JPS5810426A - Discharge processing device - Google Patents

Abstract

PURPOSE:To execute discharge processing of the plural number of points different in each processing direction by putting a processing head in a rotatory motion round two mutually orthogonal axes in addition to mutualy orthogonal linear motions of a table of a discharge processing device and a vertical motion of the processing head. CONSTITUTION:A base of discharge processing device is provided with a table 9 which is under feed control in two mutually orthogonal directions (X-Y direction) by means of motors 10, 11 while a column is provided with a saddle 14 fed in the vertical (Z) direction by means of a motor 16. A head support part 12 which so supports a processing head 6 as to allow its swivelling round a shaft S' is provided on the saddle in such a way as it may swivel round a shaft S. The processing head 6 is provided with a processing electrode 7 which is under feed control in the direction of an arrow (a) by means of a motor 8. The processing head 6 is controlled so as to be perpendicular to the surface of a part, to be processed, of a work which is fitted on a table 9 and has the surface bending in Z direction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electric discharge machining apparatus, in particular, movement of a machining table on which a workpiece is placed in the X (left and right) directions and Y (front and back) directions, and two (up and down) movements of the machining head. Lifting in the direction, X-Z
The mounting posture of the workpiece on the processing table is reset by enabling rotation in the direction along the plane and tilting in the direction along the py-z plane by manual or automatic control. The present invention relates to an electric discharge machining apparatus that performs electric discharge machining at a plurality of locations in different machining directions without any problems.

As is generally known, electrical discharge machining equipment is used in a wide range of machining fields by taking advantage of the excellent features of electrical discharge machining. In particular, it is possible to process efficiently regardless of the mechanical properties of the workpiece, such as hardness, tensile strength, work hardening properties, etc., and even when processing complex shapes, it is possible to use electrodes with a shape that corresponds to the shape to be machined. Since high-precision processing can be performed using the above-mentioned Jllll! It is widely used in the field of processing I-type metals. In electrical discharge machining, the difficulty level of setting the feeding angle of the machining electrode and relative positioning of the machining electrode and the workpiece varies depending on the shape of the workpiece. Generally, electric discharge machining on a donut-shaped workpiece is relatively simple if the workpiece is rotated about the center for each machining process. In particular, as shown in FIGS. 1 and 2, the through holes 2, 3, 4, 5
, 3', 4', 5' (hereinafter referred to as through hole 2...
・5′) is easy to process. 1 is a plan view of the workpiece 1, and FIG. 2 is a sectional view taken along the arrow A-A in FIG. The through holes 2...5' are arranged in the centripetal direction relative to the central axis 0 and in the second
As shown in the figure, it is machined in the normal direction to the outer peripheral surface perpendicular to the circumference.

As mentioned above, it is obvious that the through holes 2...5' shown in FIGS. 1 and 2 are easy to process, so the explanation will be omitted, but There is a problem. In other words, (f) A processing table with a width corresponding to the workpiece IK is required, and therefore, the larger the diameter of the workpiece 1, the larger the area of the processing table must be, making the entire device larger. Become.

(b) Since the through holes 2...5' are machined one by one, it takes a long time to complete the product.

In order to solve the above problems, the workpiece 1 shown in FIG. 1 is divided into a plurality of blocks 1-1, 1-2,...
It is considered that the block is divided into . . . and each block is machined using a plurality of electrical discharge machining devices. That is, for example, when dividing into n blocks, if the machining is performed using n electrical discharge machining devices, the machining time can be reduced to l/n and the machining table can also be made smaller. Naturally, as shown in FIGS. 3 and 4, which show a plan view and a side view of block 1-1, which is obtained by dividing the workpiece 1 shown in FIG. This is because the number of holes is 179, which is divided into smaller holes. However, the penetrating direction of each through-hole is perpendicular to the circumferential direction and the direction perpendicular to the circumferential direction, as described above, and therefore, they are all different. Therefore, there is a problem in that it is very difficult to set the feeding direction of the processing electrode.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electrical discharge machining apparatus that can solve the above-mentioned problems, that is, reduce machining time and perform electrical discharge machining with high machining accuracy. Therefore, the electric discharge machining apparatus of the present invention includes a machining table on which a workpiece is placed and a machining head that feeds a machining electrode, and processes the workpiece using electric discharge energy. an X-direction table drive means for moving the processing table in the left-right direction, that is, the X direction; a Y-direction table drive means for moving the processing table in the front-rear direction, that is, the Y direction; a head support section that tiltably supports the processing head;
A head drive unit is provided that rotates the head support unit and moves it up and down in the vertical direction, that is, in two directions, and at least the head drive unit rotates the head support unit in the direction along the X-2 plane by automatic control. The head support section is characterized in that it is configured to support the processing head so as to be tiltable in a direction along the Y-Z plane.

