JPS59232730A - Wire electric discharge machine - Google Patents

Abstract

PURPOSE:To make a highly accurate machining operation performable, by having a wire electrode cut by means of spark discharge, while constituting a device so as to eliminate any variations in wire feed rate and wire tension, besides adding no external force to the wire electrode during the electric discharge machining operation. CONSTITUTION:A wire electrode 1 is led into space between a capstan 11a and a pinch roller 11b in rotation and then moved downward after being passed through by friction. And, when this electrode 1 comes close to a cutter 10a in rotation, high voltage from an electric power unit 12 is impressed on space between the electrode 1 and the cutter 10a so that spark discharge is produced between them, thus the electrode 1 is cut off. This cutting motion is determined by a correlative value made between a linear speed of the electrode 1 being moved downward and a circumferential speed on the cutter 10a so that the electrode 1 comes to a small piece 1a into the specified length, then drops down inside a wire recovery box 8 in succession, thus recovery takes place. Doing like this, highly accurate machining is performable and a significant improvement in machining efficiency is well promotable.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire electrode recovery device for a wire electrical discharge machining machine, which automatically cuts and collects used wire electrodes in the wire electrical discharge machining machine.

Conventionally, wire electrical discharge machining equipment usually has a
Using a wire electrode of 6 to 33 fIm, apply 811:Y to the machining power source using a machining liquid such as water as a medium in the minute gap between the workpiece and the wire electrode, and discharge? bring about Also, the relative feed motion between the workpiece and the wire electrode is
This is performed by a Y-cross table, and the control of this feeding movement is performed by a control device for each motor provided on the X-Y cross-table.

Conventional heel devices include those shown in FIGS. 1 and 2. In Fig. 1, (11 is the wire electrode after radiation processing, (2) is the workpiece, (3) and (4)
) is the wire guide, (5) is the wire feeding mechanism, (6
] is the wire reel, (force is the wire collection reel, (8) is the wire collection box, and the body) As shown in the figure, the wire electrode (1) is pulled by the wire feeding mechanism (5).
A rotatable, unused wire electrode (1) is supplied from a Y-wound wire reel (6), and a wire guide selection, a workpiece (2), a wire guide (4), and a wire feeding mechanism (5) are provided.
) and a wire collection reel (a method of collecting the wire by winding it by force), and a wire feeding machine #I (5
There is a method of collecting the wires by dropping them into a wire collection box (8) provided under the wire collection box (8).

Next, in FIG. 2, (9) is a wire feeding mechanism;
(9a) is a feed-out capstan, (9b) is a feed-out roller with a cutter provided with many cutters on the outer periphery, (9c)
is a drive motor that drives the wire feeding mechanism (9);
(8) is a wire collection box installed under the wire feeding mechanism (5), and the wire electrode (1) fed into the wire feeding mechanism (9) is carried by a rotating feeding roller with a cutter (
Cut the capstan (9b) with a cutter provided on the outer periphery of the capstan (9b).
The wire is cut between a) and L') into small pieces 9, which fall into a wire collection box (8) and are collected.

Since the conventional wire electrode collection device is constructed as described above, the wire collection reel (7
) and the volume of the wire collection box (8) in the case of BL (in the same figure), so during electrical discharge machining, it is necessary to replace the wire collection reel with an empty reel (or replace the wire collection box) In order to remove the used wire in (8), the drive of the wire feeding mechanism (5) is temporarily stopped L, and since a high voltage of 1! is applied to the wire electrode (1), this power supply must be cut off. It is necessary to do it.

