JPS58149133A - Wire electrode feeder for wire cut electrospark machining apparatus - Google Patents

Abstract

PURPOSE:To achieve full automatic operation by providing a mechanism for taking up a wire electrode supplied into a workpiece. CONSTITUTION:A pipe guide 36 provided in the interior of the end with electrode guides 72, 92 for supporting slidably a wire electrode 38 is provided with a detector for detecting contact with a workpiece 10 and a crank mechanism section 2 for fixing the pipe guide 36 while being provided with a pair-of-rollers mechanism 22 having a reversal preventing mechanism 29 for semi-stopping the wire electrode 38 not to drop it out of the pipe guide 36 in disconnection of the wire electrode, a take-up mechanism 74 for taking up and end of the wire electrode 38 supplied to extend through the workpiece 10 while removably taking up the remaining disconnected wire electrode 38, etc. to achieve full automation of operation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applied to a wire electrode supply device of a wire-cut electrical discharge machining machine in the case that the wire of the lid made of wire-cut electrical discharge machining is broken during cutting.

lowering a new wire electrode with the pipe guide;
It can be fed at a predetermined position or at a position where the pipe guide is in contact with the workpiece, and if there is a separate thorough cutting part on the same workpiece, the wire electrode can be automatically cut once. This invention relates to a wire electrode supply device for a wire-cut electrical discharge machining machine that can automatically supply a wire electrode to the next cutting location.

A wire electrode is opposed to the workpiece through a small gap, and a pulsed electric discharge is generated between the workpiece and the wire electrode.
A wire-cut electric discharge machining apparatus that cuts a workpiece using electrical discharge energy is well known, and has the advantage of being able to easily perform complex cutting of hard metals with high accuracy.

However, when attempting to perform electrical discharge cutting on a workpiece, K
Vi, it is necessary to feed the wire electrode so that it passes through the workpiece.

The wire electrode is usually 2 side metal j! It is made by

It is difficult to manually feed the wire through the workpiece, and the wire electrode may break due to an abnormal situation during electrical discharge machining. In addition, when there are multiple separate cutting parts in the same workpiece, as in the case of progressive cutting, for example, Conventionally, after cutting one cutting process, the wire electrode had to be cut and removed, and the wire electrode had to be re-supplied manually to the next cutting start point, which was difficult to do. Full automation of electrical discharge machining equipment was not possible, which caused a significant drop in machining efficiency.

The present invention has been made in view of the above-mentioned conventional problems, and
The purpose of this is to automatically cut the wire electrode at a predetermined position, which allows the wire-cut electrical discharge machining equipment to be fully automated, eliminate the wire electrode that remains after cutting, and place a pipe guide at the position where the wire electrode is to be penetrated into the workpiece. If there is a hole larger than the outer diameter, wire the electrode along with the pipe guide.

It asks you to penetrate the inside of the workpiece, and automatically feeds it at the required position (the same goes for the outside of the workpiece).

If the hole diameter of the workpiece is smaller than the pipe guide outer diameter,
It is an object of the present invention to provide a wire electrode supply device for a wire-cut electric discharge machining apparatus that can automatically supply only a wire electrode at a position where a pipe guide contacts a workpiece.

In order to achieve the above object, the present invention aims to generate electric discharge energy by arranging a wire electrode to face a workpiece through a small gap and generating a pulsed discharge between the workpiece and the wire electrode. Nyo 9 A wire-cut electric discharge machining device for cutting a workpiece includes a pipe guide having an electrode guide inside the tip for slidably supporting a wire electrode, and a pipe guide facing the pipe guide with the workpiece interposed therebetween. ta position f
an electrode guide that slidably supports the wire electrode;
A moving mechanism that moves the pipe guide so that it passes through the workpiece, a detector that detects contact between the pipe guide and the workpiece, a clamp mechanism that fixes the pipe guide in a predetermined position, and a pipe guide that is integrated with the pipe guide. In addition to supplying the wire electrode into the pipe guide, it also has a reversal prevention mechanism that prevents the wire electrode from coming out of the pipe guide when the wire electrode breaks. , a cutting mechanism that cuts the wire electrode at a predetermined position and removes the cut remaining portion of the wire electrode, and a cutting mechanism that winds up the tip of the wire electrode that has been fed through the workpiece and removes the remaining portion of the broken wire electrode. The winding mechanism eliminates winding and prevents the wire electrode from sagging.
It is characterized by comprising a tension mechanism for applying a predetermined tension necessary for normal pressure processing.

