US20120152906A1 - Wire electric discharge machining apparatus - Google Patents
Wire electric discharge machining apparatus Download PDFInfo
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- US20120152906A1 US20120152906A1 US13/404,224 US201213404224A US2012152906A1 US 20120152906 A1 US20120152906 A1 US 20120152906A1 US 201213404224 A US201213404224 A US 201213404224A US 2012152906 A1 US2012152906 A1 US 2012152906A1
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- 238000003754 machining Methods 0.000 title claims abstract description 24
- 239000000696 magnetic material Substances 0.000 claims description 9
- 239000012212 insulator Substances 0.000 abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 230000004907 flux Effects 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
- B23H7/08—Wire electrodes
- B23H7/10—Supporting, winding or electrical connection of wire-electrode
- B23H7/105—Wire guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
- B23H7/04—Apparatus for supplying current to working gap; Electric circuits specially adapted therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
- B23H7/08—Wire electrodes
- B23H7/10—Supporting, winding or electrical connection of wire-electrode
- B23H7/107—Current pickups
Definitions
- the present invention relates to a wire electric discharge machining apparatus that removes a part of a work piece by generating discharges between an electrode wire and the work piece.
- a coil is formed between any adjacent two of the cut wire portions by winding the electrode wire around a specific guide roller in a plurality of turns, whereby the insulation performance between the individual cut wire portions is improved by the impedance of each coil arranged therebetween, thereby suppressing a voltage impressed on a specific cut wire portion from being distributed to adjacent cut wire portions.
- each coil is formed by winding the electrode wire around the specific guide roller in the plurality of turns, so many of magnetic fields generated by an electric current flowing through one coil pass the interiors of other coils.
- a mutual inductance formed by arbitrary two coils is very large, so all the coils become electromagnetically closely coupled with one another.
- high permeable magnetic materials such as iron, etc., are often used for the guide rollers, and the electrode wire as long as possible is used so that the resistance of the electrode wire is utilized so as to increase a direct current impedance.
- the number of turns of the electrode wire tends to be increased, so the electromagnetic coupling of the individual coils is strong.
- the present invention is intended to obviate the problems as referred to above, and has for its object to obtain a wire electric discharge machining apparatus which is capable of impressing voltages to individual cut wire portions independently thereby to cause discharges in a simultaneous and parallel manner.
- a wire electric discharge machining apparatus includes: a plurality of guide rollers that are arranged at intervals; one electrode wire that is wrapped around each of the plurality of guide rollers to form a plurality of cut wire portions spaced from one another between a pair of the guide rollers; a processing power supply that feeds electric power to the individual cut wire portions through a power feed element; and a high frequency insulator that has coils which are formed of the electrode wire wound around between adjacent ones of the cut wire portions, respectively, and cores which are made of a magnetic material so as to close magnetic circuits of the individual coils, respectively, and are magnetically insulated from one another.
- the power feed element is arranged between the individual cut wire portions and the individual coils, and the individual cut wire portions are insulated from one another by the individual coils in a high frequency manner.
- a magnetic field generated by each coil stays within a corresponding individual magnetic member, and hence does not induce an electromotive force in other coils.
- FIG. 1 is a perspective view showing essential portions of a wire electric discharge machining apparatus according to a first embodiment of the present invention.
- FIG. 2 is a perspective view showing a high frequency insulator of FIG. 1 .
- FIG. 3 is a perspective view showing a high frequency insulating element of FIG. 2 .
- FIG. 4 is a perspective view showing a high frequency insulating element in a wire electric discharge machining apparatus according to a second embodiment of the present invention.
- FIG. 5 is a perspective view showing a high frequency insulator in the wire electric discharge machining apparatus according to the second embodiment of the present invention.
- FIG. 6 is a perspective view showing a high frequency insulating element in a wire electric discharge machining apparatus according to a third embodiment of the present invention.
- FIG. 7 is a perspective view showing a high frequency insulator in the wire electric discharge machining apparatus according to the third embodiment of the present invention.
- FIG. 1 is a perspective view that shows essential portions of a wire electric discharge machining apparatus according to a first embodiment of the present invention.
- FIG. 2 is a perspective view that shows a high frequency insulator 4 of FIG. 1 .
- FIG. 3 is a perspective view that shows a high frequency insulating element 41 of FIG. 2 .
