CN114505552B - Double-power-supply lead-in electric discharge machining method for reciprocating wire-moving wire-cut electric discharge machine - Google Patents
Double-power-supply lead-in electric discharge machining method for reciprocating wire-moving wire-cut electric discharge machine Download PDFInfo
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- CN114505552B CN114505552B CN202210240272.3A CN202210240272A CN114505552B CN 114505552 B CN114505552 B CN 114505552B CN 202210240272 A CN202210240272 A CN 202210240272A CN 114505552 B CN114505552 B CN 114505552B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING 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
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING 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
- B23H11/00—Auxiliary apparatus or details, not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING 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
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
- B23H7/08—Wire electrodes
- B23H7/10—Supporting, winding or electrical connection of wire-electrode
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING 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
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/14—Electric circuits specially adapted therefor, e.g. power supply
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
A double-power-supply lead-in electric discharge machining method for reciprocating wire-feeding electric spark wire cutting is characterized in that two pulse power supplies are used for alternately distributing power feeding energy, and pulse discharge energy of an upper conductive block and a lower conductive block is respectively controlled according to different wire-feeding directions of electrode wires, so that the asymmetry of discharge energy caused by different wire-feeding directions when a high-thickness workpiece is cut is balanced, the problem of single-side wire loosening of the electrode wires is solved, the cutting stability is improved, waist drum errors of a main cutting and a trimming knife of the high-thickness workpiece are effectively reduced, and the machining precision and the surface quality are improved.
Description
Technical Field
The invention belongs to the technical field of wire-cut electrical discharge machining, in particular to a double-power-supply lead-in electrical discharge machining technology, and particularly relates to a reciprocating wire-feed wire-cut double-power-in electrical discharge machining method.
Background
The high-speed reciprocating wire-moving wire-cut electric discharge machining is an original wire-cut electric discharge machining mode in China, and is mainly characterized by simple structure, high cost performance, large cutting thickness, low running cost and the like, and is widely applied to die manufacturing industry and machine manufacturing industry, in particular to high-thickness part machining.
It is acknowledged that the processing quality of the high-speed wire cutting machine can be effectively improved by multiple cutting, but the workpiece after multiple cutting presents a certain waist drum degree, and the waist drum degree is also increased sharply along with the increase of the thickness of the workpiece, so that the processing precision of the high-thickness workpiece is seriously affected. The machining state between poles of a high-thickness workpiece is more complex than machining of a low-thickness workpiece. At present, the reciprocating wire cutting machine tool generally adopts a mode of symmetrically arranging upper and lower conductive blocks and simultaneously feeding electricity, and the discharge energy at the upper end and the lower end of a workpiece can be changed along with the wire feeding direction, so that the processing energy at the two ends of the workpiece in a single wire feeding direction processing area is different. As shown in fig. 2, the erosion amount increases, and thus the machining state between electrodes is deteriorated, and erosion product accumulation is likely to occur at the outlet of the wire electrode, which results in a phenomenon that the workpiece size at the outlet is small, and the waist drum error is increased.
In addition, because the acting forces of the electrode wires in the forward and reverse wire running directions are asymmetric in all areas, the elongation of the electrode wires in different wire running directions is different. As shown in fig. 3, during forward wire feeding, the working fluid is easier to enter the kerf, so that the overall discharge probability in the kerf is higher, and the damping effect generated by the explosive force is larger; when the wire is reversely fed, under the action of gravity, working fluid is not easy to enter the kerf, so that the discharge probability is not uniformly distributed in the kerf, and the overall discharge probability is lower than that of the forward wire, so that the damping effect formed by the discharge explosion force is smaller. Eventually gradually accumulating resulting in a severe unilateral loose thread condition.
Disclosure of Invention
The invention aims at solving the problem that waist drum errors are increased easily due to uneven energy distribution at the upper end and the lower end of a workpiece in reciprocating wire-electrode cutting machining, and discloses a method for improving the machining precision of the reciprocating wire-electrode cutting by alternately distributing power feeding energy through double-power-supply lead-in discharge. Meanwhile, in the machining process of a single wire moving direction, the pulse discharge energy which is led in from top to bottom can be controlled respectively, so that the discharge energy of each part of the machining surface is balanced when the high-thickness workpiece is cut, the sizes of each part of the machining surface are close, the waist drum degree errors of the main cutting and trimming knife of the high-thickness workpiece are effectively reduced, and the machining precision and the indicating quality are improved.
The technical scheme of the invention is as follows:
a double-power-supply lead-in electric discharge machining method for reciprocating wire-moving electric spark wire cutting is characterized by comprising the following steps of: firstly, two pulse power supplies (a pulse power supply 1 and a pulse power supply 2) are used, the anodes of the two pulse power supplies are connected with a workpiece, and the cathodes of the two pulse power supplies are electrically connected with electrode wires through an upper power feeding block and a lower power feeding block respectively; and secondly, respectively controlling the energy output of two pulse power supplies in the reciprocating motion process of the electrode wire, and respectively controlling the upper and lower imported pulse discharge energy according to different wire travelling directions of the electrode wire, thereby balancing the asymmetry of discharge energy caused by different wire travelling directions when cutting a large-thickness workpiece, overcoming the problem of single-side wire loosening of the electrode wire, improving the cutting stability, effectively reducing the waist drum degree error of the main cutting and the trimming blade of the large-thickness workpiece, and improving the processing precision and the surface quality.
The negative electrode of the pulse power supply 1 is connected with the upper conductive block, and the negative electrode of the pulse power supply 2 is connected with the lower conductive block, so that loops formed by the two power supplies and the upper conductive block and the lower conductive block are mutually independent.
