JP5233546B2 - Electric discharge machine - Google Patents

Description

  The present invention relates to an electric discharge machine equipped with an electrode attachment device for attaching an electrode to a main shaft of an electric discharge machine.

  As an electric discharge machine equipped with a conventional electrode mounting apparatus, there is an electric discharge machine electrode mounting apparatus in which a slide mechanism that locks and slides the upper part of an electrode on the head side of the electric discharge machine is provided. The slide means includes a first jig that includes a plurality of rollers and is connected to the head side, and a second jig that is in contact with the rollers and slides and is connected to the electrode side (see, for example, Patent Document 1).

  In addition, the workpiece is held on the lower side in a transfer device that transfers the workpiece attached to the workpiece attachment position in the electric discharge machining apparatus and the electrode attached to the lower surface of the electrode mounting portion that can be moved up and down above the workpiece attachment position. The work holding part and the electrode holding part for holding the electrode on the upper side are provided with a gantry provided in two upper and lower stages. The work holding part is provided with lifting means for raising and lowering the work by a predetermined stroke, and the electrode is biased upward. Disclosed is an electric discharge machining workpiece and an electrode conveying device in which an urging means is provided in an electrode holding portion, and a slide means is provided that slides a pedestal in an electric discharge machining apparatus so as to advance and retreat (see, for example, Patent Document 2). .)

Further, in an electric discharge machine that performs machining by generating electric discharge between an electrode and a workpiece, a table for mounting the workpiece, a spindle for mounting the electrode, a feed driving means for relatively moving the table and the electrode, and a lower portion of the spindle An electrode mounting plate for mounting a large electrode that cannot be automatically replaced, an electrode chuck for mounting a small electrode that can be replaced automatically, provided on both the left and right sides of the electrode mounting plate, and an open upper surface surrounding the table Small electrode is exchanged between electrode chuck and electrode magazine, each of which is provided on the left and right sides of machining tank for storing machining fluid, electrode magazine for storing multiple automatically replaceable small electrodes, respectively And an electrode exchanging means that disposes a small electrode on the electrode chuck even when the large electrode is mounted on the electrode mounting plate. In example, see Patent Document 3.).
Japanese Patent Laid-Open No. 7-253941 JP-A-8-185944 Japanese Patent Laid-Open No. 2007-228981

  However, according to Patent Document 1, the second jig has a beam-like shape, and a heavy electrode is repeatedly mounted, so that the sliding surface of the second jig on which the roller slides is worn, or There is a problem that it is difficult to maintain and maintain accuracy because the second jig and the roller have to be frequently inspected due to wear of the roller and the like. Furthermore, the crane work for transporting the electrode and the clamping work to the head side of the electric discharge machine are linked, and the work is dangerous because the electrode is heavy.

  According to Patent Document 2, the mold as the workpiece is a large mold, and the electrode is also a large electrode. Since the large mold and the large electrode are attached to the transport apparatus at the same time, the transport apparatus is further enlarged. Become. And since a large metal mold | die and a large electrode are conveyed to an electrical discharge machine with a large sized conveying apparatus, there exists a problem which the restriction | limiting arises in the shape and dimension of workpiece | work, such as a metal mold | die. Moreover, since the electrode set component for setting the electrode is infiltrated into the machining fluid containing the chip, there is a problem that the accuracy of the electrode set is lowered by entraining the chip in the electrode set component.

  According to Patent Document 3, the large electrode is attached by a crane, and the large electrode is attached to the main shaft of the electric discharge machine by crane work and manual work. For this reason, there is a problem that it takes a long time to parallel the electrodes.

  The present invention has been made in view of the above-mentioned problems. With a processing tank having a limited volume, it is possible to attach a large electrode to a main shaft and set a large work to a processing tank. It is an object of the present invention to provide an electric discharge machine that is safe for a series of operations for setting a workpiece, does not require positioning adjustment for electrode mounting, can reduce the work time, and can be mounted on a spindle with high accuracy.

