JPWO2019202659A1 - Electric discharge machine and jump operation control method - Google Patents

Abstract

A material information input section (2) for receiving information on electrode materials and workpiece materials, a machining condition input section (3) for receiving machining conditions for electrical discharge machining, and a discharge pulse generated during electrical discharge machining. Of the discharge pulse detecting section (8), the discharge pulse number integrating section (9) for integrating the number of discharge pulses to calculate the integrated value of the discharge pulse per unit time, and the electrode (131) included in the processing conditions. A jump operation control unit (7) for controlling the jump operation based on the jump condition of the jump operation, and an appropriate number of discharge pulses per unit time during electric discharge machining determined from a combination of an electrode material and a workpiece material. A storage unit (4) in which a value is stored, a comparison unit (5) for comparing an appropriate value and an integrated value, and a jump parameter adjustment for adjusting a jump condition based on the comparison result of the appropriate value and the integrated value. Part (6) and For example, jump operation control unit (7) controls a jump operation in what is adjusted by a jump parameter adjuster (6).

Description

  The present invention relates to an electric discharge machine that performs electric discharge machining and a jump operation control method.

  In an electric discharge machine that performs die-sinking electric discharge machining, if the number of electric discharge pulses per unit time deviates from an optimum range, that is, an appropriate value, the machining speed decreases, and efficient electric discharge machining cannot be performed. The electric discharge machine needs to keep the number of electric discharge pulses at an appropriate value in order to perform electric discharge machining efficiently. The number of discharge pulses is influenced by the concentration of machining chips accumulated in the machining gap between the electrode and the workpiece, in which the machining liquid is interposed. When the concentration of machining waste is excessive, the electric discharge machine needs to remove the machining waste in order to keep the number of discharge pulses at an appropriate value.

  One of the methods for removing machining scraps in an electric discharge machine is a method of vertically moving an electrode, so-called jump operation. The electric discharge machining device can efficiently remove the machining waste by increasing the pulling distance of the electrode in the jump operation (hereinafter referred to as the jump distance). However, since the electric discharge machining device suspends machining during the pulling up of the electrode, the machining efficiency is reduced when the jump distance is increased. Further, the electric discharge machining apparatus is in a state where the electrode is in a lowered state after the electrode is lowered until the electrode is pulled up, that is, a period in which machining is performed between a jump operation and a next jump operation (hereinafter referred to as a jump down time. ) Is shortened, the processing amount in one jump down time is reduced, and the generation amount of processing chips can be reduced. However, in the electric discharge machining apparatus, since the time for interrupting machining increases by shortening the jump-down time, the machining efficiency also decreases in this case.

  In the electric discharge machining apparatus, the ease of removing machining chips varies depending on the shape and size of the electrode, the depth of machining on the workpiece, and the like. Therefore, in order to perform efficient machining, the electric discharge machining apparatus needs to monitor the machining state and control the jump operation according to the machining state. Patent Document 1 discloses a technique in which an electric discharge machine controls a jump operation based on the result of comparing the number of electric discharge pulses during the previous machining and the number of electric discharge pulses during the present machining.

JP 2000-153409 A

  Further, in the electric discharge machining apparatus, when machining is performed in a state in which the concentration of machining waste is too small, it becomes difficult to generate an electric discharge pulse, so that the machining speed is reduced and efficient machining cannot be performed. That is, in the electric discharge machine, in order to keep the number of electric discharge pulses at an appropriate value and perform efficient and highly accurate machining, it is important to keep the concentration of machining waste in the machining gap at an appropriate value that is neither too small nor too large. .

  However, like the electric discharge machining apparatus described in Patent Document 1, it is difficult to keep the number of electric discharge pulses at an appropriate value only by comparing the number of electric discharge pulses during the previous machining and the number of electric discharge pulses during the present machining. , There was a problem.

  The present invention has been made in view of the above, and an object of the present invention is to obtain an electric discharge machining apparatus that can realize efficient electric discharge machining.

  In order to solve the above-mentioned problems and to achieve the object, an electric discharge machining apparatus of the present invention provides information on an electrode material that is a material of an electrode used in electric discharge machining, and a workpiece that is a material of a workpiece to be electric discharge machined. A material information input section that receives the information of the workpiece material, a machining condition input section that receives the input of the machining conditions of the electric discharge machining, a discharge pulse detection section that detects the discharge pulse generated during the electric discharge machining, and a discharge pulse And a discharge pulse number integration unit that integrates the numbers and calculates an integrated value of discharge pulses per unit time. Further, the electric discharge machining apparatus is an electric discharge machine determined from a combination of a jump motion control unit that controls the jump motion and an electrode material and a workpiece material based on the jump condition of the electrode jump motion included in the machining conditions. The storage unit that stores the appropriate value of the number of discharge pulses per unit time, the comparison unit that compares the appropriate value and the integrated value, and the jump condition based on the comparison result of the appropriate value and the integrated value. And a jump parameter adjusting unit for adjusting. The jump operation control unit is characterized by controlling the jump operation based on the content adjusted by the jump parameter adjustment unit.