- first guide roller 3 a a first guide roller 3 a , a second guide roller 3 b , a third guide roller 3 c , a fourth guide roller 3 d , a fifth guide roller 3 e , and a sixth guide roller 3 f , around which one electrode wire 2 being drawn out from a wire bobbin 1 is wrapped in a sequential manner, and which are spaced from one another in parallel in an axial direction.
- Those portions of the electrode wire 2 which are arranged between the first guide roller 3 a and the second guide roller 3 b constitute a plurality of cut wire portions 2 a that are arranged under tension in parallel with respect to one another.
- a work piece 8 of a hexahedral shape made of, for example, a silicon having electric conductivity is held at an appropriate length of a discharge gap by means of a position control system (not shown). Similar to an ordinary wire electric discharge machining apparatus, a working fluid is supplied to between this work piece 8 and the cut wire portions 2 a by means of spraying or dipping.
- Power feed units 71 are in contact with a plurality of wire portions 2 b , respectively, of the electrode wire 2 , which are arranged under tension in parallel to one another between the second guide roller 3 b and the third guide roller 3 c .
- the individual power feed units 71 are connected to processing power supply units 61 , respectively, that impress voltages to the individual cut wire portions 2 a through the wire portions 2 b .
- the individual power feed units 71 are closely located to one another while being insulated from one another to constitute a power feed element 7 .
- the individual processing power supply units 61 are constructed such that they can independently impress voltages to the individual cut wire portions 2 a through the individual power feed units 71 , respectively, and have a common ground, thus constituting a processing power supply 6 as a whole. Since the voltages are of course impressed between the individual cut wire portions 2 a and the work piece 8 , the common ground of the processing power supply 6 is connected to the work piece 8 .
- Wire portions 2 c of the electrode wire 2 between the fifth guide roller 3 e and the sixth guide roller 3 f are wound around wheels 41 b in a plurality of turns thereby to form coils 21 .
- the wheels 41 b are freely rotatable with respect to support rods 41 c of ring-shaped cores 41 a , respectively, which are made of a magnetic material of high permeability such as soft iron, ferrite, etc., so that they are caused to rotate in accordance with the travel of the electrode wire 2 .
- An arrow in FIG. 3 indicates the direction of travel of the electrode wire 2 and the direction of rotation of each wheel 41 b according to the travel of the electrode wire 2 .
- each wheel 41 b may have a groove formed on its outer peripheral surface along the path of the electrode wire 2 to be wrapped. With the formation of such grooves, the wire portions 2 c forming the coils 21 are prevented from slipping sideways, so it is possible to prevent the function of the coils 21 from being reduced due to the conduction of adjacent wire portions 2 c.
- the coils 21 , the cores 41 a and the wheels 41 b together constitute high frequency insulating elements 41 which can achieve high frequency insulation between the individual cut wire portions 2 b with a simple construction.
- the high frequency insulating elements 41 are arranged in parallel with respect to one another with air being interposed between adjacent high frequency insulating elements 41 , thereby constituting a high frequency insulator 4 .
- a non-magnetic material such as aluminum may be interposed therebetween.
- the power feed element 7 is arranged between the high frequency insulator 4 and the individual cut wire portions 2 a .
- the polarity of voltage impression can of course be properly inverted as required, as in conventional wire electric discharge machining.
- the one electrode wire 2 drawn out from the wire bobbin 1 after having traveled the first guide roller 3 a , the second guide roller 3 b , the third guide roller 3 c , the fourth guide roller 3 d and the fifth guide roller 3 e in this order, passes the first guide roller 3 a again through the sixth guide roller 3 f while rotating the wheels 41 b of the high frequency insulating elements 41 arranged at the leftmost in FIG. 1 .
- the one electrode wire 2 drawn out from the wire bobbin 1 repeatedly travels through the first guide roller 3 a , the second guide roller 3 b , the third guide roller 3 c , the fourth guide roller 3 d , the fifth guide roller 3 e , and the sixth guide roller 3 f , whereby the plurality of the cut wire portions 2 a and the plurality of the coils 21 are formed during the travel of the electrode wire, which is finally discharged from the discharge roller 5 .