  In order to solve the above-mentioned problem, the invention described in claim 1 is a processing tank for setting a work to be electrodischarged between electrodes, a main shaft to which an electrode is attached, a main shaft side guide of guide means provided on the main shaft, Spindle side mounting jig in which the main shaft side clamp of the clamp means is disposed, the electrode side guide of the guide means provided on the electrode and mated with the main shaft side guide, and the electrode side clamp of the clamp means clamped by the main shaft side clamp The electrode side mounting jig is provided in combination with a plurality of frame frames provided in the processing tank, and at least one of the plurality of frame frames can be rotated. A temporary placement table for temporarily placing the provided electrode; and a free bearing that is disposed on the frame and adjusts the position of the electrode temporarily placed on the temporary placement table.

  Further, the invention according to claim 2, the free bearing comprises a lower plate member facing the upper surface of the temporary table and an upper plate member facing the electrode plate of the electrode side mounting jig fixed to the electrode, A sphere is provided between the lower plate member and the upper plate member, and a part of the sphere protrudes from at least one surface of the upper surface of the upper plate member or the lower surface of the lower plate member.

  In the invention according to claim 3, the sphere of the free bearing is in contact with the electrode plate.

  According to the first aspect of the present invention, since at least one of the plurality of underframes can be moved, when the electrode is attached to the main shaft, the movable underframe (hereinafter referred to as the movable portion) located on the tank wall side is rotated. By forming a temporary placement table by rotating (for example, 90 degrees), the electrode side mounting jig fixed to the electrode can be temporarily placed on the free bearing of the temporary placement table. When electric discharge machining is performed with the workpiece set in the machining tank, a machining space can be secured by rotating the movable portion toward the tank wall side of the machining tank. As a result, even in a limited space of the machining tank, it is possible to attach a large electrode, set a large workpiece, and perform electric discharge machining without being disturbed.

  In addition, when the electrode temporarily placed on the temporary table is attached to the spindle, if the spindle gradually moves downward, the spindle side guide (for example, a guide hole, hereinafter referred to as a guide hole) of the guide means of the spindle side mounting jig is placed on the electrode side. The tip of an electrode side guide (for example, a guide shaft, hereinafter referred to as a guide shaft) of the guide means of the mounting jig abuts, and the guide shaft receives force from the guide hole. Then, the electrode integrated with the electrode side mounting jig is moved by the free bearing, and the guide hole is engaged with the guide shaft. Also, the main shaft side clamp of the crank means of the main shaft side mounting jig (for example, convex side clamp, hereinafter convex convex clamp) is the electrode side clamp (for example, the concave side clamp, hereinafter referred to as concave side clamp) of the crank means of the electrode side mounting jig. The electrode is attached to the main shaft. And by adjusting the guide means and the crank means in advance so that the electrode is mounted horizontally at a predetermined position on the main shaft, the electrode can be accurately placed at a predetermined position on the main shaft without adjusting the leveling. It can be installed and work time can be shortened. In addition, since it is not necessary to adjust the leveling of the electrodes, the safety of a series of operations for attaching the electrodes to the spindle can be ensured.

  In the invention according to claim 2, a part of the free bearing sphere protrudes from at least one surface of the upper surface of the upper plate member or the lower surface of the lower plate member. The electrode plate can move in parallel with a slight force with respect to the spindle-side mounting jig fixed to the spindle. As a result, when the guide hole comes into contact with the tip of the guide shaft, the guide shaft moves substantially horizontally on the free bearing while being guided by the guide hole, and the guide hole smoothly fits with the guide shaft. The electrode is attached to the main shaft after being clamped by the clamping means. Therefore, the electrode can be automatically and accurately attached to a predetermined position of the main shaft without adjusting the leveling, and the working time can be shortened. In addition, since it is not necessary to adjust the leveling of the electrodes, the safety of a series of operations for attaching the electrodes to the spindle can be ensured.

  In the invention according to claim 3, the sphere of the free bearing contacts the electrode plate. That is, when a part of the sphere protrudes from both the upper surface of the upper plate member and the lower surface of the lower plate member, the free bearing can move relative to the temporary placement table by rotating the sphere, and the electrode temporarily placed on the sphere. Can move relative to the free bearing. Therefore, the amount obtained by adding the amount of movement of the free bearing relative to the temporary table and the amount of movement of the electrode relative to the free bearing is the amount of movement of the electrode plate relative to the main shaft. As a result, the adjustment range in which the electrode plate can be positioned is expanded as compared with the case where only a part of the sphere protrudes.

