JPH03239422A - Traveling device for wire of wire electric discharge machine - Google Patents

Abstract

PURPOSE:To easily absorb the fluctuation of the wire tension between a tension roller and feeding out reel for stabilization, by providing a moving type guide roller movably in the vertical direction between the tension roller and feeding reel arranged to transfer the wire used for electric discharge machining. CONSTITUTION:A wire tension T loosens at the moment a wire 27 is drawn out of a feeding reel 29 and fluctuates ceaselessly between a tension roller 33 and the feeding reel 29 according to the fluctuation of a winding speed or machining state. In this case the fluctuation of the tension of the wire 27 is absorbed and reduced by arranging a moving type guide roller 49 between the tension roller 33 and feeding reel 29. Also, the fluctuation of the wire tension between the upper and lower wire guides 51, 53 of an electric discharge machining part is also reduced by the reduction of the wire tension T, the wire traveling speed between wire guides 51, 53 is stabilized as well, the disconnection of the wire 27 is prevented and the working accuracy is improved.

Description

[Detailed Description of the Invention] [Object of the Invention (Industrial Application Field) The present invention relates to a wire running device for a wire electrical discharge machine,
More specifically, the present invention relates to a wire running device that absorbs fluctuations in wire tension generated between a tension roller and a delivery reel of a wire (wire electrode) used in electrical discharge machining.

(Prior Art) Conventionally, in a part of the wire running system of a wire electric discharge machine, the tension applied to the wire electrode was controlled between a tension roller and a winding roller. Also,
Only enough tension was applied between the tension roller and the delivery reel to prevent the wire from loosening. Note that a fixed guide roller was provided between the tension roller and the feed reel, but it was only for guiding the wire.

(Problem to be Solved by the Invention) By the way, this wire tension loosens the moment the wire is pulled out from the delivery reel, and due to fluctuations in the winding speed or processing conditions, etc., the wire tension may become loose between the tension roller and the delivery reel. It is unbearably changing. That is, due to this fluctuation, the wire is constantly being pulled and loosened. Further, the wire tension varies in the wire tension between the upper and lower wire guides of the electrical discharge machining section that processes the workpiece, and also varies the wire running speed between the wire guides, which may lead to wire breakage. Note that this also increases the vibration of the wire between the wire guides, which may lead to deterioration of processing accuracy.

In view of the above points, it is an object of the present invention to effectively solve the problems of the prior art, to have a simple structure, to absorb fluctuations in wire tension between the tension roller and the delivery reel, and to
It is an object of the present invention to provide a wire traveling device for a wire electric discharge machine that can improve machining accuracy.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a structure in which a tension roller and a feed-out reel, which are disposed to convey a wire used in electric discharge machining, are provided. A movable guide roller that is movable in the vertical direction is provided, the weight of this movable guide roller is approximately equal to the reaction force against the roller generated by the tension of the wire, and there is a gap between the tension roller and the delivery reel. This is a wire running device for a wire electric discharge machine that is configured to easily absorb fluctuations in wire tension that occur during

(Function) By employing the wire traveling device of the wire electric discharge machine of the present invention, a movable guide roller is provided between the tension roller and the delivery reel, which are arranged to convey the wire used in electric discharge machining. It is provided to be movable in the vertical direction, has a weight approximately equal to the reaction force against the roller generated by the tension of the wire, and absorbs fluctuations in the wire tension generated between the tension roller and the delivery reel. The structure is simple, and fluctuations in wire tension between the tension roller and the delivery reel can be easily absorbed and stabilized, and the processing accuracy can be improved.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 4 shows a schematic configuration diagram of a wire electrical discharge machine in which the present invention is implemented. The wire electrical discharge machine 1 includes a machining fluid receiver 5 on a base 3 and a column 7. A movable table 11 equipped with a work clamp 9 for fixedly supporting a workpiece W is supported above the machining liquid receiver 5 so as to be movable two-dimensionally in the X-axis direction and the Y16 direction.

An upper arm 13 is attached to the upper side surface of the column 7, and a slide 15 that moves up and down is attached to the tip of the upper arm 13 so as to be vertically adjustable. An upper nozzle holder 17 is attached to the lower end of the slide 15, and one upper machining fluid supply nozzle is attached to this upper nozzle holder 17.

Also, on the side near the bottom of the column 7, an upper arm 13 is provided.
A lower arm 21 is attached parallel to the lower arm 21 . At the tip of the lower arm 21, a lower machining fluid supply nozzle 23 is installed in a lower nozzle holder 25, facing one upper machining fluid supply nozzle.
It is attached through. The upper and lower machining fluid supply nozzles 19.23 serve to spray and supply machining fluid such as distilled water to the electrical discharge machining portion of the workpiece W, and also to guide and hold the wire 27 as an electrode.