Preferred embodiments of the present invention will be described below based on nine drawings.

FIG. 1 shows a preferred embodiment of the wire electrode supply device according to the present invention.

alt-t: A workpiece placed on an XY cross table (not shown) that is movable in a horizontal plane. (12
m) and (12b) are cutting process start holes drilled in advance on the surface of the Vi workpiece frame. I is a guide supporting the wire electrode supply device.

It is fixed to the main body (not shown) of the wire-cut electric discharge machining apparatus on a shaft movable in two axes, that is, in the vertical direction. Gu is a slider that forms part of the movement mechanism (Iη,
The guide (provided so as to be able to freely slide up and down along I4).

A drive screw (2) is screwed into the slider (4), and the upper end sti of the drive screw (QII) is connected to a drive motor (2) fixed to the upper part of the guide shaft. automatically slides along the A roller mechanism (2) is provided on the slider special. The roller mechanism (2) consists of a pair of wire electrode feed pulleys and a clamp pulley (to), and the rotation axis of the wire feed pulley is connected to the wire electrode feed motor (to) fixed to the slider 4. Connected.

Further, the wire electrode feeding pulley K is provided with a reverse rotation prevention mechanism. Furthermore, the clamp pulley (to) is
Rotatably fixed to the slider via the bottle
The tip of the link (32) has a rotatable shaft bearing, and the link (
32) The rear end is connected to the slider aQ via the coil spring (34).
Due to the elastic force of the coil spring (34), the clamp pulley at the tip of the link (32) is always pressed against the peripheral edge of the wire electrode feeding pulley. (3g) A pipe guide (in the example, a pipe with an outer diameter of 2 to 3 pieces) into which the Fi wire electrode (38) can be inserted and supported, and whose upper end is connected to the fitting (40). The slider 4 that constitutes the moving mechanism aD is fixed to the base through the slider 4. An electrode guide (shown in FIG. 2) that slidably supports a wire electrode (3s) is fitted into the lower end of the pipe guide (36). Therefore, a predetermined voltage (8) is applied between the pipe guide (36) and the workpiece α.
0) is applied and when the pipe guide (36) and the workpiece (111) come into contact, a signal is output from the detector (91), and this signal causes the drive motor (to) to stop and the wire electrode The feed motor (2) is driven, and the wire electrode (38) is drawn out from the pipe guide (36).

A clamp mechanism (42) is provided that can support and fix the pipe guide (36) in a predetermined position.

The clamp 1Nm (4z) has a V-groove cut in the lower part of the guide (14), a clamp plate (44m), and a solenoid (22) fixed to the guide I.
-, a high lamp plate (44b), and a solenoid (
46), one clamp plate (44b) separates from the other clamp plate (44m) and the clamped state is released, and when the solenoid (46) is reset, the solenoid (46) and clamp plate (44b) Due to the elastic force of the coil spring (48), one clamp plate (44b) approaches the other clamp plate (44&) and maintains the clamped state.

(S(1) Fi, cut the wire electrode (38) at a predetermined position.

It is a cutting mechanism that removes the cut residue of the wire electrode (38), and (52) is an arm of the main body, and the arm (52)
is a drive motor (54) fixed to the side wall of the guide I.
The drive motor (
54) is fixed to the rotating shaft.

A rod (56) that is slidable along the arm (52) is provided inside the arm (52).
) Fixed solenoid (58) and bottle (@O)
When the solenoid (58) is actuated by the tongue and groove link (62) rotatably fixed thereto, the rod (56) moves toward the tip of the arm (52) via the link (I2). In addition, the rear end of the rod (5G) and the arm (52)
A coil spring (64) is stretched between the side wall surface and the coil spring (64) when the solenoid (58) is released.
The restoring force of 6 causes the rod (SS) to slide back to the rear of the arm (52). The rod (56) has a cutter (
66) and a crank bin (ε8) are fixedly installed, and the rod (56) is moved toward the tip of the arm (52) to insert the wire electrode between the tip surface of the rod (56) and the inner wall surface of the arm (52). (SS) can be fixed with a clamp bin (@8) and cut with a knife (66). A coil spring (TO) is clamped between the clamp bin (68) and the tip of the trond (56), giving a predetermined elastic force to the clamp bin (@8). @(72) is the workpiece. The wire electrode (38) is slidably inserted into the electrode guide provided at a position facing the electrode guide in the pipe guide (36) with an object interposed therebetween. to support it in place. Below the electrode guide (72), the tip of the wire electrode (38) that has been supplied so as to pass through the workpiece is wound up, and the remaining part of the broken wire electrode (38) is also wound up and the workpiece is wound. A winding mechanism (T4) is provided to remove the material from the middle. The -1 shaft 5 of the winding mechanism (T4) consists of 3@row 5- (7@hatake), (rlb) and (r@g), and the belt (76m) is installed between (76m) and (T1).
si) is attached, and 3 through bell) (76d).
The rollers (711b) are arranged so that their peripheral edges come into contact with each other, and one roller (711b)
The rotating shaft is a winding motor (T8) and a roller (79m).
), (7!b) and the belt (19@), and are connected to another take-up roller (71d), so that the 1jo roller (716) is pressed against the roller (71d). A guide pipe (7
9f) is provided. Also.