  The electrical discharge machining apparatus according to the present invention has an effect of realizing efficient electrical discharge machining.

Block diagram showing a configuration example of an electric discharge machine according to the first embodiment The figure which shows the suitable value of the number of electric discharge pulses per unit time which is stored in the storage unit of the electric discharge machining apparatus according to the first embodiment and which is determined from the combination of the electrode material and the workpiece material. In the electrical discharge machining apparatus according to the first embodiment, a flowchart showing a jump operation control method for keeping the number of electrical discharge pulses generated during electrical discharge machining at an appropriate value. FIG. 3 is a diagram showing a relationship between a level of a current machining state based on a ratio of an integrated value to an appropriate value and a magnification for a parameter of a jump condition at each level in the electric discharge machining apparatus according to the first exemplary embodiment. The figure which shows the example at the time of comprising the processing circuit with which the electrical discharge machining apparatus concerning Embodiment 1 is comprised by a processor and memory. Block diagram showing a configuration example of an electric discharge machine according to a second embodiment The figure which shows the suitable value of the number of electric discharge pulses per unit time determined from the combination of the electrode material, the workpiece material, the processing area, and the processing conditions, which is stored in the storage unit of the electric discharge machining apparatus according to the second embodiment. In the electrical discharge machining apparatus according to the second embodiment, a flowchart showing a jump operation control method for keeping the number of electrical discharge pulses generated during electrical discharge machining at an appropriate value.

  Hereinafter, an electric discharge machine and a jump operation control method according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1.
FIG. 1 is a block diagram showing a configuration example of an electric discharge machining apparatus 1 according to the first exemplary embodiment of the present invention. The electric discharge machining apparatus 1 includes a material information input unit 2, a machining condition input unit 3, a storage unit 4, a comparison unit 5, a jump parameter adjustment unit 6, a jump operation control unit 7, and a discharge pulse detection unit 8. , Discharge pulse number integration unit 9, Z-axis motor control unit 10, Z-axis motor 11, machining power supply control unit 12, machining unit 13, machining speed calculation unit 14, machining result storage unit 15, and update. And a section 16. The machining unit 13 has an electrode 131 used in electric discharge machining and a workpiece 132 to be processed by electric discharge machining.

  The material information input unit 2 receives input of information on the material of the electrode 131 and information on the material of the workpiece 132 from the user. The material information input unit 2 stores the received information about the material of the electrode 131 and the received information about the material of the workpiece 132 in the storage unit 4. In the following description, the material of the electrode 131 may be referred to as an electrode material, and the material of the workpiece 132 may be referred to as a workpiece material.

  The machining condition input unit 3 receives input of machining conditions for electric discharge machining from a user. The processing condition input unit 3 stores the received processing condition in the storage unit 4. Further, the processing condition input unit 3 outputs the received processing conditions to the processing power supply control unit 12 and the jump operation control unit 7. Machining conditions for electric discharge machining include a machining voltage which is a voltage applied to the electrode 131, a machining current which is a current flowing through the electrode 131, an application time for applying a machining voltage, a non-application time for which no machining voltage is applied, and a jump of the electrode 131. A jump condition indicating the operation condition of the operation is included.

  The storage unit 4 stores the electrode material and the workpiece material input to the material information input unit 2 and the machining conditions of the electric discharge machining input to the machining condition input unit 3. The storage unit 4 also stores an appropriate value of the number of electric discharge pulses per unit time during electric discharge machining, which is determined from the combination of the electrode material and the workpiece material. An appropriate value for the number of discharge pulses per unit time is the preset number of discharge pulses generated per unit time in order to achieve efficient electric discharge machining in the specified combination of electrode material and workpiece material. Is a number. Generally, the easiness of generating the discharge pulse may differ depending on the combination of the electrode material and the workpiece material. That is, the appropriate value of the number of discharge pulses per unit time is influenced by the combination of the electrode material and the work material. FIG. 2 is a diagram showing an appropriate value of the number of discharge pulses per unit time stored in the storage unit 4 of the electric discharge machining apparatus 1 according to the first embodiment, which is determined from the combination of the electrode material and the workpiece material. Is. The storage unit 4 stores an appropriate value according to the combination of the electrode material and the workpiece material. For example, when the electrode material is copper and the workpiece material is iron, the storage unit 4 stores N1 as an appropriate value of the number of discharge pulses per unit time. The user may set appropriate value information corresponding to the combination of the electrode material and the work material in the storage unit 4 via the material information input unit 2 or the like, or may generate the information by an external computer and display it. It may be set in the storage unit 4 via a storage medium that does not exist. The appropriate value of the number of electric discharge pulses per unit time shown in FIG. 2 is an initial value and may be updated by a process during electric discharge machining of the electric discharge machine 1 described later. The electric discharge machine 1 updates the appropriate value of the number of electric discharge pulses per unit time so that the machining efficiency is maximized during machining. In the following description, the appropriate value of the number of discharge pulses per unit time may be simply referred to as an appropriate value.

