JPS61249220A - Nozzle apparatus for wire cut electric discharge machine - Google Patents

Abstract

PURPOSE:To permit the desired working without separately installing a cooling apparatus, by installing branched pipes at proper positions on a working-liquid feeding nozzle having a center shaft installed in a specific tilt angle for an electrode and cooling the electrode guides and feeding elements. CONSTITUTION:A wire electrode 12 is sent out from a feeding drum 1 ans applied with voltage pulses between a workpiece 14 through feeding rollers 5 and 8 from a power source and wound onto a taking-up drum 13 after use. The main nozzles 10a and 11a are installed in inclined form within an angle of 15 deg. for the electrode 12, and a sufficient quantity of working liquid is supplied into a working gap. At the same time, working liquid is injection-supplied from each branched pipe 10b, 10c, 11b, 11c into guide rollers 3 and 9, feeding rollers 5 and 8, and electrode guides 6 and 7, which are cooled. Therefore, the working having high precision can be carried out in a short time without cooling the feeding rollers and electrode guides by stopping the working for a certain time.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a nozzle device for a wire-cut electrical discharge machining device, particularly a nozzle device for a wire-cut electrical discharge machining device in which the central axis is inclined at an angle of 15 degrees or less with respect to a wire electrode. This invention relates to improvements in nozzle devices.

[Conventional technology]

In wire cut electrical discharge machining, it is essential to supply sufficient machining fluid into the machining gap, and for this purpose a machining fluid supply nozzle is provided.

The machining fluid supply nozzle of wire-cut electrical discharge machining equipment generally has a nozzle diameter of approximately 4 mm to 8 mL, for example.
Several so-called single-flow nozzles have been used.

In addition, a double nozzle is also used, which is formed into a double tube shape and has an auxiliary nozzle that opens annularly around the main nozzle.

However, when processing objects with complex shapes or thick workpieces, both the single flow nozzle and the double nozzle supply a sufficient amount of processing liquid to the gap between the wire electrode and the workpiece. As a result, the average machining current cannot be maintained at a high level due to an increase in the machining average current.During electrical discharge machining, the wire electrode is not completely straight and curves into an arched shape, making high-speed machining impossible and reducing machining accuracy. There was a point.

In order to solve this problem, a nozzle device for a wire-cut electrical discharge machining device was developed in which the nozzle device for a wire-cut electrical discharge machining device is configured to intersect the wire electrode at an angle of 15 degrees or less.

According to the nozzle device for a wire-cut electrical discharge machining apparatus, the machining conditions such as the plate thickness and machining shape of the workpiece and the diameter of the wire electrode are under normal customary machining conditions, that is,
The thickness of the workpiece is approximately 100 ms+, a normal iron mold material, the machining shape has few or almost no sharp corners, the electrode diameter is 0.05 to 0.35 m, and the machining speed is 2.
If the machining conditions are within about 001112, a sufficient amount of machining fluid corresponding to the machining conditions can be supplied to the machining gap, so the wire electrode is always held in a straight line during electrical discharge machining and the wire electrode is kept in line with the workpiece. It has become possible to perform good machining with high precision and fairly high speed.

However, during wire cut electric discharge machining,
The wire electrode guide or feeder etc. that are close to the machining part become hot and need to be cooled with machining fluid or other means, but in the above-mentioned wire cuff) nozzle device for electrical discharge machining equipment, the machining fluid is completely absorbed into the machining gap. Therefore, there were problems such as the need for a separate cooling device to sufficiently cool the wire electrode guide or feeder.

[Problems to be solved by the present invention]

The present invention has been made based on the above-mentioned viewpoints, and its purpose is to improve the processing conditions such as the plate thickness and processing shape of the workpiece, the diameter of the wire electrode, the processing speed, etc. As long as the machining conditions are conventional, a sufficient amount of machining liquid corresponding to the set machining conditions can be supplied into the machining gap formed by the wire electrode and the workpiece, and a special cooling device is not required during machining. A nozzle device for a wire-cut electrical discharge machining machine that can sufficiently cool a wire electrode guide or a feeder in the vicinity of a machining part without providing a This is what we are trying to provide.