Two delivery reels are rotatably mounted on the top of the column 7 to continuously supply fine wire 27 to the electrical discharge machining section.

As the wire traveling device 31, the wire 27 from the two delivery reels passes through a pair of tension rollers 33, a plurality of rotatable upper guide rollers 35 provided from the column 7 to the upper nozzle holder 17, and is supplied with upper machining fluid. The nozzle 19 is reached, and from this one upper machining fluid supply nozzle, it passes through the electrical discharge machining section of the workpiece W and reaches the lower machining fluid supply nozzle 23.

Further, the wire 27 is connected to a wire feed roller 37 made of high hardness, such as ceramics, which is provided on the lower nozzle holder 25, a conveyor belt 39, 41 that pinches and conveys the wire 27, and this conveyor belt. A collection box 4 installed on the side of the base 3 is connected to a wire ejection device 45 made of the same material as the feed roller 37 provided on the feed side of 39.41 and a winding roller (with brake M) 43.
It is discharged at 7.

Next, FIG. 1 shows a schematic explanatory diagram of a wire running device of the present invention. The wire traveling device 31 mainly includes a feed reel (with brake M) 29, a movable guide roller 41, a tension roller 33, a fixed guide roller 35, a wire guide 51, 53, and a wire discharge device 45.
The tension T applied to the wire 27 is absorbed and stabilized by a movable guide roller 49 disposed between the two delivery rules and the tension roll 33.

FIG. 2 is a sectional view of the movable guide roller shown in FIG. 1. A bearing 55 is fitted into the axis of the movable guide roller 49, and five gaps are secured between the movable guide roller 49 and the shaft 57 that supports the guide roller 49. Therefore, the guide roller 49 is movable in the entire circumferential direction by the amount of the gap 59,
It moves up and down on the running wire 27.

As shown in FIG. 3, a tension T is applied to prevent the wire 27 from loosening, and the weight W of the guide roller 49 is approximately equal to the reaction force F generated by the tension T of the wire 27. W-
At T, the guide roller 49 remains stationary. When the wire 27 becomes loose, the tension T becomes smaller and the reaction force F also becomes smaller. At this time, F<W, and the guide roller 49 descends. As the tension T increases, the reaction force F increases, and F>
At W, the guide roller 49 rises.

In this way, the wire tension T loosens at the moment the wire 27 is pulled out from the two delivery reels, and due to fluctuations in winding speed or processing conditions, etc., the wire tension T loosens between the tension roller 33 and the two delivery reels. Although it changes unbearably,
By disposing the movable guide roller 49, the wire 2
7 tension fluctuations are absorbed and reduced. In addition, due to the decrease in wire tension T, the upper and lower wire guides 5 of the electrical discharge machining section
The variation in wire tension between 1°53 is also reduced, the wire running speed between the wire guides 51 and 53 is stabilized, the wire 27 is prevented from breaking, and the processing accuracy can be improved.

Note that the present invention is not limited to the above-mentioned embodiments, but can be implemented in other embodiments by appropriate design changes.

[Effects of the Invention] As is already clear from the above description, the wire traveling device of the present invention has a wire traveling device that moves between a tension roller and a delivery reel that are arranged to transport a wire used in electrical discharge machining. A type guide roller is provided to be movable in the vertical direction, has a weight approximately equal to the reaction force to the roller generated by the tension of the wire, and absorbs fluctuations in the wire tension generated between the tension roller and the delivery reel. This effectively solves the problems of the prior art, replaces the traditional fixed guide roller, has a simple structure, easily absorbs and stabilizes the fluctuation of wire tension between the tension roller and the delivery reel, This has the effect of improving the machining accuracy.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram of the wire running device of the present invention, Fig. 2 is a cross-sectional configuration diagram of the movable guide roller shown in Fig. 1, Fig. 3 is an explanatory diagram of the operation of the movable guide roller, and Fig. 4 1 is a schematic configuration diagram of a wire electric discharge machine in which the present invention is implemented. 1... Wire electrical discharge machine 27... Wire 29... Delivery reel 33... Tension roller 39. 41... Conveyance belt 43... Winding roller Agent Person

Claims (1)

[Claims] A movable guide roller that is movable in the vertical direction is provided between a tension roller and a delivery reel that are arranged to convey the wire used in electrical discharge machining, and the weight of this movable guide roller is generated by the tension of the wire. A wire for a wire electric discharge machine, characterized in that the wire is made almost equal to the reaction force to the roller, and is configured to absorb fluctuations in wire tension generated between the tension roller and the feed reel. Traveling device.