JP2007290088A - Wire electric discharge machine and control method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a wire electric discharge machine easily optimizing a machining condition. <P>SOLUTION: The wire electric discharge machine is equipped with: a machine body 50 which machines a workpiece to a predetermined shape by discharge generated by applying the high frequency pulse voltage, while relatively moving a wire electrode 11 and the workpiece 150 which are guided by a pair of upper and lower nozzles 15a, 15b; and a control device 90A for controlling the behavior of the machine body. The control device comprises: a storage part 55A where a numerical control date for numerically controlling the machine body and a three-dimensional data of the workpiece are stored; a first plate thickness calculation part 60 which calculates the plate thickness at the machining route in the workpiece based on the numerical control data and the three-dimensional data; and a main control part 78A for defining the control content of the machine body using the numerical control data and the plate thickness calculated at the first plate thickness calculation part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wire electric discharge machine that generates an electric discharge between a wire electrode and a workpiece to process the workpiece into a predetermined shape, and a control method thereof.

  A machining fluid is supplied around the wire electrode guided by a pair of upper and lower nozzles, and a high frequency pulse voltage is applied to the wire electrode and the workpiece while moving the table on which the workpiece is placed in a predetermined direction. At this time, the wire electric discharge machine that removes the work piece by small amount by the electric discharge generated between the wire electrode and the work piece and processes the work piece into a predetermined shape is a precision machining such as die machining. Widely used in

  This wire electric discharge machine has a main body of the processing machine and a control device for numerically controlling the operation of the main body of the processing machine, and at the time of shipment so that a user can easily realize a certain level of processing speed and processing accuracy. Standard numerical control data corresponding to the performance of the wire electric discharge machine is installed in the control device in advance. In many cases, this numerical control data is prepared for several patterns for each control item. The user of the wire electric discharge machine uses the standard numerical control data as it is or sets a part of the data and uses it for manufacturing a product such as a mold. Hereinafter, in this specification, the above-described standard numerical control data and data in which a user independently sets a part of the standard numerical control data are collectively referred to as “basic numerical control data”.

  The machining speed and machining accuracy of a wire electric discharge machine depend greatly on the discharge energy between the wire electrode and the workpiece, and this discharge energy is the thickness of the workpiece at the location where the electric discharge machining is performed. It depends greatly on the thickness (hereinafter referred to as “plate thickness”) and the magnitude of the energy of the high-frequency pulse voltage applied between the wire electrode and the workpiece. For this reason, the wire electric discharge machine sequentially calculates the plate thickness from the energy of the high-frequency pulse voltage applied to the wire electrode and the workpiece, the processing speed, and the like, and provides control data corresponding to the plate thickness. The energy of the high-frequency pulse voltage is feedback-controlled by reading from the basic numerical control data. Specifically, the pulse interval of the high frequency pulse voltage to be applied (hereinafter referred to as “pulse pause period”) is feedback controlled.

  However, the machining speed and machining accuracy by the wire electric discharge machine are in a trade-off relationship. When the machining speed is increased, the discharge energy between the wire electrode and the workpiece increases, and the machining accuracy is lowered. On the contrary, when the machining accuracy is increased, the discharge energy between the wire electrode and the workpiece is reduced, so that the machining accuracy is lowered. For this reason, various researches or proposals for improving both the processing accuracy and the processing speed have been made.

  For example, Non-Patent Document 1 discloses a pulse interval (hereinafter referred to as “pulse”) at a high-frequency pulse voltage depending on the installation status of a nozzle for guiding a wire electrode, the thickness of a workpiece (hereinafter referred to as “plate thickness”), and the like. A control method is described in which the length of the “resting period” is controlled, and thereby the workpiece is processed under a maximum processing energy at which the wire electrode is not disconnected to obtain a high processing speed. Further, in Non-Patent Document 1 and Patent Document 1, when processing a portion that becomes a corner portion or a corner portion of a product, the frequency of the high-frequency pulse voltage is lowered according to the radius or angle of the portion, thereby processing accuracy. The processing method which improves is described.

  The wire electrode in a wire electric discharge machine is used in a state of being stretched between a pair of upper and lower nozzles, but due to a processing reaction force generated by an electric discharge between the wire electrode and the workpiece, the wire electrode is formed at the center of the wire electrode. Inevitably bends. For this reason, especially in a non-planar processing region such as a ridge or a curved surface, a difference is likely to occur between the processing shape at the upper and lower portions of the wire electrode and the processing shape at the central portion between the pair of nozzles. As described in Non-Patent Document 1 and Patent Document 1, when the frequency of the high-frequency pulse voltage is reduced (the pulse pause period is lengthened), the above-described processing reaction force is reduced, and as a result, the deflection of the wire electrode is also reduced. Therefore, processing accuracy can be increased.

“High precision and automation in wire electrical discharge machining”, Japan Society for Precision Engineering, 2005/5, Vol.71, No.5, p.550 Republication 2002-36295

  However, the discharge energy generated between the wire electrode and the workpiece during the electric discharge machining is not always stable, and even when a constant high frequency pulse voltage is applied to the wire electrode and the workpiece, the electric discharge machining is performed. However, it fluctuates depending on the presence or absence of machining scraps in the vicinity of the electrical discharge machining location, the vibration state of the wire electrode, and the machining speed also fluctuates accordingly. The plate thickness of the workpiece calculated from the energy of the applied high-frequency pulse voltage and the machining speed is not always accurate.

  For this reason, in the standard numerical control data preinstalled in the conventional wire electric discharge machine, a relatively large margin is set in anticipation of an error in the calculated plate thickness. . For example, the plate thickness value for which a certain length of the pulse pause period is selected from the standard numerical control data is not one, but has a relatively wide width. In the standard numerical control data, there are not so many places that the user can independently set, so the margin remains relatively large even in the numerical control data that the user has set independently. is there.

  Depending on the shape of the workpiece at the electrical discharge machining location and the machining accuracy required for the location, the margin is often excessive. An excessive margin can be an impediment when improving the processing speed or the processing accuracy.

  The present invention has been made in view of the above, and an object thereof is to obtain a wire electric discharge machine that easily optimizes machining conditions and a control method thereof.

  The wire electric discharge machine of the present invention that achieves the above object is based on electric discharge generated by applying a high-frequency pulse voltage while relatively moving the wire electrode guided by a pair of upper and lower nozzles and the workpiece, A wire electric discharge machine having a processing machine main body for processing a workpiece into a predetermined shape and a control device for controlling the operation of the processing machine main body, wherein the control device is numerical control data for numerically controlling the processing machine main body. And a storage unit storing three-dimensional data of the workpiece, a first plate thickness calculation unit that calculates a plate thickness in the machining path of the workpiece based on the numerical control data and the three-dimensional data, and a numerical value And a main control unit that determines the control contents of the processing machine main body using the control data and the plate thickness calculated by the first plate thickness calculation unit.