[Means for solving problems]

Therefore, the above purpose is to align the central axis with respect to the wire electrode.
In machining fluid supply nozzles installed at an angle of less than 5 degrees,
This can be achieved by providing a branch pipe at an appropriate location of the machining fluid supply nozzle and supplying the desired machining fluid to the wire electrode guide or feeder.

[For production]

As mentioned above, by providing branch pipes at appropriate locations of the machining fluid supply nozzle, which is installed with its central axis inclined at an angle of 15 degrees or less with respect to the wire electrode, a sufficient machining gap can be maintained under any machining conditions. In addition to being able to supply a large amount of machining fluid, the wire electrode guide or feeder, etc. in the vicinity of the machining part can be sufficiently cooled by the machining fluid sprayed and supplied from the branch pipe without the need for any other special cooling device. Because
Highly accurate machining can be performed continuously for long periods of time at fairly high speeds.

〔Example〕

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

FIG. 1 is an explanatory diagram showing a state in which a nozzle device for a wire-cut electrical discharge machining device according to the present invention is attached to a wire-cut electrical discharge machining device, and FIG. It is an explanatory view showing a state where it is attached to a device.

First, FIG. 1 will be explained.

In Figure 1, l is a wire electrode supply drum, 2 and 2' are brake rollers and pinch rollers, 4 and 4' are capstans and pinch rollers, 5 and 8 are power supply rollers or power supply bins, and 6 and 7 are wire electrodes. Guides 3 and 9 are guide rollers; 10 and 11 are provided with their main nozzles 10a and 113 inclined at an angle of less than 15 degrees with respect to the wire electrode 12, and a guide roller 3 is located at an appropriate position close to the processing part. and 9, and a nozzle for a wire-cut electrical discharge machining device, in which branch pipes IQb, IOC, Ilb, and IIC are formed to jet and supply machining fluid to cool power supply rollers 5 and 8, wire electrode guides 6'' and 7, etc. device, 1
3 is a wire electrode collection drum, and 14 is a workpiece.

Thus, the wire electrode 12 is sent out from the wire electrode supply drum 1 and is connected to the workpiece 14 from a power supply circuit (not shown).
and the wire electrode 12 via the power supply roller or pins 5 and 8.
A predetermined processing voltage pulse is applied to the used wire electrode 12, and the used wire electrode 12 is wound onto the wire electrode collection drum 13.

The nozzle devices 10 and 11 each include main nozzles 10a and 11a that supply machining fluid to the machining gap, guide rollers 3 and 9 located close to the machining part at appropriate positions on the machining fluid supply nozzle body, and power supply rollers or pins. Branch pipes 10b, toc, llb, and llc are formed to spray and supply machining liquid to the wire electrode guides 5 and 8, the wire electrode guides 6 and 7, and the like for cooling. The tips of the main nozzles 10a and lla are rounded so that the machining liquid is concentrated and ejected into the machining gap.

Thus, in the above-mentioned nozzle device for wire-cut electrical discharge machining equipment, the main nozzle 10a and the Ila portion are connected to the wire electrode 12.
It is attached to a part of the main body of the wire-cut electrical discharge machining apparatus while being tilted at an angle of 15 degrees or less.

As described above, the nozzle device for wire-cut electrical discharge machining equipment is installed at a desired location of the wire-cut electrical discharge machining equipment, with the main nozzle 10a and Ila portions being inclined at an angle of 15 degrees or less with respect to the wire electrode 12. As a result, a sufficient amount of machining liquid corresponding to the conventional machining conditions can be supplied from the main nozzles 10a and 11a into the machining gap. Good machining can be performed on the workpiece 14 at high speed in a short time, and during machining, the guide rollers 3 and 9, power supply rollers or pins 5 and 8, which are close to the machining part,
and wire electrode guides 6 and 7 etc. are connected to each branch pipe to b.
, 10c and the machining fluid jetted from llb and llc.

