JPH0737539U - Filter device for electric discharge machine - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a filter device for an electric discharge machine that can be easily disposed of and at a reduced cost. A filter device includes a cylindrical member having a perforated tubular member, a first end plate removably fastened to one axial end thereof, and a second end plate fixedly attached to the other end. The container includes a container and a detachable exchange discard type filter cartridge 10 housed inside the cylindrical container. The filter cartridge 10 has filter materials 12 and 13 made of glass fiber, cellulose, paper, or the like coaxially with the center perforated pipe 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a filter device for machining fluid filtering of an electric discharge machine.

[0002]

[Prior art]

 Electric discharge machines use the electric discharge removal phenomenon in the machining fluid to machine workpieces.For example, wire electric discharge machines that perform cutting out using thin wire electrodes and mainly shaped electrodes are mainly used. However, there are die-sinking EDM machines and the like that are suitable for machining three-dimensional shapes. In this type of electric discharge machine, the machining fluid plays a very important role in insulating between electrodes, generating impact pressure, cooling the heating part, etc., and removing machining scraps, etc. Let it be used repeatedly.

However, since machining waste and carbonaceous substances produced by combustion of the machining fluid are mixed in the machining fluid after being used for electric discharge machining, repeated use of such waste causes a short circuit phenomenon and an electric discharge machining instability phenomenon. There is a risk that continuous discharge or energy loss may occur due to the generation or deterioration of the insulation of the working fluid. Therefore, it is generally practiced to install a filter device in the middle of the circulation path of the working fluid and to filter the working fluid to remove the processing debris mixed in the working fluid for reuse.

FIG. 6 is a front view and a plan view showing the appearance of a conventional filter device used in this type of electric discharge machine.

As shown in FIG. 1, a conventional filter device has a cylindrical shape (for example, a straight diameter of 300 mm, a straight diameter of which is 300 mm, in which metal blind plates 61 and 62 are welded or adhered to both ends of a perforated metal cylinder 60 in the axial direction. The container 63 has a height of 500 mm, a filter (not shown) fixedly mounted inside the container 63, and packings 65 and 66 for sealing the working liquid introducing portion 64.

[0006]

[Problems to be solved by the device]

 However, according to the conventional filter device as described above, since the filter and the metal container are integrated and cannot be separated, the metal container must be discarded after use, and the disposal is extremely difficult. It's difficult. In addition, replacing the entire metal container increases the cost of the filter device itself, which increases the cost of electric discharge machining.

Therefore, the present invention provides a filter device for an electric discharge machine, which can be easily disposed of and can be reduced in cost.

[0008]

[Means for Solving the Problems]

 According to the present invention, a filter device for filtering foreign matters such as machining scraps contained in the machining fluid of an electric discharge machine is removable from a perforated tubular member and one axial end of the tubular member. A cylindrical container having a stopped first end plate and a second end plate fixedly attached to the other axial end of the tubular member, and is housed inside the cylindrical container. And a removable filter cartridge that is detachable.

[0009] Preferably, the replaceable filter cartridge described above is provided with a perforated pipe provided at a central portion of the shaft for inflowing a working fluid to be filtered, and a first pipe coaxial with the perforated pipe and surrounding the perimeter thereof. A filter material; a second filter material that is coaxial with the first filter material and surrounds the first filter material; and two end plates that seal and fix both axial ends of the first and second filter materials. There is.

[0010]

[Action]

 One end plate of the cylindrical container is removably fastened with a screw or twist lock, and the replaceable filter cartridge is detachably stored inside this container. Continue to use and replace only the filter cartridge. Most of the filter cartridges are made of paper or resin fiber, so they are easy to dispose of. Further, since the container is continuously used as it is, the cost for replacement can be significantly reduced.

[0011]

【Example】

 Hereinafter, the present invention will be described in detail with reference to embodiments using the drawings.

FIG. 2 is a diagram schematically showing a structural example of a machining fluid circuit of a wire electric discharge machine in which the filter device of the present invention is used.

In FIG. 1, reference numeral 20 denotes a machining tank in which wire electric discharge machining is actually performed in a immersed state, and the machining tank 20 is filled with a machining liquid 21. As the processing liquid 21, highly pure water, tap water, nonflammable oil, electrolytic solution, or the like is used.