  Since the wire electric discharge machine of the present invention has the above-described first plate thickness calculation section, the plate thickness of the workpiece can be accurately obtained at the location where the electric discharge machining is actually performed. For this reason, when performing numerical control of the operation of the processing machine main body, the margin to be given to the numerical control data can be reduced as compared with the conventional case, and it becomes easy to optimize the processing conditions. Therefore, according to the wire electric discharge machine of the present invention, it becomes easy to improve at least one of the machining speed and the machining accuracy.

  Embodiments of a wire electric discharge machine according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited to the embodiments described below. Various modifications, modifications, combinations, and the like are possible in addition to the following forms.

Embodiment 1 FIG.
As described above, the wire electric discharge machine of the present invention accurately calculates the plate thickness of the workpiece at the location where the electric discharge machining is actually performed by the first plate thickness calculation unit, thereby providing a margin for the numerical control data. It is possible to make it smaller than the conventional one.

  The numerical control data used in the wire electric discharge machine according to the present invention may be data obtained by reducing the margin on the assumption that the plate thickness of the workpiece is accurately calculated, or the basic one used conventionally. Numerical control data may be used. When the basic numerical control data is used as the numerical control data, the numerical control data for at least one control item selected from the basic numerical control data according to the thickness of the workpiece is calculated or a table Using (array), change to data with a smaller margin than before.

  When the basic numerical control data is used as the numerical control data, the control method of the wire electric discharge machine according to the present invention is based on the numerical control data for numerically controlling the processing machine body and the three-dimensional data of the work piece. A plate thickness calculating step for calculating the plate thickness in the processing path, and a control content determining step for determining the control content of the processing machine body using the numerical control data and the plate thickness calculated in the plate thickness calculating step. .

  FIG. 1 is a configuration diagram schematically showing an example of a wire electric discharge machine according to the present invention. A wire electric discharge machine 100 shown in the figure operates by performing the above-described plate thickness calculation step and control content determination step, and includes a processing machine body 50, a control device 90A, an input device 95, and a display device. 97.

  The processing machine main body 50 is controlled by the control device 90A to discharge-process the workpiece 150 into a predetermined shape, and is driven by the X-axis motor 1 and the Y-axis motor 3 to be an XY plane (horizontal plane). A table 5 moving above, a wire bobbin 10 disposed above the table 5, a wire collection container 12 disposed below the table 5, and a pair of nozzles 15a fixedly disposed above and below the table 5. 15b. In addition, a first guide system 20 a that guides the wire electrode 11 drawn from the wire bobbin 10 to the nozzle 15 a and a second guide system 20 b that guides the wire electrode 11 that exits the nozzle 15 b to the wire recovery container 12 are provided. A tension roller 22a is disposed between the wire bobbin 10 and the first guide system 20a, and a tension roller 22b is disposed between the second guide system 20b and the wire collection container 12.

  The first guide system 20a includes a guide roller 17a disposed above the table 5, and a wire guide 18a disposed above the nozzle 15a. The guide roller 17a guides the wire electrode 11 drawn from the wire bobbin 10 by the tension roller 22a to the wire guide 18a, and the wire guide 18a guides the wire electrode 11 to the nozzle 15a. The wire electrode 11 passes through the nozzle 15 b through the nozzle 15 a and the table 5. On the other hand, the second guide system 20b includes a wire guide 18b disposed below the nozzle 15b and a guide roller 17b disposed below the wire guide 18b. The wire electrode 11 penetrating the nozzle 15b is taken up by the tension roller 22b via the wire guide 18b and the guide roller 17b, and guided into the wire collection area 12.

  The pulling speed of the wire electrode 11 by the tension roller 22b is set faster than the pulling speed of the wire electrode 11 by the tension roller 22a. As a result, tension is applied to the wire electrode 11 by the pair of tension rollers 22a and 22b. The wire electrode 11 travels from the nozzle 15a side to the nozzle 15b side while being stretched between the pair of nozzles 15a and 15b.

  In order to discharge-process the workpiece 150 with the wire electrode 11, the processing machine main body 50 is further provided with a table driving device 25, a processing liquid supply device 30, a power supply device 35, and a voltage detection device 40.

The above table drive apparatus 25 is connected to the X-axis motor 1 by the wiring W _1, is connected to the Y-axis motor 3 by a wire W _2, and supplies driving power to the motors 1,3. Machining liquid supply device 30 is connected to the nozzle 15a by a pipe P _1, it is connected to the nozzle 15b through a pipe P _2, and supplies the working fluid of these nozzles 15a, to 15b. The machining fluid (not shown) supplied to the nozzles 15a and 15b is ejected from the nozzles 15a and 15b to the table 5 side. As a result, the machining liquid is supplied around the wire electrode 11 between the nozzles 15a and 15b.

The power supply device 35 is connected to the wire electrode 11 via the wiring W ₄ and the power supply 33 and is connected to the workpiece 150 via the wiring W ₅ , so that the wire electrode 11 and the workpiece 150 are connected. Supply high-frequency pulse voltage. The voltage detection device 40 is connected to the wiring W ₄ via the wiring W ₇ and is connected to the workpiece 150 via the wiring W ₈ , and the voltage between the wire electrode 11 and the workpiece 150 is detected. Is detected. The workpiece 150 is placed on the table 5.

  On the other hand, the control device 90A controls the operation of the processing machine main body 50, and includes a storage unit 55A, an arithmetic processing unit 80A, and a display control unit 85A. The input means 95 and the display device 97 are connected to the control device 90A.

  The storage unit 55A stores basic numerical control data used for operation control of the processing machine main body 50 and three-dimensional data of the workpiece 150. The basic numerical control data is the standard numerical control data installed by the manufacturer of the wire electric discharge machine 100 in advance according to the performance of the wire electric discharge machine 100 or a part of the standard numerical control data. It has been set independently. The basic numerical control data includes data defining the moving direction and moving amount of the table 5 by controlling the operation of the table driving device 25, and controlling the operation of the machining liquid supply device 30 from the nozzles 15a and 15b. The data specifying the amount of machining fluid ejected and the average voltage, pulse width, and pulse pause period of the high-frequency pulse voltage applied between the wire electrode 11 and the workpiece 150 by controlling the operation of the power supply device 35 Contains data defining the length of.

  Further, the above three-dimensional data is created by, for example, computer-aided design (CAD), and the three-dimensional data includes the three-dimensional shape data and the three-dimensional dimension data of the workpiece 150. It is. The three-dimensional data is stored in the storage unit 55A by the user prior to the electric discharge machining of the workpiece 150.

  The arithmetic processing unit 80A specifically determines the control content of the processing machine body 50 based on the data stored in the storage unit 55A and information obtained from the processing machine body 50, and controls the operation of the processing machine body 50. And includes a first plate thickness calculator 60, a first data changer 75A, and a main controller 78A.

  The first plate thickness calculator 60 calculates the plate thickness of the workpiece 150 on the machining path based on the basic numerical control data and the three-dimensional data stored in the storage unit 55A. That is, the machining path in the workpiece 150 is specified based on the basic numerical control data and the three-dimensional data, and the plate thickness of the workpiece 150 in the machining path is calculated based on the three-dimensional data. The calculation of the plate thickness by the first plate thickness calculation unit 60 corresponds to the plate thickness calculation step in the control method of the wire electric discharge machine of the present invention.

  In the calculation of the plate thickness by the first plate thickness calculator 60, predetermined data for designating the operation timing of the first plate thickness calculator 60 is stored in the storage unit 55A in advance, and the first plate thickness is calculated based on this data. By operating the unit 60, it can be performed continuously along the machining path, or at predetermined intervals, for example, every unit length (unit length on the machining path), every unit time. Alternatively, it may be performed for each module in the basic numerical control data. The above-mentioned interval can be appropriately selected within a range in which the processing distance on the processing path is, for example, not less than the wire diameter of the wire electrode 11 and not more than about several mm.

  75 A of 1st data change parts are the 1st numerical control data about the at least 1 control item selected according to the plate | board thickness of the to-be-processed object 150 among the basic numerical control data stored in the memory | storage part 55A. The thickness is changed based on the thickness calculated by the thickness calculator 60. Specifically, the numerical control data is changed so that the margin set in advance in the numerical control data for the control items is reduced or set to 0 (zero).

  The change of the numerical control data by the first data changing unit 75A depends on, for example, the material and wire diameter of the wire electrode 11 used in the wire electric discharge machine 100, the type of processing liquid, the material of the workpiece 150, and the like. Optimal numerical control data regarding the control items is experimentally obtained for each plate thickness of the workpiece 150, and the optimal numerical control data is converted into a table (array) to be stored separately from the storage unit 55A or the storage unit 55A. It is stored in another storage unit (not shown) provided, and the optimum numerical control data is read out when necessary and replaced with the basic numerical control data for the control items.

  Alternatively, after obtaining the optimal numerical control data experimentally, a conversion equation for converting the basic numerical control data into the optimal numerical control data or the numerical control data approximating the optimal numerical control data is obtained. This is done by converting the basic numerical control data for the control item based on the conversion formula. The above conversion formula is converted into, for example, a logic circuit and incorporated in the first data changing unit 75A. The numerical control data after being changed by the first data changing unit 75A is sent to the main control unit 78A.

  The main control unit 78A uses the basic numerical control data stored in the storage unit 55A and the numerical control data sent from the first data changing unit 75A to control details of the processing machine body 50, specifically a table. Control contents of the operations of the drive device 25, the machining liquid supply device 30, and the power supply device 35 are determined, and the operation of the processing machine body 50 is controlled. When the numerical control data for the control item selected according to the thickness of the workpiece 150 is different between the basic numerical control data and the numerical control data after the change by the first data changing unit 75A, the main control unit 78A The operation of the processing machine body 50 is controlled with priority given to the numerical control data sent from the first data changing unit 75A. The change of the numerical control data by the first data changing unit 74A and the determination of the control content by the main control unit 78A correspond to the control content determining step in the control method of the wire electric discharge machine of the present invention.

  The display control unit 85A reads predetermined data stored in the storage unit 55A, and displays, for example, information such as processing conditions in the processing machine main body 50 and an operation status of the processing machine main body 50 on the display device 97 in a predetermined format. Let The operation of the display control unit 85A is controlled by the main control unit 78A.

  The input device 95 connected to the control device 90A inputs, for example, information for instructing start or stop of the control device 90A or information for designating data to be displayed on the display device 97 to the control device 90A. Specifically, it is an operation panel. The display device 97 is controlled in operation by the display control unit 85A and displays, for example, the processing conditions in the processing machine body 50, the operation status of the processing machine body 50, and the like.

  In the wire electric discharge machine 100 having the above-described configuration, when the activation of the control device 90A is instructed by the input device 95, the basic numerical control data stored in the storage unit 55A and the first data changing unit 75A are sent. Based on the received data, the control device 90A (main control unit 78A) controls the operation of the processing machine body 50 and proceeds with the electric discharge machining of the workpiece 150. Similarly to the conventional wire electric discharge machine, the working liquid is supplied from the nozzles 15a and 15b to the periphery of the wire electrode 11 guided by the pair of upper and lower nozzles 15a and 15b, and the table 5 on which the workpiece 150 is arranged is predetermined. A high-frequency pulse voltage is applied to the wire electrode 11 and the workpiece 150 while moving the workpiece 150 in the direction of, and the workpiece 150 is machined into a predetermined shape by electric discharge generated between the wire electrode 11 and the workpiece 150.

  At this time, the accurate plate thickness of the workpiece 150 on the machining path is continuously calculated by the first plate thickness calculator 60 or sequentially with a predetermined interval. Further, based on the plate thickness calculated by the first plate thickness calculator 60, the numerical control data for at least one control item selected according to the plate thickness of the workpiece 150 among the basic numerical control data is stored in the first. 1 data change part 75A changes. The change of the numerical control data by the first data changing unit 75A is performed so as to reduce the margin preset in the basic numerical control data or set it to 0 (zero), as already described.

  Therefore, according to the wire electric discharge machine 100, the machining conditions can be optimized as compared with the conventional wire electric discharge machine. As a result, for example, a workpiece having a small thickness change in the machining path, that is, a workpiece having a large number of flat surfaces, can easily improve the machining speed. Further, it is easy to improve the machining accuracy of a workpiece having many curved parts and corners in the machining path, that is, a workpiece having many curved surfaces and ridges in the machining path.

For example, as shown in FIG. 2, in the case where electric discharge machining is performed in the recess 150a formed in advance on the workpiece 150, the machining liquid is discharged when the nozzle of the machining liquid in the nozzle 15a reaches the recess 150a. Backflow occurs in the recess 150a, and the vibration of the wire electrode 11 increases sharply. Therefore, in many cases, a predetermined region in the processing path MR _1, i.e. in the region of from several mm approximately in front of the point P ₀ of the outer edge P ₁ of the recesses 150a to the outer edge P ₁ of the recesses 150a, prevents the back flux of the Therefore, the operation of the machining liquid supply device 30 (see FIG. 1) is numerically controlled so that the supply quantity of the machining liquid is reduced.

