JPH0825147A - Electric discharge machining device - Google Patents

Abstract

PURPOSE:To eliminate necessity for producing a correction electrode track data considering electrode consumption, by providing an electrode consumption compensating means performing a consumption compensating operation in an electrode lengthwise direction in accordance with an electrode consumption correction length in each detecting discharge generation. CONSTITUTION:In a unit consumption correction length calculating means 11, a unit electrode consumption correction length per discharge 1 pulse DELTAz=k/S is calculated from unit consumption correction volume (k) and an electrode lengthwise direction projection area S corresponding to a machining condition in use. In an electrode consumption correction length integrating means 12, the unit electrode consumption correction length DELTAz, calculated in each detecting generation of a discharge pulse, is integrated and stored as a total electrode consumption correction length Zs. In an electrode lengthwise direction position adding means 13, of electrode track data 5, to an electrode track data 5 relating to the data in the electrode lengthwise direction, the total electrode consumption correction length Zs is added to generate an output. Next in a control device 4, in accordance with the output of the electrode lengthwise direction position adding means 13, an electrode 1 is moved to perform machining.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locus scanning type electric discharge machining apparatus for machining a work piece into a desired shape by scanning electrodes along a predetermined locus.

[0002]

2. Description of the Related Art Conventionally, an electric discharge machining method in which an electrode having a relatively simple shape such as a cylinder, a cylinder, and a prism is scanned along a predetermined trajectory to perform electric discharge machining of a workpiece to a desired three-dimensional shape. And devices (hereinafter referred to as simple electrode electrical discharge machining) are known. In this simple electrode electric discharge machining, it is not necessary to design or manufacture a complicated three-dimensional shape electrode, so the machining cost can be reduced, and the machining waste can be easily removed from the machining gap to achieve stable machining. Since it is easy to do, no skill is required for electric discharge machining, and since the electrode shape can be standardized, compatibility with the CAM system is good and automatic machining can be easily realized. However, in electrical discharge machining, there is a problem that the machining accuracy deteriorates because the electrodes gradually wear out. Especially, in simple electrode electrical discharge machining, where the electrode volume is smaller than the machining volume, this problem has a serious influence. There is. Up to now, attempts have been made to measure the length of the electrode periodically during processing to reduce the influence of electrode consumption, but no satisfactory results have been obtained. For this problem,
Tsuchiya and Kaneko et al. Of the Faculty of Engineering of Yamagata University found that the electrode consumption becomes a steady state while continuing the processing, and a method of improving the processing accuracy by predicting and correcting the electrode consumption in this steady state (hereinafter, This is called a predictive correction type simple electrode electric discharge machining method). (For example, "Three-dimensional controlled electrical discharge machining with a cylindrical electrode (3rd report)", The Institute of Electrical Processing, V
ol. 17, No. 34, p30-42 (1984)).

FIG. 26 is a block diagram of a predictive correction type simple electrode electric discharge machine. In the figure, 5 is the electrode trajectory data,
Reference numeral 6 is a trajectory correction unit that corrects the trajectory of the electrode trajectory data 5 in the longitudinal direction of the electrode, 7 is the corrected electrode trajectory data corrected by the trajectory correction unit 6, and 4 is the work 2 and the machining power source 3 according to the corrected electrode trajectory data 7. It is a control device for controlling and scanning the electrode 1.

Next, the operation will be described. First, prior to processing, the wear compensation constant m is determined by a preliminary experiment.
If the electrode wear is in a steady state, the orbital feed length L is proportional to the electrode wear length z, and the relationship z = mL is established using the proportional constant m. Therefore, it suffices to perform processing for an appropriate processing length L, measure the electrode consumption length z, and calculate m. Needless to say, if m can be determined based on an experiment conducted before, known experience, knowledge, theory, etc., a preliminary experiment is not necessary.

In FIG. 26, the electrode trajectory data 5 does not consider the consumption of the electrode. Therefore, the trajectory correction unit 6 generates corrected electrode trajectory data 7 by adding a trajectory of Δz = m · ΔL to the electrode trajectory data 5 for each unit length ΔL in the electrode longitudinal direction. According to a preliminary experiment, the electrode length is consumed by Δz with respect to the machining length ΔL, and when machining along the corrected electrode trajectory data 7, the electrode tip portion gradually wears and moves along the electrode trajectory data 5. become. Then, finally, the control device 4 causes the work 2,
By controlling the machining power supply 3 and scanning the electrodes along the corrected electrode trajectory data 7, the workpiece can be machined into a predetermined shape.

[0006]

As described above, the predictive correction type simple electrode electric discharge machining apparatus performs machining along a trajectory in which the wear of the electrode is compensated in advance, so that it is higher than the conventional simple electrode electric discharge machining apparatus. Precision processing is possible. However, it is necessary to correct the electrode trajectory data before machining, and particularly when the machining shape of the workpiece is complicated, a large amount of corrected electrode trajectory data must be generated through complicated calculation. There was a point.

The present invention has been made in order to solve such a problem, and by recognizing the amount of electrode wear during processing of a workpiece and automatically performing an electrode wear compensation operation, The purpose of the present invention is to obtain an electric discharge machining device that can omit calculation of corrected electrode trajectory data before machining.

[0008]

An electric discharge machine according to claim 1 of the present invention is an electric discharge machine for machining while controlling a relative position of a machining electrode and a workpiece according to predetermined orbit data. A unit for detecting the occurrence of discharge, a unit wear correction length determining unit for obtaining an electrode wear correction length per one discharge pulse, and a unit wear correction length in the electrode longitudinal direction according to the electrode wear correction length each time discharge is detected. An electrode wear compensation means for performing wear compensation operation is provided.

According to a second aspect of the present invention, there is provided an electric discharge machining apparatus for machining while controlling a relative position of a machining electrode and a workpiece according to predetermined orbit data. A measurement period setting means for determining a period for acquiring certain information during processing, a wear correction length determining means for obtaining an electrode wear correction length using the information acquired during the measurement period, and the obtained electrode wear correction length. Accordingly, the electrode wear compensation means for performing the wear compensation operation in the longitudinal direction of the electrode is provided.

According to a third aspect of the present invention, there is provided an electric discharge machining apparatus according to the first aspect, in which the unit wear correction length determining means is a wear correction data representing a relationship between a discharge pulse number and an electrode wear correction amount. And a unit consumption correction length calculation means for calculating the consumption correction length per discharge pulse using the consumption correction data.

According to a fourth aspect of the present invention, in the electric discharge machining apparatus according to the second aspect, the unit wear correction length for calculating the electrode wear correction length per discharge pulse is used as the wear correction length determining means. And a unit wear correction length integration unit for adding up the unit electrode wear correction length.

According to a fifth aspect of the present invention, in the electric discharge machining apparatus according to the second aspect, as the consumption correction length determining means, a means for counting the number of generated discharge pulses, a discharge pulse number and electrode consumption. The wear correction data indicating the relationship with the correction amount, and the wear correction length calculation means for calculating the electrode wear correction length using the wear correction data and the number of discharge pulses are provided.

According to a sixth aspect of the present invention, there is provided an electric discharge machining apparatus according to the second aspect, wherein the machining current integration means, the machining current integral value, and the electrode wear correction amount are used as the wear correction length determining means. And a consumption correction length calculating means for calculating an electrode consumption correction length using the consumption correction data and the machining current integral value.

According to a seventh aspect of the present invention, in the electric discharge machining apparatus according to the third or fifth aspect, the unit electrode consumption data defining the electrode consumption correction volume per discharge pulse as the consumption correction data. Is provided.

According to an eighth aspect of the present invention, in the electric discharge machining apparatus according to the sixth aspect, the unit current electrode consumption data defining the electrode consumption correction volume per unit machining current integral value is used as the consumption correction data. It is provided.

An electric discharge machine according to a ninth aspect of the present invention is the electric discharge machine according to the third aspect, the fifth aspect, or the sixth aspect, wherein a means for storing the projected area in the longitudinal direction of the electrode is provided as the consumption correction data. It is a thing.

According to a tenth aspect of the present invention, there is provided an electric discharge machine according to the third, fifth or sixth aspect, in which the consumption correction data is represented by an electrode longitudinal direction projected area and an electrode consumption correction length. It was calculated as having an inversely proportional relationship.

According to an eleventh aspect of the present invention, in the electric discharge machining apparatus according to the second aspect, the measuring period setting means detects that the relative moving distance between the electrode and the workpiece exceeds a certain distance. An electrode moving distance measuring means is provided.

An electric discharge machine according to a twelfth aspect of the present invention is the electric discharge machine according to the second aspect, wherein the relative position of the electrode and the workpiece reaches a predetermined position as the measurement period setting means. A correction position storage means for detecting is provided.

An electric discharge machine according to a thirteenth aspect of the present invention is the electric discharge machine according to the second aspect, wherein the measuring period setting means is provided with a clocking means for detecting the passage of a fixed time.

According to a fourteenth aspect of the present invention, in the electric discharge machining apparatus according to the second aspect, as the measurement period setting means, a constant pulse for detecting that the number of generated discharge pulses exceeds a certain pulse number. The number detecting means is provided.

According to a fifteenth aspect of the present invention, in the electric discharge machining apparatus according to the second aspect, a discharge pulse detecting means for detecting generation of a discharge pulse is provided as a measuring period setting means.

According to a sixteenth aspect of the present invention, in the electric discharge machining apparatus according to the second aspect, the maximum permissible electric discharge is calculated from preset maximum permissible electrode wear correction length and wear correction data as the measurement period setting means. The electrode consumption correction length pulse number converting means for calculating the pulse number and the constant pulse number detecting means for detecting that the discharge pulse number exceeds a fixed pulse number are provided.

According to a seventeenth aspect of the present invention, in the electric discharge machining apparatus according to the second aspect, the constant electrode wear correction for detecting that the wear correction length exceeds a certain length is used as the measurement period setting means. A length detecting means is provided.

The electric discharge machining apparatus according to claim 18 of the present invention is the electric discharge machining apparatus according to claim 1 or 2, wherein the electrode wear compensating means has a relative position with respect to the workpiece according to predetermined orbit data. The electrode longitudinal direction moving means for moving the electrode in the longitudinal direction according to the electrode wear correction length is controlled.

According to a nineteenth aspect of the present invention, in the electric discharge machining apparatus according to the first or the second aspect, the electrode consumption compensation means for accumulating the electrode consumption compensation length within the measurement period as the electrode consumption compensation means. There is provided a length integrating means and an electrode longitudinal direction position adding means for adding and outputting the integrated electrode wear correction length with respect to the longitudinal direction data of the electrode trajectory data.

According to a twentieth aspect of the present invention, in the electric discharge machining apparatus according to the first or second aspect, the electrode wear compensation means suspends the movement of the electrode in accordance with the trajectory data and corrects the electrode wear. A consumption correction processing control means for moving the electrode in the longitudinal direction by a length corresponding to the length is provided.

According to a twenty-first aspect of the present invention, in the electric discharge machining apparatus according to the twentieth aspect, during the electrode wear compensation operation, an electric discharge machining condition in which the electrode wear is less than that during the machining according to the electrode trajectory data is set. Is what you use.

An electric discharge machine according to a twenty-second aspect of the present invention is the electric discharge machine according to the second aspect, wherein the consumption correction length determining means includes means for adding up the information acquired over a plurality of measurement periods, and the means. A means for calculating the total electrode wear correction length from the total information and the wear correction data is provided.

According to a twenty-third aspect of the present invention, there is provided an electrical discharge pulse in the unit wear correction length determining means in the first electrical discharge machine or the wear correction length determining means in the second electrical discharge machine. Is provided with a discharge state determination means for determining at least either a short circuit pulse or a normal discharge pulse.

According to a twenty-fourth aspect of the present invention, in the electrical discharge machine of the twenty-third aspect, the electrical discharge state determining means of the electrical discharge machine is any one of a short circuit pulse, a normal discharge pulse, an open pulse, and an abnormal discharge pulse. This is so that it can be distinguished.

An electric discharge machine according to a twenty-fifth aspect of the present invention is the electric discharge machine according to the first or second aspect, in which the electrode wear compensation means has an electrode wear compensation length measured and a preset electrode wear correction length. A minimum correction length ensuring means is provided for performing the electrode wear compensation operation only when the electrode wear compensation length is longer than the minimum electrode wear compensation length for starting the compensation operation.

According to a twenty-sixth aspect of the present invention, in the electric discharge machining apparatus according to the second aspect, when the machining condition is changed by adding a means for detecting a change in the machining condition to the measurement period setting means. Also, the compensation operation can be performed.

According to a twenty-seventh aspect of the present invention, in the electric discharge machining apparatus according to the fifth or sixth aspect, the wear correction data is obtained from a non-linear relationship between information obtained during machining and the wear correction length. It is a thing.

[0035]

In the electric discharge machine according to claim 1 of the present invention,
The electrode wear correction length per one discharge pulse is obtained by the unit wear correction length determining means, and every time the occurrence of discharge is detected by the discharge occurrence detecting means, the electrode wear compensating means extends the electrode wear correction length in the electrode longitudinal direction. Then, the electrode wear compensation operation is performed.

In the electric discharge machining apparatus according to the second aspect of the present invention, the measurement period setting means determines a period for obtaining the information correlating with the electrode wear amount, and the consumption correction length determining means determines the information obtained during this period. The electrode wear compensation length is obtained from the electrode wear compensation means, and the electrode wear compensation means performs the electrode wear compensation operation according to the electrode wear compensation length.

In the electric discharge machining apparatus according to the third aspect of the present invention, the unit consumption correction length calculation means uses the consumption correction data representing the relationship between the number of discharge pulses and the electrode wear correction amount to wear per discharge pulse. Calculate the corrected length.

In the electric discharge machine according to the fourth aspect of the present invention, the unit wear correction length determining means calculates the electrode wear correction length per discharge pulse, and the unit wear correction length integrating means calculates the unit electrode wear correction. Add up the length.

In the electric discharge machining apparatus according to the fifth aspect of the present invention, the number of electric discharge pulses generated by the electric discharge pulse counting means is counted, and the relationship between the counted number of electric discharge pulses, the number of electric discharge pulses, and the electrode wear correction amount is represented. The electrode wear correction length is calculated from the wear correction data by the wear correction length calculation means.

In the electric discharge machining apparatus according to the sixth aspect of the present invention, the machining current is integrated by the machining current integrating means, and the consumption correction data representing the relationship between the machining current integrated value, the machining current integrated value, and the electrode wear correction amount. Then, the electrode wear correction length is calculated by the wear correction length calculation means.

In the electric discharge machine according to the seventh aspect of the present invention, the unit electrode wear data defining the electrode wear correction volume per discharge pulse is held by the wear correction data.

In the electric discharge machining apparatus according to the eighth aspect of the present invention, the consumption current correction data holds the unit current electrode consumption data defining the electrode consumption correction volume per unit machining current integral value.

In the electric discharge machine according to the ninth aspect of the present invention, the projected area in the longitudinal direction of the electrode is stored by the projected area in the electrode longitudinal direction storage means.

In the electric discharge machine according to the tenth aspect of the present invention, the projection area of the electrode in the longitudinal direction and the correction length of the electrode wear are defined in an inversely proportional relationship by the wear correction data.

In the electric discharge machining apparatus according to the eleventh aspect of the present invention, the electrode moving distance measuring means detects that the relative moving distance of the electrode and the workpiece exceeds a certain distance.

In the electric discharge machine according to the twelfth aspect of the present invention, it is detected by the correction position storage means that the relative position of the electrode and the workpiece reaches a predetermined position.

In the electric discharge machine according to the thirteenth aspect of the present invention, it is detected by the time measuring means that a certain time has elapsed.

In the electric discharge machine according to the fourteenth aspect of the present invention, it is detected by the constant pulse number detecting means that the number of discharge pulses exceeds a certain number.

In the electric discharge machining apparatus according to the fifteenth aspect of the present invention, the occurrence of the discharge pulse is detected by the discharge pulse detecting means.

In the electric discharge machine according to the sixteenth aspect of the present invention, the maximum allowable electrode wear correction length and the maximum allowable discharge pulse number are calculated in advance by the electrode wear correction length pulse number conversion means. The constant pulse number detecting means detects that the number of discharge pulses exceeds the maximum allowable number of discharge pulses.

In the electric discharge machining apparatus according to the seventeenth aspect of the present invention, it is detected by the constant electrode wear correction length detecting means that the wear correction length exceeds a certain length.

In the electric discharge machining apparatus according to the eighteenth aspect of the present invention, the electrode wear correction length is followed by the electrode longitudinal direction moving means whose relative position to the workpiece is controlled according to the predetermined trajectory data. Electrode longitudinal movement is performed.

In the electric discharge machining apparatus according to the nineteenth aspect of the present invention, the electrode wear correction length integrating means integrates the electrode wear correction length within the measurement period, and the electrode longitudinal direction position adding means adds the electrode trajectory data in the longitudinal direction. This integrated electrode wear correction length is added to the data and output.

In the electric discharge machining apparatus according to the twentieth aspect of the present invention, the movement of the electrode according to the trajectory data is interrupted by the consumption correction machining control means, and the electrode longitudinal movement corresponding to the electrode consumption correction length is performed.

In the electric discharge machining apparatus according to the twenty-first aspect of the present invention, the electric discharge machining condition in which the electrode consumption is less than that in the machining according to the electrode trajectory data is used.

In the electrical discharge machine according to claim 22 of the present invention, the electrode wear correction length calculation means calculates the total electrodes from the information and wear correction data obtained by the means for adding information obtained over a plurality of measurement periods. The wear correction length is calculated.

In the electric discharge machine according to the twenty-third aspect of the present invention, the discharge state judging means can judge the discharge pulse to be at least a short-circuit pulse or a normal discharge pulse.

In the electric discharge machine according to the twenty-fourth aspect of the present invention, the discharge state determining means can determine the discharge pulse to be at least one of a short circuit pulse, a normal discharge pulse, an open pulse and an abnormal discharge pulse.

In the electric discharge machining apparatus according to the twenty-fifth aspect of the present invention, the minimum electrode wear compensation length measured by the minimum compensation length ensuring means is the minimum electrode wear compensation length for starting the preset electrode compensation operation. Only when it is larger than this, the electrode wear compensation operation is performed.

In the electric discharge machining apparatus according to the twenty-sixth aspect of the present invention, the compensation operation is performed by the machining condition change detecting means even when the machining condition is changed.

In the electric discharge machining apparatus according to the twenty-seventh aspect of the present invention, the wear correction data is defined by a non-linear relationship between the information obtained during machining and the wear correction length.

[0062]

【Example】

Example 1. FIG. 1 is a block diagram of an electric discharge machine showing an embodiment of the present invention. In the present embodiment, as the unit wear correction length determining means, wear correction data including unit electrode wear correction volume data and electrode longitudinal projection area storage means, and unit wear correction length calculating means are used, and the electrode wear compensating means is used. The electrode wear correction length integrating means and the electrode longitudinal direction position adding means are used. In the figure, 10 is a discharge pulse detecting means for detecting a discharge pulse of the machining power source 3, and 11 is a discharge pulse detecting means from the unit electrode wear correction volume data 8 and the electrode longitudinal direction projected area storage means 9 electrode longitudinal direction projected area. It is a unit consumption correction length calculation means for calculating the electrode consumption correction length for each discharge pulse detected in 10. Reference numeral 12 is an electrode wear correction length integration means for integrating the unit electrode wear correction length Δz calculated by the unit wear correction length calculation means, and 13 is total electrode wear calculated by the electrode wear correction length integration means 12. It is an electrode longitudinal direction position adding means for adding the corrected length Zs in the electrode longitudinal direction of the electrode trajectory data 5 and outputting it. Reference numeral 4 is a control device for scanning the electrode 1 according to the output of the electrode longitudinal direction position adding means 13 and processing the work 2.

