JPH0463633A - Discharge machining device and discharge machining method - Google Patents

Abstract

PURPOSE:To obtain a discharge machining device rotating an electrode or a work in an optional direction around the Z-axis with a simple structure by connecting the electrode and a spindle via a universal joint, and providing an actuator freely oscillating the electrode side against the spindle between the electrode side and the spindle. CONSTITUTION:Fitting seats 5a, 5b are provided on opposite faces of a spindle 2 and an electrode head 4, and the seats 5a, 5b are connected with a dowel block 13. Small motor cylinders 14, 15 are provided on the upper face side and the side face side of the dowel block 13 between the fitting seats 5a, 5b. When either one or both of the motor cylinders 14, 15 are driven, the electrode head 4 and a machining electrode 6 integrated with the head 4 can be oscillated in an optional direction against a lift shaft. A table 7' is mounted on a dowel block l3', the dowel block 13' is mounted on X, Y-axis moving/positioning systems 9', 10' so that a work W supported by the table 7' can be oscillated against the electrode 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric discharge machine equipped with an electrode and/or a table surface whose direction can be freely changed, and an electric discharge machining method using this machine.

[Conventional technology]

2. Description of the Related Art Electric discharge machines that move electrodes in horizontal or diagonal directions during electrical discharge machining have been known.

The diagonal movement of the electrode is achieved by attaching a spindle supporting the electrode to the column via a cam mechanism.

[Problem to be solved by the invention]

However, the diagonal movement of the electrode described above is because the direction of the diagonal movement is fixed in one direction by the cam mechanism.
In order to allow the spindle to move diagonally around all two axes, a complex support structure is required, or the workpiece side must be moved in a complementary manner, making the mechanism mechanically complex. I didn't get it.

In view of these points, it is an object of the present invention to develop an electric discharge machine with a simple structure in which the electrode or workpiece, or both, can be oriented in any direction around two axes. be.

[Means to solve the problem]

The main components of the present invention, which was made to solve the above problems, are: a spindle that is raised and lowered in the vertical direction by an actuator such as a motor; a processing electrode supported by this spindle; and a processing electrode that is placed opposite the electrode. In an electric discharge machine consisting of a table that supports a work in liquid, a movement control device for the spindle, and a power source for the electrode, the electrode and the spindle are connected via a universal joint, and the electrode side is connected to the spindle. This is characterized in that an actuator that swings freely against the spindle is installed between the electrode side and the spindle.

[For production]

The electrode, which moves forward and backward with respect to the workpiece by raising and lowering the spindle, can be tilted in any direction around the forward-backward axis when moving forward and backward, so that highly efficient machining can be achieved.

This effect can be obtained by controlling the posture of the workpiece side in the same way, so in the present invention, an embodiment will be described in which the above-mentioned swinging function is added to the electrode side and the workpiece side.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an example of an electrical discharge machine according to the present invention.

In this figure, 1 is a motor that serves as an actuator for lifting and lowering the spindle 2, and 3 is a feed screw formed integrally with the output shaft of the motor 1. The spindle 2 is non-rotatably screwed onto this screw 3. By rotating the screw 3, it is moved up and down on this screw.

Reference numeral 4 denotes an electrode head attached to the spindle 3 via a connecting portion 5, and the lower end side of the head 4 is formed into an electrode 6 that functions as a processing tool.

Thus, the electrode 6 is raised and lowered together with the raising and lowering of the spindle 2.

Reference numeral 7 denotes a work table disposed facing the electrode 6, and a container 8 containing a machining liquid is provided. A workpiece W to be processed is accommodated in this container 8 .

Reference numeral 9.10 is a positioning mechanism for moving and positioning the table 7 on the X and Y axis planes, and reference numerals 9m and 10m are motors serving as driving sources thereof.

11 is a power source for the electrical discharge machining electrode 6; 12 is each of the above motors 1;
',' 9+*, Low, for example, an NC control unit that controls the drive of the power supply 11.

The above items 1 to 12 constitute an example of a known electric discharge machine, and the present invention relates to such an electric discharge machine.

The connecting portion 5 between the electrode 6 and the spindle 2 is constructed as shown in FIGS. 2 and 3, and the electrode 6 is structured to be swingable about its vertical axis. This point will be explained below.

A mounting seat 5a is provided on the opposing surface of the spindle 2 and the electrode head 4.
5b is provided, and the seats 5a and 5b are connected by a Siebel block 13 as an example of a universal joint.

Reference numerals 14 and 15 designate small motor cylinders installed between the mounting seats 5a and 5b shown in FIG. 2 on the upper and side surfaces of the Siebel block 13.

