JP4512049B2 - Wire electrical discharge machine - Google Patents

Description

  The present invention relates to a wire electric discharge machining apparatus.

In general, wire electric discharge machining is performed in 3 to 7 steps while changing the machining conditions from large energy to small one such as rough machining, medium machining, medium finishing machining, and finishing machining. This is for the purpose of increasing the straightness of the processed surface in addition to the purpose of reducing the processing time by gradually reducing the surface roughness. Also, in wire electrical discharge machining, the wire part facing the center part of the workpiece is dented or swelled to the so-called “bush shape” from the vibration of the wire due to electrical discharge repulsive force, electrostatic force, etc. It is known to be. Further, the wire electric discharge machining is completely different in the first machining (rough machining) and the second and subsequent machining (medium machining, intermediate finishing machining, finishing machining, etc.). In the first machining, since a solid workpiece is machined, the machining waste is not sufficiently removed from the workpiece, and there is a concern that the wire may be disconnected due to the remaining machining waste.
Therefore, the conventional wire electric discharge machining apparatus shown in FIG. 14 has an input means 120 for inputting the workpiece thickness, nozzle height, etc., as shown in Patent Document 1, for example, charging voltage, on time, off A processing condition storage unit 121 that stores time and the like, a hydraulic pressure calculation unit 122 that calculates the nozzle hydraulic pressure from the nozzle height and the like, and a processing condition change unit 123 that changes the processing condition based on the calculated nozzle hydraulic pressure, The nozzle fluid pressure, that is, the machining fluid pressure is obtained from the height, and the machining conditions are changed from the machining fluid pressure.
Japanese Patent Publication No. 7-16825

  However, in the first machining, if the nozzle is sufficiently away from the workpiece, the wire length is not the machining fluid pressure, but the wire breakage, so in the method of calculating the machining conditions from the machining fluid pressure, It is difficult to reliably prevent the wire from being broken. In actual experiments, the machining fluid pressure changes when the distance from the upper nozzle to the workpiece is 2 mm (in the case of a plate thickness of 20 mm and Φ.25 wire), but the machining fluid pressure does not change even if the distance is further. However, there is a problem that if the wire is long, it is easy to bend, it becomes difficult to control at the time of a short circuit, and the possibility that the wire is disconnected increases. The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a wire electric discharge machining apparatus in which a wire is hardly broken even when a nozzle is separated from a workpiece. Furthermore, in wire electric discharge machining, surface accuracy and machining accuracy on the machining surface are important, but conventionally such machining accuracy has not been considered.

Wa ear discharge machining apparatus of the present invention, in the wire electric discharge machining apparatus for machining a workpiece by a predetermined machining conditions together with an intervening dielectric fluid in the gap between the wire and the workpiece, a reference for setting the processing conditions, the charge Processing condition storage means for holding standard machining conditions having voltage, on-time, off-time, and shift amount, and shift correction information indicating dependency of the wire shift amount on the workpiece plate thickness and nozzle height are stored. A shift amount correction value for a wire in processing is determined from the shift amount correction information stored in the shift amount correction information storage means based on the shift amount correction information storage means and the input workpiece plate thickness and nozzle height information. The amount of wire correction included in the standard processing conditions held in the amount correction value determining means and the processing condition storage means and sent from the processing condition storage means is determined as the determined wire width. By changing in shift amount correction value; and a shift amount correction value changing means for changing the standard machining conditions, and is configured to machine the workpiece by the modified machining conditions.

According to this inventions, since the shift amount in consideration of the deflection amount of the wire, there is an effect that the surface accuracy is improved.

  Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 1 is a block diagram showing Embodiment 1 of the present invention. In the figure, reference numeral 1 denotes an input means, and usually a keyboard is used. 2 is a processing energy determination means, and 3 is a processing energy database. As shown in FIG. 2, the processing energy amount at which the wire does not break with respect to the workpiece thickness, the upper nozzle height, and the lower nozzle height. Is described as a ratio to the normal standard processing conditions. Here, the nozzle height represents, for example, a state in which the upper nozzle 70 is separated from the work 72 as shown in FIG. This ratio data is only related to the first machining. The processing energy determination means 2 determines the processing energy based on data relating to the plate thickness, the upper nozzle height, and the lower nozzle height read from the processing energy database 3. The processing energy data determined by the processing energy determining means 2 is sent to the processing condition changing means 4. Reference numeral 5 denotes a processing condition storage means for storing a charging voltage, an on time, an off time, a shift amount and the like as standard processing conditions (n process: n ≧ 1) when the nozzle is in close contact (the nozzle is in close contact with the workpiece). Has been. The processing condition changing means 4 changes the processing conditions sent from the processing condition storage means based on the data representing the processing energy determined by the processing energy determination means 2 and outputs it to the controller 7 or the screen of the output / display means 6. The processing conditions are displayed on (not shown). Here, the nozzle height represents, for example, a state in which the upper nozzle 70 is separated from the work 72 as shown in A of FIG. FIG. 2 is a flowchart showing the operation of Embodiment 1 of the present invention.

  Next, the first operation will be described with reference to FIG. The material, plate thickness, wire diameter, upper nozzle height, lower nozzle height, etc. are input from the input means 1 to the processing energy determination means 2 (ST1-1). The machining condition storage means 3 stores standard machining conditions stored in advance when the nozzle is in close contact, which is determined by the material, plate thickness, wire diameter, and the like. It is sent to the condition changing means 4 (ST1-2). The processing energy determination means 2 is stored in the processing energy database 3 based on the material, plate thickness, wire diameter, upper nozzle height, lower nozzle height, etc. input from the input means 1 as shown in FIG. A processing energy amount is determined from the table (ST2-3). In FIG. 3, for example, when the plate thickness is 10, the upper nozzle separation amount is 20, and the lower nozzle separation amount is 0, the processing energy amount is 0.5 of No. 2 in FIG. The machining energy determination means 2 determines the machining energy amount of 50% of the second time. This information of 0.5 is sent from the machining energy determining means 2 to the machining condition changing means 4. In the machining condition changing means 4, the machining energy amount is set to 50% by increasing the off time. In the machining condition changing means 4, the standard first machining condition is changed from the machining energy amount (ST2-4). The changed first machining condition is sent to the controller 7 together with the second and subsequent machining conditions that have not been changed, and is displayed on the screen of the output and display means 6 (not shown) (ST1-5). The controller 7 performs the first machining of the workpiece according to the machining conditions. In the second and subsequent processing, since it is not necessary to reduce the amount of processing energy because there is no disconnection, the processing is performed without changing the processing conditions. According to the first embodiment, since the amount of energy is controlled according to the amount of nozzle separation, there is an effect that disconnection can be prevented.

In the first embodiment, the processing energy amount is described in the processing energy database. However, the processing energy amount may be expressed by an approximate relational expression of the energy amount obtained from the nozzle height and the plate thickness.
Further, the method of increasing the processing energy amount to 50% has been described with respect to the method of increasing the off time. However, various methods such as reducing the on time and increasing the servo voltage can be applied.
If the amount of machining energy corresponding to the wire nozzle separation amount is not known, the amount of machining energy, for example, 0.4 may be directly input.
Although the standard machining conditions are stored in the machining condition storage unit 5 in advance, the standard machining conditions may be determined by another unit, for example, an input by a user.
In addition, how to express the amount of energy is described as the ratio of the standard machining conditions to the first machining, but the energy amount within a certain time was directly calculated from the current waveform information such as the on time and off time. It may be a value. This amount of energy represents the actual amount of energy itself. On the other hand, the amount of energy in FIG. 3 is different in that it represents a ratio to the standard processing conditions as described above.

