JP4501244B2 - NC device for electric discharge machining and electric discharge machining method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to improvements in an NC machine for electric discharge machining and an electric discharge machining method for machining a workpiece by generating an electric discharge between an electrode and the workpiece.
[0002]
[Prior art]
FIG. 6 is a block diagram showing a conventional NC device disclosed in Japanese Patent Laid-Open No. 7-295619. In FIG. 6, 101 is a standard database in which standard tools and machining condition data are registered, and 102 is a user-specific database. User-specific database in which tool and machining condition data are registered, 103 is an input means for adding or modifying the contents of the user-specific database 102, 104 is a machining process information input means for inputting machining process information, and 105 is a tool and machining conditions Is a tool / machining condition automatic determination means for automatically determining the NC, 106 is an NC data generating means for generating NC data based on the automatically determined tool and machining conditions, and 107 is an NC execution section for performing machining based on the NC data. , By incorporating the know-how of skilled workers into the database, tools and machining conditions can be automatically determined It is intended.
[0003]
Japanese Patent Laid-Open No. 10-143231 discloses a machining information management system for collecting and managing machining information. This is because the machining information computer and NC device are connected to the network, the machining information linked to each level is read from the machining information computer and displayed by the NC device, and selectable items in the displayed hierarchy are selected. With respect to a machining information management system for reading another linked item from a machining information computer and displaying it, machining control information necessary for machining control of the NC device is displayed in the NC device. This is a machining information management system that includes a fetching unit and a unit that performs machining using the fetched machining control information, and can improve the operability of the operator.
[0004]
[Problems to be solved by the invention]
Due to the rapid advancement of science and technology in recent years and the enhancement of industrial competitiveness, the demand for highly accurate machining with high reproducibility is rapidly increasing for electric discharge machining.
[0005]
In electrical discharge machining, NC program programmers of electrical discharge machines create NC programs corresponding to drawings that describe machining shapes and specifications, and workers set various NC devices, set electrodes and workpieces. After machining, the workpiece is machined using the NC program. However, during a series of operations such as adjustment of machining conditions and setup work to set the workpiece on the surface plate. When there is something that requires the operator's know-how or the individual wrinkles of each worker are entered, even if the work is performed with reference to the same drawing, the set position and direction of the work piece will shift. There is. Furthermore, even if the set position of the workpiece is the same, details such as which part of the workpiece is used and in which direction the machining is performed vary depending on the operator.
[0006]
In EDM machines, the peak value of machining current and the no-load voltage change depending on the position of the workpiece relative to the surface plate, so the distance between the electrode and workpiece during machining changes, resulting in machining accuracy errors. Cause. Furthermore, even if the workpiece has the same dimensions as the original, the workpiece to be processed first and the workpiece that has already been processed and hollowed out have a peak current due to current wraparound. Differences occur.
[0007]
Although the setup work and the state of the workpiece have a great influence on the machining accuracy especially in high-precision machining, the setup information and the workpiece information are included in the machine drawings or specifications. However, the current situation depends exclusively on the memory and experience of workers. Therefore, even if machining is performed using the same NC program using the same mechanical drawing, there is a problem that the machining result varies depending on the operator.
[0008]
In the NC device disclosed in Japanese Patent Laid-Open No. 7-295619, the know-how of skilled workers is systematized, but the information is mainly used to generate machining conditions, and the optimum machining conditions are searched. However, there is a problem that processing reproducibility deteriorates because there is no handling of setup information or the like. In addition, in order to generate only one processing condition, all the know-how of skilled workers must be converted into electronic data and processed as information that can be used in the system. There was a problem that it occurred.
[0009]
Further, in the machining information management system disclosed in Japanese Patent Laid-Open No. 10-143231, the setting of the NC device can be simplified, but there is no disclosure of specific work contents, and consideration of machining reproducibility is not required. Not done.
[0010]
The present invention has been made to solve the above-described problems. In the electric discharge machining operation, the same machining as the previous machining is performed using the same NC program as the previous machining. It is an object to obtain an NC machine for electric discharge machining and an electric discharge machining method capable of easily constructing a database capable of reproducing the machining, thereby performing highly accurate machining with high reproducibility. To do.
