JPS6236583Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a nozzle device for a wire-cut electric discharge machine, and more specifically, the nozzle is provided to be movable up and down, and the nozzle end is provided to be able to lightly contact the workpiece. There is something about a nozzle device.

2. Description of the Related Art A wire-cut electrical discharge machine is known that performs electrical discharge machining by applying a pulse current between a continuously supplied wire electrode and a workpiece. In such a wire-cut electrical discharge machine, the space between the wire electrode and the workpiece is kept extremely small, and in order to maintain accuracy, the space between the wire electrode and the workpiece is kept very small. It is desirable that the electrical discharge machining section) be maintained under constant conditions at all times. Therefore, conventionally, in order to remove minute machining debris generated by electrical discharge machining from the gap, a nozzle device is provided for injecting machining liquid such as pure water into the gap. There is. Since the conventional nozzle device is separated from the workpiece, most of the machining fluid is scattered on the surface of the workpiece, and only a small amount of the machining fluid flows into the interspace, which is an efficient way to dispose of machining waste. It was difficult to remove.

The present invention was devised in view of the above-mentioned conventional problems.The nozzle of the nozzle device is provided so that it can move up and down depending on the pressure of the machining fluid, and the nozzle end is provided so that it can freely contact the workpiece. To provide a novel nozzle device in which the contact pressure at the end is relatively small and there are no disadvantages caused by high contact pressure.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, a general wire-cut electric discharge machine 1 has a column 5 erected on a base 3, and an upper arm 7 and a lower arm 9 horizontally provided at the top and bottom of this column 5. The tips of the upper arm 7 and lower arm 9 are connected to the base 3.
It is provided facing the processing tank 11 provided above.
Wire guide devices 19 and 21 are provided at the tips of the upper arm 7 and the lower arm 9 to vertically guide the fine wire electrode 17 that is continuously supplied from the supply reel 13 to the take-up reel 15. . The upper wire guide device 19 is vertically adjustable. In this type of wire cut electric discharge machine, upper and lower wire guide devices 1
Electrical discharge machining is performed between the vertical part of the wire electrode 17 between the wire electrodes 9 and 21 and the workpiece (not shown) supported on the wire support stand 23 provided in the machining tank 11. Electrode 17
The machining fluid is supplied to the space between the workpiece and the workpiece (electric discharge machining section) by a nozzle device provided in one or both of the upper and lower wire guide devices 19, 21 as appropriate.

Next, the nozzle device according to the embodiment of the present invention will be explained in detail using FIG. 2.
5 is a lower arm 2 corresponding to the lower arm 9;
It is attached to the tip of the wire 7 and also serves as a lower wire guide device. A bracket 31 is detachably fixed to the tip of the lower arm 27 by a plurality of bolts 29 and is electrically insulated from the lower arm 27 by an insulator (not shown). A device 25 is mounted thereon, and a guide reel 33 for guiding the wire electrode 17 is rotatably mounted thereon.

The nozzle device 25 includes a support body 35 attached to the bracket 31 and the like.
A cylindrical portion 35a projecting upward is formed at the upper part of the support body 35, and a hollow portion 35b of an appropriate shape is formed inside. A wire guide 37 for guiding the wire electrode 17 is fitted into the hollow portion 35b of the support body 35. The wire guide 37 is fitted and fixed with an upper end 37a protruding from a cylindrical portion 35a of the support body 35, and has a vertical through hole 37b in the axial center thereof through which the wire electrode 17 can freely pass. The upper end portion 37a
A radial communication hole 37c is formed in the through hole 37b to communicate with the through hole 37b. A current-carrying body 39 that contacts the wire electrode 17 is attached inside the wire guide 37, and longitudinal grooves 37d are formed at a suitable number of locations on the outer circumferential surface.

Further, a guide presser 41 is screwed onto the support body 35. The guide presser 41 is screwed onto the support body 35 from above and below, and a sealing 43 is interposed between the end surface inside the hollow portion 35b and the bottom surface of the wire guide 37. A pipe-shaped current carrying body presser 45 is screwed into the axial center of the guide presser 41 . This current-carrying body presser 45 presses the current-carrying body 39 from below, and a terminal 49 connected to a current-carrying cable (not shown) via a nut 47 is attached to the lower end projecting downward from the guide presser 41. Therefore, the wire electrode 17 has
Terminal 49, current carrying body holder 45 and current carrying body 3
9, the current will be applied through the terminal 9.

Furthermore, the support body 35 has the hollow portion 35
A supply pipe 51 for supplying machining fluid into the interior of b is connected to the cylindrical portion 35 of the support body 35.
A movable cylindrical body 53 is fitted to the outer periphery of a so as to be vertically movable. This movable cylindrical body 53 is connected to the cylindrical portion 35.
A fixed cylindrical body 55 that surrounds and is attached to the support body 35
A pressure chamber 57 is formed between the movable cylindrical body 53 and the fixed cylindrical body 55. A circumferential groove 53a having an appropriate width is formed on the inner peripheral surface of the movable cylinder 53, and the circumferential groove 53a and the pressure chamber 57 communicate with each other via a communication hole 53b formed in the movable cylinder 53. Further, the circumferential groove 53a is formed in the cylindrical portion 35a of the support body 35.
It communicates with the hollow portion 35b via a communication hole 35c formed in the. A conical cylindrical nozzle 59 that injects machining liquid toward the machining portion of the workpiece W is screwed onto the upper part of the movable cylinder 53.

