JPS59102528A - Spark erosion machine for wire-cut - Google Patents

Abstract

PURPOSE:To make a positioning guide approach to a work in order to enhance the accuracy of machining, by providing the positioning guide movably in a nozzle holder surrounding a wire electrode, and as well by providing a nozzle axially movably to the tip end of the nozzle holder. CONSTITUTION:There is provided a nozzle holder 5 surrounding a wire electrode 2 in a wire-cut spark errosion machine and having at its tip end attached with an axially movable nozzle 7. A guide holder 6 and a positioning guide 61 which may be moved in the axial direction of the holder 5 and in a plane orthogonal to the axis of the holder 5, are disposed in the holder 5. Working liquid fed into the guide holder 5 is jetted to an electrical communication element 14 and a working gap 3A to carry out cooling and machining. Upon machining, the positioning guide 61 is approached to a work 3, thereby the accuracy of machining may be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire-cut electric discharge machining apparatus, and more particularly to a wire-cut electric discharge machining apparatus in which a positioning guide for a wire electrode can be moved.

A wire-cut electric discharge machining device moves a wire electrode in the axial direction between a pair of processing part positioning guides arranged at a distance, and moves the workpiece from a direction perpendicular to the axial direction of the wire electrode with a minute gap. The wire electrode and the workpiece are made to face each other through the workpiece, and the machining fluid is sprayed and supplied from a machining fluid jet nozzle disposed coaxially with the wire electrode and facing each other in the gap on one or both sides of the workpiece. Intermittent voltage pulses are applied during the process, machining is performed by the generated electrical discharge, and relative machining feed is applied to the wire electrode and the workpiece on the plane in the orthogonal direction, thereby cutting and cutting out the desired contour shape. It was designed so that the following was carried out. The closer the machining fluid injection nozzle is to the workpiece, the more effective it can be expected for cooling and removing machining debris. It is also necessary to supply and cool the energized rollers or energized bottles that are in sliding contact with the wire electrode on both sides of the workpiece that are further away from the workpiece than the guide. Various types have been proposed, such as an integrated type in which one or both of a positioning guide and an energizing bottle are housed in a machining fluid nozzle that is coaxial with the machining fluid nozzle. The configuration was complicated. In addition, for this reason, as long as it is not possible to provide a separate cooling means for the positioning guide, energizing bottle, etc., or providing a cooling means by separately supplying machining fluid, it is necessary to It was not possible to independently install a machining liquid nozzle close to the workpiece. Therefore, there are significant restrictions on the alignment of the components of the machining fluid nozzle positioning guide and the energizing bottle, their mutual positional relationships, etc., and the intended machining may be hindered. Particularly in the case of positioning guides for wire electrodes, in order to accurately process the workpiece into the desired shape, the positioning guide must be brought close to the workpiece and the deviation between the position set by the guide and the actual machined part must be adjusted. It is desirable to minimize. However, it is difficult to provide both the positioning guide and the nozzle close to the workpiece and to configure the guide so that the machining fluid is supplied to the guide. In addition, it is desirable to install the current-carrying bottle as close to the workpiece as possible to prevent the wire electrode from being heated by the electric discharge pulse of electric discharge machining, but it should be placed in sliding contact with the wire electrode at a position farther away from the workpiece than the positioning guide. In this case, if the positioning guide is configured to allow movement adjustment, further ingenuity will be required in the configuration and arrangement of the energizing bottle.

The present invention has been made in view of the above-mentioned conventional circumstances, and includes:
An object of the present invention is to provide a wire-cut electrical discharge machining device having a novel configuration in which a positioning guide for a wire electrode is housed and held in a nozzle that spouts machining fluid, and the guide can be adjusted and moved within the nozzle. .

The present invention will be explained below with reference to the illustrated embodiments.

