JPH11114728A - Electric discharge machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform the modification and readjustment of working conditions even in the midway off machining as observing a machining state. SOLUTION: In this electric discharge machine equipped with a machining tool and its driving means, an NC means controlling this driving means, a display input-output command means, and a command processing means processing a machining command from this display input-output command means, the display input-output command means 7 is equipped with a means 20 composing a machining program on the basis of graphic data to be secure from a CAD and preset working conditions, a means 21 composing a machining command on the basis of a machining program, a means 22 transmitting this machining command, a means 23 recognizing a machining state, and a means 24 performing a picture display and an input process, and in this constitution, during machining progress, the machining program or the machining command or both are made so as to do interrupt modification.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electric discharge machine,
More particularly, the present invention relates to an electric discharge machine capable of re-adjusting machining conditions and a machining program while performing machining in accordance with a machining state which tends to change when performing fine electrical discharge machining.

[0002]

2. Description of the Related Art In a conventional electric discharge machine using NC control, as shown in FIG. 12, a machining shape is created from graphic data obtained from CAD (step S31), and a machining process is designed based on the machining shape. (Step S32), the operation of converting the machining process into a machining command (Step S33) is performed by the CAM, and the machining command is transmitted to the electric discharge machine online or offline to perform the machining process control (Step S35).

[0003]

However, in the electric discharge machine having the above-mentioned structure, when machining in the order of minute μm, the wear of the machining tool, impurities of the workpiece and machining waste, etc., cause the progress of machining and machining. Accuracy may be affected. Therefore, there is a problem that machining does not proceed with only an open-loop machining command, and furthermore, it is not possible to correct or readjust machining conditions and the like during machining.

An object of the present invention is to provide an electric discharge machine capable of correcting and re-adjusting machining conditions even during machining according to a machining state in view of the above-mentioned conventional problems.

[0005]

An electric discharge machine according to the present invention comprises:
A processing tool for processing the workpiece, a driving unit for relatively driving the workpiece and the processing tool, a display input / output instruction unit, and processing a processing instruction from the display input / output instruction unit, In an electric discharge machine provided with electric discharge machining control means for performing NC control and electric discharge machining control, a display input / output instruction means creates a machining program based on graphic data obtained from a CAD and set machining conditions. Means for creating a machining command based on a machining program, means for transmitting the machining command, means for obtaining machining state information, means for interrupting and modifying the machining program and / or the machining command during machining, It has display command means, and can change the processing program and processing command while watching the processing state during processing, and while processing the workpiece It is possible to improve the engineering accuracy.

[0006] Preferably, the machining program creating means of the display input / output command means includes a part or the whole of the machining conditions stored in a database or the like, the workpiece, and the dimensional shape information of the machining tool as the machining conditions. With reference to the figure, the configuration is such that the error between the workpiece shape and the graphic data is minimized.

Further, the display input / output command means includes means for re-adjusting the processing conditions based on the processing state information, the processing state information, and the shape of the workpiece based on the information of the workpiece or the tool or both. Means for redesigning the machining program so as to minimize the error between the data and the graphic data.

In addition, the display input / output command means monitors the machining state information and operates the machining program displayed on the screen by key operation or at the time of operation of the means for readjusting the machining conditions and the machining program redesign means. It is configured such that it can be modified in a screen interactive manner by operating the pointing device or both of them.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an electric discharge machine according to the present invention will be described below with reference to FIGS.

In FIG. 1, an electric discharge machine 1 has a fixed base 3 for fixing a workpiece 10, an XY drive stage 2 for driving the fixed base 3 in X and Y directions, A machining tool 4 for machining and a machining tool driving means 5 for driving the machining tool 4 in the Z direction are provided, and the electric discharge machining control means 6 is configured to perform NC control and electric discharge machining control.
Further, the electric discharge machining control means 6 is controlled by a display input / output instruction means 7 having a control shell and an input means 8 such as a keyboard and an input means 9 such as a pointing device attached thereto.
The display input / output instruction means 7 may be constituted by a personal computer. FIG. 2 shows that the processing tool 4
Shows an example of a state in which contour processing is performed.

Next, the processing in the electric discharge machining control means 6 will be described with reference to FIG. A processing command processing block 16 for processing a processing command from the display input / output command means 7, and a RAM 13 for recording and storing processing parameters based on the processing command
An NC control block 14 for controlling the XY drive stage 2 and the processing tool driving means 5 based on the processing parameters;
It comprises an electric discharge machining control block 15 for controlling the electric discharge circuit block 25 and a CPU 11 for controlling based on a program registered in the ROM 12.