The processing liquid is circulated, and the used processing liquid 21 from the processing tank 20 is stored in the waste liquid tank 22. The processing liquid in the waste liquid tank 22 is sent to the filter devices 24 and 25 according to the present invention by the filter pump 23, filtered, and then stored in the clean liquid tank 26.

The working liquid in the clean liquid tank 26 is sent to the working liquid temperature control device 28 by the supply pump 27 so that the temperature of the working liquid is adjusted, and then is fed again to the working tank 20 via the constant flow valve 29. The machining fluid from the machining fluid temperature control device 28 is supplied to the wire guide (not shown) of the electric discharge machining wire for cooling in addition to the machining tank 20. The machining fluid temperature control device 28 is for cooling the machining fluid in order to prevent unnecessary promotion of electric field action and thermal displacement of the machine.

Further, the processing liquid in the clean liquid tank 26 is configured to be able to maintain its purity by being sent to the purifier 31 by the ion exchange pump 30 and undergoing ion exchange. The specific resistance control device 33 connected to the sensor 32 is for maintaining the specific resistance value of the working fluid at a large constant value. The specific resistance value of the working fluid fluctuates due to the mixing of processing chips and the temperature rise. Therefore, depending on the detected specific resistance, for example, ion exchange is performed or an instruction for machining liquid temperature control is given. The rapid filling pump 34 is operated when the processing liquid is filled in the processing tank 20 after the wire breakage processing or the like.

FIG. 1 is a plan view showing an embodiment of a replaceable filter cartridge in a filter device of the present invention and a front view showing a section taken along the line AA in FIG. 1, and FIG. 3 is a replaceable filter cartridge of FIG. FIG. 6 is a perspective view of the filter cartridge cut along a plane perpendicular to the axis.

As shown in these figures, the replaceable filter cartridge 10 has a hole 11 made of, for example, resin or steel, which has a large number of holes for injecting a working fluid and is open at both ends. Preparing for the center. A first filter material 12 is coaxially provided outside the perforated pipe 11 so as to surround the perimeter thereof. A second filter material 13 is coaxially provided outside the first filter material 12 so as to surround the periphery thereof with a space. The first and second filter materials 12 and 13 are made of a filter paper having a structure in which a large number of glass fibers and cellulose synthesized from pulp are bent and bent.

At both ends in the axial direction of the filter cartridge 10, two end plates 14 made of, for example, resin or steel for sealing and fixing the both ends in the axial direction of the first and second filter materials 12 and 13 respectively, and 15 is fixed by adhesion. Opening holes 14a and 15a into which both ends of the perforated pipe 11 are inserted are provided at the axial center portions of the end plates 14 and 15, respectively, and packings 16 and 17 are provided around these opening holes 14a and 15a. Are attached respectively.

FIG. 4 is a cross-sectional view showing a plan view and a sectional view showing a front view of an embodiment of a container in which a filter cartridge in the filter device of the present invention is detachably housed.

As is clear from the figure, this cylindrical container 40 (for example, diameter 300 mm, height 500 mm) is composed of a cylindrical member 41, which is a cylindrical metal punching plate with a large number of holes. The first blind end plate 42 made of metal, which is detachably fixed to the upper end of the tubular member 41 in the axial direction by screws or twist locks, and the lower end of the tubular member 41 in the axial direction by adhesion or welding. And a second blind end plate 43 which is fixedly attached and is made of metal.

Opening holes 42a and 43a are provided in the axial center portions of the first and second blind end plates 42 and 43, respectively, and packings 44 and 45 are attached around them, respectively. ing. These opening holes 42a and 43a are configured so as to correspond to the opening holes 14a and 15a on the filter cartridge 10 side when the filter cartridge 10 is mounted in the container 40, respectively. A metal reinforcing band 46 is wound around the tubular member 41.

