JP2889896B2 - Elevating processing tank - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a lifting / lowering type machining tank used for die sinking electric discharge machining or wire cut electric discharge machining.

(Prior Art) FIGS. 7 and 8 show a conventional machining tank in an electric discharge machine, respectively. FIG.
The processing tank body 4 is vertically movably mounted so as to surround a table 3 on which a work 2 to be processed by the electrode 1 is set.
A packing 5 is provided on the sliding surface with the table 3. This apparatus lifts the processing tank main body 4 upward as shown by a solid line to fill the processing liquid 6 during processing, and removes the work 2 or sets the processing tank main body 4 at two points when setting a new work. It is lowered as indicated by a chain line, and the overflowed machining fluid is returned to a machining fluid tank (not shown).

The processing tank shown in FIG. 8 is disclosed in Japanese Patent Application Laid-Open No. 64-11723, in which the lower side of a bellows-like cylindrical side wall 7 is fixed to the upper surface of the table 3 and the hook 8 on the upper side of the side wall 7 is connected. The work fluid 6 is put into the support 10 provided in the outer tank 9 and the working fluid 6 is put therein. When the work 2 is set or taken out, the hook 8 is removed from the support 10 to shrink the side wall 7 and the working fluid 6 is removed. From the side wall 7.

(Problem to be Solved by the Invention) In the processing tank shown in FIG. 7, the space between the processing tank body 4 and the table 3 is formed as a sliding surface, and the processing tank slides through the packing 5. Because there is packing 5
However, there is a problem in that when the material is deformed or deteriorated, the machining fluid 6 may leak from that portion.

In the processing tank shown in FIG. 8, although there is no possibility of leakage of the processing liquid 6, when the bellows-shaped side wall 7 is contracted, the processing liquid 6 is almost entirely discharged from the side wall 7 to the outside. When setting and processing, the side wall 7
There is a problem that the working fluid has to be put into the inside, and it takes time to set up. In addition, in the configuration and system shown in FIG. 8, since the upper surface of the outer tub 9 is of a fixed type that does not descend, and the upper surface is always located above the upper surface of the table 3, the advantage of the so-called machining tub elevating system is obtained. Could not be enjoyed enough.

In view of the above problems, the present invention has a configuration in which there is no problem of machining fluid leaking from a portion of machining fluid packing, and the work of replenishing machining fluid when performing machining by setting a new work is reduced. An object of the present invention is to provide an elevating type processing tank.

(Means for Solving the Problems) In order to achieve the above object, an elevating type processing tank according to the present invention forms a space between a work setting table and the periphery thereof so as to surround the table. A main body is provided, and an elevating device for moving the processing tank main body up and down is provided, a processing liquid outlet for overflow is formed at an upper portion of the processing tank main body, and a height of the processing liquid outlet for overflow on the inner periphery of the processing tank main body is provided. When a resin sheet is stretched between the part and the table, and the processing tank body is raised by the elevating device,
Forming a container for processing fluid containing the table as a bottom surface and the sheet as a side wall, and when the processing tank main body is lowered by the elevating device, the sheet hangs down in the gap, and the processing liquid hangs in a sag portion due to the drooping. Characterized in that a liquid reservoir is formed.

(Operation) When processing is performed, the processing tank main body is raised by an elevating device to form a container having a table as a bottom surface and a sheet as a side wall, and a processing liquid is accommodated in the container and set on the table. The work is immersed in the working fluid for processing.
When the work is taken out, the processing liquid in the container overflows from the processing liquid outlet for overflow, the processing tank main body is lowered by the elevating device, and the sheet is dripped in the gap, and the processing liquid is dripped into the sagging portion. And the remaining machining fluid is used for the next machining.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a side view of an electric discharge machining apparatus showing an embodiment of a machining tank according to the present invention, in which a head 13 is vertically movably mounted along a column 12 erected on a base 11, and an electrode holder of the head 13 is provided. Attach electrode 1 to 14.

On the base 11, an X-axis motor 15 and a Y-axis motor
Table whose position is controlled in X and Y directions by 16 respectively
The table 3 on which the work 2 is set is mounted via the components 17 and 18. An outer tank 19 is mounted on the position control table 18 so as to surround the table 3 on which the workpiece 2 is set.
As shown in the perspective view of FIG. 2, a processing tank main body 20 having a vertical opening structure is mounted in the inside 19 so as to be vertically movable.

