JPH0430913A - Upper liquid supply device for wire-cut electric discharge machine - Google Patents

Abstract

PURPOSE:To prevent working liquid from dripping from an upper liquid supply device at the time of automatic wire electrode threading and so on, by providing the body of a nozzle device with an air duct to communicate an interior space in the body and exterior and by providing this air duct with a switching means. CONSTITUTION:When a piston rod 34 is moved up by a cylinder 33, a plug 31 is pushed up by the piston rod 34 opening the opening 35, which is blockaded by the plug 31. As a result, an interior space 3 communicates outside air through an air duct 30. In this case, when the plug 31 is pushed up by means of the piston rod 34 by actuating the cylinder 33, the interior space 3 communicates outside air through the air duct 30 having a large cross sectional area. As a result, the residual working liquid in a body 1 quickly flows down. This constitution eliminates the bad influence caused by the working liquid dripping from the main nozzle 20 at the time of the next automatic wire electrode threading and when giving the wire perpendicularity or positioning the end face of a workpiece.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention includes a shet nozzle that spouts machining fluid for regulating the direction of a wire electrode (hereinafter referred to as wire) having a wire guide in the center, and The present invention relates to a closed type upper liquid supply device for wire-cut electrical discharge machining, which is equipped with a main nozzle that spouts machining liquid such as water during machining.

(Prior art) A wire-cut electric discharge machining device expels machining fluid while pushing out the wire from the nozzle of the upper fluid supply device, fills the area around the wire with machining fluid, and then penetrates into the workpiece and drains the lower part of the wire. The wire is drawn out from a wire drawing device and processed by applying intermittent voltage pulses between the wire and the workpiece. In such a wire-cut electrical discharge machining device, the upper liquid supply device has a wire guide in the center, and when the work starts! Ir&! The wire is provided with a shet nozzle that spouts a direction regulating machining fluid for extruding the wire vertically during machining, and a main nozzle surrounding the shet nozzle that spouts machining fluid during machining.

(Problem to be solved by the invention) In such a wire-cut electrical discharge machining device, for high-speed machining, the spouting speed of machining fluid from the upper fluid supply device must also be high, and therefore, high-pressure machining is required. Because liquid is used, the body of the upper liquid supply device is also sealed.

For this reason, by spouting machining liquid for regulating the wire direction from the central shet nozzle, the machining liquid remaining in the body can be avoided when the wire is inserted vertically into the machining start hole of the workpiece. There was a problem that the dripping liquid from the main nozzle around the shet nozzle for a long time disturbed the jet flow from the shet nozzle, and there was a risk that the wire could deviate from the machining start hole.

In addition, the wire can be brought out vertically by touching the vertical surface of a reference flock set on the processing table, or the end surface of the workpiece can be brought into contact with the wire to find the position that will serve as the reference for processing. When performing end face positioning, there is a problem in that measurement errors occur due to machining fluid dripping from the main nozzle.

In view of the above-mentioned problems, an object of the present invention is to provide an upper liquid supply device for wire cut electrical discharge machining that is configured to prevent water from dripping from the upper liquid supply device during automatic wire insertion.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a jet nozzle that has a wire guide in the center and that spouts a machining fluid for regulating the wire direction, and a machining fluid that surrounds the jet nozzle during machining. In a closed-type upper fluid supply device for wire-cut electrical discharge machining, which is equipped with a main nozzle that spouts fluid, an air passage is provided in the body of the nozzle device to communicate between the inner cavity of the body and the outside, and the air passage is It is characterized by having an opening/closing means.

(Function) With the above configuration, the present invention opens the opening/closing means manually or automatically to open the internal space of the body to outside air before automatic wire insertion, vertical wire removal, or positioning of the end face of the workpiece. If necessary, outside air is forced into the inner cavity to drain all the machining liquid inside the body.

(Example) Fig. 1 is a longitudinal cross-sectional view showing an embodiment of the upper liquid supply device for wire-cut electric discharge machining according to the present invention, and Fig. 2 is a longitudinal sectional view showing an embodiment of the upper liquid supply device for wire-cut electric discharge machining according to the present invention.
It is an E sectional view. Reference numeral 1 designates the body of the upper liquid supply device, and the body 1 includes a central flock la, left and right blocks 1b and 1c air- and water-tightly combined with each other through sealing materials 2a, 2b, and 2C on the left and right sides of these blocks. Blocks 1a-l
The first upper block ld is fixed to the north face of the body l through a sealing material 2d, and the second upper block 1e is stacked thereon in an air-tight structure, and an inner cavity 3 is formed in the body l. A semicircular energizing piece 4a that contacts a wire (not shown) to supply electricity or a spare energizing piece 4 is placed in the inner space 3.
A wire is passed between the groove 6 provided in the central carbide column 4c and the current-carrying piece 4a, and the wire is energized. There is one energizing piece 4a on the energizing pieces 4a and 4b.
The wire is pressed against the bolt 9 by a bolt 9 or a flock 8 holding a saccite 7 for adjusting the force.

A wire guide 11 is fixed to the first upper flock 1d and attached to the upper surface of the wire insertion hole 10 of the flock 8 holding the saf guide 7, and the second upper flock le has a diameter of 0.5 to 0. A seal tie 13 having a wire insertion hole of about .7 mm and a guide tube 12 for guiding the wire coming out of the tie 13 to the wire guide 11 are attached.

At the center of the lower part of the center flock la is a circular block 1.
4 are attached to the circular block 14, a tie 15 for wire positioning, a conical shet nozzle 16 provided to surround the tie 15, and a holster for fixing the shet nozzle 16 and the tie 15 to the block 14. 17, and a guide tube 1 for guiding the wire to the tie 15.
8 is installed.