  On the other hand, when a part of the sphere protrudes only from the upper surface of the upper plate member, the sphere rotates so that the free bearing cannot move relative to the temporary table, and the electrode temporarily placed on the sphere moves relative to the free bearing. it can. Therefore, since the sphere does not roll on the upper surface of the temporary table, when a part of the sphere protrudes from both the upper surface of the upper plate member and the lower surface of the lower plate member, and a part of the sphere is only from the lower surface of the lower plate member. Compared with the case where it protrudes, the durability of the upper surface of the temporary table is improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 4 are perspective views showing a state of a series of steps for setting an electrode and setting a workpiece of an electric discharge machine equipped with an electrode mounting apparatus according to an embodiment of the present invention. FIG. 1 shows a state where the movable part of the temporary table is located on the tank wall side of the processing tank and the door of the processing tank is opened. FIG. 2 shows a state in which the electrode on which the electrode side mounting jig is fixed is conveyed above the temporary table by a crane (not shown). In the drawing, a work 4 indicated by a one-dot chain line is set on the table 11 in FIG. FIG. 3 shows a state in which the electrodes are temporarily placed on the temporary placement table. FIG. 4 shows a state in which the workpiece is set on the table and the spindle on which the electrode is attached is moved upward.

As shown in FIGS. 1 to 4, an electric discharge machine 1 (hereinafter referred to as an electric discharge machine) provided with an electrode mounting device 2 includes a machining tank 10, a main shaft 20, a main shaft side mounting jig 31 of a mounting jig 30, and An electrode side mounting jig 41 (FIGS. 2 and 3) and a temporary table 50 are provided. The electrode mounting device 2 includes a mounting jig 30 and a temporary placement table 50. The processing tank 10
It is comprised from the tank wall 10a, the tank wall 10b, the tank wall 10c, the tank wall 12, and the baseplate 13, and the tank wall 12 can be opened and closed. Moreover, the processing tank 10 arrange | positions the table 11 which can move to the X direction of the plane orthogonal to the main axis | shaft 20 (FIG. 3), and the tank wall 12 of the processing tank 10 which can be opened and closed. The tank wall 12 is opened when the electrode 3 is attached to the spindle 20 and when the workpiece 4 (FIGS. 2 and 4) is set on the table 11, and the tank wall 12 is filled when the machining tank 10 is filled with machining fluid and when electric discharge machining is performed. Is closed.

  The main shaft 20 is disposed above the processing tank 10 and is movable in the X and Y directions on a plane orthogonal to the main shaft 20 and the Z direction of the main shaft 20. A spindle plate 32 of the spindle-side mounting jig 31 described below is positioned at predetermined positions in the X and Y directions by positioning pins (not shown) on the lower surface of the spindle 20, and a large number of bolts (not shown). ).

  The attachment jig 30 is disposed on the main shaft 20 and the electrode 3 in order to attach the large electrode 3 to the main shaft 20 in a safe, easy and accurate manner. That is, the mounting jig 30 includes a main shaft side mounting jig 31 fixed to the main shaft 20 and an electrode side mounting jig 41 fixed to the electrode 3.

  FIG. 5 is a partial front view of FIG. 3 showing the spindle 20 to which the spindle-side mounting jig 31 is fixed and the electrode 3 to which the electrode-side mounting jig 41 is fixed. FIG. 6 is a view of the main shaft plate 32 of the main shaft side mounting jig 31 as viewed from the A direction (FIG. 5).

As shown in FIGS. 5 and 6, the spindle-side mounting jig 31 includes a spindle plate 32 that is fixed to the lower surface of the spindle 20 with a large number of bolts (not shown), and four pieces that are fixed to the spindle plate 32. A convex clamp 33 a of the clamping means 33 such as an air clamp and two guide holes 34 provided in the main shaft plate 32 are provided.

