JPH01127225A - Wire electric discharge machine - Google Patents

Abstract

PURPOSE:To automatically exchange a wire electrode of different wire size by moving a feed unit by a cylinder in a wire electrode supply route direction while mounting the feed unit to a slider provided in a supply route in its predetermined position. CONSTITUTION:In case of using a wire electrode 38a of about 0.2mm wire size, lifting a slider 152 to a position a by a motor 20 through a feed thread 18, a feed unit 150a is moved by an air cylinder 151a along a rail 155a, mounted to the slider 152 and clamped. Lowering the slider 152 and returning the cylinder 151a, supply action of the wire electrode 38a is performed. Next, in case of replacing the wire electrode with a wire electrode 38b of about 0.1mm size, lifting the slider 152, by alternately actuating air cylinders 151a, 151b, the feed unit 150a is released from its clamping, and a feed unit 150b is mounted to the slider 152. In this way, the wire electrode of different size can be automatically exchanged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a wire electrical discharge machining device that can automatically exchange wire electrodes with different wire diameters.

[Conventional technology - Tatami wire electrical discharge machining equipment has a wire electrode facing the workpiece through a minute gap, and generates a pulsed electric discharge between the workpiece and the continuously automatically supplied wire electrode. is generated repeatedly, and the workpiece is cut using the discharge energy generated at this time.

FIG. 5 is a configuration diagram showing an automatic wire electrode feeding mechanism in a conventional wire electric discharge machining apparatus disclosed in, for example, Japanese Patent Application Laid-Open No. 60-80528. 8) A freely movable XY cross table (placed on a table shown in the figure).

(12ri and (12h) are cutting machining start holes drilled in advance on the surface of the workpiece αQ. α4 is a kite supporting the wire electrode supply device, and the wire force... The main body of the device (not shown is fixed to a shaft movable in the moon ζ2 axis direction, that is, in the vertical direction. a8 is a slider that constitutes a part of the moving mechanism 0, and the guide α4 is
It is provided so that it can freely slide up and down along the The drive screw (to) is inserted into the slider αG, and
The upper end of the drive screw (to) is connected to the drive motor holder fixed to the top of the kite α4, and the slider (to) is moved by the drive screw (to) and the drive motor ■ to the kite α◆
automatically slides along the

A row mechanism 4 is provided on the slide αθ. The roller mechanism holder consists of a pair of wire electrode feeding booleans 9- (to) and a clamp pulley (to), and the rotating shaft of the wire feeding pulley (c) is facing the slider a and the wire electrode feeding Connected to the motor (to),
The wire battery feeding pulley is equipped with a reversal prevention mechanism. Furthermore, the clamp pulley (to) is connected to the pin (to).
A link is rotatably fixed to the slider through the tip.The tip of the link is rotatably supported, and the rear part of the link is connected to the slider αe via a coil spring. Due to the elastic force of (to), link (to)
The clamp pulley at the tip is always pressed against the periphery of the wire electrode feeding pulley. (to) constitutes a pipe chi F (for example, a pipe from 2 to 81 m long, and a moving mechanism α7 via a fitting) into which the wire electrode (to) can be inserted and supported. It is fixed to slider 〇G. A wire electrode (total) is slidably supported within the lower end of the pipe kite (total).
E-source guide is fitted. In addition, a predetermined city pressure is applied between the pipe kite (to) and the workpiece Ql, and when the pipe kite can and the workpiece QO come into contact, a signal force is output from the detector eυ, and this The signal causes the drive motor to stop, and the wire feed motor to drive, causing the wire electrode to be pulled out from the pipe kite can. A clamp mechanism capable of supporting and fixing the pipe guide C36 in a predetermined position is provided at the lower end of the kite α4. The clamping mechanism unit consists of a swivel plate (44aJ) with a V-groove cut and fixed to the lower part of the guide α4, and a swivel plate (44b) connected to the solenoid fixed to the guide α→. - When actuated, one lift plate (44b) separates from the other clamp plate (44) and the lift state is released, and the solenoid is returned to its original position. Due to the elastic force of the coil spring held between the clamp plate (441), one clamp plate (441) approaches the other clamp plate (44a7) and maintains the clamped state.