  FIG. 4 is a block diagram showing Embodiment 2 of the present invention, and FIG. 5 is a flowchart showing the operation of Embodiment 2 of the present invention. In the figure, reference numeral 1 denotes input means similar to that in the first embodiment, and a keyboard is usually used. Reference numeral 30 denotes a liquid flow rate determining means relating to the machining liquid flow rate (hereinafter referred to as liquid flow rate), and 31 denotes a liquid flow rate database. As shown in FIG. 6, the liquid flow rate database 31 includes a workpiece plate thickness and an upper nozzle height. The amount of the wire that does not break with respect to the height of the lower nozzle is described as a ratio to the normal standard processing conditions. This ratio data is only related to the first machining. The liquid flow rate determining means 30 determines the liquid flow rate based on the data read from the liquid flow rate database 31. The liquid flow rate data determined by the liquid flow rate determining means 30 is sent to the liquid flow rate changing means 32. Reference numeral 5 denotes processing condition storage means similar to that in the first embodiment. As standard processing conditions (n process: n ≧ 1) when the nozzle is in close contact (the nozzle is in close contact with the workpiece), the charging voltage, the on time, and the off time In addition, the shift amount, the liquid flow rate, and the like are stored. The liquid flow rate changing unit 32 changes the liquid flow rate (liquid flow rate parameter) sent from the processing condition storage unit 5 based on the liquid flow rate determined by the liquid flow rate determining unit 30, and the changed liquid flow rate is output to the controller 7. At the same time, it is output and displayed on a screen (not shown) of the display means 6.

Next, the first machining operation will be described with reference to FIG. The material, plate thickness, wire diameter, upper nozzle height, lower nozzle height, etc. are input from the input means 1 to the liquid flow rate determining means 30 (ST2-1). The processing condition storage means 5 stores standard processing conditions stored in advance when the nozzles determined by the material, plate thickness, wire diameter, etc. are in close contact, and the standard processing conditions are the liquid flow rate. It is sent to the changing means 12 (ST2-2). When the material, plate thickness, wire diameter, upper nozzle height, lower nozzle height, etc. are input from the input unit 1, the liquid flow rate determination unit 30 determines the liquid flow rate based on the liquid flow rate from the liquid flow rate database 31. (ST2-3). For example, when the plate thickness is 10, the upper nozzle separation amount is 20, and the lower nozzle separation amount is 0, the liquid flow rate is 0.5 of No. 2 in FIG. Is determined by the liquid flow rate determining means 30. This information of 50% is sent from the liquid flow rate determining means 30 to the liquid flow rate changing means 32. In the liquid flow rate changing means 32, the liquid flow rate (liquid flow rate parameter) relating to the standard first processing is changed for the liquid flow rate sent from the processing condition storage means 5 (ST2-4). The changed first liquid flow rate is sent to the controller 7 together with the second and subsequent machining conditions that have not been changed. The changed liquid flow rate is displayed on the screen (not shown) of the display means 6 (ST2-5). The controller 33 performs the first machining of the workpiece according to the changed liquid flow rate. In the second and subsequent processing, one side of the wire is opened and is not affected by the liquid flow rate, so the processing is performed without changing the liquid flow rate.
By adjusting the liquid flow rate, the flow of machining liquid is made smooth and disconnection is prevented. For example, it is known that when the upper nozzle is separated, disconnection is less likely to occur when the amount of the upper nozzle liquid is halved than usual. According to the second embodiment, since the machining fluid amount is controlled according to the nozzle separation amount, there is an effect that disconnection can be prevented.

Although the liquid flow rate is described in the liquid flow rate database 31, it may be expressed by an approximate relational expression of the liquid flow rate obtained from the nozzle height and the plate thickness.
In addition, although the standard machining conditions are stored in the machining condition storage unit 5 in advance, the standard machining conditions may be determined by another unit, for example, an input by a user.