[0011]
[Means for Solving the Problems]
An NC apparatus for electric discharge machining according to the present invention executes an NC program machining command for performing predetermined machining on a workpiece by an NC execution unit, and generates an electric discharge between the workpiece and an electrode. In the NC apparatus for electric discharge machining for machining the workpiece, the storage means storing machining information including setup information and the machining information saved in the storage means are used to set up the workpiece. And a control means for controlling a machining operation including the operation.
[0012]
The NC device for electric discharge machining according to the present invention executes a machining command of an NC program for performing predetermined machining on a workpiece by an NC execution unit, and discharges between the workpiece and an electrode. In an electrical discharge machining NC device that generates and processes the workpiece, storage means for storing machining information, input means for inputting first input information including setup information, and the input means Saving means for saving the inputted first input information and second input information including the NC program in the storage means, selection means for selecting processing information in the storage means, and selection by the selection means Identifying means for identifying whether the processed information is information to be displayed or information to be set in the NC execution unit, and the processing information identified by the identifying means is information to be displayed In case Display means for displaying this information, and setting means for setting this information in the NC execution section when the machining information identified by the identification means is information set in the NC execution section It is.
[0013]
Further, the NC apparatus for electric discharge machining according to the present invention stores machining result information in the storage means.
[0014]
Further, the NC apparatus for electric discharge machining according to the present invention is constructed by constructing a database for collectively managing machining information for each set-up information in the storage means.
[0015]
The NC apparatus for electric discharge machining according to the present invention includes an input / output means for exchanging machining information with another NC apparatus for electric discharge machining.
[0016]
The electric discharge machining method according to the present invention is the electric discharge machining method for machining the workpiece by generating an electric discharge between the workpiece and the electrode. The first machining for machining the first workpiece. A second step of storing processing information including setup information in the first step in the storage means, and a setup of the second workpiece using the processing information stored in the storage means. And a third step of performing a processing operation including the operation.
[0017]
The electric discharge machining method according to the present invention is an electric discharge machining method for machining the workpiece by generating an electric discharge between the workpiece and the electrode, and is controlled by the first NC device for an electric discharge machine. A first step of machining the first workpiece by the first electric discharge machine, and machining information including setup information in the first step of the first electric discharge machine NC device. A second step of saving in the first storage means, and a third step of saving the machining information saved in the first storage means in the second storage means of the NC device for the second electrical discharge machine. The second discharge controlled by the NC device for the second electric discharge machine using the machining information stored in the second storage means to perform the machining work including the setup work of the second workpiece. And a fourth step performed by the processing machine.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a configuration diagram showing an NC apparatus for electric discharge machining according to Embodiment 1 of the present invention, and shows an example of use in wire electric discharge machining. In FIG. 1, 1 is storage means, 2 is a machining information database built in the storage means 1, 3 is control means, 4 is input means, 5 is an NC execution unit, 6 is first input information, and 7 is first input information. 2 is input means, 8 is selection means for selecting machining information, 9 is identification means for identifying the machining information selected by the selection means 8, 10 is setting means for setting machining information in the NC execution unit 5, and 11 is saved. Means 12 is a display means. For example, the first input information 6 input from the input means 4 by the operator is used for machining as machine drawing, electrode information, workpiece information, setup information, etc. of the processed product, and second input information 7 The NC program, processing conditions, NC setting information, and the like are stored in a predetermined folder of the processing information database 2 by the storage unit 11.
[0019]
FIG. 2 is a block diagram showing an example of the storage state of data in the machining information database 2. In FIG. 2, 13 is a folder made up of, for example, drawing numbers, 14 is an operator input information folder, and 15 is NC execution unit setting information. A folder 16 is a processing result folder. The operator input information folder 14 includes mechanical drawings 17, electrode information 18, workpiece information 19 and setup information 20, and the NC execution unit setting information folder 15 includes NC programs 21, processing conditions 22 and NC setting information 23. In the processing result folder 16, processing result information 24 is stored, and processing information for each set-up information is collectively managed for each drawing number as shown in FIG. 2 (the processing information database 2 in FIG. Each code is distinguished by adding alphabets a, b... According to the drawing number).
[0020]
The electrode information 18 is a wire diameter, a wire material, a manufacturing date, a manufacturing number, and the like. A workpiece information 19 is a size, a material, a manufacturing date, a manufacturing number, and the like of the workpiece. The NC setting information 23 is an on / off state of the NC function related to machining, mirroring, figure rotation, axis position, and the like.
