Measurement method and device for electric spark machining discharge gap, medium and program product

Abstract

The invention discloses a measuring method and device for an electric spark machining discharge gap, a medium and a program product, and relates to the technical field of electric spark machining. The method comprises the following steps: acquiring the discharge state of each pulse of a plurality of groups of discharge pulse sequences emitted by a pulse power supply at a corresponding gap measurement point; each group of discharge pulse sequence corresponds to one gap measurement point; the gap measuring point is used for representing the distance between the electrode and the machined workpiece after the electrode moves towards the machined workpiece by a preset distance every time in the electric spark machining process; calculating the discharge probability of a group of discharge pulse sequences corresponding to each gap measurement point according to the discharge state; and according to the discharge probability, a target gap of electrical discharge machining discharge is determined. By determining the target gap, the machining gap can be kept at the optimal discharge gap during electric spark machining, and therefore the quality and efficiency of electric spark machining are improved.

Description

Technical Field

[0001] The invention relates to the technical field of electric spark machining, and in particular to a method, a device, a medium and a program product for measuring a discharge gap in electric spark machining. Background Art

[0002] Electrical Discharge Machining (EDM) refers to a processing method that uses the electrical erosion phenomenon during pulsed spark discharge between two electrodes (tool electrode and workpiece electrode) in a medium to process materials so that the size, shape and surface quality of the parts meet the predetermined requirements.

[0003] The existing technology can only measure the "average discharge gap" under the current machining conditions, but cannot reflect the distribution range of the entire discharge gap, so it is impossible to determine the optimal discharge gap, which makes the quality and efficiency of EDM need to be improved. Summary of the invention

[0004] The purpose of the present invention is to provide a method, device, medium and program product for measuring the discharge gap of electrospark machining, which can keep the machining gap at an optimal discharge gap during electrospark machining, thereby improving the quality and efficiency of electrospark machining.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] One aspect of the present invention provides a method for measuring the discharge gap of electrospark machining, the method comprising: obtaining the discharge state of each pulse of a plurality of discharge pulse sequences emitted by a pulse power supply at a corresponding gap measurement point; each discharge pulse sequence corresponds to a gap measurement point; the gap measurement point is used to characterize the distance between the electrode and the workpiece being machined after the electrode moves a preset distance toward the workpiece during the electrospark machining process each time; according to the discharge state, calculating the discharge probability of a set of discharge pulse sequences corresponding to each gap measurement point; and determining the target gap of the electrospark machining discharge according to the discharge probability.

[0007] According to an embodiment of the present invention, the method also includes: obtaining the short-circuit probability of each discharge pulse of multiple groups of discharge pulse sequences emitted by the pulse power supply at the corresponding gap measurement point; when the short-circuit probability reaches a preset threshold, obtaining a relationship curve between the discharge probability and the gap measurement point; the horizontal axis of the relationship curve is the gap, and the vertical axis is the discharge probability.

[0008] According to an embodiment of the present invention, the gap corresponding to the gap measurement point at the starting point of the relationship curve between the discharge probability and the gap measurement point is a preset gap, and the corresponding discharge probability is 0%; the gap corresponding to the gap measurement point at the end point of the relationship curve between the discharge probability and the gap measurement point is a gap when the short circuit probability is 100%, and the corresponding discharge probability is 0%; wherein, when the gap is larger than the gap corresponding to the gap measurement point at the starting point of the relationship curve between the discharge probability and the gap measurement point and smaller than the gap corresponding to the gap measurement point at the end point of the relationship curve between the discharge probability and the gap measurement point, the discharge probability corresponding to the gap is greater than 0.

[0009] According to an embodiment of the present invention, the target gap of the EDM discharge is determined based on the discharge probability, including: when the discharge probability is 100%, the corresponding gap measurement value of the EDM discharge is determined, and the corresponding gap value of the EDM discharge is used as the target gap of the EDM discharge.