Therefore, during processing, it is always necessary for the operator to confirm the remaining recovery capacity, and based on this confirmation, the operation of stopping the driving of the wire feeding mechanism (5) and cutting off the power to the wire electrode (1) is performed. For this reason, in both of the methods shown in Figures (a) and (Bl), machining must be interrupted, which reduces machining efficiency.
The i5 also had a temporary promise that unmanned wire electrical discharge machining could not be achieved. Furthermore, in the above method (in the case shown in the BL figure), the used wire electrode (1) is cut after falling into the collection box (8), so the used wire electrode (1) is cut while the wire electrode is still energized. Although it is possible to remove the wire electrode (1),
The drawbacks were that safety equipment was required to protect against high voltage, and the work was dangerous.

In the method of cutting the wire electrode (1) using the wire feeding mechanism (91), such as the wire feeding roller (9b) shown in FIG. In order to remove these pieces from the wire collection box, it is necessary to stop the drive of the wire feed/output mechanism (5) and cut off the power to the wire electric α (1) as described above in connection with the jZH case shown in Fig. 1. However, the wire electrode (
In order to cut 1), the wire feed speed and wire tension fluctuate, which has the drawback of reducing processing accuracy.

The present invention has been made to eliminate the above-mentioned drawbacks and eliminates the need for used wire electrodes, fluctuations in wire feeding speed and wire tension. One knee q without giving and cutting continuously
, the wire is dropped into the Eiya collection box, so the wire delivery mechanism and the wire'v! The present invention provides a highly efficient wire electrical discharge machining device that is capable of high precision machining and does not require interruption of electrode cutting.

An embodiment of the present invention will be described below with reference to the drawings. Third
The figure shows the configuration of the present invention, in which (1) is a wire electrode, (1a) is a small piece of the wire electrode (1) after cutting,
(8) is a collection box, (11) is a wire feeding mechanism (1
It consists of a capstan (1a), a pinch roller (11b), and a drive motor (Ilc). The capstan (11a) is rotated by the drive motor (1ie'), and the pinch roller (11c) is rotated by the capstan (11c). 11a)
It is designed to be pressed into contact with a spring, etc. (10)
is a cutter rotation mechanism, the cutter (10a), the cutter (10b)
It is composed of a cutter drive motor (10c) and a rotor (10c), and as shown in the ta1 diagram in FIG. The cutter drive motor drives the rotor (1
0c) as an axis.

Also, the cutter (
10a) forms a V-shaped cross section in the direction of the spout. Again in FIG. 3, (12) is a power supply device, (13a) and (13b) are power supply devices, and (14) is a control device. The electrode (1) and the other are connected to the cutter rotation mechanism (10) via the feeder (13b), and the control device (14) i
One side is connected to a drive motor (ilc), and the other side is connected to a cutter drive motor (10b).

Next, we will explain the operation 6 In Fig. 6, a wire electrode (1) is guided between a capstan (Ila) rotating in the direction of the arrow in the figure and a pinch roller (11b), and is passed by friction and downwards. Move to. When the wire electrode (1) that has moved downward approaches the cutter (10a) that is being rotated by the cutter drive motor, a high voltage from the power supply (12) is applied to the feeders (13a) and (13).
b) is applied between the wire electrode (11) and the cutter (10a), so a spark discharge is generated between them and the cutter is cut.This cutting operation is caused by the wire electrode (1) moving downward.
The correlation value j between the linear velocity of the cutter (10a) and the circumferential velocity of the cutter (10a). The pole (1) becomes a small piece (1a) and successively falls into the wire collection box (8) and is collected. In this case, the power supply device (12) is used for switching circuits such as capacitor circuits, transistors, etc., or machining power supplies for electrical discharge machining equipment.Also, if the cutter (10a) is always rotating at a constant speed, When setting a different wire feeding speed Y depending on the thickness of the workpiece, the thickness of the wire electrode, etc., or when changing the wire feeding speed during machining (in this case, the Since the wire length b'-- will be uneven, the control device (14
) according to the rotation speed of the drive motor (11c),
By controlling the number of revolutions of the cutter drive motor (10b) to increase or decrease, collection wires of a constant length can be obtained, making collection easier.