[0021]
FIG. 3 is an explanatory diagram showing an example of the setup information 20, in which 25 is a surface plate of a wire electric discharge machine, 26 is a workpiece, 27 is a machining shape, and 28 is a corner portion of the workpiece 26. It is.
[0022]
The setup information 20 in FIG. 2 is the position and direction of the workpiece 26 set on the surface plate 25 in FIG. 3, the fixing means and fixing position of the workpiece 26, and the machining shape 27 with respect to the workpiece 26. Information such as position.
[0023]
As a method for inputting the position information of the workpiece 26, for example, the shape of the workpiece 26 is selected from a plurality of shape samples previously provided as templates, and the size of the workpiece 26 and the direction of setting on the surface plate 25 are set. It is possible to input the position information of the workpiece 26 by inputting a numerical value and detecting a predetermined corner position 28 by detecting a contact position with an electrode when the workpiece 26 is actually set on the surface plate 25. Further, the position of the machining shape 27 with respect to the workpiece 26 can be automatically input from the position information of the actual machining and the position information of the workpiece 26.
[0024]
As described above, it is possible to easily construct a machining information database including setup information that enables reproduction of machining performed last time.
[0025]
Further, by inputting and saving information such as machining time, machining speed, machining voltage and machining accuracy as machining result information 24, not only can the machining accuracy corresponding to the machining conditions and setup conditions be grasped, but the next time By comparing with the processing result based on the same condition, it can be used as analysis information of the processing itself.
[0026]
FIG. 4 is an explanatory diagram showing an example in which machining information stored in the machining information database 2 is extracted and used. In the figure, 29 is first output information, and 30 is second output information. 1 denote the same or corresponding parts.
[0027]
In FIG. 4, the identification unit 9 is information read from the predetermined folder of the machining information database 2 by the selection unit 8 is information to be displayed on the display unit 12 or is information set in the NC execution unit 5. Identify When this identification result is information to be displayed on the display means 12, it is displayed on the display means 12 as the first output information 29, and when this identification result is information to be set in the NC execution unit 5 This information (for example, NC program used for machining, machining conditions, NC setting information, etc.) is set as the second output information 30 in the NC execution unit 5 by the setting means 10.
[0028]
By referring to, for example, electrode information, workpiece information, setup information, and the like displayed on the display unit 12, the operator can perform setup work in exactly the same manner as the previous work.
[0029]
As described above, when processing information including setup information etc., which is first performed by a skilled worker, is stored and managed in a batch in the processing information database, By referring to the collective information regarding processing and performing the processing operation based on this information, the operator can perform highly reliable processing operations with high reproducibility regardless of the skill level of the operator. Further, there is no need for an operation for generating new data from the collective information.
[0030]
In the above description, the collective information is managed by the drawing number. However, it is only necessary to be able to discriminate and manage the data group. May be.
[0031]
In addition, since it is not necessary for each information to have a format of one file, all information may be saved as one file.
Furthermore, although each information is classified hierarchically by each folder, it is only necessary that the information can be selected by the selection means 11, for example, and it is not always necessary to have a hierarchical structure.
[0033]
Furthermore, since various information relating to machining stored in the machining information database in FIG. 2 includes a lot of information unique to the NC apparatus, the information is not limited to the information as shown in FIG.
[0034]
In the above description, the case where the collective information is managed as a file in a folder has been described. However, the present invention is not limited to such a configuration. The collective information may be managed as follows. For example, even if the control unit 3 and the plurality of storage units shown in FIG. 1 are connected to the network and the processing information is distributed and stored in the plurality of storage units, it is only necessary that each information can be managed collectively.
[0035]
Moreover, in the above description, although the case where the NC device for electric discharge machining according to the present invention is used for wire electric discharge machining has been described, the same configuration can be adopted even when it is used for electric discharge machining.
[0036]
Embodiment 2. FIG.
FIG. 5 is a configuration diagram showing an NC apparatus for electric discharge machining according to Embodiment 2 of the present invention. In the figure, 1a and 1b are storage means, 2a and 2b are machining information databases, 4b is input means, and 5b is NC execution unit, 12b is a display means, 29b is first output information, 30b is second output information, 31a is a first NC apparatus, 31b is a second NC apparatus, and 32a and 32b are input / output means. . The processing information database 2a stores collective information related to processing including setup information similar to that of the first embodiment.
