JPS6314985Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is an electrical machining device that performs electrical discharge machining or electrolytic machining while spouting machining fluid at high pressure. The present invention relates to electrical machining using a high-pressure machining fluid jetting method that rotates and feeds in the axial direction via machining fluid pressure, particularly electrical discharge machining equipment, and this type of equipment for deep hole machining.

As is well known, electric discharge machining equipment applies a voltage pulse between an electrode and a workpiece to generate an electric discharge, and processes the workpiece using this electric discharge, but it generates a lot of machining debris during this machining. . This processing waste adheres to the workpiece and hinders processing. In particular, when drilling small and deep holes, the machining debris may accumulate at the bottom of the hole and become a hindrance, making it impossible to perform the machining. In addition, when performing high-speed electrical discharge machining of a narrow and deep hole, the electrode and workpiece are heated by this electrical discharge machining, and this heating may change the shape and characteristics of the electrode and workpiece, or It is difficult to use the motor alone to servo feed the electrode in response to wear and tear, and it may not be possible to perform the desired processing. Also, if the electrode rotation method is used,
There were various mechanical difficulties in supplying high-pressure machining fluid to a long, thin electrode and ejecting it. This is a common problem even when drilling small and deep holes at high speed by electrolytic processing.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional method and to further improve it, in which a machining fluid flow hole is formed in the axial direction inside the electrode. By supplying and discharging machining liquid from the tip of the electrode to the workpiece at high pressure without being restricted by any problems with the rotational coupling mechanism, the electrode can be smoothly rotated around its axis. An object of the present invention is to provide an electrical machining device for electric discharge machining or the like using a high-pressure machining fluid jetting method, which is capable of rotation, axial support via machining fluid, and servo feeding.

According to the present invention, high-pressure machining fluid is discharged from the tip of the electrode toward the workpiece, thereby blowing away machining debris and supplying a sufficient amount of machining fluid. Therefore, machining waste does not get in the way of machining, and on the contrary, high-speed machining is possible. Furthermore, since the electrode of the electrical machining device of the present invention rotates around its axis, the high-pressure machining fluid released from the tip of the electrode can flow out easily, and this also improves the removal of machining debris. ing. In addition, since the electrode supported through the machining fluid is servo-fed, even if the electrode comes into contact with the workpiece at the tip of the deep hole or is clogged with machining debris, the electrode will move relatively to push the piston and escape. This improves the accuracy of machining without bending the tip of the electrode or bending the deep hole.

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

The high-pressure machining fluid jetting electric discharge machining apparatus 1 of the present invention shown in the figure is installed above the workpiece 2 in order to machine the workpiece 2 placed on the machining table 2b. This rod-shaped electrode 3 has a thin and long rod-shaped electrode 3 such as a needle-like shape whose tips are located opposite each other.
There are liquid flow holes 3a inside the axial direction of the
is formed. The upper end of this electrode 3 is connected to a pipe-shaped piston rod 5 via a connecting part 4. A piston 6 through which the piston rod 5 passes is integrally attached to the upper end of the pipe-shaped piston rod 5.
It is rotatably attached to a cylinder 8 via a bearing 7 provided as necessary. A hose 9 is attached to the upper end of the cylinder 8.
A high pressure machining fluid supply device 10 having a pump etc. is connected to the end of this hose 9, and high pressure machining fluid is supplied from this high pressure machining fluid supply device 10 to the upper chamber 8a of the cylinder 8 via the hose 9. is now being supplied. The cylinder 8 is substantially watertight as a whole, including the bottom plate 8d which holds the bearing part 8c which holds the piston rod 5 rotatably and slidably in the axial direction.
The space between the upper chamber 8a and the lower chamber 8b is also almost watertight,
Although not shown, the lower chamber 8b has an upper chamber 8a.
The piston 6, which rotates under high pressure, may be connected to a fluid pressure source for servo feeding.

Near the lower end of the piston rod 5,
A first motor 1 is located slightly above the connecting portion 4.
A gear 12 for transmitting the rotational force of 1 to the piton rod 5 is integrally attached, and this gear 12
A worm 13 for changing the direction of rotation is engaged with the worm. The rotational force of the first motor 11 is transmitted to the worm 13 via a flexible shaft 14. Therefore,
The rotational force of the motor 11 is transmitted to the piston rod 5 via the flexible shaft 14, the worm 13, and the worm wheel 12, and further to the connecting portion 4.
It is also transmitted to the electrode 3 via the , and rotates it.
A portion of the piston rod 5 between the lower end of the cylinder 8 and slightly above the worm wheel 12 is covered with a telescopic cover 15. cover 1
The piston rod 5 is rotatably attached to the bottom plate 15a of the piston rod 5.
It moves up and down as one with the up and down movement of. Therefore, the motor 11 can be fixed to the bottom plate 15a, and the worm 13 can be formed via a fixed shaft.

