JPS61136732A - Wire-cut spark erosion machine - Google Patents

Abstract

PURPOSE:To complete working in a short time by adjusting the relative position of two wire electrodes and simultaneously carrying-out rough working and finishing working by positioning the wire electrodes along the nearly equal working loci. CONSTITUTION:When an X-Y axes table 16 is shifted by a positioning instruction, and the first interpolation instruction is input, the table 16 is shifted so that interpoplation is carried-out for the first wire electrode 201. At this time, the operation of an adjusting mechanism 18 is controlled by a control part 20 so that the second wire-electrode 2-2 executes the interpolation to the position of the electrode 2-1 at the start of working. When the interpolation is completed, the operation of the adjusting mechanism 18 is controlled so that the electrode 2-2 executes the first interpolation. Then, the operation of the mechanism 18 is controlled so that the interpolation instruction which the electrode 2-1 executes is executed successively by the electrode 2-2. Therefore, the working time can be reduced by carrying-out the rough work by the electrode 201 and the finishing work by the electrode 2-2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a wire-cut electrical discharge machining apparatus that reduces the time required to machine a workpiece.

[Prior art] Wire-cut electrical discharge machining equipment, which processes materials by creating an electric discharge between a fed wire electrode and a workpiece, is hard to work with, such as hardened materials or cemented carbide, and is difficult to process using other processing methods. It has features such as being able to process workpieces into objects with complex shapes that are difficult to process.

[Problems to be Solved by the Invention] In machining using this wire-cut electric discharge device, first, the wire electrode and the workpiece are moved relative to each other with the wire electrode following the machining trajectory of the workpiece, and rough machining is performed. . Next, the wire electrode and the workpiece are moved relative to each other again so that the wire electrode follows substantially the same machining locus of the rough-machined workpiece, and finishing machining is performed. This results in a workpiece with a good finished surface and accurate dimensions. Therefore, the process of machining the wire electrode along the machining trajectory is required twice until the machining of the workpiece is completed. For this reason, there is a drawback that it takes a long time to complete processing, and an improvement has been desired.

[Object of the Invention] Therefore, an object of the present invention is to realize a wire-cut electric discharge machining apparatus that can shorten the time required for machining a workpiece and complete the machining in a short time.

[Means for Solving the Problem] In order to achieve this object, the present invention provides electrical discharge between the wire electrode and the workpiece, which are fed in the extending direction, and the wire electrode and the workpiece. In a wire-cut electrical discharge machining device that processes the workpiece by moving the workpiece relatively,
At least two of the wire electrodes are provided, and a wire electrode position adjustment mechanism is provided to adjust the relative positions of the two wire electrodes, and the two wire electrodes are sequentially positioned along substantially the same machining locus. The present invention is characterized in that a control section is provided to control the operation of the wire electrode position adjustment mechanism so as to perform rough machining and finish machining of the workpiece at the same time.

[Operation] According to the present invention, the control section operates and controls the wire electrode position adjustment mechanism to adjust the relative positions of at least two wire electrodes. With this adjustment, at least two wire electrodes are sequentially positioned along substantially the same machining trajectory, thereby moving the wire electrode and the workpiece relatively, and moving the workpiece along the at least two Rough machining and finishing machining are performed simultaneously using wire electrodes. Therefore, the entire processing of the workpiece can be completed by one relative movement between the wire electrode and the workpiece.

[Example] Next, embodiments of the present invention will be described in detail based on the drawings.

1 to 4 show embodiments of this invention. In Fig. 1, 2-1 is the first wire electrode, 2-2 is the second wire electrode, and 2-2 is the second wire electrode.
It is a wire electrode. The first wire electrode 2-1 is fed from the first supply reel 4-1 through pulleys 6-1 and 6-1.
It is wound onto the take-up reel 8-1 at a constant speed. Similarly, the second wire electrode 2-2 is also wound on the second take-up reel 8-2 via pulleys 6-2 and 6-2 sent from the second supply reel 4-2. The first and second wire electrodes 2-1 and 2-2 connect to the first power supply 12-1 and the second power supply 12-2 via the first power supply plate 10-1 and the second power supply plate 10-2, respectively. Connected to the pole side. These two wire electrodes 2-1 and 2-
The workpiece 14 to be machined by electric discharge between the two is connected to the other pole sides of the first power source 12-1 and the second power source 12-2. This workpiece 14 is operated by a servo motor MX-
The two wire electrodes 2-1 and 2-1 are placed on an X-Y axis table 16 that moves in the X and Y directions by M and y.
Move it to 2-2.