- the work piece 8 is caused to descend so as to approach the cut wire portions 2 a , and at the same time, electric power is fed from the processing power supply 6 to the cut wire portions 2 a through the power feed element 7 , so that a pulse voltage of 10 kHz or more for instance is impressed between the cut wire portions 2 a and the work piece 8 , and a lot of fragments are cut from the work piece 8 .
- the electrode wire 2 forms the coils, so it has a large self inductance. Accordingly, the high frequency voltage impressed by the processing power supply 6 is remarkably attenuated at locations away from the coils 21 . That is, the high frequency voltage is attenuated remarkably in the sixth guide roller 3 f as compared with the fifth guide roller 3 e.
- each core 41 a made of a magnetic material is of a ring-shaped configuration in which the core 41 a passes through the interior of a corresponding coil 21 with its opposite ends being connected with each other in the outside thereof.
- the magnetic circuit of the coil 21 is closed.
- each core 41 a is separated or insulated from adjacent cores 41 a of other adjacent high frequency insulating elements 41 by air in the form of a non-magnetic material, so the magnetic circuits of the individual high frequency insulating elements 41 are separated from one another. Accordingly, the magnetic fluxes generated by currents flowing through the individual coils 21 are all confined in the interiors of the cores 41 a of the individual high frequency insulating elements 41 , respectively, and do not leak to the surroundings. As a result, the mutual inductance between any arbitrary two coils 41 a is very small. That is, there will be no interactions such as one in which a magnetic flux generated by a current flowing through each coil 21 influences on the other coils 21 thereby to generate electromotive forces therein.
- a high frequency insulating element 41 having an intermediate coil 21 is arranged each time the electrode wire 2 is wrapped between a plurality of guide rollers 3 a through 3 f , and by closing the magnetic circuit of each coil 21 with a ring-shaped core 41 a , the individual cut wire portions 2 a become connected to one another through the coils 21 of which the self inductance is large and the mutual inductance is small. Accordingly, the individual cut wire portions 2 a are insulated from one another in a high frequency manner, so high frequency voltages can be independently impressed from mutually different processing power supply units 61 , thus making it possible to generate simultaneous and parallel discharges.
- the ring-shaped cores 41 a in the above-mentioned embodiment there may be adopted a core comprising a plurality of core portions that can be divided or separated, so as to improve workability in winding the electrode wire 2 around the support rods 41 c .
- a core comprising a plurality of core portions that can be divided or separated, so as to improve workability in winding the electrode wire 2 around the support rods 41 c .
- the wheels 41 b in the above-mentioned embodiment do not have a function to confine the magnetic fields generated in the coils 21 . Accordingly, by making the wire 2 travel smoothly, though not an indispensable component element in the high frequency insulator 4 , there is an advantageous effect that a break or disconnection is prevented.
- the work piece 8 may be disposed below them so that those portions of the wire existing between the third guide roller 3 c and the fourth guide roller 3 d are made the cut wire portions 2 a .
- various forms of arrangement relations of the work piece 8 with respect to the electrode wire 2 can be considered such as one in which the work piece 8 is arranged at a side so that the wire portions 2 b between the second guide roller 3 b and the third guide roller 3 c is made the cut wire portions 2 a , but it is of course needless to say that any form may be adopted as long as the work piece 8 can be arranged in opposition to the electrode wire 2 of which a lot of wire portions are disposed in parallel to one another.
- the high frequency insulating elements 41 are not limited to such a configuration as shown in FIG. 3 , but may take any shape as long as they are formed of a magnetic material with a configuration that closes the magnetic circuits of the coils 21 .
- FIG. 4 is a perspective view that shows a high frequency insulating element 41 built in a wire electric discharge machining apparatus according to a second embodiment of the present invention.
- a core 41 a is of a disc shape that has a tunnel-shaped hole 41 d formed partially of an outer peripheral portion thereof along its edge, and a coil 21 is constructed by winding an electrode wire 2 around the outer peripheral portion while passing through the hole 41 d.
- the coil 21 is arranged on the outer periphery of the core 41 a . Accordingly, in case where high frequency insulating elements 41 are arranged in parallel to one another, as shown in FIG. 5 , it is possible to reduce the dimensions of a high frequency insulator 4 in a direction of arrangement thereof in comparison with the one of the first embodiment.
- this third embodiment other than the above is the same as that of the wire electric discharge machining apparatus according to the first embodiment.
