JP3587964B2 - Wire electric discharge machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wire electric discharge machine.
[0002]
[Prior art]
FIG. 7 shows a schematic structure of a conventional wire electric discharge machine. In FIG. 7, 1 is a wire electrode, 2 is a wire bobbin formed by winding the wire electrode 1, 3 is a drive motor for sending out the wire electrode 1 from the wire bobbin 2, 4 is a brake, 5 is connected to the brake 4, and tension is applied to the wire electrode 1. , 6 and 7 are first and second guide rollers for changing the running direction of the wire electrode 1, 8 and 9 are upper and lower wire guides 10 for slidably guiding the wire electrode 1 into the machining gap. Numerals 11 and 11 are upper and lower working fluid nozzles for ejecting the working fluid into the working gap.
[0003]
Reference numeral 12 denotes a workpiece to be processed, 13 denotes a surface plate on which the workpiece 12 is placed, 14 denotes a guide roller provided below the lower wire guide to change the traveling direction of the wire electrode 1, and 15 denotes a wire. This is a discharge voltage generator that constitutes a power source for electric discharge machining. Reference numeral 16 denotes a lower arm that holds the lower wire guide 9 and the lower working fluid nozzle 11, and 17 denotes a column that holds the upper wire guide 8, the upper working fluid nozzle 10, and the lower arm 16.
[0004]
Further, reference numerals 18 and 19 denote a pair of first and second pinch rollers mounted on the column 17, and reference numeral 20 drives the second pinch roller 19 to move the first pinch roller 18 between the first pinch roller 18 and the second pinch roller 19. A pinch roller drive motor, which is a pinch roller drive means for moving the wire electrode 1 sandwiched between the first and second pinch rollers 18 and 19, and a collection box for collecting the wire electrode 1 wound up by the first and second pinch rollers 18 and 19 It is.
[0005]
Next, the operation will be described. When processing the workpiece 12, the wire electrode 1 is continuously supplied from the wire bobbin 2 to the first and second pinch rollers 18, 19 through the brake roller 5, the upper wire guide 8, and the lower wire guide 9. You. On the other hand, the workpiece 12 attached to the surface plate 13 is relatively moved with respect to the wire electrode 1 by an XY cross table (not shown), and faces the wire electrode 1 via a minute gap. A working fluid (not shown) ejected from the upper and lower working fluid nozzles 10 and 11 is supplied to the minute gap.
[0006]
In this state, a voltage is applied between the wire electrode 1 and the workpiece 12 from the discharge voltage generating unit 15 between the wire electrode 1 and the workpiece 12 to cause a discharge explosion between the wire electrode 1 and the workpiece 12 via the machining fluid. As a result, a part of the workpiece 12 is skipped, and the electric discharge machining proceeds. Since the wire electrode 1 is supplied continuously, there is no disconnection, and the workpiece 12 is processed into a desired shape by moving the XY cross table in an arbitrary direction.
[0007]
[Problems to be solved by the invention]
Since the conventional wire electric discharge machine is configured as described above, for example, as shown in FIG. 8, after electric discharge machining, the cut-off portion 12a of the workpiece 12 falls, and the lower machining fluid nozzle 11 When the cut-off portion 12a is sandwiched between the workpieces 12 and the operator mistakenly moves the XY cross table in the direction in which the cut-off portion 12a is sandwiched, the machining liquid nozzle portion and the workpiece The object 12 is damaged. Therefore, the operator must carefully perform the work of removing the cut-off portion 12a, and there is a problem that the setup work takes time.
[0008]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can prevent breakage of a machining fluid nozzle portion and a workpiece by sandwiching a cut-off portion, and can improve a setup work. The purpose is to obtain.
[0009]
[Means for Solving the Problems]
To achieve the above object, a wire electrical discharge machining apparatus according to the present invention is to eject pressurized coating liquid between the wire electrode and the workpiece to generate electric discharge through the working fluid, the workpiece In a wire electric discharge machine that performs machining while moving in the XY axis direction, a lower machining fluid nozzle that is provided below the workpiece and ejects the machining fluid, and the machining fluid nozzle is provided outside the lower machining fluid nozzle. A contact detecting member which is insulated and fixed at a fixed interval, and is divided into at least four parts so as to be directed in the + X-axis direction, the −X-axis direction, the + Y-axis direction, and the −Y-axis direction, respectively; A contact detection unit that detects a contact between the workpiece and the divided contact detection member, and the contact of the workpiece is detected based on a result of the contact detection by the contact detection determination unit . The contact detection member It is intended to suppress the movement of the direction.
