JP3875253B2 - EDM machine - Google Patents

Description

  The present invention relates to an electric discharge machining apparatus that performs three-dimensional control of an electrode having a simple shape and performs mold fabrication and component machining.

  2. Description of the Related Art Conventionally, there is known an electric discharge machining apparatus that processes a desired three-dimensional shape by performing three-dimensional control on an electrode having a relatively simple shape such as a column, cylinder, or prism by an NC controller. In such an electric discharge machining apparatus, it is not necessary to produce a complex three-dimensional shape of the total electrode, and the mold production cost and production time can be greatly improved. In addition, since the electrode shape can be defined in advance, it is easy to introduce a CAM system and the like, and automation of the machining process can be expected.

  However, in such electric discharge machining, electrode consumption becomes a serious problem in terms of machining accuracy as compared with electric discharge machining using a total-type electrode. In order to solve such problems, a series of research reports “three-dimensional controlled electrical discharge machining with cylindrical electrodes (1st report)” by Tatsuya Kaneko and others at Yamagata University, Vol. 17, no. 33, p31 / 44 (1983), “Three-Dimensional Controlled Electrical Discharge Machining with a Cylindrical Electrode (2nd Report)” Journal of the Electromachining Society, Vol. 17, no. 34, p. In 1/12 (1984), when cutting a certain amount into the Z axis while rotating a columnar or cylindrical electrode and then performing planar machining with the X and Y axes, correction data for the electrode wear length obtained in advance from measured data is obtained. A method has been proposed in which the electrode is fed by the amount of wear that is given during the program and predicted as the machining progresses.

FIG. 60 is a block diagram showing a configuration of a conventional electric discharge machining apparatus that employs the above-described correction of electrode consumption.
In the figure, 1 is an XY table driven in the X and Y directions by drive motors 2 and 3, 4 is a workpiece placed on the XY table 3, 5 is a main shaft, and 6 is the tip of the main shaft 5. A machining electrode fixed in correspondence with the workpiece 4 and having a simple shape such as a cylinder or a cylinder, for example, 7 is an electrode for transmitting the driving force of the drive motor to the machining electrode 6 via the main shaft 5 and rotating it. It is a rotation mechanism.

  9 is a machining power source for applying a pulsed current between the machining electrode 6 and the workpiece 4, 10 is a machining path storage means in which machining paths not considered for correction are stored, and 11 is the consumption of the machining electrode 6. A correction data storage means 12 that stores correction data for correction, and 12 uses the correction data stored in the correction data storage means 11 to correct the machining path stored in the machining path storage means 10 and to provide an electrode path. 13 is an electrode path command means for sending an electrode path command based on the electrode path generated by the electrode path generation means 12, and 14 is an electrode path sent by the electrode path command means 13. It is an electrode position control means for setting the position of the machining electrode 6 by controlling the drive motors 2 and 3 based on the command.

  Next, the operation of the conventional electric discharge machining apparatus configured as described above will be described. First, prior to machining, a wear compensation parameter is determined by a preliminary experiment. If the electrode wear is in a steady state, the relationship z = mL is established between the trajectory feed length L and the electrode wear length z via the correction data m, so that machining is performed over an appropriate machining length L, What is necessary is just to calculate m by measuring the electrode consumption length z. Of course, if m can be determined based on previous experiments, known experience, knowledge, theory, etc., preliminary experiments are unnecessary.

  Now, since the machining path set according to the machining shape of the workpiece 4 and stored in the machining path storage means 10 does not consider the consumption of the machining electrode 6, the electrode path generation means 12 performs correction data storage means. 11 is used to generate corrected trajectory data in which a trajectory with a consumption length Δz = m · ΔL in the electrode longitudinal direction is added for each unit trajectory feed length ΔL to compensate for the electrode consumption. An electrode path is created and sent to the electrode path command means 13.

Next, an electrode path command is sent out based on this electrode path by the electrode path command means 13, and the electrode position control means 14 moves the XY table 1 by controlling each drive motor 2, 3 by this electrode path command, The position of the machining electrode 6 with respect to the workpiece 4 is set, and the workpiece 4 is machined into a desired shape.
That is, as shown in the flow in FIG. 61 , the machining path is corrected using the correction data m to generate an electrode path, and the machining is performed based on the electrode path.

Needless to say, the amount of consumption of the machining electrode 6 needs to be determined by taking into account the machining amount difference caused by the machining locus, and the correction data m has a coefficient depending on the machining amount.
Further, a consumption correction method similar to that described above is described in, for example, Japanese Patent Laid-Open No. 5-345229.

  Furthermore, a research report by Yamagata University "Learning prediction correction control in contour electric discharge machining", Journal of Electromachining Society, Vol. 11, no. 33, p7 / 11 (1987), in order to make the correction data m more accurate, contact data is detected during processing to confirm the actual consumption amount, and the correction data stored in the correction data storage means 11 A method for changing m in accordance with the amount of wear has also been proposed.

FIG. 62 is a block diagram showing the configuration of an electric discharge machining apparatus that employs the above-described correction of electrode consumption.
In the figure, the same parts as electric discharge machining apparatus shown in FIG. 60 will be omitted with denoted by the same reference numerals. Reference numeral 15 denotes an electrode consumption measuring means for measuring electrode consumption by contact detection for each fixed measurement section ΔL, and 16 denotes correction data m in the correction data storage means 11 measured by the electrode consumption measurement means 15 according to the electrode consumption. Correction data correction means 17 for correction is a correction means for correcting the position setting of the machining electrode 6 by correcting the control amount by the electrode position control means 14 based on the correction data m corrected by the correction data correction means 16. is there.

  Next, the operation of the conventional electric discharge machining apparatus configured as described above will be described. First, the correction means 17 uses the correction data m stored in advance in the correction data storage means 11 to add a trajectory having a consumption length Δz = m · ΔL in the electrode longitudinal direction for each unit trajectory feed length ΔL. Thus, the electrode path commanded from the electrode path command means 13 to the electrode position control means 14 is corrected. Next, based on the corrected electrode path, the electrode position control means 14 sets the position of the machining electrode 6, and machining proceeds by the machining electrode 6.

On the other hand, the electrode consumption measuring means 15 sends a signal to the machining power supply 9 every time the position advances X in the plane direction from the position of the machining electrode 6 set by the electrode position control means 14 to turn off the machining power supply 9. The actual electrode consumption length Δz is measured by contact detection. When the measurement is completed, the machining electrode 6 is returned to the original position and the machining power source 9 is turned on. The correction data correction means 16 calculates Δz = m ·· obtained by the correction data m stored in the correction data storage means 11. The correction data m is corrected by comparing ΔL with Δz2 actually obtained by the contact detection as described above. FIG. 63 is a flowchart showing the above operation.

  A conventional electric discharge machining apparatus for performing three-dimensional machining is configured as described above. By the way, since electric discharge machining is non-contact machining, disturbance is included and machining is not necessarily performed as expected. For example, machining powder generated during machining affects the state of the machining gap and changes the clearance.

For example, taking the rotation direction of the machining electrode 6 as an example, as shown in FIG. 64A , the machining electrode 6 is rotated in the direction of rotation while discharging the machining liquid as shown in FIG. As shown in B) , when the machining progresses while the machining liquid is involved in the rotation direction of the machining electrode 6, machining powder tends to accumulate around the machining electrode 6. Therefore, with a slight disturbance such as unstable machining and wide clearance, the predictions made before machining will be greatly deviated. Further, an error generated at a certain point also affects subsequent processing, and the error is accumulated.

In the conventional apparatus whose structure is shown in FIG. 62 , the problem of the consumption error of the machining electrode 6 is partially solved. However, it is wasteful to measure the electrode wear error for each certain section, and the shape distortion due to the error generated before the measurement is not taken into consideration. In general, three-dimensional electrical discharge machining does not proceed at a desired machining depth in a single operation, but performs so-called multi-layer machining, which is performed thinly over several layers, but the shape of the previous layer. No consideration is given to anyone.

  In addition, if the processing is as stable as possible and the processing can be performed in an ideal state, the wear error should be minimized in the first place, but such consideration is not made. In multilayer processing, no consideration is given to how the thickness of each layer is determined and how the processing conditions are switched. In addition, since machining with a simple-shaped machining electrode consumes more electrode than with a total electrode, it is necessary to replace the electrode at some timing. There were many problems, such as not being done.

  The present invention was made to solve the above-mentioned problems, and performs stable processing while maintaining a constant clearance, and prevents errors from accumulating in processing of the next layer when errors occur. To provide an electrical discharge machining device that enables high-speed and high-precision machining by performing efficient machining, processing corresponding to complex shapes, and generating a highly accurate path with short machining time It is intended.

An electric discharge machining apparatus according to claim 1 of the present invention is an electric discharge machining apparatus that performs multi-layer machining by dividing a machining area of a workpiece into a machining direction at a predetermined machining depth, and sets a predetermined electrode wear limit for each layer. Electrode consumption limit amount storage means for storing the amount, electrode consumption amount storage means for calculating and storing the electrode consumption amount for each layer by correcting the amount of electrode consumption in the machining path, and corresponding to each electrode consumption amount Electrode exchange command sending means for sending an electrode exchange command before starting the processing of the corresponding layer when the electrode wear amount exceeds the electrode wear limit amount by comparing with each electrode wear limit amount, .

According to the first aspect of the present invention, in the case of performing multi-layer processing by dividing a processing region of a workpiece at a predetermined processing depth in the processing direction, an electrode for storing a preset electrode consumption limit amount for each layer Consumption limit amount storage means, electrode consumption amount storage means for calculating and storing the electrode consumption amount for each layer by correcting the amount of electrode consumption in the machining path, and each electrode consumption limit amount corresponding to each electrode consumption amount When the electrode consumption exceeds the electrode consumption limit amount, it is equipped with an electrode exchange command sending means that sends an electrode exchange command before starting the processing of the corresponding layer, so the accuracy of each layer is maintained and high accuracy It is possible to provide an electric discharge machining apparatus capable of obtaining a machined surface.

Embodiment 1 FIG.
Embodiments of the present invention will be described below with reference to the drawings. 1 is a block diagram showing a configuration of an electric discharge machining apparatus according to Embodiment 1 of the present invention, FIG. 2 is a flowchart showing the operation of the electric discharge machining apparatus in FIG. 1, and FIG. 3 is a diagram of machining electrodes of the electric discharge machining apparatus in FIG. FIG. 4 is a diagram for explaining the relationship between the rotation direction and the position of the machining allowance, and FIG. 4 is a diagram for explaining the control of the rotation direction at a location where it is difficult to discharge the machining powder of the machining electrode of the electric discharge machining apparatus in FIG. is there.

In the figure, the conventional apparatus that are the same as those shown in FIG. 60 will be omitted with denoted by the same reference numerals. Reference numeral 18 denotes an electrode rotation direction determining means for predicting the discharge state of the machining powder with respect to the electrode path generated by the electrode path generation means 12, and determining the rotation direction of the processing electrode 6 in accordance with the discharge state. This is an electrode rotation direction control means for controlling the rotation direction of the machining electrode 6 via the electrode rotation mechanism 7 based on the rotation direction determined by the rotation direction determination means 18.

Next, the operation of the electrical discharge machining apparatus according to Embodiment 1 configured as described above will be described based on the flow shown in FIG.
First, based on the correction data stored in the correction data storage unit 11, the electrode path generation unit 12 corrects the amount of electrode consumption in the machining path stored in the machining path storage unit 10, and generates an electrode path. (Step S1). Next, the discharge state of the machining powder is predicted from the electrode path by the electrode rotation direction determining means 18, and the rotation direction of the machining electrode 6 is determined so that the machining powder is easily discharged according to this discharge state (step S2). ). For example, as shown in FIG. 3, when the machining electrode 6 is at the point A and the machining allowance is on the right side with respect to the traveling direction of the machining electrode 6, it is determined to rotate left as indicated by the arrow in the figure. The

  When the rotation direction of the machining electrode 6 is determined in this way, the electrode path is checked for each predetermined section K. Then, for example, as shown in FIG. 3, when it is confirmed that the machining electrode 6 has moved to the position of point B and the machining allowance has changed to the left with respect to the traveling direction of the machining electrode 6 (step S <b> 3), The electrode rotation direction determination means 18 sends an electrode reverse rotation command (step S4) so that the machining powder is easily discharged. Further, it is sequentially confirmed whether or not the machining powder is likely to be discharged together with the direction of the machining allowance (step S5). For example, the machining electrode 6 is located at a position where the machining powder easily collects at a recessed position as indicated by a point A in FIG. In some cases, the rotation direction is switched at appropriate times, such as 10 rotations to the right and 10 rotations to the left (step S6).

  Thus, when the electrode path is generated by the electrode path generation means 12 and the rotation direction of the machining electrode 6 is determined by the electrode rotation direction determination means 18 (step S7), the electrode path command means 13 is based on the electrode path. The electrode path command is sent, and the electrode position control means 14 moves the XY table 1 by controlling the drive motors 2 and 3 to set the position of the workpiece 4 with respect to the machining electrode 6 by this electrode path command. At the same time, the electrode rotation direction control means 19 sets the rotation direction of the machining electrode 6 via the electrode rotation mechanism 7 to machine the workpiece 4 into a predetermined shape (step S8).

  As described above, according to the first embodiment, when the machining allowance is on the left side with respect to the traveling direction of the machining electrode 6 with respect to the electrode path generated by the electrode path generating means 12, the machining electrode 6 is rotated to the right. On the other hand, when the machining allowance is on the right side, the machining electrode 6 is set to the left rotation by the electrode rotation direction determining means 18 so that the machining powder is easily discharged. Since the rotation direction of the machining electrode 6 is switched and controlled every set number of times, there is an effect that the machining state is always constant and a uniform machining surface can be obtained.

Embodiment 2. FIG.
FIG. 5 is a block diagram showing the configuration of the electric discharge machining apparatus according to Embodiment 2 of the present invention, and FIG. 6 is a flowchart showing the operation of the electric discharge machining apparatus in FIG.
In the figure, parts similar to those of the first embodiment shown in FIG. Reference numeral 20 denotes an electrode rotation number determination means for calculating the machining amount for the electrode path generated by the electrode path generation means 12, and determines the rotation number of the machining electrode 6 in proportion to the machining amount, and 21 denotes the electrode rotation number. This is an electrode rotation speed control means for controlling the rotation speed of the machining electrode 6 via the electrode rotation mechanism 7 based on the rotation speed determined by the determination means 20.

Next, the operation of the electric discharge machining apparatus according to Embodiment 2 configured as described above will be described based on the flow shown in FIG.
First, based on the correction data stored in the correction data storage unit 11, the electrode path generation unit 12 corrects the amount of electrode consumption in the machining path stored in the machining path storage unit 10, and generates an electrode path. (Step S11). Next, the machining amount is calculated for the electrode path by the electrode revolution number determining means 20, and the revolution number of the machining electrode 6 is determined in proportion to the machining amount (step S12).

  When the rotational speed of the machining electrode 6 is determined in this way, the electrode path is checked for each predetermined section K. When the change in the machining amount is confirmed (step S13), the electrode rotation speed determination means 20 sends an electrode rotation speed change command (step S14) so that the machining powder is easily discharged. Further, during the check of the electrode path, whether or not the machining powder is likely to be discharged is sequentially confirmed (step S15). If the machining electrode 6 is in a place where the machining powder is likely to accumulate, the rotational speed is set to a predetermined value Cr · p. -The speed is further increased by m (step S16).

  Thus, when the electrode path is generated by the electrode path generation means 12 and the rotation speed of the machining electrode 6 is determined by the electrode rotation speed determination means 20 (step S17), the electrode path command means 13 is based on the electrode path. The electrode path command is sent, and the electrode position control means 14 moves the XY table 1 by controlling the drive motors 2 and 3 to set the position of the workpiece 4 with respect to the machining electrode 6 by this electrode path command. At the same time, the electrode rotation speed control means 21 sets the rotation direction of the machining electrode 6 via the electrode rotation mechanism 7 to machine the workpiece 4 into a predetermined shape (step S18).

  As described above, according to the second embodiment, the machining amount is calculated by the electrode rotation number determination unit 20 for the electrode path generated by the electrode path generation unit 12, and the machining electrode 6 is proportional to the machining amount. Is set so that the machining powder can be easily discharged, and at places where it is difficult to discharge the machining powder, the rotation speed is further increased by a predetermined value Cr · p · m to discharge the machining powder. Therefore, there is an effect that the processed state is always constant and a uniform processed surface can be obtained.

Embodiment 3 FIG.
FIG. 7 is a block diagram showing the configuration of the electric discharge machining apparatus according to Embodiment 3 of the present invention, FIG. 8 is a flowchart showing the operation of the electric discharge machining apparatus in FIG. 7, and FIG. 9 shows the machining path conversion means shown in FIG. FIG. 10 is a schematic diagram showing the set route pattern, and FIG. 10 is a diagram showing a procedure for creating the lightning path pattern shown in FIG.
In the figure, the same parts as those in each of the above embodiments are denoted by the same reference numerals and description thereof is omitted. 22 is set and stored in advance in the form of rocking, meandering and lightning, and the conversion by any one of the above path patterns is continuously applied to the processing path stored in the processing path storage means 10 according to the state of the processing surface. Machining path conversion means.

Next, the operation of the electrical discharge machining apparatus according to Embodiment 3 configured as described above will be described based on the flow shown in FIG.
In general, it is effective to give the machining electrode 6 a swinging motion as shown in FIG. 9 (A) and a meandering motion as shown in FIG. 9 (C) in order to process a flat surface uniformly. Has been confirmed to be effective when the lightning movement shown in FIG. Therefore, the machining path conversion means 22 stores in advance swing, meandering and lightning-like path patterns, respectively, and the machining path conversion means 22 converts the machining path according to any of the path patterns according to the machining state. (Step S31).

  The machining path converted in this way by the machining path conversion means 22 is corrected based on the correction data stored in the correction data storage means 11 by the electrode path generation means 12, and an electrode path is generated (step S32). . When it is confirmed that the electrode path is generated by the electrode path generation means 12 (step S32), an electrode path command based on the electrode path is sent out by the electrode path command means 13, and the electrode position is determined by this electrode path command. The control means 14 controls the drive motors 2 and 3 to move the XY table 1, set the position of the workpiece 4 with respect to the machining electrode 6, and machine the workpiece 4 into a predetermined shape (step) S33).

Next, the route pattern setting method will be described with reference to FIG.
In the drawing, the solid line indicates the machining path 23 stored in the machining path storage means 10, and the broken line indicates the machining path 24 after the conversion by the machining path conversion means 22.
First, the machining path conversion means 22 divides the machining path 23 into line segments of length a as shown in the figure. Next, it is divided into right-angled isosceles triangles having a length a as a hypotenuse, and two sides sandwiching the right-angle are used as machining paths. Thereafter, by repeating the same operation, a lightning-like processing path 24 as shown in FIG. 9B is generated. In addition, although the case where the conversion by the path pattern is performed on the processing path has been described above, it goes without saying that the conversion may be performed on the electrode path.

  As described above, according to the third embodiment, the machining path conversion means 22 continuously converts the machining path according to any one of the rocking pattern, the meandering pattern, and the lightning pattern depending on the state of the machining surface. As a result, the machining state is always constant, a uniform machining surface is obtained, and the corner portion is also finished beautifully.

Embodiment 4 FIG.
FIG. 11 is a block diagram showing the configuration of the electric discharge machining apparatus according to Embodiment 4 of the present invention, and FIG. 12 is a flowchart showing the operation of the XY direction feed amount determination unit of the electric discharge machining apparatus in FIG. FIG. 13 is a cross-sectional view showing the relationship between the machining electrode and the workpiece as viewed from the direction of travel of the machining electrode, FIG. 14 is a cross-sectional view showing an example in which the machining electrode is left by moving the machining electrode by the feed amount in the XY direction, and FIG. FIG. 5 is a cross-sectional view showing an example in which a machining electrode can no longer maintain a steady state.

  In the figure, the same parts as those in each of the above embodiments are denoted by the same reference numerals and description thereof is omitted. Reference numeral 25 denotes a machining shape storage means for storing a preset desired machining shape, and 26 denotes a machining path generation means for generating a machining path based on the machining shape stored in the machining shape storage means 25. An XY-direction feed amount determination unit 26 that determines an amount smaller than the hole diameter of the machining electrode 6 and larger than the thickness of the machining electrode 6 is provided.

Next, a method of determining the feed amount of the XY direction feed amount determination unit 26 will be described with reference to FIG.
First, the hole diameter of the machining electrode is set as the XY direction feed amount (step S41). Since the machining time is shortened when the machining path is short, it is preferable that the feed amount in the XY direction is large. However, since the shape of the machining electrode 6 in the middle of machining is as shown in FIG. 13, if machining is not performed so that the portion a, that is, the hole diameter overlaps, the portion b is left unworked as shown in FIG. End up. Therefore, the XY direction feed amount needs to be at least equal to or smaller than the hole diameter of the machining electrode 6.

  Next, using the XY direction feed amount set in step S41, it is checked whether the a part overlaps in all sections of the machining path, that is, whether there is no machining residue (step S42). If it is confirmed that there is unprocessed material (step S43), the feed amount is reduced by a preset value b and the XY direction feed amount is set (step S44). Thereafter, the same operation is repeated, and the amount of feed in the XY direction is sequentially reduced until there is no remaining machining, and while the value is equal to or greater than the thickness (step S45), the machining path is determined continuously (step S46).

  If there are unprocessed parts even if the feed amount in the XY direction is less than or equal to the wall thickness of the processed electrode 6, processing is performed so that only parts where there are unprocessed parts can be processed later, although not shown in the flow in the figure. Add a route. This is because if the amount of feed in the XY direction is equal to or less than the thickness, the machining electrode 6 cannot maintain a steady state as shown in FIG.

  In this way, when the machining path is generated by the machining path generation unit 26, the electrode path generation unit 12 performs correction and generates the electrode path. Then, an electrode path command based on the electrode path is sent out by the electrode path command means 13, and the electrode position control means 14 moves the XY table 1 by controlling each of the drive motors 2 and 3 according to this electrode path command. The position of the workpiece 4 with respect to the electrode 6 is set, and the workpiece 4 is processed into a predetermined shape.

  As described above, according to the fourth embodiment, the XY direction feed amount determination unit 26a sets the XY direction feed amount to a value smaller than the hole diameter of the machining electrode and larger than the wall thickness, so that there is no remaining machining. Since the electrode 6 can maintain a steady state, there is an effect that a processed surface with high accuracy can be obtained.

Embodiment 5 FIG.
FIG. 16 is a block diagram showing the configuration of an electric discharge machining apparatus according to Embodiment 5 of the present invention, and FIG. 17 is a diagram for explaining the principle of the invention applied to Embodiment 5. In FIG.
In the figure, the same parts as those in the fourth embodiment are denoted by the same reference numerals, and the description thereof is omitted. 27 represents the consumption amount of the machining electrode 28 that is assumed to be a solid round bar having a diameter obtained by (diameter + hole diameter) / 2 of the machining electrode 6, and correction of the consumption of the electrode obtained by this calculation is corrected data. Based on the correction data stored in the storage unit 11, the electrode path generation unit generates an electrode path by applying the processing path generated by the processing path generation unit 26.