A voltage (93) is applied between the roller (7!I.) and the wire electrode (38) on the pipe guide (36), and a signal is output from the continuity detector (92). Additionally, above the guide roller 4, there is a wire electrode (3g) that prevents the wire [& (38) from sagging and always maintains the predetermined tension necessary for processing.
A tension mechanism (8θ) for applying K is provided. The tension mechanism (80) is a wire electric & (311)
bobbin (82) wound with wire electrode (311)
It consists of a torque motor (84) that rotates in the opposite direction to the feeding direction of the wire electrode (38) so that the wire electrode (38) does not come off the bobbin.
A constant repulsive force is always applied to the feeding direction f of the wire a (38).

FIG. 2 is an enlarged cross-sectional view when the wire electrode is fed through the workpiece together with the pipe guide using the wire electrode supply device described above, and FIG. FIG. 3 is an enlarged cross-sectional view when supplying a wire electrode in contact with the wire electrode. The same members K1-1 as in FIG. 1 are given the same reference numerals and their faces are omitted. (sO) is the pipe guide (
36) A die-shaped guide (92) molded from diamond is fitted into the inner light end and is also an electrode guide, which is fitted into the pipe guide (3s) via the sintered metal body (94). It has a similar structure. Also, an electrode guide (72) 4 and a diamond die-shaped guide (g6), which are also located below the workpiece α1, are fixedly supported by the sintered metal body (SS), and a tapered shape is formed to reach the die-shaped guide (!@). The inlet of the wire introduction 8 (119) has a diameter larger than the outer diameter of the pipe guide (36) and has a nine-structure structure.

With the above configuration, the wire electrodes (3
When trying to automatically supply a), install a pipe guide (3) coaxially with one of the cutting start holes 9, for example (12 m)
6) is moved relative to the workpiece tl [, the solenoid (46) is operated to open the clamp mechanism (42), the pipe guide (3@) is in the released state, and the drive motor Z is operated. After moving the slider US above the guide I and moving the pipe guide (36) to the top of the guide 64.

Activate the roller mechanism (2) of slider ae to feed the wire electrode (38) into the pipe guide (36) until the tip of the wire electrode (3I) extends an appropriate amount from the lower end of the pipe guide (1@). do. Next, the drive motor (54) of the cutting mechanism (5a) is activated to rotate the arm (52) 11 times in the direction of the wire electrode (38).

Activate the solenoid (58) and use the cutter (66) at the tip of the rod (5G) to connect the wire pole (3s) to the pipe guide (
36) A predetermined t from the lower end (1 to 1 in the example)
Cut the remaining length of the wire electrode (38) and attach it to the clamp bin (ε@) at the tip of the rod (5G).
Clamp from K and keep at t.

Activate the drive motor (54) and move the arm (52) again.
After returning the wire to the original position t, the clamping condition of the clamp bin (68) is released to remove the remaining part of the wire [pole (38). Next, operate the drive motor above the guide I to lower the slider qQ along the guide a4, and move the guide (36) fixedly attached to the slider αQ to the cutting start hole of the workpiece αl. (12a) is the pipe guide (36
), it is passed through twice and lowered to the front of the electrode guide (T2) below the workpiece 01. In addition, if the cutting start hole (12 m) is smaller than the outer diameter of the pipe guide (36), it will come into contact with the workpiece arj and the detector (9
1) Lower it until it operates. The state after the above operations are not shown in FIGS. 2 and 3. After achieving this state, the roller mechanism on the slider ae is operated to feed the wire electrode (3B) into the pipe guide (36) again, and the electrode guide (92) and (
T2) is passed through the inside of the wire electrode (38) so that the tip S of the wire electrode (38) is wound up by the winding mechanism* (74), and when the wire electrode (38) reaches the rollers (71d) (19.), The detector (92) operates to stop the roller mechanism (2) and the first winding a mechanism (T4), and also operates the drive motor (2) to move the slider αG along the guide (14). and raise it.