  FIG. 7 is a view of the electrode plate 42 as viewed from the B direction (FIG. 5). As shown in FIGS. 5 and 7, the electrode side mounting jig 41 is screwed into the electrode plate 42, the concave side clamps 33 b of the four clamping means 33 fixed to the electrode plate 42, and the screw holes of the electrode plate 42. Two guide shafts 44 to be worn are provided. The electrode plate 42 is positioned at predetermined positions in the X direction and the Y direction by positioning pins (not shown) on the upper surface of the electrode 3 and fixed by a large number of bolts (not shown). The guide shaft 44 is inserted into and engaged with the guide hole 34 and serves as a guide when the electrode 3 is attached to the main shaft 20. In addition, the X and Y direction positions of the electrode plate 42 can be accurately positioned with respect to the main shaft 20. Provided. A guide means 43 is formed by the guide hole 34 (main shaft side guide) and the guide shaft 44 (electrode side guide).

  The clamp means 33 is composed of a pair of a convex side clamp 33a (main shaft side clamp) and a concave side clamp 33b (electrode side clamp). The concave side clamp 33b is inserted into the convex side clamp 33a and clamped with air. The electrode 3 is attached and fixed to the main shaft 20. The convex clamp 33a, the concave clamp 33b, the guide hole 34, and the guide shaft 44 are adjusted in advance so that the electrode 3 is horizontally mounted at a predetermined position of the main shaft 20, and fixed to the main shaft plate 32 and the electrode plate 42. Is done. Therefore, the electrode 3 is clamped horizontally by the clamping means 33.

  The main shaft plate 32 may be provided with the concave clamp 33b of the clamp means 33 and the guide shaft 44 of the guide means 43, and the electrode plate 42 may be provided with the convex clamp 33a of the clamp means 33 and the guide hole 34 of the guide means 43. .

  FIG. 8 is a plan view of the temporary table 50, and FIG. 9 is a front view of the temporary table 50. As shown in FIGS. 1, 2, 8, and 9, the temporary table 50 includes a first fixed part 51 (frame), a second fixed part 52 (frame), and a movable part 53 (frame). Composed. The 1st fixing | fixed part 51 and the 2nd fixing | fixed part 52 are fixed to the table 11 with the several volt | bolt 13 by the corner | angular part side of the processing tank 10, ie, tank wall 10a, 10b side (FIG. 1), respectively. The movable part 53 is provided with a hinge 55 (FIG. 8) and can be rotated 90 degrees. And when the temporary placing stand 50 is not used, the movable part 53 is located in the tank wall 10b side, and the temporary placing stand 50 is substantially L-shaped (FIG. 1). When the temporary table 50 is used, it is rotated 90 degrees counterclockwise as viewed from above in FIG. 1 to be substantially U-shaped (FIG. 2), and the rotation is locked for ensuring safety. In this state, the electrode 3 fixed to the electrode plate 42 can be temporarily placed on the temporary placement table 50. The second fixed portion 52 and the movable portion 53 are shorter than the first fixed portion 51 so that the workpiece 4 (FIG. 4) can be set in the center of the processing tank 10.

  An L-shaped guide member 54 having a L-shaped cross section is fixed to the upper surfaces of the first fixed portion 51, the second fixed portion 52, and the movable portion 53 with bolts 14, and the electrode plate 42 is guided by the guide member 54. (Not shown) is smoothly placed on the upper surface of the temporary placement table 50, whereby the electrode 3 is temporarily placed on the temporary placement table 50.

  FIG. 10 is a top view of the first free bearing 60 (free bearing) and the second free bearing 70 (free bearing). The first free bearing 60 is disposed on the upper surface of the first fixed portion 51, and the second free bearing 70 is disposed on the upper surfaces of the second fixed portion 52 and the movable portion 53.

