JP2001347425A - Work installing tool for electric discharge machining - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work installing tool capable of machining a work at once in a two-dimensional machining shape without rotatably fixing the work even when an external shape of the work fixed to an electric discharge machine and the machining shape are near. SOLUTION: Plural work installing members 37A and 37B different in the length can be placed on a table 31 of the electric discharge machine, and are set to a width for placing the tip of a fixing claw 47 and an obverse-reverse parallel thickness thinner than the work W. The work installing members are connected in a ring shape so as to surround the work W, and are press-fitted and held on two sides or one side forming an internal angle of the work installing members by fastening of a tap bolt 45.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixture for an electric discharge machining work, and more particularly to a fixture for attaching a work to be machined by a wire cut electric discharge machine to the machining machine.

[0002]

As shown in Prior Art FIG. 8, the workpiece W ₁ is electric discharge machining by wire-cut electric discharge machine is horizontally fixed to the cross table 1, always sent from the supply reel 2 with respect to the workpiece W ₁ copper is, the wire electrode 3 such as tungsten, is constructed such that the wound up the work W ₁ at the take-up reel 4 through a vertical state. Then, an anode voltage is supplied from the processing power source 5 to the work W ₁ , and a cathode voltage is applied to the wire electrode 3.

[0003] Therefore, the working fluid tank to the workpiece _{W 1} 6
When the insulating dielectric fluid 8 is injected by the pump 7 fromゝmonitor, the X-axis direction by the cross table 1 NC control servo motor drive, by moving each of the Y-axis direction, the workpiece W ₁ and the wire electrode Then, a discharge is performed between the two and the two-dimensional shape WF is processed in a thread sawing manner.

[0004] Here, the wire-cut electric discharge machine method of fixing the workpiece W ₁ against cross table 1 are those of various structures as shown below. First, the first conventional example, as shown in FIG. 9, when placing a portion of the circumference of each circular workpiece W ₂ to the two sides of the horizontal L-shaped table 1Aゝmonitor, an upper surface of the circumferential After the claw at the tip of the clamp 10 is placed on the
By tightening with a 1 screwed into tapped holes 12 provided on the table 1A, it is to fix the circular workpiece W ₂ to the machining area E enclosed by two sides of the table 1A. In the figure, WF is a machining shape of the two-dimensional proximate to the outer shape of the circular workpiece W _2.

A second conventional example is disclosed in Japanese Utility Model Application Laid-Open No.
As shown in FIG. 10 disclosed in JP-A-63244, each of the orthogonal side frames 13 of the frame-shaped main body 13 is provided.
A first reference plane 13A corresponding to the X direction and a second reference plane 13B corresponding to the Y direction are formed on the first and second reference planes 13A and 13B, and the third reference plane 14 corresponding to the Z direction is provided immediately below the two reference planes 13A and 13B. Each of the holding members 15 formed is provided detachably.

[0006] Each slot 13d, 13c facing each other with respect to each of the side frames 13a, 13b is inserted into each slot 1d.
7 and 16 are provided in the longitudinal direction, and a movable adjusting member 18 is provided in each of the long holes 17 and 16 so as to be fixed by an attaching member 19, and an operation screw 20 is screwed into the movable adjusting member 18. in, when the workpiece W ₃ being in contact with the outer peripheral surface thereof to said first reference surface 13A and the second reference surface 13Bゝmonitor, after horizontally held is placed on the third reference plane 14, the mounting member 19 in with the operating screw rod 20 of the fixed movable adjusting member 18 is advanced is to fix the workpiece W _3. In the figure, WF is a two-dimensional machining shape close to the outer shape of the workpiece W _3.

Further, as a third conventional example, Japanese Patent Laid-Open No.
As shown in FIG. 11, a work fixing jig 22 is inserted into a work processing area 23 at least at two places on a table 21 as shown in FIG. mounting in a state of, by close contact with the four corners of the surface of the workpiece W ₄ earlier part rear surface of the workpiece fixing jig 22, is connected via the fastener 24 and the workpiece W ₄ the work fixing jig 22 Structure. In the figure, WF
Is a two-dimensional machining shape close to the outer shape of the workpiece W _4.

