JPH058123A - Wire electric discharge machining apparatus - Google Patents

Abstract

PURPOSE:To provide a wire electric discharge machining apparatus for removing a coiling tendency of a wire electrode caused by a supply bobbin and for advancing smoothly the electric discharge machining by means of simple constitution. CONSTITUTION:This apparatus is provided with a supply bobbin around which a wire electrode 1 used for electric discharge machining is wound, and roller type wire correcting means 15 consisting of two continuous units 15', 15'' in the same structure having roller guides consisting of a plurality of grooved roller groups 15e, 15'f and opening and closing mechanisms for moving the roller guides away from and toward a travelling path of the wire electrode 1 by the rotation of cam lock lever 15'b in the direction orthogonal to the opening and closing direction of the mechanism. The deformation of the wire electrode 1 supplied from the supply bobbin is removed by the roller type wire correcting means 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire electric discharge machine for performing electric discharge machining while supplying a machining liquid to a minute gap between a wire electrode and a workpiece, and particularly to winding of the wire electrode by a supply bobbin. The present invention relates to a wire electric discharge machine that corrects a habit and performs electric discharge machining.

[0002]

2. Description of the Related Art FIG. 3 is a schematic diagram showing a conventional wire electric discharge machine.

In the figure, 1 is a wire electrode, 2 is a supply bobbin around which a wire electrode 1 to be supplied to a discharge part is wound, 3 is connected to an electromagnetic brake 3a, and the wire electrode 1 is
The brake rollers 4a to 4c that apply a predetermined tension to the idler are idlers that change the traveling direction of the wire electrode 1. 5 is an upper guide for positioning which also functions as a current carrying member, 6 is a lower guide for positioning which also functions as a current carrying member, 7 is an upper nozzle for ejecting the machining liquid 10, and 8 is also ejecting the machining liquid 10. The upper nozzle 5 is provided inside the upper nozzle 7, and the lower guide 6 is provided inside the lower nozzle 8. Reference numeral 9 is a pump for supplying the working liquid 10 to the upper nozzle 7 and the lower nozzle 8. Reference numeral 11 is a pulse power supply unit that supplies a pulse for electric discharge machining, 12 is a work piece that is a target of electric discharge machining, and the work piece 12 is processed by an electric discharge generated between the work piece 12 and the wire electrode 1. To do. Reference numeral 13 denotes a wire feed roller that draws out the wire electrode 1 used for electric discharge machining from the electric discharge portion. The wire electrode 1 is collected in a wire collection box or the like via the wire feed roller 13. 14
Is a well-known automatic wire connecting machine for connecting the wire electrode 1 and supplying it to the discharge part when the wire electrode 1 is broken.

Next, the machining operation by this wire electric discharge machining apparatus will be described. First, a pulse voltage is applied between the wire electrode 1 and the workpiece 12 while ejecting the machining liquid 10 onto the wire electrode 1. As a result, in the minute gap where the wire electrode 1 and the supply bobbin 2 face each other, the workpiece 1 is heated by the thermal energy at the time of discharge accompanying the vaporization and explosion of the machining liquid 10.
2 melts and scatters. Further, the relative movement between the wire electrode 1 and the work piece 12 for keeping the minute gaps facing each other constant and continuously performing the electric discharge is usually carried out by numerically controlling an XY cross table (not shown). It is done by. In this way, the electric discharge is repeated and the XY cross table (not shown) is controlled, whereby the workpiece 12 is processed.
Machining grooves are continuously formed in the workpiece, and the workpiece 12 can be machined into an arbitrary shape. Further, when the wire electrode 1 is broken during machining between the discharge electrodes, the wire electrode 1 is reconnected by the automatic wire connecting machine 14 and the wire electrode 1 is supplied again between the discharge electrodes to perform electric discharge machining. ..

At the time of this electric discharge machining, the wire electrode 1 is successively drawn out from the supply bobbin 2 and used for electric discharge machining.
However, in the conventional wire electric discharge machine, the wire electrode 1 is carried from the manufacturer in a state of being wound on the supply bobbin 2, and the supply bobbin 2 is directly attached to the electric discharge machine to supply the wire electrode 1 to perform the electric discharge machining. Since the winding bobbin 2 has a winding tendency on the wire electrode 1 and the wire electrode 1 is broken, the connection failure rate by the automatic wire connecting machine 14 is high. For this reason, in order to obtain the wire electrode 1 in which no winding habit remains, for example, the wire electrode is subjected to wire drawing and is then purified at a low temperature, or the wire electrode has a high spring property by adding an additive element to the wire electrode material. 1 has been manufactured and various ideas have been made.

Although not directly related to the method of reducing the winding habit of the wire electrode 1, a technique for imparting a special deformation to the wire electrode 1 to enhance the recoverability is disclosed in, for example, Japanese Patent Laid-Open No. 57-
As disclosed in Japanese Patent No. 62829, there is a method in which a used belt electrode 1 is permanently deformed by a grooved belt.