  Now, it is assumed that the cylindrical machining electrode 6 shown in FIG. 17 (A) and the solid round bar shape of the diameter obtained by (diameter + hole diameter) / 2 of the machining electrode 6 as shown in FIG. 17 (B). When comparing with the electrode 28, it is clear from the drawing that the cross-sectional areas of the consumable parts a and b are equal. Therefore, even if the consumption amount is calculated with the machining electrode 28, the same result as that when the consumption amount is calculated with the actual machining electrode 6 can be obtained, and the time required for calculating the consumption amount by the simplified shape. Therefore, workability is improved.

Embodiment 6 FIG.
18 is a block diagram showing the configuration of an electric discharge machining apparatus according to Embodiment 6 of the present invention, FIG. 19 is a flowchart showing the operation of the machining path generation means in FIG. 18, and FIG. 20 is generated along the flow shown in FIG. It is a schematic diagram which shows concretely the process path | route used as an example of a scanning process.
In the figure, the same parts as those in the fourth embodiment shown in FIG. 29 is connected in the machining area P1 continuously from the machining start point by the shortest path L, and when the path L cannot be continuously linked due to the presence of the non-machining area P2 in the middle of the path L, the non-machining area This is a machining path generation unit that generates a machining path by continuously connecting paths L while avoiding P2 in the XY direction.

Next, a machining path generation procedure in the machining path generation unit 29 will be described with reference to FIGS. 19 and 20.
First, the basic path L is created by dividing the remaining shape of the machining electrode 6 around the outline of the machining area P1 surrounded by the broken line in FIG. Step S61). Then, the route L is continuously connected at the shortest distance from the processing start point A as shown in FIG. 20B (step S62). Next, it is determined whether or not all the routes L are connected continuously (step S63). For example, when the remaining portion is confirmed as indicated by a broken line CD in FIG. 20B (step S64). Then, when the end point B of the path L is connected to one of the remaining points C at the shortest distance, it is determined whether or not the unprocessed area P2 is reached (step S65).

  Then, in the case of the non-processed area P2, the shortest path La that avoids the non-processed area P2 is created like B-C indicated by the thick solid line in FIG. 20B (step S66). On the other hand, if it is determined in step S65 that the non-processed area P2 is not applied, the direct connection is made with the shortest distance, and the process returns to step S64 to determine whether there is any leftover. Then, when all the leftovers are gone, the process proceeds to the next layer processing. Needless to say, the same process as described above is applied at the stage of transition to the next layer.

  As described above, according to the sixth embodiment, the processing electrode 6 is not lifted and jumped over the non-processing area P2 to connect the shortest distance, but the distance of the processing electrode 6 from the processing surface of the workpiece 4 is made constant. Since the non-processed region P2 is kept in the XY direction while keeping the shortest distance in the processing region P1, the processing can be performed while maintaining the processing electrode 6 in a constant shape, and the processing accuracy is improved. There is an effect that it becomes possible to make it.

Embodiment 7 FIG.
21 is a block diagram showing the configuration of the electric discharge machining apparatus according to Embodiment 7 of the present invention, FIG. 22 is a flowchart showing the operation of the electric discharge machining apparatus in FIG. 21, and FIG. 23 is the electrode wear rate, maximum peak current value, and pulse-on. It is a characteristic view which shows the relationship with time.
In the figure, the same parts as those in each of the above embodiments are denoted by the same reference numerals and description thereof is omitted. As shown in FIG. 23, 30 is a machining condition data storage means in which machining condition data for the electrode wear rate determined by the maximum peak current value and the pulse-on time is preset and stored, and 31 is a machining condition according to the change in the machining amount. This is processing condition data extraction means for extracting predetermined processing conditions from the data storage means and adding them to the electrode paths generated by the electrode path generation means 12.

Next, the operation of the electric discharge machining apparatus according to Embodiment 7 configured as described above will be described based on the flow shown in FIG.
First, based on the correction data stored in the correction data storage unit 11, the electrode path generation unit 12 corrects the amount of electrode consumption in the machining path stored in the machining path storage unit 10, and generates an electrode path. (Step S71). Next, when it is determined that there is a change in the machining amount (step S72), the machining condition data extraction unit 31 extracts a predetermined machining condition corresponding to the change in the machining amount from the machining condition data storage unit 31 (step S73). .

  Now, assuming that the machining amount is a, the electrode consumption rate is b, and the electrode consumption amount in the depth direction is c, a · b = k · c (where k is a coefficient). Therefore, in order to make the electrode consumption amount c constant, the electrode consumption rate b may be obtained so as to have an inversely proportional relationship with the machining amount a. Therefore, for example, if the processing condition at point A in FIG. 23 is a reference processing amount for a certain electrode, when the processing amount changes and becomes half, the processing condition at point B may be extracted, for example.

  In this way, when the desired machining conditions are extracted in step S73, the machining conditions are added to the electrode path generated by the electrode path generation means 12 (step S74). Then, an electrode path command based on the electrode path to which the machining conditions are added is sent out by the electrode path command means 13, and the electrode position control means 14 controls the drive motors 2 and 3 by this electrode path command to thereby control the XY table. 1 is moved, the position of the workpiece 4 with respect to the machining electrode 6 is set, and the workpiece 4 is machined into a predetermined shape (step S75).

  As described above, according to the seventh embodiment, the machining condition data extraction unit 31 extracts the machining condition according to the change in the machining amount, and adds the machining condition to the electrode path generated by the electrode path generation unit 12. By doing so, the consumption amount of the machining electrode 6 is always kept constant, so that there is an effect that a uniform machining surface can be obtained.

Embodiment 8 FIG.
FIG. 24 is a block diagram showing the configuration of the electric discharge machining apparatus according to Embodiment 8 of the present invention, and FIG. 25 is a flowchart showing the operation of the electric discharge machining apparatus in FIG.
In the figure, the same parts as those in each of the above embodiments are denoted by the same reference numerals and description thereof is omitted. 32 detects the position and the number of rotations of the machining electrode 6 by detecting the movements of the drive motors 2 and 3 and the electrode rotation mechanism 7, and detects the degree of machining powder generation at that time to recognize the machining state. State recognition means 33 is an electrode rotation speed command means for determining and instructing the rotation speed of the machining electrode 6 according to the degree of machining state recognized by the machining state recognition means 32, and 34 is recognized by the machining state recognition means 32. When the degree of the processed state exceeds a preset threshold value A, it is an electrode rotation speed control means for controlling the rotation speed of the machining electrode 6 to be increased by Cr · p · m for B seconds, for example.

Next, the operation of the electrical discharge machining apparatus according to Embodiment 8 configured as described above will be described based on the flow shown in FIG.
First, based on the correction data stored in the correction data storage unit 11, the electrode path generation unit 12 corrects the amount of electrode consumption in the machining path stored in the machining path storage unit 10, and generates an electrode path. (Step S81). Next, an electrode path command based on the electrode path generated by the electrode path command means 13 is sent, and the electrode position control means 14 moves the XY table 1 by controlling the drive motors 2 and 3 by this electrode path command. The position of the workpiece 4 with respect to the machining electrode 6 is set, and the electrode rotation speed control means 19 sets the rotation speed of the machining electrode 6 via the electrode rotation mechanism 7 and starts machining.

  On the other hand, when the machining is started, the machining state recognition means 32 detects the position and the number of rotations of the machining electrode 6 by detecting the movements of the drive motors 2 and 3 and the electrode rotation mechanism 7, and in that state. A processing state is recognized by detecting the generation degree of the processing powder (step S82). Next, the rotation speed according to the machining state is determined by the electrode rotation speed command means 33 and is commanded to the electrode rotation speed control means 34. When the degree of machining state recognized by this command exceeds the preset threshold value A in the electrode rotation speed control means 34, for example, the current rotation speed of the machining electrode 6 is set to a predetermined value for B seconds. By increasing the value Cr · p · m (step S83), the machining state is improved and the machining is continued.

In the above configuration, when the degree of the machining state exceeds the threshold value A, the number of revolutions of the machining electrode 6 is increased by Cr · p · m for B seconds. However, the degree of the machining state is the threshold. The rotational speed may be continuously increased by Cr · p · m until the value returns to A or less.
Also, an electrode rotation direction command means is provided instead of the electrode rotation number command means 33. For example, if the rotation direction is reversed and the machining state does not improve even after a predetermined time, the rotation direction is set to 10 turns to the right and left to the left. Needless to say, the rotation direction may be alternately changed every appropriate number of times, such as 10 rotations.