Next, the configuration of a control shell in the display input / output instruction means 7 will be described with reference to FIG. The control shell includes a CAD task 18 for obtaining graphic data from CAD, a task 19 for setting processing conditions, and a task 20 for creating a processing program by calculating NC control data from the set processing conditions and graphic data. ,
A machining command creation task 21 for converting a machining program into a machining command, a machining command transmission task 22 for transmitting a machining command to the electric discharge machining control means 6, a machining state recognition task 23 for receiving a machining state from the electric discharge machining control means 6, And a multi-task control shell 17 for controlling these tasks.

Each task of the control shell is designed to minimize an error between the shape of the workpiece and the graphic data based on the machining state information and the dimensional shape information of the workpiece and / or the processing tool. The NC control data and machining conditions are corrected, the machining program is redesigned, and the redesigned machining program is transmitted to the electric discharge machining control means 6.

The processing program and the processing command are displayed on the screen 7a of the display input / output command means 7 while monitoring the processing state by the keyboard 8 or the pointing device 9.
Alternatively, there is also provided a screen display input processing task 24 which is changed interactively by both of them.

Next, the operation of the display input / output instruction means 7 will be described with reference to FIG.
This will be described with reference to the flowchart shown in FIG. Step S
In step 1, a final machining shape of a workpiece is created based on a CAD drawing. In step S1, a processed shape during the processing is also created. Subsequently, in step S2, a processing procedure and processing conditions are set. In the case of a round hole shape or a slit hole shape, the setting is performed for each hole. In the case of contour processing, the processing shape is divided to include a processing interrupt. Furthermore, a tool path is set according to the diameter of a processing tool such as an electrode, and a processing program is created. At this time, a machining program in which a tool path is corrected in consideration of a consumption amount of a machining tool is created by referring to machining conditions stored in a database or the like (step S3). Here, the machining condition means a condition set first such as a dimension shape of a machining tool, a machining speed, an electric discharge machining energy amount, and the like.

Next, a machining command necessary to move the machining tool is generated in step S4 based on the machining program created in step S2, and drive control of the machining device is performed in step S5. In step S6, a recognition of the machining shape in the middle of the machining process is performed. If the machining shape in the middle of the machining process is out of the allowable range with respect to the target machining shape, a tool path change interruption process is performed (step S7). The consumed amount of the working tool in use is taken in, the tool path according to the current dimension and shape is recalculated, the working program is redesigned, and the processes of steps S1, S2 and S3 are executed again. However, during this, step S5 continues the processing.

On the other hand, if there is an abnormality in the progress of machining based on machining state information such as electric discharge short circuit information in step S6, machining condition change interruption processing such as machining speed and electric discharge machining energy amount initially set. (Step S
8) After resetting the processing conditions, the processes of steps S2 and S3 are executed again. However, during this time, step S
5 continues processing.

In step S6, the machining state is recognized to determine whether or not a situation that requires a change in the machining process such as breakage of the machining tool occurs. If there is an abnormality, the machining process is directly changed. Processing command change interruption processing is performed (step S9), and a processing command is newly created in step S4.

Next, these steps S6, S7, S8,
The processing of S9 will be described with reference to FIG. While the machining is in progress, a machining program and machining conditions are input and set interactively on the screen from the machining state information (step S10) (steps S11 to S14). Then, after confirming the change (step S16), a recalculation process is performed (step S17), and the machining command is corrected and rewritten (step S18). Then, the corrected machining command is issued (step S15), the current machining process is interrupted (step S19), the machining process is changed and analyzed (step S20), and the machining command is executed (step S2).
1).

FIG. 7 shows an example in which the processing state is recognized visually or by a camera or the like at the point A during the processing of the contour, the processing conditions are changed on the computer screen, and the processing speed is changed at the point B. I have.

FIG. 8 shows that, in the contour processing, the processing is started from a point A, and the tool path is changed and corrected by inputting the amount of consumption of the processing tool diameter from a point B from the point B for the consumption of the processing tool. An example is shown. The initial tool path 26 is shown by a broken line, and the actual tool path 27 after correction is shown by a solid line.

FIG. 9 shows a case where the amount of consumption of the machining tool is known in advance and the tool path 28 is determined by linearly interpolating the amount of feeding of the machining tool (Z direction) from the estimated amount of consumption 29 in advance. An example is shown.