In particular, in normal wire-cut electrical discharge machining, the main nozzles 10a and 113 portions of the nozzle devices 10 and 11 for wire-cut electrical discharge machining machines may intersect with the wire electrode 12 at an angle of about 3 degrees to 5 degrees. If it is installed in a part of the processing machine body like this, a sufficient amount of processing fluid will be injected into the machining gap regardless of the machining fluid jetting pressure set at any pressure within the range of 3 kg/cJ to 150 kg/cIa. can be supplied. In addition, the guide rollers 3 and 9, power supply rollers or pins 5 and 8, wire electrode guides 6 and 7, etc. that are close to the processing part are connected to each branch pipe 10b, IOC and ll.
b. Since it is sufficiently cooled by the machining fluid jetted out from the ILC, there will be no errors in machining accuracy due to disconnection or thermal expansion of the wire electrode 12. Since there is no need to stop machining and cool down the power supply roller, wire electrode guide, etc., highly accurate machining can be performed in a short time, and unattended continuous operation for long periods of time is also possible.

Thus, the main nozzles 10a, 113 of the nozzle devices 10 and 11 are connected to the wire electrode 12 in the machining gap formed by the 70 am thick SKD material and the wire electrode 12.
It is installed at a desired location on the main body of the wire-cut electrical discharge machining apparatus so that the parts intersect within a range of about 3 to 5 degrees, and the machining fluid is ejected from the main nozzles 10a and lla at a pressure of 3 kg/
Set to an arbitrary pressure in the range of cJ to 150 kg/-, guide rollers 3 and 9 close to the processing part,
The power supply rollers or pins 5 and 8, wire electrode guides 6 and 7, etc. are equipped with branch pipes lQb, IOC and 1lbSI.
One wire cut electrical discharge machining was performed while supplying machining fluid from the IC at an injection pressure of 1.4 kg/cIa. 220
Machining could be performed at a machining speed within the range of m2/n+in to 320 am2/+ain.

Next, FIG. 2 will be explained.

In FIG. 2, the same numbers as in FIG. 1 indicate the same components, 15 is the lower arm, 16 is the brake roller, 17 is the capstan, 16'
and 17' are pinch rollers, 18 are power supply rollers or pins, 19.20 and 21 are guide rollers, and 22 and 23 are main nozzles 22a and 23c for the wire electrode 12.
The part is tilted at an angle of 15 degrees or less, and processing liquid is applied at appropriate positions to cool the guide roller 3.19, power supply roller or pin 5.18, wire electrode guide 6.7, etc. that are close to the processing part. Branch pipes 22b, 2 that spout and supply
A nozzle device for a wire-cut electrical discharge machining device in which the nozzle device 2C, 23b, and 23c are formed, 24, and a nozzle are provided inside the nozzle device for the wire-cut electrical discharge machining device 22 and the main nozzle 22a, 23a, and the branch pipe 22b. , 22
c, 23b, and 23c, a control valve that controls the jetting amount and jetting pressure of the machining fluid jetted and supplied, 26 a wire electrode return device, 27 a wire electrode automatic folding guide roller, 28 a guide roller, 29 a motor, 30 3 is a slide table that moves the motor 29 in a direction perpendicular to the wire electrode 12; 31 is a base on which the slide table 30 is mounted; and 32 is a turntable that provides rotational motion to the motor 29.

Thus, the device shown in FIG.
This is a wire-cut electric discharge machining device in which the two wire electrodes 12 are folded back by a guide roller 28, and machining is performed using the two folded wire electrodes 12. A nozzle for the wire-cut electric discharge machining device is installed at a desired location on this device. Device 2
The main nozzles 22a and 23a of the main nozzles 22a and 23a are attached to the wire electrode 12 at an angle of within 15 degrees.

Furthermore, main nozzles 22a and 23a are provided inside each of the nozzle devices 22 and the elongation for wire-cut electrical discharge machining equipment.
Control valves 24 and 25 are provided to control the amount and pressure of the machining fluid supplied from the branch pipes 22b, 22c, 23b, and 23c.

In the illustrated wire-cut electric discharge machining apparatus, the wire electrode 12 is folded back into two wires by the guide roller 28, and the two folded wire electrodes 12 are brought into close contact with each other depending on the machining process, or are held at a constant distance. The wire electrode 12 is connected to the wire electrode 12 from a power supply circuit (not shown) via a power supply roller or pin 5.18 to the wire electrode 12 for a predetermined processing purpose. A voltage pulse is applied.