  As described above, according to the eighth embodiment, the machining state recognition unit 32 recognizes the machining state, and the electrode rotation number control unit 34 sets the current rotation number to a predetermined value Cr · p · m according to the degree of the machining state. By adding it, the machining state is improved and the machining is continued, so that there is an effect that machining can always be performed in a stable machining state and a uniform machining surface can be obtained.

Ninth Embodiment
26 is a block diagram showing the configuration of the electric discharge machining apparatus according to Embodiment 9 of the present invention, FIG. 27 is a flowchart showing the operation of the electric discharge machining apparatus in FIG. 26 , and FIG. 28 is stored in the machining condition data storage means in FIG. FIG . 29 is a characteristic curve diagram showing the relationship between the processing depth and the processing speed, and FIG . 30 is a diagram showing the determined processing conditions for each layer.

In the figure, the same parts as those in each of the above embodiments are denoted by the same reference numerals and description thereof is omitted. 49 is a machining shape storage unit that stores a desired final machining shape, and 50 is a machining condition data storage in which data such as the maximum current value, ideal machining depth or machining speed for the electrode shape is stored as shown in FIG. Means 51, machining condition determination means for determining machining conditions based on the data stored in the machining condition data storage means 50, and 52 divides the layer using each data stored in the machining condition data storage means 50. It is a machining path generation means that performs the machining path based on the machining conditions determined by the machining condition determination means 51.

Next, based on the flow shown in FIG. 27 , the operation of the electric discharge machining apparatus according to the ninth embodiment configured as described above is performed with 10 cm 3 of pocket machining with a machining electrode 6 having an electrode diameter of 10 mm with a final surface roughness of 10 μm. A case will be described as an example.
First, the thickness of the start and middle layers, that is, the main layer is determined to be 1 mm (step S131). In this case, it is not a good idea to suddenly process 1 cm in the starting layer. That is, electrode consumption determined by the amount of processing is not realistic and is not stable by deep processing. Then, if one layer is made very thin, for example, 0.1 mm, the amount of machining is remarkably reduced, so that the electrode servo does not work well or the machining electrode 6 works wastefully without actually machining, so it is not always optimal. High speed machining is not performed.

That is, if the amount of machining and the machining conditions are determined, the machining speed should be determined almost uniquely. Actually, however, the machining depth and the machining speed have a relationship as shown in FIG. 28 with respect to the electrode diameter and the machining conditions. As shown in the figure, in the case of an electrode diameter of 10 mm, the maximum processing speed is 1.5 g / min when the processing current is 100 A, the surface roughness is 110 μm, and the processing depth is 1 mm. That is, forming the main layer so as to satisfy this condition as much as possible is the fastest processing, so it is efficient to set the processing depth to 1 mm.

  Next, the final layer thickness is determined (step S132). The final layer should have a thickness of 100 μm because it is better to take an amount of 10 times or less the final surface roughness in order to absorb errors. Subsequently, after determining the processing conditions of the main layer (step S133), it is confirmed that the surface roughness of the main layer is larger than the thickness of the final layer (step S134), and the final pre-stage layer immediately before the final layer is checked. The thickness is determined (step S135). Since the final layer has a thickness of 100 μm, if the final front layer has a surface roughness of 110 μm, the final front layer may have a surface roughness on the final surface. That is, it is necessary to use the condition of surface roughness finer than the surface roughness of the layer formed immediately before the thickness of one layer.

From FIG. 28 , for example, assuming that the condition of the surface roughness equal to the thickness of the final layer is the condition of the final pre-stage layer, the processing condition of the processing current 90A satisfies the condition here. processing conditions are determined as shown in FIG. 30. Based on the machining conditions, the machining path generation unit 52 generates a machining path. The correction data stored in the correction data storage unit 11 is added to the machining path, and the electrode path generation unit 12 generates the electrode path. (Step S136). Thereafter, as in the case of each of the above embodiments, the electrode path command means 13 sends an electrode path command based on the electrode path, and the electrode position control means 14 controls the drive motors 2 and 3 by this electrode path command. As a result, the XY table 1 is moved, the position of the workpiece 4 with respect to the machining electrode 6 is set, and the workpiece 4 is machined into a predetermined shape (step S137).

As described above, according to the ninth embodiment, the machining electrode 6 has a maximum machining speed corresponding to the diameter of the machining electrode 6 and a machining condition including the maximum machining current, and a predetermined machining depth corresponding to the maximum machining speed. Also, the processing depth of the final layer should be 10 times or less than the required surface roughness of the workpiece, and the depth of each layer should be processed more than the surface roughness of the layer formed immediately before. Therefore, there is an effect that multi-layer processing with high accuracy is possible in a short time.

Embodiment 10 FIG.
FIG. 31 is a block diagram showing a configuration of an electric discharge machining apparatus according to Embodiment 10 of the present invention, FIG. 32 is a flowchart showing the operation of the electric discharge machining apparatus in FIG. 31 , and FIG. 33 schematically shows a tapered machining shape. FIG . 34 and FIG. 34 are views showing the inclination data stored in the inclination data storage means in FIG.
In the figure, the same parts as those in each of the above embodiments are denoted by the same reference numerals and description thereof is omitted. Reference numeral 53 denotes an inclination data storage means storing inclination data as shown in FIG. 34 , and 54 denotes a machining shape stored in the machining shape storage means 49 based on the inclination data stored in the inclination data storage means 53 . Reference numeral 33 denotes a taper portion multilayer dividing means for determining and dividing the thickness of each layer, and 55 denotes a processing path generating means for generating a processing path for each layer divided by the taper portion multilayer dividing means 54.

Next, the operation of the electric discharge machining apparatus according to Embodiment 10 configured as described above will be described based on the flow shown in FIG .
First, the thickness of each layer is obtained by the taper multilayer dividing means 54 based on the inclination data shown in FIG. 34 stored in the inclination data storage means 53 (step S141). Next, as shown in FIG. 33 , multi-layer division is performed with the thickness obtained in step S141 (step S142).
Hereinafter, although not shown in the flow, the machining path for each layer divided by the machining path generation unit 55 is generated, and then the correction data stored in the correction data storage unit 11 is processed into the processing path by the electrode path generation unit 12. Based on the correction, an electrode path is generated.

As described above, according to the tenth embodiment, the thickness of the layer corresponding to each inclination angle is set in the inclination data storage means 53 in advance, and the processing region is set to the inclination angle set by the taper multilayer dividing means 54. Since it divides | segments by the thickness of the layer according to, the process area | region which has an inclination in an outline part can be processed accurately.

Embodiment 11 FIG.
35 is a block diagram showing the configuration of the electrical discharge machining apparatus according to Embodiment 11 of the present invention, FIG. 36 is a flowchart showing the operation of the machining path generation means in FIG. 35 , and FIG. 37 is machining in the second and subsequent layers in FIG. 38 is a flowchart showing details of route generation, and FIG. 38 is a flowchart showing an identification mode when determining deletion or addition of a path in FIG.
In the figure, the same parts as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 56 denotes machining path generation means for generating a machining path by deleting or adding a path for each layer divided by the taper multilayer dividing means 54.

Next, a machining path generation step of the machining path generation unit in the eleventh embodiment configured as described above will be described.
First, as shown in FIG. 36 , a processing path for the first layer is generated (step S151a). FIG. 39 shows the machining path generated in this way, and the first path P1 is generated for the first target shape. The second path P2 is generated inward by a distance L considering the region processed by the first path P1. Thereafter, the third and fourth paths P3 and P4 are generated in the same manner, and the first layer processing path is generated.

