JPH06155168A - Method and device for wire electric discharge machining - Google Patents

Abstract

PURPOSE:To improve productivity and workability by eliminating hand work performed in the case of exchanging a wire, and automatically switching wires of rough machining, finish machining, etc., during operation. CONSTITUTION:A workpiece 26 is automatically moved by a preset machining procedure to a plurality of adjacent wire electric discharge machining stages 12, 13 in which wires 14, 15 for performing electric discharge machining can be automatically mounted and removed relating to workpiece 26 of machining object, and the workpiece 26 is automatically machined by the respective wire electric discharge machining stages 12, 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire electrical discharge machining method and a wire electrical discharge machining apparatus used for the method, and more particularly, to eliminate the manual work performed when exchanging wires for rough machining and finish machining. TECHNICAL FIELD The present invention relates to a wire electric discharge machining method and a wire electric discharge machining device used for the same, in which wire switching is automatically performed during work to improve productivity and workability.

[0002]

2. Description of the Related Art Wire electric discharge machining is used as a means for performing fine machining such as a die for a lead frame used in a semiconductor device. As a conventional wire electric discharge machine, a wire having a predetermined diameter derived from a wire supply means is attached to a pair of wire guide means arranged above and below a wire electric discharge stage by a wire feeding means, and then the wire and the work It is known that a predetermined work such as roughing and finishing is performed by moving a work according to a set machining procedure and supplying a wire while applying a current between the two.

[0003]

However, in the conventional wire electric discharge machining, a wire having a relatively large diameter (for example, 0.
2 mm), after performing a finishing process with a wire having a relatively small diameter (for example, 0.1 mm), the wire for roughing, which has been mounted between the wire guide means, is cut midway. , Instead of the wire for roughing, a wire for finishing is attached to the wire supply means, and the wire guide means is replaced with one for finishing.
After that, the wire had to be drawn out from the wire supply means, drawn around to the wire feeding means, and then mounted between the new wire guiding means by the wire feeding means. The work of exchanging these wires and the wire guide means, for example, the vertical operation of the wire and the repositioning of the workpiece to the origin are performed by hand, and it takes time and labor to reduce the productivity and workability of wire electric discharge machining. There was a problem. The present invention has been made in view of such circumstances, eliminates the manual work performed when replacing the wire, and automatically switches the wire for roughing, finishing, etc. during the work to improve productivity and An object of the present invention is to provide a wire electric discharge machining method with improved workability and a wire electric discharge machining device used for the method.

[0004]

A method according to the above-mentioned object.
According to the wire electric discharge machining method described, a wire to be electric discharge machined is automatically attached to and detached from a plurality of adjacent wire electric discharge machining stages that can be automatically attached to and detached from a work as an object to be machined by a preset machining procedure. It is configured so that it is moved and the workpiece is automatically machined at each of the wire electric discharge machining stages. A wire electric discharge machine according to the above object is a pair of wire guide means for holding a wire for electric discharge machining at a machining position of a workpiece as a machining object, and the wire is automatically mounted on the pair of wire guide means. A plurality of wire electric discharge machining stages each having a wire feeding means for cutting and a wire cutting means for cutting the wire being fed into the work, and the work is moved between the wire electric discharge machining stages, and a machining procedure for the work. And a work moving means for moving the work.

[0005]

In the wire electric discharge machining method according to the first aspect of the present invention, in each wire electric discharge machining stage, a wire having a predetermined diameter is placed in a standby state for completion of attachment or automatic attachment, and machining is performed in accordance with a preset machining procedure. First, move the workpiece, which is the target object, to a specific wire electric discharge machining stage, perform a predetermined wire electric discharge machining there, and if necessary, automatically separate the wire on the wire electric discharge machining stage, and wire with different diameters in advance. The work is moved to another installed wire electric discharge machining stage, where the wire is automatically mounted on the work, and the work is moved according to the machining procedure as it is to perform the electric discharge of the wire. Since it is not necessary to replace the wire in the wire electric discharge machining stage, extremely efficient machining work becomes possible.
Next, in the wire electric discharge machine according to claim 2,
A pair of wire guide means for holding the wire to be electric discharge machined at the machining position of the work, a wire feeding means for automatically mounting the wire on the pair of wire guide means, and cutting the wire in the middle of feeding the work. Since a plurality of wire electric discharge machining stages each having a wire cutting means are provided, and further the work moving means for moving the work between the wire electric discharge machining stages and further moving the work according to a machining procedure, Wires with different diameters necessary for each wire electric discharge machining stage are installed in advance, and after performing electric discharge machining on one wire electric discharge machining stage according to the machining procedure, the work moving means is driven and another wire electric discharge machining is performed. The work is moved to the stage.In this case, each wire EDM stage has A wire cutting means is provided with the said wire feeding means, automatic mounting and automatic detachment of the workpiece is possible for the workpiece. Therefore, it is possible to automatically perform, for example, roughing or finishing of the work, and improve productivity and workability. Moreover,
Even though the workability is improved in this way, at the time of processing, the processing accuracy of the same level as the conventional one can be maintained.