Next, the operation will be described. In the electric discharge machining, as long as the machining progresses normally, the number of electric discharge pulses and the electrode consumption amount are in a proportional relationship, and the proportional constant is different for each machining condition. Therefore, in the unit electrode wear correction volume data 8, the electrode wear correction volume for one discharge pulse is stored as the unit wear correction volume k for each machining condition.
This unit consumption correction volume k is generated during machining by performing machining under each machining condition using, for example, an electric discharge machine equipped with a pulse counter for counting electric discharge pulses, measuring electrode masses m1 and m2 before and after machining. It can be obtained by calculating k = (m1-m2) / (r · p) using the pulse number p and the specific gravity r of the electrode. Of course, the method of obtaining the unit consumption correction volume k is not limited to this method, and any method such as measuring the electrode volume before and after processing may be used. In the electrode longitudinal direction projected area storage means 9, an operator or C
The projected area S in the longitudinal direction of the electrode to be used is set by AD / CAM or the like. The discharge pulse detection means 10 detects the occurrence of a discharge pulse, and the unit wear correction length calculation means 11
Calculates the unit electrode wear correction length Δz = k / S per discharge pulse from the unit wear correction volume k corresponding to the processing conditions being used and the projected area S in the electrode longitudinal direction. The electrode wear correction length integration means 12 integrates the unit electrode wear correction length Δz calculated every time the generation of the discharge pulse is detected, and stores it as the total electrode wear correction length Zs. The electrode longitudinal direction position adding means 13 adds the total electrode wear correction length Zs to the electrode trajectory data 5 of the electrode trajectory data 5 and outputs it (for example, in the numerical controller). The control device 4 moves the electrodes according to the output of the electrode longitudinal direction position adding means 13 to perform machining.

As described above, in the present embodiment, the machining is performed along the trajectory corrected by the total electrode consumption correction length Zs obtained by integrating the unit electrode consumption correction length Δz generated by the generation of the discharge pulse. Unlike the predictive correction type simple electrode electric discharge machine, it is not necessary to generate the corrected electrode trajectory data 7 in consideration of electrode consumption prior to machining, and machining can be performed easily. Further, in this embodiment, the unit wear correction volume k determined by the processing conditions used is defined as the projected area S in the electrode longitudinal direction.
Although the unit electrode wear correction length Δz is calculated by dividing by, the wear correction data in which the unit electrode wear correction length Δz is recorded for each processing condition and each electrode longitudinal direction projected area S may be prepared. In this case, the division can be omitted, and the unit electrode wear correction length Δz can be obtained only by searching the data. Further, in the present embodiment, the electrode wear correction volume k per discharge pulse is defined as the wear correction data.
The electrode wear correction volume for a plurality of discharge pulses may be defined, and this volume may be divided by the number of discharge pulses to obtain the substantial electrode wear correction volume k per discharge pulse.

Example 2. FIG. 2 is a block diagram of an electric discharge machine showing another embodiment of the present invention. In the present embodiment, the consumption correction data, the discharge pulse detection means, and the unit consumption correction length calculation means are used as the unit consumption correction length determining means, and the electrode longitudinal direction moving means is used as the electrode consumption compensation means. In the figure, 14 is a unit consumption correction length calculation means 1
1 is an electrode longitudinal direction moving means for moving the electrode 1 in the longitudinal direction by the unit electrode wear correction length Δz calculated by 1. The control device 4 sends both the electrode longitudinal direction moving means 14 and the electrode 1 to the electrode trajectory data 5 Move according to. As described above, in the present embodiment, since the machining is performed while the electrode wear is corrected by the electrode longitudinal direction moving means, the correction electrode that considers the electrode wear prior to the machining as in the conventional predictive correction type simple electrode electric discharge machine is used. It is not necessary to generate the trajectory data 7, and the processing can be easily performed.

Example 3. FIG. 3 is a block diagram of an electric discharge machine showing another embodiment of the present invention. In the present embodiment, as the consumption correction length determining means, the unit consumption correction length determining means including the consumption correction data, the discharge pulse detecting means, and the unit consumption correction length calculating means, and the unit consumption correction length integrating means are used. The electrode moving distance measuring means is used as the measurement period setting means, and the electrode longitudinal direction moving means is used as the electrode wear compensation means. In the figure, reference numeral 16 is an electrode movement distance measuring means for measuring a relative movement distance between the electrode 1 and the work 2, detecting an electrode movement of an appropriate distance ΔL and transmitting the lapse of the measurement period. When the electrodes are moved, the distances are sequentially added up, and if processing is performed so that the results of the integrated distances and ΔL can be compared, this can be realized by a software program in the control device 4. Reference numeral 15 denotes an electrode wear correction length by integrating the unit electrode wear correction length Δz calculated by the unit wear correction length calculation means 11 within the measurement period (while an appropriate electrode moving distance is generated in this embodiment). It is a unit consumption correction length integration means for obtaining z, and this can also be realized by a software program in the numerical control device. The electrode longitudinal direction moving means 14 is not the unit electrode wear correction length Δz,
The electrode is moved in the longitudinal direction by an amount corresponding to the electrode wear correction length z.

As described above, in this embodiment, the electrode moving distance measuring means 16 is provided as the measuring period setting means,
The electrode wear correction length z can be calculated each time ΔL is processed, and the electrode wear correction length z can be calculated by integrating the unit wear correction length Δz over the measurement period. The electrode wear compensation operation can be performed according to the correction length z, and it is not necessary to generate the corrected electrode trajectory data 7 in consideration of electrode wear prior to machining unlike the conventional predictive correction type simple electrode electric discharge machine. Easy to process.

Although ΔL is constant in this embodiment, if it is configured to be appropriately changed depending on the processing conditions, the compensating operation can be performed for each optimum distance for each processing condition, so that high-speed and high-precision processing is realized. it can. Also, if the interval of the compensating operation can be changed according to the machining situation, such as by reducing ΔL when the discharge generation frequency is high, various machining can be coped with. Further, in the present embodiment, Δ
Although L is set separately from the processing condition, if ΔL corresponding to various processing conditions is also stored in the unit electrode wear correction volume data 8 and ΔL is set at the same time when the processing condition is set, You can save the trouble of setting. In the present embodiment, the size of ΔL was not particularly touched, but it may be increased as long as the machining accuracy allows, and the number of wear compensation operations may be reduced as much as possible, or as small as the resolution of the numerical controller. Then, the compensating operation in the longitudinal direction of the electrodes may be substantially always performed.

Example 4. FIG. 4 is a configuration diagram of an electric discharge machine showing another embodiment of the present invention. In the present embodiment, as the consumption correction length determining means, the consumption correction data, the discharge pulse counting means, and the consumption correction length calculating means are used, the electrode moving distance measuring means is used as the measurement period setting means, and the electrode consumption compensating means is used. The electrode wear correction length integrating means and the electrode longitudinal direction position adding means are used. In the figure, the discharge pulse counting means 17 counts the number of discharge pulses P generated during the measurement period, and the consumption correction length calculation means 18 counts the discharge pulse number P during the measurement period and the machining used. The unit wear correction volume k corresponding to the conditions and the projected area S in the electrode longitudinal direction
From this, the electrode wear correction length z = k · P / S is calculated. The electrode wear correction length integration means 12 integrates the electrode wear correction length z instead of the unit electrode wear correction length Δz in the first embodiment, and stores it as the total electrode wear correction length Zs.

As described above, in this embodiment, the electrode wear correction length z is calculated by counting the number of generated discharge pulses, and the electrode wear compensation operation is performed according to the electrode wear correction length z. Unlike the conventional predictive correction type simple electrode electric discharge machine, it is not necessary to generate the corrected electrode trajectory data 7 considering the electrode consumption prior to the machining, and the machining can be performed easily.

Example 5. FIG. 5 is a block diagram of an electric discharge machine showing another embodiment of the present invention. In the present embodiment, as the consumption correction length determining means, the consumption correction data, the machining current integrating means, and the consumption correction length calculating means are used, the electrode movement distance measuring means is used as the measurement period setting means, and the electrode consumption compensating means is used. The consumption correction length integrating means and the electrode longitudinal direction position adding means are used. In the figure, a machining current integrating means 19 is a means for integrating the machining current within the measurement period. For example, the machining current measured by a current sensor is integrated by an integrating circuit or numerically sampled by a digitizer. Methods such as totaling are conceivable.

As shown in the first embodiment, the number of discharge pulses and the amount of electrode wear are in a proportional relationship, but if the machining conditions are the same, the machining current waveforms of each discharge pulse will be the same, so the number of discharge pulses and the machining current will be the same. The integral value also has a proportional relationship, and therefore the electrode consumption amount and the machining current integral value also have a proportional relationship. As a result, if the electrode consumption compensation volume per unit machining current integral value for each machining condition is stored in the unit current electrode consumption compensation volume data 20 as the unit current consumption compensation volume Ki, the machining current integral instead of the number of discharge pulses. Example 4 using values
A function equivalent to can be realized. This unit current consumption correction volume Ki is, for example, the unit consumption correction volume k in the first embodiment.
Alternatively, the peak current Ip and the discharge duration Ton under the machining conditions may be used as Ki = k / (Ip · Ton), or each machining can be performed using an electric discharge machine equipped with machining current integrating means. Perform machining under each condition, measure the electrode masses m1 and m2 before and after machining, and use the machining current integral value I and the specific gravity r of the electrode to calculate Ki = (m1-m2) / (r · I) You may ask at. Of course, the method of obtaining the unit current consumption correction volume Ki is not limited to this method, and any method such as measuring the electrode volume before and after processing may be used.

As described above, in this embodiment, the electrode wear correction length z is calculated based on the machining current integral value measured by the machining current integrating means 19, and the electrode wear correction length z is consumed according to the electrode wear correction length z. Since the compensating operation is performed, it is not necessary to generate the corrected electrode trajectory data 7 in consideration of electrode consumption prior to machining, unlike the conventional predictive correction type simple electrode electric discharge machine.
Easy to process. In the present embodiment, the machining current is integrated to obtain the machining current integrated value within the measurement period, but the average machining current within the measurement period is measured, and this is multiplied by the measurement time to integrate. Alternatively, the integrated value of the machining current may be obtained substantially within the measurement period. In this case, since a current sensor having a low response frequency can be used, the cost can be reduced. Further, in the present embodiment, the machining current was used as the information obtained during machining, but since the discharge voltage is almost constant,
Even if the processing electric power is used instead of the processing electric current, the same effect can be obtained.

Example 6. FIG. 6 is a block diagram of an electric discharge machine showing another embodiment of the present invention. In the present embodiment, as the consumption correction length determining means, the consumption correction data, the discharge pulse counting means, and the consumption correction length calculating means are used, the electrode moving distance measuring means is used as the measurement period setting means, and the electrode consumption compensating means is used. The consumption correction processing control means is used.
In the figure, the consumption correction machining control means 21 calculates the consumption correction length z by the consumption correction length calculation means 18,
The controller 4 is instructed to interrupt the machining according to the electrode trajectory data 5. After processing is interrupted, consumption correction processing control means 21
Instructs the movement of z corresponding to the wear correction length in the longitudinal direction of the electrode to perform wear correction processing. Further, the consumption correction machining control means 21 moves the electrode trajectory data 5 by z in the longitudinal direction of the electrode so that the logical electrode position on the electrode trajectory data at the time of machining interruption according to the electrode trajectory data 5 is calculated after the consumption compensation machining. Then, the controller 4 is instructed to restart the machining according to the electrode trajectory data 5. Then, if necessary, processing along the electrode trajectory data and correction processing corresponding to the wear correction length are alternately repeated.

As described above, in the present embodiment, z corresponding to the consumption correction length calculated based on the information obtained during processing is z.
Since the consumption of the electrode is corrected by moving the electrode only in the longitudinal direction, it is necessary to generate the corrected electrode trajectory data 7 in consideration of the consumption of the electrode prior to the machining as in the conventional predictive correction type simple electrode electric discharge machine. No, it can be easily processed. It should be noted that the interruption of the machining of the control device 4 by the command from the consumption correction machining control means 21 may be configured so that the machining is interrupted immediately after the instruction by using an interrupt or the like, but the invention is not limited to this, and the trajectory data is not limited to this. The processing may be interrupted at an appropriate time such as when the processing of the line segment currently being processed is completed. In this case, by providing a means for accumulating the consumption correction length inside the consumption correction machining control means 21, even if the consumption correction length calculation results are obtained a plurality of times before the interruption of machining, these are integrated. As a result, the consumption compensation operation can be performed accurately. Further, in the present embodiment, the consumption correction machining control means 21 operates according to the consumption correction length z, but the unit electrode consumption correction length Δz instead of the consumption correction length z as in the first and second embodiments. In order to obtain, the consumption correction processing control means 21 operates according to the unit electrode consumption correction length Δz. Further, in the present embodiment, although the processing conditions were not mentioned, if the processing conditions that the electrode consumption amount is smaller than the processing time according to the electrode trajectory data 5 during the wear correction processing, the electrode shape during the wear correction processing is used. Can be prevented from changing. In this case, the electrode consumption amount can be accurately calculated by, for example, suspending the operation of the discharge pulse counting means during the wear correction processing so that the measurement period is not included while the wear correction processing is performed.

Example 7. FIG. 7 is a block diagram of an electric discharge machine showing another embodiment of the present invention. In this embodiment, as the consumption correction length determining means, the consumption correction data, the discharge pulse counting means and the consumption correction length calculating means are used, the correction position storing means is used as the measurement period setting means, and the consumption correction is performed as the electrode consumption compensating means. The processing control means is used. In the figure, the correction position storage means 22 stores in advance the position for performing the electrode wear compensation operation, and when it detects that the relative position between the electrode 1 and the workpiece 2 has reached the preset electrode wear compensation operation position, the measurement period Is a means for transmitting the progress of, and can be realized by, for example, a software program in the numerical control device. As described above, in the present embodiment, since the electrode wear compensation operation is performed by calculating the wear compensation amount within the measurement period set by the correction position storage means 22, like the conventional predictive correction type simple electrode electric discharge machine. Since it is not necessary to generate the modified electrode trajectory data 7 in consideration of electrode consumption prior to processing, processing can be performed easily.

Example 8. FIG. 8 is a block diagram of an electric discharge machine showing another embodiment of the present invention. In this embodiment, as the consumption correction length determining means, the consumption correction data, the discharge pulse counting means, and the consumption correction length calculating means are used, as the measurement period setting means, the clocking means is used, and as the electrode consumption compensating means, the consumption correction is made. The processing control means is used. In the figure,
When the time measuring means 23 detects the elapse of an appropriate time ΔT, it transmits the elapse of the measurement period. Thus, in this embodiment,
Since the electrode wear compensation operation is performed by calculating the wear compensation amount within the measurement period set by the time measuring means 23, a correction electrode that considers electrode wear prior to machining, as in the conventional predictive correction type simple electrode electric discharge machine. It is not necessary to generate the trajectory data 7, and the processing can be easily performed. In the present embodiment, ΔT is constant, but if it is configured to be appropriately changed depending on the processing conditions, the correction processing can be performed at the optimum intervals for each processing condition, so that high-speed and high-precision processing can be realized. Further, when the discharge generation frequency is high, if ΔT is reduced, the correction machining interval can be changed according to the machining situation, so that various machining can be performed. Further, in the present embodiment, ΔT is set separately from the processing condition, but ΔT corresponding to various processing conditions is also stored in the unit electrode wear correction volume data 8 and ΔT is set at the same time when the processing condition is set. If it is configured to do so, the trouble of setting can be saved.

Example 9. FIG. 9 is a block diagram of an electric discharge machine showing another embodiment of the present invention. In this embodiment, as the consumption correction length determining means, the consumption correction data, the discharge pulse counting means and the consumption correction length calculating means are used, the constant pulse number detecting means is used as the measuring period setting means, and the electrode consumption compensating means is used. The consumption correction processing control means is used. In the figure, the constant pulse number detecting means 24 is a means for counting the discharge pulses supplied from the machining power source 3 and transmitting the elapse of the measurement period when detecting the generation of the discharge pulse having an appropriate pulse number P. It is possible to use the zero detection signal of the down counter which is a preset value. As described above, in the present embodiment, since the electrode wear compensation operation is performed by calculating the wear compensation amount within the measurement period set by the constant pulse number detection means, the conventional predictive correction type simple electrode electric discharge machine is used. Since it is not necessary to generate the modified electrode trajectory data 7 in consideration of electrode consumption prior to processing, processing can be performed easily. Further, since the consumption compensation operation is performed at the time when the electrode consumption correction length having a constant length is generated, the processing accuracy can be maintained.

In this embodiment, the constant pulse number detecting means is specially provided, but as shown in the sixth and eighth embodiments, the discharge pulse counting means is provided and the discharge pulse counting means is regularly operated. The number of generated pulses is detected from the output and compared with P,
The constant pulse number may be detected by a software program in the control device 4. In this case, even if the actual number of generated pulses Pr becomes larger than P due to a delay in the detection of the constant pulse number generation, the consumption correction length is set to Pr instead of P like z = k · Pr / S. If the calculation is performed, an appropriate amount of the wear compensation operation is performed, so that highly accurate machining can be realized.
Further, in the present embodiment, the electrode wear correction length z was calculated every time a fixed number P of discharge pulses were detected. However, since the number of pulses is constant, the wear correction length z is also constant.
The consumption compensation operation may be performed by the amount of z calculated in advance before processing.

Further, although P is constant in this embodiment, if P is appropriately changed according to the processing conditions,
Since the wear compensation operation can be performed with the optimum wear amount for each machining condition, high-speed and high-precision machining can be realized. Further, if P is changed during machining such as increasing P when the discharge generation frequency is high, the compensating operation amount can be changed according to the machining situation, so that various machining can be performed. In the present embodiment, P is set separately from the processing conditions, but P corresponding to various processing conditions is also stored in the unit electrode wear correction volume data 8 so that P is set at the same time when the processing conditions are set. If it is configured to do so, the trouble of setting can be saved.

In the present embodiment, although the magnitude of P was not particularly referred to, P is set to 1 and the consumption compensation operation is performed every time a discharge pulse is generated. It may be configured to. In this case, the discharge pulse detection means 17 may be used as the measurement period setting means.
Further, the size of P is set as large as the machining accuracy allows, and the consumption compensation operation is performed as little as possible.
It may be configured to improve processing efficiency.

Example 10. FIG. 10 is a block diagram of an electric discharge machine showing another embodiment of the present invention. In this embodiment, the consumption correction data, the discharge pulse counting means, and the consumption correction length calculation means are used as the consumption correction length determining means, and the electrode consumption correction length pulse number conversion means and the constant pulse number are used as the measurement period setting means. The detection means is used, and the wear correction processing control means is used as the electrode wear compensation means. In the figure, when an appropriate wear correction length z is set, the electrode wear correction length pulse number conversion means 25 uses the unit electrode wear correction volume data k and the projected area S in the electrode longitudinal direction for electrodes corresponding to z. Calculate the number of discharge pulses P = z · S / k that causes consumption,
It is set in the constant pulse number detecting means 24. As described above, in the present embodiment, since the electrode consumption correction length pulse number conversion means 25 is provided, the consumption compensation operation can be performed every time the electrode consumption of a certain length occurs, so that the conventional predictive correction type simple electrode is used. Unlike the electric discharge machine, it is not necessary to generate the corrected electrode trajectory data 7 considering the electrode consumption prior to the machining, and the machining can be performed easily. In addition, since the correction processing is performed when the electrode is consumed for a certain length, the processing accuracy can be maintained.

In the present embodiment, no particular reference was made to the change in the wear correction length z, but it may be constant at all times, or if it is configured to be appropriately changed depending on the processing conditions, it is optimal for each processing condition. Since compensation processing can be performed with various wear correction amounts, high-speed and high-precision processing can be realized. In addition, if the frequency of discharge generation is high, increase z during processing such as increasing z.
If it is configured to be able to change, it is possible to change the consumption compensation operation amount according to the processing situation, so it is possible to cope with various processing. Furthermore, in the present embodiment, z is set separately from the processing condition, but z corresponding to various processing conditions is also stored in the unit electrode wear correction volume data 8 so that z is set at the same time when the processing condition is set. If it is configured to do so, the trouble of setting can be saved.

Further, in the present embodiment, the electrode wear correction length z is calculated every time a fixed number P of discharge pulses are detected, but the wear correction length z is the electrode wear correction length pulse number conversion means. Since it is set to 25, the consumption correction length calculation means 1
It is also possible to omit 8 and perform a consumption compensation operation corresponding to the set consumption correction length when the discharge pulse of a fixed number P is detected.

Example 11. FIG. 11 is a block diagram of an electric discharge machine showing another embodiment of the present invention. In this embodiment, as the consumption correction length determining means, the consumption correction data, the discharge pulse detecting means, the unit consumption correction length calculating means and the unit consumption correction length integrating means are used, and the measurement period setting means is
The consumption correction processing control means is used as the constant electrode wear correction length detection means and the electrode wear compensation means. In the figure, the constant electrode wear correction length detection means 26 is a means for checking the contents of the unit wear correction length integration means 15 and transmitting the elapse of the measurement period when detecting the occurrence of electrode wear of an appropriate wear correction length z. Yes, for example, it can be realized by a software program in a comparator or NC device. As described above, in this embodiment, since the constant electrode wear correction length detecting means 26 is provided, the wear compensating operation can be automatically performed every time when the electrode wear of a certain length occurs, so that the conventional predictive correction formula is simple. Unlike the electrode electric discharge machine, it is not necessary to generate the corrected electrode trajectory data 7 considering the electrode consumption prior to the machining, and the machining can be performed easily. In addition, since the compensating operation is performed when the electrode is worn out for a certain length, the processing accuracy can be maintained.

Although the wear correction length z is constant in this embodiment, if the wear correction length z is appropriately changed according to the processing conditions, the compensation operation can be performed with the wear correction amount optimum for each processing condition. High-precision processing can be realized. Further, if the z can be changed during processing, for example, by increasing z when the discharge generation frequency is high, the compensation operation amount can be changed according to the processing situation, so various processing can be supported. Furthermore, in the present embodiment, z is set separately from the processing condition, but z corresponding to various processing conditions is also stored in the unit electrode wear correction volume data 8 so that z is set at the same time when the processing condition is set. If it is configured to do so, the trouble of setting can be saved.

Further, in the present embodiment, the constant electrode wear correction length is detected by the software program in the control device 4, but in this case, the detection of the constant electrode wear correction length is delayed and the actual wear is actually consumed. Even when the correction length Zr becomes longer than the wear correction length detection threshold value z, if the wear compensation operation is performed by using the wear correction length Zr instead of z, a proper amount of the wear compensation operation is performed. Therefore, high precision machining can be realized.

Example 12 FIG. 12 is a block diagram of an electric discharge machine showing another embodiment of the present invention. In the figure,
Since all the constituent elements have been described above, the description of the operation thereof will be omitted, but in the present embodiment, the discharge pulse counting means, the wear correction data, and the wear correction length calculation means are used as the wear correction length determining means. In this configuration, the correction position storage means is used as the measurement period setting means, and the electrode wear correction length integration means and the electrode longitudinal direction position addition means are used as the electrode wear compensation means. In this embodiment, the electrode 1
The electrode wear correction length z is added every time when reaches the correction position, and the electrode 1 moves in the longitudinal direction according to the sum of the electrode trajectory data 5 and the electrode wear correction integration length Zs. The movement of the electrode 1 to the position is processing accompanied by compensation feed in the longitudinal direction of the electrode by the amount corresponding to the wear-out compensation length, and the correction processing can be substantially performed without interrupting the processing according to the trajectory data 5. . Further, unlike the conventional predictive correction type simple electrode electric discharge machine, it is not necessary to generate the corrected electrode trajectory data 7 in consideration of electrode consumption prior to the machining, and the machining can be easily performed.

Example 13 FIG. 13 is a block diagram of an electric discharge machine showing another embodiment of the present invention. In this embodiment, as the consumption correction length determining means, the consumption correction data, the total discharge pulse counting means, and the consumption correction length calculating means are used.
The electrode moving distance measuring means is used as the measurement period setting means, and the electrode longitudinal direction position adding means is used as the electrode wear compensation means. In the figure, a total discharge pulse counting means 27 is a means for counting the total number Ps of discharge pulses generated in a plurality of measurement periods, and the consumption correction length calculating means 1
8 calculates the total electrode wear correction length Zs = k · Ps / S using the total discharge pulse number Ps of the total discharge pulse counting means 27, not the discharge pulse number P within the measurement period. As described above, in this embodiment, since the total electrode wear correction length Zs is calculated by adding up the number of discharge pulses generated in a plurality of measurement periods, the electrode wear correction length integration is performed as shown in the fourth embodiment. The same effect can be obtained without providing the means 12. Further, in the present embodiment, the total number of discharge pulses is calculated,
As shown in the fifth embodiment, the same effect can be obtained by summing up any information acquired during the measurement period, such as the machining current and the integrated value of the machining current.

Example 14 FIG. 14 is a block diagram of an electric discharge machine showing another embodiment of the present invention. In this embodiment, a discharge state determination means is provided as a discharge pulse detection or counting means.

In the electric discharge machining, it was shown in Example 1 that the number of discharge pulses and the amount of electrode wear are in a proportional relationship as long as the machining is normally performed. It does not apply to situations where short circuits occur frequently. In this case, the unit wear-out correction volume kn indicating the electrode wear-out correction volume kn indicating the electrode wear-out correction volume per one discharge pulse and the short-time unit wear-out correction volume ks indicating the electrode wear-out correction volume per one short-circuit pulse are also included in the unit electrode wear correction volume data Must be stored. These kn and ks are machined twice using, for example, an electric discharge machine equipped with a normal discharge pulse counter and a short circuit discharge pulse counter, and the normal discharge pulse number Pn, short circuit pulse number Ps, and electrode mass m before and after machining
1, m2 and the specific gravity r of the electrode, kn · Pn + ks · P
It can be obtained by making s = (m1−m2) / r simultaneous for two machining operations and solving for kn and ks. Of course, the method of obtaining the unit consumption correction volume k is not limited to this method, and any method such as measuring the electrode volume before and after processing may be used.

In the figure, the discharge state judging means 28 is a means for judging a normal discharge pulse and a short circuit pulse for each machining pulse that is generated. For example, when the average voltage during discharging is a threshold value or less, Other methods such as distinguishing from the normal discharge pulse can be considered. Of the discharge pulses generated within the measurement period, the discharge state determination means 28
The normal discharge pulse counting means 29 counts the discharge pulses which are determined to be normal discharge pulses, and the short circuit pulse counting means 30 counts the discharge pulses which is determined to be a short circuit pulse. When the consumption correction length calculation means 18 receives the elapse of the measurement period, the unit consumption correction volume kn corresponding to the processing condition used, the unit consumption correction volume at short circuit ks, the projected area S in the electrode longitudinal direction, and the count are calculated. Normal discharge pulse number P
n, the number of short-circuit pulses Ps, the electrode wear correction length z = (kn
-Pn + ks-Ps) / S is calculated.

As described above, in the present embodiment, since the discharge state determining means 28 is provided, the electrode consumption amount can be accurately measured even if the discharge state deteriorates, and the consumption compensation operation can be appropriately performed. Precision processing can be realized. Further, in the present embodiment, both kn and ks are set, but using the ratio rs of the electrode wear amount of the short-circuit pulse to the normal discharge pulse, z = kn (Pn + rs.Ps) / S is used to correct the electrode wear correction length. May be obtained, and this method is useful when rs is almost constant under many processing conditions. Further, instead of the normal discharge pulse counting means 29 or the short circuit pulse counting means 30, a means for counting the total number of generated discharge pulses is provided, and one pulse number is subtracted from the total pulse number to obtain the other pulse number. It may be configured as follows. Furthermore, in the present embodiment, the discharge state determination means 28
The discharge pulse was classified into a normal discharge pulse and a short-circuit pulse by, but it can be discriminated as a normal discharge pulse and an abnormal discharge pulse depending on the magnitude of the high-frequency component that is superimposed on the voltage waveform during discharge. If it is configured such that it can be classified into the open pulse that becomes clear, the electrode consumption can be corrected more accurately, and more accurate machining can be realized. Then, among the determined pulses, a pulse that does not substantially affect the consumption of the electrode such as an open pulse may be not counted.

Example 15. FIG. 15 is a block diagram of an electric discharge machine showing another embodiment of the present invention. In this embodiment,
A minimum correction length guaranteeing means is added to the consumption correction length determining means. In the figure, the minimum correction length guaranteeing means 31
Is a means for performing the electrode compensation operation only when the measured electrode wear correction length is larger than a preset minimum electrode wear correction length for starting the electrode compensation operation. Is set to the minimum consumption correction length Zmin for performing the compensation operation, and the consumption correction length accumulating means is also provided inside. The minimum correction length guaranteeing means 31 integrates the wear correction length z calculated by the wear correction length calculating means 18 into the wear correction length accumulating means inside and compares the integration result with Zmin. When the integration result is larger than Zmin, the contents of the internal wear correction length accumulating means are cleared and the integration result is output to the electrode wear compensating means as the wear correction length. When the integrated result is smaller than Zmin, the consumption correction length is not output and the consumption compensation operation is not performed. Further, if the integrated result is smaller than Zmin, the contents of the internal wear correction length accumulating means are not cleared, so after the next measurement period elapses, the result of adding the newly calculated wear correction length and Zmin are calculated. It will be compared.

As described above, in the present embodiment, since the minimum correction length guaranteeing means 31 is provided, the wear compensation operation can be omitted when the wear correction length is less than a certain value, so that the machining accuracy is lowered. Efficient processing can be realized without performing.

Example 16. FIG. 16 is a block diagram of an electric discharge machine showing another embodiment of the present invention. In this embodiment,
The processing condition changing means is added to the measurement period determining means.