[0008]

THE INVENTION Problems to be Solved] However, in the first conventional example shown in FIG. 9, when the two-dimensional machining shape WF is close to the outer periphery of the workpiece W _2, the table 1A
Fixed circumferential portion of the workpiece W _2, the wire electrode running in the vertical direction can not discharge machining by interference of said table 1A. Therefore, in this case, after the electric discharge machining of the machining shape WF of the workpiece W _2, except for the fixed circumferential portion rotates the workpiece W ₂ by releasing the fixing,
As that process the raw portion from the fixed to the end of machining parts again table 1A of the workpiece W _2, were processed in several. However, each time for rotating the workpiece W _2, must redo the settings parallel out or machining origin of the workpiece W _2, is not suitable for those high accuracy is required, a problem that it takes time to set-up was there.

[0009] In the second conventional example shown in FIG. 10, since the workpiece W ₃ is configured to place the holding member 15 of the reference surface 14 corresponding to the Z-direction, the machining shape WF is the work W _{In the} case where the workpiece W ₃ is close to the outer circumference, the electric discharge machining of the portion placed on the reference surface 14 of the work W ₃ becomes impossible as in the conventional example, so that the work W ₃ is rotated and fixed. There is a problem in that processing is performed separately. Also because the device has a structure for fixing a workpiece W ₃ is pressed against the reference surface 13A and the operation screw rod 20 from the diagonal side of the corner where the two reference surfaces of the reference plane 13B forms corresponding to the Y direction corresponding to the X-direction Although a circular or triangular work can be fixed securely, there is a drawback that in order to fix a rectangular work, an auxiliary tool that disperses the pressing force from the diagonal side to two sides is required. .

Furthermore, in the above third prior art example shown in FIG. 11, since the workpiece W ₄ is the structure via the fasteners 24 to secure the tip portion of the work fixing jig 22, a fastener 24 to the workpiece must drilled straight hole, when the workpiece W ₄ not provided these holes are not able to use the work fixture 22. Further, when the two-dimensional machining shape WF is close to the workpiece W ₄ periphery, said as in the conventional example, electric discharge machining of the partial metal stop 24 in the way is impossible.

[0011] Furthermore, the thickness of the workpiece W _4, the order of supplying the cathode voltage to the workpiece W _4, the workpiece W ₄ relative to the lower electrode was placed in contact with the lower surface of the workpiece W ₄ (cathode voltage) If the bottom surface of the increases, or when the lower reversed, since each has to be adjusted using the height adjusting spacer the height difference, the plurality adapted to the thickness of the workpiece W ₄ the adjustment spacer Must be aligned. Further, when the table 21 to fix the workpiece W ₄ to the wire-cut electric discharge machine of L-shaped, wherein it is not possible to attach the workpiece fixing jig 22 on all four corners of the work, the work well-balanced stably fix And other problems.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and the width of the work to be placed on the table and the fixing member have to be reduced because the outer shape of the work and the processing shape are close to each other. Even if the space for holding with the claw cannot be secured, the work can be processed at once without rotating, and the upper electrode can be processed without interference with the claw of the fixing member. It is an object of the present invention to provide a device capable of high-speed electric discharge machining by configuring the voltage supply electrode of the present invention so as to be always in close contact with the work.

[0013]