  FIG. 7 is a block diagram showing Embodiment 3 of the present invention, and FIG. 8 is a flowchart showing the operation of Embodiment 3 of the present invention. In the figure, reference numeral 1 denotes an input means, and a keyboard is usually used as in the first embodiment. 50 is an inclination correction value determining means, and 51 is an inclination correction value database. As shown in FIG. 9, the database compensates for accuracy with respect to the workpiece thickness, upper nozzle height, and lower nozzle height. The wire inclination correction value is described as a correction value for the wire inclination of all processes in normal standard machining. Inclination correction value determination means 50 determines the inclination correction value of the wire based on the data read from inclination correction value database 51. The data of the inclination correction value determined by the inclination correction value determining means 50 is sent to the multi-step inclination correction value changing means 52. 53 is a multi-process machining condition storage means, and as standard machining conditions (n process: n ≧ 1) when the nozzle is in close contact (nozzle is in close contact with the workpiece), the charging voltage, on-time, off-time, offset amount, The inclination of the wire is stored. The multi-step tilt correction value changing unit 52 changes the machining condition (wire tilt parameter) sent from the multi-step machining condition storage unit 53 based on the tilt correction value determined by the tilt correction value determining unit 50, and sends it to the controller 54. Output or display the tilt correction value on the screen of the output and display means 6 (not shown).

  Next, the operation will be described with reference to FIG. The material, plate thickness, wire diameter, upper nozzle height, lower nozzle height, etc. are input from the input means 1 (ST3-1). The multi-step machining condition storage means 53 stores standard machining conditions stored in advance when the nozzles determined by the material, plate thickness, wire diameter, etc. are in close contact, and the standard machining conditions are It is sent to the multi-step inclination correction value changing means 52 (ST3-2). When the material, plate thickness, wire diameter, upper nozzle height, lower nozzle height, etc. are input from the input means 1, the inclination correction value determination means 50 is based on the inclination correction value sent from the inclination correction value database 51. An inclination correction value is determined (ST3-3). For example, when the plate thickness is 10, the upper nozzle separation amount is 20, and the lower nozzle separation amount is 0, the inclination correction value is 5 of No. 2 in FIG. 6, and this information of 5 determines the inclination correction correction value. The information is sent from the means 50 to the multi-step inclination correction value changing means 52. In the multi-step tilt correction value changing means 52, the tilt correction value 5 is used to change the tilt (slope parameter) of the processing condition with respect to the first to n-th standard processing conditions (ST3-4). The changed first to n-th machining conditions are sent to the controller 54 and output and displayed on the screen (not shown) of the display means 6 (ST3-5). The controller 54 tilts the wire according to the processing conditions and performs the first to n-th processing.

  FIG. 10 is an image diagram when the nozzle is separated from the workpiece. In C, when the upper nozzle 70 and the lower nozzle 71 are in close contact with the work 72, the solid lines A and B indicate that the upper nozzle 70 is separated from the work 72 and the wire 73 is deflected, causing a discharge repulsive force or static electricity. The case where the taper surface T arises in the workpiece | work shape by force is shown. Thus, in the case of B, for example, as shown by the dotted line, the upper nozzle 70 is extended in the outer direction indicated by the arrow, and the wire 73 is inclined by the angle θ by the inclination correction value of the wire 73, so that the workpiece surface becomes vertical by machining. Surface P can be finished.

In the third embodiment, the wire tilt amounts of all the processes are corrected with the same tilt correction value stored in the tilt correction value database 51. However, for example, only the nth process may be corrected, Depending on the process, the inclination correction value may be provided separately for the process, the second process, and the n-th process.
Further, although the wire inclination correction value is described in the inclination correction value database 51, it may be expressed by an approximate relational expression of the wire inclination correction value obtained from the nozzle height and the plate thickness.
In the third embodiment, it is described that the machining condition has a wire inclination correction value. However, even if the wire inclination correction value is different from the machining condition, the wire inclination is corrected during machining. If possible.
In Examples 1 and 2 described above, the machining conditions and the liquid flow rate were adjusted to prevent disconnection in the first machining, but in Example 3, the surface accuracy and shape accuracy of the machined surface can be improved. it can.