In electrical discharge machining, in order to maintain a good electrical discharge state, the operator or the adaptive control device may change the machining conditions such as the discharge time and the rest time. Further, in order to obtain a good machined surface at a high speed, it is routine to perform rough / medium finish machining step by step. In this case, the machining conditions change the machining conditions during machining. The machining condition change detection means 32 is means for transmitting the elapse of the measurement period when it detects that the machining condition is changed during machining in such a case, and is easily realized by, for example, a commonly used logic circuit or software program. it can. The consumption-correction-length calculating means 18 receives the elapse of the measurement period not only from the timing means 23 but also from the processing condition change detecting means 32, and calculates the consumption-correction length.

As described above, in the present embodiment, since the processing condition change detecting means 32 is provided, the correct electrode wear correction length can be calculated even in the processing in which the processing conditions are changed during the processing. , Proper wear compensation operation can be performed. In the present embodiment, the processing condition change detecting means 32 and the other measuring period determining means (time measuring means in this case) are configured to operate independently of each other, but the processing condition change is detected. In this case, the other measuring period determining means may be restarted. Further, in this embodiment,
The consumption correction length was calculated each time a change in machining conditions was detected, but the discharge pulse number memory stores the machining conditions used when a change in machining conditions was detected and the number of pulses machined under those machining conditions. Means is provided, and all are stored together with the processing conditions using the number of pulses until the elapse of the measurement period is transmitted by the measurement period determination means such as the time measuring means 23, and after the measurement period elapses, the electrode wear correction is performed from these stored data. The length may be collectively calculated.
Of course, a required number of discharge pulse counting means 17 are provided in parallel, and the discharge pulse counting means 17 used for each processing condition is used.
Alternatively, the number of pulses may be substantially maintained for each processing condition.

Further, in all the embodiments described above, the unit consumption correction volume k or the unit current consumption correction volume Ki and the electrode longitudinal projection area S are used as the consumption correction data, but the contents of the consumption correction data are The present invention is not limited to the above, and for example, for each machining condition and electrode projected area S, the number of discharge pulses or machining current integral value that causes electrode consumption of a certain length of electrode wear correction length is stored, and the like. Any data may be stored as long as the data represents the relationship between the obtained information and the electrode wear correction volume or the electrode wear correction length. Further, the processing conditions mentioned here are not limited to the processing electrical conditions, and can be stored in a fine form including other processing conditions such as the electrode material, the processing liquid treatment method, and the processing liquid pressure. Yes, in this case, processing can be performed with higher accuracy.

Example 17 In all of the embodiments described so far, the wear correction length of the wear correction data and the number of discharge pulses are in a proportional relationship, and even in the electric discharge machining, as long as the machining is normally performed, the number of discharge pulses and the number of electrodes The proportional relationship with the consumed amount is as shown in the first embodiment. Therefore, if the consumption correction length proportional to the number of discharge pulses is calculated based on the consumption correction volume per discharge pulse, the consumption correction operation amount is sufficient in principle. However, since the wear correction data always includes an error, the difference between the calculated wear correction length and the actual electrode wear length cannot be neglected in continuing the processing, which deteriorates the processing quality. In order to explain this in detail, Example 4 is used here as an example.

First, a case in which the consumption correction data has no error in the fourth embodiment will be described with reference to FIG.
In the figure, (a), (b) and (c) are respectively the first,
The state of the electrode after the lapse of the second and third consumption correction length measurement periods, P1, P2, and P3 are the number of discharge pulses counted during the first, second, and third consumption correction length measurement periods, respectively.
Z1, Z2, and Z3 are wear correction lengths calculated using P1, P2, and P3, respectively, X01 and X02 are electrode orbit data during the first and second electrode wear compensation operations, respectively.
11 and X12 are electrode position command data output to the control device by the first and second electrode wear compensation operations, respectively.
21 and X22 are actual trajectories of the electrode tip. After the first wear-correction length measurement period has elapsed, the number of discharge pulses P1
Is counted (state (a)), the consumption correction length Z1 is calculated by this P1, the electrode 1 moves according to the position command data X11 in which Z1 is added to the electrode trajectory data X01, and then the second time. The number of discharge pulses P2 is counted after the electrode wear correction length measurement period of is elapsed (state (b)). Since the electrode consumption length of Z2 occurs during this period, the actual trajectory of the electrode tip end portion is X21. Less than,
Similarly, the wear correction length Z2 is calculated from P2, and when the electrode moves according to the position command data X12 in which Z1 + Z2 is added to the electrode locus data X02, the electrode wear length of Z3 is generated. Is the actual trajectory of X
22 (state (c)). As described above, when there is no error in the consumption correction data, the electrode trajectory data and the actual trajectory of the electrode tip end portion become substantially equal, and the expected effect can be obtained.

Next, in the fourth embodiment, the case where the consumption correction data has an error will be described with reference to FIGS. Here, parts that are the same as or equivalent to those in FIG. 17 are assigned the same reference numerals and description thereof is omitted. FIG. 18 is a diagram showing an example of the wear correction data in which the number of discharge pulses and the wear correction length are proportional, 33 is the true electrode wear length,
Reference numeral 34 is the wear correction length calculated from the wear data, and points A, B, and C are operating points after the first, second, and third correction length measurement periods, respectively. In addition, Δ in FIGS.
Z1, ΔZ2, and ΔZ3 are the true electrode wear length generated in the first, second, and third wear correction length periods, respectively, and Z1,
This is an error from Z2 and Z3.

In FIG. 18, the discharge pulse number and the electrode wear amount are in a proportional relationship as long as the machining is normally performed. Therefore, the discharge pulse number and the true electrode wear length 33 are as shown by the broken line. There is a proportional relationship. On the other hand, the consumption correction length calculation means 18 calculates the unit consumption correction volume k and the projected area S in the electrode longitudinal direction.
And the electrode wear correction length z from the counted number P of discharge pulses
= K · P / S is calculated, the discharge pulse number and the wear correction length are in a proportional relationship, but since the unit wear correction volume includes an error, as shown by 34, the true electrode wear length is Have different proportional relationships. FIG. 19 shows the state of the electrode 1 when such consumption correction data is used. Here, for the sake of simplicity, the true electrode consumption length shown in FIG. 18 is larger than the consumption correction length. A large case will be described. When the first electrode wear correction length measurement period has elapsed and the number of pulses P1 is counted (state (a)),
At this time, the wear length of (Z1 + ΔZ1) is actually generated in the electrode 1, but the wear correction length is calculated as P1 from P1, and the position command data X11 is obtained by adding Z1 to the electrode trajectory data X01. Therefore, the electrode 1 moves, the second electrode wear correction length measurement period elapses, and the number of discharge pulses P
2 is counted (state (b)). In the meantime, (Z2 + ΔZ
Since the electrode wear length of 2) has occurred, the actual locus of the electrode tip end portion is X21. Similarly, the wear correction length Z2 is calculated from P2 and Z1 is added to the electrode trajectory data X02.
When the electrode moves in accordance with the position command data X12 to which + Z2 is added, the electrode consumption length of (Z3 + ΔZ3) is generated, so the actual trajectory of the electrode tip end portion becomes X22 (state (c)). As is clear from the figure, errors accumulate as the machining progresses, and the difference between the actual trajectory of the electrode tip and the electrode trajectory data gradually increases. Here, the important point is that the machining depth gradually decreases due to the accumulation of errors, and the machining amount per unit electrode moving distance gradually decreases. As a result, the processing amount in the measurement period gradually decreases, and the number of pulses counted in the measurement period decreases. Considering this point with reference to FIG. 18, the second time (point B) rather than the first time (point A), and the third time (point C).
In this case, the number of discharge pulses counted is smaller. Therefore, the operating point gradually moves toward the origin, and finally the machining depth becomes zero, and no machining is performed (origin).

On the contrary, when the true electrode wear length is smaller than the wear correction length, it is apparent that the wear correction length becomes excessive and the working depth gradually increases. That is, the number of discharge pulses counted as shown in FIG.
When the wear-corrected length and the true wear-out length of the electrode are plotted on the vertical axis, the operating point on the wear-corrected length graph is below the true wear-length graph as the machining progresses. Move to the left (direction with few pulses) and to the right (direction with many pulses) when above. In consideration of the above facts, the present embodiment uses non-linear data with respect to the number of discharge pulses as the wear correction data, and is configured to perform processing as the electrode trajectory data even if the wear correction data includes an error. It is a thing.

FIG. 20 shows a block diagram of the electric discharge machining apparatus of this embodiment, and FIG. 21 shows an example of consumption correction data showing the relationship between the number of discharge pulses and the consumption correction length. is there. In FIG. 21, point L is an example of an operating point whose wear correction length is smaller than the true electrode wear length, point R is an example of an operating point whose wear correction length is larger than the true electrode wear length, and point M is these. Is the equilibrium operating point of. In FIG. 20, the nonlinear wear correction data 35 shows that when the wear correction length is graphed with the pulse number as the horizontal axis, the true electrode wear length 33 is as the pulse number increases as shown in FIG. It is set to intersect from the top of the graph to the bottom.
When the consumption correction length calculation means 18 receives the elapse of the measurement period, it refers to the non-linear consumption correction data 35 according to the counted discharge pulse number P to obtain the consumption correction length. At this time, if the wear correction length is smaller than the true electrode wear length (point L), the operating point moves to the left, and if the wear correction length is larger than the true electrode wear length (point R), The operating point moves to the right. Then, as the machining progresses, the operating point converges on the equilibrium operating point (point M), and a stable machining depth is obtained. As described above, in the present embodiment, since the wear correction data is made non-linear with respect to the number of discharge pulses, the machining depth does not diverge even if there is an error in the estimation of the electrode wear length,
Stable processing is possible.

Although the true electrode wear length is not known in practice, the slope is infinite at the origin and increases in the order of one or less of the pulse number, as illustrated in this embodiment. All the linear graphs are displayed from top to bottom by setting the consumption correction data (FIG. 21) and the consumption correction data (FIG. 22 and FIG. 23) such that the consumption correction length decreases as the number of pulses increases. It is easy to set up to cross. Further, assuming that the true electrode wear length exists within an appropriate range on the graph, by using appropriate nonlinear data as shown in FIG. 24, for example, all linear graphs in this range are moved from top to bottom. The non-linear consumption correction data may be set so as to intersect. Further, the consumption correction data does not necessarily need to be monotonic with respect to the number of pulses, and may be set so that the consumption correction length has an extreme value with respect to the number of pulses as shown in FIG. 25, for example.