In order to achieve the above object, a first invention of the present application is directed to a method in which a rectangular plate is formed in a plan view, and two circular holes formed on one end side are overlapped with each other. An intermediate plate having a circular hole on one end side and a work holding bolt screwed on a side surface is integrally fixed by sandwiching the intermediate plate so that the circular holes are opposite to each other. A work attachment member is appropriately combined, and a connection pin is inserted into the overlapped circular hole of each of the adjacent work attachment members and connected in a chain shape. A work on which the tip of the fixing claw can be placed and a thickness which is thinner than the work and which is parallel to the front and back, respectively, and which is installed in the fixture so as to have the same bottom surface as the bottom surface thereof, are tightened by tightening the work holding bolts. Adjust the inner angle of the fixture. A second aspect of the present invention relates to the first aspect of the present invention, wherein the workpiece mounting member is connected to the workpiece mounting member in a plan view. 2. The mounting device for an electric discharge machining work according to claim 1, wherein the hole has a semicircular shape, and the circular hole is formed in the center of the semicircular shape.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIGS. 1 to 5. In the drawings, reference numeral 31 denotes a table of a wire cut electric discharge machine, which is L-shaped in plan view. A plurality of female screws 33 with which fixing bolts 32 to be described later are screwed are provided in the surface of two orthogonal sides of the table 31 in the middle of the width direction along the longitudinal direction. At predetermined intervals. Reference numeral 34 denotes a processing area surrounded by two sides of the table 31. In the processing area 34, an anode electrode 35 for constantly supplying an anode voltage to a work W to be described later is provided.
The upper surface of the anode electrode 35 is set flush with the surface of the table 31.

Reference numeral 36 denotes a discharge wire cathode electrode which is located in the processing area 34 and runs vertically downward.
W is a workpiece having a predetermined thickness and a circular or rectangular shape, and its front and rear surfaces are polished in parallel. In the drawing, WF is a two-dimensional processing shape that is cut near the outer periphery of the work W.

Reference numerals 37A and 37B denote work attachment members having substantially the same shape for fixing the work W to the table 31. One of the work attachment members 37A has a longitudinal length longer than that of the other work attachment member 37B. It is set long. The two work attachments 37A and 37B are vertically
The upper plate 38 and the lower plate 39 are each composed of a single intermediate plate 40, and the upper plate 38 and the lower plate 39 are of the same shape and have a thin rectangular shape in plan view. , Both of which are at one end 38
a and 39a are formed in a semicircular shape, and the other end sides 38b and 39b are formed in a linear shape, respectively.
A circular hole 42 for inserting the connecting pin 41 is formed at the center of 9a.

The intermediate plate 40 has the same shape as the upper and lower plates 38 and 39 and has a rectangular shape in plan view, and the thickness thereof is formed larger than the thickness of the upper and lower plates 38 and 39. And a semicircular end 40a
Is formed with a circular hole 43 into which the connection pin 41 is inserted. Further, in the long work mounting member 37A, a screw hole 4 into which a holding bolt 44 is screwed between the circular hole 43 and the other end 40b is provided on the side surface of the intermediate plate 40.
5 are plural in the width direction of the intermediate plate 40 (3 in the drawing).
The short work attachment member 37B has a single screw hole 45 on the side surface of the intermediate plate 40.

The upper and lower two upper and lower plates 38 and 39 and one intermediate plate 40 are arranged in a cascade such that their semicircular ends 38a, 39a and 40a are located on opposite sides. Then, the two upper plates 3
An intermediate plate 40 is sandwiched between the lower plate 8 and the lower plate 39, and the three plates 38, 39, 40 are fixed by screws 46 and connected linearly. At the time of this connection,
The circular holes 42 of the upper plate 38 and the lower plate 39 are located coaxially, and the other linear end 40b of the intermediate plate 40 is connected to the circular holes 42 of the upper and lower plates 38, 39.
So that it is in front of. The connection pin 41
Are the upper and lower plates 3 of the work mounting members 37A and 37B.
When inserted into the circular holes 42 of 8, 39, the one whose lower end does not protrude from the back surface of the lower plate 39 is used.

Here, the work mounting members 37A, 37
The front and back surfaces of B are polished in parallel, and the thickness (height) thereof is set smaller than the thickness (height) of the work W. Also, the inner side surfaces of the work mounting members 37A and 37B are precisely finished perpendicularly to the front and back surfaces.
Further, the width H of the work mounting members 37A, 37B is formed to be large enough to be placed on the table 31 and to be able to lock a tip 47a of a fixing claw 47 described later.

Reference numeral 47 denotes a rectangular fixing claw having a predetermined thickness, and a stepped long hole 48 is formed at the center in the width direction of the fixing claw 47 along the longitudinal direction. The fixing bolt 32 is inserted therein, and the head thereof is locked. Further, the tip 47a of the fixing claw 47 that is in close contact with the surface of the work W is cut to have an eaves-shaped back surface, and is formed to be thin.
A support bolt 49 that is in contact with the front surface of the table 31 is adjustably screwed to the rear surface of the rear end portion of the fixing claw 47 in order to hold the table 7 horizontally.