  The comparison unit 5 compares the appropriate value stored in the storage unit 4 with the integrated value of the discharge pulse per unit time calculated by the discharge pulse number integration unit 9.

  The jump parameter adjustment unit 6 adjusts the jump condition of the jump operation performed by the jump operation control unit 7 based on the comparison result of the comparison unit 5. The parameters of the jump condition include a jump distance indicating a pulling distance when the electrode 131 performs a jump operation, a jump down time indicating a period during which the electrode 131 is closest to the workpiece 132, and a jump speed that is a pulling speed of the electrode 131. is there. Specifically, the jump parameter adjusting unit 6 adjusts the jump condition by setting the magnification for each parameter such as the jump distance, the jump down time, and the jump speed based on the comparison result.

  The jump operation control unit 7 performs the jump operation of the electrode 131 based on the jump condition included in the processing condition input by the processing condition input unit 3 and the magnification of each of the jump conditions set by the jump parameter adjusting unit 6 with respect to each parameter. To control. That is, the jump operation control unit 7 controls the jump operation based on the content adjusted by the jump parameter adjustment unit 6.

  The discharge pulse detection unit 8 detects a discharge pulse generated between the electrode 131 and the workpiece 132 in the machining unit 13 during electric discharge machining.

  The discharge pulse number integration unit 9 integrates the number of discharge pulses detected by the discharge pulse detection unit 8 to calculate an integrated value of discharge pulses per unit time.

  The Z-axis motor control unit 10 controls the operation of the Z-axis motor 11 that operates a main shaft (not shown) that holds the electrode 131.

  Under the control of the Z-axis motor control unit 10, the Z-axis motor 11 moves a main shaft (not shown) holding the electrode 131 in the Z-axis direction, that is, in the vertical direction.

  The machining power supply control unit 12 supplies machining power to the electrode 131 based on the machining conditions of the electric discharge machining input in the machining condition input unit 3. As described above, the machining conditions for electric discharge machining include machining voltage, machining current, application time, non-application time, and the like.

  The machining unit 13 uses the electrode 131 to perform electric discharge machining of the workpiece 132 facing the electrode 131 and installed in a machining tank (not shown).

  The machining speed calculation unit 14 calculates the machining speed of the electric discharge machining in the machining unit 13.

  The processing result storage unit 15 stores the integrated value calculated by the discharge pulse number integration unit 9 and the processing speed calculated by the processing speed calculation unit 14. The processing result storage unit 15 stores at least the present time, that is, the latest integrated value and processing speed, and the previous integrated value and processing speed.

  The updating unit 16 updates the appropriate value stored in the storage unit 4 based on the integrated value and the processing speed stored in the processing result storage unit 15 in order to maximize the processing efficiency.

  In addition, in the electric discharge machine 1 shown in FIG. 1, the components related to the jump operation performed in the present embodiment are described. Therefore, in the electric discharge machine 1 shown in FIG. 1, the X-axis motor and the Y-axis motor that move the workpiece 132 in the horizontal direction, that is, the two-dimensional direction, the X-axis motor control unit that controls the operations of the X-axis motor, and the Y-axis. The description of the Y-axis motor control unit that controls the operation of the motor is omitted.

  Next, the control of the electric discharge machining apparatus 1 for maintaining the number of electric discharge pulses generated during electric discharge machining at an appropriate value will be described. In the present embodiment, when the integrated value of the electric discharge pulse is smaller than the appropriate value, it is expected that the electric discharge machine 1 is less likely to generate the electric discharge pulse due to the concentration of the machining waste being too small. Therefore, the jump operation is controlled so that the concentration of processing waste increases. Further, in the electric discharge machining apparatus 1, when the integrated value of the electric discharge pulse is larger than the appropriate value, it is expected that the electric discharge pulse is abnormally generated because the electric discharge pulse concentration is excessive. The jump motion is controlled so that Since there is a correlation between the number of electric discharge pulses and the concentration of machining waste, the electric discharge machining apparatus 1 can maintain the number of electric discharge pulses at an appropriate value by controlling the jump operation so as to keep the concentration of machining waste at an appropriate value. it can. FIG. 3 is a flowchart showing a jump operation control method for maintaining the number of electric discharge pulses generated during electric discharge machining at an appropriate value in the electric discharge machining apparatus 1 according to the first embodiment.

  In the electric discharge machine 1, the material information input unit 2 receives inputs of an electrode material and a workpiece material from a user (step S1). The material information input unit 2 stores the input electrode material and workpiece material in the storage unit 4.

  The machining condition input unit 3 receives an input of machining conditions for electric discharge machining based on specifications required for the workpiece 132 from the user (step S2). The processing condition input unit 3 stores the input processing condition in the storage unit 4. Further, the processing condition input unit 3 outputs the input processing conditions to the processing power supply control unit 12 and the jump operation control unit 7.