In the above configuration, when the machining fluid is supplied from the supply pipe 51 into the hollow portion 35b of the support body 35, the machining fluid passes through the groove 37d formed on the circumferential surface of the wire guide 37 and reaches the inside of the nozzle 59. A portion of the processing fluid is supplied to the communication hole 37 of the wire guide 37.
c, flows down through the through hole 37b, and flows into the current carrying body 3.
9. The current-carrying body presser 45 and the like are cooled and discharged downward.

A part of the machining liquid that has flowed into the nozzle 59 is ejected from the nozzle opening of the nozzle 59 toward the workpiece W. In addition, the flow of a part of the machining fluid is stopped by the conical cylindrical portion of the nozzle 59, resulting in an increase in pressure (dynamic pressure) and the pressure of the machining fluid. (nozzle opening) is brought into contact with the workpiece W. When the end of the nozzle 59 comes very close to the workpiece W, the distance between the end of the nozzle 59 and the workpiece W becomes narrow, and the nozzle opening becomes gradually narrowed. Therefore, the pressure inside the nozzle 59 gradually increases, and the machining fluid is jetted from the nozzle 59 to the electrical discharge machining section more vigorously than at the beginning.

Therefore, less machining fluid is scattered from between the nozzle end and the workpiece W, and machining fluid is sufficiently supplied to the electrical discharge machining section, improving the efficiency of removing machining debris from the electrical discharge machining section. can do.

Furthermore, when the nozzle 59 is raised as described above, the state shown in FIG. 35 from the communication hole 35c provided in the cylindrical portion 35a of the movable cylinder 53.
It flows into the pressure chamber 57 through the circumferential groove 53a and the communication hole 53b. As mentioned above, the nozzle 5 is
9 is rising, the pressure within the pressure chamber 57 is not so high, allowing the nozzle 59 to rise rapidly.

When the end of the nozzle 59 (nozzle mouth) approaches the workpiece W and the pressure within the nozzle 59 gradually increases as described above, the pressure within the pressure chamber 57 also gradually increases.

The pressure within this pressure chamber 57 gradually increases and acts on the piston portion of the movable cylinder 53, so that the movable cylinder 53 and the nozzle 59 are pressed downward. Therefore, the pressure increase (dynamic pressure) caused by the nozzle 59 blocking a part of the flow of the machining fluid and the force that causes the nozzle 59 to rise due to the action of the pressure of the machining fluid, and the pressure chamber In other words, the ratio of the pressure receiving area of the nozzle 59 to the pressure receiving area of the piston portion of the movable cylinder 53 in the pressure chamber 57, and the ratio of the force with which the nozzle 59 is lowered by the pressure in the pressure chamber 57, By appropriately setting the pressure and flow rate of the machining fluid, the nozzle 59
The contact pressure between the nozzle end and the workpiece W can be reduced (lightened). Therefore, there are problems caused by the large contact pressure between the workpiece W and the nozzle end of the nozzle 59, for example, the lower arm 27 is slightly bent due to the reaction force of the contact pressure, reducing the machining accuracy. Also, the friction between the nozzle 59 and the workpiece W will not increase and the movement and positioning of the workpiece W will not be deteriorated.

As can be understood from the above description of the embodiments, the gist of the present invention is as stated in the claims for utility model registration, and therefore it is possible to supply a large amount of machining fluid to the electrical discharge machining section of the workpiece. This makes it possible to efficiently remove machining debris from the machining section, and there is no problem caused by excessive contact pressure between the nozzle end of the nozzle and the workpiece.

Note that the present invention is not limited to the above-mentioned embodiments, but can be implemented in other forms by making appropriate changes. For example, it is also possible to reverse the positional relationship between the movable cylinder and the fixed cylinder.

[Brief explanation of the drawing]

FIG. 1 is a front view of a general wire-cut electric discharge machine, and FIG. 2 is a front sectional view of a nozzle device according to the present invention. Explanation of symbols representing main parts of the drawings, 17...
...Wire electrode, 37...Wire guide, 53...
Movable cylindrical body, 55... fixed cylindrical body, 59... nozzle,
57...Pressure chamber.

Claims (1)

[Scope of utility model registration request] Wire electrode 1 in wire cut electric discharge machine
A wire guide 37 is provided to guide the wire guide 7, and a movable cylinder 53 is supported so as to be movable up and down on a fixed cylinder 55 surrounding the wire guide 37. A nozzle 59 for spraying onto the workpiece W is attached and provided, and the nozzle end is provided so as to be able to come into contact with the workpiece W. The nozzle 59 is placed between the fixed cylinder 55 and the movable cylinder 53.
A nozzle device for a wire-cut electric discharge machine, characterized in that a pressure chamber 57 is formed and provided, and a communication hole is provided for introducing the machining fluid into the pressure chamber 57.