If the pipe guide (36) is passing through the workpiece ring, it is removed, and if it is in contact with the workpiece 41, the contact is released.

Thereafter, the solenoid (46) is returned to a predetermined position, and the lower end of the pipe guide (36) is fixed to the guide a4 by the clamp mechanism (42) at the bottom of the guide 0. In this way, the wire electrode (38) can be passed through the workpiece H and automatically supplied to the cutting start hole (12m) in the workpiece αO.

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 (3B) is disconnected, the roller mechanism (2) on the slider 4 is equipped with a reversal prevention mechanism (to), so the wire electrode (3B) will be The clamped state is maintained by the roller mechanism (2) that pulls out the pipe guide (36) from inside.Therefore, the wire electrode (38) is removed from the Fi bobbin (82) and the pipe guide (3
6), the rotation of the two-rotation detector (86) is stopped and it is determined that the wire electrode (38) has been disconnected during processing. At this time, guide a◆clamp mechanism at the lower end (
42) to open the pipe guide (36), and rotate the drive motor (a) to open the pipe guide (36).
) is raised to the top of the guide I, and the winding mechanism (T4) is activated to wind up and remove the remaining part of the broken wire electrode (38) from the workpiece hoop. next.

The pipe guide (36) is moved relative to the workpiece αQ so that it is coaxial with the cutting start hole (12m) of the workpiece, and from then on the above-mentioned cutting start hole (12m) is moved.
The wire electrode supply device is operated according to the method for supplying the wire electrode (38) to the wire electrode (38).
is automatically fed so as to penetrate through the workpiece aQ. After that, the wire electrode (38) is moved to the workpiece @H to the position where the pole (311) is broken in the wire ′ without discharging, following the cutting process, and after reaching the broken point, the wire electrode (38) is discharged again. Start cutting. It is preferable that the relative movement of the wire electrode (38) with respect to the workpiece a is automatically performed using a CNC control device (not shown) provided in the wire-cut electrical discharge machining apparatus 1.

Next, a method of supplying the wire electrode (38) when the same workpiece OG has a plurality of separate cutting locations will be described.

After cutting one cutting point on the separated workpiece 00, the winding motor (T8) below the workpiece aQ, which was rotating during the cutting process, is stopped.

Stop the movement of the wire electrode (38). Next, the solenoid (46) of the clamp mechanism (42) is operated to release the clamped state, and the drive motor (7) at the top of the guide a4 is activated to move the pipe guide (36) up to the top of the guide 64. . Thereafter, the arm (52) of the cutting mechanism (50)
) in the wire direction & (38) direction.

A solenoid (46) is manufactured, the wire electrode (38) is cut with a knife (66), and a 9-winding motor (γ
8) and use the winding mechanism (T4) to remove the wire electrode (
38) Remove the cut residue from the workpiece al.

Then, the cutting mechanism (50) is connected to the wire electrode (38) again.
) and move the workpiece (IQ) so that the next cutting start hole (12b) of the workpiece aQ and the pipe guide (36) are coaxial. Then, a wire electrode (3
8), the wire 11-pole feeding device is operated to automatically feed the wire electrode (38) through the workpiece 01 to continue electrical discharge cutting. do. The torque motor (84) of the tension mechanism (SO) above the guide 0 applies torque in the opposite direction to the feeding direction of the wire electrode (38) to the bobbin (82).
[Always give the wire electrode (38) with respect to the feeding direction,
It functions to apply a constant tension to the wire electrode (38).

1. When lifting the pipe guide (36) to the top of guide I with the wire electrode (3 days) clamped by the roller mechanism (foundation), the bobbin (s2) and roller mechanism (
2) to prevent the wire electrode (38) from sagging.