The clasp is a cutting mechanism that cuts the wire Wt winding (to) at a flat position and eliminates the cut remaining part of the wire electrode (to). On the inside of the two arms, which are attached to the rotating shaft of the drive motor so that they can rotate in a horizontal plane, there is a low and V wheel that can slide freely along the arm opening. When the solenoid is operated by a link rotatably fixed through a solenoid port and a bottle port also fixed to the arm opening, the load group moves in the direction of the tip of the arm via the link port. move to.

A coil spring is stretched between the rear end of the bee and the arm's side wall, and when the solenoid is released, the restoring force of the coil spring causes the rotor to move to the rear of the arm's arm. and slide back. A cutter and a clamp pin are fixed on the load end surface, and the wire 'lIt$s is inserted between the end surface of the row V14 and the inner wall surface of the arm group by moving the mouth to the end of the arm Q. (to) can be fixed with a clamp pin and cut with a knife.

In addition, a coil thread 11 is clamped between Gζ and the end surface of the clamp pin and the mouth=H, giving a predetermined elastic force to the clamp pin. r4 is a lower electrode guide provided at a position opposite to the electrode kite in the above-mentioned pipe kite with the workpiece αO interposed therebetween, and there is a wire inside the lower electrode guide. Insert the d pole (to) slidably, and wire electric (to)
to support it in place. Below the lower electrode wire, the tip of the wire electrode (to) that was supplied so as to pass through the workpiece QG is wound up, and the broken wire N1 is wound up.
A winding mechanism 11 (74) is provided to wind up the remainder of the h@ and remove it from the workpiece aQ.A wire holder is connected between the entrance of the winding mechanism σ→ and the lower Sta kite wire. One feeder (9) is provided to feed power to the workpiece α.
G and feeder (2) are a processing win! (101). A part of the winding aJ structure t741 consists of eight rollers (76ac (766) and (76Q),
A belt <766) is attached between 6B and The rotating shaft of 76I is connected to a winding motor gυ (79b) and a belt (79b), and is connected to another winding roller (79d), (79d) a-
% - (79el) are provided so as to be pressed together, and a guide pipe (79f) is provided between each winding portion.

In addition, a voltage (to) is applied between the roller (79) and the wire electrode (to) on the pipe kite (to), and if conduction is established, a signal is output from the detector ■. The TEN 912 mechanical wheel is equipped with a tension mechanism that prevents the wire electrode from sagging and always applies the predetermined tension necessary for processing to the wire electrode. The wrapped bobbin and the wire electrode (
It consists of a torque motor that rotates in the opposite direction to the feeding direction of the wire electrode (to) so that the wire electrode (to) does not come off from the bobbin. It provides a certain amount of repulsive force. FIG. 6 is an enlarged sectional view when the wire electrode is fed through the workpiece together with the pipe kite using the wire electrode feeding device described above, and the same parts as in FIG. will be added and the explanation will be omitted. In the figure, the electrode kite is fitted into the end of the pipe kite (to), and the die-shaped guide (e) made of diamond is inserted through the sintered metal body to the pipe guide (to the end). ) and has a t-shaped structure. Similarly, the lower part of the workpiece QO (a certain lower electrode guide) is also fixedly supported by a diamond tie-shaped kite (on a sintered metal body), and a tapered wire cross section is connected to the die-shaped guide. The entrance for personnel has a structure with a diameter larger than the outer diameter of the pipe kite. Matoko, lower electrode kite (
c) The center and the entrance of the winding mechanism, i.e. the roller (76t
The joint surfaces of l) and the belt (76dJ) are located almost coaxially, and the surface that contacts the wire electrode (to) on the inner surface of the feeder (b)
100 degrees is offset from the axis (for example, 0.5 to 3
1), and has a structure having a tapered introduction part (100b) having a diameter larger than the diameter of the outlet of the lower electrode guide.

With the configuration as described above, the wire ttr pole (
If you want to automatically supply the pipe kite (to) to one of the cutting start holes, for example (12),
is moved relative to the workpiece, the solenoid is activated to fully open the clamp mechanism (6), and the pipe kite (to) is released, and the drive motor is activated to move the slider α0. After moving the pipe kite (to) above the guide α4 to the top of the guide, operate the roller mechanism of the slider Qe so that the tip of the wire electrode (to) extends an appropriate amount from the lower end of the pipe guide (to). Feed the wire electrode into the pipe guide until it comes out. Next, operate the drive motor of the cutting mechanism to rotate the arm by 180 degrees in the direction of the wire electrode, and then operate the solenoid to
Cut the wire electrode (to) from the lower end of the pipe kite with a cutter at the tip, leaving a predetermined length of jIk (for example, about 8 to 10 mm), and load the remaining wire electrode (to). Clamped by the clamp pin branch at the tip of the clamp pin and keeping it in the T-frame state, operate the drive motor to return the arm to its original position, then release the clamping condition of the clamp pin and wire 11C & (to) Eliminate the remaining portion.

Next, operate the drive motor at the top of the guide α fathom,
Lower the slider (to) along guide α4, and place the pipe kite (to) fixed on slider 〇〇 on workpiece αQ.
If the cutting start hole (12 &) is larger than the outer diameter of the pipe guide (to), it is passed through and lowered to the front of the upper and lower electrode kite @ of the workpiece QO. FIG. 6 shows the state after performing the above operations. In addition, the cutting process start hole (12
If the diameter is smaller than the outer diameter of the pipe guide (to), it contacts the workpiece QC) and is lowered until the detector Q) is activated.

After that, it moves through the roller mechanism 4 on the slider aG, and while being guided by the tapered introduction part (100b) of the feeder (2), the tip of the wire electrode (to) winds up the winding mechanism t4.
This winding m m t4 f is then wound up. When the wire memory bridge reaches the rollers (79d) and (79e), the detector operates, stopping the operation of the roller mechanism, stopping the winding mechanism Q4, and operating the drive motor. Then, the Suita-aG is raised along the kite α4, and if the pipe chi V■ has penetrated through the workpiece 00, it is extracted, and if it is in contact with the workpiece αO, the contact is released. .

After that, the solenoid is returned to the predetermined position, and the lower end of the vibe kite is fixed to the guide α by the clamp mechanism at the lower part of the kite α. In this way, the wire electrode @ is passed through the workpiece aO through the cutting process start hole (128) of the workpiece hood, and power is reliably supplied to the wire electrode (to) by automatically supplying it. becomes possible.

Next, a case will be described in which the wire electrode is automatically supplied again when an abnormal situation occurs during electrical discharge cutting and the wire electrode is disconnected. If the wire electrode (to) is disconnected, the roller mechanism on the slider αQ is equipped with a reversal prevention mechanism @, so the wire electrode can will be pulled out from inside the pipe guide (to) by the tension mechanism above the guide (2). put out,
The roller mechanism keeps it clamped. Therefore, the wire electrode (to) stops moving from the bobbin to the pipe kite, the rotation of the rotation detector (to) stops, and it is determined that the wire electrode (to) has broken during processing.

At this time, the clamp mechanism (4) at the lower end of the guide α◆ is released to open the pipe guide cg3, and the drive motor ■ is rotated to raise the vibe chime l'cg3 to the top of the guide α4, and the broken wire The remaining part of the electrode is rolled up and removed from the workpiece aO by operating the winding mechanism Q4. Next, move the pipe kite (to) relative to the workpiece aO so that it is coaxial with the cutting start hole (121) on the workpiece surface, and from then on, the above-mentioned cutting start hole ( 12B), operate the wire ff & feeding device to automatically feed the wire electrode (to) so that it passes through the workpiece αO. ) is disconnected from the wire electrode (to) to the workpiece αO.
The wire is moved without electrical discharge following the cutting process, and after reaching the disconnection point, the electrical discharge cutting process is started again. In addition,
The above-mentioned relative movement of the wire 8rf4@ with respect to the workpiece αO is caused by the CNCN installed in the Wisekart electric discharge machining apparatus.
This is done automatically using a C controller (not shown).

[Problem that the invention seeks to solve]

Since the conventional wire electric discharge machining apparatus is configured as described above, when changing the wire diameter of the wire electrode (to) according to the machining conditions or machining shape, the bobbin around which the wire electric discharge machine/JG8 is wound is (c), wire kite (to), 07)
must be replaced manually by an operator,
Requires a large amount of setup time. It is impossible to change the wire electrode (to) during machining.For machining that has a small corner part, use the wire 1f pole (to) with a small wire diameter from beginning to end. Is it necessary to do this?
) There are problems such as requiring a long machining time m.
child.

In order to solve the above-mentioned problems, the present invention aims to provide a wire punch processing device that can automatically exchange wire electrodes with different wire diameters. [Means for solving the problem] The wire leveling processing equipment according to this issue is
A brake roller that applies tension to the wire and a feed-out unit that feeds out the wire electrode are provided corresponding to wires of different wire diameters, and a cylinder that is detachably engaged with the feed-out unit; The above-mentioned feeding unit is equipped with a slider that moves up and down the wire electrode supply path.

[Effect]

In this invention, the feeding unit is detachably attached to the cylinder, and then moved by the cylinder in the direction of the wire electrode supply path, and the wire W1. The wire electrodes are installed at various locations along the electrode supply path, and wire electrodes with different wire diameters are exchanged.

[Example of explanation]

An embodiment of the present invention will be explained below with reference to the drawings. Figure 1 is a block diagram showing the wire electrode supply path of the wire electric discharge machining apparatus according to the present invention. In the figure, αO is the workpiece, ( 38 is an example of diameter Q, 2*xQ) electrode, (
Th) is a wire bobbin around which a wire electrode (to) of ψ0.2 is wound, (821 is a wire of ψ0.1*L8(3
8h) is wound on a wire bobbin, (811 is ψ0.2
Brake roller, which applies tension to the wire electrode (88), (
(81b) is the ψ0.1 wire electrode (brake row that provides tension with the 38b month), (150&) is the ψ0.2 wire electrode (feeding unit that feeds out the wire when connecting the 88b),
(150b) is a feeding unit that feeds out the ψ0.1 wire electrode (88b), (152) each feeding unit, (150b) is attached to a slider that moves up and down; 152) up and down via the feed screw (to), (151&
) is a feeding unit for ψ0.2,,, ) (150B
) is attached to the sui (152) and the air cylinder to be removed, (151b) is the delivery unit for ψ0.1, and (1
Attach the air cylinder (1558), (155b) to the slider (152), and remove the air cylinder (1558), (150b), (15Qh) to the slider (1
52 Funi attached, Kiterail to escape, (154a),
(154b) is the delivery unit... (150su, (
150b is fixed and the wire is connected to the pole (88a), (8
(t5aa) is the upper kite unit 1, (158b) is the lower guide unit 1.
．． It is. Also, Figure 2 shows the upper kite unit...
58a) is a cross-sectional view showing the structure of the lower kite unit (151h), and the figure shows the parts (160&), (160&), (
160b) J, has a V-shaped cross section c'> kite, (161
a) (161b) 1. Hold down guide, (1621k)
, (162b) l! Feed electron, (166B), (1
66bJ is a holding kite (161st (161b)) and a feeder (162a), (162b) that feeds power to the wire electrode.
), (168, (isab) is the through air piping that supplies the blow I, (165a),
(1651)) is Blow Ri (166m), (166b
) is a compression spring that performs the closing action.