During machining, a machining liquid is supplied between the first and second electrodes 2-1 and 2-2 and the workpiece 14 by a supply device (not shown), and the first and second power supplies 12-1 and 12-2 are used to supply machining fluid. The workpiece 14 is electrically discharged, the two wire electrodes 2-1 and 2-21 are sequentially positioned along substantially the same machining locus of the workpiece 14, and the X-Y axis table 16 is moved. Perform rough machining and finishing machining simultaneously. Therefore, the first and second
Up and down 2 for adjusting the relative position of wire electrodes 2-1 and 2-2
The adjustment mechanism 18 is configured to sequentially position the first and second wire electrodes 2-1 and 2-2 along the same machining trajectory. A control section 20 is provided to control the operation.

Two adjustment mechanisms 18 are provided symmetrically above and below the workpiece 14 between them. Since the upper and lower adjustment mechanisms 18 have the same configuration, - will be described below. As shown in FIGS. 2 and 3, the adjustment mechanism 18 includes first and second holders 22-1 that respectively hold the first wire electrode 2-1 and the second wire electrode 2-2 in parallel and in a feedable manner. - 22-2 is provided in the main body 24.

The main body 24 is inserted into the first holder 22-1 in the vertical direction to rotatably hold the main body 24, and the positioning gear 26 is fixed to the lower end. This positioning gear 26 is fixedly supported on the main body bed side (not shown) of this processing apparatus, and meshes with a drive gear 28 of a servo motor Me fixedly installed on the main body 24. Further, the main body 24 is provided with a sliding body 30 that can horizontally reciprocate and slide relative to the first holder. This sliding body 3
0 includes a screw shaft 32 rotated by a servo motor Mr.
are engaged with each other, and the second holder 22-2 is inserted therethrough in the vertical direction. In this configuration, when the motor Mθ is driven, the drive gear 28 revolves around the positioning gear 26 while rotating, and horizontally rotates the main body 24 about the first holder 22-1. Further, when the servo motor Mr is driven, the sliding body 30 approaches and separates from the first holder 22-1 due to the rotation of the screw shaft 32. Therefore, by driving the servo motor Mg-Mr, the second
The position of the wire electrode ti2-2 relative to the first wire electrode 2-1 can be adjusted. That is, as shown in FIG. 3, the center of the first wire electrode 2-1 is the origin O, and the
Set the axis and set the coordinates of the second wire electrode 2-2 (x, y)
Then, the second wire electrode 2 is driven by the servo motor M.
The angle θ between −2 and the XjY axis is θ−tan −. Also, the origin 0 of the second wire electrode 2-2 is driven by the servo motor Mr.
The distance %lir is r=j77? become. This results in
The relative position of the second wire electrode 2-2 with respect to the first wire electrode 2-1 can be adjusted. For example, after rough machining by the first wire electrode 2-1, the second wire electrode 2-2
Adjustment is made so that the second wire electrode 2-2 is positioned along the locus of the rough machining of the first wire electrode 2-1 so as to perform finishing machining.

The operation of this adjustment mechanism 18 is controlled by a control section 20. The control unit 20 drives and controls each of the servo motors Mθ and Mr of the adjustment mechanism 18, which are two symmetrically provided vertically between the workpieces, and controls the first and second wire electrodes 2-1 and 2-2. The position of the second wire electrode 2-2 relative to the first wire electrode 2-1, that is, θ-tan1- and rn are adjusted so that the second wire electrode 2-2 is sequentially positioned along substantially the same machining trajectory. The control unit 20 also controls the servo motor Mx-M of the X-Y axis table 16.
y is driven and controlled, and the workpiece 14 is moved relative to the first wire electrode 2-1.

The effect of this configuration will be explained.

During machining, first, the X-Y axis table 16 is moved by the control unit in response to a positioning command so that the machining start point of the workpiece 14 approaches the first and second wire electrodes 2-1 and 2-2. When the first interpolation command is input, the first wire electrode 2-
The X-Y axis table 16 is moved so as to perform the interpolation for 1. At this time, the second wire electrode 2-2 is
The adjustment mechanism 18 is operated and controlled by the control unit 20 so as to perform interpolation to the position of the first wire electrode 2-1 at the start of processing. First wire electrode 2- at the start of processing
When the interpolation of the second wire electrode 2-2 to position 1 is completed, the adjustment mechanism 18 is actuated and controlled so that the second wire electrode 2-2 performs the first interpolation. Thereafter, the interpolation command executed by the first wire electrode 2-1 is transferred to the second wire electrode 2-1.
The adjustment mechanism 18 is controlled so that -2 is subsequently executed sequentially. Therefore, the first wire electrode 2-1 and the second wire electrode are located sequentially along substantially the same machining trajectory, and the X-
By moving the Y-axis table 16, the workpiece is processed simultaneously using two wire electrodes. As a result, the first wire electrode 2-1
If the processing using the second wire electrode 2-2 is used as rough processing and the processing using the second wire electrode 2-2 is used as finishing processing, the processing time can be significantly shortened.