In the filter device, the replaceable filter cartridge 10 shown in FIGS. 1 and 3 is inserted into the container 40 shown in FIG. 4, and the first blind end plate 42 is attached by screwing or twisting. Completed by. If the filter device becomes dirty, the blind end plate 42 can be removed and the filter cartridge 10 can be replaced with a new one. As described above, according to the present invention, the replaceable filter cartridge 10 can be removably mounted inside the container 40. Therefore, when the filter becomes dirty, the container 40 is continuously used and only the filter cartridge 10 is replaced. Most of the filter cartridge 10 is made of paper, resin fiber or the like, so that it is very easy to dispose of it. Further, since the metal container 40 is continuously used as it is, the cost associated with replacement can be significantly reduced.

FIG. 5 is a cross-sectional view illustrating the mounting structure of the thus-configured filter device to the wire electric discharge machine.

As shown in the figure, when the filter device 50 is mounted in the filter tank 51 of the wire electric discharge machine, the bolt 52 provided in the filter tank 51 is inserted into the perforated pipe 11 of the filter device 50. Then, the filter device 50 may be fixed by the nut 54 with the packing 53 applied. The working fluid sent from the filter pump 23 shown in FIG. 2 is guided from the inlet 55 to the perforated pipe 11 and filtered by the filter materials 12 and 13 (FIGS. 1 and 3), and then the container 40 ( It goes out from a large number of holes of the cylindrical member 41 (FIG. 4) (FIG. 4) and is stored in the clean liquid tank 26.

The case of performing wire electric discharge machining in a state of being immersed in the machining fluid has been described above, but the filter device according to the present invention can be naturally applied to an electric discharge machine that ejects machining fluid from a nozzle to perform wire electric discharge machining. It can also be applied to a die-sinking electric discharge machine.

The embodiments described above are merely illustrative and not limitative of the present invention, and the present invention can be implemented in various other modifications and alterations. Therefore, the scope of the present invention is limited only by the scope of claims for utility model registration and their equivalents.

[0028]

[Effect of device]

 As described in detail above, according to the present invention, a perforated tubular member, a first end plate detachably fixed to one axial end of the tubular member, and the other axial end of the tubular member. Since a cylindrical container having a second end plate fixedly attached to the cylindrical container and a detachable replaceable filter cartridge housed inside the cylindrical container are provided, when the filter cartridge becomes dirty, The container can be used continuously and only the filter cartridge can be replaced. In this case, most of the filter cartridge is made of paper or resin fiber, which makes disposal very easy. Moreover, since the container is used as it is, the cost associated with replacement can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of an exchangeable filter cartridge in a filter device according to the present invention and FIG.
It is the figure which represented the A line part as a cross section from the front.

FIG. 2 is a diagram schematically showing a configuration example of a machining fluid circuit of a wire electric discharge machine in which the filter device of the present invention is used.

FIG. 3 is a perspective view of the replaceable filter cartridge of FIG. 1 taken along a plane perpendicular to an axis.

FIG. 4 is a cross-sectional view showing a container and an embodiment of a container in which a filter cartridge in the filter device of the present invention is housed, in plan view and in front view.

FIG. 5 is a cross-sectional view illustrating a mounting structure of the filter device of the present invention to a wire electric discharge machine.

6A and 6B are a front view and a plan view of the appearance of a conventional filter device.

[Explanation of symbols]

 10 Replaceable Filter Cartridge 11 Perforated Pipe 12, 13 Filter Material 14, 15, 42, 43 End Plates 14a, 15a, 42a, 43a Opening Holes 16, 17, 44, 45 Packing 40 Cylindrical Container 41 Cylindrical Member 46 Reinforcement band

Claims (2)

[Scope of utility model registration request] 1. A filter device for filtering foreign matter contained in a machining fluid of an electric discharge machine, comprising: a tubular member having a hole, and a first member detachably fixed to one axial end of the tubular member. End plate, and a cylindrical container having a second end plate fixedly attached to the other axial end of the tubular member, and a removable exchangeable filter cartridge housed inside the cylindrical container. A filter device for an electric discharge machine, comprising: 2. The exchangeable filter cartridge is provided with a perforated pipe provided in a central portion of a shaft for inflowing a processing liquid to be filtered, and a first filter coaxial with the perforated pipe and surrounding the perimeter thereof. Material, a second filter material that is coaxial with the first filter material and surrounds the first filter material, and two end plates that hermetically fix both axial ends of the first and second filter materials. The filter device for an electric discharge machine according to claim 1, wherein: