claws 131 is released, and the operating rod 123R is retracted to the original position.

When the new electrode holder 21 is mounted on the main shaft 13 as described above, the lower side of the electrode 11 suspended from the electrode holder 21 is placed under the electrode shake preventing device 147.
Since the vibration is restricted by being located in the groove 151G of the vibration preventing member 151, large vibration of the electrode 11 is effectively prevented.

Electrode 1 detached from and replaced with spindle head 9
In order to perform the attachment / detachment replacement of the electrode guide 65 corresponding to the diameter of 1, the electrode guide stocker 143 of the electrode guide replacement device 81 is first advanced from the retracted position and positioned at the electrode guide attachment / detachment replacement position.

Next, the electrode guide device 15 in the machining head 7 in the small hole electric discharge machine 1 is moved to the stocker 14.
The third electrode guide 65 is positioned at a position corresponding to the magnet 145 in an empty space where the electrode guide 65 is not provided, and the electrode guide 65 mounted on the electrode guide device 15 is magnetically attached to the magnet 145 and released. Let it rise.

Thereafter, the electrode guide device 15 is positioned above the desired electrode guide 65 held by the electrode guide stocker 143 and lowered, and the desired electrode guide 65 is inserted into the V-shaped groove of the V block 61. After being inserted into the mounting portion between 61G and the concave arc portion 63C of the holder block 63, the electrode guide 65 can be replaced with an electrode guide 65 corresponding to the diameter of the electrode 11 by pressing the electrode guide 65 with the lock member 69. You can do it.

As described above, after replacing the electrode 11 and replacing the electrode guide 65 corresponding to the diameter of the electrode 11,
When the machining head 7 is positioned corresponding to a desired position of the workpiece W and the spindle head 9 is lowered, the lower end of the electrode 11 is guided by the tapered hole 59T of the guide piece 59 and inserted into the electrode guide 65. .

Then, electric discharge is started between the electrode 11 and the work W, and electric discharge machining of a fine hole is performed on the work W.

[0138]

As will be understood from the above description of the embodiment, the invention according to claim 1 is a method for replacing an electrode in a small-hole electric discharge machine, in which a machining head in the small-hole electric discharge machine is connected to an electrode. (A) positioning at an exchange position;
(B) indexing a desired electrode held in the electrode stocker to an electrode exchange position, and using a pair of clamping claws provided to reciprocate the electrode indexed to the electrode exchange position in an electrode holder transfer device. (C) transferring horizontally and linearly to a position below the main spindle provided in the processing head and positioning the main head, and lowering the main spindle and attaching it to the upper end portion of the electrode in advance by a chuck provided in the main spindle. A seal provided at the lower end of a sealing member which is urged downward to the main shaft and held inside so as to hold the electrode holder and prevent leakage of machining fluid supplied to the electric discharge machining portion via the chuck and the electrode. (D) bringing the upper end of the electrode holder into close contact with the ring.

According to the above configuration, the machining head in the small hole electric discharge machine is positioned at the electrode replacement position, the desired electrode held in the electrode stocker is indexed to the electrode replacement position, and then the electrode is transferred to the electrode holder transfer device. The work is horizontally and linearly transferred to a position below the main shaft of the processing head by the holding claws provided in the above, and then the main shaft is lowered, and the electrode holder attached to the upper end portion of the electrode by the chuck provided on the main shaft. When held, the upper end of the electrode holder is brought into close contact with the seal ring provided at the lower end of the seal member that is urged downward to the main shaft and provided therein, thereby preventing leakage of the working fluid.

Therefore, it is possible to easily perform the small hole electric discharge machining by repeating the conversion of the electrodes.

According to a second aspect of the present invention, there is provided an electrode guide replacement method in a small-hole electric discharge machine, wherein an electrode guide stocker holding a plurality of electrode guides to be attached to and detached from a machining head in the small-hole electric discharge machine is provided. (A) positioning the electrode guide at the electrode guide attachment / detachment replacement position, and (b) positioning the processing head at a position above a desired electrode guide held by the electrode guide stocker positioned at the electrode attachment / detachment replacement position. (C) engaging the desired electrode guide with the electrode guide mounting portion provided on the processing head, and fixing the electrode guide by a lock device provided on the electrode guide mounting portion (d). Process.