This will be explained below with reference to the drawings.

FIG. 5 is a front view of one embodiment of the electrical discharge machining apparatus of the present invention, and FIG.
The figure shows a side view of the embodiment shown in FIG. 5, and FIG. 7 shows an explanatory diagram regarding the displacement amount setting of the processing table and processing head in the embodiment shown in FIGS. 5 and 6.

First, the names and operations of each part of the electrical discharge machining apparatus of the present invention will be explained with reference to FIGS. 5 and 6. In addition,
Block 1-1 is the same as shown in FIGS. 1-4.

The reference numeral 6 in the figure is a processing head, and the pulse motor 8
The machining electrode is fed in the direction of the arrow S in the figure, and electrical discharge machining is performed on the block 1-1.

Reference numeral 9 denotes a processing table, which is configured to be moved by a motor 10 in the direction of arrow X in the figure and by a motor 11 in the direction of arrow Y in the figure.

Reference numeral 12 denotes a head support portion which supports the processing head 6 and is configured to tilt the processing head 6 in the direction indicated by the arrow in the figure by operating the head tilting handle 13.

Reference numeral 14 denotes a head rotation drive unit, which is rotated by a motor 15 to rotate the processing head 6 in the direction of arrow C shown in the figure via the head support unit 12, and the head rotation drive unit 14 itself is rotated by a motor 16 as shown in the figure. By moving up and down in the two directions of the arrows, the processing head 6 is moved up and down, that is, in two directions.

Reference numeral 17 denotes a machining tank for immersing the block 1-1 in a machining liquid (not shown).

The operations of the main parts constituting the electric discharge machining apparatus of the present invention, that is, the machining head 6, the machining table 9, the head support section 12, and the head rotation drive section 14 have been explained above.
The overall operation of the electrical discharge machining apparatus of the present invention will be described below in connection with machining a through hole as shown in the block 1-1 shown in FIGS. 1 to 4.

Before proceeding with the above comprehensive operation description, the position and direction of the through hole to be machined in block 1, which is the workpiece, will be explained. That is, the position of the above-mentioned through hole on the outer circumferential surface of the block 1-1 is a position that satisfies the following (A-1) and (Person-2).

(A-1) First, as shown in FIGS. 3 and 4, a line that is parallel to the circumferential direction, that is, the X direction shown in the drawing, and that intersects with the central axis OK@straight plane, that is, a one-dot chain line It is located on the arc (IV)...(0...(■') shown in the figure. That is, the arc (■) of radius R(r), the arc (2) of radius R@, and υ, ... is located above.

(A-2) Furthermore, the arrangement position in the direction intersecting the X direction is on a line intersecting the plane passing through the central axis O1-. For example, through hole 5-4. .......

2-4. ......, 5'-4 is a through hole 5-5 located on a line passing through the central axis O and intersecting the plane in two directions shown in the figure.
．． ......, 2-5. ...5/-5 is the above 5-4. It is on a line that makes a central angle 0 with respect to a plane passing through . . . and intersects a plane passing through the central axis O.

■ Next, the penetrating direction of the through hole is the centripetal direction with respect to the central axis 〇, in other words, the normal direction to the circular arc (Lli) (T) (W), and as shown in Figure 2. It is in the normal direction to a line that intersects the plane passing through the central axis 0 and the outer peripheral surface of the block 1-1.

As mentioned above, the overall operation of the electric discharge machining apparatus of the present invention is described in block l-1 shown in FIGS. 1 to 4.
This will be explained in relation to the case where a through hole is fabricated that satisfies the conditions (to) and (2) above.

First, as shown in FIGS. 5 and 6, the block 1-1 is placed seven times on the processing table 9. 0) First, the case of processing the through holes 2-1 to 2-7 existing on the arc (I) will be explained with reference to FIG. 1.