  11 and 12 show the respective free bearings 60 fixed on the upper surface of the temporary placing table 50 and the electrode plates temporarily placed on the steel balls 64 of the free bearing 60 in the DD cross section and the EE cross section of FIG. 42 and the fixing | fixed part 51 are shown. As shown in FIGS. 10 to 12, the first free bearing 60 includes an upper plate member 61, a lower plate member 65, eleven steel balls 64 (spheres), and two collars 68. The upper plate member 61 has a small hole 62a having a diameter smaller than the diameter of the steel ball 64, a large hole 62c having a diameter larger than the diameter of the steel ball 67, and a tapered hole 62b connecting the small hole 62a and the large hole 62c. A number of tapered stepped holes 62 are opened. Similarly, the lower plate member 65 has a small hole 66a having a diameter smaller than the diameter of the steel ball 64, a large hole 66c having a diameter larger than the diameter of the steel ball 64, and a tapered hole connecting the small hole 66a and the large hole 66c. Eleven tapered stepped holes 66 having 66 b are opened at the same position in the longitudinal direction of the upper plate member 61. Then, the steel ball 64 is inserted into the tapered stepped hole 62 and the tapered stepped hole 66 so as to be shared, and the lower surface 61b of the upper plate member 61 is overlapped with the upper surface 65a of the lower plate member 65, so that 12 countersunk screws are provided. 81 is screwed into the screw hole of the lower plate member 65. In this state, the eleven steel balls 64 protrude from the upper surface 61a of the upper plate member 61 and the lower surface 65b of the lower plate member 65 and can rotate smoothly.

  Further, the upper plate member 61 is provided with through holes 63 at two locations, and the through hole 67 is provided at the position of the lower plate member 65 in the same longitudinal direction as the upper plate member 61. The through hole 63 is larger than the diameter of the through hole 67, and a stepped collar 68 is inserted into the through hole 63 and the through hole 67. The lower end surface on the small diameter side of the collar 68 protrudes from the lower surface 65 b of the plate member 65 and abuts on the upper surface of the first fixing portion 51 of the temporary placement table 50. Then, a hexagon socket head bolt 82 is inserted into the stepped hole 68 a of the collar 68 and screwed into a screw hole provided on the upper surface of the first fixing portion 51. The EE cross section of the first free bearing 60 has the same structure. The first free bearing 60 is fixed to the first fixing portion 51 at two locations with hexagon socket bolts 82 with collars 68 provided on both sides in the longitudinal direction. In this state, the lower surface 65b of the lower plate member 65 is fixed in a state of being lifted from the upper surface of the first fixing portion 51, and the lower ends of the eleven steel balls 64 are rotatable so as to be rotatable. Touching the top surface. A slight gap is provided between the pressing surface of the head of the hexagon socket head bolt 82 and the step surface of the stepped hole 68a so that the first free bearing 60 can move.

  The second free bearing 70 includes an upper plate member 71, a lower plate member 75, eleven steel balls 64 (spheres), and two collars 68, and has the same structure as the first free bearing 60. 13 and 14 are temporarily placed on the second free bearing 70 fixed to the upper surface of the temporary placing table 50 and the steel ball 64 of the second free bearing 70 in the FF cross section and the GG cross section of FIG. The electrode plate 42, the fixed part 52, and the movable part 53 are shown. That is, the lower surface 71b of the upper plate member 71 and the upper surface 75a of the lower plate member 75 are overlapped by nine countersunk screws 81, and the steel balls 64 are tapered stepped holes 72 (small holes 72a and tapered holes) of the upper plate member 71. 72b and the large hole 72c) and the tapered stepped hole 76 (the small hole 76a, the tapered hole 76b and the large hole 76c) of the lower plate member 75. A part of the steel ball 64 protrudes from the upper surface 71 a of the upper plate member 71 and the lower surface 75 b of the lower plate member 75. A collar 68 is inserted into the through hole 73 of the upper plate member 71 and the through hole 77 of the lower plate member 75 provided on both sides in the longitudinal direction. Then, the hexagon socket head cap bolt 82 is inserted into the stepped hole 68 a of the collar 68, and is fixed to each of the second fixed portion 52 and the movable portion 53. In this state, the lower surface 75b of the lower plate member 75 is fixed in a state of floating from the upper surfaces of the second fixed portion 52 and the movable portion 53, and the lower end of the steel ball 64 is fixed from the lower surface 75b of the lower plate member 75. It protrudes and contacts the upper surface of the second fixed part 52 and the rotatable movable part 53. A slight gap is provided between the pressing surface of the head of the hexagon socket head bolt 82 and the step surface of the stepped hole 68a so that the second free bearing 70 can move.

  As described above, in a state where the electrode 3 is temporarily placed on the temporary placement table 50, the lower surface of the electrode plate 42 has the upper ends of the 11 steel balls 64 of the first free bearing 60 and the two sets of second free bearings 70. It contacts the upper ends of the 16 steel balls 64.

