CN117506039A - Wire cut electric discharge machining method, device, computer equipment and storage medium - Google Patents

Wire cut electric discharge machining method, device, computer equipment and storage medium Download PDF

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Publication number
CN117506039A
CN117506039A CN202311780666.9A CN202311780666A CN117506039A CN 117506039 A CN117506039 A CN 117506039A CN 202311780666 A CN202311780666 A CN 202311780666A CN 117506039 A CN117506039 A CN 117506039A
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China
Prior art keywords
discharge
wire
machining
electrode
workpiece
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CN202311780666.9A
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Chinese (zh)
Inventor
杨哲
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Makino China Co Ltd
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Makino China Co Ltd
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Priority to CN202311780666.9A priority Critical patent/CN117506039A/en
Publication of CN117506039A publication Critical patent/CN117506039A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23HWORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H7/00Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/02Wire-cutting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23HWORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H11/00Auxiliary apparatus or details, not otherwise provided for

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

The invention belongs to the technical field of wire cutting, and discloses a wire cut electrical discharge machining method, a wire cut electrical discharge machining device, computer equipment and a storage medium. The method comprises the following steps: applying electricity to the electrode wire and the workpiece by using standard discharge parameters so as to perform wire-cut electric discharge machining on the workpiece; identifying a discharge gap between the electrode wire and the workpiece at the current machining position in the wire-cut electric discharge machining process, and simultaneously identifying a discharge state parameter of the electrode wire; when the current discharge state parameter of the electrode wire is identified as being lower than the standard discharge state parameter when the electrode wire discharges with the standard discharge parameter, the discharge energy of the electrode wire is reduced, the discharge time of the electrode wire is shortened, and/or the discharge frequency of the electrode wire is increased until the discharge gap of the current machining part is identified as finishing the machining size of the current machining part. The invention can adapt to different workpiece conditions and improve the stability of the size of the workpiece processed by wire-cut electric discharge machining.