  The machining power supply controller 12 controls the electric discharge machining of the electrode 131 on the workpiece 132 according to the machining conditions. Further, the jump operation control unit 7 controls the Z-axis motor 11 via the Z-axis motor control unit 10 in accordance with the jump condition included in the processing conditions and the magnification set by the jump parameter adjustment unit 6 to jump the electrode 131. Control movements. The processing unit 13 starts processing of the workpiece 132 under the control of the processing power supply control unit 12 and the jump operation control unit 7 (step S3). At this time, the processing power supply control unit 12 sets a processing end flag MFLG, which indicates whether or not the processing is being performed, to the comparison unit 5. The processing power supply control unit 12 sets the processing end flag MFLG = 1 during processing. The machining power source control unit 12 sets the machining end flag MFLG = 0 when the machining under the final condition designated by the machining condition is completed.

  The discharge pulse detector 8 detects a discharge pulse generated between the electrode 131 and the workpiece 132 immediately after the start of machining. The discharge pulse number integration unit 9 integrates the number of discharge pulses detected by the discharge pulse detection unit 8 to calculate an integrated value of discharge pulses per unit time (step S4). The unit time is, for example, 100 milliseconds while the electrode 131 is jumping down, but is not limited to this. The discharge pulse number accumulator 9 stores the accumulated value in the machining result storage unit 15.

  The machining speed calculation unit 14 determines the position in the machining direction when the electric discharge pulse first occurs after the start of machining, and, for example, the deepest machining position in the machining direction 1 second after the first discharge pulse occurs after the start of machining. The amount of advance in the machining direction per second, that is, the machining speed of the electric discharge machining in the machining section 13 is calculated from the difference between and (step S5). The processing speed calculation unit 14 stores the calculated processing speed in the processing result storage unit 15. Note that the above 1 second is an example, and the present invention is not limited to this.

  The updating unit 16 stores the latest machining speed stored in the machining result storage unit 15, that is, the machining speed before the current jump operation, and the machining time before the previous jump operation stored in the machining result storage unit 15. The speed is compared (step S6). When the processing speed during the processing before the current jump operation is higher than the processing speed during the processing before the previous jump operation (step S6: Yes), the updating unit 16 stores the data in the storage unit 4 in order to maximize the processing efficiency. The stored appropriate value is updated with the latest value stored in the processing result storage unit 15, that is, the integrated value at the time of the processing before the current jump operation (step S7). When a new integrated value is input from the updating unit 16, the storage unit 4 updates the stored appropriate value of the number of discharge pulses with the input integrated value and stores it. The updating unit 16 omits the process of step S7 when the machining speed during machining before the current jump operation is equal to or lower than the machining speed during machining before the previous jump operation (step S6: No). The machining speed during machining before the current jump operation may be simply referred to as the current machining speed, and the machining speed during machining before the previous jump operation may be simply referred to as the previous machining speed.

  The comparison unit 5 reads the appropriate value of the number of discharge pulses from the storage unit 4 (step S8). Further, the comparison unit 5 reads the integrated value of the discharge pulse calculated from the discharge pulse number integration unit 9 (step S9). The comparison unit 5 confirms the value of the processing end flag MFLG (step S10). When the processing end flag MFLG = 0 (step S10: Yes), the comparison unit 5 determines that the processing has been completed and ends the processing. When the processing end flag MFLG ≠ 0 (step S10: No), the comparison unit 5 proceeds to the process of step S11.

  The comparison unit 5 determines whether the integrated value read from the discharge pulse number integration unit 9 is equal to the appropriate value read from the storage unit 4 (step S11). Specifically, the comparison unit 5 calculates the ratio of the integrated value to the appropriate value by the formula (1). When the calculated ratio includes a decimal, the comparison unit 5 rounds off, rounds down, or rounds up to an integer value.

  Ratio of integrated value to appropriate value = (integrated value / appropriate value) × 100 [%] (1)

  When the ratio calculated by the equation (1) is 96 to 105 [%], the comparison unit 5 determines that the integrated value is equal to the appropriate value (step S11: Yes), and the current machining state is level 5. (Step S12). Details of the level of the current processing state will be described later. Since the current machining state is level 5, the comparison unit 5 instructs the jump parameter adjustment unit 6 to maintain the current jump condition (step S13). The electric discharge machine 1 returns to the processing of step S4 and executes the above-mentioned processing. When the value calculated by the equation (1) is not 96 to 105 [%], the comparison unit 5 determines that the integrated value is not equal to the appropriate value (step S11: No), and proceeds to the process of step S14. .

  When the ratio calculated by the equation (1) is 106 [%] or more, the comparison unit 5 determines that the integrated value is larger than the appropriate value (step S14: Yes), and sets the current processing state to levels 6 to 10. Allocate to one (step S15). The comparison unit 5 instructs the jump parameter adjustment unit 6 to change the jump condition according to the process described later, because the current machining state is any of the levels 6 to 10 (step S16). The electric discharge machine 1 returns to the processing of step S4 and executes the above-mentioned processing.