With the above arrangement, the electrode guide stocker holding the plurality of electrode guides is positioned at the electrode guide exchange position, and after the processing head is positioned above the desired electrode guide on the electrode guide stocker, the processing head is positioned. Then, after the electrode guide is mounted on the electrode guide mounting portion, the electrode guide can be securely mounted on the electrode guide mounting portion by operating the lock device.

Therefore, the electrode guide can be easily attached and detached in accordance with the change in the diameter of the electrode.

According to a third aspect of the present invention, a plurality of holder support members are provided on an endless chain which is provided so as to be able to travel horizontally, and which supports an electrode holder attached to an upper end portion of an electrode in a horizontally removable manner. An electrode holder transfer device capable of holding the electrode holder supported by the holder support member indexed to the position and transferring the electrode holder to the electrode exchange position of the small hole electric discharge machine is provided horizontally below the endless chain. It is.

Therefore, the electrode holder supported by the holder supporting member indexed and positioned at a predetermined position can be horizontally transferred to the electrode replacement position of the small hole electric discharge machine by the electrode holder transfer device, Can be attached to

Since the holder supporting member has a magnet (permanent magnet) for fixing and holding the electrode holder, the electrode holder can be easily attached to and detached from the holder supporting member. While being able to
The electrode holder can be reliably fixed to the holder supporting member.

According to a fifth aspect of the present invention, an electrode guide stocker holding a plurality of electrode guides to be attached to and detached from a machining head of a small hole electric discharge machine is moved to an electrode guide exchange position of the small hole electric discharge machine. Since it is provided movably, the electrode guide can be exchanged according to the diameter of the electrode mounted on the small hole electric discharge machine, and it is possible to correspond to electrodes of various diameters.

According to the sixth aspect of the present invention, since the electrode guide stocker is provided with a magnet for fixing and holding the electrode guide, the electrode guide can be easily attached to and detached from the electrode guide stocker. The electrode guide can be securely fixed to the guide stocker.

According to a seventh aspect of the present invention, a processing head is provided on a slider provided to be movable in the front-rear and left-right directions at a position above the worktable so as to be adjustable in a vertical position. In a small-hole electric discharge machine having a configuration in which a main shaft provided with a chuck for holding the electrode is vertically movable and provided with an electrode guide device for guiding the electrode at a position below the main shaft, the chuck has an upper end portion of the electrode. In order to prevent the leakage of the working fluid flowing from the chuck to the electrode via the electrode holder, the seal ring is in close contact with the upper end of the electrode holder. In this configuration, the sealing member provided on the main shaft is urged downward and is housed in the main shaft, so that even when the electrodes are replaced, the leakage of the working fluid is ensured each time. It is intended.

According to an eighth aspect of the present invention, the electrode guide device has a tapered hole for guiding the lower end portion of the electrode as a center, and the electrode guide device is inserted into a V-shaped groove of a V block provided below the tapered hole. The electrode guide that guides the electrode is press-fixable and detachable and replaceable, so that the electrode guide can be exchanged in response to changes in the diameter of the electrode. Can be reliably conducted.

According to a ninth aspect of the present invention, a processing head is provided on a slider provided so as to be movable in the front-rear and left-right directions at a position above a worktable so as to be capable of adjusting the vertical position. In a small-hole electric discharge machine having a configuration in which a spindle having a chuck for holding is provided so as to be vertically movable and an electrode guide device for guiding the electrode at a position below the spindle, the electrode guide device is provided at a lower end of the electrode. A tapered hole that guides around the portion, and an electrode guide that guides the electrode to the V-shaped groove of the V block provided below the tapered hole is press-fixable and detachably replaceable. In addition, the electrode can be reliably guided to the electrode guide that has been detached and replaced, and the electrode can be guided by the electrode guide.

According to a tenth aspect of the present invention, there is provided an electrode provided with a run-out preventing member having a V-shaped groove for restricting the electrode from a horizontal direction to prevent the run-out of the electrode when the electrode is mounted on the chuck of the spindle. Since the apparatus is provided with the shake prevention device, the shake of the electrode can be effectively prevented.

According to an eleventh aspect of the present invention, in the electrode vibration preventing device, a V-shaped vibration preventing member for engaging and supporting the electrode from the horizontal direction is provided, and the vibration preventing member is vertically integrated with the main shaft. Since it is movable and provided so as to be able to be fixed and stopped at a predetermined position, when the electrode is rotated at the time of electric discharge machining, it is possible to effectively prevent the deflection of the intermediate portion of the electrode, and the machining accuracy is further improved. .