(For example, the through hole 2-4 on the circular arc (T) is the sixth
As shown in FIG. 6 and FIG. 6, processing is performed so that the processing electrode feed direction 6 is perpendicular to the surface of the processing table 90, that is, perpendicular to the arrows X and Y directions shown in the figure. By doing so, the above conditions (A and (to)
It can be processed to meet the requirements. At this time, the processing table 9 is moved in the Xt+Y direction by the motor 10 and the motor 11 so that the feed direction - of the processing electrode matches the position of the through hole 2-4 to be processed. Needless to say, lick it.

That is, to explain the case of machining the first through hole 2 with reference to FIG. 7, the feeding direction of the machining electrode 7 is indicated by the arrow gtt),
At this time, the rotation center of the processing head 60 (corresponding to the rotation center axis B of the processing head 6 shown in FIG. 5) is -(1), and from the rotation center -(1) to the through hole 2-4
The distance to is expressed as t.

(2) Next, for example, when processing the through hole 2-J5, the relative positions of the processing head 6, processing table 9, and O are changed as shown below based on the state of processing (1) above. That is, (2-1) Since the position of the skeleton through-hole 2-5 in the Y direction of the arrow shown in FIG. Also, the processing head 6 is not tilted in the 6th vA arrow direction.

(2-2) Since the central angle between the through hole 2-5 and the through hole 2-4 with respect to the central axis O is -, the processing head 6
0 in the direction of the arrow shown in Figure 5 (clockwise in this case)
Rotate.

(2-3) Next, as shown in FIG. 7, the feeding direction α(2) of the machining electrode is rounded to match the through hole 2-5, and the rotation center e of the machining head 6 is set to -( 1) to 1(2)K
It is necessary to change the relative position between the processing head 6 and the block 1-1, which is the object to be processed, so as to displace the block 1-1. That is, the processing table 9 is moved in the negative direction of the X direction in the direction of the arrow shown in FIG.
2) and move the head rotation drive unit 14 to the sixth position.
It is lowered by arrow (2) in FIG. 6 in the negative direction of arrow 2 in the figure. Incidentally, the above ΔX(2) and Δt(2) are determined by the following equation, as is clear from FIG. That is, AXf21-(R(r)+t)-sin#
−・−・−・・−・・・・・・・(1)Δj(21−(
R(n+4) (1-oos #)----= (
As shown in (2-1) to (3) above, the through hole 2-5 can be processed by changing the relative position of the processing head 6 and the processing table 9.

(3) Furthermore, the other through holes 2-6, 2-7 and 2-1 to 2-3 existing on the arc (I) can be processed in the same manner as in the above processing (2).

■ Next, the circular arc (
2) Processing of the through holes 3-1 to 3-7 existing above will be explained.

Through holes 3-1 to 3-7 existing on the arc (2)
The through hole 2 that exists on the arc (I) mentioned above! The differences from -1 to 2-7 are as follows. That is, (1) Through holes 2, which are shown in a round shape in FIG. 2 to represent the through holes 2-1 to 2-7 on the arc (I), and the through holes 3-1 to 3-1 on the arc (■) 3-1, the circular arc (r
) C) Adjacent through holes 2-1 to 2-7 and through holes 3-1 to 3-7 on arc (2), that is, through holes 2
-1 and 3-1.2-2 and 3-2. The angle of the penetration direction of ... should be α.

(Acupuncture) The radius of the above circular arc (1') with respect to the central axis O is R (
I), whereas the radius of the arc ■ is R(2).

Therefore, (2-1) and (
Except for (4) and (5) below, which correspond to 2-3), the above processing (0) may be performed in the same manner, that is, (4)
) Based on the above difference (1), for example, through hole 3
When machining -4, the above machining (through hole 2 in case of D)
Based on the relative relationship between the processing head 6 and the block 1-1 which is the workpiece in the processing of step 4, the processing head 6 is tilted by an angle α in the direction of the arrow shown in FIG. 6 (clockwise). At this time, the relative position of the processing head 60 tilting center -' with respect to the block 1-IK is changed by the processing (r).
(2-3)K) corresponds to the change in the relative position of the center of rotation with respect to the plotter 1-1 as explained with reference to FIG. 7, and is easily understood. Detailed explanation will be omitted. Note that the movement of the processing table 9 in this case is in the Y direction.

As shown in Fig. 5 and Fig. 1116, the central axis of rotation of the machining head 6 in the direction of the arrow C in the electric discharge machining apparatus of the present invention is always perpendicular to the two directions of the arrows in the figure. In other words, since it is parallel to the Y direction of the arrow shown in the figure, the tilt angle of the processing head 6 in the direction of the arrow shown in the figure is the arc of the circle shown in FIG.
For example, the machining can be carried out while maintaining the predetermined angle determined corresponding to the above-mentioned machining (vertical in D, and at the tilting angle α in the machining @ described in Komu).