[0010]
A wire electric discharge machine according to the next invention is the wire electric discharge machine according to the above invention, wherein the contact detection member is divided into four or more by one of a conductive plate member and a conductive wire. Things.
[0011]
Wire electric discharge machining apparatus according to another feature of the present invention, the pressurized coating liquid was ejected from the wire electrode and the workpiece to generate electric discharge through the working fluid, while moving the workpiece in the XY axis direction processing in wire electric discharge machining apparatus, it said provided under the workpiece, and a lower working fluid nozzle for jetting the machining fluid is constituted by an electrically insulating material, deposition and adhesion before Symbol lower working fluid outer surface of the nozzle is secured either at one of respectively + X-axis direction, -X direction, + in order to SeiMuko the Y-axis direction and the -Y-axis direction, and disposed to divide at least four contact detecting electrode plate, wherein Contact detection means for detecting a contact between the workpiece and each of the divided contact detection electrode plates, wherein the contact of the workpiece is detected based on a result of the contact detection by the contact detection determination means. Said contact detection electrode It is intended to suppress the movement in the direction.
[0013]
A wire electric discharge machine according to the next invention is the wire electric discharge machine according to the above invention, wherein the contact detecting member is removably positioned and fixed to the lower machining liquid nozzle.
[0014]
The wire electric discharge machine according to the next invention is the wire electric discharge machine according to the above invention, wherein the contact detection member detects that the contact detection member is positioned and fixed at a regular position with respect to the lower machining liquid nozzle. A switching means for determining whether or not the contact detection member has been positioned and fixed at a regular position with respect to the lower processing liquid nozzle by the contact detection valid / invalid switching means; This enables contact detection.
[0015]
The wire electric discharge machine according to the next invention is the wire electric discharge machine according to the above invention, wherein the workpiece is moved in the XY-axis directions between an effective state and an invalid state which can be determined by an output signal of the contact detection valid / invalid switching means. The range is set to a different moving range.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a wire electric discharge machine according to the present invention will be described below in detail with reference to the accompanying drawings. In the embodiments of the present invention described below, portions having the same configurations as those of the above-described conventional example are denoted by the same reference numerals as those of the above-described conventional example, and description thereof will be omitted.
[0017]
Embodiment 1 FIG.
1 and 2 show a first embodiment of a wire electric discharge machine according to the present invention. A contact detection member 30 is disposed outside the working fluid nozzle 11 so as to surround the lower working fluid nozzle 11. The contact detection member 30 is made of a conductive material, and is supported by the lower arm 16 via the insulating member 31 in an electrically insulated state while keeping a fixed interval outside the lower working liquid nozzle 11.
[0018]
The contact detection member 30 has a + X-axis direction detection piece 30a facing in the + X-axis direction, a + Y-axis direction detection piece 30b in the + Y-axis direction, and a -X-axis direction. The X-axis direction detecting piece 30c and the -Y-axis direction detecting piece 30d that is oriented in the Y-axis direction are electrically divided, and each detection is performed by the contact detection determining means 32 by an individual conductor 33a to 33d. It is connected.
[0019]
The contact detection determination means 32 is grounded to the surface plate 13, and detects contact between the workpiece 12 made of a conductive material placed on the surface plate 13 by the continuity check and the above-described detection pieces 30 a to 30 d in the respective axial directions. (Determination) is individually performed for each of the above-described axial directions.
[0020]
Next, the operation of the first embodiment will be described. Since the method of electric discharge machining is the same as that shown in the conventional example, the description thereof will be omitted, and the operation after electric discharge machining will be particularly described.
[0021]
When removing the cut-off portion 12a of the workpiece 12 after the electric discharge machining, when the cut-off portion 12a is not in contact with the contact detection member 30, the XY cross table is moved to a place where the cut-off portion 12a is easily removed. To remove.
[0022]
As shown in FIG. 1, when the cut-off portion 12a falls and comes into contact with the contact detection member 30 while the XY cross table is being moved to a place where the cut-off portion 12a can be easily removed, for example, the + X-axis direction detection piece When contact is made with the contact 30a, the + X-axis direction detecting piece 30a becomes conductive with the surface plate 13, and this is detected by the contact detection determining means 32.
[0023]
By this detection, the contact detection determination means 32 displays on the control section (not shown) that the cut-off section 12a has contacted the + X-axis direction detecting piece 30a, and also moves the XY cross table in the contact axis direction (+ X-axis direction). Direction). Therefore, damage to the machining liquid nozzle portion and the workpiece 12 can be avoided, and the XY cross table can be moved to a location where the cut-off portion 12a can be easily removed, and the cut-off portion 12a can be removed.
