JPS6399129A - Machining liquid supply device for wire cut electric discharge machining - Google Patents

Abstract

PURPOSE:To make it possible to prevent the ingress of outside air into an electrode gap and avoid the break of an electrode wire by supplying machining liquid to the machining section, where wire cut electric discharge machining is performed, from an auxiliary nozzle through feeding and machining grooves. CONSTITUTION:An electrode wire 1 is lead to the machining position of a workpiece 2 through a live roller 5, brake roller 6, and die guide 9 and is taken back through a boat formed guide 10, capstan 7, and pinch roller 8, and the machining section is always supplied with machining liquid continuously or alternatively through nozzles 13 and 14. And the block 21 to which an auxliary nozzle 18 attached is made to position the feed 21a to the starting point of electric discharge machining and is firmly fixed to the side face of the workpiece 2 by a magnet chuck 20. And the machining liquid from a hose 17 is supplied to the machining groove 2b of the workpiece 2 through the nozzle 18 and a passage 21b. Thus, the ingress of outside air into an electrode gap can be avoided, and the electrode wire can be prevented from breaking.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a machining fluid supply device for wire-cut electric discharge machining.

[Conventional technology]

In wire-cut electrical discharge machining, the wire electrode is usually stretched in a straight line with an appropriate tension between a pair of electrode guides provided at the ends of two arms, and during machining one side is suspended. The TSh guide is made to run at a constant speed from one TSh guide to the other. The distance between the two electrode guides is usually several tens of cI, and the processing part to be cut of the workpiece is placed here, and during processing, the distance between the wire electrode and the workpiece, which are facing each other with a small machining gap, is placed here. A device that supplies machining fluid and applies intermittent voltage pulses between the two to generate electrical discharge, and then applies machining feed to the wire electrode or workpiece through numerical control, etc., thereby machining the contour of the desired shape. It is.

However, wire electrodes usually have a diameter of 0.02 to 0.0.
It is an extremely thin wire rod of about 3 mm, and the groove of the workpiece cut with this wire is 0.1 to 1. It is extremely narrow, about 1.0 mm.

[Problem that the invention seeks to solve]

However, when trying to supply machining fluid from both the upper and lower surfaces of the workpiece to the discharge gap along the wire electrode, the machining gap is in a high temperature state due to discharge, and decomposed gas bubbles from the machining fluid etc. The generated machining fluid is pushed toward the machining groove on the machined side, or rather, it obstructs the supply of machining fluid to the machining gap and around the wire electrode, and the discharge pressure caused by the discharge in the machining gap pushes the wire electrode toward the machining groove side. From the place where the machining gap is convex in an arc shape toward the machining groove side, the supplied machining fluid tends to flow toward the machining groove side, and this causes air discharge. This makes it easy to cause short circuits and wire electrode breakage accidents. For this reason, various methods of supplying machining fluid have been devised, but even these methods are often insufficient when the workpiece is thick.

The present invention has been made based on the above-mentioned simplicity, and its purpose is to prevent outside air from entering the machining gap, to easily and reliably supply machining fluid evenly, and to provide a uniform supply of machining fluid during electrical discharge machining. Prevents wire breakage 1! The present invention aims to provide a wire cut electric discharge machining method.

[Means for solving problems]

Therefore, in a wire-cut electrical discharge machining device that cuts a workpiece using a wire electrode, in addition to a device for supplying machining fluid to the machining section using a conventional method, the wire electrode is inserted through the machine at the start of machining. It consists of a block having a notch to cut, an auxiliary nozzle communicating with this notch, and a magnetic chuck fixed to this block. It is designed to supply machining fluid. As the machining progresses, the machining grooves are successively closed using permanent magnets, particularly flexible rubber magnets.

[Effect]

After the block is aligned with the processing start point of the workpiece, it is fixed to the workpiece using a magnetic chuck. Then, during electrical discharge machining, machining fluid is supplied from an auxiliary nozzle into the cut, and in addition to supplying machining fluid to the machining part using the conventional method, the machining fluid is evenly filled to prevent outside air from entering the machining gap.
Since the wire electrode is also sufficiently cooled, disconnection accidents can be prevented, and the machining current can be increased to improve the machining speed.

〔Example〕

Hereinafter, the details of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is an explanatory diagram showing essential parts of an embodiment of a machining fluid supply device for wire-cut electrical discharge machining according to the present invention, and FIG. 2 is a diagram of a machining fluid supply device to a machining section using a conventional method.

In FIG. 2, 1 is a wire electrode, 2 is a workpiece, 3 is an upper processing head supported by an upper arm (not shown),
4 is a lower processing head supported by a lower arm (not shown); 5 is an energizing roller; 6 is a brake roller; 7 is a capstan; 8 is a pinch roller; 9 and 10 are wire electrodes 1 in the processing section. 11 and 12 are machining liquid supply vibs for the upper and lower machining heads 3.4, and 13 and 14 are upper and lower machining liquid supply nozzles.