Description

Wire cut electric discharge machining method, device, computer equipment and storage medium
Technical Field
The invention relates to the technical field of wire cutting, in particular to a wire cut electrical discharge machining method and device.
Background
Wire electric discharge machining is a special machining method, as shown in fig. 1, and the machining principle is to etch away redundant metal on a workpiece based on the electric corrosion phenomenon during pulse spark discharge between the workpiece 1 and the electrode wire 2 so as to meet the preset machining requirements on the size, shape and surface quality of the workpiece 1. Machining chips generated during machining are generally discharged from a machining portion by spraying a machining liquid through a nozzle (not shown), and the machining liquid also serves to cool the workpiece 1 and the wire electrode 2 while discharging.
In wire electric discharge machining, the nozzle should ideally be held close to the workpiece 1 to be machined along with the wire electrode 2, but in many cases, the nozzle and the workpiece 1 are necessarily separated due to factors such as the shape of the workpiece 1, for example, when a plastic mold is machined, the cavity surface of the mold tends to have an irregular shape due to profiling with a molded plastic part which is mostly in a special shape, and when the nozzle (not shown) is far away from the workpiece 1 to be machined, the nozzle jet is insufficient, so that machining scraps remain on the workpiece 1 to affect the machining process, and meanwhile, the wire electrode 2 is vibrated due to jet fluctuation, so that the wire electrode 2 is offset, and when the distance between the wire electrode 2 and the workpiece 1 exceeds a machining gap, the amount of electric erosion is insufficient, so that machining residues 11 are generated on the surface of the workpiece. Thus, even with the same processing conditions (e.g., discharge parameters), the size of the workpiece that is ultimately processed varies with the nozzle distance.
Therefore, a solution is needed to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a wire cut electric discharge machining method, a device, computer equipment and a storage medium, which are used for adapting to different workpiece conditions and improving the dimensional stability of the workpiece subjected to wire cut electric discharge machining.
To achieve the purpose, the invention adopts the following technical scheme:
a wire electric discharge machining method comprising:
applying electricity to the electrode wire and the workpiece by using standard discharge parameters so as to perform wire-cut electric discharge machining on the workpiece;
identifying a discharge gap between the electrode wire and the workpiece at the current machining position in the wire-cut electric discharge machining process, and simultaneously identifying discharge state parameters of the electrode wire, wherein the discharge state parameters comprise total pulse times and/or discharge spark numbers of the electrode wire;
when the current discharge state parameter of the electrode wire is identified as being lower than the standard discharge state parameter when the electrode wire discharges with the standard discharge parameter, the discharge energy of the electrode wire is reduced and/or the discharge time of the electrode wire is shortened and/or the discharge frequency of the electrode wire is increased until the discharge gap of the current machining part is identified as finishing the machining size of the current machining part.
Preferably, the method further comprises: and when the electrode wire finishes the processing of the current processing part and moves to the next processing part, re-applying electricity to the electrode wire and the workpiece according to the standard discharge parameters.
Preferably, said applying power to the wire electrode and the workpiece at standard discharge parameters comprises:
and within the length of the electrode wire, acquiring the maximum processing length of all the processed parts of the workpiece, and setting the standard discharge parameters according to the maximum processing length.
Preferably, the method further comprises: when the discharge gap of the current machining part is identified to be approaching to the machining size of the current machining part, the discharge energy of the electrode wire is reduced, the discharge time of the electrode wire is shortened, and/or the discharge frequency of the electrode wire is increased.
To achieve the purpose, the invention also adopts the following technical scheme:
a wire electric discharge machining apparatus, the system comprising:
the power supply unit is used for supplying power to the electrode wire and the workpiece according to standard discharge parameters so as to perform wire-cut electric discharge machining on the workpiece;
the identification unit is used for identifying a discharge gap between the electrode wire and the workpiece at the current machining position in the wire-electrode cutting machining process and simultaneously identifying discharge state parameters of the electrode wire, wherein the discharge state parameters comprise total pulse times and/or discharge spark numbers of the electrode wire;
and the control unit is used for controlling the power applying unit to reduce the discharge energy of the wire electrode and/or shorten the discharge time of the wire electrode and/or increase the discharge frequency of the wire electrode when the identification unit identifies that the current discharge state parameter of the wire electrode is lower than the standard discharge state parameter when the wire electrode discharges with the standard discharge parameter until the discharge gap of the current machining part is identified as finishing the machining size of the current machining part.
To achieve the purpose, the invention also adopts the following technical scheme:
a computer device comprising a memory and a processor, the memory having a computer program stored therein, the processor performing the wire electric discharge machining method described above when the processor runs the computer program stored in the memory.
To achieve the purpose, the invention also adopts the following technical scheme:
a computer-readable storage medium storing a computer program that performs the wire electric discharge machining method described above.
The invention has the beneficial effects that:
the wire cut electrical discharge machining method, the wire cut electrical discharge machining device, the computer equipment and the storage medium can adaptively adjust the discharge energy, the discharge time and the discharge frequency according to the total pulse number, the discharge spark number and the discharge gap change of the wire electrode discharge, ensure the material removal consistency of workpieces and improve the machining precision.
Drawings