- wire portions 2 c forming the coils 21 can be prevented from slipping sideways. As a result, it is possible to prevent reduction in the function of the coils 21 due to the conduction of adjacent wire portions 2 c.
- FIG. 6 is a perspective view that shows a high frequency insulating element 41 in a wire electric discharge machining apparatus according to a third embodiment of the present invention.
- a core 41 a has a through hole 41 e formed in the center thereof so as to penetrate therethrough in an axial direction.
- a high frequency insulator 4 has a plurality of cores 41 a arranged in parallel to one another, and a fixed shaft 80 of a non-magnetic material penetrates through the individual through holes 41 e thereby to fixedly secure the individual cores 41 a thereto.
- a balancing force to the tension of the electrode wire 2 can be made to act in a direction to compress the cores 41 a . Accordingly, there is obtained an advantage that the cores 41 a , even if made of a hard brittle material such as ferrite, are not easy to be destroyed.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
A wire electric discharge machining apparatus includes guide rollers and a single electrode wire that is wrapped around each of the guide rollers to form cut wire portions that are spaced from one another between pairs of the guide rollers. A processing power supply feeds electric power to the individual cut wire portions through a power feed element. A high frequency insulator includes wound coils of the electrode wire that are located between adjacent cut wire portions, and cores which close respective magnetic circuits of the individual coils. The magnetic circuits are magnetically insulated from one another. The power feed element is arranged between the individual cut wire portions and the individual coils, and the individual cut wire portions are insulated from one another at high frequencies by the individual coils. Voltages are impressed on the individual cut wire portions independently, so discharges can be generated simultaneously, in parallel.
Description
- The present invention relates to a wire electric discharge machining apparatus that removes a part of a work piece by generating discharges between an electrode wire and the work piece.
- There has been proposed a scheme in which when a thin plate is sliced from a column-shaped member by means of wire electric discharge machining, an electrode wire is wrapped around a plurality of guide rollers which are spaced apart from one another to form a multitude of spaced-apart cut wire portions, and electric power is separately supplied to the individual cut portions to cause discharges at the same time for improved productivity (for example, a first patent document).
- In this case, though all the cut wire portions become conductive with respect to one another, a coil is formed between any adjacent two of the cut wire portions by winding the electrode wire around a specific guide roller in a plurality of turns, whereby the insulation performance between the individual cut wire portions is improved by the impedance of each coil arranged therebetween, thereby suppressing a voltage impressed on a specific cut wire portion from being distributed to adjacent cut wire portions.
- First Patent Document: Japanese patent application laid-open No. 2000-94221
- In such a wire electric discharge machining apparatus, however, each coil is formed by winding the electrode wire around the specific guide roller in the plurality of turns, so many of magnetic fields generated by an electric current flowing through one coil pass the interiors of other coils. In other words, in such a construction, a mutual inductance formed by arbitrary two coils is very large, so all the coils become electromagnetically closely coupled with one another. In addition, high permeable magnetic materials such as iron, etc., are often used for the guide rollers, and the electrode wire as long as possible is used so that the resistance of the electrode wire is utilized so as to increase a direct current impedance. As a result, the number of turns of the electrode wire tends to be increased, so the electromagnetic coupling of the individual coils is strong.
- Accordingly, when a discharge is generated in one cut wire portion to cause a voltage variation, its influence is greatly exerted on all the cut wire portions. Thus, there arises a problem that it is in actuality very difficult to feed electric power to the individual cut wires separately or independently.
- The present invention is intended to obviate the problems as referred to above, and has for its object to obtain a wire electric discharge machining apparatus which is capable of impressing voltages to individual cut wire portions independently thereby to cause discharges in a simultaneous and parallel manner.
- A wire electric discharge machining apparatus according to the present invention includes: a plurality of guide rollers that are arranged at intervals; one electrode wire that is wrapped around each of the plurality of guide rollers to form a plurality of cut wire portions spaced from one another between a pair of the guide rollers; a processing power supply that feeds electric power to the individual cut wire portions through a power feed element; and a high frequency insulator that has coils which are formed of the electrode wire wound around between adjacent ones of the cut wire portions, respectively, and cores which are made of a magnetic material so as to close magnetic circuits of the individual coils, respectively, and are magnetically insulated from one another. The power feed element is arranged between the individual cut wire portions and the individual coils, and the individual cut wire portions are insulated from one another by the individual coils in a high frequency manner.