FIG. 1 shows an enlarged view of the upper nozzle and positioning guide portion of a wire-cut electric discharge machining apparatus according to an embodiment of the present invention. The wire-cut electric discharge machining apparatus is unwound from a reel provided in a column or the like of the apparatus main body (not shown) via a brake roller, etc., extends downward via a guide roller 11 of an arm 1, and is disposed downwardly facing the arm 1. There is an intermittent gap between the guide roller of the provided arm (not shown), the winding roller and the part of the wire electrode 2 that reaches the take-up reel of the main body, such as the column, or the collection container, and the workpiece 3. Electric discharge machining is performed by applying voltage pulses. The upper part of a support member 13 is attached to the arm 1 disposed above so as to be substantially orthogonal to the arm 1 and can be vertically moved and positioned by a manual handle or a motor 12. At the bottom of the support member 13, there is a movable body 4 that can be moved and positioned in a plane orthogonal to the direction of movement of the support member 13 with respect to the arm 1 manually or by a motor 13A.
A wear-resistant energizing pin 14 made of cemented carbide or the like is attached to the front surface of the moving body 4 to apply a voltage pulse by contacting the wire electrode 2.
The wire electrode 2 is in contact with the wire electrode 2 in a substantially straight line between the two electrodes. Further, the upper end of a hollow cylindrical nozzle holder 5 is fixed to the movable body 4 at the lower end of the support member 13. Openings 51 and 52 are formed in the upper and lower end surfaces of the nozzle holder 5, and the width between the guide rollers 11 is formed approximately at the central axis of the nozzle holder 5 in these openings 51 and 52. They are arranged in such a positional relationship that the electrode 2 is inserted therethrough. Furthermore, a cylindrical guide bolt 6 of an upper positioning guide 61 is coaxially inserted into the inside of the nozzle holder 5, and a nozzle 7 is coaxially disposed in the lower end face opening 52 and is movable in the axial direction. It is fitted. The guide boulder 6 is a hollow body having a hole 6a, and a dice-shaped positioning guide 61 is attached to the lower end thereof, and the wire electrode 2 is positioned above the workpiece 3 by this guide 61. Li! is provided outside the nozzle holder b at an appropriate position such as the upper end of the guide holder 6. i strain or electrostrictive vibrator 80;
The resonant horn 81 attached to this is fixed to the tip of the resonant horn 81 of the vibrator 80.
By being attached to the support member 13, the guide holder 6 is positioned and held at a predetermined position within the nozzle holder 5. Thus, the vibrator 80 can be moved up and down in the axial direction of the wire electrode 2 in the same manner as the member 13 manually or by the motor 83 via the shaft 82 to the lower end of the support member 13. Furthermore, a shaft 82 is attached to the lower end of the shaft 82 manually or by motors 84 and 85.
A tee 786 is provided which is positioned and moved in the X-axis and Y-axis directions, which are orthogonal to the two movement axes, and the vibrator 80 is positioned and fixed on this tape. Further, the nozzle 7 is arranged at the lower part of the nozzle holder 5, and is fitted into the opening 52 at the lower end of the nozzle holder 5 so as to be able to move up and down according to the supply pressure flow rate of the machining fluid, the distance from the workpiece 3, etc. ing. The nozzle 7 is a hollow cylindrical body having a desired axial length, inner diameter, and axial inner diameter restriction, and the outer diameter of the end 71 of the flange portion located inside the nozzle holder 5 is equal to the opening at the lower end of the nozzle holder 5. The nozzle 7 is prevented from falling off from the nozzle holder 5 by having the end portion 71 fitted and abutted against the inner wall of the opening portion 52 .

A pressurized machining fluid supply hose 53 is attached to an appropriate position on the upper side of the nozzle holder 5, from which the machining fluid is supplied, and from the lower nozzle 7 to the machining portion l\ of the workpiece 3 and the frontage portion. 51 spouts machining fluid into the energized bottle 14,
The positioning guide 61 is cooled inside the nozzle holder 5, and furthermore, on the side of the nozzle holder 5,
A vertically elongated window 54 is formed so that the small horn 81 of the vibrator 80 can move relatively freely in the axial direction of the shaft 82 and by a small distance in the direction perpendicular to the plane of the paper. On the inside or outside of the nozzle holder 5, a multi-stage Oitke cover 55, which is used as a seal backing made of flexible soft rubber, a telescopic bellows, or a guide surface cover for a machine tool, is provided. This prevents machining fluid from leaking and scattering. Further, the workpiece 3 is fixed to a processing table 31, and the processing table 31 is connected to a motor 32.
33 to numerically control the plane perpendicular to the two axes of the wire electrode]
It can be freely moved along a predetermined contour shape under the control of the device. Note that many of the configurations and members described above are provided not only above the workpiece 3 but also below the workpiece 3. The explanation will be omitted because it is the same as the above explanation except that each member is arranged so that the upper and lower sides are symmetrical with the center at the center. may be fixed, and ultrasonic vibration may be applied to only one side of the upper part, so these related components can be omitted at the lower part, and ultrasonic vibration is essential. Because it is not
This portion can be simply a mechanical positioning guide holder holding structure.