[0024]
The number of divisions of the detection piece of the contact detection member 30 is not limited to four, and may be more if necessary. For example, eight pieces may be used to specify the contact portion in more detail. It is possible.
[0025]
Embodiment 2 FIG.
FIG. 3 shows a second embodiment of the wire electric discharge machine according to the present invention. In FIG. 3, the portions corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG.
[0026]
In this embodiment, a contact detection member 34 equivalent to the contact detection member 30 in the first embodiment is made of a conductive wire material, and includes a + X-axis direction detection unit 34a, a + Y-axis direction detection unit 34b, and -X Each of the axial direction detecting unit 34c and the −Y-axis direction detecting unit 34d is formed into a frame shape by bending the wire material several times, and is insulated and arranged outside the lower working fluid nozzle 11 at a constant interval.
[0027]
Also in this embodiment, when the cut-off portion 12a falls and comes into contact with the + X-axis direction detection portion 34a of the contact detection member 34, the + X-axis direction detection portion 34a is connected to the surface plate 13 as in the first embodiment. A conduction state is detected, and this is detected by the contact detection determination means 32. The contact detection determination means 32 displays on the control unit (not shown) that the cut-off unit 12a has contacted the + X-axis direction detection unit 34a. , X-Y cross table cannot be moved in the contact axis direction (+ X axis direction). Therefore, damage to the machining liquid nozzle portion and the workpiece 12 can be avoided, and the XY cross table can be moved to a location where the cut-off portion 12a can be easily removed, and the cut-off portion 12a can be removed.
[0028]
In addition, since each of the detection portions 34a to 34d of the contact detection member 34 is formed into a shape which is bent several times with a wire material, even if the large cut-off portion 12a falls and comes into contact, the effect that the impact can be absorbed can be obtained. Can be
[0029]
Embodiment 3 FIG.
FIG. 4 shows a third embodiment of the wire electric discharge machine according to the present invention. In FIG. 4, the portions corresponding to FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and description thereof will be omitted.
[0030]
In the present embodiment, the lower working fluid nozzle 11 is made of an electrically insulating material, and the outer surface of the lower working fluid nozzle 11 is provided with a contact detection device that is directed equally in each axial direction equally divided in the circumferential direction. Electrode plates 35a to 35d are deposited or bonded.
[0031]
Also in this embodiment, when the cut-off portion 12a falls and contacts, for example, the + X-axis direction contact detection electrode plate 35a, the + X-axis direction contact detection electrode plate 35a is connected to the surface plate 13 as in the first embodiment. The conduction state is detected, and this is detected by the contact detection determination means 32, and the contact detection determination means 32 indicates to the control unit (not shown) that the cut-off portion 12a has come into contact with the + X-axis direction contact detection electrode plate 35a. At the same time, control is performed so that the XY cross table cannot be moved in the contact axis direction (+ X axis direction). Therefore, damage to the machining liquid nozzle portion and the workpiece 12 can be avoided, and the XY cross table can be moved to a location where the cut-off portion 12a can be easily removed, and the cut-off portion 12a can be removed.
[0032]
In addition, since each of the contact detection electrode plates 35a to 35d is deposited or adhered to the outer surface of the lower processing liquid nozzle 11, an increase in the number of parts can be suppressed, and the detection portion can be reduced, and the XY axis direction can be reduced. The moving range can be set up to near the surface plate 13.
[0033]
Embodiment 4 FIG.
5 and 6 show a fourth embodiment of the wire electric discharge machine according to the present invention. In FIGS. 5 and 6, parts corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and description thereof is omitted.
[0034]
In this embodiment, an assembly of the contact detecting member 30 and the insulating member 31 is detachably fitted into an annular groove 11b formed in the base 11a of the lower working fluid nozzle 11, and is integrally formed with the insulating member 31. The projecting piece 31a is inserted into the engagement groove 11d from the entrance 11c enlarged outside the annular groove 11b of the base 11a, and the assembly is turned about 30 degrees counterclockwise as viewed in FIG. The projection 31a abuts against the inner wall 11e of the engagement groove 11d, whereby the contact detection member 30 is positioned and fixed at a regular position with the mounting direction being fixed. That is, the contact detection member 30 can be attached to and detached from the lower processing liquid nozzle 11 in a bayonet manner with one touch.
[0035]
At the bottom of the annular groove 11b of the base 11a, connection terminals 40a, 40b, 40c, and 40d of the conductors 33a to 33d are embedded in an electrically insulated state, and the contact detection member 30 is positioned and fixed at the above-described regular position. Accordingly, the connection terminals 40a to 40d are electrically connected to the detection pieces 30a to 30d in the respective axial directions.