As described above, according to the wire electrode supply device of the wire-cut electrical discharge machining apparatus according to the present invention, when an abnormal situation occurs during cutting and the wire electrode is disconnected, the remaining wire electrode disconnection is automatically removed from the workpiece. This makes it possible to automatically feed one pole of wire through the workpiece regardless of the machining start hole diameter of the workpiece. In addition, when there are multiple cutting parts spaced apart by 5+ in the same workpiece, after the cutting process of one cutting part is completed,
After the wire electrode is automatically cut once and removed from the workpiece, the wire electrode can be automatically supplied again to the point where the secondary cutting process starts, allowing the cutting process to continue without human intervention. becomes. As a result, if the wire electrode supply device is automatically controlled using the CNC control side of the wire-cut electrical discharge machining machine, the wire-cut electrical discharge machining machine can be fully automated and unmanned, greatly increasing machining efficiency. becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a perspective explanatory view showing a preferred embodiment of the wire electrode supply device according to the present invention, and FIG. FIG. 3 is a partially enlarged cross-sectional view of the wire electrode supply device in which the wire electrode is supplied by penetrating the workpiece, and FIG. It is an enlarged sectional view. Same member KFi in each figure
The same symbol is attached to L, (1G is the workpiece, (38) Fi
'fire electrode, (72) o and (92) are electrode guides,
(36) Fi vibe guide. α7) F'i movement mechanism, (42) Iri clamp mechanism,
cab reversal prevention mechanism, (2) is a roller mechanism, (50
) is the cutting mechanism (14) is the winding mechanism, and (SO) is the tension am. Agent Nobu Tsutano - Figure 1 4 〃2.昂／i −2ρ ノ112 ′113 Ill,!
l/26 4 6? ?
Otsu 722' 17ri. 40' / 31 3ρ 36 /' 1 2 deρ ・ 15ride, e~ 〃
＼ a /2dll ” ” 5t q3 // /2'b" , /2ri11 ri2 /ri4 Figure 2 Figure 3 Procedural amendments Mr. Commissioner of the Japan Patent Office 1, Indication of the case Patent application No. 7- 304-I No. 2,
Name of the invention Wire electrode supply device 3 for wire-cut electric discharge machining equipment, person making the amendment 5 Subject of amendment (1) Detailed explanation column of the invention in the specification, (2) Drawing 6 Amendment-No] Contents (D Details In the 8th line of the 13th page of the book's Chutsutsu, the text [-kawa is a pipe kite-1] is corrected to ``The plane is a pipe kite-1. (2) Lines 10 to 11 of the 13th page of the same book. (3) Correct the 2nd figure of the cylinder in the drawing as shown in the attached sheet. (4) Correct Figure 3 of the drawing cylinder as shown in the attached sheet, 7. List of attached documents (1) Revised iE drawings (Figure 2, Figure 3) At least one copy each of Figure 2, Figure 3

Claims (1)

[Claims] fll A wire electrode is opposed to a workpiece through a small gap, a pulsed electric discharge is generated between the workpiece and the wire electrode, and the workpiece is moved by the discharge energy. A wire-cut electrical discharge machining device that performs cutting processing includes a pipe guide that is equipped with an electrode guide inside the tip that slidably supports a wire electrode, and a wire electrode that is positioned opposite to the pipe guide with a workpiece interposed therebetween. and an electrode guide that is slidably supported. A moving am mechanism that moves the pipe guide in the direction of the electrode guide facing the pipe guide. It has a clamp mechanism that fixes the pipe guide in place and moves together with the pipe guide. A pair of roller mechanisms are equipped with a reverse rotation prevention mechanism that can supply the wire electrode into the pipe guide and prevent the wire electrode from coming out of the pipe guide when the wire electrode is disconnected, and the wire electrode is placed in a predetermined position. Cut with. A cutting mechanism that eliminates the cut residue of the wire electrode. The present invention includes a winding mechanism that winds up the tip of a wire electrode supplied so as to penetrate through a workpiece, and also winds up and removes the remaining part of the broken wire electrode, and prevents the wire electrode from sagging. A wire electrode supply device for a wire-cut electrical discharge machining device, which includes a tension mechanism for constantly applying a predetermined tension necessary for machining, is equipped with a detector for detecting that the pipe guide has contacted the workpiece, and the pipe When the guide reaches the predetermined position 1 without contacting the workpiece, the pair of rollers is driven and the wire tf! and when the pipe guide comes into contact with the workpiece, the movement of the pipe guide is stopped by the detection signal, and the pair of rollers described in vJ are driven to supply the wire electrode. Electrode supply device. (2) In the device according to claim 1. A wire electrode supply device characterized in that the electrode guide at a position facing the pipe guide is an electrode guide having a tapered introduction part having a diameter larger than the outer diameter of the pipe guide.