Although not shown in the figure, the workpiece 2 is attached to a processing table provided on a cross-slide table (not shown) with a clamp or the like, and the wire electrode 1 and the workpiece 2
Relative machining feed in the horizontal direction perpendicular to the axis of the wire electrode 1 in the figure is provided by driving and controlling the cross slide table with an NC device or the like according to a predetermined program.

During electrical discharge machining, the wire electrode 1 is pulled out from an electrode supply drum (not shown), passes through an energizing roller 5 and a brake roller 6, is placed at a machining position on the die guide 9 and the side surface of the workpiece 2, and is then moved to a boat-shaped guide. 10, a predetermined tension is applied by a capstan 7 and a pinch roller 8, and the material is collected by a collecting device (not shown). Also, in the machining part, a machining fluid supply device (not shown) supplies upper and lower machining fluid supply nozzles 13.14 via upper and lower machining fluid supply pipes 11.12.
The machining fluid is supplied continuously or alternately, and as shown, usually as a coaxial flow of machining fluid surrounding the wire electrode 1.

In FIG. 1 showing the present invention, 17 is a machining fluid supply hose, 18 is an auxiliary nozzle, and 21 is a block to which the auxiliary nozzle 18 is attached. A notch 21a is provided through which the wire electrode 1 is inserted, and this notch 21a and the auxiliary nozzle 18
It communicates with the flow path 21b. Therefore, this notch 21a also serves as a flow path 21b when the machining fluid flows, and on the other hand, the tip of the auxiliary nozzle 18 and the flow path 21b have widths and lengths that are adapted to this notch 21a. It is structured so that it can be communicated with. 20 is block 21
The magnetic chuck 20 is fixed to the
．． That is, the block 21 is attached to and detached from the side surface of the workpiece 2.

Since the present invention is constructed as described above, the notch 21a of the block 21 is aligned with the wire-cut electrical discharge machining starting point, and the block 21 is fixed to the side surface of the workpiece 2 by the magnetic chuck 20. Then, the machining fluid is sequentially supplied from the machining fluid supply device (not shown) to the machining groove 2b of the machined workpiece 2 via the machining fluid supply hose 11, the auxiliary nozzle 18, and the flow path 21b in the block 21, This is a wire cut electrical discharge machining process. Further, even if the machining liquid is supplied from the auxiliary nozzle 18W- to the machining section via the machining groove 2b according to the present invention, the machining groove 2b is open on the upper and lower surfaces of the workpiece 2, so that the above-mentioned Processing @2
Even if b is not bent much in the middle, as the machining progresses and the opening of the machining groove 2b increases, the machining liquid will be discharged to the outside from the lower opening in the middle, and it will become sufficient. The machining fluid cannot reach the machining section. Therefore, the present invention is designed to supply a sufficient amount of machining fluid to the machining section at all times by sequentially closing the openings of the machining grooves 2b on the upper and lower surfaces of the workpiece 2 as machining progresses. As a means for blocking it, it is possible to push a suitable viscous material such as clay into the openings on the upper and lower surfaces of the processed groove 2b, or to mix permanent magnets, powder, plates, pieces, etc. of permanent magnets. Alternatively, various kinds of internally installed rubber magnets may be sequentially attracted so as to close the openings on the upper and lower surfaces of the processing groove 2b, or permanent magnets or rubber magnets may be used, for example, in JP-A-57-149.1.
The machining groove 2 is supplied by an automatic supply means as described in Publication No. 19.
Various measures can be taken, such as closing the opening of b.

Since the present invention is constructed as described above, when the present invention is used, machining liquid fills the cut without a vortex layer during electrical discharge machining, and therefore, outside air does not enter into the machining gap, and aerial discharge is completely prevented. Since the wire electrode is also sufficiently cooled, disconnection accidents can be prevented, the machining current can be increased, the machining speed can be improved, and even thick plates can be easily cut.

The configuration of the present invention is not limited to the above embodiments,
In particular, the shape, attachment method, etc. of the auxiliary nozzle can be freely changed within the scope of the purpose of the present invention, and the present invention encompasses all of these.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the present invention, and FIG. 2 is a diagram showing an apparatus for supplying machining liquid to a machining section using a conventional method. 1...Wire electrode 2...Workpiece

Claims (3)

[Claims] (1) In a wire-cut electrical discharge machining device that cuts a workpiece using a wire electrode, in addition to a machining fluid supply device to the machining section using a conventional method, a cut through which the wire electrode is inserted at the start of machining, It consists of a block that has an auxiliary nozzle that communicates with this notch, and a magnetic chuck that is fixed to this block, and machining fluid is supplied from the auxiliary nozzle through the notch and machining groove toward the machining area where wire-cut electrical discharge machining is being performed. Machining fluid supply device for wire cut electrical discharge machining. (2) The machining fluid supply device for wire-cut electrical discharge machining according to claim 1, wherein the machining grooves are sequentially closed as machining progresses. (3) The machining fluid supply device for wire-cut electric discharge machining according to claim 1, wherein the machining groove is closed by a permanent magnet as machining progresses.