JPH01205931A - Connection of wire in wire electric discharge working machine - Google Patents

Abstract

PURPOSE:To surely connect a wire electrode with a lower nozzle in simple manners by sucking the working liquid from the lower nozzle, feeding the cut wire electrode towards a start hole on a workpiece. CONSTITUTION:A wire electrode 3 which is cut between an upper nozzle 15 and a workpiece W is sent towards a start hole 39 on the workpiece W by a pinch roller 13. Then, working liquid is supplied into a working tank 41, and the workpiece W is immersed, and the working liquid in the working tank 41 is aspirated by a pump through a lower arm 43 from a lower nozzle 17. A strong water stream directed downward to the start hole 39 on the workpiece W is generated in the working liquid by the aspiration. The wire electrode 3 which is sent out by the pinch roller 13 is sucked into a lower nozzle 7 through the start hole 39 by the water stream, and wire-connected with the lower nozzle 7.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a wire connection method for a wire electrical discharge machine.

(Conventional technology) In the cutting process of a workpiece using a wire electrical discharge machine,
When moving from one machining site to another, it is generally necessary to cut the wire electrode and insert the wire electrode into the start hole and lower nozzle of the other machining site, a so-called wire connection operation. Further, similar work is required if the wire is broken due to a short circuit or the like during processing.

An example of a wire connection method for a conventional wire electric discharge machine will be explained with reference to FIG. Wire electrode 3 of this wire electric discharge machine 1
is fed out from the wire supply bobbin 5, passes through the guide roller 7, brake roller 9, lift roller 11, pinch roller 13, etc., passes through the upper nozzle 15, reaches the workpiece W, and cuts the workpiece by pulsed discharge. From the nozzle 17, it passes through a travel path (not shown) and is wound onto a winding bobbin.

The wire connection device includes a clamp device 21 attached to the upper frame 19, an energizing device @23, a jet nozzle 25 provided in the upper nozzle 15, and the like. The clamp device 21 includes a reciprocating fluid cylinder 27, a support shaft 29, a motor 31, a clamp unit 33, and the like. When clamping the wire electrode, use the clamp unit 33.
is lowered by the reciprocating fluid cylinder 27 as shown by the two-dot chain line, rotated by the motor 31, and clamped by the clamper 35 so as to embrace the wire "iIi pole 3 from the side."

The energizing device 23 energizes the wire electrode 3 between the sliding contact built into the upper nozzle 15 and the clamper, and melts the wire electrode, and includes a variable resistor, a battery, a switch, and the like.

The jet nozzle 25 is attached to the upper nozzle 15 and serves to jet the machining fluid downward as a jet stream 37, push the wire electrode 3 into the starting hole 39 of the workpiece W by the force of the jet, and connect it to the lower nozzle 17. It is something.

Next, the wiring work will be briefly explained. When moving from one machining site to another, the wire electrode 3 is first clamped by the clamping device 21, and the wire electrode 3 is fused by the energizing device 23. Next, move the workpiece, position the new start hole 39 directly below the upper nozzle 15,
The wire electrode 3 is sent out by the pinch roller 13, and a high-speed jet stream 37 is ejected from the jet nozzle 25. The wire electrode 3 is pushed by this jet flow and passes through the three start holes of the workpiece, and is inserted into the lower nozzle 17 to complete the wire connection.

(Problems to be Solved by the Invention) As described above, in the conventional wire connection method, the wire electrode cut by a cutter or energization is sent out to a new starting hole, and is pushed in by a jet stream to penetrate the workpiece and connect it to the lower part. Since the workpiece must be inserted through the nozzle, the work is difficult when the workpiece is thick or when the workpiece is immersed. That is, in such a case, the force of the jet stream becomes relatively weak, so that insertion into the lower nozzle often fails. In addition, a nozzle and a machining fluid supply circuit for generating a jet stream are required, resulting in a problem that the apparatus becomes complicated.

This invention was created with a focus on such problems, and by sucking the wire electrode cut by a cutter or energization together with the machining fluid from the lower nozzle,
It is an object of the present invention to provide a method for easily and reliably connecting a wire to a lower nozzle.

[Structure of the Invention (Means for Solving the Problems)] In order to achieve the above object, the wire connection method of the present invention involves feeding out the wire electrode cut between the upper nozzle and the workpiece toward the starting hole of the workpiece, and , the workpiece is immersed in the machining liquid supplied to the machining tank, the machining liquid is sucked from the lower nozzle, and the wire electrode is connected to the lower nozzle.

(Function) The wire electrode cut between the upper nozzle and the workpiece is fed out toward the start hole of the workpiece, but on the other hand, the machining fluid is sucked from the lower nozzle, so a water flow passes through the workpiece from the start hole and toward the lower nozzle. occurs. The wire electrode is attracted by this water stream, is sucked into the workpiece through the starting hole, and is then introduced into the lower nozzle, making the wire connection extremely easy and reliable.

(Example) Next, an example of the present invention will be described based on the drawings. FIG. 1 is a detailed explanatory diagram of the present invention. That is, the wire electrode 3 is cut between the upper nozzle 15 and the workpiece W using a conventional cutting device (not shown) or the like. Next, the start hole 39 of the workpiece W is positioned directly below the upper nozzle 15 using an X, Y table (not shown), etc., and machining liquid is supplied to the machining tank 41 so that the upper surface of the workpiece W is submerged in water by about iQmm. Further, the upper nozzle 15 is set to be in contact with the water surface or in the vicinity thereof.

Next, when the machining fluid in the machining tank 41 is sucked from the lower nozzle 17 via the lower arm 43 by a pump (not shown) or the like, a strong water flow directed downward into the start hole 39 is generated. In this state, the wire electrode 3 is
When fed out, the wire electrode 3 is sucked into the lower nozzle 17 along this water flow, and the wire connection can be performed extremely easily and reliably.

[Effects of the Invention] As can be understood from the above description, the present invention has the structure set forth in the claims, so that by adding a simple device, it is possible to cut the wire by using a cutter or energization in the wiring work. The wire electrode can be connected to the lower nozzle very easily and reliably.

[Brief explanation of the drawing]

FIG. 1 is a detailed explanatory diagram of the present invention, and FIG. 2 is an explanatory diagram of a conventional wiring device. 1... Wire electric discharge machine 3... Wire electrode 13... Pinch roller 15... Upper nozzle 17... Lower nozzle 39... Start hole 41... Machining tank 43... Lower arm Agent Patent Attorney Yasuo Miyoshi Figure 1

Claims (1)

[Claims] The wire electrode cut between the upper nozzle and the workpiece is sent toward the start hole of the workpiece, and the machining liquid is supplied to the machining tank to immerse the workpiece, and the machining liquid is sucked from the lower nozzle, and the wire electrode is transferred to the lower nozzle. Wire connection method for wire electrical discharge machine.