Next, the operation of the embodiment shown in FIG. 1 will be described. First, in the case of a small circular work W, two long work mounting members 37A and three short work mounting members 37B are used. Use The two long work mounting members 37A are connected to one of the work mounting members 37A.
After inserting one end side 40a of the intermediate plate 40 of the other work mounting member 37A between the one end sides 38a, 39a of the upper and lower plates 38, 39 of A, and aligning the two circular holes 42, 43 coaxially, The connecting pins 41 are inserted into the circular holes 42 and 43 to connect them orthogonally.

Also, the three short work mounting members 37
B is between one end sides 38a, 39a of the upper and lower plates 38, 39 of one work attachment member 37B, and one end side 40a of the intermediate plate 40 of the other work attachment member 37B.
After inserting the two holes 42 and 43 coaxially,
The connection pins 41 are inserted into the circular holes 42 and 43 to connect the three work mounting members 37B in series. Then, one end side 38a of the upper and lower plates 38, 39 of the three work mounting members 37B on the left side in the drawing.
One end side 40a of the intermediate plate 40 of the work attachment member 37A in the vertical state in the figure is inserted between the 39a, and the connection pins 41 are inserted into the coaxially aligned circular holes 42, 43 and connected.

Further, one end sides 38a, 3a of the upper and lower plates 38, 39 of the work mounting member 37A in a horizontal state in the figure.
9a, one end 4 of the work attachment member 37B on the right side in the figure.
By inserting the connecting pin 41 into the coaxially aligned circular holes 42 and 43 and connecting the same to the modified pentagonal ring shape having a larger inner flat area than the circular work W. I do. Here, the work mounting member 37
Since the one end side 38a, 39a, 40a connecting A and 37B is formed in a semicircular shape, the work attachment members 37A or the work attachment members 37A and 37A are connected to each other.
When B is connected, it can be bent at an arbitrary angle.

Next, on a flat plate, a circular work W is set on the inner side surfaces of the two long work attachment members 37A, 37A connected in an orthogonal shape, and the outer peripheral surfaces thereof are brought into contact with each other. The holding bolt 44 screwed into the screw hole 45 of the short work attachment member 37B on the side is screwed, and the circular work W is connected at its tip to two long work attachment members 37A, 37A connected orthogonally. Crimp to the inside surface of As a result, the bottom surface of the work W is flush with the bottom surfaces of the work mounting members 37A and 37B.

Next, the ring-shaped mounting member holding the work W by crimping is mounted on a long work mounting member 37 perpendicular to the ring-shaped mounting member.
The back surfaces of A and 37A are placed on the front surfaces of two sides of the table 31 so that the work W fits in the processing area 34. After locking the distal end portions 47a of the fixing claws 47 at several places on the surface of the work mounting member 37A, the fixing bolts 32 inserted into the elongated holes 48 of the fixing claws 47 are connected to the table 31. And screwed into it.

Thus, the attachment is securely fixed to the surface of the table 31 via the work attachment members 37A, 37A. As a result, the bottom surface of the circular work W is flush with the surface of the table 31, and the top surface of the anode electrode 35 is flush with the surface of the table 31. Thus, the anode voltage can always be supplied to the work W by the anode electrode 35.

Therefore, the table 31 is moved in the X-axis direction,
When the wire W is moved in the axial direction and a discharge is generated between the wire cathode electrode 36 penetrating the work W and the work W, the work is performed along a two-dimensional processing shape WF in a thread sawing manner. Will be At this time, the two-dimensional machined shape WF is moved to the table 31 by the work attachment members 37A and 37B.
, The electric discharge machining of the two-dimensional machining shape WF can be performed at once without being interfered by the table 31. Further, since the surface of the circular work W is positioned higher than the surfaces of the work attachment members 37A and 37B, the work attachment members 37A and 37B.
The electric discharge machining is performed without interference by the fixing claws 47.