[0010] According to an embodiment of the present invention, the discharge probability of a set of discharge pulse sequences corresponding to each gap measurement point is calculated according to the discharge state, including: determining the number of discharge pulses that generate spark discharges in a set of discharge pulse sequences according to the discharge state; and determining the discharge probability according to the number of discharge pulses that generate spark discharges and the total number of discharge pulses in a set of discharge pulse sequences.

[0011] According to an embodiment of the present invention, the difference between the gap measurement point corresponding to the current moment and the gap measurement point corresponding to the next moment is a preset distance.

[0012] Another aspect of the present invention provides a device for measuring the discharge gap of electrospark machining, which applies the above-mentioned method for measuring the discharge gap of electrospark machining, and the device includes: an acquisition module, which is used to obtain the discharge state of each pulse of a plurality of discharge pulse sequences emitted by a pulse power supply at the corresponding gap measurement point; each group of discharge pulse sequences corresponds to a gap measurement point; the gap measurement point is used to characterize the distance between the electrode and the workpiece being machined after the electrode moves a preset distance toward the workpiece during the electrospark machining process each time; a calculation module, which is used to calculate the discharge probability of a group of discharge pulse sequences corresponding to each gap measurement point according to the discharge state; and a target determination module, which is used to determine the target gap of the electrospark machining discharge according to the discharge probability.

[0013] Another aspect of the present invention provides an electronic device, comprising:

[0014] one or more processors;

[0015] a memory for storing one or more programs,

[0016] When the one or more programs are executed by the one or more processors, the one or more processors implement the above method.

[0017] Another aspect of the present invention provides a computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, enables the processor to implement the above method.

[0018] Another aspect of the present invention provides a computer program product, comprising a computer program, wherein the computer program implements the above method when executed by a processor.

[0019] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0020] The present invention provides a method, device, medium and program product for measuring the discharge gap of electric spark machining, which obtains the discharge state of each pulse of multiple groups of discharge pulse sequences emitted by a pulse power supply at the corresponding gap measurement point; wherein each group of discharge pulse sequences corresponds to a gap measurement point; the gap measurement point is used to characterize the distance between the electrode and the workpiece being machined after the electrode moves a preset distance to the workpiece during the electric spark machining process; then, according to the discharge state, the discharge probability of a group of discharge pulse sequences corresponding to each gap measurement point is calculated; and according to the discharge probability, the target gap of the electric spark machining discharge is determined. By determining the target gap, the machining gap can be kept at the optimal discharge gap during the electric spark machining, thereby improving the quality and efficiency of the electric spark machining. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the structure of the electric spark machining device;

[0023] Figure 2 It is a schematic diagram of voltage waveform and current waveform corresponding to five discharge states between spark discharge electrodes;

[0024] Figure 3 It is a schematic diagram of the distribution range of the relationship between the discharge gap and the spark discharge rate;

[0025] Figure 4 A schematic flow chart of a method for measuring a discharge gap in an electrospark machining process provided by the present invention;

[0026] Figure 5A schematic diagram of the measurement steps of the discharge gap in electrospark machining provided by the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] One of the necessary conditions for achieving EDM is that a certain gap must be maintained between the tool electrode and the workpiece electrode during the machining process. This gap is called the "discharge gap", such as Figure 1 Therefore, the discharge gap is the distance between the electrodes that can be used for discharge machining when a certain pulse voltage is applied between the electrode and the workpiece.

[0029] Since the discharge gap in the EDM process is very small (usually a few microns to hundreds of microns) and is constantly changing, it is difficult to directly measure the gap value. Indirect measurement methods are generally used. The discharge state between the electrodes of the EDM discharge is generally divided into five types: Figure 2 As shown: (1) no-load or open circuit state; (2) spark discharge; (3) short circuit; (4) arc discharge (stable arc discharge); (5) transition arc discharge (unstable arc discharge).