  Further, a radial clearance C (for example, 1 mm) is provided between the hexagon socket head bolt 82 provided on both longitudinal sides of the free bearings 60 and 70 and the small diameter hole 68b of the stepped hole 68a of the collar 68 (FIG. 11). 12). Accordingly, the first free bearing 60 and the second free bearing 70 can move ± 1 mm on the XY plane with respect to the center axis of each hexagon socket head bolt 82.

  A part of the steel ball 64 of the first free bearing 60 and the first free bearing 70 protrudes from the upper surface 71 a of the upper plate member 71 and the lower surface 75 b of the lower plate member 75, but the upper surface 71 a or the lower plate member 75. It only has to protrude from at least one of the surfaces.

  Further, the shape of the tapered stepped hole 62 of the upper plate member 61 and the shape of the tapered stepped hole 66 of the lower plate member 65 may be any shape as long as the steel ball 64 can smoothly rotate and does not separate from the tapered stepped holes 62 and 66. .

  Next, the operation and effect of the embodiment of the present invention will be described. From the state (FIG. 1) where the movable portion 53 of the temporary placement table 50 is located on the tank wall 10b side, the movable portion 53 is turned 90 degrees counterclockwise as viewed from above in FIG. The hinge 55 is locked. Then, the electrode 3 to which the electrode side mounting jig 41 is attached is suspended from the hook 5 of the crane by the hanging rope 6 and is automatically conveyed to the upper center of the temporary placement table 50 of the electric discharge machine 1 and then downwards therefrom. The electrode 3 is temporarily placed on the temporary placement table 50. At this time, the three side surfaces of the electrode plate 42 of the spindle-side mounting jig 31 attached to the electrode 3 are guided by the six guide members 54 arranged on the temporary placement table 50. The electrode plate 42 is placed on the steel ball 64 of the first free bearing 60 provided in the first fixed part 51 and on the steel ball 64 of the second free bearing 70 provided in the second fixed part 52 and the movable part 53. It is done. Next, the spindle 20 to which the spindle-side attachment jig 31 is attached automatically moves to the upper center of the electrode-side attachment jig 41 of the temporarily placed electrode 3 and gradually moves downward therefrom. Then, the inner peripheral surfaces of the two guide holes 34 (FIGS. 5 and 6) provided in the main shaft plate 32 come into contact with the tips of the tapered portions of the guide shafts 44 (FIGS. 5 and 7) provided in the electrode plate 42. When the main shaft 20 is further lowered, the tapered portion of the guide shaft 44 receives a force from a place where the inner peripheral surface of the guide hole 34 abuts. This force is sequentially transmitted to the electrode plate 42, the electrode 3, and the steel ball 64, and the steel ball 64 rotates. The rotation of the steel ball 64 moves the electrode plate 42, the first free bearing 60, and the second free bearing 70, and the guide hole 34 is inserted into the guide shaft 44 and engaged. Thereby, the electrode 3 is accurately positioned at a predetermined position on a plane orthogonal to the main shaft 20, that is, a predetermined position in the X direction and the Y direction. At this time, the adjustable amount of movement of the electrode 3 with respect to the main shaft 20 is approximately twice the radius clear run, that is, the amount of movement C of the steel ball 64 (for example, about 1 mm), and the first free bearing 60 or the second free bearing 70. Is a value obtained by adding the movement amount C (for example, 1 mm) of approximately 2C (for example, approximately 2 mm) (when the central axis of the steel ball 64 is on the central axis of the tapered stepped holes 62 and 72).

  When the guide hole 34 is inserted into the guide shaft 44 and engaged, the convex clamp 33a provided on the main shaft plate 32 is inserted and clamped into the concave clamp 33b provided on the electrode plate 42. Then, the electrode 3 is adjusted in advance so as to be kept horizontal and attached to a predetermined position of the main shaft 20, and the convex side clamp 33 a, the concave side clamp 33 b and the guide shaft 44 are fixed to the main shaft plate 32 and the electrode plate 42, respectively. Thus, the electrode 3 is attached to the main shaft 20 and the horizontal position is ensured with high accuracy.