At the time of the above-mentioned processing, a window as shown in FIG. 10 is displayed on the screen 7a, and the progress of the processing program and the processing state can be confirmed. In FIG. 10, 31 is a column for the number of steps, 32 is a machining program display column, and 33 and 34 are machining state display columns. further,
By selecting (selecting with a pointing device) an unprocessed step No. part in the column 31 of the number of steps, a processing condition setting screen 35 in an interactive table format as shown in FIG. 11 is displayed. You can enter the necessary conditions. By inputting and setting here, a processing command is automatically created and processing is performed. Therefore, even if the operator (operator) changes the processing conditions and the like, it can be executed without re-creating the program, and the processing conditions can be optimally adjusted while observing the processing state.

[0024]

According to the electric discharge machine of the present invention, as apparent from the above description, the machining program and the machining command can be changed while observing the machining state during machining, and machining of the workpiece can be performed. Machining accuracy can be improved as it progresses, and therefore, when performing electric discharge machining on the order of micrometer, suppressing machining progress and adverse effects on machining accuracy due to wear of machining tools, impurities of workpieces, machining chips, etc. be able to.

Further, if the machining program displayed on the screen can be modified in a screen interactive manner by a key operation, a pointing device operation or both operations, the interactive program can be easily monitored while monitoring the machining state information. By inputting a simple screen, the path of the machining tool can be corrected and the machining condition can be readjusted.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of an electric discharge machine of the present invention.

FIG. 2 is a perspective view of a processing state in the embodiment.

FIG. 3 is a configuration diagram of an electric discharge machining means in the embodiment.

FIG. 4 is a configuration diagram of a display input / output instruction unit in the embodiment.

FIG. 5 is an operation flowchart in the embodiment.

FIG. 6 is a detailed operation flowchart in the embodiment.

FIG. 7 is an explanatory diagram of a processing example according to the embodiment.

FIG. 8 is an explanatory diagram of another processing example in the embodiment.

FIG. 9 is an explanatory diagram of still another processing example in the embodiment.

FIG. 10 is an explanatory diagram of a screen display example in the embodiment.

FIG. 11 is an explanatory diagram of a screen display example when a processing condition is changed in the embodiment.

FIG. 12 is an operation flowchart of a conventional electric discharge machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric discharge machine 2 XY drive stage 3 Fixed base 4 Machining tool 5 Machining tool drive means 6 EDM control means 7 Display input / output instruction means (PC) 8 Input means (keyboard) 9 Input means (pointing device) 10 Workpiece 14 NC control block 15 EDM control block 16 Machining instruction processing block 17 Multitask control shell 18 CAD task 19 Machining condition setting task 20 Machining program creation task 21 Machining instruction creation task 22 Machining command transmission task 23 Machining state recognition task 24 Screen display Input processing task

Claims (5)

[Claims] 1. A processing tool for processing a workpiece, a driving means for relatively driving the workpiece and the processing tool, a display input / output command means, and a processing command from the display input / output command means. And a display input / output instruction means for performing machining based on graphic data obtained from the CAD and set machining conditions in the electric discharge machine provided with electric discharge machining control means for controlling the drive means and performing electric discharge machining control. Means for creating a program, means for creating a machining command based on a machining program, means for transmitting a machining command, means for obtaining machining status information, and interrupting a machining program or a machining command or both during machining. Means to correct;
An electric discharge machine having display command means. 2. A machining program creating unit refers to machining conditions, workpieces, and some or all of the dimensional shape information of a machining tool stored in a database or the like, and associates the workpiece shape with the graphic data. 2. The electric discharge machine according to claim 1, wherein an error is minimized. 3. The electric discharge machine according to claim 1, wherein the display input / output instruction means includes means for readjusting machining conditions based on machining state information. 4. A display program according to claim 1, wherein said display input / output command means executes a processing program so as to minimize an error between a workpiece shape and graphic data based on the processing state information and information on the workpiece and / or the processing tool. 2. The electric discharge machine according to claim 1, further comprising means for redesign. 5. A display input / output instructing means for monitoring the machining state information while operating the machining condition re-adjustment means according to claim 3 and the machining program redesign means according to claim 4, and displaying the information on a screen. An electric discharge machine characterized in that a displayed machining program can be modified in a screen interactive manner by a key operation, a pointing device operation or both operations.