  When the value calculated by the formula (1) is 95 [%] or less, the comparison unit 5 determines that the integrated value is smaller than the appropriate value (step S14: No), and sets the current machining state to levels 0 to 4. Allocate to either (step S17). Since the current machining state is any of levels 0 to 4, the comparison unit 5 instructs the jump parameter adjustment unit 6 to change the jump condition according to the process described later (step S18). The electric discharge machine 1 returns to the processing of step S4 and executes the above-mentioned processing.

  The electric discharge machine 1 repeatedly performs the processing from step S4 to step S18 for each jump operation until the electric discharge machining is completed.

  The process of adjusting the level of the current processing state and the jump condition in the jump parameter adjusting unit 6 will be described. FIG. 4 is a diagram showing the relationship between the level of the current machining state based on the ratio of the integrated value to the appropriate value and the magnification for the parameter of the jump condition at each level in the electric discharge machining apparatus 1 according to the first embodiment. . As described above, the parameters of the jump condition are the jump distance, the jump down time, the jump speed, and the like. In FIG. 4, when the integrated value of the discharge pulse is smaller than an appropriate value, that is, at levels 0 to 4, it is expected that the discharge pulse is less likely to occur due to the excessively small machining waste concentration. , The magnification for each parameter of the jump condition is set so that the concentration of the processing waste increases. Further, in FIG. 4, when the integrated value of the discharge pulse is larger than an appropriate value, that is, at levels 6 to 10, it is expected that the discharge pulse is abnormally generated due to the excessive concentration of the machining waste. Therefore, the magnification for each parameter of the jump condition is set so that the concentration of the processing waste is reduced. For example, when the electrode material is copper and the workpiece material is iron, the optimum value of the number of discharge pulses per unit time is N1 from the relationship shown in FIG. When the integrated value is Nx, the comparison unit 5 calculates the ratio of the integrated value to the appropriate value by the formula (2).

  Ratio of integrated value to appropriate value = (Nx / N1) × 100 [%] (2)

  The comparison unit 5 assigns the current machining state to any of levels 0 to 10 according to the content of FIG. 4 according to the ratio calculated using the equation (2). For example, when the ratio of the integrated value to the appropriate value is 70 [%], the comparison unit 5 assigns the current machining state to level 2. The jump parameter adjusting unit 6 sets the magnification for each parameter of the jump condition according to the contents of FIG. 4, based on the level of the current processing state distributed by the comparing unit 5. For example, when the current machining state is level 2, the jump parameter adjusting unit 6 changes the jump distance set in the jump condition to 0.7 times and is set in the jump condition according to the content of FIG. The jump down time is changed to 2.0 times, and the magnification is set to change the jump speed set in the jump condition to 0.7 times. As a result, the jump parameter adjusting unit 6 instructs the jump operation control unit 7 to perform the jump condition included in the processing condition, specifically, the jump distance L1, the jump down time T1, and the jump at the time of the next jump operation. The speed V1 is changed as in the following equations (3) to (5).

Jump distance of next jump motion = L1 × 0.7 (3)
Jump down time of next jump operation = T1 × 2.0 (4)
Jump speed of the next jump operation = V1 × 0.7 (5)

  In this way, the jump parameter adjusting unit 6 determines the magnification for adjusting each parameter of the jump condition based on the ratio of the integrated value to the appropriate value. Note that, in FIG. 4, how to divide the ratio of the integrated value to an appropriate value and each parameter, that is, the scaling factor is an example, and the present invention is not limited to this. Further, the jump parameter adjusting unit 6 may be adjusted by using at least one of the jump distance L1, the jump down time T1, and the magnification for the jump speed V1. For example, the jump parameter adjusting unit 6 shortens the jump distance in the next jump operation with respect to the current jump operation when the current machining state in which the integrated value is smaller than the appropriate value is level 0 to 4, and the jump down time. Is set and the jump speed is decreased, and the jump condition is adjusted by setting the magnification so that at least one of the two is executed. Further, the jump parameter adjusting unit 6 increases the jump distance in the next jump operation with respect to the current jump operation when the current machining state in which the integrated value is larger than the appropriate value is the level 6 to 10, the jump down time. Is set and the jump speed is increased, and the jump condition is adjusted by setting the magnification so as to execute at least one of. Note that the jump parameter adjusting unit 6 maintains the setting of the magnification for the present jump condition in the next jump operation when the current machining state in which the integrated value is equal to the appropriate value is level 5. The information shown in FIG. 4 may be held by both the comparison unit 5 and the jump parameter adjustment unit 6, or the jump parameter adjustment unit 6 may hold the information shown in FIG. 4 and the comparison unit 5 shown in FIG. Of these, only the level and the portion of the ratio of the integrated value to the appropriate value may be held.