  Therefore, in the area (area in the machining path) where the basic numerical control data for the predetermined control item is intentionally changed even if the thickness of the workpiece 150 is constant, the board by the first thickness calculator 60 is used. It is preferable not to calculate the thickness. Alternatively, although the plate thickness is calculated by the first plate thickness calculation unit 60 in the above-described region, the first data changing unit 75A is not operated based on the calculation result, or the first data The arithmetic processing unit 80A is preferably configured so that the main control unit 78A ignores the change of the numerical control data by the changing unit 75A.

  Of course, a backflow location extraction unit that extracts a region where the backflow of the machining fluid is likely to occur based on the three-dimensional data stored in the storage unit 55 is added to the arithmetic processing unit 80A, and the actual machining location is A data change unit is added to change the numerical control data for the amount of machining fluid so that the amount of machining fluid decreases (for example, halved) at the stage just before the area about a few millimeters before the main body of the machine according to this data change. It is also possible to configure the wire electric discharge machine 100 so that 50 operates.

Embodiment 2. FIG.
In the wire electric discharge machine of the present invention, the second plate thickness calculation unit that calculates the plate thickness of the workpiece in the machining path based on the actual electric discharge machining conditions is used in combination with the first plate thickness calculation unit described above. Can do. In this case, the control content determination step in the control method for the wire electric discharge machine of the present invention includes a first sub-step and a second sub-step described later.

  FIG. 3 is a configuration diagram schematically showing an example of a wire electric discharge machine in which a first plate thickness calculation unit and a second plate thickness calculation unit are used in combination. The wire electric discharge machine 105 shown in the figure includes a control device 90B, and the control device 90B includes a storage unit 55A, an arithmetic processing unit 80B, and a display control unit 85A. The arithmetic processing unit 80B includes a first plate thickness calculating unit 60, a second plate thickness calculating unit 62, a plate thickness determining unit 64, a first data changing unit 75B, and a main control unit 78B. 3 that are the same as those shown in FIG. 1 are assigned the same reference numerals as those used in FIG. 1, and descriptions thereof are omitted.

  The first plate thickness calculation unit 60, like the wire electric discharge machine 100 described in the first embodiment, continuously along the machining path or at a predetermined interval. A plate thickness of 150 is calculated. The second plate thickness calculation unit 62 operates in accordance with an instruction from the plate thickness determination unit 64 described below, and determines the plate thickness of the workpiece 150 in the machining path based on the actual electric discharge machining conditions. calculate. Specifically, the plate thickness of the workpiece 150 in the machining path is determined from the energy of the high-frequency pulse voltage actually applied to the wire electrode 11 and the workpiece 150, the machining speed, and the like, as in the prior art. calculate. The energy of the high-frequency pulse voltage actually applied to the wire electrode 11 and the workpiece 150 is calculated by the arithmetic processing unit 80B based on the detection value by the voltage detection device 40, and the processing speed is determined by the table driving device 25. The calculation processing unit 80B calculates the movement amount of the table 5.

  The plate thickness determination unit 64 takes the difference between the latest plate thickness by the first plate thickness calculation unit 60 and the previous plate thickness every time the first plate thickness calculation unit 60 calculates the plate thickness, When this difference is less than or equal to the first condition value, the latest plate thickness is selected by the first plate thickness calculation unit 60, and when the difference is greater than the first condition value, the second plate thickness calculation unit 62 receives the plate thickness. Is calculated. When the difference between the latest plate thickness calculated by the first plate thickness calculator 60 and the plate thickness calculated by the second plate thickness calculator 62 is less than the second condition value, the first plate thickness calculator 60 When the latest plate thickness is selected and the difference between the latest plate thickness calculated by the first plate thickness calculation unit 60 and the plate thickness calculated by the second plate thickness calculation unit 62 is equal to or greater than the second condition value, the second plate The thickness calculated by the thickness calculator 62 is selected.

  The first condition value and the second condition value used at this time are the width of the allowable error range in the three-dimensional data stored in the storage unit 55A and the alignment of the workpiece 150 on the table 5, respectively. It is appropriately selected by the user according to the width of the allowable range of accuracy, etc., and stored in the storage unit 55A in advance. In many cases, the first condition value and the second condition value are appropriately selected within a range larger than 0 (zero) and not exceeding several millimeters. The selection of the plate thickness in the plate thickness determination unit 64 corresponds to the first sub-step in the control content determination step in the control method of the wire electric discharge machine of the present invention.

  The first data changing unit 75B is a numerical control data for at least one control item selected according to the plate thickness of the workpiece 150 among the basic numerical control data stored in the storage unit 55A, for example, a wire electrode 11 and numerical control data regarding the length of the pulse rest period at the high-frequency pulse voltage applied to the workpiece 150 and the amount of the machining liquid ejected from the nozzles 15a and 15b, the plate thickness selected by the plate thickness determining unit 64. Change to the base. Specifically, the numerical control data is changed so that the margin set in advance in the basic numerical control data for the above control items is reduced or 0 (zero). The change of the numerical control data by the first data changing unit 74B corresponds to the second sub-step in the control content determining step in the control method of the wire electric discharge machine of the present invention.

  The main control unit 78B determines the control content of the processing machine body 50 using the basic numerical control data stored in the storage unit 55A and the numerical control data changed by the first data changing unit 75B, and the processing machine body 50 operations are controlled. When the numerical control data for the control item selected according to the plate thickness of the workpiece 150 is different between the basic numerical control data and the numerical control data after the change by the first data changing unit 75B, the main control unit 78B The operation of the processing machine body 50 is controlled with priority given to the numerical control data sent from the first data changing unit 75B.

  In the wire electric discharge machine 105 configured as described above, since the wire electric discharge machine 105 includes the above-described plate thickness determination unit 64, the plate thickness calculated by the first plate thickness calculation unit 60 is large. Even if there is an error, the error can be supplemented by the second thickness calculator 62. For this reason, for example, even when there is a certain degree of error in the shape and dimensions of the workpiece 150 based on the three-dimensional data stored in the storage unit 55A and the actual shape and dimensions of the workpiece 150, Alternatively, even when the alignment accuracy of the workpiece 150 on the table 5 is insufficient to some extent, the machining conditions can be optimized as compared with the conventional wire electric discharge machine. Further, as a result of lower accuracy required for the three-dimensional data and alignment accuracy required for the workpiece 150 on the table 5 than in the wire electric discharge machine 100 (see FIG. 1), in the wire electric discharge machine 100. It becomes easier to improve productivity than.

Embodiment 3 FIG.
The wire electric discharge machine of the present invention can be configured such that the first data changing unit functions at least when electric discharge machining is performed on a non-linear region in the machining path. When the first data changing unit is configured to function only when the non-linear region in the machining path is subjected to electric discharge machining, a non-linear region extracting unit is added to the control device.