[0030] The discharge state between electrodes can reflect the size of the gap to a certain extent. Generally speaking, if the discharge gap is too large, the no-load rate is high, the spark discharge rate is low, and the processing efficiency is low; as the discharge gap decreases, the spark discharge rate also increases; but when the discharge gap decreases to a certain extent, the arc discharge rate and short circuit rate will gradually increase, and the spark discharge rate will also decrease. The relationship between the discharge gap and the spark discharge rate is distributed as follows: Figure 3 shown.

[0031] Since the size of the discharge gap is related to the discharge characteristics of EDM, it plays an important reference role in the design of the servo feed system of the EDM machine tool machining gap. Therefore, efficient, high-precision, economical and reliable discharge gap measurement technology is of great value to the research and application of EDM.

[0032] After searching the literature of the prior art, it was found that there are two invention patents on the measurement method of the discharge gap, which are described as follows: (1) Patent No. CN101229622B, invention name: "Method for measuring the critical discharge gap", this method finds (measures) the critical discharge gap by observing "whether there is a discharge mark". This method is simple and easy to implement, but it requires the observation and judgment of the human eye and has a certain degree of subjectivity; in addition, this method can only measure the "critical discharge gap" and cannot reflect the distribution range of the entire discharge gap, so this measurement method has great limitations. (2) Patent No. CN101249617A, invention name: "Method for measuring the discharge machining gap", this method uses the electrode to perform actual discharge machining on the workpiece to a certain depth for testing, and measures the electrode machining depth d1, virtual machining depth d2 and electrode consumption S-Z0 respectively, thereby obtaining the discharge machining gap: d2-d1+S-Z0. This method actually requires many parameters to be measured, and the data measured by the contact sensing method is not accurate enough; in addition, this method can only measure the "average discharge gap" under the current machining conditions, and cannot reflect the distribution range of the entire discharge gap, so this measurement method also has certain limitations. Therefore, there is an urgent need for a method to measure the discharge gap of EDM, which can accurately measure the distribution range of the entire discharge gap, especially the "critical discharge gap" and "optimal discharge gap", which has extremely important practical application value and theoretical significance for the study of gap discharge characteristics in EDM and the design of EDM gap servo control algorithm.

[0033] The purpose of the present invention is to provide a method, device, medium and program product for measuring the discharge gap of electric spark machining, aiming to keep the machining gap at the optimal discharge gap during electric spark machining, thereby improving the quality and efficiency of electric spark machining. This is of great value for the research and application of electric spark machining.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Example 1

[0036] like Figure 4 As shown, the method for measuring the discharge gap of the electric spark machining in this embodiment includes:

[0037] Step S1: Obtain the discharge state of each pulse of a plurality of discharge pulse sequences emitted by a pulse power source at a corresponding gap measurement point; each discharge pulse sequence corresponds to a gap measurement point; the gap measurement point is used to characterize the distance between the electrode and the workpiece being processed after the electrode moves a preset distance toward the workpiece during each electrospark machining process.

[0038] Specifically, the difference between the gap measurement point corresponding to the current moment and the gap measurement point corresponding to the next moment is a preset distance.

[0039] Step S2: Calculate the discharge probability of a set of discharge pulse sequences corresponding to each gap measurement point according to the discharge state.

[0040] S2 specifically includes:

[0041] Step S21: determining the number of discharge pulses for generating spark discharge in a set of discharge pulse sequences according to the discharge state.

[0042] Step S22: determining the discharge probability according to the number of discharge pulses generating spark discharge and the total number of discharge pulses in a set of discharge pulse sequences.

[0043] Step S3: Determine the target gap of the EDM discharge according to the discharge probability.

[0044] Specifically, when the discharge probability is 100%, the corresponding gap measurement value of the electric discharge machining discharge is determined, and the corresponding gap measurement value of the electric discharge machining discharge is used as the target gap of the electric discharge machining discharge.

[0045] As a specific implementation, the method for measuring the discharge gap of the electrospark machining also includes:

[0046] The short-circuit probability of each discharge pulse of the multiple groups of discharge pulse sequences emitted by the pulse power supply at the corresponding gap measurement point is obtained; when the short-circuit probability reaches a preset threshold, a relationship curve between the discharge probability and the gap measurement point is obtained; the abscissa of the relationship curve is the gap, and the ordinate is the discharge probability.