The operation of this processing will be explained in more detail with reference to FIG. In the figure, the first control circuit 34-1 drives the servo motors M x - M y according to the X-Y command, and
It controls the movement of the x-y axis table 16 with respect to the wire electrode 2-1, and is similar to the conventional two-axis orthogonal coordinate NC control circuit. The second control circuit 34-2 controls the operation of the adjustment mechanism 18.

The second control circuit 34-2 has a pulse distributor into which an xy command is input, and the distribution output of this pulse distributor and the first
The distribution output of the pulse distributor of the control circuit 34-2 is input to two counters, and the relative positions X and y of the second wire electrode 2-2 with respect to the first wire electrode 2-1 are memorized, respectively. The outputs of the two counters of ty are expressed in polar coordinates (tan + ~
Completed? ) and drives the servo motor Mθ·Mr to control the operation of the adjustment mechanism 18. Thereby, the position of the second wire electrode 2-2 with respect to the first wire electrode 2-1 is adjusted. The speed command is given by the first and second control circuits 34-1
- Distributed to each pulse distributor 34-2.

At the time of positioning command, the same command is issued for both the X-Y command and the x-y command. Depending on this, the first and second wire electrodes 2
The relative positions of -1 and 2-2 do not change. When commanding interpolation, the first control circuit 34-1 is commanded to perform the first interpolation as a command to X-YF', and controls the movement of the X-Y axis table 16 with respect to the first wire electrode 2-1, and also performs second control. circuit 34
-2, commands linear interpolation to the initial position of the first wire electrode 2-1 as an X/y command to control the operation of the adjustment mechanism 18. After the second wire electrode 2-2 reaches the initial position of the first wire electrode 2-1, the second wire electrode 2-2 sequentially executes the interpolation command of the first wire electrode 2-1. The adjustment mechanism 18 is operated and controlled so as to. At this time, the relative positional relationship between the first wire electrode 2-1 and the second wire electrode 2-2 is constantly updated by the relative position X and relative position y counters. Accordingly, the servo motors Me and Mr of the adjustment mechanism 18 adjust the position of the second wire electrode 2-2.
is driven, and the second wire electrode 2-2 is subsequently positioned along a machining locus that is substantially the same as the machining locus on which the first wire electrode 2-1 was positioned. As a result, the workpiece 14 is first processed by the first wire electrode 2-1, and then processed by the subsequent second wire electrode 2-2. Therefore, by performing rough machining using the first wire electrode 2-1 and then performing finishing machining using the second wire electrode 2-2, the second wire electrode 2-2 is The processing can be completed in the time added to the time required to process the distance r from the one-wire electrode 2-1. Therefore, machining time can be significantly reduced and machining can be completed in a short time.

In this embodiment, the position of the second wire electrode 2-2 was adjusted with respect to the first wire electrode 8i2-1, but the position of the first wire electrode 2-1 with respect to the second wire electrode 2-2 was adjusted. It is also possible to have a configuration that adjusts.

It is also possible to set calculation conditions to keep r constant and adjust the position of one wire electrode with respect to the other wire electrode by θ. In this case, since the other wire electrode does not have a constant speed, it is necessary to change the machining power applied to the wire electrode according to the speed in terms of machining accuracy.

Furthermore, two or more wire electrodes can be provided and positioned sequentially along substantially the same machining locus, and machining can be performed three times in sequence, for example, rough machining, intermediate machining, and finishing machining.

[Effects of the Invention] As described above, according to the present invention, the relative positions of the two wire electrodes are adjusted by the control unit and the two wire electrodes are sequentially positioned along substantially the same machining locus, so that the relationship between the wire electrode and the workpiece is improved. A single relative movement can complete rough and finish machining of the workpiece. Therefore, machining time can be significantly reduced and machining can be completed in a short time.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a schematic perspective view of the device, FIGS. 2 and 3 are a perspective view and a plan view of the adjustment mechanism, and FIG. 4 is a control circuit block diagram of the control section. In the figure, 2-1 is a first wire electrode, 2-2 is a second wire electrode, 14 is a workpiece, 16 is an X-Y axis table,
18 is a wire electrode position adjustment mechanism, 20 is a control unit, and 34-
1 is a first control circuit, 34-2 is a second control circuit, Mx-M
Y-Mθ·Mr is a servo motor.

Claims (1)

[Claims] In a wire-cut electric discharge machining device that processes the workpiece by relatively moving the wire electrode and the workpiece while causing an electric discharge between the wire electrode and the workpiece that are fed in the extending direction, At least two of the wire electrodes are provided, and a wire electrode position adjustment mechanism is provided to adjust the relative positions of the two wire electrodes, and the two wire electrodes are sequentially positioned along substantially the same machining locus. A wire-cut electric discharge machining apparatus characterized in that a control section is provided to control the operation of the wire electrode position adjustment mechanism so as to perform rough machining and finish machining of a workpiece at the same time.