FIG. 1 is a schematic drawing of a machining process with wire electrode and workpiece in normal discharge gap;
FIG. 2 is a schematic drawing of the machining of the wire electrode and workpiece beyond the normal discharge gap;
FIG. 3 is a flow chart of a wire electric discharge machining method according to the present invention;
fig. 4 is a schematic drawing showing the machining when a workpiece is machined by the wire electric discharge machining method according to the present invention.
In the figure:
1. a workpiece; 11. processing residues; 2. electrode wire.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
As described above, in wire electric discharge machining, the machining stability is lowered under the influence of machining conditions such as the jet flow condition of the nozzle, and thus, the present embodiment provides a wire electric discharge machining method with which a wire electric discharge machining apparatus can be suitably used for wire electric discharge machining of metal workpieces, particularly, shaped workpieces having high requirements for dimensional accuracy and surface quality, which contributes to securing the machining requirements and improving the machining stability.
Please refer to fig. 3 and 4 for a specific description of the above-described method and apparatus. Fig. 3 is a flowchart of the method, fig. 4 illustrates an exemplary machining process of the machined special-shaped workpiece 1, and along the machining direction and the machining progress, the wire electrode 2 performs wire cutting machining on three different machining positions of the workpiece 1 when the points P1, P2 and P3 marked in fig. 4 are actually at three different machining time nodes.
Generally, in the machining process of a wire electric discharge machining apparatus, a workpiece 1 and a wire electrode 2 (i.e., tool electrodes) are respectively connected to two electrodes of different polarities of an energizing unit (pulse power source), and as in the prior art, when a proper gap is maintained between the workpiece 1 and the wire electrode 2, a working fluid medium between the workpiece 1 and the wire electrode 2 breaks down to form a discharge path. The discharge channel generates instant high temperature to melt and even gasify the surface material of the workpiece 1, and simultaneously gasifies the working fluid medium, so that the workpiece 1 rapidly thermally expands at the discharge gap and explodes, and a small part of the surface material of the workpiece 1 is etched and thrown out to form a tiny electric etching pit.
In the whole process of the electric discharge machining of the workpiece 1, the existing machining method generally adopts a standard electric discharge parameter to finish machining all machining parts of the workpiece 1, namely, generally finishes machining all machining parts of the workpiece 1 with a constant electric discharge energy, electric discharge time and electric discharge frequency. Referring to the three machining portions P1, P2 and P3 in fig. 4, since the lengths of the portions aligned with the electrode wire 2 are different, that is, the areas of the three portions to be machined are different, when machining is performed on the three portions by using the standard discharge parameters, the problem of stability of machining due to the foregoing machining conditions occurs, so that the machining personnel must actively and repeatedly correct the discharge parameters to improve, and the result is constrained by the personal experience of the machining personnel.
In view of this, this embodiment proposes a further improvement based on the above-mentioned processing method, so that the processing process is not affected by the processing conditions such as the nozzle distance, and after the above-mentioned processing method is adopted, the processing personnel are not required to adjust the processing conditions, and the processing personnel with different experience conditions can obtain stable dimensional accuracy of the workpiece 1.
Specifically, referring to fig. 3, the processing method includes the following steps:
s1, applying electricity to the electrode wire 2 and the workpiece 1 according to standard discharge parameters so as to perform wire-cut electric discharge machining on the workpiece 1;
s2, identifying a discharge gap between the wire electrode 2 and the workpiece 1 at the current machining position in the wire electric discharge machining process, and simultaneously identifying discharge state parameters of the wire electrode 2, wherein the discharge state parameters comprise total pulse times and/or discharge spark numbers of the wire electrode 2;
and S3, when the current discharge state parameter of the wire electrode 2 is identified as being lower than the standard discharge state parameter when the wire electrode 2 discharges with the standard discharge parameter, reducing the discharge energy of the wire electrode 2 and/or reducing the discharge time of the wire electrode 2 and/or increasing the discharge frequency of the wire electrode 2 until the discharge gap of the current machining part is identified as finishing the machining size of the current machining part.
Referring specifically to the different machining sites in fig. 4, for example, at the P1 machining site, the area of the machined site is larger than that of the P2 machining site, and under this difference, the electrical discharge parameters of the wire electrode 2 at the P2 machining site will be different from those at the P1 machining site, specifically, the number of total pulses (generally including electrical discharge pulses, detection pulses, short-circuit pulses, etc.), the number of electrical discharge pulses and the number of electrical discharge sparks of the wire electrode 2 will be reduced due to the reduced alignment length of the wire electrode 2 with the workpiece 1. Therefore, in the machining, by identifying the discharge state parameters of the unit electrode wire 2, when the parameters change, the corresponding lengths of the current machining part of the workpiece 1 and the electrode wire 2 can be correspondingly known through the parameter change range, and then, the discharge energy of the electrode wire 2 is correspondingly reduced, the discharge time of the electrode wire 2 is correspondingly shortened, and/or the discharge frequency of the electrode wire 2 is correspondingly increased, so that the consistency after the materials are removed at different machining parts can be ensured.