  FIG. 11 is a block diagram showing Embodiment 4 of the present invention, and FIG. 12 is a flowchart showing the operation of Embodiment 4 of the present invention. In the figure, reference numeral 1 denotes an input means, and a keyboard is usually used as in the first embodiment. 81 is a shift amount correction value determining means, and 82 is a shift amount correction value database. As shown in FIG. 13, the database compensates for accuracy with respect to the plate thickness of the workpiece, the upper nozzle height, and the lower nozzle height. The second-stage machining offset correction value described here is described as a correction amount for the second-time machining offset under the normal standard machining conditions. The approach amount correction value determining means 71 determines the approach amount correction value based on the data read from the approach amount correction value database 82. The amount correction value data determined by the amount correction value determining unit 81 is sent to the multi-step amount correction value changing unit 83. Reference numeral 84 denotes a multi-process machining condition storage means. As standard machining condition data (n process: n ≧ 1) when the nozzle is in close contact (the nozzle is in close contact with the workpiece), the charging voltage, the on time, the off time, and the shift amount Etc. are stored. The multi-step shift correction value changing unit 73 changes the shift correction value for the second machining sent from the multi-work machining condition storage unit 84 based on the shift correction value determined by the shift correction value determining unit 81. , Output to the controller 85, or display the shift correction value on the screen (not shown) of the output and display means 6.

Next, the operation will be described with reference to FIG. The material, plate thickness, wire diameter, upper nozzle height, lower nozzle height, etc. are input from the input means 1 (ST4-1). The multi-process machining condition storage means 84 stores standard machining conditions stored in advance when the nozzle determined by the material, plate thickness, wire diameter, etc. is in close contact, and the standard machining conditions are It is sent to the multi-process shift amount changing means 73 (ST4-2). When the material, plate thickness, wire diameter, upper nozzle height, lower nozzle height, and the like are input from the input unit 1, the shift amount correction value determining unit 81 is based on the shift amount correction value in the shift amount correction value database 72. Determine the shift correction value. For example, when the plate thickness is 10, the upper nozzle separation amount is 20, and the lower nozzle separation amount is 0, the offset correction value is 10 of No. 2 in FIG. The correction value 10 is determined (ST4-3). This information of 10 is sent from the shift amount correction value determining means 81 to the multi-step shift amount correction value changing means 83. In the multi-step shift amount correction value changing unit 83, the multi-step shift amount correction value changing unit 83 changes the shift amount of the standard second processing condition from the shift amount correction value (ST4-4). The changed machining conditions for the second shift amount are sent to the controller 85 together with the first machining conditions and the third and subsequent machining conditions, and output to a screen (not shown) of the display means 6. It is displayed (ST4-5). The controller 85 performs processing according to the processing conditions.
FIG. 14 is an image view when the upper nozzle 80 and the lower nozzle 81 are separated. In the state where the nozzles are separated, the wire 83 is deflected, and when the second machining is performed, if the wire 73 is in the position of the solid line, the machining surface of the workpiece 72 is a concave portion, so that discharge occurs in the center of the workpiece. Disappear. Therefore, the processing accuracy can be improved by moving the upper nozzle 80 and the lower nozzle 81 in the direction of the arrow as indicated by dotted lines and changing the amount of shift. Here, as shown in FIG. 14, the shift amount is a distance for sliding the upper nozzle 80 and the lower nozzle 81 by the same distance (from the positions of both nozzles and wires shown by solid lines to the positions shown by broken lines). I mean.

In the fourth embodiment, the shift amount correction value in the second machining is stored in the database, but only another process is corrected, or for the first process, the second process, and the nth process. You may have a correction value separately according to a process.
In the fourth embodiment, other processing conditions that affect the amount of shift may be changed. For example, the amount of shift may be changed when the on time, the machining feed rate, the discharge voltage, or the like is changed.