As described above, according to the present invention, the wire electrode is not cut mechanically but by spark discharge, so that no external force is applied to the wire electrode during electrical discharge machining, and the wire feed speed and wire Since there is no fluctuation in tension etc., it is possible to apply high precision, and since the wire electrodes #"- and J\ pieces of ml are continuously collected in the collection box,
Since there is no need to stop operation when removing this small piece, a wire electrical discharge machining apparatus with high machining efficiency can be obtained.

[Brief explanation of drawings]

Figures 1 and 2 are configuration diagrams showing a conventional example, and Figure 1 (
a) is a method of winding up used wire electrodes on a collection reel;
FIG. 2B shows a method in which the used wire electrodes are continuously dropped into a collection box, and FIG. 2 shows a method in which the used wire electrodes are cut into small pieces with a mechanical cutter and then dropped into the collection box. 6 and 4 are diagrams showing one embodiment of the present invention, FIG. 3 shows the overall configuration, and FIG. 4(a) is a top view and front view of the cutter rotating section, and indicates the main parts of the cutter. (1)...Wire electrode, (1a)...Small piece, (8J
...Collection box, (10) °°・Cutter rotation mechanism, (10
a) Cutter, (10b) Cutter drive motor, (10c) Rotor, (11) Feeding mechanism, (11a) Capstan, (iib) Pinch Laura, (1ie)...Tiger 1. Yapstan drive motor, (12)...power supply device, (1 core...control device. Agent Masuo Oiwa Figure 1 (0) 3 6 1 (b) Figure 2 Figure 3 Figure $4 (a) ) 0c (b) (c) Procedural amendment (spontaneous) July 4, 1982 (Mr. Commissioner of the Japan Patent Office 1, Indication of case Patent application No. 106034/1982 2,
Title of the invention: Wire electrical discharge machining device 3. To the person making the amendment, Representative Hitoshi Kataniku. do. (2) r (11c) J k on page 6, line 12 of the specification
Dlld) J). (3) "Feeding mechanism" on page 9, lines 16 to 17 of the specification is corrected to "wire feeding mechanism." (4) Figure 2 of the drawings shall be corrected as indicated in red on the attached amended drawing. The above appended claims (amendment) ``(1) In a wire free-turn machining device that performs machining using a machining fluid in a minute gap between a wire polarization and a workpiece as a medium, a capstan and a full pressure contact of the capstan a feed mechanism comprising a pinch roller and a motor for driving the capstan; a cutter rotation (multi-groove) comprising a rotor having at least one cutter on the circumference and a motor for driving the rotor; - The wire electrode is provided with a power supply device connected to the rotor on the other hand, and a collection box provided below the cutter rotation mechanism, and the wire is inserted and passed between the capstan and the pinch roller. When the rotating cutter approaches the wire electrode, the wire '1 pole is cut by a spark discharge due to the pressure applied by the power supply device, and falls into the collection box and is collected. (The wire discharge machining device according to claim 1, which is equipped with a control device that increases or decreases the rotation speed of the cutter drive motor according to the rotation speed of the capstan drive motor. ” 1 Tokisho 59-232730 (5)

Claims (1)

[Scope of Claims] (11) In a wire electrical discharge machining device that performs machining using a machining fluid present in a minute gap between a wire electrode and a workpiece as a medium, a capstan, a pinch roller that presses the capstan, and a a cutter turning mechanism consisting of a rotor having at least one canter 7 on its circumference and a motor for driving the rotor; and a collection box provided below the cutter rotating mechanism, and when the rotating cutter approaches the wire electrode inserted between the capstan and the pinch roller, the power supply A wire electrical discharge machining device characterized in that the wire electrode is cut by a spark emitted by a high positive voltage applied by the device, and falls into the collection box and is accumulated. (2) For cab and stun drive. Depending on the rotation speed of the motor,
The wire electrical discharge machining apparatus according to claim 1, further comprising a control device for increasing and decreasing the rotational speed of the cutter drive motor.