[0047] When the short circuit probability reaches a preset threshold, which is about 100%, it means the gap is 0, the measurement ends, and a relationship curve between the discharge probability and the gap measurement point is obtained; the abscissa of the relationship curve is the gap, and the ordinate is the discharge probability.

[0048] Further, the gap corresponding to the gap measurement point at the starting point of the relationship curve between the discharge probability and the gap measurement point is a preset gap, and the corresponding discharge probability is 0%; the gap corresponding to the gap measurement point at the end point of the relationship curve between the discharge probability and the gap measurement point is the gap when the short circuit probability is 100%, and the corresponding discharge probability is 0%; wherein, when the gap corresponding to the gap measurement point is larger than the gap corresponding to the gap measurement point at the starting point of the relationship curve between the discharge probability and the gap measurement point and smaller than the gap corresponding to the gap measurement point at the end point of the relationship curve between the discharge probability and the gap measurement point, the discharge probability corresponding to the gap measurement point is greater than 0.

[0049] In practical applications, such as Figure 5 As shown, the specific application process of the method for measuring the discharge gap of electrospark machining provided by the present invention is as follows:

[0050] Step 1: Perform preparation work, including:

[0051] (1) The electrode and workpiece surfaces must have a certain degree of flatness; (2) Workpiece installation and fixation: During installation, the workpiece plane must be kept parallel to the XOY plane and clamped; (3) Adjust the Z-axis feed toward the workpiece until there is a suitable gap between the electrode and the workpiece. This gap must be outside the range that can generate spark discharge. The empirical value is about 1 mm between the electrode and the workpiece.

[0052] Step 2: The computer control module issues a command to let the pulse power supply send out a group of discharge pulses. The discharge gap state detection module can synchronously detect the discharge state of each pulse and output it to the computer data processing module. The computer data processing module performs statistical calculations on the state of the group of discharge pulse sequences in real time to obtain the discharge probability percentage, which is recorded as φ.

[0053] In practical applications, the discharge gap state detection module detects the current and voltage values ​​of the discharge between the electrode and the workpiece. Figure 2 The waveform diagram of the current value and voltage value shown determines the discharge state of each pulse.

[0054] Step 3: From the first time that the computer data processing module counts that the probability percentage of normal spark discharge is greater than 0 (i.e., it recognizes that the state has changed from the open circuit state to the normal spark discharge state), the computer control module issues a motion control instruction to move the X-axis (or Y-axis) horizontally by one displacement unit. The purpose of this step is to avoid the influence of the erosion marks of the workpiece on the discharge gap measurement after the normal discharge occurs.

[0055] Step 4: The computer control module controls the Z-axis servo feed motion to move the electrode toward the workpiece by a small feed amount δ, for example, the feed amount is 0.001 mm.

[0056] Step 5: The computer control module repeats the process of step 2 to step 4 in a cycle until the probability percentage of the short circuit state is 100%, at which time the discharge gap is about 0 mm. The total number of times is recorded as n.

[0057] Step 6: The computer data processing module comprehensively processes the number of steps, step distance and discharge probability percentage sequence recorded in step 3 to obtain: the relationship curve between the discharge probability percentage and the feed displacement, that is, the distribution range of the discharge gap (starting from the beginning of spark discharge - the spark discharge state percentage is greater than 0, and ending at the short circuit state percentage of 100%).

[0058] As a specific implementation method, the implementation plan of the XYZ axis three-dimensional motion platform, considering the low-cost application requirements, can use a stepper motor or a servo motor to drive the ball screw-nut workbench. To ensure the accuracy of single-step operation, a high-resolution grating ruler can be installed on the workbench to form a closed-loop system. In particular, in order to further improve the accuracy of operation, without considering the cost, a linear motor can be used to construct the XYZ axis three-dimensional motion platform.