  Next, the hardware configuration of the electric discharge machine 1 will be described. In the electric discharge machine 1, the material information input unit 2 and the machining condition input unit 3 are a keyboard, a mouse and the like used in a computer. The storage unit 4 and the processing result storage unit 15 are memories. Comparison unit 5, jump parameter adjustment unit 6, jump operation control unit 7, discharge pulse detection unit 8, discharge pulse number integration unit 9, Z-axis motor control unit 10, machining power supply control unit 12, machining speed calculation unit 14, and updating. The unit 16 is realized by a processing circuit. The processing circuit may be a processor and a memory that execute a program stored in the memory, or may be dedicated hardware.

  FIG. 5 is a diagram illustrating an example in which the processing circuit included in the electric discharge machining apparatus 1 according to the first embodiment is configured by a processor and a memory. When the processing circuit includes the processor 91 and the memory 92, each function of the processing circuit of the electric discharge machine 1 is realized by software, firmware, or a combination of software and firmware. The software or firmware is described as a program and stored in the memory 92. In the processing circuit, each function is realized by the processor 91 reading and executing the program stored in the memory 92. That is, the processing circuit includes the memory 92 for storing the program that results in the processing of each component of the electric discharge machine 1. It can also be said that these programs cause a computer to execute the procedure and method of each component of the electric discharge machine 1.

  Here, the processor 91 may be a CPU (Central Processing Unit), a processing device, an arithmetic device, a microprocessor, a microcomputer, a DSP (Digital Signal Processor), or the like. Further, the memory 92 is non-volatile or volatile, such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable ROM), and EEPROM (registered trademark) (Electrically EPROM). The semiconductor memory, magnetic disk, flexible disk, optical disk, compact disk, mini disk, DVD (Digital Versatile Disc), etc.

  When the processing circuit is configured by dedicated hardware, the processing circuit is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), or an FPGA (Field Programmable Gate). Array), or a combination thereof. Each function of each component of the electric discharge machine 1 may be realized by a processing circuit for each function, or each function may be collectively realized by a processing circuit.

  In addition, each function of each component of the electric discharge machine 1 may be partially implemented by dedicated hardware and partially implemented by software or firmware. In this way, the processing circuit can realize each of the functions described above by dedicated hardware, software, firmware, or a combination thereof.

  As described above, according to the present embodiment, the electric discharge machining apparatus 1 calculates the integrated value of electric discharge pulses per unit time during machining, and the electric discharge determined from the combination of the electrode material and the workpiece material. The appropriate value of the number of pulses and the integrated value are compared, and the jump operation of the electrode 131 is controlled based on the comparison result. When the jump operation needs to be changed, the electric discharge machine 1 adjusts the jump condition by setting a magnification for each parameter of the jump condition included in the machining condition. As a result, the electric discharge machining apparatus 1 can maintain the number of electric discharge pulses per unit time during machining at an appropriate value, and efficient and stable electric discharge machining becomes possible. Further, since the electric discharge machine 1 does not need to store the jump condition set in the previous jump operation, efficient and stable electric discharge machining can be realized with simple control.

  Note that the electric discharge machine 1 may store the first calculated value, which is obtained by performing the specified arithmetic processing for the appropriate value, in the storage unit 4, instead of the appropriate value. In this case, in the electric discharge machining apparatus 1, the electric discharge pulse number accumulating unit 9 performs the above-described specified arithmetic processing on the accumulated value to calculate the second calculated value. The electric discharge machine 1 performs a process of comparing a first calculated value based on the appropriate value with a second calculated value based on the integrated value, instead of the process of comparing the appropriate value and the integrated value. When the electric discharge machining apparatus 1 updates the first calculated value stored in the storage unit 4 based on the machining speed, it updates the second calculated value. The defined arithmetic processing is, for example, adding, subtracting, multiplying, or dividing a certain coefficient with respect to an appropriate value or an integrated value, but is not limited to these.

Embodiment 2.
In the first embodiment, the electric discharge machining apparatus 1 stores the appropriate value determined from the combination of the electrode material and the workpiece material, and appropriately updates the appropriate value in order to maximize the machining efficiency. However, the appropriate value is influenced not only by the combination of the electrode material and the workpiece material, but also by the processing area, processing conditions and the like. In the second embodiment, the electric discharge machining apparatus stores an appropriate value determined from the combination of the electrode material and the workpiece material, the machining area, and the machining condition, and appropriately maximizes the machining efficiency in order to maximize the machining efficiency. Update. The part different from the first embodiment will be described.

  FIG. 6 is a block diagram showing a configuration example of the electric discharge machine 1a according to the second embodiment. The electric discharge machining apparatus 1a is different from the electric discharge machining apparatus 1 of the first embodiment shown in FIG. 1 in that it includes a storage unit 4, a machining result storage unit 15, and an updating unit 16, a storage unit 4a, a machining result storage unit 15a, and It is replaced with the updating unit 16a, and a machining area calculating unit 17 is further added.

  The machining area calculator 17 calculates the machining area of the electrical discharge machining for the workpiece 132. A specific calculation method in the processed area calculation unit 17 will be described later.