[0006]

Embodiments of the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. 1 is a schematic view of a wire electric discharge machine to which an embodiment of the present invention is applied, FIG. 2 is a perspective view of a moving means of the work, and FIG. 3 is a plan view of the work.

First, the structure of a wire electric discharge machine according to an embodiment of the present invention will be described. As shown in FIG. 1, the wire electric discharge machining apparatus 10 includes a first machining stage 12 as an example of a wire electric discharge machining stage in both sides of a water tank 11.
And a second machining stage 13 as another example of the wire electric discharge machining stage. On both sides of the aquarium 11,
A pair of wire supply means 16 for supplying a relatively large diameter wire 14 for rough machining or a relatively small diameter wire 15 for precision machining to the first and second machining stages 12 and 13.
And a pair of wire guide means 17 arranged on the upper and lower parts of the first processing and second processing stages 12 and 13 by the jet water flow at the downstream of each wire supply means 16. A pair of wire feeding means 19 to be automatically attached to 18 is provided. Each wire feeding means 19 and the upper wire guide means 1
A cutting means 20 having a cutter 20a for automatically cutting the wires 14 and 15 is provided between the wires 7.

In addition, a wire 14 is attached to the lower portion of each lower wire guide means 18 by a guide pulley 21.
A pair of wire guide portions 22 for changing the feeding direction of the wire 15 to the horizontal direction are provided, and the wire 1 led out from each wire guide portion 22 is provided on both sides of the water tank 11.
A pair of wire collecting means 25 for collecting 4, 5 into the collecting box 24 by the collecting roller 23 is provided. As shown in FIG. 2, in the water tank 11, there is provided an XY table 27 for moving the end portion of the work 26, such as a lead frame die, in the XY direction while being clamped from the vertical direction by the clamper 27a. The work 26 is moved between the first processing stage 12 and the second processing stage 13 by the XY table 27. Next, the wire supply means 16 will be described in detail with reference to FIG. Here, the wire supplying means 16 on the side of the wire 14 for rough processing is illustrated, but the wire supplying means 16 on the side of precision processing 15 also has the same structure.

The wire 14 is wound around each bobbin 28, and three guide pulleys 29, a wire breakage detector 30, a brake roller 31, are sequentially provided on the downstream side of the bobbin 28.
A wire retainer 32 for preventing loosening of the wires 14 and 15 pulled obliquely upward from the brake roller 31, a guide pulley 33 arranged almost directly above the wire feeding means 19, a wire breakage detector 34, a gold mouth 35 and wire feeding. A feed roller 36 arranged near the means 19 is provided. The feed roller 36 is rotated to feed the wire 14 wound around the bobbin 28 into the wire feeding means 19 at a predetermined speed. In the figure, reference numeral 37 indicates a pulley and reference numeral 38 indicates a power transmission belt.

Next, a wire electric discharge machining method using the wire electric discharge machine 10 according to one embodiment of the present invention will be described. The wires 14 and 15 are led out from the bobbin 28 of the wire supply means 16 to the wire feeding means 19 of the first and second processing stages 12 and 13 in advance. As shown in FIG. 1, the work 26 is moved to the first machining stage 12 side by the XY table 27, and then the wire 14 is cut by the jetting water flow of the wire feeding means 19 on the first machining stage 12 side. The wire guide means 17, the processing hole 26a of the work 26, the lower wire guide means 18 and the wire guide portion 22 are fed all at once, and the wire 14 is mounted between the wire guide means 17 and 18 in a tensioned state. Then, while the wire guide means 17 and 18 are used as anodes and the work 26 is used as a cathode, electricity is applied to the wires 14 according to a preset processing procedure.
While moving the work 26, the wire 26 is subjected to wire electrical discharge machining of the relatively wide precision lead portion a shown in FIG. The processed wire 14 is sequentially collected by the collecting roller 23 into the collecting box 24.

When the rough machining is completed, the wire 14 is then cut by the cutter 20a of the cutting means 20 as shown in FIG.
It is moved to the processing stage 13. Then, as in the case of the wire feeding means 19 on the side of the first processing stage 12 described above, the wire feeding means 19 on the side of the second processing stage 13 removes the wire 15 for precision processing led out from the bobbin 28 by the jet water flow. , The wire guide means 1 in a state of being inserted into the notched lead portion a of the work 26.
It is mounted in a tensioned state between Nos. 7 and 18, and the work 26 is moved while supplying the wire 15 to perform precision machining of the narrow lead portion b shown in FIG. The exchange of these wires 14 and 15 is repeated to process each lead of the work 26.