Here, the rotating operation referred to in the present invention, that is, the O rotation operation of the processing head 6 in the direction of the arrow C shown in FIG. The mutual relationship between this and the installation direction of the block 1-1, which is a workpiece, on the processing table 9 will be explained. For example, if the installation state of the pipe tube 5 of the block 1-1 is
The direction is changed by 90 degrees from the state shown in FIG. 6 and FIG.
Rotating motion along the illustrated arc, for example (2), in one direction O
Similarly, the tilting operation, that is, the tilting operation to switch from the circular arc shown in the fourth wi, for example, (r) to
If machining is performed by tilting in the direction, the desired machining results will not be obtained. This is because when the machining head 6 is tilted at a predetermined angle in the C direction and rotated in the above direction, the locus of the tip of the machining electrode will follow the arc shown in FIG. This is because they cannot exist on the same plane.

(5) Based on the above difference (11), the processing corresponding to (2-3) in the above processing (2) is R( It is sufficient to replace I) with R@ and find the displacement amounts corresponding to ^X(2) and Δt(2), respectively.

As described above, the processing for the through holes 2-1 to 2-〒 existing on the circular arc (p) shown in FIGS.
The processing for -7 was explained in the above (■), but in the same way, the arcs (■, 1Iyl and
') It is also possible to process each through hole in sequence.

The above is related to the electrical discharge machining apparatus of the present invention when the block 1-1 as shown in FIGS. However, it is also possible to automate each series of operations by automatically controlling them using, for example, NC control means.

Further, the above description regarding the electrical discharge machining apparatus of the present invention is based on the first
Although the description has been made in connection with the machining of the through hole in the block 1-1 shown in FIGS. Electric discharge machining of workpieces, for example, machining of tire molding molds, can also be carried out efficiently and efficiently.

As explained above, according to the present invention, the processing table on which the workpiece is placed can be moved in the X (left and right) direction and the Y (front and back) direction, the processing head can be moved up and down in the 2 (up and down) directions, and the
- Set the mounting posture of the workpiece on the processing table by making it possible to rotate in the direction along the Z plane and tilt in the direction along the Y-Z plane manually or by controlled drive. It is an object of the present invention to provide an electric discharge machining device that can perform electric discharge machining efficiently and with high machining accuracy by making it possible to perform electric discharge machining at a plurality of locations in different machining directions without redoing the machining direction. can.

[Brief explanation of the drawing]

Fig. 1 is an overall plan view of a donut-shaped workpiece, which is a prerequisite for the workpiece, in order to explain the workpiece that is machined using the electric discharge machining apparatus of the present invention; Arrow A-
Cross-sectional view at A, Figure 3 line, Block 1-1 shown in Figure 1
FIG. 4 is a side view in the direction of arrow C shown in FIG. 5, FIG. 5 is a front view of an embodiment of the electric discharge machining apparatus of the present invention, and FIG. FIG. 7 shows explanatory diagrams regarding the displacement amount setting of the processing table and processing head in the embodiment shown in FIGS. 5 and 6. In the figure, 1-1 is a block, 2 to 5 and 3' to 6' are through holes, 6 is a processing head, 7 is a processing electrode, 8 is a pulse motor, 9 is a processing table, and 10 is an X-direction table drive motor. , 11 is a Y-direction table drive motor, 12
13 is a head tilting handle, 14 is a head rotation drive unit, 15 is a head rotation motor, lσ is a head lifting/lowering motor, and 17 is a processing tank.

Claims (1)

[Claims] In an electric discharge machining apparatus that includes a machining table on which a workpiece is placed and a machining head that feeds a machining electrode, and processes the workpiece using electrical discharge energy, the machining table is moved in the left-right direction, that is, in the X direction. An X-direction table driving means, a Y-direction table driving means for moving in the front-rear direction, that is, the Y direction, a head support section that tiltably supports the processing head, and a head that rotates and raises and lowers the head support section in the vertical direction, that is, two directions. A rotation drive section is provided, at least the head rotation drive section rotates the head support section in the direction along the X-2 plane by automatic control, and the head support section rotates the processing head along the Y-Z plane.
An electric discharge machining device characterized in that it is configured to be supported so as to be tiltable in a direction along a surface.