Next, the automatic exchange operation of wire electrodes having different wire diameters will be explained with reference to FIG. In this invention, as an example, a wire electrode (88&) with a wire diameter ψ0.2M and a wire diameter ψQ, l
m wire electrodes (88b) are used. In the automatic exchange of wire electrodes, the above two wire electrodes (88
(88b) is saved in advance in each sending unit..., (1508c (150b)).And these sending units, -,) (150, (1
50t)), as shown in the figure, each air cylinder (151 (151b) is arranged in engagement with the drive section.Next, from the above state, ψ0.
The operation when using a 2 ff wire electrode (3B&) will be described. First, drive the motor (a) and turn the feed screw (to).
, and raise the slider (152J to position A indicated by the dotted line in the figure).Then, move the air cylinder (151 &
) by driving the feed unit (150
8) moves along the guide rail (155a), and is eventually attached and clamped to the switch (152,l) at position A.

When the slider (152) that clamps the feed unit lid (150a) is lowered by the motor to the fixed position (the position shown by the solid line in the figure) via the feed screw (to), the slider (152) is moved to the air cylinder (151aJ). The drive unit also returns to its original position. This state is shown in Figure 1, and after this, ψ0
．． A feeding hem operation of 2M wire electrodes (88&) is performed.

Next, from the above state, a wire electrode (
The operation when exchanging the 88b moon will be described.

First, after moving the drive part of the air cylinder (151a) for ψ0.2 to a predetermined position in the axial direction of the wire electrode (88a), the switch (152) is moved by the drive of the motor (1). Rotate the feed screw side and raise it to position A shown in the figure. At this time, the feeding unit (150aJ) for ψ0.2 is engaged with the drive part of the air cylinder (15]a).After this, the air cylinder (151a) is driven to return the drive part to its original position. Therefore, ψ0.2
feeding unit (150aJ is a slider (152
) and is held in the position shown by the dotted line in the figure. Next, the delivery unit p for ψ0.1 (IF
+Oh) and the air cylinder for ψ0.1 (1
By moving the 51J drive unit to the predetermined position on the above axis, the delivery unit for ψ0.1 (150J
is a delivery unit for ψ0.2, t(150aJ'
, r The slider (152) held in the disengaged position
The device will be reloaded. Then, by driving the motor (1) and lowering the slider (152J) to the fixed position using the feed screw (to), the feed unit for ψ0.1 is...
・When To (150h) is held in place, Tomo
The drive section of the air cylinder (151b) also returns to its original state.

p'', the exchange operation from the ψ0.2 ff wire electrode (88 mm) to the ψ0.1 cod wire electrode (88 hJ) is completed.The wire tension should be changed according to the wire diameter. However, in this invention, independent brake rollers (81a) and (8th) are provided for each wire electrode (88a<5sh), so no matter which wire electrode is used, the Appropriate wire tension will be applied.

Now, next, a description will be given of the wire electrode supply operation that is performed after the wire electrode of φ0.2 or ψ0.1 is fixed by the operation on the PJ. As shown in FIG. 2, the upper and lower kite unit, ) (158).

(158h) is a kite with a V-shaped cross section (160aJ, (
160h) and a presser foot guide (16
1.

(161hJ) and a blower (166a (166b)) that fixes the feeder (162h).
The air cylinder (168a) (161
b,) moves against the compression spring (1658h) (rightward in the figure) and blows.