[0059] Since the present invention measures the discharge characteristics (distribution law) of the entire discharge gap interval, it is easy to observe the "critical" discharge gap and the "optimal" discharge gap, where the critical discharge gap refers to the gap value corresponding to the beginning of spark discharge, and the optimal discharge gap refers to the gap value corresponding to the maximum spark discharge percentage. Compared with the prior art, the present invention has the following advantages:

[0060] (1) Intelligence: The discharge gap state detection module can sample the state of a single discharge pulse in real time, and the computer data processing module statistically analyzes the discharge probability percentage of a sampling period to record the discharge characteristics under the discharge gap.

[0061] (2) High efficiency: During the measurement of the discharge gap, the system automatically completes N cycles of sampling, data statistics and recording, step motion control and other operations, with high operating efficiency.

[0062] (3) High precision: The discharge gap state detection module ensures the accuracy of discharge characteristic measurement, and the high-precision servo motion control ensures the high precision of single-step displacement.

[0063] Example 2

[0064] The present invention also provides a device for measuring the discharge gap of an electric spark machining process, and applies the method for measuring the discharge gap of an electric spark machining process provided in Example 1. The device includes an acquisition module, a calculation module, and a target determination module.

[0065] An acquisition module is used to acquire the discharge state of each pulse of a plurality of discharge pulse sequences emitted by a pulse power source at a corresponding gap measurement point; each discharge pulse sequence corresponds to a gap measurement point; the gap measurement point is used to characterize the distance between the electrode and the workpiece being processed after the electrode moves a preset distance toward the workpiece each time during the electrospark machining process.

[0066] The calculation module is used to calculate the discharge probability of a group of discharge pulse sequences corresponding to each gap measurement point according to the discharge state.

[0067] The target determination module is used to determine the target gap of the electric spark machining discharge according to the discharge probability.

[0068] In practical applications, the device for measuring the discharge gap of an electric spark machining provided by the present invention further comprises a pulse power supply module, a discharge gap state detection module, a servo feed module and a control module. The device for measuring the discharge gap of an electric spark machining is a computer provided with an acquisition module, a calculation module and a target determination module. The specific application process is as follows:

[0069] The method of successive discharge probability sampling and step control is adopted. In each determined time period T, the control module issues an instruction to let the pulse power supply send a group of discharge pulses. The discharge gap state detection module can synchronously detect the discharge state of each pulse, and the acquisition module obtains the discharge state of each pulse. The calculation module performs statistical calculations on the state of the group of discharge pulse sequences in real time to obtain the discharge probability percentage. Each time the discharge probability percentage under the current discharge gap is completed, the control module controls the servo feed movement to move the electrode toward the workpiece by a small feed amount δ (for example: 0.001mm). At this point, a cycle of step sampling and control is completed, and the cycle is repeated in sequence until the short-circuit state probability percentage is 100%. After the cycle is completed, the target determination module can obtain the relationship curve between the discharge probability percentage and the feed displacement according to the discharge probability of each cycle, which is the "discharge gap distribution interval" (starting from the beginning of spark discharge--the spark discharge state percentage is greater than 0, and ending at the short-circuit state percentage is 100%). From this discharge gap distribution interval, not only the critical discharge gap can be conveniently obtained, but also the optimal discharge gap can be obtained, and the optimal discharge gap is the target gap. The measurement of the discharge gap is of great value to the research and application of electrospark machining.

[0070] Example 3

[0071] The present invention provides an electronic device, comprising: one or more processors; and a memory for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the method described in Example 1.

[0072] Example 4

[0073] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the method for measuring the discharge gap of electric spark machining in embodiment 1.

[0074] Example 5

[0075] A computer program product includes a computer program, which implements the method for measuring the discharge gap of electric spark machining in embodiment 1 when executed by a processor.

[0076] Example 6

[0077] A computer device, which may be a database. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected via a system bus, and the communication interface is connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store pending transactions. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, the method for measuring the discharge gap of the electric spark machining in Example 1 is implemented.