[0007]

In the conventional wire electric discharge machine as described above, the wire electrode 1 is manufactured by the manufacturing method or the wire electrode material is specially designed so that the winding bobbin 2 may have a winding tendency. The automatic wire connecting machine 14 was used so as not to remain, and the success rate of connection was increased.

However, in recent years, the wire electrode material has been gradually changed from the conventional single wire mainly made of brass to various composite wires depending on the processing application, and in these composite wires, the supply bobbin 2 rather than the single wire is used. Tend to remain, and the success rate of connection by the automatic wire connection machine 14 tends to decrease. Therefore, the breakage of the wire electrode 1 during machining may increase the frequency of interruption of the electric discharge machining, and the electric discharge machining work may not proceed smoothly, and this improvement has been desired.

Therefore, the present invention has a simple structure,
It is an object of the present invention to provide a wire electric discharge machine that removes the winding tendency of the wire electrode 1 caused by the supply bobbin 2 and that makes electric discharge machining smoothly.

[0010]

A wire electric discharge machine according to the present invention is a supply bobbin around which a wire electrode used for electric discharge machining is wound, and a groove for removing deformation of the wire electrode supplied from the supply bobbin. A plurality of roller guides having the above and a roller type wire straightening means having an opening / closing mechanism for the roller guides.

[0011]

In the wire electric discharge machine of the present invention, the deformation of the wire electrode supplied from the supply bobbin is removed by the roller type wire straightening means having a plurality of roller guides having grooves and an opening / closing mechanism for the roller guides. Therefore, the winding tendency of the wire electrode due to the supply bobbin does not remain.

[0012]

EXAMPLES Examples of the present invention will be described below.

FIG. 1 is a layout view showing a roller type wire straightening means portion of a wire electric discharge machining apparatus according to an embodiment of the present invention, and FIG. 2 is a roller type wire straightening apparatus for a wire electric discharge machining apparatus according to an embodiment of the present invention. It is explanatory drawing explaining operation | movement of a means. In the figure, the same reference numerals and symbols as those of the steam conventional example indicate the same or corresponding components as those of the conventional example.

In the figure, 15 is a roller type wire straightening means for removing the deformation of the wire electrode 1.
Is inserted between the idler 4b and the automatic wire connecting machine 14 and is composed of two continuous units 15 'and 15 "having the same structure.
The two units 15 'and 15 "are in a positional relationship such that the opening and closing directions are orthogonal to each other. 15'a is a motor for opening and closing the first unit 15' of the roller type wire straightening means 15 and 15'b.
Is a cam lock lever rotationally driven by a motor 15'a, 15'c and 15'd are roller bases of the unit 15 ',
15'e and 15'f are a group of rollers having a predetermined groove rotatably mounted on the roller bases 15'c and 15'd.
The groove is set to have a U-shape, a V-shape, a concave shape, or the like so as to be guided to a width region designated by a predetermined taper. Reference numerals 16a and 16b denote visual sensors for confirming whether or not the wire electrode 1 is traveling correctly inside the guide roller of the roller-type wire straightening means 15, and are arranged between the idler 4b and the roller-type wire straightening means 15. It is set up. The configuration other than the roller-type wire straightening means 15 is the same as that of the above-mentioned conventional example, and the machining operation by this wire electric discharge machining apparatus is also the same, so the description thereof is omitted here.

Next, the relationship between the opening / closing operation of the first unit 15 'of the roller type wire straightening means 15 and the traveling operation of the wire electrode 1 will be described with reference to FIG. Wire electrode 1
In order to pass the roller type wire straightening means 15 through the roller type wire straightening means 15, first, the roller type wire straightening means 15 in the closed state as shown in FIG. 2A is moved to the cam lock lever 15 ′ as shown in FIG. 2B. Rotating b, two roller bases 1 facing each other
5'c and 15'd are separated from the wire traveling path in the left and right directions, and two roller bases 15'c and 15'd are provided with a roller group 1
The state between 5'e and 15'f is released. Then, the wire electrode 1 is passed between the two roller groups 15′e and 15′f in the released state, and then the cam lock lever 15′b is different from the above (b) as shown in FIG. Rotate in the opposite direction,
The two roller stands 15'c, 15'd are closed from both left and right directions of the wire traveling path, and the roller groups 15'e, 1 of the two roller stands 15'c, 15'd facing the wire electrode 1 are formed.
Insert between 5'f. As a result, the wire electrode 1 is sandwiched by the roller type wire straightening means 15 and travels along a predetermined wire travel path. In addition, here, the roller type wire straightening means 15
The opening / closing operation of the first unit 15 ′ of the two units 15 ′, 15 ″ has been described. The opening / closing operation of the second unit 15 ″ is also synchronized with the first unit 15 ′. To do.