  As shown in FIG. 4, when the attachment of the electrode 3 to the main shaft 20 is completed, the hinge 55 is unlocked, and the movable portion 53 is rotated 90 degrees clockwise as viewed from above in FIG. The movable part 53 is moved to the side. And the workpiece | work 4 is set to the center predetermined position of the table 11 with a crane. Next, the tank wall 12 is closed, the machining tank 10 is filled with the machining liquid, the spindle 20 to which the electrode 3 is attached moves to the upper center of the workpiece 4, and electric discharge machining is started.

  According to the above, the electrode 3 provided with the electrode side attachment means 41 is automatically transported and temporarily placed on the temporary placement table 50 of the processing tank 10 by the crane. The temporary placement table 50 includes a first fixed portion 51, a second fixed portion 52, and a movable portion 53, and in order to secure a machining space when the workpiece 4 is set in the machining tank 10 and is subjected to electric discharge machining. The movable part is rotated toward the tank wall 10b side of the processing tank 10 and is positioned there. When the electrode 3 is attached to the main shaft, the movable portion 53 located on the tank wall 10 b side is rotated by 90 degrees, and the electrode 3 is temporarily placed on each of the fixed portions 51 and 52 and the movable portion 53. As a result, even in a limited space of the machining tank 10, the large electrode 3 can be attached and the large workpiece 4 can be set, and electric discharge machining can be performed.

  An electrode side mounting jig 41 is mounted on the electrode 3, and a main shaft side mounting jig 31 is mounted on the spindle 20. The electrode 3 to which the electrode side mounting jig 41 is attached is automatically transported to the temporary placement table 50 of the processing tank 10 by a crane and temporarily placed on the temporary placement table 10 using the guide member 54 as a guide. When the electrode 3 is attached to the main shaft 20, the main shaft 20 moves downward, and the guide hole 34 of the main shaft side mounting jig 31 is moved by the first free bearing 60 and the second free bearing 70. Is inserted into the guide shaft 44 of the pole-side mounting jig 41. Then, the convex clamp 33a of the spindle-side mounting jig 31 is inserted into the concave clamp 33b of the electrode-side mounting jig 41 and clamped with air. Thereby, since the positioning adjustment is unnecessary, the electrode 3 is secured safely, and can be attached to the predetermined position of the main shaft 20 with high accuracy in a short time.

  Further, since a part of the steel ball 64 protrudes from at least one surface of the upper surface 61a of the upper plate member 61 or the lower surface 65b of the lower plate member 65, the electrode 3 attached to the electrode 3 temporarily placed on the temporary placement table 50 is attached. The jig 41 can move in parallel to the spindle-side mounting jig 31 fixed to the spindle 20. As a result, the guide shaft 44 fixed to the electrode plate 42 also moves in parallel with the shaft-side mounting jig 31 while being guided by the guide hole 34 provided in the main shaft plate 32, so that the main shaft 20 moves downward. The guide hole 34 is smoothly inserted and engaged with the guide shaft 44. Thereafter, the electrode 3 is attached to the main shaft 20 by being clamped by the clamping means 33. As a result, since the electrode plate does not need to be adjusted in position, safety is ensured and the electrode plate can be horizontally and accurately attached to a predetermined position of the main shaft 20 in a short time.

  The steel balls 64 of the free bearings 60 and 70 are in contact with the electrode plate 42. When a part of the steel ball 64 protrudes from both the upper surface 61 a of the upper plate member 61 and the lower surface 65 b of the lower plate member 65, the amount of movement of each free bearing 60, 70 relative to the temporary table 50, and each free bearing 60, 70 The amount obtained by adding the amount of movement of the electrode 3 with respect to is the amount of movement of the electrode plate 42 relative to the main shaft 20. As a result, the adjustment range in which the electrode plate 42 can be positioned is expanded as compared with a case where only a part of the steel ball 64 protrudes. On the other hand, when a part of the steel ball 64 protrudes only from the upper surface 61 a of the upper plate member 61, the free bearing cannot move with respect to the temporary placing table 50, and the electrode 3 temporarily placed on the steel ball 64 is placed in each free bearing 60. , 70 can be moved. Accordingly, since the steel ball 64 does not roll on the upper surface of the temporary placing table 50, when a part of the steel ball 64 protrudes from both the upper surface 61a of the upper plate member 61 and the lower surface 65b of the lower plate member 65, and the steel ball Compared with a case where a part of 64 protrudes from the lower surface 65 b of the lower plate member 65, the durability of the upper surface of the temporary placing table 50 is improved.