[0078] It should be noted that the object information (including but not limited to object device information, object personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in the present invention are all information and data authorized by the object or fully authorized by all parties, and the collection, use and processing of relevant data need to comply with relevant laws, regulations and standards of relevant countries and regions.

[0079] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided by the present invention can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided by the present invention may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited thereto. The processor involved in each embodiment provided by the present invention may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited thereto.

[0080] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for measuring the discharge gap of an electrospark machining process, characterized in that: The method comprises: Obtaining the discharge state of each pulse of a plurality of discharge pulse sequences emitted by a pulse power source at a corresponding gap measurement point; each discharge pulse sequence corresponds to a gap measurement point; the gap measurement point is used to characterize the distance between the electrode and the workpiece being processed after the electrode moves a preset distance toward the workpiece during each electrospark machining process; According to the discharge state, calculating the discharge probability of a set of discharge pulse sequences corresponding to each gap measurement point; According to the discharge probability, a target gap of the electrical discharge machining is determined.

2. The method for measuring the discharge gap of electric spark machining according to claim 1, characterized in that: The method further comprises: Obtaining the short-circuit probability of each discharge pulse of the plurality of discharge pulse sequences emitted by the pulse power source at the corresponding gap measurement point; When the short circuit probability reaches a preset threshold, a relationship curve between the discharge probability and the gap measurement point is obtained; the abscissa of the relationship curve is the gap, and the ordinate is the discharge probability.

3. The method for measuring the discharge gap of electric spark machining according to claim 2, characterized in that: The gap corresponding to the gap measurement point at the starting point of the relationship curve between the discharge probability and the gap measurement point is a preset gap, and the corresponding discharge probability is 0%; the gap corresponding to the gap measurement point at the end point of the relationship curve between the discharge probability and the gap measurement point is the gap when the short circuit probability is 100%, and the corresponding discharge probability is 0%; wherein, when the gap corresponding to the gap measurement point is larger than the gap corresponding to the gap measurement point at the starting point of the relationship curve between the discharge probability and the gap measurement point and smaller than the gap corresponding to the gap measurement point at the end point of the relationship curve between the discharge probability and the gap measurement point, the discharge probability corresponding to the gap measurement point is greater than 0.

4. The method for measuring the discharge gap of electric spark machining according to claim 1, characterized in that: According to the discharge probability, the target gap of the EDM discharge is determined, including: When the discharge probability is 100%, the corresponding gap measurement value of the electric discharge machining discharge is determined, and the corresponding gap measurement value of the electric discharge machining discharge is used as the target gap of the electric discharge machining discharge.

5. The method for measuring the discharge gap of electric spark machining according to claim 1, characterized in that: According to the discharge state, the discharge probability of a set of discharge pulse sequences corresponding to each gap measurement point is calculated, including: According to the discharge state, determining the number of discharge pulses for generating spark discharge in a set of discharge pulse sequences; The discharge probability is determined according to the number of discharge pulses generating spark discharge and the total number of discharge pulses in a set of discharge pulse sequences.

6. The method for measuring the discharge gap of electric spark machining according to claim 1, characterized in that: The difference between the gap measurement point corresponding to the current moment and the gap measurement point corresponding to the next moment is the preset distance.

7. A device for measuring the discharge gap of an electrospark machining process, characterized in that: The device comprises: An acquisition module is used to acquire the discharge state of each pulse of a plurality of discharge pulse sequences emitted by a pulse power source at a corresponding gap measurement point; each discharge pulse sequence corresponds to a gap measurement point; the gap measurement point is used to characterize the distance between the electrode and the workpiece being processed after the electrode moves a preset distance toward the workpiece during the electrospark machining process each time; A calculation module, used for calculating the discharge probability of a set of discharge pulse sequences corresponding to each gap measurement point according to the discharge state; The target determination module is used to determine the target gap of the electric spark machining discharge according to the discharge probability.

8. An electronic device comprising: one or more processors; a memory for storing one or more programs, When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, enables the processor to implement the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, which, when executed by a processor, implements the method according to any one of claims 1 to 6.

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