A gap 21 is formed between the processing tank body 20 and the table 3, and a durable resin sheet 22 such as rubber or a rubber-based or fluorine-based resin is provided in the gap 21 as follows. . That is, inside the sheet 22, there is provided a multi-stage elastic protective plate 23 made of steel plate or the like for protecting the sheet 22, as shown in FIG. The lower plate 23b is fixed to the inner surface of the table 20 and the lower plate 23b is fixed to the protective plate 25 fixed to the table 3 by screws 28 and nuts 29 to secure the sheet
The plate is slid up and down in multiple stages as the processing tank body 20 moves up and down, and expands and contracts. As shown in FIG.
It looks like the figure. Further, the upper end of the sheet 22 is sandwiched between the base plate 23a at the upper end of the protective plate 23 and the sandwiching plate 27, and is fastened and fixed by screws 28 and nuts 29. Reference numeral 30 denotes a protection net made of polyamide resin or the like provided on the back surface of the sheet 22,
The protection net 30 supports the sheet 22 and bears the load caused by the working fluid 6 to prevent the sheet 22 from being damaged.

31 is a base plate 23a at the upper end of the protection plate 23 and a sheet 2 overlapping this
2. A machining fluid outlet for machining fluid overflow provided on the holding plate 27, a bellows-like hose 32 for overflow is connected to the machining fluid outlet 31, and directly to a machining fluid tank (not shown) or to an outer tank 19. After flowing out to the working fluid tank, it is configured.

FIG. 5 is a perspective view showing the structure of an apparatus for raising and lowering the processing tank body 20, and FIG. 6 is a longitudinal sectional view, in which brackets are provided above and below the inner surface of the outer tank 19 corresponding to the vicinity of four corners of the processing tank body 20. 33,
Attach the guide pole to these brackets 33 and 34
The ball bushings 36 mounted near the four corners of the processing tank body 20 are fitted to the respective guide poles 35 so as to be vertically movable.

In FIG. 5, reference numeral 37 denotes a motor such as a stepping motor or a servo motor installed on the table 18 shown in FIG. 1, and four drums 40 to 43 are mounted on an output shaft 38 thereof. Wire rope 44 wrapped around 43
To 47, a V-pulley 49 provided above the four corners of the inner surface of the outer tank 19.
Alternatively, it is connected to the ball bush 36 by hanging on V pulleys 48 and 49 provided above and below, and further on a V pulley 50 attached to the ball bush 36. Therefore, by rotating the motor 37 in the forward and reverse directions, the wire ropes 44 to 47 are wound up,
The processing tank body 20 is raised and lowered. In addition, the motor 37 has a brake device 37b in addition to the speed reducer 37a, and has a structure in which the brake is actuated simultaneously with the stop of the motor 37. Stop at

On the inner surface of the outer tub 19 facing the surface on the long side of the processing tub body 20, there is provided a roller 51 for preventing the swelling of the processing tub main body 20 due to the hydraulic pressure of the processing liquid 6 acting when the processing tub main body 20 moves up and down. ,
Provided in contact with the outside of the processing tank body 20,
The burden of lifting and lowering is reduced, and lifting and lowering is facilitated.

In FIG. 4, reference numeral 52 denotes a stopper which is opened at the time of cleaning the table and allows the processing liquid to flow out together with the processing waste.

During processing, as shown in FIGS. 1 to 3, the processing tank lifts the processing tank body 20 and transfers the processing liquid 6 to the sheet 22.
Fill and process. The machining fluid supplied to the machining unit during machining overflows from the machining fluid outlet 31 to make the level of the machining fluid a constant level corresponding to the height of the machining tank body 20. After the processing is completed, when the processing tank body 20 is lowered as shown in FIG. 4, the processing tank body 20 side of the sheet 22 is also lowered, so that a part of the processing liquid 6 remains in the sheet 22 and the processing is performed. After the subsequent work is taken out, when the work 2 is newly set on the table 3 and the processing tank body 20 is lifted, the processing liquid 6 remaining in the sheet 22 returns to the table 3 and is newly replenished. For example, the amount of the working fluid to be used can be reduced by half.

Although the above description has been given by taking the example of the die sinking electric discharge machining, the present invention can also be applied to the wire cut electric discharge machining.

In addition, the electric discharge machining apparatus for drilling or engraving shown in FIG. 1 is a table 1 whose position is controlled in the X and Y directions.
The table 3 on which the work 2 is set, the outer tank 19, the processing tank body 20 and the like are provided on 7 and 18. The processing tank of the present invention is based on the table 3 on which the work 2 is set. Fixed directly or indirectly to the outer tank 19
Are fixed to the base 11 directly or indirectly, and the tables 17 and 18 whose position is controlled in the X and Y directions are connected to the electrode 1.
Side, that is, between the upper end portion of the column 12 and the processing head 13, the processing head 13 is held on the column 12 and the position is controlled.
No. 21, publication No. 61-270023, which is effective when applied to the electric discharge machine described in JP-A No. 61-270023, etc., and exerts any effect as a drilling or die-sinking electric discharge machine equipped with a vertically movable machining tank. is there.