The machining fluid supply nozzles 22 and 23 have main nozzles 22a and 23a that supply machining fluid to the machining gap, respectively, guide rollers 3 and 19 located close to the machining part at appropriate positions on the machining fluid supply nozzle body, and a power supply roller 5. and 18, and branch pipes 22b, 22c, and 23b, 23c for supplying machining fluid to the wire electrode guides 6 and 7, etc., are formed. The tips of the main nozzles 22a and 23a are rounded so that the machining liquid is concentrated and ejected into the machining gap.

Thus, the main nozzle 22a and 23c portions of the nozzle device for wire-cut electrical discharge machining equipment are connected to the wire electrode 12.
The main nozzles 22a and 23a supply machining fluid to the machining gap during machining, and each branch pipe 22b, 22c, 23b, and 23c are guide rollers 3 and 19 close to the processing part, power supply rollers or pins 5 and 18, and wire electrode guide 6.
The machining fluid is jetted and supplied to the parts 7 and 7 for cooling.

During processing, the control valve 24 and the main nozzles 22a, 23a and each branch pipe 22 are controlled according to the material of the workpiece, its thickness, the processing shape, the diameter of the wire electrode 12, etc.
Since machining is performed while controlling the amount and pressure of the machining fluid jetted from b, 22c, 23b, and 23c, a sufficient amount of machining fluid is supplied to the machining gap, and the machining fluid is The rollers, guides, etc. are sufficiently cooled by the machining fluid, and the amount of supply of the machining fluid, power consumption, etc. can be kept to the minimum necessary.

As described above, according to the present invention, the main nozzle portion of the machining fluid supply nozzle is provided so as to intersect with the wire electrode at an angle of 15 degrees or less, and a branch pipe is provided at an appropriate location of the machining fluid supply nozzle. Since the machining is performed while supplying the desired machining fluid to the wire electrode guide or the power supply roller, etc., the machining conditions such as the thickness and shape of the workpiece, as well as the diameter of the wire electrode and machining speed, can be changed from the conventional machining conditions. If the machining conditions are within the specified range, a sufficient amount of machining fluid can be supplied to the machining gap to match the set machining conditions, allowing highly accurate machining to be performed not only in a short time but also over a long period of time. It is also possible to perform continuous machining at fairly high speeds.

Further, since machining can proceed while controlling the supply amount and supply pressure of the machining fluid, the supply amount of the machining fluid and power consumption can be suppressed to the necessary minimum.

〔Effect of the invention〕

Since the present invention is configured as described above, according to the present invention, a sufficient amount of machining fluid can be supplied to the machining gap formed by the wire electrode and the workpiece, and other special Even without installing a cooling device, it is possible to sufficiently cool the power supply and guide pins, rollers, guides, etc. close to the machining part, so errors in machining accuracy caused by wire electrode breakage and thermal expansion are prevented. During machining, the wire electrode can always be held in a straight line, and machining can be performed at high speed for a long time while maintaining high machining accuracy.

Note that the present invention is not limited to the embodiments described above. That is, for example, in this embodiment, two branch pipes are formed in the nozzle device for a wire-cut electrical discharge machining apparatus, but the number of branch pipes can be increased or decreased as desired. In addition, although one control valve is provided inside the nozzle device, one control valve is provided in the main nozzle and each branch pipe, so that the ejection amount and ejection pressure of the machining fluid ejected from each ejection hole can be more appropriately controlled. You may do so. Furthermore, it is also recommended that the position of the branch pipe be variably changed. In addition, the shape of the nozzle device, etc. can be freely changed within the scope of the purpose of the present invention, and the present invention encompasses all of them.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a state in which a nozzle device for a wire-cut electrical discharge machining device according to the present invention is attached to a wire-cut electrical discharge machining device, and FIG. It is an explanatory view showing a state where it is attached to a device.

Claims (1)

[Claims] In a machining fluid supply nozzle whose central axis is inclined at an angle of 15 degrees or less with respect to the wire electrode, desired machining is applied to the wire electrode guide or feeder at an appropriate location of the machining fluid supply nozzle. The above-mentioned nozzle device for a wire-cut electric discharge machining device, characterized in that a branch pipe for supplying liquid is provided.