After processing, the wire 15 is cut by the cutter 20a on the side of the first processing stage 12, the clamper 27a is loosened, and the work 26 is removed from the XY table 27. After that, when processing a new work 26, the new work 26 is attached to the XY table 27, and the operations of roughing and precision processing are similarly repeated. When the work 26 is to be cut inward from the outer edge of the work 26, the wire 14 is previously provided between the wire guide means 17 and 18 of the first and second working stages 12 and 13. , 15 attached, follow the processing procedure to X
Predetermined electric discharge machining can be performed simply by moving the Y table 27. That is, the cutting means 20 is used as needed.

As described above, since the wires 14 and 15 having a predetermined diameter are in the standby state for automatic mounting or in the mounting completed state in the first and second processing stages 12 and 13, the wires 14 and 15 can be mounted as needed. While performing automatic mounting, the work 26 can be moved between the stages 12 and 13 according to a preset machining procedure to perform electric discharge machining. As a result, conventionally, the wire 14 for rough machining together with the bobbin 28 must be replaced with the wire 15 for precision machining, and the wire 15 must be manually routed from the wire supplying means 16 to the wire feeding means 19. With this means, such work becomes unnecessary. Therefore, it is possible to automatically perform rough machining or precision machining of the work 26 during the work, thereby improving productivity and workability.
Moreover, despite the improved workability,
During processing, the same level of processing accuracy as before can be maintained. Further, the first processing and second processing stages 12, 13
Since the wire feeding means 19 is provided in each of the above, the wires 14 and 15 are connected to the wire guide means 17 and 18, respectively.
Can be installed automatically.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment and is included in the present invention without departing from the scope of the invention. For example, in the example,
Although two stages, the first machining stage and the second machining stage, are illustrated as the wire electric discharge machining stage, the present invention is not limited to this, and three or more stages may be provided.
Further, in the embodiment, wires having different diameters are shown as the wires to be arranged on the respective wire electric discharge machining stages, but without being limited to this, for example, when the other wire electric discharge machining stage is used as a spare stage, etc. like,
It is also possible to attach wires of the same diameter.

[0015]

According to the wire electric discharge machining method and the wire electric discharge machining apparatus used therefor of the first and second aspects of the present invention, in each wire electric discharge machining stage, a wire having a predetermined diameter is in a completed state or in a standby state for automatic mounting. Therefore, according to the preset machining procedure, the work is moved between the respective wire electric discharge machining stages, and the work is directly electric discharge machined by the attached wire, or the wire is automatically attached when the wire is in the standby state. By performing electrical discharge machining later, manual wire replacement, which was necessary in the past, is no longer necessary, which allows for automatic roughing and precision machining of workpieces during work, thereby improving productivity and work efficiency. You can improve the property. Moreover, in spite of the improved workability as described above, at the time of processing, it is possible to maintain the same level of processing accuracy as the conventional one. Particularly, in the wire electric discharge machine according to the second aspect, since the wire feeding means is provided in each wire electric discharge stage, a plurality of kinds of wires can be attached to the wire guide means.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a wire electric discharge machine to which an embodiment of the present invention is applied.

FIG. 2 is a perspective view of a moving means of the work.

FIG. 3 is a plan view of the work.

[Explanation of symbols]

 10 Wire Electric Discharge Machine 11 Water Tank 12 First Machining Stage (Wire Electric Discharge Machining Stage) 13 Second Machining Stage (Wire Electric Discharge Machining Stage) 14 Wire 15 Wire 16 Wire Supply Means 17 Wire Guide Means 18 Wire Guide Means 19 Wire Feed Means 20 Cutting means 20a Cutter 21 Guide pulley 22 Wire guide part 23 Collection roller 24 Collection box 25 Wire collection means 26 Work piece 26a Machining hole 27 XY table 27a Clamper 28 Bobbin 29 Guide pulley 30 Break detector 31 Brake roller 32 Wire retainer 33 Guide pulley 34 Disconnection detector 35 Gold port 36 Feed roller 37 Pulley 38 Power transmission belt

Claims (2)

[Claims] 1. A wire for electric discharge machining is automatically moved to a plurality of adjacent wire electric discharge machining stages that can be automatically attached / detached to / from a workpiece as a workpiece by a preset machining procedure. A wire electrical discharge machining method, wherein the workpiece is automatically machined at each of the wire electrical discharge machining stages. 2. A pair of wire guide means for holding a wire for electric discharge machining at a machining position of a workpiece as a workpiece, a wire feeding means for automatically mounting the wire on the pair of wire guide means, and A plurality of wire electric discharge machining stages each having wire cutting means for cutting the wire being fed to the work, and a work movement for moving the work between the wire electric discharge machining stages and further for moving the work according to a machining procedure. And a wire electric discharge machine.