  FIG. 15 is a block diagram showing Embodiment 5 of the present invention, and FIG. 16 is a flowchart showing the operation of Embodiment 5 of the present invention. In the figure, reference numeral 1 denotes an input means, and a keyboard is usually used as in the first embodiment. 100 is a nozzle height detecting means for automatically obtaining the nozzle height, 101 is a processing speed database in which the relationship between the processing speed and the nozzle separation amount is described, 81 is a shift amount correction value determining means, and 82 is a shift amount correction value. As shown in FIG. 17, in this database, the correction amount correction value for the second machining in which the accuracy is compensated for the workpiece thickness, the upper nozzle height, and the lower nozzle height, It is described as a correction amount with respect to the shift amount of the second machining under the standard machining conditions. The approach amount correction value determining means 71 determines the approach amount correction value based on the data read from the approach amount correction value database 82. The amount correction value data determined by the amount correction value determining unit 81 is sent to the multi-step amount correction value changing unit 83. Reference numeral 84 denotes a multi-process machining condition storage means, and the standard machining condition data (n process: n ≧ 1) at the time of nozzle close contact (nozzle is in close contact with the workpiece) is charged voltage, on time, off time, and amount of shift. Etc. are stored. The multi-step shift amount correction value changing unit 83 changes the shift amount correction value for the second machining sent from the multi-work machining condition storage unit 84 based on the shift amount correction value determined by the shift amount correction value determining unit 81. , Output to the controller 85, or display the shift correction value on the screen (not shown) of the output and display means 6.

  Next, the operation will be described with reference to FIG. The material, plate thickness, wire diameter, etc. are input from the input means 1 (ST5-1). The multi-process machining condition storage means 84 stores standard machining conditions stored in advance when the nozzle determined by the material, plate thickness, wire diameter, etc. is in close contact, and the standard machining conditions are It is sent to the multi-process shift amount changing means 83. Processing is started (ST5-2). During the first machining, the nozzle height detection means 100 detects the machining speed, extracts the nozzle height from the machining speed database 101 shown in FIG. 15 (ST5-4), and displays the screen of the display means 6 (FIG. The nozzle height is displayed as shown by C in FIG. 18 (not shown) (ST5-5). Here, FIG. 18 shows a display screen, on which an upper nozzle 70, a lower nozzle 71, a work 72, spaces 75 and 76 for inputting the heights of the upper nozzle and the lower nozzle are displayed. As shown in C, 20 values are displayed in the space 75, and the 20 nozzles are converted into coordinate values on the display screen so that the upper nozzle 70 is positioned so that the height of the upper nozzle is 20 mm. Is displayed. It has been found that when the nozzle is separated, the vibration width of the wire increases, so that the actual processing amount increases and the processing speed decreases. According to FIG. 12, for example, when the processing speed is 5, No. As shown in FIG. 2, the upper nozzle is 20 and the lower nozzle is 0. The amount-of-shift correction value determining unit 81 receives the amount-of-shift correction value when the material, the plate thickness, and the wire diameter are input from the input unit 1 and the upper nozzle height, the lower nozzle height, and the like are input from the nozzle height detection unit 100. A correction amount correction value is determined based on the correction amount correction value in the database 72 (ST5-6). For example, when the plate thickness is 10, the upper nozzle separation is 20, and the lower nozzle separation is 0, the offset correction value is 10 of No. 2 in FIG. A correction value 10 is determined. This information of 10 is sent from the shift amount correction value determining means 81 to the multi-step shift amount correction value changing means 83. In the multi-step shift amount correction value changing unit 83, the multi-step shift amount correction value changing unit 83 changes the shift amount of the standard second processing condition from the shift amount correction value (ST5-7). The changed machining conditions for the second shift amount are sent to the controller 85 together with the first machining conditions and the third and subsequent machining conditions, and output to a screen (not shown) of the display means 6. It is displayed (ST5-8). The controller 85 performs processing according to the processing conditions.