Next, the operation of the wire-cut electrical discharge machining apparatus of the present invention will be explained. It is desirable that the machining fluid supplied near the machining part of the workpiece 3 be jetted from a close distance to the workpiece 3, but since the thickness of the workpiece 3 is not constant, It is necessary to adjust the nozzle 7 that supplies machining fluid up and down according to the movement, and this adjustment can be done by vertically moving the nozzle holder 5 to which the nozzle 7 is attached. It is done by doing. Note that if the vertical adjustment height is small, the nozzle 7 can freely protrude and go in and out of the nozzle holder 5, so the height may be adjusted only by protruding and going in and out of the nozzle 7.

The nozzle 7 receives the pressure of the machining fluid at its flange and is pushed toward the workpiece 3, and the machining fluid is ejected to the outside from between the nozzle tip and the workpiece 3, so the machining fluid pressure and The machining fluid is maintained at a position where the ejection force is balanced, and the machining fluid can be effectively supplied into the machining gap 3A between the wire electrode 2 and the workpiece 3. The energizing bottle 14, which is in sliding contact with the wire electrode 2 and is energized, is suitably cooled by spraying the separation jet processing liquid from the upper opening 51 of the nozzle holder 5, and the wire electrode 2 is fused at the energizing bottle 14. etc. l! lFi
Prevents line generation. In addition, the wire electrode 2 that processes the workpiece 3 needs to be accurately positioned in order to obtain the desired processed shape, and the guide 61 that positions the wire electrode 2 The closer it is to thing 3, the better.

In order to bring the guide 61 closer to the workpiece 3, move the shaft 82 toward the workpiece 3 by manual operation or by operating the motor 83.
The vibrator 80 and the guide holder 6 may be moved toward the workpiece 3 side. For this reason, the guide 61 is configured to be inserted into the nozzle 7 near the workpiece 3. On the other hand, due to this configuration, sufficient machining fluid is also supplied to the guide 61, and the guide 61 and the wire electrode 2 It is possible to cool the contact area with the Furthermore, the vibrator 80 to which the guide holder 6 is attached can be moved by a minute distance a in the front, back, left, and right planes, and the position of the guide 61 can be finely adjusted.

Further, the vibrator 80 to which the guide holder 6 is attached can be operated by operating the electrostrictive vibrator 80 to generate a resonant horn 8.
1 to vibrate the guide holder 6 and the guide 61,
The structure is such that vibration can be applied to the wire electrode 2. However, as mentioned above, if you want to perform wire cut electrical discharge machining without applying vibrations such as ultrasonic waves to the wire electrode 2, or if it is not necessary to apply vibrations, machining can be performed with the vibration of the vibrator 80 stopped. Alternatively, the vibrator 80 and the bone 81 may be replaced with a connecting and holding member such as a column having desired rigidity.

As explained above, according to the structure of the machining fluid nozzle holder section of the present invention, the guide for positioning the wire electrode can be inserted into the nozzle that supplies the machining fluid.
The wire electrode can be positioned accurately and positioned closer to the workpiece, improving machining accuracy, and since the guide is sufficiently supplied with machining fluid, there is no gap between the wire electrode and the guide. On the other hand, the machining fluid is sufficiently and accurately sprayed as a cooling fluid to the energizing bottle portion for the wire electrode, which is effective in preventing wire electrode breakage.

[Brief explanation of drawings]

FIG. 1 is a side view of a main part of a wire-cut electric discharge machining apparatus, with a part thereof cut in cross section, showing an embodiment of the present invention, and FIG. 2 is a side view showing the operation of the apparatus of FIG. 1. 2...Wire electrode, 5...Nozzle holder, 7...Nozzle, 61...Guide, Applicant: Inoue Japanx Institute Co., Ltd. Agent Patent attorney 1) Takeo 164 Figure 1 Figure 2

Claims (1)

[Claims] 1. In a wire-cut electrical discharge machining device that performs electrical discharge machining by applying intermittent voltage pulses between a workpiece and a wire electrode, a machining fluid is supplied inside the wire electrode, and a machining fluid is supplied inside the wire electrode. a hollow nozzle holder that passes through the nozzle holder in the axial direction; a nozzle that is attached to the tip of the nozzle holder so as to be movable in the axial direction and that sprays and supplies machining fluid into the machining gap of the workpiece; a positioning guide for the wire electrode, which is movably provided so as to be inserted into the nozzle on the workpiece side; A wire-cut electrical discharge machining apparatus characterized by having a current-carrying current that contacts and energizes the wire electrode provided opposite to the upper opening from which liquid is ejected.