  FIG. 4 is a configuration diagram schematically illustrating an example of a wire electric discharge machine in which a non-linear region extraction unit is added to the control device. The wire electric discharge machine 110 shown in the figure includes a control device 90C, and the control device 90C includes a storage unit 55A, an arithmetic processing unit 80C, and a display control unit 85A. The arithmetic processing unit 80C includes a first plate thickness calculation unit 60, a non-linear region extraction unit 66, a first data change unit 75A, and a main control unit 78C. 4 that are the same as those shown in FIG. 1 are assigned the same reference numerals as those used in FIG. 1, and descriptions thereof are omitted.

  The non-linear region extraction unit 66 specifies a machining path in the workpiece 150 based on the basic numerical control data and the three-dimensional data stored in the storage unit 55, and further determines the non-linear region from the machining path. That is, corners and corners are extracted. Specifically, the extraction of the non-linear region is performed by extracting the position coordinates of the non-linear region.

  The first plate thickness calculator 60 functions only when the actual electrical discharge machining location is within the non-linear region. The arithmetic processing unit 80C sends, for example, data related to the position of the non-linear region extracted by the non-linear region extraction unit 66 from the non-linear region extraction unit 66 to the main control unit 78C, and is stored in the data and the storage unit 55. Based on the basic numerical control data, the main controller 78C is configured to determine the operation timing of the first plate thickness calculator 60 and control its operation. The calculation of the plate thickness by the first plate thickness calculation unit 60 is performed continuously in the non-linear region as in the wire electric discharge machine 100 (see FIG. 1) described in the first embodiment. Alternatively, it may be performed at predetermined intervals, for example, every unit length (unit length on the machining path), every unit time, or every module in the numerical control data.

  75 A of 1st data change parts are the numerical control data about the at least 1 control item selected according to the plate | board thickness of the to-be-processed object 150 among the basic numerical control data stored in the memory | storage part 55, specifically, Represents the length of the pulse pause period at the high-frequency pulse voltage applied to the wire electrode 11 and the workpiece 150, the average voltage at the above-mentioned high-frequency pulse voltage, or numerical control data about the processing speed, The thickness is changed based on the plate thickness calculated by the calculation unit 60. As in the wire electric discharge machine 100 (see FIG. 1) described in the first embodiment, changing the numerical control data by the first data changing unit 75A reduces the margin set in advance in the basic numerical control data. Or 0 (zero).

  In the non-linear region, the main control unit 78C operates the processing machine body 50 based on the basic numerical control data stored in the storage unit 55A and the numerical control data changed by the first data changing unit 75A. To control. When the numerical control data for the control item selected according to the plate thickness of the workpiece 150 is different between the basic numerical control data and the numerical control data by the first data changing unit 75A, the main control unit 78A The operation of the processing machine body 50 is controlled with priority given to the numerical control data sent from the data changing unit 75A.

  For the straight line region in the machining path, for example, the second plate thickness calculation unit 62 (see FIG. 3) described in the second embodiment is added to the arithmetic processing unit 80C, and is calculated by the second plate thickness calculation unit 62. The main control unit 78C can be configured to control the operation of the processing machine main body 50 using the plate thickness and the basic numerical control data stored in the storage unit 55A. Alternatively, the plate thickness of the workpiece 150 is calculated by the first plate thickness calculation unit 60 in the same manner as in the non-linear region, and the basic numerical value control data stored in the storage unit 55A and the first plate thickness calculation unit 60 are calculated. The main control unit 78C can also be configured to control the operation of the processing machine main body 50 using the plate thickness calculated in step 1 and the numerical control data changed by the first data changing unit 75A.

  In the wire electric discharge machine 110 having such a configuration, the first data changing unit 75A functions when the non-linear region in the machining path is subjected to electric discharge machining, so that the machining conditions in the non-linear region are optimized. It becomes easy to increase the processing accuracy in the non-linear region without excessively reducing the processing speed in the non-linear region.

Embodiment 4 FIG.
In the wire electric discharge machine of the present invention, the numerical control data on the length of the pulse pause period at the high frequency pulse voltage is changed according to whether each of the pair of nozzles and the workpiece are in close contact with each other. A second data changing unit can be further added to the control device. The storage unit constituting the control device further stores coordinate data for specifying the position of the end surface on the workpiece side of each nozzle, and the arithmetic processing unit is based on the three-dimensional data stored in the storage unit. A nozzle state determination unit for determining whether or not each nozzle is in contact with the workpiece is further added. In this case, the control content determination step in the control method of the wire electric discharge machine of the present invention includes third to fifth sub-steps described later.

  FIG. 5 is a configuration diagram schematically illustrating an example of a wire electric discharge machine in which a second data changing unit is added to the control device. The wire electric discharge machine 115 shown in the figure includes a control device 90D, and the control device 90D includes a storage unit 55D, an arithmetic processing unit 80D, and a display control unit 85A. The arithmetic processing unit 80D includes a first plate thickness calculation unit 60, a nozzle state determination unit 68, a second data change unit 70, a first data change unit 75A, and a main control unit 78D. 5 that are the same as those shown in FIG. 1 are assigned the same reference numerals as those used in FIG. 1, and descriptions thereof are omitted.

  The storage unit 55D includes basic numerical control data for processing the workpiece, three-dimensional data of the workpiece 150, and coordinates for specifying the position of the end surface on the workpiece 150 side in each of the nozzles 15a and 15b. Data is stored.

  The nozzle state determination unit 68 included in the arithmetic processing unit 80D determines whether each of the nozzles 15a and 15b in the processing path and the workpiece 150 are in close contact with each other based on the above three-dimensional data and the above coordinate data. Judgment based on. In addition, that the nozzle and the workpiece are in close contact refers to, for example, that the gap between the nozzle 15a or the nozzle 15b and the workpiece 150 is 0.5 mm or less. Since the positions of the nozzles 15a and 15b do not change in the process of electric discharge machining the workpiece 150, the nozzles 15a and 15b and the workpiece 150 are connected to each other based on the above three-dimensional data and the above coordinate data. It can be determined whether or not the contact state. The above determination in the nozzle state determination unit 68 corresponds to the third sub-step in the control content determination step in the control method of the wire electric discharge machine of the present invention.

  The second data changing unit 70 is the numerical control data after the length of the pulse pause period at the high frequency pulse voltage applied to the wire electrode 11 and the workpiece 150 is changed by the first data changing unit 75A. Based on the determination result in the nozzle state determination part 68, it changes so that the bending in the wire electrode 11 may reduce. The above change in the first data changing unit 75A corresponds to the fourth sub-step in the control content determining step in the control method of the wire electric discharge machine of the present invention, and the above change in the second data changing unit 70 is This corresponds to the fifth sub-step in the control content determination step in the control method of the wire electric discharge machine of the present invention.