According to a twelfth aspect of the present invention, a magnet for integrating both is provided on one of the spindle head side and the anti-vibration member, and the anti-vibration member is provided on one of the anti-vibration member and the fixed portion. Since it is provided with a magnet for fixing and stopping at the position, it is lowered integrally with the lowering of the spindle head side due to the consumption of the electrode, and rises integrally when the spindle head side is raised, and fixed at a predetermined position It is fixed to the part.

Therefore, when the electric discharge machining is performed while rotating the electrode, the swing of the electrode can be effectively prevented, and the precise small hole electric discharge machining can be performed.

According to a thirteenth aspect of the present invention, a collet is inserted into a cylindrical outer cylinder detachably attached to a chuck provided on a main shaft of a small-hole electric discharge machine by using an electrode holder mounted on an upper end portion of an electrode. A hole is provided, and a collet capable of holding and fixing the electrode is provided by being inserted into the collet insertion hole, a sealing elastic member is provided between the upper surface of the collet and the collet insertion hole, and formed below the collet. Since the screw member capable of tightening the tapered portion is screwed to the outer cylinder in an adjustable manner, when the collet is tightened by the screw member, the electrode is clamped and fixed by the collet, and the sealing elastic member is formed. It is compressed to exhibit a sealing effect.

Since the sealing elastic member according to the fourteenth aspect of the present invention simultaneously seals between the collet insertion hole and the collet and between the collet and the electrode, the attachment of the electrode holder to the electrode and the electrode can be performed. And the collet can be easily sealed.

[Brief description of the drawings]

FIG. 1 is a perspective view conceptually showing a relationship between a small-hole electric discharge machine and an exchange device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a mounting state of an electrode holder with respect to a main shaft in the small hole electric discharge machine.

FIG. 3 is an explanatory perspective view of a collet.

FIG. 4 is a plan view showing an electrode guide device.

FIG. 5 is a front view of the same.

FIG. 6 is an explanatory front view of the electrode exchanging device.

FIG. 7 is an explanatory plan view of a holder support member.

FIG. 8 is an explanatory plan view of a holding claw portion.

FIG. 9 is an explanatory side view showing a relationship between an electrode guide stocker and an electrode guide device.

FIG. 10 is an explanatory front view of the electrode deflection preventing device.

FIG. 11 is an explanatory plan view of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Small hole electric discharge machine 7 Machining head 9 Spindle head 11 Electrode 13 Spindle 14 Elevating frame 15 Electrode guide device 21 Electrode holder 23 Chuck 25 Outer cylinder 27 Collet 29 Bag nut 31 Elastic member for sealing 33 Sealing member 39 Seal ring 59 Guide Piece 61 V block 63 Holder block 65 Electrode guide 69 Lock member 75 Exchange device 79 Electrode exchange device 81 Electrode guide exchange device 107 Endless chain 109 Holder support member 121 Electrode holder transfer device 131 Clamping claw 143 Electrode guide stocker 147 Electrode deflection prevention device 151 Anti-sway member 155 Elevating block

Claims (14)