In addition, a rack 16 is provided on the side surface of the cylinder 8.
are integrally attached, a pinion 17 meshes with this rack 16, and the rotational force of the second motor 18 is transmitted, whereby the electrical discharge machining apparatus 1 of the invention is brought into the machining state of the machining gap. It is designed to be able to move up and down as shown by arrow 19 by a corresponding servo control signal. Of course, various feed mechanisms and drive sources other than the motor 18 and the rack 16 and pinion 17 can be used. When the piston 6 is servo-fed using machining fluid, the motor 18, rack 16, pinion 17, etc. can be omitted.

Hereinafter, the operation of the high pressure machining liquid electrical discharge machining apparatus 1 configured as described above will be explained.

Second motor 18, rack 16, pinion 17
The vertical position of the electric discharge machining apparatus 1 of the present invention is adjusted by the servo feed to appropriately adjust the distance between the tip of the electrode 3 and the workpiece 2. It is transmitted to the piston 6 via the machining fluid. On the other hand, the first motor 11
The piston rod 5 is rotated via the flexible shaft 14, the worm 13, and the worm wheel 12, and thereby the electrode 3 is also rotated about its axis. At this time, the piston 6 also rotates together.
If high-pressure machining fluid is supplied from the high-pressure machining fluid supply device 10 to the cylinder 8 via the hose 9, this high-pressure machining fluid will be transferred to the piston 6.
While pushing , the liquid passes through the liquid flow hole 3a of the electrode 3 via the piston 6, piston rod 5, and connecting portion 4, and is ejected onto the workpiece 2. In this case, the workpiece 2 may be immersed in the processing liquid. Further, a processing voltage pulse is applied between the electrode 3 and the workpiece 2 by a device not shown,
Intermittent electric discharge is caused between the two, and the workpiece 2 is machined into a hole 2a or into a desired shape by this electric discharge. Along with this electrical discharge machining, the high-pressure machining fluid from the high-pressure machining fluid supply device 10 is forced onto the workpiece from the tip of the electrode 3, so machining debris generated by the electrical discharge machining is removed from the workpiece. It does not accumulate in or near the hole 2a of the workpiece 2, but is blown away and does not interfere with electrical discharge machining. In addition, since the machining fluid is sufficiently supplied at high pressure, the machining section, electrode, and workpiece are sufficiently cooled, and there is no heat-induced machining inhibiting factor, and accuracy is not impaired. Also, at this time, the electrode 3 and the pipe-shaped piston rod 5 are rotated by the first motor 11, so the high-pressure machining fluid can flow very well, and this rotation causes the high-pressure machining fluid to be jetted out. The electrode 3 is also rotated, and the machining liquid from the tip of the electrode 3 is discharged radially from the tip, thereby making it easier to remove machining debris. In this case, if necessary, the rotation of the first motor 11 can be made to provide reversible reciprocating motion, thereby making it possible to easily remove machining debris that is difficult to remove by simply spraying high-pressure machining fluid by rotating in a fixed direction. Can be removed.

As explained above, according to the present invention, high-pressure machining fluid can be smoothly supplied to the rotary tube-shaped electrode, which is moved in the axial direction by the machining fluid pressure. The high-pressure machining fluid ejecting electrical machining device of the present invention has a rotating electrode, and high-pressure machining fluid is ejected from the tip of the electrode, so it is possible to generate fluid during electrical machining such as electrical discharge machining. In addition, the piston and electrode will stop even if the electrode comes into contact with the workpiece or becomes clogged with machining debris, preventing the electrode from bending or bending a deep hole. In addition, the workpiece can be prevented from being heated.

The electrical discharge machining apparatus of the present invention is suitable for machining, for example, a 0.2 to 0.3 φ narrow deep hole at high speed. In addition, as an example of high pressure machining fluid, 20~
A pressure of several tens of atmospheres is used.

In the above embodiment, the cylinder 8 is formed into a relatively thick cylindrical shape, but this configuration is used to connect and supply high-pressure liquid to the rotating body, and the present invention is not limited to this. isn't it.

[Brief explanation of the drawing]

The figure is an overall configuration diagram showing a partial cross section of a high-pressure machining fluid ejecting device showing an embodiment of the present invention. 1...High-pressure machining fluid jetting electrical processing device, 2...
Workpiece, 3... Electrode, 3a... Liquid distribution hole, 5
... Piston rod, 10 ... High pressure processing fluid supply device, 11 ... First motor, 12 ... Worm wheel, 13 ... Worm wheel, 14 ...
...Flexible shaft.

Claims (1)

[Scope of claim for utility model registration] An electric machining device that processes a workpiece by applying a voltage between an electrode and a workpiece to cause discharge or electrolysis, which has a machining fluid flow hole formed in the axial direction. an electrode; a machining fluid pressure supply source having a pump that supplies the machining fluid under pressure; a cylinder interposed between the machining fluid supply source and the electrode; and a cylinder that is slidable and rotatable within the cylinder. a piston installed in the piston; a machining fluid flow hole formed through the piston and a piston rod fixed to the piston; and means for rotating the piston rod fixedly connecting the electrode; A high-pressure machining fluid jetting electrical machining device characterized by having a configuration in which servo feeding of an electrode is performed through the servo feed of an electrode.