By driving one or both of these motor cylinders 14, 15, the electrode head 4 and this head 4
The processing electrode 6, which is integrated with the machine, can be oscillated in any direction about its lifting axis.

Such a swing mechanism □ mechanism may be formed into a mechanism as shown in FIG.

FIG. 3 is a plan view of another example of the above-mentioned swinging mechanism, in which brackets 5c, 5 are arranged perpendicularly to the spindle 2 when viewed from above.
By extending the motor cylinders 14 and 15 from the brackets 5e and 5d, the electrode head 4 having the machining electrode 6 can be swung in any direction about its lifting axis. . Note that 13 is a Siebel block.

The above effects of the present invention can also be obtained by providing the table 7 on the moving mechanism via the swinging mechanism, in combination with the swinging of the electrode 6, or alone.

That is, as shown in FIG.
, by mounting the Y-axis moving positioning mechanisms 9'' and 10', the workpiece W supported on this table 7' can be moved to the electrode 6.
This is because you can swing your head against the ground. In addition, 14', 1
5' is an actuator such as a motor cylinder for swinging.

Note that the table 7' is not connected to the Siebel block 13',
For example, it may be mounted on a movable positioning mechanism using actuators such as three or four motor cylinders for swinging motion.

In this way, the electrode 6, the table 7 or 7', or the electrode 6 and the table 7 or 7' are provided so as to be able to swing freely, and electrical discharge machining is performed on the workpiece W while controlling the swing of these parts. If the electrode 6 moves, it may interfere with the workpiece W when the electrode 6 returns. In order to avoid such interference, one aspect of the present invention is to perform the return operation of the electrode 6 in a pattern completely opposite to that of the control command during electrical discharge machining.

By doing this, the relative positional relationship between the electrode 6 and the workpiece W in the forward machining path of the electrode 6 and the workpiece W is traced in the same way as it moves backwards.
does not interfere with the workpiece W.

〔Effect of the invention〕

The present invention is as described above, and since the electrode 6 can be raised and lowered relative to the workpiece W and can freely swing its head relative to the workpiece W, removal processing such as die-sinking is possible. can be processed efficiently.

In particular, one aspect of the present invention is that it is possible to remove tapered or acute-angled shapes with high efficiency and precision.
It has special effects that cannot be obtained with conventional electrical discharge machines.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an example of the electric discharge machine of the present invention, Fig. 2 is an enlarged front view of an example of its oscillating structure, Fig. 3 is a plan view of another example, and Fig. 4 is a table oscillating structure. It is a front view of the main part of an example. 1...Motor, 2...Spindle, 3...Feed screw, 4
... Electrode head, 5 ... Connection part, 6 ... Processing electrode,
7. Table, 8. Container, W. Work, L. Machining liquid, 9.10. Movement positioning mechanism, 11. Power supply, 12. NG control unit, 13. Sebel. Block, 14.15...Motor cylinder

Claims (1)

[Claims] 1. A spindle that is raised and lowered in the vertical direction by an actuator such as a motor, a machining electrode supported by the spindle, and a table that supports a workpiece in a machining fluid at a position facing the electrode. In an electrical discharge machine comprising a movement control device for the spindle and a power source for the electrode, the electrode and the spindle are connected via a universal joint, and an actuator is provided for freely swinging the electrode side relative to the spindle. An electric discharge machine characterized by being installed between an electrode side and a spindle. 2. A spindle that is raised and lowered in the vertical direction by an actuator such as a motor, a processing electrode supported by this spindle, a table that supports a workpiece in processing fluid at a position opposite to this electrode, and a movement control device for the spindle. and a power source for the electrode, characterized in that the table is formed by a Siebel table equipped with an actuator for freely swinging its head about the vertical axis of the electrode. 3. A spindle that is raised and lowered in the vertical direction by an actuator such as a motor, a processing electrode supported by this spindle, a table that supports a workpiece in processing fluid at a position opposite to this electrode, and a movement control device for the spindle. In an electric discharge machine consisting of a power supply for the electrode and a power supply for the electrode, the electrode and the spindle are connected via a universal joint, an actuator for swinging is installed between the electrode and the spindle, and a table is used to raise and lower the electrode. An electric discharge machine characterized in that it is formed by a Siebel table equipped with an actuator for freely swinging its head about an axis. 4. When performing electric discharge machining while oscillating the machining electrode or the table, or the electrode and the table,
This electrical discharge machining method is characterized by moving the machining electrode and workpiece relative to each other using a trace pattern in the opposite direction to the numerical control during electrical discharge machining, in order to avoid interference between the electrode and the workpiece after this machining. 5. The electric discharge machine according to claim 1, wherein the table supporting the workpiece is provided movably within a secondary plane and is controlled by a movement control device.