The above-mentioned recognition unit may generally include a pulse power source, a working fluid detection system, etc., and, with reference to the prior art, the pulse power source is responsible for generating a pulse voltage that breaks down the working fluid to generate spark discharge when an appropriate gap is maintained between the workpiece 1 and the electrode. The number of discharge pulses and the number of discharge sparks in this process can be monitored by the current and voltage waveforms of the power supply. The working fluid is used as a discharge medium and also plays roles of cooling, chip removal and the like in the processing process. The state and flow of the working fluid affect the size of the discharge gap, and thus information of the discharge gap can be indirectly obtained by monitoring the state and flow of the working fluid. The automatic control system is responsible for controlling the feeding of the tool electrode to the workpiece 1, and ensuring the normal operation of pulse discharge. The system can automatically adjust the relative positions of the tool electrode and the workpiece 1 according to the information of the discharge pulse times, the discharge gap and the discharge spark number in a feedback control mode so as to optimize the processing effect. In addition, there are specialized devices and circuits available in the art for detecting the voltage of the discharge gap. For example, a filter circuit composed of a resistor and a capacitor may be used to obtain the average value of the gap voltage, and a potentiometer may be used to extract and output the voltage signal.
In addition, regarding the recognition of the discharge gap, in the electric discharge machining, a gap voltage and current average detection method (detection of the discharge gap state using a discharge gap voltage or current average detection method), a discharge pulse effective spark count detection method (determination of the discharge gap state after counting and analyzing the number of effective discharge pulses, ineffective discharge pulses, and harmful discharge pulses generated by a certain number of discharge pulses applied between the tool electrode and the workpiece 1, respectively), a gap average pulse width voltage detection method (removal of the influence of the zero voltage in the inter-pulse stage on the average voltage, and only the average of the voltage in the gap pulse width stage), a gap pulse width voltage digital average method (sampling and a/D conversion of the voltage in the gap pulse width stage using a high-speed a/D conversion chip, sampling and a/D conversion are not performed in the inter-pulse stage using pulse control synchronized with a pulse power supply, and the obtained voltage is compared with the servo voltage by digital averaging the values obtained by a plurality of times, thereby guiding the servo motion), and the like may be used. Therefore, the above identification units and specific identification circuits and methods can be all adopted in the prior art, and are not described and limited herein.
In summary, the processing method aims at adaptively adjusting the magnitude, the discharge time and the discharge frequency of the discharge energy according to the total pulse times, the discharge spark numbers and the discharge gap changes, ensuring the material removal consistency of workpieces and improving the processing precision.
When the wire electrode 2 is finished at the current machining position in any intermediate stage and is moved to the next machining position, the wire electrode 2 and the workpiece 1 are preferably reapplied with standard discharge parameters, and the above-mentioned identification and adjustment steps are performed.
Alternatively, since the maximum area that the wire electrode 2 can process is associated with the length of the wire electrode 2 in each processing action, step S1 may include: the above-mentioned identification and adjustment steps can be more conveniently performed by acquiring the maximum machining length of all the machined parts of the workpiece 1 within the length of the wire electrode 2 according to the size condition of the machined workpiece 1 and setting the standard discharge parameters with the maximum machining length.
The machining thickness (erosion amount) of each machining portion is generally determined by identifying the discharge gap between the wire electrode 2 and the workpiece 1 at the current machining portion in the wire electric discharge machining process, and excessive erosion is caused when the discharge gap is identified to reach a specified parameter due to the persistence of machining and the unavoidable delay of signal identification. Therefore, the method further comprises the steps of reducing the discharge energy of the wire electrode 2 and/or shortening the discharge time of the wire electrode 2 and/or increasing the discharge frequency of the wire electrode 2 when the discharge gap of the current machining part is identified to be close to the machining size of the current machining part, so that the machining speed of the last stage of each machining action is slowed down, the consistency of workpiece material removal is further ensured, and the machining precision is improved.
In order to be able to perform the above-described method, the present embodiment also provides a wire electric discharge machining apparatus including an electric discharge unit, an identification unit, and a control unit. The power application unit is used for applying power to the electrode wire 2 and the workpiece 1 according to standard discharge parameters so as to perform wire-cut electric discharge machining on the workpiece 1. The identification unit is used for identifying the discharge gap between the wire electrode 2 and the workpiece 1 at the current machining position in the wire electric discharge machining process and simultaneously identifying the discharge state parameters of the wire electrode 2, wherein the discharge state parameters comprise the total pulse number and/or the discharge spark number of the wire electrode 2. The control unit is used for controlling the power applying unit to reduce the discharge energy of the wire electrode 2 and/or shorten the discharge time of the wire electrode 2 and/or increase the discharge frequency of the wire electrode 2 when the identification unit identifies that the current discharge state parameter of the wire electrode 2 is identified as being lower than the standard discharge state parameter when the wire electrode 2 discharges with the standard discharge parameter until the discharge gap of the current machining part is identified as finishing the machining size of the current machining part.
The technical means and technical effects adopted by the wire electric discharge machine are the same as those of the machining method, and are not described in detail herein.
The present embodiment also provides a computer device including a memory and a processor, in which a computer program is stored, and when the processor runs the computer program stored in the memory, the processor executes the processing method described above.
In addition, the embodiment also provides a computer readable storage medium, which is used for storing a computer program for executing the processing method.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (7)