  The storage unit 4 a stores the electrode material and the workpiece material input to the material information input unit 2 and the machining conditions of electric discharge machining input to the machining condition input unit 3. The storage unit 4a also stores an appropriate value of the number of discharge pulses per unit time, which is determined from a combination of the electrode material, the workpiece material, the processing area, and the processing conditions. FIG. 7 shows the number of discharge pulses per unit time determined by the combination of the electrode material, the workpiece material, the processing area, and the processing conditions stored in the storage unit 4a of the electric discharge machining apparatus 1a according to the second embodiment. It is a figure which shows the suitable value of. The storage unit 4a stores appropriate values according to combinations of electrode materials, workpiece materials, processing areas, and processing conditions. For example, when the electrode material is copper and the workpiece material is iron, the storage unit 4a stores the machining area S1, the machining current I1, the machining voltage application time ON1, and the machining voltage V1 in the number of discharge pulses per unit time. N111 is stored as an appropriate value. As described above, the machining conditions include the machining current, the machining voltage application time, the machining voltage, and the non-application time when the machining voltage is not applied. Therefore, even if the non-application time item is added to FIG. Good. The appropriate value of the number of electric discharge pulses per unit time shown in FIG. 7 is an initial value and may be updated by a process during electric discharge machining of the electric discharge machine 1a described later. The electric discharge machine 1a updates the appropriate value of the number of electric discharge pulses per unit time so that the machining efficiency is maximized during machining.

  The processing result storage unit 15a stores the integrated value calculated by the discharge pulse number integration unit 9, the processing speed calculated by the processing speed calculation unit 14, and the processing area calculated by the processing area calculation unit 17. The processing result storage unit 15a stores at least the present time, that is, the latest integrated value, processing speed, and processing area, and the previous integrated value, processing speed, and processing area.

  The updating unit 16a updates the appropriate value stored in the storage unit 4a based on the integrated value, the processing speed, and the processing area stored in the processing result storage unit 15a in order to maximize the processing efficiency.

  Next, the control of the electric discharge machining apparatus 1a for keeping the number of electric discharge pulses generated during electric discharge machining at an appropriate value will be described. FIG. 8 is a flowchart showing a jump operation control method for keeping the number of electric discharge pulses generated during electric discharge machining at an appropriate value in the electric discharge machine 1a according to the second embodiment. The processing from step S1 to step S5 in the flowchart shown in FIG. 8 is the same as the processing from step S1 to step S5 in the flowchart of the first embodiment shown in FIG.

  In the electric discharge machine 1a, the machining area calculation unit 17 calculates the machining area using the equation (6) (step S21).

  Machining area = number of discharge pulses x (machining amount per discharge pulse / amount of advance in machining direction) (6)

  In the formula (6), the machining amount per discharge pulse is determined from the combination of machining conditions in which the electrode 131, the workpiece 132, the machining voltage, the machining current, etc. are set, and the machining amount shown in the electric discharge machining apparatus 1a is shown. It is assumed that it is stored in the processing amount storage unit. The processing area calculation unit 17 stores the calculated processing area in the processing result storage unit 15a.

  The updating unit 16a uses the latest machining speed stored in the machining record storage unit 15a, that is, the machining speed before the present jump operation, and the previous machining process before the jump operation stored in the machining record storage unit 15a. The speed is compared (step S6). When the processing speed during the processing before the current jump operation is higher than the processing speed during the processing before the previous jump operation (step S6: Yes), the updating unit 16a stores the data in the storage unit 4a in order to maximize the processing efficiency. Of the stored suitable values, the optimum value that the electrode material, the workpiece material, the processing area, and the processing conditions match is stored in the processing result storage unit 15a at the latest, that is, at the time of processing before the current jump operation. It is updated with the integrated value of (step S7). When the processing area, the processing condition, and the integrated value are newly input from the updating unit 16a, the storage unit 4a updates and stores an appropriate value that matches the processing area and the processing condition with the input integrated value. The updating unit 16a omits the process of step S7 when the machining speed during the machining before the current jump operation is equal to or lower than the machining speed during the machining before the previous jump operation (step S6: No).

  The subsequent processing from step S8 to step S18 in the flowchart shown in FIG. 8 is the same as the processing from step S8 to step S18 in the flowchart of the first embodiment shown in FIG. In the second embodiment, in the processing of step S11, the comparison unit 5 compares an appropriate value with which the electrode material, the workpiece material, the processing area, and the processing conditions in the current electric discharge machining match with the integrated value.

  The appropriate value of the number of discharge pulses during machining varies not only with the combination of the electrode material and the workpiece material, but also with the machining area, machining conditions and the like. For example, the number of discharge pulses is greater when the machining area is large than when the machining area is small. Further, the number of discharge pulses increases as the machining voltage increases, and increases as the machining current increases. Therefore, the appropriate value of the number of discharge pulses during machining can be further subdivided by giving information on the machining conditions including the machining voltage and the machining area, as shown in FIG. The electric discharge machining apparatus 1a can precisely control the integrated value, that is, the number of electric discharge pulses during machining, by using an appropriate value subdivided as compared with the case of the first embodiment.