Further, in the above-described embodiment, only one example is shown as the wear correction data, but different wear correction data may be used for each processing condition used, or the electrode correction length data may be used as the wear correction data. Instead, electrode correction volume data and electrode longitudinal direction projected area storage means may be provided and the electrode correction length data may be calculated. Further, instead of the consumption correction data for the number of discharge pulses, the consumption correction data for other information obtained during machining such as the machining current integrated value as shown in the fifth embodiment may be used. Furthermore, the position of the equilibrium operating point has a great effect on the machining depth,
If the consumption correction data is changed according to the machining depth, machining with good depth accuracy can be realized.

In the above description of the embodiments, some specific examples of the wear correction length determining means, the measurement period setting means, and the electrode wear compensating means have been described, but the wear correction length determining means, the measurement period setting means. The combination of the electrode consumption compensating means is not limited to the combination described in the above specific examples, and for example, as the consumption correction length determining means, the consumption correction data, the discharge pulse counting means 17, and the consumption correction length calculating means 1 are used.
8. Electrode moving distance measuring means 1 as measuring period setting means
6, electrode longitudinal movement means 14 as electrode wear compensation means
May be used in any combination to form the device.

Further, in all the above-mentioned embodiments, the control device 4 moves the electrode 1 according to the electrode trajectory data 5, and the work 2 is processed in a fixed state. It does not mean that only the work piece is moved, and that the work piece may be moved at the same time so that the relative position between the work piece and the electrode 1 substantially follows the electrode trajectory data 5. further,
In all of the above-mentioned embodiments, the electrode track data 5 does not take into consideration the electrode wear, but it is processed by using the corrected electrode track data 7 shown in the conventional wear correction type simple electrode electric discharge machine, and the corrected electrode track is obtained. The consumption compensation operation may be performed by the difference between the electrode consumption length predicted in the data 7 and the electrode consumption correction length detected by the number of pulses.

[0110]

In the electric discharge machining apparatus according to the first aspect of the present invention, the electrode wear correction length per one discharge pulse is obtained by the unit wear correction length determining means, and the discharge occurrence detecting means detects the occurrence of the discharge. Each time the electrode wear compensation means performs the electrode wear compensation operation in the longitudinal direction of the electrode according to the electrode wear correction length, it is not necessary to generate the corrected electrode trajectory data considering the electrode wear, and the machining is simplified. There is an effect that it can be performed.

In the electric discharge machining apparatus according to claim 2 of the present invention, the measurement period setting means determines a period for obtaining the information correlating with the electrode wear amount, and the consumption correction length determining means determines the information obtained during this period. Since the electrode wear correction length is obtained from the electrode wear compensation means and the electrode wear compensation length is adjusted according to the electrode wear compensation length, it is not necessary to generate the corrected electrode trajectory data considering the electrode wear.
An effect that processing can be performed easily is exhibited.

According to the third aspect of the present invention, the electric discharge machining apparatus uses the consumption correction data representing the relationship between the number of discharge pulses and the electrode consumption correction amount, and the unit consumption correction length calculation means calculates the consumption per discharge pulse. Since the corrected length is calculated, there is an effect that it is not necessary to generate corrected electrode trajectory data in consideration of electrode consumption before processing.

In the electric discharge machine according to claim 4 of the present invention, the unit wear correction length determining unit calculates the electrode wear correction length per discharge pulse, and the unit wear correction length integrating unit calculates the unit electrode wear correction. Since the lengths are integrated, there is an effect that it is not necessary to generate corrected electrode trajectory data in consideration of electrode consumption before processing.

An electric discharge machine according to a fifth aspect of the present invention counts the number of electric discharge pulses generated by the electric discharge pulse counting means, and represents the relationship between the counted number of electric discharge pulses, the number of electric discharge pulses, and the electrode wear correction amount. Since the electrode wear correction length is calculated from the wear correction data by the wear correction length calculation means, it is not necessary to generate the corrected electrode trajectory data considering the electrode wear prior to the machining, and the machining can be performed easily. It has the effect of being able to.

In the electric discharge machining apparatus according to claim 6 of the present invention, the machining current is integrated by the machining current integrating means, and the consumption current correction value indicating the relationship between the machining current integral value, the machining current integral value, and the electrode wear correction amount. Since the electrode wear correction length calculation unit calculates the electrode wear correction length from the above, it is not necessary to generate the corrected electrode trajectory data in consideration of the electrode wear prior to the processing, and the processing can be easily performed. Play.

The electric discharge machining apparatus according to the seventh aspect of the present invention has an effect that the unit electrode wear data defining the electrode wear correction volume per discharge pulse is held by the wear correction data.

In the electric discharge machine according to the eighth aspect of the present invention, the unit current electrode wear data defining the electrode wear correction volume per unit machining current integral value is held by the wear correction data.

The electric discharge machine according to claim 9 of the present invention has an effect that the projected area in the longitudinal direction of the electrode is stored by the projected area in the electrode longitudinal direction storage means.

The electric discharge machine according to the tenth aspect of the present invention has the effect that the projection area in the electrode longitudinal direction and the electrode wear correction length are defined in an inversely proportional relationship by the wear correction data.

According to the eleventh aspect of the present invention, there is an effect that the electrode moving distance measuring means can detect that the relative moving distance of the electrode and the workpiece exceeds a certain distance.

According to the twelfth aspect of the present invention, there is an effect that the correction position storage means can detect that the relative position of the electrode and the workpiece reaches a predetermined position.

The electric discharge machining apparatus according to the thirteenth aspect of the present invention has the effect of being able to detect the elapse of a certain period of time by the timing means.

According to the fourteenth aspect of the present invention, there is an effect that the constant pulse number detecting means can detect that the number of discharge pulses exceeds a predetermined pulse number.

According to the fifteenth aspect of the present invention, there is an effect that the discharge pulse detecting means can detect the occurrence of the discharge pulse.

In the electric discharge machining apparatus according to the sixteenth aspect of the present invention, the maximum allowable discharge pulse number is calculated from the preset maximum allowable electrode wear correction length and the preset wear data by the electrode wear correction length pulse number conversion means. The constant pulse number detecting means can detect that the number of discharge pulses exceeds the maximum allowable number of discharge pulses.

According to the seventeenth aspect of the present invention, there is an effect that the constant electrode wear correction length detecting means can detect that the wear correction length exceeds a certain length.

According to the eighteenth aspect of the present invention, in the electric discharge machining apparatus, the electrode longitudinal direction moving means, whose relative position to the workpiece is controlled according to the predetermined trajectory data, causes the electrode to be depleted according to the electrode wear correction length. The effect of moving in the longitudinal direction is achieved.

In the electric discharge machining apparatus according to claim 19 of the present invention, the electrode wear correction length integration means integrates the electrode wear correction length within the measurement period, and the electrode longitudinal direction position addition means adds the electrode trajectory data in the longitudinal direction. Since this integrated electrode wear correction length is added to the data and output, it is not necessary to generate corrected electrode trajectory data that takes into account electrode wear prior to machining, and machining can be performed easily. Play.

In the electric discharge machining apparatus according to claim 20 of the present invention, the movement of the electrode according to the trajectory data is interrupted by the consumption correction machining control means, and the electrode longitudinal movement corresponding to the electrode consumption correction length is performed. Produce an effect.

Since the electric discharge machining apparatus according to the twenty-first aspect of the present invention uses the electric discharge machining condition in which the electrode wear is smaller than that in the machining according to the electrode trajectory data, the change in the electrode shape at the time of the wear correction machining is performed. The effect is that it can be prevented.

According to a twenty-second aspect of the present invention, in the electric discharge machining apparatus, the electrode wear-correction length calculation means calculates the total electrodes from the information and wear correction data obtained by the means for adding information obtained over a plurality of measurement periods. Since the consumption correction length is calculated, it is not necessary to generate the corrected electrode trajectory data in consideration of electrode consumption prior to the processing, and the processing can be easily performed.

In the electric discharge machining apparatus according to the twenty-third aspect of the present invention, since the discharge pulse can be discriminated by the discharge state discriminating means as at least one of the short-circuit pulse and the normal discharge pulse, even if the electric discharge state deteriorates, There is an effect that the amount of electrode wear can be measured and the wear compensation operation can be appropriately performed.

In the electric discharge machine according to the twenty-fourth aspect of the present invention, the discharge state judging means can judge the discharge pulse to be at least one of a short circuit pulse, a normal discharge pulse, an open pulse and an abnormal discharge pulse. Therefore, there is an effect that the electrode consumption can be corrected more accurately, and more highly accurate machining can be realized.

According to the twenty-fifth aspect of the present invention, in the electric discharge machining apparatus, the minimum electrode length compensation means measures the minimum electrode electrode consumption compensation length for starting the electrode compensation operation set in advance. Since the electrode wear compensation operation is performed only when the wear correction length is larger than the predetermined value, the wear compensation operation is omitted when the wear correction length is equal to or less than a certain value, and efficient machining can be performed without lowering machining accuracy. Produce an effect.

In the electric discharge machining apparatus according to the twenty-sixth aspect of the present invention, since the compensating operation is performed by the machining condition change detecting means even when the machining condition is changed, an accurate electrode can be used for any machining. The effect is that the wear length can be calculated.

In the electric discharge machining apparatus according to the twenty-seventh aspect of the present invention, since the wear correction data is defined by the non-linear relationship between the information obtained during machining and the wear correction length, there is an error in the estimation of the electrode wear length. Even if there is, the effect that the processing depth does not diverge and stable processing is possible.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram showing a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram showing a sixth embodiment of the present invention.

FIG. 7 is a configuration diagram showing a seventh embodiment of the present invention.

FIG. 8 is a configuration diagram showing an eighth embodiment of the present invention.

FIG. 9 is a configuration diagram showing a ninth embodiment of the present invention.

FIG. 10 is a configuration diagram showing a tenth embodiment of the present invention.