In the fifth embodiment, the detected nozzle height is displayed on the display unit, but may be displayed when the user inputs the nozzle height in the first to fourth embodiments. In that case, when the initial state is A in FIG. 18 and the user inputs the nozzle height “20” as in B, the value of 20 is converted into a coordinate value on the screen display, and based on this converted value Then, a graphic screen in which the upper nozzle is moved is displayed at a position where the nozzle is 20 mm higher as in C.
In each of the above-described embodiments, the user inputs from the keyboard. However, the input is a value input from another input unit or an external system that automatically measures the height of the nozzle. There may be.
In the fifth embodiment, since the machining state is detected as the machining speed, correction that is automatically adapted to the nozzle height is performed without the user inputting data such as the nozzle height, and the surface accuracy is improved. Can be improved.

  In all of the embodiments described above, it has been described as being configured in a wire electric discharge machining apparatus, but may be provided outside a wire electric discharge machining apparatus, for example, on a CAD / CAM system. And Such a case is included in the scope of the present invention as a wire electric discharge machining apparatus including the separated CAD / CAM.

  The present invention can improve the wire breakage in the wire electric discharge machining apparatus and improve the surface accuracy and shape accuracy of the machined surface, and therefore can be effectively used for wire electric discharge machining.

It is a block diagram which shows the structure by Example 1 of this invention. It is a flowchart which shows operation | movement of Example 1 of this invention. It is explanatory drawing which shows the structure of the processing energy database in Example 1 of this invention. It is a block diagram which shows the structure by Example 2 of this invention. It is a flowchart which shows operation | movement of Example 2 of this invention. It is explanatory drawing which shows the structure of the liquid flow rate database in Example 2 of this invention. It is a block diagram which shows the structure by Example 3 of this invention. It is a flowchart which shows operation | movement of Example 3 of this invention. It is explanatory drawing which shows the structure of the inclination correction value database in Example 3 of this invention. It is a block diagram which shows the state of the wire in Example 3 of this invention. It is a block diagram which shows the structure by Example 4 of this invention. It is a flowchart which shows operation | movement of Example 4 of this invention. It is explanatory drawing which shows the structure of the inclination close amount correction value database in Example 4 of this invention. It is a block diagram which shows the state of the wire in Example 4 of this invention. It is a block diagram which shows the structure by Example 5 of this invention. It is a flowchart which shows operation | movement of Example 5 of this invention. It is explanatory drawing which shows the structure of the processing speed database by Example 5 of this invention. It is a block diagram which displays the wire nozzle separation state in Examples 1-4 of this invention as a graphic. It is a block diagram which shows the structure of the conventional wire electric discharge machining apparatus.

Explanation of symbols

1 input means, 2 processing energy determination means, 4 processing condition change means, 5
Processing condition storage means, 30 liquid flow rate determination means, 32 liquid flow rate change means, 50
Inclination correction value determination means, 52 Multi-process inclination correction value change means, 53 Multi-process machining condition storage means, 81 Shift amount correction value determination means, 83 Multi-process inclination correction value change means, 84 Multi-process machining condition storage means, 100 Nozzle Height detection means.

Claims (1)

Charging voltage, on time, off time, and amount of shift used as a reference when setting machining conditions in a wire electrical discharge machining apparatus that processes a workpiece under predetermined machining conditions while interposing a machining fluid in the gap between the wire and the workpiece A processing condition storage means for holding standard processing conditions having a cutting amount correction information storage means for storing shift amount correction information indicating dependency of the wire shift amount on the workpiece plate thickness and the upper and lower nozzle height, and input A shift amount correction value determining means for determining a wire shift amount correction value in processing from the shift amount correction information stored in the shift amount correction information storage means based on the workpiece plate thickness and the upper and lower nozzle height information; The wire approach amount held in the machining condition storage means and included in the standard machining conditions sent from the machining condition storage means is changed by the determined wire approach amount correction value. And by, by and a shift amount correction value changing means for changing the standard machining conditions, wire electric discharge machining apparatus characterized by processing the workpiece by the modified machining conditions.

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