Next, machining paths for the second and subsequent layers are generated (step S152a). First, as shown in FIG. 37, it is determined whether or not it is necessary to delete a path for the same machining path as the first-layer machining path (step S151b). If necessary, the path is deleted (step S152b). Further, it is determined whether a path needs to be added to the machining path from which the path has been deleted (step S153b). If necessary, the path is added (step S154b), and a desired machining path for the target machining layer is determined. obtain.

Hereinafter , deletion and addition of paths in the flow shown in FIG. 37 will be described in detail with reference to FIG .
First, a distance (hereinafter referred to as a layer width W) at which the shape changes as the processed layer advances by one step is calculated (step S151c). As shown in FIG. 40 , the layer width W is obtained by W = t × tan (2πr / 360) where t is the thickness of each layer and α is the inclination angle. Next, the layer width W is compared with the inter-path distance L (step S152c). When the layer width W and the inter-path distance L are equal, the mode 1 is set (step S153c), and when the layer width W is smaller, the mode 2 is set. If the layer width W is larger (step S154c), the mode 3 (step S155c) is entered.

Next, machining path generation when the identification mode is mode 1 will be described.
41 , P1 indicates the first path, P2 indicates the second path, P3 indicates the third path, N1 indicates the first layer processing area, and N2 indicates the second layer processing area. N3 represents the processing region of the third layer.
First, as shown in FIG. 41 , a machining path is generated for the first-layer machining area N1. Next, a machining path for the second layer machining area N2 is obtained. As is apparent from the figure, the processing region N2 of the second layer has a shape that is inward of the processing region N1 of the first layer by the layer width W, and the layer width W is equal to the distance L between the paths. It is determined that the first path P1 of the layer should be deleted, and P2 is taken as the first path and P3 is taken as the second path, and a machining path for the machining area N2 of the second layer is generated. In the same manner, the machining paths for the third and subsequent machining areas are generated in the same manner.
FIG. 42 shows a part of the processing path of each layer generated as described above.

Next, machining path generation when the identification mode is mode 2 will be described.
In the figure, the same parts as those in FIG. 41 will be omitted with denoted by the same reference numerals.
First, as shown in FIG. 43 , a machining path is generated for the first-layer machining area N1. Next, a machining path for the second layer machining area N2 is obtained. As is apparent from the figure, the processing region N2 of the second layer has a shape that is inward by the layer width W from the processing region N1 of the first layer, and the layer width W is smaller than the distance L between the paths. It is determined that the first path P1 in the first layer should be deleted, and P2 is taken as the first path and P3 is taken as the second path. However, since the layer width W is smaller than the inter-path distance L as it is, the region corresponding to the deviation L1 resulting from the difference cannot be processed. Therefore, a path P21 for processing the contour of the processing area N2 of the second layer is added, this P21 is taken as the first path, P2 is taken as the second path, and P3 is taken as the third path. A machining path for the machining area N2 is generated.

Similarly, a machining path for the third layer machining area N3 is obtained. The third layer processed region N3 has a shape that is further inward by the layer width W than the second layer processed region N2, and the layer width W is smaller than the inter-path distance L, so the first pass of the first layer It is determined that P1 and the second path P2 should be deleted, and P3 is taken as the first path. However, the region for the deviation L2 cannot be processed for the same reason as in the case of the second layer. Therefore, a path P31 for machining the contour of the third layer machining area N3 is added, and P31 is taken as the first path and P3 is taken as the second path to create a machining path for the third layer machining area N3. Is done. In the same manner, machining paths for the fourth and subsequent machining areas are generated in the same manner. A part of the processing path of each layer generated as described above is shown in FIG .

Finally, machining path generation when the identification mode is mode 3 will be described.
In the figure, the same parts as those in the modes 1 and 2 are given the same reference numerals, and the description thereof is omitted.
First, as shown in FIG. 41 , a machining path is generated for the first-layer machining area N1. Next, a machining path for the second layer machining area N2 is obtained. As is apparent from the figure, the processing region N2 of the second layer has a shape that is inward of the processing region N1 of the first layer by the layer width W, and the layer width W is larger than the inter-path distance L. It is determined that the first path P1 and the second path P2 in the layer should be deleted, and P3 is taken as the first path. However, since the layer width W is larger than the inter-path distance L, the region for the deviation L11 resulting from the difference cannot be processed. Therefore, a path P22 for processing the contour of the processing area N2 of the second layer is added, this P22 is taken as the first path, P3 is taken as the second path, and P4 is taken as the third path. A machining path for the machining area N2 is generated.

  Similarly, a machining path for the third layer machining area N3 is obtained. The third layer processing region N3 has a shape that is further inward than the second layer processing region N2 by the layer width W. Since the layer width W is greater than the inter-path distance L, the first path P1 of the first layer It is determined that the second path P2 and the third path P3 should be deleted, and P4 is taken as the first path. However, the region of the deviation L12 cannot be processed for the same reason as in the case of the second layer. Therefore, a path P32 for processing the contour of the third layer processing area N3 is added, and a processing path for the third processing area N3 is generated by taking P32 as the first path and P4 as the second path. Is done. In the same manner, machining paths for the fourth and subsequent machining areas are generated in the same manner. FIG. 46 shows a part of the processing path of each layer generated as described above.

  In the above description, the identification mode is divided into three patterns of modes 1 to 3. However, the present invention is not limited to this. In short, a part of the path is deleted from the first layer processing path or a part of the path is deleted. Needless to say, any processing path that is deleted and a new path that compensates for the processing residue is added to generate processing paths for the second and subsequent layers.

As described above, according to the eleventh embodiment, the machining path generation unit 56 deletes a part of the path from the first-layer machining path, or deletes a part of the path and adds a new path that compensates for the machining residue. Thus, since the machining paths for the second and subsequent layers are generated, there is no need to calculate the machining paths for each layer, and the machining paths can be generated efficiently.

Embodiment 12 FIG.
47 is a block diagram showing a configuration of an electric discharge machining apparatus according to Embodiment 12 of the present invention, FIG. 48 schematically shows a tapered machining shape, and FIG. 49 schematically shows a state in which the machining shape in FIG. 48 is separated . It is a figure shown.
In the figure, the same parts as those in each of the above embodiments are denoted by the same reference numerals and description thereof is omitted. As shown in FIG. 48 , 57 is an inclined part separating means for separating the contour part a from the other part b as shown in FIG. 49 , and 58 is separated by the inclined part separating means 57 as shown in FIG. An inclined portion multi-layer dividing means 59 for dividing the contoured portion a into multiple layers based on the data stored in the inclined data storing means 53, 59 is divided into the contour portion a and the other portion b separated by the inclined portion separating means 57. The machining path generation means generates different machining paths by taking into account the machining conditions determined by the machining condition determination means 51.

Next, the operation of the electric discharge machining apparatus according to Embodiment 12 configured as described above will be described.
When processing a processing region having an inclination in the contour portion, first, the contour portion a is separated from other portions by the inclined portion separating means 57 as shown in FIG . At this time, when the machining electrode 6 is cylindrical, the thickness of the contour portion a indicated by t in FIG. 48 is set larger than the electrode thickness. This is to prevent the electrode shape from being deformed during processing.

Next, for the contour portion a, the thickness of each layer is determined by the inclined portion multilayer dividing means 58 based on the inclination data stored in the inclination data storage means 53, as in the case of the tenth embodiment, and the machining path generation means. 59, the processing path of each layer is generated. Note that the contour portion a having an inclination needs to be set as thin as possible so that no electrode trace remains. However, if the other portion b is also made thin in accordance with the contour portion a, the processing time becomes enormous. Each layer is divided with a large thickness.

As described above, according to the twelfth embodiment, the machining area is divided into the contour portion a having an inclination and the other portion b, and only the layer of the contour portion a is thinned. In addition, since the thickness t of the contour portion a is greater than or equal to the thickness of the electrode, it is possible to obtain an effect such that high-precision processing can be performed while keeping the electrode shape constant.