1. A wire electric discharge machining method, characterized by comprising:
applying electricity to the electrode wire and the workpiece by using standard discharge parameters so as to perform wire-cut electric discharge machining on the workpiece;
identifying a discharge gap between the electrode wire and the workpiece at the current machining position in the wire-cut electric discharge machining process, and simultaneously identifying discharge state parameters of the electrode wire, wherein the discharge state parameters comprise total pulse times and/or discharge spark numbers of the electrode wire;
when the current discharge state parameter of the electrode wire is identified as being lower than the standard discharge state parameter when the electrode wire discharges with the standard discharge parameter, the discharge energy of the electrode wire is reduced and/or the discharge time of the electrode wire is shortened and/or the discharge frequency of the electrode wire is increased until the discharge gap of the current machining part is identified as finishing the machining size of the current machining part.
2. The wire electric discharge machining method according to claim 1, characterized by further comprising: and when the electrode wire finishes the processing of the current processing part and moves to the next processing part, re-applying electricity to the electrode wire and the workpiece according to the standard discharge parameters.
3. The wire electric discharge machining method according to claim 1, wherein the applying electricity to the wire electrode and the workpiece with the standard discharge parameters includes:
and within the length of the electrode wire, acquiring the maximum processing length of all the processed parts of the workpiece, and setting the standard discharge parameters according to the maximum processing length.
4. The wire electric discharge machining method according to claim 1, characterized by further comprising: when the discharge gap of the current machining part is identified to be approaching to the machining size of the current machining part, the discharge energy of the electrode wire is reduced, the discharge time of the electrode wire is shortened, and/or the discharge frequency of the electrode wire is increased.
5. A wire electric discharge machining apparatus, characterized in that the system comprises:
the power supply unit is used for supplying power to the electrode wire and the workpiece according to standard discharge parameters so as to perform wire-cut electric discharge machining on the workpiece;
the identification unit is used for identifying a discharge gap between the electrode wire and the workpiece at the current machining position in the wire-electrode cutting machining process and simultaneously identifying discharge state parameters of the electrode wire, wherein the discharge state parameters comprise total pulse times and/or discharge spark numbers of the electrode wire;
and the control unit is used for controlling the power applying unit to reduce the discharge energy of the wire electrode and/or shorten the discharge time of the wire electrode and/or increase the discharge frequency of the wire electrode when the identification unit identifies that the current discharge state parameter of the wire electrode is lower than the standard discharge state parameter when the wire electrode discharges with the standard discharge parameter until the discharge gap of the current machining part is identified as finishing the machining size of the current machining part.
6. A computer device, characterized by:
comprising a memory and a processor, the memory having stored therein a computer program, which when executed by the processor performs the wire electric discharge machining method according to any one of claims 1-4.
7. A computer-readable storage medium, characterized by:
the computer-readable storage medium is for storing a computer program that executes the wire electric discharge machining method according to any one of claims 1 to 4.
CN202311780666.9A 2023-12-22 2023-12-22 Wire cut electric discharge machining method, device, computer equipment and storage medium Pending CN117506039A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311780666.9A CN117506039A (en) 2023-12-22 2023-12-22 Wire cut electric discharge machining method, device, computer equipment and storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311780666.9A CN117506039A (en) 2023-12-22 2023-12-22 Wire cut electric discharge machining method, device, computer equipment and storage medium

Publications (1)

Publication Number Publication Date
CN117506039A true CN117506039A (en) 2024-02-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311780666.9A Pending CN117506039A (en) 2023-12-22 2023-12-22 Wire cut electric discharge machining method, device, computer equipment and storage medium

Country Status (1)

Country Link
CN (1) CN117506039A (en)

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