FIG. 6 shows a second embodiment of the fixture according to the present invention, wherein the outer diameter of the circular workpiece W is the first diameter.
In this case, the number of the work attachment members 37A and 37B to be used is increased to form a deformed pentagon, and the other points are the same as those of the first embodiment. This is the same as that of the embodiment.

FIG. 7 shows a third embodiment of the present invention, in which a square work W is fixed.
Using the long work mounting member 37A, the work W
Connect them into a square with a larger flat area. The work W is fixed at the tip of a push bolt 44 screwed into the screw hole 45 of two work attachment members 37A adjacent to each other, and the other points are the same as those of the above-described embodiment. . Note that the present invention is not limited to the wire cut electric discharge machine, but can be applied to other electric discharge machines.

[0030]

According to the present invention, since the fixture for an electric discharge machining work according to the present invention has the above-described structure, even if the two-dimensional machining shape of the work is close to the outer shape of the work, the machining of the work can be performed. The lower electrode that moves on the locus of the shape does not interfere with the table, and the upper electrode that moves in conjunction with the lower electrode does not interfere with the fixtures or fixing claws, and rotates the work. It is possible to perform processing in a single fixed state at a time without performing this, and to shorten the processing time while obtaining a highly accurate product.

Since the bottom surface of the work and the bottom surface of the fixture can be assembled on the same surface, the bottom surface of the work and the surface of the table necessarily have the same positional relationship, and the upper surface of the lower electrode is There is no gap between the bottom of the work and the work. Therefore, since the voltage can be supplied in a state of being in close contact at all times, high-speed processing can be performed without any trouble. In addition, by preparing a plurality of workpiece mounting members having different lengths, there is an effect that various types of workpieces having different sizes and shapes can be fixed.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of an electric discharge machine using a fixture according to the present invention.

FIG. 2 is a longitudinal sectional view of a main part of the electric discharge machine.

FIG. 3 is a perspective view of a work mounting member.

FIG. 4 is a plan view showing a connection state of a work mounting member.

FIG. 5 is a sectional view taken along line II-II of FIG.

FIG. 6 is an example of use of another embodiment of the fixture.

FIG. 7 is an example of use of still another embodiment of the fixture.

FIG. 8 is a schematic explanatory view of a wire cut electric discharge machine.

FIG. 9 is a plan view of a work fixing structure of a conventional electric discharge machine.

FIG. 10 is a plan view of another work fixing structure of the conventional electric discharge machine.

FIG. 11 is a plan view of still another work fixing structure of the conventional electric discharge machine.

[Explanation of symbols]

 31 Table 32 Fixing bolt 33 Screw hole 34 Processing area 35 Anode electrode 36 Cathode electrode 37A, 37B Work mounting member 38 Upper plate 39 Lower plate 40 Intermediate plate 41 Connecting pin 42, 43 Circular hole 47 Fixing claw W Work WF Two-dimensional Machining shape

Claims (2)

[Claims] 1. A rectangular shape in a plan view, a circular hole formed at one end side, a circular hole formed at one end side between two plates arranged vertically, and a work holding bolt is screwed on a side surface. The combined intermediate plates are appropriately combined with a plurality of workpiece attachment members having different lengths, which are integrally fixed by sandwiching the two circular holes so that the two circular holes are on opposite sides, and the circles formed by overlapping the adjacent workpiece attachment members. A mounting tool comprising a connecting pin inserted into a hole and connected in a chain shape, wherein the mounting tool has a width which can be placed on a table and on which a tip of a fixing claw can be placed, and which is thinner than a work and which is thinner than a work. A configuration in which each of the workpieces has a thickness and is installed in the mounting fixture so as to have the same bottom face as the bottom face, and is pressed against two sides or opposite sides forming an inner angle of the mounting fixture by tightening a holding bolt of the workpiece. Characterized by Mounting tool for EDM work. 2. The mounting of a workpiece for electric discharge machining according to claim 1, wherein the workpiece mounting member has a semicircular shape in a plan view at both ends to be connected, and the circular hole is formed at the center thereof. Utensils.