[0037]
For example, after performing machining with a first electric discharge machine (not shown) controlled by the first NC apparatus 31a, the same machining is performed with a second electric discharge machine (not shown) controlled by the second NC apparatus 31b. In this case, the storage information of the machining information database 2a is written out by the input / output means 32a of the first NC device 31a, and this is stored in the machining information database 2b by the input / output means 32b of the second NC device 31b of the second electric discharge machine. By copying the machining information of the first NC device 31a (for example, folder No. 1 of the machining information database 2a in FIG. 5) and storing it in the machining information database 2b of the second NC device 31b, Even in the second NC device 31b, the first output information 29b and the second output information 30b can be obtained. Not only can the NC setting at the time of machining be omitted, but it is also possible to reproduce the same machining as that performed by the first electric discharge machine, facilitating production management with reduced variations in the overall production of processed products. be able to.
[0038]
【The invention's effect】
Since the NC apparatus for electric discharge machining and the electric discharge machining method according to the present invention are configured as described above, the same machining as the previous machining is performed using the same NC program as the previous machining. Therefore, it is possible to reproduce machining operations including set-up operations, and to realize highly accurate machining with high reproducibility.
[0039]
Moreover, system construction is easy, and there is an effect that an increase in cost can be suppressed.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an NC apparatus for electric discharge machining according to Embodiment 1 of the present invention.
FIG. 2 is a configuration diagram illustrating an example of a storage state of data in a machining information database.
FIG. 3 is an explanatory diagram showing an example of setup information.
FIG. 4 is an explanatory diagram showing an example in which machining information stored in a machining information database is extracted and used.
FIG. 5 is a configuration diagram showing an NC apparatus for electric discharge machining according to Embodiment 2 of the present invention.
FIG. 6 is a block diagram showing a conventional NC device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Memory | storage means, 2 Processing information database, 3 Control means, 4 Input means, 5NC execution part, 6 1st input information, 7 2nd input information, 8 Selection means, 9 Identification means, 10 Setting means, 11 Storage means , 12 Display means, 13 folder, 14 Worker input information folder, 15 NC execution part setting information folder, 16 Machining result folder, 17 Machine drawing, 18 Electrode information, 19 Work piece information, 20 Setup information, 21 NC program , 22 Machining conditions, 23 NC setting information, 24 Machining result information, 25 Surface plate, 26 Workpiece, 27 Machining shape, 28 Corner part, 29 First output information, 30 Second output information, 31a First NC device, 31b Second NC device, 32a, 32b Input / output means.

Claims (5)

An electric discharge machining that performs machining of an NC program by executing an NC program machining command for performing predetermined machining on the workpiece by generating an electric discharge between the workpiece and an electrode. NC equipment
Storage means for storing machining information;
Input and mechanical drawing of the workpiece, the electrode information, and the workpiece information, position information of the workpiece, the setup information is information of a fixed and machining shape of the workpiece, the first input information including Input means to
Said first input information entered by said input means, and storage means for storing a second input information including the NC program, to the storage means as said processed information,
Selecting means for selecting processing information in the storage means;
Identifying means for identifying whether the machining information selected by the selection means is information to be displayed necessary to reproduce the machining performed last time, or information to be set in the NC execution unit;
Display means for displaying the first input information when the processing information identified by the identification means is information to be displayed;
A setting unit for setting the second input information in the NC execution unit when the machining information identified by the identification unit is information set in the NC execution unit;
An NC apparatus for electric discharge machining, comprising: The position information of the workpiece in the setup information, in advance a plurality of shape samples were selected from the stored template to detect the corner positions of a workpiece by contact position detection by the electrodes, the position of the workpiece The NC apparatus for electric discharge machining according to claim 1, wherein the NC apparatus is input as information.   The NC apparatus for electrical discharge machining according to claim 1 or 2, wherein machining result information of machining time, machining speed, machining voltage is stored in the storage means.   The NC apparatus for electric discharge machining according to any one of claims 1 to 3, wherein a database for collectively managing machining information for each set-up information for each drawing number is constructed in the storage means.   The NC apparatus for electric discharge machining according to any one of claims 1 to 4, further comprising input / output means for exchanging machining information with another NC apparatus for electric discharge machining.

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