Embodiment 13 FIG.
50 is a block diagram showing a configuration of an electric discharge machining apparatus according to Embodiment 13 of the present invention, and FIG. 51 is a flowchart showing an operation of the electric discharge machining apparatus in FIG.
In the figure, the same parts as those in each of the above embodiments are denoted by the same reference numerals and description thereof is omitted. Reference numeral 60 denotes an electrode consumption amount storage means in which data obtained by correcting the electrode consumption amount by the electrode path generation means 12 is stored; 61, an electrode number storage means in which data of the necessary number of electrodes is stored; and 62, a preset electrode exchange The electrode consumption limit amount storage means for storing the electrode consumption limit amount data of 63, 63 compares the data stored in the electrode consumption limit storage means 60 with the data stored in the electrode consumption limit amount storage means 62, When the electrode consumption amount exceeds the consumption limit amount, the electrode exchange command sending means for sending an electrode exchange command extracts the necessary number of electrodes from the electrode number storage means 61 and displays it on a CRT (not shown), for example.

Next, the operation of the electric discharge machining apparatus according to the thirteenth embodiment configured as described above will be described with reference to FIG .
First, based on the correction data stored in the correction data storage unit 11, the electrode path generation unit 12 corrects the amount of electrode consumption in the machining path stored in the machining path storage unit 10, and generates an electrode path. (Step S171). The electrode consumption amount corrected in this way is stored in the electrode consumption amount storage means 60 (step S172). Next, the electrode consumption amount stored in the electrode consumption amount storage means 60 is compared with the consumption limit amount preset and stored in the electrode consumption limit amount storage means 62 by the electrode replacement command sending means 63 (step S173). When the consumption amount exceeds the consumption limit amount, an electrode replacement command is sent (step S174), and the necessary number of electrodes is extracted from the electrode number storage means 61 and displayed on a CRT (not shown) (step S175).

As described above, according to the thirteenth embodiment, when the electrode wear amount of the machining electrode 6 exceeds the wear limit amount, the electrode exchange command is sent from the electrode exchange command sending means 63 and the necessary number of electrodes is displayed. Therefore, there is an effect that the electrode can be easily replaced and workability can be improved.

Embodiment 14 FIG.
52 is a block diagram showing a configuration of an electric discharge machining apparatus according to Embodiment 14 of the present invention, and FIG. 53 is a flowchart showing an operation of the electric discharge machining apparatus in FIG.
In the figure, the same parts as those in each of the above embodiments are denoted by the same reference numerals and description thereof is omitted. Reference numeral 64 denotes an electrode consumption amount storage means for sequentially storing data corrected for the electrode consumption amount by the electrode path generation means 12 for each layer. Reference numeral 65 denotes an electrode consumption amount for each layer stored in the electrode consumption amount storage means 64, and an electrode. The electrode replacement is performed by comparing the consumption limit amount stored in the consumption limit amount storage means 62 in advance and, if it is determined that the electrode consumption amount exceeds the consumption limit amount, an electrode replacement command is sent before starting the processing of the corresponding layer. Command sending means.

Next, the operation of the electric discharge machining apparatus according to the fourteenth embodiment configured as described above will be described with reference to FIG .
First, based on the correction data stored in the correction data storage unit 11, the electrode path generation unit 12 corrects the amount of electrode consumption in the machining path stored in the machining path storage unit 10, and generates an electrode path. (Step S181). The corrected electrode consumption amount is calculated for each layer and stored in the electrode consumption amount storage means 64 (step S182).

Next, the electrode consumption amount stored for each layer stored in the electrode consumption amount storage means 64 is compared with the consumption limit amount preset by the electrode consumption limit amount storage means 62 and stored for each layer by the electrode replacement command sending means 65. If it is determined that the electrode consumption amount exceeds the consumption limit amount (step S183), an electrode replacement command is sent before the processing of the corresponding layer is started (step S184). Although not shown in the flow of FIG. 53 , if the sent electrode exchange command is displayed on the CRT or the like, the workability is further improved.

As described above, according to the fourteenth embodiment, when the electrode replacement command sending means 65 compares the electrode wear amount and the wear limit amount for each layer in advance, and it is determined that the electrode wear amount exceeds the wear limit amount, Since the electrode exchange command is sent before the processing of the corresponding layer is started, not only the workability is improved, but also the accuracy of each layer is maintained, and as a result, a highly accurate processed surface can be obtained. .

Embodiment 15 FIG.
54 is a block diagram showing the configuration of the electric discharge machining apparatus according to Embodiment 15 of the present invention, and FIG. 55 is a flowchart showing the operation of the electric discharge machining apparatus in FIG.
In the figure, the same parts as those in each of the above embodiments are denoted by the same reference numerals and description thereof is omitted. Reference numeral 66 denotes a machining program storage unit that stores machining programs for other machine tools, and 67 denotes a machining path extraction unit that extracts a desired machining path from the machining programs stored in the machining program storage unit 66.

Next, the operation of the electrical discharge machining apparatus according to Embodiment 15 configured as described above will be described with reference to FIG .
First, one block is extracted from the machining program stored in the machining program storage means 66 (step S191). Usually, the machining program of the machine tool is written using the NC code, as shown in FIG. 56 (A). Next, only those that are machining codes or movement codes are discriminated from the extracted blocks (step S192), and unnecessary portions obtained by drawing underlines in FIG. 56 (A) , for example, are deleted, and FIG. A desired machining path is extracted as shown in (B) (step S193).

When a desired machining path is extracted in this way, the electrode path generation unit 12 performs correction based on the correction data in the correction data storage unit 11 to generate an electrode path (step S194).
Thereafter, in the same manner as in each of the above embodiments, the electrode path command means 13 sends an electrode path command based on the electrode path, and the electrode position control means 14 controls the drive motors 2 and 3 by this electrode path command. Thus, the XY table 1 is moved, the position of the workpiece 4 with respect to the machining electrode 6 is set, and the workpiece 4 is machined into a predetermined shape (step S195).

As described above, according to the fifteenth embodiment, since a machining path is generated using a machining program of another machine tool or the like, there is an effect that the apparatus can be simplified and cost can be reduced.

Embodiment 16 FIG.
57 is a block diagram showing the configuration of the electric discharge machining apparatus according to Embodiment 16 of the present invention, FIG. 58 is a flowchart showing the operation of the electric discharge machining apparatus in FIG. 57 , and FIG. 59 is a schematic diagram showing the concept until the machining path is generated. It is.
In the figure, the same parts as those in each of the above embodiments are denoted by the same reference numerals and description thereof is omitted. 68 is a multilayer dividing means for dividing the machining shape stored in the machining shape storage means 49 into multiple layers, and 69 is for each layer divided by the multilayer dividing means 68 with respect to the traveling direction of the machining path of the previous layer. This is a machining path generation means for generating a machining path so as to form a right angle.

Next, the operation of the electric discharge machining apparatus according to the sixteenth embodiment configured as described above will be described with reference to FIG .
First, the machining shape as shown in FIG. 59 (A) stored in the machining shape storage means 49 by the multilayer division means 68 is divided into, for example, A, B, C, and D multilayers as shown in FIG. 59 (B). (Step S201). Next, the processing path generation means 69 makes each layer perpendicular to the traveling direction of the processing path of the previous layer, that is, the A and C layers are indicated by arrows a in FIG. 59 (C). Similarly, for each of the B and D layers, a processing path for each layer is generated as indicated by an arrow b in FIG . 59D (step S202).

When the machining paths for each layer are generated in this way, the electrode path generation unit 12 performs correction based on the correction data in the correction data storage unit 11, and generates an electrode path (step S203).
Thereafter, in the same manner as in each of the above embodiments, the electrode path command means 13 sends an electrode path command based on the electrode path, and the electrode position control means 14 controls the drive motors 2 and 3 by this electrode path command. Thus, the XY table 1 is moved, the position of the workpiece 4 with respect to the machining electrode 6 is set, and the workpiece 4 is machined into a predetermined shape (step S204).

As described above, according to the sixteenth embodiment, for each layer obtained by dividing the machining shape into multiple layers, the machining path is generated so as to be perpendicular to the traveling direction of the machining path of the previous layer. Since the processing proceeds while erasing the processing trace generated in the previous layer in the processing path, there is an effect that a uniform processing surface can be obtained.