(Effects of the Invention) According to the invention of claim 1, a gap is provided between the periphery of the table on which the work is set and the processing tank main body, and the height portion of the overflow processing fluid outlet on the inner circumference of the processing tank main body and the table. Since the upper and lower ends are fixed and the resin sheet is provided in the gap, when raising and lowering the processing tank body by the lifting device,
Since there is no sliding portion, there is no danger that the working fluid will leak. Further, when the processing tank body descends, the processing liquid is stored in the sag portion hanging down in the gap of the resin sheet, so that the supply amount of the processing liquid to be re-injected when performing a new processing is small, and the work efficiency is reduced. Is improved. Also, when processing by raising the processing tank body, since the weight of the processing liquid is supported by the table and the resin sheet, high strength is not required particularly on the side wall of the processing tank body. Since the structure can be simplified, the manufacturing is easy, and the processing tank main body can be made lightweight, so that the load on the elevating device can be reduced.

According to the invention of claim 2, since the lifting device has a structure in which the processing tank main body is stopped at an arbitrary height, the height of the overflow processing liquid outlet is set according to the height of the workpiece. The depth of the working fluid can be set arbitrarily.

According to the invention of claim 3, the weight of the working fluid is supported by the resin protection net provided on the side of the sheet facing the inner surface of the processing tank main body, and the load is not applied to the sheet. Life can be extended.

According to the invention of claim 4, since the multi-stage elastic protective plate is provided on the inner surface of the sheet, it is possible to prevent the sheet from being erroneously damaged during various operations such as attachment and detachment of a work and an electrode.

According to the fifth aspect of the present invention, since the pressing roller for suppressing the swelling of the processing tank main body due to the hydraulic pressure of the processing liquid is provided, the processing tank main body is moved by the hydraulic pressure of the processing liquid acting when the processing tank main body is moved up and down. It is possible to prevent the side wall from expanding and to smoothly move the processing tank body up and down.

According to the invention of claim 6, the elevating guide pole is set up outside the processing tank main body, and the ball bush fixed to the processing tank main body is fitted to the elevating guide pole so as to be able to move up and down.
The processing tank body can be smoothly moved up and down by being guided by the elevating guide balls.

[Brief description of the drawings]

FIG. 1 is a side view showing an electric discharge machine equipped with one embodiment of a machining tank according to the present invention, FIG. 2 is a perspective view of the machining tank of the embodiment, and FIGS. Is a perspective view showing a part of the processing tank body when the processing tank body is raised and lowered, and FIG.
FIG. 6 is a perspective view showing the lifting device of the embodiment, FIG. 6 is a longitudinal sectional view showing the lifting device, and FIGS. 7 and 8 are sectional views showing a conventional processing tank. 1: Electrode, 2: Workpiece, 3: Table, 6: Working fluid, 20: Working tank body, 21: Void, 22: Sheet, 23: Protection plate, 30: Protection net, 35: Guide pole, 36: Ball bush , 37: motor, 37a: speed reducer, 37b: brake device, 38: output shaft, 40
~ 43: Drum, 44-47: Wire rope, 48-50: V pulley

Claims (6)

(57) [Claims] In an elevating machining tank used for electric discharge machining in which a work set on a table is immersed in a machining fluid and machined, a gap is formed between the work and a periphery of the table on which the work is set. A processing tank main body is provided so as to surround the table, and an elevating device for moving the processing tank main body up and down is provided, and a processing liquid outlet for overflow is formed at an upper portion of the processing tank main body. A resin-made sheet is stretched between the height of the overflow processing liquid outlet and the table, and when the processing tank body is raised by the elevating device, the processing liquid storage container having the table as a bottom surface and the sheet as a side wall. Forming, when the processing tank body is lowered by the lifting device, the sheet hangs down in the gap,
A lifting / lowering type processing tank, wherein a liquid pool of a processing liquid is formed in a sag portion caused by the drooping. 2. The up-down type processing tank according to claim 1, wherein the lifting device has a structure in which the processing tank body is stopped at an arbitrary height. 3. The up-down type processing tank according to claim 1, wherein a protective net made of resin is provided so as to overlap the sheet facing the inner surface of the processing tank body. 4. The lifting type as claimed in claim 1, further comprising a multi-stage elastic protective plate provided on an inner surface of the sheet, the multi-stage elastic protecting plate which protects the sheet and slides up and down in multiple stages. Processing tank. 5. A pressing roller for suppressing swelling of the processing tank main body due to the hydraulic pressure of the processing liquid is provided in contact with the outside of the processing tank main body.
5. The elevating-type processing tank according to claim 1, wherein the elevating processing tank is provided at more than one location. 6. An elevating guide pole is set up outside the processing tank main body, and a ball bush fixed to the processing tank main body is fitted to the elevating guide pole so as to be vertically movable. Elevating type processing tank described in 1.