  As shown in FIG. 6, the bending of the wire electrode 11 in the machining path is such that each of the nozzles 15 a and 15 b is in close contact with the workpiece 150 as long as the length of the pulse pause period at the high frequency pulse voltage is the same. In some cases, when only one of the nozzles 15a, 15b is in close contact with the workpiece 150, both nozzles 15a, 15b increase in the order in which they are not in close contact with the workpiece 150. As already described, when the length of the pulse pause period with the high-frequency pulse voltage is increased, the processing reaction force is reduced, and as a result, the deflection of the wire electrode is also reduced. Basic numerical control data is generally created on the assumption that a pair of upper and lower nozzles 15 a and 15 b are in close contact with the workpiece 150.

  Therefore, the second data changing unit 70 is predetermined based on the determination result of the nozzle state determining unit 68 for the numerical control data regarding the length of the pulse pause period after being changed by the first data changing unit 75A. The pulse pause period is extended when only one of the nozzles 15a and 15b is in close contact with the workpiece 150. When both of the nozzles 15a and 15b are not in contact with the workpiece 150, the pulse pause is performed. The numerical control data is changed so that the period is further extended. When both the nozzles 15a and 15b are in contact with the workpiece 150, the data can be changed by the second data changing unit 70 in accordance with the data change contents in the first data changing unit 75A. It can be omitted.

  The content of the above calculation by the second data changing unit 70 depends on the material and wire diameter of the wire electrode 11 used in the wire electric discharge machine 115, the type of machining fluid, and the material of the workpiece 150. According to the above, it is obtained in advance by experiments.

  The main control unit 78D includes the basic numerical control data stored in the storage unit 55D, the numerical control data after being changed by the first data changing unit 75A, and the pulse after being changed by the second data changing unit 70. The control content of the processing machine body 50 is determined using the numerical control data regarding the length of the suspension period, and the operation of the processing machine body 50 is controlled. When the numerical control data for the control item selected according to the plate thickness of the workpiece 150 is different between the basic numerical control data and the numerical control data by the first data changing unit 75A, the main control unit 78A The operation of the processing machine body 50 is controlled with priority given to the numerical control data sent from the data changing unit 75A. Regarding the numerical control data regarding the length of the pause period of the high-frequency pulse voltage, the numerical control data that has been changed by the second data changing unit 70 has the highest priority.

  In the wire electric discharge machine 115 having such a configuration, the first data changing unit 75A and the second data changing unit 70 function, so that the machining conditions can be further optimized particularly in the non-linear region in the machining path. As a result, it becomes easier to increase the processing accuracy in the non-linear region without excessively reducing the processing speed.

Embodiment 5 FIG.
In the wire electric discharge machine of the present invention, the machining path and the numerical control data for at least one control item selected according to the plate thickness of the workpiece among the control contents determined by the arithmetic processing unit. A function of displaying on the display device can be added.

  FIG. 7 is a configuration diagram schematically showing an example of a wire electric discharge machine to which the above functions are added. The wire electric discharge machine 120 shown in the figure includes a control device 90E, and the control device 90E includes a storage unit 55A, an arithmetic processing unit 80C, and a display control unit 85E. The arithmetic processing unit 80C includes a first plate thickness calculation unit 60, a non-linear region extraction unit 66, a first data change unit 75A, and a main control unit 78C. 7 that are the same as those shown in FIG. 4 are assigned the same reference numerals as those used in FIG. 4 and descriptions thereof are omitted.

  The first plate thickness calculation unit 60, the non-linear region extraction unit 66, and the first data change unit 75A have the same functions as those in the wire electric discharge machine 110 (see FIG. 4) described in the third embodiment. However, the operation timing is different from that in the wire electric discharge machine 110 (see FIG. 4), and before the workpiece 150 is wire electric discharge processed. Then, the results of specifying the machining path by the first plate thickness calculating unit 60, extracting the non-linear region by the non-linear region extracting unit 66, and changing the numerical control data by the first data changing unit 75A are stored in the storage unit 55A. These results are read by the display control unit 85E and displayed on the display device 97 together with the machining path. The operation of the display control unit 85E is controlled by the main control unit 78C.

FIG. 8 is a schematic diagram of an example of an image displayed on the display device 97 under the control of the display control unit 85E. In the image shown in the figure, the machining path MR ₁₀ specified by the first plate thickness calculator 60, the non-linear region extracted by the non-linear region extractor 66, and the first data changing unit 75A have changed. The later numerical control data is shown. In this image, the non-linear region extracted by the non-linear region extracting unit 66 and its periphery are surrounded by a solid line circle. Further, the numerical value displayed in the vicinity of each circle is changed in numerical control data in the non-linear region after being changed by the first data changing unit 75A, for example, the numerical value control after changing the length of the pulse pause period. Data are shown. The processing path MR ₁₀ While the illustrated are of two dimensions, it is also possible to three-dimensional processing path constitutes a display control unit 85E to be displayed on the display device 97.

  As in the wire electric discharge machine 110 (see FIG. 4), the main control unit 78C shown in FIG. 7 has the basic numerical control data stored in the storage unit 55A and the first numerical control data at least in the non-linear region. The control content of the processing machine body 50 is determined using the numerical control data changed by the 1 data changing unit 75A, and the operation of the processing machine body 50 is controlled.

In the wire electric discharge machine 120 configured as described above, the machining path MR ₁₀ and part of the control content determined by the arithmetic processing unit 80C are displayed on the display device 95 before the start of the electric discharge machining. Convenience when the user confirms is improved.

Embodiment 6 FIG.
In the wire electric discharge machine of the present invention, a data rewriting unit that rewrites data stored in the storage unit based on an instruction input from the input means can be further added to the control device. In this case, the input means is connected to the control device by wire or wireless. When this data rewriting unit is used in combination with the display control unit described in the fifth embodiment, high convenience can be obtained.

  FIG. 9 is a configuration diagram schematically showing an example of a wire electric discharge machine to which the data rewriting unit is added. The wire electric discharge machine 125 shown in the figure includes a control device 90F, and the control device 90F includes a storage unit 55A, an arithmetic processing unit 80F, a display control unit 85E, and a data rewriting unit 88. The arithmetic processing unit 80F includes a first plate thickness calculation unit 60, a non-linear region extraction unit 66, a first data change unit 75A, and a main control unit 78F. An input unit 95 and a display device 97 are connected to the control device 90F. 9 that are the same as those shown in FIG. 7 are assigned the same reference numerals as those used in FIG. 7, and descriptions thereof are omitted.