[0036]
Contact detection valid / invalid switching terminals 41a and 41b are buried in the bottom of the engagement groove 11d in an electrically insulated state, the connection terminal 41c is buried in the protruding piece 31a, and the contact detection member 30 is formed as described above. By being positioned and fixed at the regular position, the connection terminal 41c electrically connects the contact detection valid / invalid switching terminals 41a and 41b, and the ON signal detects that the contact detection member 30 is positioned and fixed at the regular position. The determination unit 32 is notified.
[0037]
In this embodiment, the contact detection determining means 32 is provided only when an ON signal is given from the contact detection valid / invalid switching means 41 through the contact detection valid / invalid switching terminals 41a and 41b and the connection terminal 41c. This makes contact detection effective.
[0038]
Further, it is possible to set the moving range in the XY-axis direction of the XY cross table different between the valid state and the invalid state which can be determined by the output signal of the contact detection valid / invalid switching means 41. That is, in the valid state, the moving range of the XY cross table in the XY axis direction is set to the moving range in which the contact detection member 30 does not contact the surface plate 13, and in the invalid state, the XY cross table of the XY cross table is set. Can be extended to a movement range in which the lower processing liquid nozzle 11 does not contact the surface plate 13.
[0039]
In this embodiment, the contact detection member 30 is removed from the lower processing fluid nozzle 11 in order to process the workpiece 12 up to the vicinity of the surface plate 13 by shape processing in which the cut-off portion 12a of the workpiece 12 does not occur. Since the contact detection member 30 is detachably attached to the lower processing liquid nozzle 11 in a bayonet manner, the removal of the contact detection member 30 can be easily performed with one touch.
[0040]
When the contact detection member 30 is detached from the lower processing liquid nozzle 11, the output signal of the contact detection valid / invalid switching means 41 is switched to the off signal, and the moving range of the XY cross table in the XY axis direction is changed to the lower processing. The liquid nozzle 11 is automatically enlarged to a moving range in which the liquid nozzle 11 does not come into contact with the surface plate 13, so that the processing can be performed by expanding the moving range in the XY axis directions.
[0041]
【The invention's effect】
As understood from the above description, according to the wire electric discharge machine according to the present invention, when the contact of each of the divided contact detection members with the workpiece is detected by the contact detection determination means, the contact is detected. Since only the movement of the workpiece in the direction of the contact detection member is suppressed , the workpiece can be moved without interposing the cut-off portion without paying special attention, and the lower machining fluid can be moved. The nozzle portion and the workpiece can be prevented from being damaged, and there is no need for the operator to carefully move the workpiece in the X and Y directions when removing the cut-off portion of the workpiece, thereby improving the workability. Can be
[0042]
According to the wire electric discharge machine according to the next invention, since the contact detection member is divided into four or more by a conductive plate member or a conductive wire, each contact detection member is divided into a workpiece and a divided contact detection member. In particular, if the contact detecting member is formed of a wire, the effect of absorbing a shock can be obtained even if a large cut-off portion falls and comes into contact.
[0043]
According to the wire electric discharge machine according to the next invention, when the contact of each of the divided contact detection electrode plates with the workpiece is detected by the contact detection determining means, the movement of the workpiece in the XY axis direction is controlled. Therefore, it is possible to prevent breakage of the machining liquid nozzle portion and the workpiece, and it is not necessary for the operator to carefully move in the X and Y directions when performing the work of removing the cut-off portion of the workpiece, thereby improving the setup work. The effect is obtained. In addition, since each contact detection electrode plate is deposited or adhered on the outer surface of the lower processing liquid nozzle, increase in the number of parts can be suppressed, the detection portion can be reduced, and the movement range in the XY axis direction can be controlled with the surface plate. The effect of being able to set up to near is also obtained.
[0044]
According to the wire electric discharge machine according to the next invention, since the contact detecting member or the contact detecting electrode plate is divided and arranged so as to be positive in the + X-axis direction, the −X-axis direction, the + Y-axis direction, and the −Y-axis direction, An effect is obtained that the contact direction of the workpiece can be accurately determined in each coordinate direction.
[0045]
According to the wire electric discharge machine according to the next invention, the contact detection member is removably positioned and fixed to the machining liquid nozzle. Therefore, when the contact detection is unnecessary, the contact detection member is detached from the machining liquid nozzle and processed. The effect is obtained that the movable range of the object can be expanded.