- According to a wire electric discharge machining apparatus of the present invention, a magnetic field generated by each coil stays within a corresponding individual magnetic member, and hence does not induce an electromotive force in other coils. As a result, it becomes possible to impress voltages to the individual cut wire portions in an independent manner, so discharges can be generated in a simultaneous and parallel manner.
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FIG. 1 is a perspective view showing essential portions of a wire electric discharge machining apparatus according to a first embodiment of the present invention. -
FIG. 2 is a perspective view showing a high frequency insulator ofFIG. 1 . -
FIG. 3 is a perspective view showing a high frequency insulating element ofFIG. 2 . -
FIG. 4 is a perspective view showing a high frequency insulating element in a wire electric discharge machining apparatus according to a second embodiment of the present invention. -
FIG. 5 is a perspective view showing a high frequency insulator in the wire electric discharge machining apparatus according to the second embodiment of the present invention. -
FIG. 6 is a perspective view showing a high frequency insulating element in a wire electric discharge machining apparatus according to a third embodiment of the present invention. -
FIG. 7 is a perspective view showing a high frequency insulator in the wire electric discharge machining apparatus according to the third embodiment of the present invention. - Now, preferred embodiments of the present invention will be described in detail while referring to the accompanying drawings. Throughout respective figures, the same or corresponding members or parts are identified by the same reference numerals and characters.
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FIG. 1 is a perspective view that shows essential portions of a wire electric discharge machining apparatus according to a first embodiment of the present invention.FIG. 2 is a perspective view that shows ahigh frequency insulator 4 ofFIG. 1 .FIG. 3 is a perspective view that shows a high frequencyinsulating element 41 ofFIG. 2 . - In this wire electric discharge machining apparatus, there are arranged a first guide roller 3 a, a second guide roller 3 b, a third guide roller 3 c, a fourth guide roller 3 d, a fifth guide roller 3 e, and a sixth guide roller 3 f, around which one
electrode wire 2 being drawn out from awire bobbin 1 is wrapped in a sequential manner, and which are spaced from one another in parallel in an axial direction. - Those portions of the
electrode wire 2 which are arranged between the first guide roller 3 a and the second guide roller 3 b constitute a plurality ofcut wire portions 2 a that are arranged under tension in parallel with respect to one another. Above thecut wire portions 2 a, awork piece 8 of a hexahedral shape made of, for example, a silicon having electric conductivity is held at an appropriate length of a discharge gap by means of a position control system (not shown). Similar to an ordinary wire electric discharge machining apparatus, a working fluid is supplied to between thiswork piece 8 and thecut wire portions 2 a by means of spraying or dipping. - Power feed units 71 are in contact with a plurality of
wire portions 2 b, respectively, of theelectrode wire 2, which are arranged under tension in parallel to one another between the second guide roller 3 b and the third guide roller 3 c. The individual power feed units 71 are connected to processing power supply units 61, respectively, that impress voltages to the individualcut wire portions 2 a through thewire portions 2 b. The individual power feed units 71 are closely located to one another while being insulated from one another to constitute apower feed element 7. The individual processing power supply units 61 are constructed such that they can independently impress voltages to the individualcut wire portions 2 a through the individual power feed units 71, respectively, and have a common ground, thus constituting aprocessing power supply 6 as a whole. Since the voltages are of course impressed between the individualcut wire portions 2 a and thework piece 8, the common ground of theprocessing power supply 6 is connected to thework piece 8. -
Wire portions 2 c of theelectrode wire 2 between the fifth guide roller 3 e and the sixth guide roller 3 f are wound aroundwheels 41 b in a plurality of turns thereby to formcoils 21. Thewheels 41 b are freely rotatable with respect to supportrods 41 c of ring-shaped cores 41 a, respectively, which are made of a magnetic material of high permeability such as soft iron, ferrite, etc., so that they are caused to rotate in accordance with the travel of theelectrode wire 2. An arrow inFIG. 3 indicates the direction of travel of theelectrode wire 2 and the direction of rotation of eachwheel 41 b according to the travel of theelectrode wire 2. With the use of thewheels 41 b, the travel of theelectrode wire 2 is made smoother, so a break or disconnection of theelectrode wire 2 is prevented. - Here, note that each