(57) [Claims] An electrode exchanging method in a small-hole electric discharge machine includes the following steps: (a) positioning a machining head in a small-hole electric discharge machine to an electrode exchanging position; (B) a step of indexing a desired electrode held in the electrode stocker to an electrode exchange position, and (c) a pair of electrodes that are indexed to the electrode exchange position and are reciprocally provided in an electrode holder transfer device. (C) lowering the main shaft and moving the main shaft to a position below the main shaft provided on the processing head by the holding claws; In order to hold the attached electrode holder and to prevent the leakage of machining fluid supplied to the electric discharge machining portion via the chuck and the electrode, the sealing member which is urged downward to the main shaft and installed therein Step allowed to contact the upper end of the electrode holder to the seal ring with the end. 2. A method of replacing an electrode guide in a small-hole electric discharge machine, the method comprising the following steps: (a) attaching and detaching exchange to and from a machining head in the small-hole electric discharge machine; (B) positioning the electrode guide stocker holding the plurality of electrode guides at the electrode guide attachment / detachment / exchange position, and (b) processing the head above the desired electrode guide held at the electrode guide stocker positioned at the attachment / detachment / exchange position. (C) lowering the processing head and engaging a desired electrode guide with an electrode guide mounting portion provided on the processing head; (d) using a lock device provided on the electrode guide mounting portion A step of fixing the electrode guide. 3. A plurality of holder supporting members for removably supporting an electrode holder mounted on an upper end portion of an electrode in a horizontal direction are provided on an endless chain provided so as to be able to travel horizontally, and indexed and positioned at a predetermined position. An electrode holder transfer device capable of holding the electrode holder supported by the holder support member and transferring the electrode holder to the electrode exchange position of the small hole electric discharge machine is provided horizontally below the endless chain. Electrode exchange device. 4. The electrode exchange device according to claim 3, wherein the holder supporting member includes a magnet (permanent magnet) for fixing and holding the electrode holder. 5. An electrode guide stocker holding a plurality of electrode guides to be attached to and detached from a machining head of a small-hole electric discharge machine so as to be movable to an electrode guide exchange position of the small-hole electric discharge machine. The electrode exchange device according to claim 3 or 4, wherein: 6. The electrode exchange device according to claim 5, wherein the electrode guide stocker includes a magnet for fixing and holding the electrode guide. 7. A processing head is provided on a slider which is provided at a position above the work table so as to be movable and positionable in the front-rear and left-right directions.
In a small-hole electric discharge machine having a configuration in which a spindle having a chuck for holding an electrode upper end portion is provided so as to be vertically movable, and an electrode guide device for guiding the electrode is provided below the spindle, the chuck has an electrode An electrode holder attached to the upper end of the electrode holder is detachable and replaceable, and a seal ring that is in close contact with the upper end of the electrode holder so as to prevent leakage of machining fluid flowing from the chuck to the electrode via the electrode holder. A small hole electric discharge machine characterized in that a seal member provided at a lower end portion is biased downward to be mounted inside the main shaft. 8. An electrode guide device having a tapered hole for guiding a lower end portion of the electrode as a center, and pressing an electrode guide for guiding an electrode into a V-shaped groove of a V block provided below the tapered hole. The small-hole electric discharge machine according to claim 7, wherein the small-hole electric discharge machine is configured to be fixable and detachable. 9. A main spindle provided with a processing head movably and vertically adjustable at a position above and below a worktable in the front-rear and left-right directions, the processing head being provided with a chuck for holding an upper end of an electrode. Is provided so as to be movable up and down, and a small hole electric discharge machine having an electrode guide device for guiding the electrode at a position below the main shaft, wherein the electrode guide device has a taper that guides around a lower end portion of the electrode. A small hole discharge comprising an electrode guide for guiding an electrode to a V-shaped groove of a V block provided below the tapered hole, the electrode guide being press-fixable and detachably replaceable. Processing machine. 10. An electrode vibration preventing device comprising a vibration preventing member having a V-shaped groove for restricting the electrode from horizontal direction and preventing the electrode from oscillating when the electrode is mounted on the chuck of the spindle. The small-diameter electric discharge machine according to claim 7, 8, or 9. 11. An electrode deflection preventing device, comprising: a deflection preventing member provided with a V-shaped groove for regulating an electrode from a horizontal direction. The deflection preventing member is vertically movable at a predetermined position integrally with the main shaft. The small-diameter electric discharge machine according to claim 10, wherein the small-hole electric discharge machine is provided so as to be capable of being fixedly stopped. 12. A magnet for integrating both of them on one of the spindle head side and the shake preventing member, and one of the shake preventing member and the fixed portion for fixing and stopping the shake preventing member at a predetermined position. The small hole electrical discharge machine according to claim 11, further comprising a magnet. 13. A collet fitting hole is provided in a cylindrical outer cylinder detachably mountable on a chuck provided on a main shaft of a small-hole electric discharge machine as an electrode holder to be used by being mounted on an upper end portion of the electrode, thereby clamping the electrode. A fixable collet is inserted into the collet insertion hole, a sealing elastic member is provided between the upper surface of the collet and the collet insertion hole, and a taper formed at the lower portion of the collet can be tightened. An electrode holder, wherein a member is adjustably screwed to the outer cylinder. 14. The electrode holder according to claim 13, wherein the sealing elastic member is configured to simultaneously seal between the collet insertion hole and the collet and between the collet and the electrode.