[0046]
According to the wire electric discharge machine according to the next invention, the contact detection determining means is only used when the contact detection valid / invalid switching means detects that the contact detection member is positioned and fixed at a regular position with respect to the machining fluid nozzle. Erroneous detection can be avoided beforehand.
[0047]
According to the wire electric discharge machine according to the next invention, the moving range of the workpiece in the XY-axis direction is set to a different moving range between the valid state and the invalid state which can be determined by the output signal of the contact detection valid / invalid switching means. In each of the case where the contact detection member is attached to the machining liquid nozzle and the case where the contact detection member is detached, the movement range of the workpiece in the XY axis directions can be set to the allowable maximum value.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a lower wire guide portion in a wire electric discharge machine according to a first embodiment of the present invention.
FIG. 2 is a plan view showing a contact detection nozzle unit according to the first embodiment.
FIG. 3 is a sectional view showing a lower wire guide portion in a wire electric discharge machine according to a second embodiment of the present invention.
FIG. 4 is a sectional view showing a lower wire guide portion in a wire electric discharge machine according to a third embodiment of the present invention.
FIG. 5 is a sectional view showing a lower wire guide portion in a wire electric discharge machine according to a fourth embodiment of the present invention.
FIG. 6 is a plan view showing a contact detection nozzle unit according to a fourth embodiment.
FIG. 7 is a perspective view showing a schematic structure of a conventional wire electric discharge machine.
FIG. 8 is a sectional view showing a lower wire guide portion of a conventional wire electric discharge machine.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 wire electrode, 9 lower wire guide, 11 lower working fluid nozzle, 12 workpiece, 12 a cut-off portion, 13 base plate, 16 lower arm, 30 contact detecting member, 30 a to 30 d detecting member in each axial direction, 31 insulating member , 32 contact detection determination means, 33a-33d conducting wire, 34 contact detection member, 34a-34d detection unit in each axial direction, 35a-35d contact detection electrode plate in each axial direction, 40a-40d connection terminal, 41 contact detection effective / Invalid switching means, 41a, 41b Contact detection valid / invalid switching terminal, 41c Connection terminal.

Claims (6)

Spewing pressurized coating liquid between the wire electrode and the workpiece, the working fluid discharge is generated through, in the wire electric discharge machining apparatus for machining while moving the workpiece in the XY-axis direction,
A lower working fluid nozzle provided at a lower portion of the workpiece and ejecting the working fluid;
The lower machining fluid to the lower working fluid nozzle outside of the nozzle is insulated fixed keeping a constant distance, in order to SeiMuko respective + X-axis direction, -X direction, + Y-axis direction and the -Y-axis direction, at least four A contact detection member divided into
Having contact detection determination means for detecting the contact between the workpiece and the divided contact detection member,
A wire electric discharge machine wherein the movement of the workpiece in the direction of the contact detection member where the contact is detected is suppressed based on a result of the contact detection by the contact detection determining means. 2. The wire electric discharge machining apparatus according to claim 1, wherein the contact detecting member is divided into four or more by one of a conductive plate member and a conductive wire. Spewing pressurized coating liquid between the wire electrode and the workpiece, the working fluid discharge is generated through, in the wire electric discharge machining apparatus for machining while moving the workpiece in the XY-axis direction,
A lower working fluid nozzle provided at a lower portion of the workpiece and ejecting the working fluid;
Is composed of an electrically insulating material, it is fixed at either front Symbol lower working fluid deposition and adhesion to the outer surface of the nozzle, each + X-axis direction, -X direction, + Y-axis direction and the -Y-axis direction to the positive A contact detection electrode plate divided into at least four parts so as to face each other ;
Having contact detection determination means for detecting the contact between the workpiece and the divided contact detection electrode plate,
A wire electric discharge machine wherein a movement of the workpiece in a direction of the contact detection electrode plate where the contact is detected is suppressed based on a result of the contact detection by the contact detection determining means. 3. The wire electric discharge machine according to claim 1, wherein the contact detection member is detachably positioned and fixed to the lower machining fluid nozzle. A contact detection valid / invalid switching means for detecting that the contact detection member is positioned and fixed at a regular position with respect to the lower processing liquid nozzle; 5. The wire electric discharge machining according to claim 4 , wherein the contact detection by the contact detection determination unit is enabled only when it is detected that the lower working fluid nozzle is positioned and fixed at a regular position. 6. apparatus. 6. The wire according to claim 5 , wherein a moving range of the workpiece in the XY axis direction is set to a different moving range between an effective state and an invalid state which can be determined by an output signal of the contact detection valid / invalid switching means. Electric discharge machine.

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