wheel 41 b may have a groove formed on its outer peripheral surface along the path of theelectrode wire 2 to be wrapped. With the formation of such grooves, thewire portions 2 c forming thecoils 21 are prevented from slipping sideways, so it is possible to prevent the function of thecoils 21 from being reduced due to the conduction ofadjacent wire portions 2 c. - Here, the
coils 21, thecores 41 a and thewheels 41 b together constitute highfrequency insulating elements 41 which can achieve high frequency insulation between the individualcut wire portions 2 b with a simple construction. The highfrequency insulating elements 41 are arranged in parallel with respect to one another with air being interposed between adjacent highfrequency insulating elements 41, thereby constituting ahigh frequency insulator 4. Incidentally, in order to magnetically insulate between adjacent highfrequency insulating elements 41 with respect to one another, a non-magnetic material such as aluminum may be interposed therebetween. - Here, note that it is of course necessary to independently impress high frequency voltages from the individual processing power supply units 61 to the individual
cut wire portions 2 a, so thepower feed element 7 is arranged between thehigh frequency insulator 4 and the individualcut wire portions 2 a. Moreover, the polarity of voltage impression can of course be properly inverted as required, as in conventional wire electric discharge machining. - Next, the operation of the wire electric discharge machining apparatus as constructed above will be described below.
- The one
electrode wire 2 drawn out from thewire bobbin 1, after having traveled the first guide roller 3 a, the second guide roller 3 b, the third guide roller 3 c, the fourth guide roller 3 d and the fifth guide roller 3 e in this order, passes the first guide roller 3 a again through the sixth guide roller 3 f while rotating thewheels 41 b of the highfrequency insulating elements 41 arranged at the leftmost inFIG. 1 . - Thus, the one
electrode wire 2 drawn out from thewire bobbin 1 repeatedly travels through the first guide roller 3 a, the second guide roller 3 b, the third guide roller 3 c, the fourth guide roller 3 d, the fifth guide roller 3 e, and the sixth guide roller 3 f, whereby the plurality of thecut wire portions 2 a and the plurality of thecoils 21 are formed during the travel of the electrode wire, which is finally discharged from thedischarge roller 5. - Under such a condition, the
work piece 8 is caused to descend so as to approach thecut wire portions 2 a, and at the same time, electric power is fed from theprocessing power supply 6 to thecut wire portions 2 a through thepower feed element 7, so that a pulse voltage of 10 kHz or more for instance is impressed between thecut wire portions 2 a and thework piece 8, and a lot of fragments are cut from thework piece 8. - As described in the foregoing, according to the wire electric discharge machining apparatus of the above-mentioned construction, the
electrode wire 2 forms the coils, so it has a large self inductance. Accordingly, the high frequency voltage impressed by theprocessing power supply 6 is remarkably attenuated at locations away from thecoils 21. That is, the high frequency voltage is attenuated remarkably in the sixth guide roller 3 f as compared with the fifth guide roller 3 e. - In addition, each
core 41 a made of a magnetic material is of a ring-shaped configuration in which thecore 41 a passes through the interior of acorresponding coil 21 with its opposite ends being connected with each other in the outside thereof. Thus, the magnetic circuit of thecoil 21 is closed. - Further, each
core 41 a is separated or insulated fromadjacent cores 41 a of other adjacent highfrequency insulating elements 41 by air in the form of a non-magnetic material, so the magnetic circuits of the individual highfrequency insulating elements 41 are separated from one another. Accordingly, the magnetic fluxes generated by currents flowing through theindividual coils 21 are all confined in the interiors of thecores 41 a of the individual highfrequency insulating elements 41, respectively, and do not leak to the surroundings. As a result, the mutual inductance between any arbitrary twocoils 41 a is very small. That is, there will be no interactions such as one in which a magnetic flux generated by a current flowing through eachcoil 21 influences on theother coils 21 thereby to generate electromotive forces therein. - Thus, a high