It is a block diagram which shows the structure of the electric discharge machining apparatus in Embodiment 1 of this invention. It is a flowchart which shows operation | movement of the electric discharge machining apparatus in FIG. It is a figure for demonstrating the relationship between the rotation direction of the machining electrode of the electric discharge machining apparatus in FIG. 1, and the position of a machining allowance. It is a figure for demonstrating control of the rotation direction in the location where discharge | emission of the process powder of the process electrode of the electric discharge machining apparatus in FIG. 1 is difficult. It is a block diagram which shows the structure of the electric discharge machining apparatus in Embodiment 2 of this invention. It is a flowchart which shows operation | movement of the electric discharge machining apparatus in FIG. It is a block diagram which shows the structure of the electric discharge machining apparatus in Embodiment 3 of this invention. It is a flowchart which shows operation | movement of the electric discharge machining apparatus in FIG. It is a schematic diagram which shows the path | route pattern preset to the process path | route conversion means shown in FIG. It is a figure which shows the preparation procedure of the lightning-like path | route pattern shown in FIG. It is a block diagram which shows the structure of the electric discharge machining apparatus in Embodiment 4 of this invention. It is a flowchart which shows operation | movement of the XY direction sending amount determination part of the electric discharge machining apparatus in FIG. It is sectional drawing which shows the relationship between the processing electrode seen from the advancing direction of a processing electrode, and a to-be-processed object. It is sectional drawing which shows the example which moves a process electrode by XY direction sending amount, and a process left part comes out. It is sectional drawing which shows the example in which the process electrode became unable to hold | maintain a steady state. It is a block diagram which shows the structure of the electric discharge machining apparatus in Embodiment 5 of this invention. It is a figure for demonstrating the principle of the invention applied to Embodiment 5. FIG. It is a block diagram which shows the structure of the electric discharge machining apparatus in Embodiment 6 of this invention. It is a flowchart which shows operation | movement of the process path | route production | generation means of the electrical discharge machining apparatus in FIG. FIG. 20 is a schematic diagram specifically illustrating a processing path generated along the flow illustrated in FIG. 19 using scan processing as an example. It is a block diagram which shows the structure of the electric discharge machining apparatus in Embodiment 7 of this invention. It is a flowchart which shows operation | movement of the electric discharge machining apparatus in FIG. It is a characteristic view which shows the relationship between an electrode consumption rate, a maximum peak current value, and a pulse on time. It is a block diagram which shows the structure of the electric discharge machining apparatus in Embodiment 8 of this invention. It is a flowchart which shows operation | movement of the electric discharge machining apparatus in FIG. It is a block diagram which shows the structure of the electric discharge machining apparatus in Embodiment 9 of this invention. It is a flowchart which shows operation | movement of the electric discharge machining apparatus in FIG. It is a figure which shows an example of the process condition data stored in the process condition data storage means in FIG. It is a characteristic curve figure showing the relation between processing depth and processing speed. It is a figure which shows the processing conditions for every determined layer. It is a block diagram which shows the structure of the electric discharge machining apparatus in Embodiment 10 of this invention. FIG. 32 is a flowchart showing the operation of the electric discharge machine in FIG. 31. It is a figure which shows a taper-like processed shape typically. It is a figure which shows the inclination data stored in the inclination data storage means in FIG. It is a block diagram which shows the structure of the electric discharge machining apparatus in Embodiment 11 of this invention. It is a flowchart which shows operation | movement of the process path | route production | generation means of the electric discharge machine in FIG. It is a figure which shows the detail of the process path | route production | generation after the 2nd layer in FIG. It is a flowchart which shows the identification mode at the time of determining deletion or addition of the path | pass in FIG. It is a figure which shows typically the example of the process path | route of the 1st layer produced | generated by step S151a in FIG. It is a figure which shows the relationship between layer width W, layer thickness t, and inclination | tilt angle (alpha). It is a schematic diagram for demonstrating the process path | route production | generation means in case identification mode is mode 1. FIG. It is a schematic diagram which shows a part of process path | route of each layer produced | generated by the procedure shown in FIG. It is a schematic diagram for demonstrating the process path | route production | generation means in case identification mode is mode 2. FIG. It is a schematic diagram for demonstrating the process path | route production | generation means in case identification mode is mode 3. FIG. It is a schematic diagram which shows a part of processing path | route of each layer produced | generated in the procedure shown in FIG. It is a schematic diagram which shows a part of processing path | route of each layer produced | generated by the procedure shown in FIG. It is a block diagram which shows the structure of the electric discharge machining apparatus in Embodiment 12 of this invention. It is a figure which shows a taper-like processed shape typically. It is a figure which shows typically the state which isolate | separated the processing shape in FIG. It is a block diagram which shows the structure of the electric discharge machining apparatus in Embodiment 13 of this invention. It is a flowchart which shows operation | movement of the electric discharge machining apparatus in FIG. It is a block diagram which shows the structure of the electric discharge machining apparatus in Embodiment 14 of this invention. FIG. 53 is a flowchart showing the operation of the electric discharge machining apparatus in FIG. 52. It is a block diagram which shows the structure of the electric discharge machining apparatus in Embodiment 15 of this invention. It is a flowchart which shows operation | movement of the electric discharge machining apparatus in FIG. It is a figure which shows an example of a process program. It is a block diagram which shows the structure of the electric discharge machining apparatus in Embodiment 16 of this invention. FIG. 58 is a flowchart showing the operation of the electric discharge machining apparatus in FIG. 57. It is a schematic diagram showing the concept until a process path | route production | generation. It is a block diagram which shows the structure of the conventional electric discharge machining apparatus. FIG. 61 is a flowchart showing operations of main parts of the electric discharge machining apparatus in FIG. 60. FIG. 61 is a block diagram showing a configuration of another conventional electric discharge machining apparatus different from that shown in FIG. 60. FIG. 63 is a flowchart showing operations of main parts of the electric discharge machining apparatus in FIG. 62. It is a figure for demonstrating that the discharge degree of a process liquid changes with the relationship between the rotation direction of a process electrode, and the position of a process allowance.

Explanation of symbols

1 XY table, 2, 3, 8 drive motor, 4 workpiece, 5 spindle,
6 machining electrodes, 7 electrode rotation mechanisms, 9, 28 machining electrodes, 10 machining path storage means,
11 correction data storage means, 12, 27 electrode path generation means, 13 electrode path command means,
14 electrode position control means, 18 electrode rotation direction determination means, 19 electrode rotation direction control means,
20 electrode rotation speed determining means, 21, 34 electrode rotation speed control means,
22 machining path conversion means, 23, 24 machining path, 25, 49 machining shape storage means,
26, 29, 52, 55, 56, 59, 69 Machining path generation means,
30, 50 machining condition data storage means, 31 machining condition data extraction means,
32 machining state recognition means, 33 electrode rotation speed command means , 51 machining condition determination means,
53 Inclination data storage means, 54 Taper portion multilayer division means, 57 Inclination portion separation means,
58 inclined section multilayer dividing means, 60, 64 electrode consumption amount storing means,
61 electrode number storage means, 62 electrode consumption limit amount storage means,
63, 65 Electrode replacement command sending means, 66 machining program storage means,
67 processing path extracting means, 68 multilayer dividing means.

Claims (1)

In an electric discharge machining apparatus that divides a machining area of a workpiece into a machining direction at a predetermined machining depth and performs multi-layer machining, an electrode wear limit storage unit that stores a preset electrode wear limit for each layer, and machining Comparing the electrode consumption amount storage means for calculating and storing the electrode consumption amount for each layer by correcting the amount of consumption of the electrode in the path, and comparing each electrode consumption amount and the corresponding electrode consumption limit amount. An electric discharge machining apparatus comprising: an electrode exchange command sending means for sending an electrode exchange command before starting processing of a corresponding layer when the electrode wear amount exceeds the electrode wear limit amount.

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