  Since the wire electric discharge machine 125 has the display control unit 85E, the machining path and the control determined by the main control unit 78F are the same as in the wire electric discharge machine 120 described in the fifth embodiment. The numerical value control data for at least one control item selected according to the plate thickness of the workpiece 150 among the contents can be displayed on the display device 97. Since the data rewriting unit 88 is provided, the data stored in the storage unit 55A can be rewritten based on an instruction input from the input unit 95. Therefore, the numerical control data displayed on the display device 97 by the display control unit 85E is changed by the input unit 95, and the numerical control data changed by the input unit 95 is reflected as the change contents by the first data changing unit 75A. Can do.

  At this time, the input means 95 is connected to the control device 90F by wire or wireless. When the input unit 95 is connected to the control device 90F by radio, a transmission / reception unit and a communication processing unit are further attached to the control device 90F. At this time, as the input means 95, input means other than the operation panel, for example, a communication terminal or a personal computer is used. In order to improve convenience when inputting an instruction by the input means 95, when data is rewritten by the data rewriting unit 88, at least the original data to be rewritten and the data after rewriting are displayed on the display device 97. It is preferable to configure the display control unit 85E so that the images are displayed sequentially or simultaneously.

  FIG. 10 is a schematic diagram of an example of an image after the numerical control data in the image displayed on the display device 97 under the control of the display control unit 85E is rewritten by an instruction from the input means 95. The image shown in FIG. 8 is obtained by rewriting a part of the numerical control data in the image shown in FIG. 8 according to an instruction from the input unit 95, and the numerical value with an underline of the wavy line is the input unit 95. The numerical control data after being rewritten by an instruction from, for example, the numerical control data after changing the length of the pulse pause period is shown.

The main control unit 78F shown in FIG. 9 is stored in the storage unit 55A in at least a non-linear region in the machining path MR ₁₀ (see FIG. 10), as in the wire electric discharge machine 120 (see FIG. 7). The processing machine main body 50 using the basic numerical control data that has been changed and the numerical control data that has been changed by the first data changing unit 75A (the numerical control data that reflects the change when changed by the input means 95). And control the operation of the processing machine main body 50.

  When electric discharge machining is performed on the workpiece 150 (see FIG. 9), a non-linear region where high machining accuracy is not required may be included in the machining path. In the wire electric discharge machine 125 having the above-described configuration, the user can change the machining accuracy in the non-linear region on the screen of the display device 97 according to the machining circumstances, so the user confirms the machining conditions. In addition to convenience at the time, convenience when the user sets processing conditions is improved.

  In addition, when displaying the numerical control data about the length of the pulse pause period at the high frequency pulse voltage on the display device 97, a function for estimating the machining time is added to the arithmetic processing unit 80F, and the estimated time by the function is calculated. It is preferable to add a function to be displayed on the display device 97. When these functions are added, the estimated time is a guideline when the user changes the numerical control data by the input means 95, so that the numerical control data can be easily changed.

Embodiment 7 FIG.
In the wire electric discharge machine of the present invention, the controller is configured to control the operation of the machine body using numerical control data with a small margin on the assumption that the plate thickness of the workpiece is accurately calculated. You can also

  FIG. 11 is a block diagram schematically showing an example of a wire electric discharge machine configured such that the control device controls the operation of the machine main body using numerical control data with a reduced margin. The wire electric discharge machine 130 shown in the figure includes a control device 90G, and the control device 90G includes a storage unit 55G, an arithmetic processing unit 80G, and a display control unit 85A. The arithmetic processing unit 80G includes a first plate thickness calculation unit 60 and a main control unit 78G. 11 that are the same as those shown in FIG. 1 are assigned the same reference numerals as those used in FIG. 1 and description thereof is omitted.

  The storage unit 55G constituting the control device 90G stores numerical control data used for operation control of the processing machine body 50 and three-dimensional data of the workpiece 150, and the numerical control data described above. Is set to have a smaller margin than in the conventional basic numerical control data on the assumption that the thickness of the workpiece 150 is accurately calculated.

  The main control unit 78G determines the control content of the processing machine body 50 using the numerical control data with a small margin stored in the storage unit 55G and the plate thickness calculated by the first plate thickness calculation unit 60, The operation of the processing machine body 50 is controlled.

  Also with the wire electric discharge machine 130 configured as described above, the machining conditions can be optimized as compared with the conventional wire electric discharge machine like the wire electric discharge machine 100 shown in FIG. As a result, for example, a workpiece having a small thickness change in the machining path, that is, a workpiece having a large number of flat surfaces, can easily improve the machining speed. Further, it is easy to improve the machining accuracy of a workpiece having many curved parts and corners in the machining path, that is, a workpiece having many curved surfaces and ridges in the machining path.

It is a lineblock diagram showing roughly an example of a wire electric discharge machine of this invention. It is a perspective view which shows roughly the example which discharge-processes the inside of the recessed part currently formed in the to-be-processed object. It is a block diagram which shows roughly an example of the wire electric discharge machine with which the 1st board thickness calculation part and the 2nd board thickness calculation part were used together among the wire electric discharge machines of this invention. It is a block diagram which shows roughly an example of the wire electrical discharge machine by which the nonlinear area | region extraction part was added to the control apparatus among the wire electrical discharge machines of this invention. It is a block diagram which shows roughly an example of the wire electric discharge machine by which the 2nd data change part was added to the control apparatus among the wire electric discharge machines of this invention. It is the schematic which shows that the bending condition of a wire electrode changes according to the presence or absence of a contact with each of a pair of nozzle which comprises the wire electric discharge machine, and a to-be-processed object. Of the wire electric discharge machine according to the present invention, a wire electric discharge having a function of causing a display device to display a machining path and numerical control data for at least one control item selected according to the thickness of the workpiece. It is a block diagram which shows an example of a processing machine roughly. It is the schematic of an example of the image displayed on the display apparatus in the wire electric discharge machine shown in FIG. The block diagram which shows schematically an example of the wire electric discharge machine to which the data rewriting part which rewrites the data stored in the memory | storage part based on the instruction input from an input means was added among the wire electric discharge machines of this invention It is. It is the schematic of an example of the image displayed on the display apparatus in the wire electric discharge machine shown in FIG. In the wire electric discharge machine of this invention, it is the block diagram which shows roughly an example of the wire electric discharge machine comprised so that a control apparatus might control operation | movement of a processing machine main body using the numerical control data which made the margin small. is there.