frequency insulating element 41 having anintermediate coil 21 is arranged each time theelectrode wire 2 is wrapped between a plurality of guide rollers 3 a through 3 f, and by closing the magnetic circuit of eachcoil 21 with a ring-shapedcore 41 a, the individualcut wire portions 2 a become connected to one another through thecoils 21 of which the self inductance is large and the mutual inductance is small. Accordingly, the individualcut wire portions 2 a are insulated from one another in a high frequency manner, so high frequency voltages can be independently impressed from mutually different processing power supply units 61, thus making it possible to generate simultaneous and parallel discharges. - Here, note that as the ring-shaped
cores 41 a in the above-mentioned embodiment, there may be adopted a core comprising a plurality of core portions that can be divided or separated, so as to improve workability in winding theelectrode wire 2 around thesupport rods 41 c. In this case, it is needless to say that even if there exist fine gaps between the core portions, there is no problem for use as long as magnetic fluxes do not substantially leak to the outside. - In addition, the
wheels 41 b in the above-mentioned embodiment do not have a function to confine the magnetic fields generated in thecoils 21. Accordingly, by making thewire 2 travel smoothly, though not an indispensable component element in thehigh frequency insulator 4, there is an advantageous effect that a break or disconnection is prevented. - Still further, although in the above-mentioned embodiment, there has been illustrated an example in which the
work piece 8 is arranged above the guide rollers 3 a through 3 f, thework piece 8 may be disposed below them so that those portions of the wire existing between the third guide roller 3 c and the fourth guide roller 3 d are made thecut wire portions 2 a. In addition, various forms of arrangement relations of thework piece 8 with respect to theelectrode wire 2 can be considered such as one in which thework piece 8 is arranged at a side so that thewire portions 2 b between the second guide roller 3 b and the third guide roller 3 c is made thecut wire portions 2 a, but it is of course needless to say that any form may be adopted as long as thework piece 8 can be arranged in opposition to theelectrode wire 2 of which a lot of wire portions are disposed in parallel to one another. - The high
frequency insulating elements 41 are not limited to such a configuration as shown inFIG. 3 , but may take any shape as long as they are formed of a magnetic material with a configuration that closes the magnetic circuits of thecoils 21. -
FIG. 4 is a perspective view that shows a highfrequency insulating element 41 built in a wire electric discharge machining apparatus according to a second embodiment of the present invention. - In this case, a core 41 a is of a disc shape that has a tunnel-shaped
hole 41 d formed partially of an outer peripheral portion thereof along its edge, and acoil 21 is constructed by winding anelectrode wire 2 around the outer peripheral portion while passing through thehole 41 d. - According to this high
frequency insulating element 41, thecoil 21 is arranged on the outer periphery of the core 41 a. Accordingly, in case where highfrequency insulating elements 41 are arranged in parallel to one another, as shown inFIG. 5 , it is possible to reduce the dimensions of ahigh frequency insulator 4 in a direction of arrangement thereof in comparison with the one of the first embodiment. - Here, note that the construction of this third embodiment other than the above is the same as that of the wire electric discharge machining apparatus according to the first embodiment.
- Also, in this case, if free wheels being rotatable with respect to
cores 41 a are arranged between thecores 41 a and coils 21, as in the first embodiment, the travel of theelectrode wire 2 becomes smoother, thus making it possible to prevent a break or disconnection thereof. - In addition, if a groove is formed on the outer peripheral surface of each wheel along the path of the
electrode wire 2,wire portions 2 c forming thecoils 21 can be prevented from slipping sideways. As a result, it is possible to prevent reduction in the function of thecoils 21 due to the conduction ofadjacent wire portions 2 c. -
FIG. 6 is a perspective view that shows a highfrequency insulating element 41 in a wire electric discharge machining apparatus according to a third embodiment of the present invention. - In this case, a core 41 a has a through
hole 41 e formed in the center thereof so as to penetrate therethrough in an axial direction. As shown inFIG. 7 , ahigh frequency insulator 4 has a plurality ofcores 41 a arranged in parallel to one another, and a fixedshaft 80 of a non-magnetic material penetrates through the individual throughholes 41 e thereby to fixedly secure theindividual cores 41 a thereto. - According to this
high frequency insulator 4, a balancing force to the tension of theelectrode wire 2 can be made to act in a direction to compress thecores 41 a. Accordingly, there is obtained an advantage that thecores 41 a, even if made of a hard brittle material such as ferrite, are not easy to be destroyed.