  Further, when the steel ball 64 can move on the fixed parts 51 and 52 and the movable part 53 of the temporary table 50, the amount of movement is much smaller than that of the conventional technique. The durability of the upper surface and the steel ball 64 is higher than that of the prior art.

  Further, the attachment of the electrode 3 to the main shaft 20 is performed in a state where the tank wall 12 of the processing tank 10 is opened and there is no processing liquid in the processing tank 10. Chips mixed in the working fluid are not caught in the mounting jig 30, and the accuracy of the electrode set can be ensured.

  The movable portion 53 of the temporary table 10 rotates but may be translated. In this case, at the time of electric discharge machining, the movable part is located on the first fixed part 51 side, and at the time of electrode attachment, it is located at the position of the movable part 53 in the figure.

  In addition, one movable part 53 of the temporary table 10 is provided, but it is sufficient that the number of movable parts 53 is one or more. In any case, the large electrode 3 and the large workpiece 4 are respectively connected to the spindle 20 and the table. It is sufficient that the space for electric discharge machining can be secured.

It is a perspective view which shows the state by which the movable part of the temporary placement stand was located in the tank wall side of a processing tank, and the door of the processing tank was opened. It is a perspective view which shows the state in which the electrode was conveyed above the temporary placement stand. It is a perspective view which shows the state by which the electrode was temporarily placed on the temporary placement stand. It is a perspective view which shows the state which the main axis | shaft which attached the electrode moved above the workpiece | work. FIG. 3 is an enlarged partial front view in FIG. 2. It is the figure which looked at the spindle side attachment jig from the A direction (FIG. 5). It is the figure which looked at the electrode side attachment jig from the B direction (FIG. 5). It is a top view of a temporary placing stand. It is a front view of a temporary storage stand It is a top view of a 1st free bearing and a 2nd free bearing. It is DD sectional drawing of FIG. It is EE sectional drawing of FIG. It is FF sectional drawing of FIG. It is GG sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric discharge machine 3 Electrode 4 Work piece 10 Processing tank 20 Spindle 31 Spindle side attachment jig 33 Clamp means 33a Convex side clamp (Spindle side clamp)
33b Concave clamp (Electrode clamp)
34 Guide hole (Spindle side guide)
41 Electrode side mounting jig 42 Electrode plate 43 Guide means 44 Guide shaft (electrode side guide)
50 Temporary table 51 First fixed part (frame)
52 Second fixing part (underframe)
53 Movable part (underframe)
60, 70 Free bearing 61, 71 Upper plate member 61a, 71a Upper surface 64 Steel ball (sphere)
65, 75 Lower plate member 65b, 75b Lower surface

Claims (3)

A processing tank for setting a work to be electrodischarged between the electrodes;
A main shaft to which the electrode is attached;
A spindle mounting jig provided on the spindle and provided with a spindle guide of the guide means and a spindle clamp of the clamp means;
An electrode-side mounting jig provided with an electrode-side guide of the guide means that is provided on the electrode and meshes with the spindle-side guide, and an electrode-side clamp of the clamping means that is clamped by the spindle-side clamp;
It is formed by combining a plurality of frames provided in the processing tank, and at least one of the plurality of frames can be rotated, and when the electrode is attached to the main shaft, the electrode provided with the electrode side attachment means is temporarily installed. A temporary table to place,
An electric discharge machine comprising: a free bearing that is disposed on the frame and adjusts a position of the electrode that is temporarily placed on the temporary table. The free bearing includes a lower plate member facing the upper surface of the temporary table and an upper plate member facing the electrode plate of the electrode side mounting jig fixed to the electrode, and the lower plate member and the upper plate 2. The discharge according to claim 1, wherein a sphere is provided between the plate member and a part of the sphere protrudes from at least one of the upper surface of the upper plate member and the lower surface of the lower plate member. Processing machine. The electric discharge machine according to claim 1, wherein the sphere of the free bearing is in contact with the electrode plate.

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