As the wire electrode 1 passes through the roller type wire straightening means 15 in this way, the deformation of the wire electrode 1 is eliminated, so that the winding bobbin 2 does not retain the winding habit of the wire electrode 1 and the wire electrode 1 is not deformed. The shape is corrected.
That is, the winding habit of the wire electrode 1 due to the supply bobbin 2 is removed by crushing by the roller groups 15′e and 15′f of the two orthogonal units 15 ′ and 15 ″, and the wire electrode 1 is linearly aligned with the electric discharge machining part. The curl rate of the combined electrode with a diameter of 0.3 mm was corrected from 3% to 0.6% as a result of the trial manufacture of a wire electric discharge machine. The curl rate referred to above is the ratio of the length of the wire electrode 1 having a length of 1 m taken out from the supply bobbin 2 and vertically hung down to the original length due to the winding habit, and therefore, during electric discharge machining. Even if the wire electrode 1 is broken, the success rate of connection by the automatic wire connecting machine 14 is increased, the frequency of interruption of machining is reduced, and the electric discharge machining work proceeds smoothly. Manufacturing method or wire Subjected to a special twist to the electrode material,
It is not necessary to prevent the winding tendency of the wire electrode 1 from remaining.
Further, the winding tendency of not only a single wire but also a composite wire can be removed, and various wire electrodes 1 according to processing applications can be dealt with.

In particular, in this embodiment, the roller type wire straightening means 1 is provided between the idler 4b and the automatic wire connecting machine 14.
5 is provided, the straightness of the wire electrode 1 which is lost due to the stress applied by the brake roller 3 or the like in order to give a proper tension to the idlers 4a to 4c and the wire electrode 1 is also recovered. Able and dramatically wire electrode 1
The success rate of automatic wiring will increase.

As described above, the wire electric discharge machine of this embodiment eliminates the deformation of the supply bobbin 2 around which the wire electrode 1 used for electric discharge machining is wound and the wire electrode 1 supplied from the supply bobbin 2. In order to achieve this, a roller guide including a plurality of roller groups 15′e and 15′f having a groove and an opening / closing for separating or closing the roller guide from the traveling path of the wire electrode 1 by rotation of a cam lock lever 15′b. The roller type wire straightening means 15 is composed of two continuous units 15 ', 15 "having the same structure and having a mechanism in which the opening and closing directions are orthogonal to each other.

That is, the wire electric discharge machine of this embodiment is
The roller type wire straightening means 15 removes the deformation of the wire electrode 1 supplied from the supply bobbin 2.

Therefore, the roller type wire straightening means 15
By passing the wire electrode 1 through
Is removed, and the winding bobbin 2 does not retain the winding habit of the wire electrode 1, and the shape of the wire electrode 1 is straightened. Therefore, even if the wire electrode 1 is broken, the wire automatic wire connecting machine 14 The success rate of wiring will increase, and the EDM work will proceed extremely smoothly. Further, it is not necessary to make a special twist on the manufacturing method of the wire electrode 1 or the wire electrode material so that the winding tendency of the wire electrode 1 does not remain, and as a result, the electric discharge machining cost becomes low and Since various wire electrodes 1 can be dealt with, the range of application is expanded.

[0021]

As described above, the wire electric discharge machining apparatus of the present invention is provided with a supply bobbin and a roller type wire straightening means, and has a plurality of grooved roller guides and a roller guide opening / closing mechanism. By removing the deformation of the wire electrode supplied from the supply bobbin by the wire-type wire straightening means, the winding habit of the wire electrode due to the supply bobbin does not remain, so even if the wire electrode is broken during processing, automatic wire connection The success rate of connection by machines etc. has increased,
The electric discharge machining work progresses extremely smoothly, and it is possible to deal with various kinds of wire electrodes without requiring any special device for manufacturing the wire electrodes, so that the electric discharge machining cost becomes low and the applicable range is expanded.

[Brief description of drawings]

FIG. 1 is a layout view showing a roller type wire straightening means portion of a wire electric discharge machine which is an embodiment of the present invention.

FIG. 2 is an explanatory view for explaining the operation of the roller type wire straightening means of the wire electric discharge machine which is an embodiment of the present invention.

FIG. 3 is a schematic configuration diagram showing a conventional wire electric discharge machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 wire electrode 2 supply bobbin 14 automatic wire connecting machine 15 roller type wire straightening means 15 ', 15 "unit 15'a motor 15'b cam lock lever 15'c, 15'd roller stand 15'e, 15'f roller group 16a, 16b Visual sensor

Claims (1)

Claim: What is claimed is: 1. A wire electrode used for electric discharge machining is wound in a wire electric discharge machine that performs electric discharge machining while supplying a machining liquid to a minute gap between the wire electrode and a workpiece. A wire discharge comprising: a supply bobbin; a plurality of roller guides having grooves for removing deformation of the wire electrode supplied from the supply bobbin; and a roller-type wire straightening means having an opening / closing mechanism for the roller guides. Processing equipment.