Further, a conical main nozzle 20 or a holder 21 is attached to the center of the lower part of the central block la so as to surround the jet nozzle 16 with a gap therebetween.

As shown in FIG. 2, the first and second upper blocks l
A machining fluid passage 23 for introducing machining fluid into the inner space 3 is provided in d and le, and a part of the machining fluid introduced into the inner space 3 passes through the groove 10 of the carbide column 4C. Most of the others pass between the energized pieces 4a and 4b, and the machining liquid passage 24 below them, and some of them pass through the guide tube 18 and the jet nozzle 16.
Most of the other part passes through the hole 25 and is ejected from the main nozzle 20.

In addition, in order to eject machining fluid from the jet nozzle 16 during automatic wire insertion, as shown in FIG.
The machining fluid passage 26 is provided in the floc 1 shown in FIG.
The machining fluid passage 27 is connected to the machining fluid passage 27 provided in
communicates with the interior of the shet nozzle 16.

Reference numeral 30 designates an air passage provided in the upper blocks ld and le in order to communicate the inner space 3 with outside air according to the present invention, and 31 represents a plug provided as an opening/closing means for communicating and blocking the air passage 30. The plug 31 is connected to the air passage 30 by the push spring 32.
The opening 35 of the opening 35 is always closed.

33 is a hydraulic or pneumatic cylinder for opening and closing the stopper 31;
The cylinder 33 is attached to the central block la. In the cylinder 33, when the piston rod 34 is moved upward by the supply of working fluid, the plug 31 is pushed up by the piston rod 34, and the plug 31 opens the previously closed opening 35, allowing the inner space 3 to connect with the outside air. They communicate through an air passage 30, and when the piston rod 34 is moved downward, the opening 35 is closed by the stopper 31 by the force of the push spring 32.

In this embodiment, the high pressure machining fluid is supplied to the machining fluid passage 23.
through the main nozzle 20 into the inner cavity 3 in the body l.
When moving to the primary machining after machining is performed while spouting from Since the main nozzle 2o communicates only through the main nozzle 2o, the machining fluid in the body 1 drips from the main nozzle 2o for a long time.

At this point, by operating the cylinder 33 and pushing up the plug 31 by the piston rod 34, the inner space 3 is communicated with the air passage 30 through a wide cross-sectional area, thereby removing the machining fluid remaining in the body l. Flowing down in a haze. Therefore, it is possible to eliminate the adverse effects caused by dripping of machining liquid from the main nozzle 20 when the wire is automatically inserted next time, when the wire is taken out vertically, or when the end face of the workpiece is positioned.

In the above embodiments, the machining liquid remaining in the body 1 is caused to flow down by simply communicating the air passage 30, or it is not only made to communicate with the air passage 30.

For example, as shown in FIG. 1, by forcibly introducing compressed air 38 from a compressor 37 or the like through the air passage 30 through the opening 35, the machining fluid 39 remaining in the lower part of the main nozzle 20, etc. is removed from the air flow. The remaining machining fluid can be expelled more quickly.

It goes without saying that various other changes and additions can be made to the embodiments described above without departing from the gist of the present invention.

(Effect of the invention) According to claim 1, upon transition of wire cutting work,
The machining fluid remaining in the body of the upper liquid supply device can be quickly discharged by communicating the inner cavity of the body with the outside, so it can be easily drained when automatically inserting the wire, vertically pulling out the wire, or being machined. Adverse effects due to dripping of machining fluid from the main nozzle when positioning the end face of the object (failure to automatically insert the wire due to bending during extrusion, failure to eject the wire vertically, machining errors due to measurement errors, etc.) ) can be eliminated and work setups can be done quickly.

According to claim 2, by providing an actuator in the opening/closing means of the air passage that communicates the inside of the body with the outside air, automatic opening/closing is possible, and there is no need to manually operate the opening/closing means, which is convenient in practice.

According to claim 3, the machining fluid can be discharged from the body more quickly.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the upper liquid supply device according to the present invention, and FIG. 2 is a cross-sectional view taken along the line EE in FIG. 1: Body, 2a to 2d: Seal material, 3: Inner space, 4a
, 4b: Energizing piece, 7: Sub guide, 10: Hole, 11:
Wire guide, 12. Guide cylinder, 13・Seal tie,
15: Tice, 16: Shet nozzle, 18: Horta,
20: Main nozzle, 21: Holter, 23.24: Machining fluid passage, 25: Hole, 26. 27: Jet nozzle jet machining fluid passage, 30: Air passage, 31: Plug, 32: Pressing spring, 3
3: Cylinder, 34゛Piston rod, 37: Compressor clock applicant Jappax Co., Ltd.

Claims (1)

[Scope of Claims] 1. A closed type comprising a jet nozzle having a wire guide in the center and spouting machining fluid for regulating the direction of the wire electrode, and a main nozzle surrounding the jet nozzle and spouting machining fluid during machining. In the upper fluid supply device for wire-cut electric discharge machining, the body of the nozzle device is provided with an air passage that communicates the inner space of the body with the outside, and the air passage is provided with an opening/closing means. Upper liquid supply device for cut electrical discharge machining. 2. The upper fluid supply device for wire-cut electrical discharge machining according to claim 1, wherein the opening/closing means includes an actuator for automatic opening/closing. 3. The upper liquid supply device for wire-cut electric discharge machining according to claim 1 or 2, further comprising an air supply device for introducing outside air into the inner space of the body through the opening/closing means.