FIG. 11 is a configuration diagram showing an eleventh embodiment of the present invention.

FIG. 12 is a configuration diagram showing an embodiment 12 of the present invention.

FIG. 13 is a configuration diagram showing Embodiment 13 of the present invention.

FIG. 14 is a configuration diagram showing Embodiment 14 of the present invention.

FIG. 15 is a configuration diagram showing an embodiment 15 of the present invention.

FIG. 16 is a configuration diagram showing Embodiment 16 of the present invention.

FIG. 17 is an operation explanatory diagram of the fourth embodiment when there is no error in the consumption correction data.

FIG. 18 is a characteristic diagram of the true electrode wear length and the wear correction length with respect to the number of discharge pulses when the wear correction data has an error.

FIG. 19 is an operation explanatory diagram of the fourth embodiment when the consumption correction data has an error.

FIG. 20 is a configuration diagram showing Embodiment 17 of the present invention.

FIG. 21 is a diagram showing an example of wear correction data in Embodiment 17 of the present invention.

FIG. 22 is a diagram showing another example of wear correction data according to the seventeenth embodiment of the present invention.

FIG. 23 is a diagram showing another example of wear correction data according to the seventeenth embodiment of the present invention.

FIG. 24 is a diagram showing another example of wear correction data according to the seventeenth embodiment of the present invention.

FIG. 25 is a diagram showing another example of wear correction data according to the seventeenth embodiment of the present invention.

FIG. 26 is a configuration diagram of a conventional predictive correction type simple electrode electric discharge machining apparatus.

[Explanation of symbols]

1 electrode, 2 work, 3 machining power supply, 4 control device,
5 electrode orbit data, 6 orbit correction unit, 7 corrected electrode orbit data, 8 unit electrode wear correction volume data, 9 electrode longitudinal projected area storage means, 10 discharge pulse detection means, 11 unit wear correction length calculation means, 12 electrodes Consumption correction length integrating means, 13 electrode longitudinal direction position adding means,
14 electrode longitudinal direction moving means, 15 unit consumption correction length integrating means, 16 electrode moving distance measuring means, 17 discharge pulse counting means, 18 consumption correction length calculating means, 19 machining current integrating means, 20 unit current electrode wear correction volume Data, 21 consumption correction processing control means, 22 correction position storage means, 23 timing means, 24 constant pulse number detection means, 25
Electrode consumption correction length pulse number conversion means, 26 constant electrode consumption correction length detection means, 27 total discharge pulse counting means,
28 discharge state determination means, 29 normal discharge pulse counting means, 30 short circuit pulse counting means, 31 minimum correction length guaranteeing means, 32 machining condition change detecting means, 33 true electrode wear length, 34 wear correction length, 35 non-linear Wear correction data, 36 The range in which the true electrode wear length exists.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hidetaka Miyake 8-1-1 Tsukaguchihonmachi, Amagasaki City Mitsubishi Electric Corporation Industrial Systems Research Laboratories (72) Inventor Takuji Maji 5-1-1 Yada Minami, Higashi-ku, Nagoya Mitsubishi Electric Co., Ltd. Nagoya Works (72) Inventor Akihiro Goto 5-14 Yanda Minami 5-chome, Higashi-ku, Nagoya City Mitsubishi Electric Co., Ltd. Nagoya Works

Claims (27)

[Claims] 1. An electric discharge machining apparatus for machining while controlling the relative position of a machining electrode and a workpiece according to predetermined orbit data, a means for detecting the occurrence of electric discharge, and an electrode consumption correction per one pulse of electric discharge. A unit consumption correction length determining means for determining the length,
An electric discharge machining apparatus comprising: an electrode wear compensating means for performing a wear compensating operation in a longitudinal direction of an electrode according to the electrode wear correction length each time an occurrence of a discharge is detected. 2. In an electric discharge machining apparatus for machining while controlling the relative position of a machining electrode and a workpiece according to predetermined trajectory data, a period for obtaining information correlating with the amount of electrode wear during machining is determined. A measurement period setting means, a wear correction length determining means for obtaining an electrode wear correction length using the information acquired during the measurement period, and an electrode according to the electrode wear correction length obtained by the wear correction length determining means. An electric discharge machining apparatus comprising an electrode wear compensation means for performing wear compensation operation in a longitudinal direction. 3. The electric discharge machining apparatus according to claim 1, wherein the unit wear correction length determination means uses the wear correction data indicating the relationship between the number of discharge pulses and the electrode wear correction amount, and discharges using the wear correction data. An electric discharge machine comprising a unit wear correction length calculation means for calculating a wear correction length per pulse. 4. The electric discharge machining apparatus according to claim 2, wherein the wear correction length determining means calculates a unit wear correction length determining means for calculating an electrode wear correction length per discharge pulse, and the unit electrode wear correction. An electric discharge machine comprising a unit wear correction length integrating means for integrating lengths. 5. The electric discharge machining apparatus according to claim 2, wherein the wear correction length determining means counts the number of generated discharge pulses, and wear correction representing a relationship between the number of discharge pulses and an electrode wear correction amount. An electric discharge machining apparatus comprising: a data, the consumption correction data, and a consumption correction length calculation means for calculating an electrode consumption correction length using the number of discharge pulses. 6. The electric discharge machining apparatus according to claim 2, wherein the wear correction length determining means includes means for integrating a working current, and wear correction data representing a relationship between a machining current integrated value and an electrode wear correction amount. An electric discharge machining apparatus comprising: a wear correction length calculating means for calculating an electrode wear correction length using the wear correction data and the machining current integral value. 7. The electric discharge machining apparatus according to claim 3, wherein the consumption correction data includes unit electrode consumption data defining an electrode consumption correction volume per discharge pulse. . 8. The electric discharge machining apparatus according to claim 6, wherein the wear correction data includes unit current electrode wear data defining an electrode wear correction volume per unit machining current integral value. 9. The electric discharge machine according to claim 3, 5, or 6, wherein the wear correction data has a unit for storing a projected area in the longitudinal direction of the electrode. 10. The electric discharge machining apparatus according to claim 3, 5 or 6, wherein the consumption correction data has an inversely proportional relationship between the electrode longitudinal projection area and the electrode consumption correction length. Processing equipment. 11. The electric discharge machining apparatus according to claim 2, wherein the measurement period setting means has an electrode moving distance measuring means for detecting that the relative moving distance of the electrode and the workpiece exceeds a certain distance. EDM equipment. 12. The electric discharge machining apparatus according to claim 2, wherein the measurement period setting means has a correction position storage means for detecting that the relative position of the electrode and the workpiece has reached a predetermined position. And electrical discharge machine. 13. The electric discharge machine according to claim 2, wherein the measuring period setting means has a time measuring means for detecting the passage of a fixed time. 14. The electric discharge machine according to claim 2, wherein the measurement period setting means has a constant pulse number detecting means for detecting that the number of generated discharge pulses exceeds a certain number of pulses. Processing equipment. 15. The electric discharge machine according to claim 2, wherein the measuring period setting means has a discharge pulse detecting means for detecting generation of a discharge pulse. 16. The electric discharge machining apparatus according to claim 2, wherein the measurement period setting means calculates a maximum allowable discharge pulse number from a preset maximum allowable electrode wear correction length and the wear correction data. An electric discharge machining apparatus comprising: a pulse number converting means; and a constant pulse number detecting means for detecting that the discharge pulse number exceeds the maximum allowable discharge pulse number. 17. The electric discharge machining apparatus according to claim 2, wherein the measurement period setting means has constant electrode wear correction length detecting means for detecting that the wear correction length exceeds a certain length. Electric discharge machine. 18. The electric discharge machining apparatus according to claim 1 or 2, wherein the electrode wear compensating means controls a relative position with respect to the workpiece according to predetermined trajectory data, and adjusts the electrode wear correction length. Therefore, the electric discharge machining apparatus is provided with an electrode longitudinal direction moving means for moving the electrode in the longitudinal direction. 19. The electric discharge machining apparatus according to claim 1 or 2, wherein the electrode wear compensation means includes an electrode wear correction length integration means for integrating electrode wear correction lengths within a measurement period, and electrode orbit data. An electric discharge machining apparatus comprising: an electrode longitudinal direction position addition means for adding and outputting an accumulated electrode wear correction length for longitudinal direction data. 20. The electric discharge machining apparatus according to claim 1 or 2, wherein the electrode wear compensating means interrupts the movement of the electrode according to the trajectory data and moves in the electrode longitudinal direction corresponding to the electrode wear correction length. An electric discharge machining apparatus comprising a consumption correction machining control means for performing the above. 21. The electric discharge machining apparatus according to claim 20, wherein during the electrode wear compensation operation, an electric discharge machining condition that causes less electrode wear than when performing machining according to the electrode trajectory data is used. 22. The electric discharge machining apparatus according to claim 2, wherein the wear correction length determining means uses means for adding up information acquired over a plurality of measurement periods, and information and wear correction data added up by the means. An electric discharge machine comprising: means for calculating a total electrode wear correction length. 23. The electric discharge machining apparatus according to claim 1 or 2, wherein the unit wear correction length determining means or the wear correction length determining means has at least a short circuit pulse or a normal discharge pulse as a discharge pulse. An electric discharge machining apparatus comprising: an electric discharge state judging means for judging whether or not the electric discharge machining apparatus has a structure. 24. The electric discharge machine according to claim 23, wherein the electric discharge state judging means judges at least one of an abnormal electric discharge pulse and an open pulse. 25. The electric discharge machining apparatus according to claim 1 or 2, wherein the electrode wear compensation means has a minimum electrode wear compensation whose measured electrode wear compensation length starts a preset electrode compensation operation. An electric discharge machining apparatus having a minimum correction length guaranteeing means for performing an electrode wear compensation operation only when the length is larger than the length. 26. The electric discharge machining apparatus according to claim 2, wherein the measurement period setting means has a means for detecting a change in the machining condition, and performs the compensation operation even when the machining condition is changed. And electrical discharge machine. 27. The electric discharge machine according to claim 5 or 6, wherein the wear correction data includes data obtained during machining and data in which the wear correction length has a non-linear relationship. apparatus.