  In the electric discharge machine 1a, when the machining area is known in advance by machining in a square shape or the like, the user directly inputs the machining area to the electric discharge machine 1a via a machining area input unit (not shown). Good. As a result, the electric discharge machining apparatus 1a does not need to estimate the machining area, so that the number of electric discharge pulses can be maintained at an appropriate value immediately after the start of machining. In this case, the electric discharge machine 1a does not require the process of step S21 for calculating the machining area in the flowchart shown in FIG.

  As described above, according to the present embodiment, the electric discharge machining apparatus 1a stores an appropriate value according to the combination of the electrode material, the workpiece material, the machining area, and the machining conditions, and the current electric discharge machining An appropriate value based on the state, that is, an appropriate value that the electrode material, the workpiece material, the processing area, and the processing conditions match in the current electric discharge machining is used to control the jump operation of the electrode 131. As a result, the electric discharge machining apparatus 1a can control the integrated value, that is, the number of electric discharge pulses during machining, with high accuracy by using the subdivided appropriate value as compared with the case of the first embodiment.

  The configurations shown in the above embodiments are examples of the content of the present invention, and can be combined with another known technique, and the configurations of the configurations are possible without departing from the gist of the present invention. It is possible to omit or change a part.

  1, 1a Electric discharge machine, 2 Material information input section, 3 Machining condition input section, 4, 4a Storage section, 5 Comparison section, 6 Jump parameter adjustment section, 7 Jump operation control section, 8 Discharge pulse detection section, 9 Discharge pulse Number integration unit, 10 Z-axis motor control unit, 11 Z-axis motor, 12 Machining power supply control unit, 13 Machining unit, 14 Machining speed calculation unit, 15, 15a Machining result storage unit, 16, 16a Update unit, 17 Machining area calculation Part, 131 electrode, 132 work piece.

Claims (5)

Information of an electrode material that is a material of an electrode used in electrical discharge machining, and a material information input unit that receives information of a workpiece material that is a material of a workpiece of the electrical discharge machining,
A machining condition input unit that receives an input of machining conditions for the electric discharge machining;
A discharge pulse detection unit that detects a discharge pulse generated during electric discharge machining,
A total number of discharge pulses, a discharge pulse number integrating unit for calculating an integrated value of discharge pulses per unit time,
A jump operation control unit that controls the jump operation based on a jump condition of the jump operation of the electrode included in the processing condition;
A storage unit in which an appropriate value of the number of discharge pulses per unit time during electric discharge machining determined from a combination of the electrode material and the workpiece material is stored,
A comparison unit that compares the appropriate value and the integrated value,
A jump parameter adjusting unit that adjusts the jump condition based on a comparison result between the appropriate value and the integrated value,
The electric discharge machining apparatus according to claim 1, wherein the jump operation control unit controls the jump operation based on the content adjusted by the jump parameter adjustment unit. A machining speed calculation unit for calculating the machining speed of the electric discharge machining;
A processing result storage unit that stores the processing speed and the integrated value,
When the machining speed before the current jump operation is higher than the machining speed before the previous jump operation, the appropriate value stored in the storage section is used as the integrated value during the machining before the current jump operation. An update section to update,
The electric discharge machining apparatus according to claim 1, further comprising: A machining area calculation unit for calculating the machining area of the electric discharge machining,
Equipped with
The storage unit stores an appropriate value according to a combination of the electrode material, the workpiece material, the processing condition, and the processing area,
The comparison unit compares the electrode material, the workpiece material, the machining conditions, and an appropriate value at which the machining area matches in the current electric discharge machining, and the integrated value.
The electric discharge machining apparatus according to claim 1, wherein an appropriate value based on the current state of electric discharge machining is used. The jump parameter adjusting unit determines a magnification for adjusting each parameter of the jump condition based on a ratio of the integrated value to the appropriate value,
The electric discharge machining apparatus according to claim 1, wherein The comparison unit determines the number of discharge pulses per unit time during electric discharge machining determined from a combination of an electrode material that is a material of an electrode used in electric discharge machining and a work material that is a material of a work piece of the electric discharge machining. And a comparison step of comparing the integrated value of the electric discharge pulses per unit time obtained by integrating the number of electric discharge pulses generated during electric discharge machining,
An adjustment step in which a jump parameter adjusting unit adjusts a jump condition of a jump operation of the electrode based on a comparison result between the appropriate value and the integrated value,
Including,
In the adjusting step, the jump parameter adjusting unit,
When the integrated value is smaller than the appropriate value, at least one of shortening the jump distance, increasing the jump down time, and decreasing the jump speed is executed in the next jump operation with respect to the current jump operation. Adjust the jump conditions to
When the integrated value is larger than the appropriate value, at least one of increasing the jump distance, shortening the jump down time, and increasing the jump speed in the next jump operation with respect to the current jump operation is executed. Adjust the jump conditions to
If the integrated value is equal to the appropriate value, the setting of the jump condition of the current jump operation is maintained in the next jump operation,
A jump operation control method characterized by the above.

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