Claims (3)
1-6. (canceled)
7. A wire electric discharge machining apparatus comprising:
a plurality of guide rollers that are arranged at intervals;
a single electrode wire that is serially wrapped around said plurality of guide rollers to form a plurality of individual cutting wire portions that are spaced from one another between adjacent pairs of said guide rollers;
a processing power supply including a power feed element that feeds electrical power to said cutting wire portions, individually;
a plurality of wound coils of said electrode wire, a respective one of said coils being located between each respective adjacent pair of said individual cutting wire portions, respectively; and
a plurality of cores of magnetic material, each core closing a respective magnetic circuit of each of said individual coils, each respective coil and core being magnetically insulated from the other coils and cores, whereby said individual cutting wire portions are electrically insulated from one another at high frequencies.
8. The wire electric discharge machining apparatus as set forth in claim 7 , wherein
each of said cores has a ring-shaped configuration including, as part of the ring-shaped configuration, a support rod, and
each of said coils of said electrode wire is wound around said support rod of a respective core.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/404,224 US20120152906A1 (en) | 2004-09-10 | 2012-02-24 | Wire electric discharge machining apparatus |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004264118A JP4629393B2 (en) | 2004-09-10 | 2004-09-10 | Wire electrical discharge machine |
JP2004-264118 | 2004-09-10 | ||
PCT/JP2005/015201 WO2006027946A1 (en) | 2004-09-10 | 2005-08-22 | Wire electric discharge apparatus |
US56987606A | 2006-12-01 | 2006-12-01 | |
US13/404,224 US20120152906A1 (en) | 2004-09-10 | 2012-02-24 | Wire electric discharge machining apparatus |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/015201 Continuation WO2006027946A1 (en) | 2004-09-10 | 2005-08-22 | Wire electric discharge apparatus |
US56987606A Continuation | 2004-09-10 | 2006-12-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120152906A1 true US20120152906A1 (en) | 2012-06-21 |
Family
ID=36036234
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/569,876 Expired - Fee Related US8188401B2 (en) | 2004-09-10 | 2005-08-22 | Wire electric discharge machining apparatus |
US13/404,224 Abandoned US20120152906A1 (en) | 2004-09-10 | 2012-02-24 | Wire electric discharge machining apparatus |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/569,876 Expired - Fee Related US8188401B2 (en) | 2004-09-10 | 2005-08-22 | Wire electric discharge machining apparatus |
Country Status (7)
Country | Link |
---|---|
US (2) | US8188401B2 (en) |
EP (1) | EP1792683B1 (en) |
JP (1) | JP4629393B2 (en) |
CN (1) | CN100551594C (en) |
NO (1) | NO20070362L (en) |
TW (1) | TWI281422B (en) |
WO (1) | WO2006027946A1 (en) |
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US20130228553A1 (en) * | 2012-03-01 | 2013-09-05 | Kabushiki Kaisha Makino Huraisu Seisakusyo | Multi-wire electrical discharge machining system, multi-wire electrical discharge machining apparatus, power supply device, multi-wire electrical discharge machining method, semiconductor substrate, solar cell substrate, substrate manufacturing system, and substrate manufacturing method |
US9381587B2 (en) | 2013-04-15 | 2016-07-05 | Fanuc Corporation | Wire electric discharge machine which performs taper cutting |
US9707636B2 (en) | 2013-06-28 | 2017-07-18 | Canon Marketing Japan Kabushiki Kaisha | Wire electrical discharge machining apparatus, wire electrical discharge machining system, power supply apparatus, wire electrical discharge machining method, and method of manufacturing semiconductor substrate |
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Also Published As
Publication number | Publication date |
---|---|
JP2006075952A (en) | 2006-03-23 |
US8188401B2 (en) | 2012-05-29 |
NO20070362L (en) | 2007-04-10 |
TW200616743A (en) | 2006-06-01 |
US20090014420A1 (en) | 2009-01-15 |
EP1792683B1 (en) | 2012-05-30 |
CN1968780A (en) | 2007-05-23 |
EP1792683A4 (en) | 2010-08-18 |
EP1792683A1 (en) | 2007-06-06 |
WO2006027946A1 (en) | 2006-03-16 |
TWI281422B (en) | 2007-05-21 |
CN100551594C (en) | 2009-10-21 |
JP4629393B2 (en) | 2011-02-09 |
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