(1668), (166bJ to kite (160aJ,
Become a wholesaler from (160h). In the above state, the slider <152) which was in a predetermined position starts to descend, passes through the guide vibrator (154i; upper guide unit (TSAa) and the cutting start hole (12) of the workpiece αG, uni") (158b). Then, the pulley (150) of the feeding unit, )
By driving C) and C, the wire electrode C is fed through the guide vibe (154). Then, the wire electrode can is placed on a roller (79a) which is a collecting section for wire electrodes.
After reaching 8 (79e), the slider (1527) rises and returns to its original position.
54) will also be raised. Next, air distribution! f (1648), (t64Jkauc7)Km
By stopping the air supply, the blower (166, (166b)) is biased by the compression spring (165, (165b) and moves toward the guide (160, (16011)).

This causes the wire electrode □□□ to become the presser guide (161a).
, (161J presses and holds the guide 1608c (160b), the feeding operation of the wire electrode (towards) is completed, and the machining start state is maintained. 5 The series of operations described above is All of this is done in response to commands from the NO equipment (not shown), and so-called continuous program rotation is possible.Therefore, everything from exchanging the wire electrodes to machining can be done automatically. , Maani, cylinder (151a), (151b), (16
8a), (161'1tl) is not limited to air, and it goes without saying that it may be, for example, hydraulic pressure or other fluid.

By the way, when exchanging wire electrodes with different wire diameters, y,=
w, kite (160a) (1611) As shown in Figure 3, a positional deviation ly occurs in the translational direction (y direction) of the electric center.This positional deviation ly occurs inevitably; In the case of a guide with a V-shaped cross section as shown in the figure, the positional deviation ly can be found by
If there is no deviation in the direction of the upper and lower guides (160h), no deviation will occur in the X direction, but as shown in FIG.

(If 160hJ is misaligned by ψ, a positional misalignment lx in the X direction will occur when replacing the wire electrode.

In the figure, the positional deviation lx is 彊ψ lx:lysmtp=(d+-d2P-(2) θ is required.

Therefore, if the respective positional deviations 1X and 17 that occur during wire electrode exchange are automatically corrected using the No. 1 device, for example, automatic processing including wire electrode exchange can be performed without any particular positioning.

In addition, for the positional deviations IX and ly in the correction, values calculated theoretically using the above formulas (1) and (2) may be used, or the actually measured deviation distances may be memorized in advance and these values may be used. It doesn't matter what you use. Further, although in the above description the positional deviation correction at the time of wire electrode replacement is performed using coordinate values, it is also possible to move the X-Y table according to the correction temperature using a program.

〔Effect of the invention〕

As described above, according to the present invention, a brake-dedicated roller that applies tension to the wire fitdk and a feed-out unit that feeds out the wire electrode are provided for each of the wire medium electrodes having different wire diameters. Since the feed unit is configured to be automatically replaced, different wire electrodes can be automatically changed depending on the machining conditions and machining shape, allowing wire electrical discharge machining to perform highly accurate and efficient machining. There is an effect that the device can obtain.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing a wire electrical discharge machining apparatus according to an embodiment of the present invention, Fig. 2 is a detailed view of the kite section according to the invention, and Figs. 8 and 4 illustrate positional deviation during wire electrode replacement. Figures W7 & 5 are configuration diagrams showing conventional equipment.
FIG. 6 is a partial cross-sectional view of a conventional wire electrode supply device. In the figure, α0 is the workpiece, (88aha (88h
Ear electrode from the moon, (81aJ, (81h) brake low, (150aJ. (150b) Ha delivery unit, (151&J, (
151b) is a cylinder, and (152) is S → Ita @
In addition, in the figures, the same reference numerals indicate the same parts.

Claims (1)

[Claims] A brake roller that applies tension to the wire electrode, a feed-out unit that is equipped with a wire electrode feed-out mechanism and a guide pipe through which the wire electrode is inserted are provided for each of the wire electrodes having different wire diameters, and the feed-out unit is freely detachable. 1. A wire electrical discharge machining apparatus comprising: a cylinder that is engaged with the cylinder; and a slider that is mounted with the above-mentioned feeding unit and moved up and down along a wire electrode supply path by movement of the cylinder.