Explanation of symbols

5 Table 11 Wire electrodes 15a, 15b Nozzle 50 Processing machine main bodies 55A, 55D, 55G Storage unit 60 First plate thickness calculation unit 62 Second plate thickness calculation unit 64 Plate thickness determination unit 66 Non-linear region extraction unit 68 Nozzle state determination unit 70 Second data changing unit 75A, 75B First data changing unit 80A, 80B, 80C, 80D, 80F, 80G Arithmetic processing unit 85A, 85E Display control unit 88 Data rewriting unit 90A, 90B, 90C, 90D, 90E, 90F, 90G Control device 95 Input means 97 Display device 100, 105, 110, 115, 120, 125, 130 Wire electric discharge machine 150 Workpiece

Claims (10)

A processing machine body that processes the workpiece into a predetermined shape by a discharge generated by applying a high-frequency pulse voltage while relatively moving the wire electrode guided by the pair of upper and lower nozzles and the workpiece; A wire electric discharge machine equipped with a control device for controlling the operation of the machine body,
The controller is
A storage unit storing numerical control data for numerically controlling the processing machine main body and three-dimensional data of the workpiece;
A first plate thickness calculator that calculates a plate thickness at a machining path in the workpiece based on the numerical control data and the three-dimensional data;
A main control unit that determines the control content of the processing machine body using the numerical control data and the plate thickness calculated by the first plate thickness calculation unit;
A wire electric discharge machine characterized by including. The numerical control data is basic numerical control data serving as a basis when numerically controlling the processing machine body,
The control device is configured to calculate numerical control data for at least one control item selected from the basic numerical control data according to the thickness of the workpiece by the first thickness calculator. A first data changing unit for changing based on the thickness;
The main control unit defines the control content using the basic numerical control data and the numerical control data after being changed by the first data changing unit.
The wire electric discharge machine according to claim 1. The first plate thickness calculation unit calculates the plate thickness in the machining path in the workpiece continuously or at a predetermined interval,
The controller is
A second plate thickness calculator that calculates the plate thickness of the workpiece in the machining path based on actual electric discharge machining conditions;
Every time the first plate thickness calculation unit calculates the plate thickness, the difference between the latest plate thickness by the first plate thickness calculation unit and the previous plate thickness is calculated, and the difference is equal to or less than the first condition value. Sometimes the latest plate thickness is selected, and when the difference is greater than the first condition value, the second plate thickness calculation unit calculates the plate thickness, and the second plate thickness calculation unit calculates the plate thickness When the difference from the latest plate thickness is less than the second condition value, the latest plate thickness is selected, and the difference between the plate thickness calculated by the second plate thickness calculation unit and the latest plate thickness is the first thickness. A plate thickness determining unit that selects the plate thickness calculated by the second plate thickness calculating unit when the condition value is equal to or greater than 2;
Further including
The first data changing unit has selected the numerical control data for at least one control item selected according to the thickness of the workpiece among the basic numerical control data by the thickness determining unit. Change based on plate thickness,
The wire electric discharge machine according to claim 2. The control device further includes a non-linear region extraction unit that extracts a non-linear region from the machining path based on the basic numerical control data,
4. The wire electric discharge machine according to claim 2, wherein the first data changing unit functions when the electric discharge machining portion is at least in the non-linear region extracted by the non-linear region extracting unit. 5. . The storage unit further stores coordinate data for specifying the position of the end surface on the workpiece side in each of the nozzles,
The controller is
A nozzle state determination unit that determines whether or not each of the nozzles and the workpiece is in close contact based on the three-dimensional data and the coordinate data;
Based on the numerical control data after being changed by the first data changing unit and the determination result by the nozzle state determining unit, the numerical control data regarding the length of the pulse pause period at the high-frequency pulse voltage is changed. A second data changing unit;
Further including
The main control unit has the basic numerical control data, the numerical control data after being changed by the first data changing unit, and the length of the pulse pause period after being changed by the second data changing unit. The control content is determined using numerical control data.
The wire electric discharge machine according to any one of claims 2 to 4, wherein the wire electric discharge machine is provided. A display device connected to the control device;
The control device displays the processing path and numerical control data for at least one control item selected according to the thickness of the workpiece among the control contents determined by the arithmetic processing unit. Further including a display control unit to be displayed on the device,
The wire electric discharge machine according to claim 1, wherein the wire electric discharge machine is provided. It further comprises input means connected to the control device by wire or wirelessly,
The control device further includes a data rewriting unit that rewrites data stored in the storage unit based on an instruction input from the input unit.
The wire electric discharge machine according to claim 1, wherein the wire electric discharge machine is provided. A processing machine body that processes the workpiece into a predetermined shape by a discharge generated by applying a high-frequency pulse voltage while relatively moving the wire electrode guided by the pair of upper and lower nozzles and the workpiece; A control method of a wire electric discharge machine equipped with a control device for controlling the operation of the machine body,
A plate thickness calculating step for calculating a plate thickness in a processing path in the workpiece based on numerical control data for numerically controlling the processing machine main body and three-dimensional data of the workpiece;
A control content determination step for determining the control content of the processing machine body using the numerical control data and the plate thickness calculated in the plate thickness calculation step;
The control method of the wire electric discharge machine characterized by including. In the plate thickness calculating step, the plate thickness in the processing path in the workpiece is calculated continuously or at a predetermined interval,
The control content determination step includes
Every time the plate thickness is calculated in the plate thickness calculating step, the difference between the latest plate thickness in the plate thickness calculating step and the previous plate thickness is taken, and when the difference is less than or equal to the first condition value, the latest When the difference is larger than the first condition value, the thickness of the workpiece in the machining path is calculated based on the actual electric discharge machining condition, and the actual electric discharge machining condition is calculated. When the difference between the plate thickness calculated based on the above and the latest plate thickness is less than the second condition value, the latest plate thickness is selected, and the plate thickness calculated based on the actual electric discharge machining conditions and the latest plate thickness are selected. A first sub-step of selecting a plate thickness calculated by the second plate thickness calculator when the difference from the plate thickness is equal to or greater than the second condition value;
As the numerical control data, basic numerical control data serving as a basis for numerically controlling the processing machine main body is used, and at least one control selected according to the thickness of the workpiece among the basic numerical control data A second sub-step of changing numerical control data for the item based on the plate thickness selected in the first sub-step,
The control method of the wire electric discharge machine of Claim 8 characterized by the above-mentioned. The control content determination step includes
A third sub-step for determining whether or not each of the nozzles and the workpiece are in close contact based on the coordinate data specifying the position of the end surface on the workpiece side of each of the nozzles and the three-dimensional data. When,
Based on the plate thickness calculated in the plate thickness calculation step or the plate thickness selected in the first sub-step, at least one selected from the basic numerical control data according to the plate thickness of the workpiece. A fourth sub-step for changing numerical control data for one control item;
A fifth sub-step for changing the numerical control data regarding the length of the pulse pause period at the high-frequency pulse voltage based on the numerical control data changed in the fourth sub-step and the determination result in the third step; ,
And in the control content determination step, the basic numerical control data, the numerical control data after the change in the fourth sub-step, and the length of the pulse pause period after the change in the fifth sub-step The control content is determined using numerical control data for
The control method of the wire electric discharge machine of Claim 8 or 9 characterized by the above-mentioned.

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