The pulse power supply 1 and the pulse power supply 2 can control the output pulse discharge energy according to the wire-running direction signal, and the output energy control range is 0-100%.
When the output energy of the pulse power supply 1 is larger than that of the pulse power supply 2, the discharge energy of the upper end of the workpiece is larger than that of the lower end of the workpiece; when the output energy of the pulse power supply 1 is smaller than that of the pulse power supply 2, the discharge energy of the upper end of the workpiece is smaller than that of the lower end.
When the wire feeding direction of the electrode wire is forward wire feeding from top to bottom, the large discharge energy at the upper end or the large discharge energy at the lower end of the forward wire feeding is realized by adjusting the energy output by the two pulse power supplies; when the wire feeding direction of the electrode wire is reverse from bottom to top, the high discharge energy at the upper end or the high discharge energy at the lower end of the reverse wire feeding is realized by adjusting the energy output by the two pulse power supplies.
The method for regulating the output energy of the pulse power supply is to change one or a combination of the internal resistance of the power supply and the output voltage.
According to the thickness change of the workpiece, the output energy ratio of the pulse power supply 1 and the pulse power supply 2 is adjusted to realize the cutting of the workpieces with different thicknesses or variable thicknesses.
When a traditional reciprocating wire-electrode wire cutting machine tool is used for cutting a workpiece with high thickness, as the cutting seam is longer and the etching amount is increased, accumulation of etching products is generated at the outlet end of the electrode wire, so that working fluid at the outlet end is mixed to etch the products, the medium resistance is reduced, and the discharging energy is increased, as shown in fig. 4 (a). The electrode wire inlet end maintains the resistance value of the original working solution because the working solution is abundant. Therefore, in order to balance the processing energy of each part of the workpiece, the electrode wire travelling direction signal needs to be collected, and the signal is used as feedback, so that the two pulse power supplies can adjust and output energy according to the wire travelling direction. When the wire is forward fed, the output energy of the two pulse power supplies can be adjusted, and the output energy of the lower conductive block is ensured to be smaller than that of the upper conductive block; when the wire is reversely run, the output energy of the upper conductive block is ensured to be smaller than that of the lower conductive block. Therefore, the machining dimensions of the two ends are ensured to be more approximate, and meanwhile, the machining resistance is also increased due to the separation of the two conductive block loops, and the discharging energy of the middle section of the workpiece is reduced compared with that of the prior art, so that the waist drum degree of the workpiece is reduced, as shown in fig. 4 (b).
In addition, the invention is a processing mode for balancing the sizes of the two ends of the workpiece, and the workpiece can be formed into a special shape with small upper end size and large lower end size by adjusting the output energy of the upper conductive block and the lower conductive block, if the energy of the upper conductive block is always kept larger than that of the lower conductive block, so that the special requirement can be met.
Because the output energy of the pulse power supply can be correspondingly adjusted according to the wire feeding direction, the problem of single-side wire loosening in reciprocating wire feeding processing is effectively relieved. Because the working fluid is affected by gravity during the reverse wire feeding, the working fluid is not easy to enter the kerf, and the discharge probability during the reverse wire feeding processing is lower than that during the forward wire feeding, so that the output energy of the pulse power supply during the reverse wire feeding can be increased to balance the erosion amount of the reverse wire feeding, as shown in fig. 3.
The method for adjusting the output energy of the pulse power supply can be one or a combination method of changing the internal resistance or the output voltage of the power supply.
Compared with the prior art, the invention has the beneficial effects that:
1) Aiming at the asymmetry of the forward and backward wire feeding of the high-thickness machining of the reciprocating wire feeding machine tool, the invention realizes the effective control of the discharge energy at the two ends of the workpiece by controlling the output energy of the two pulse power supplies, overcomes the defect of uneven energy distribution in the machining of the high-thickness workpiece by the existing power feeding method, and reduces the waist drum degree error;
2) When the electrode wire is cut in ultra-high thickness, the periodic fluctuation of the processing surface can be caused by harmonic waves formed by low-frequency vibration of the electrode wire, the resonance effect of the two ends of the original electrode wire, which is caused by the same discharge energy, is destroyed by changing the discharge energy output by the two conductive block loops, the low-frequency vibration of the electrode wire is restrained, and the flatness of the processing surface is improved.
3) The situation of unilateral wire loosening can be effectively improved by controlling the discharge energy proportion of the upper conductive block and the lower conductive block in different wire walking directions.
Drawings
Fig. 1 is a schematic diagram of an alternate distribution method of power supply energy of a reciprocating wire-cut electric discharge machine of the present invention.
Fig. 2 is a schematic view of a machining state in a reciprocating wire cut electrical discharge machining kerf.
FIG. 3 is a model of the force applied to the electrode wire in the forward and reverse wire running directions.
Fig. 4 is a schematic diagram of the present invention for reducing the waist drum error of the main cutter and the trimming cutter. FIG. 4 (a) results of a conventional process; fig. 4 (b) shows the result of the alternate distribution of the power supply energy to the processing mode.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in fig. 1.
A reciprocating wire-moving wire-cut electric discharge machining method with double power sources comprises the following hardware components: the device comprises two pulse power supplies, an upper conductive block, a lower conductive block, electrode wires and a workpiece, wherein the anodes of the two pulse power supplies are simultaneously connected with the workpiece, the cathode of the pulse power supply 1 is connected with the upper conductive block, and the cathode of the pulse power supply 2 is connected with the lower conductive block. The invention realizes the effective control of the discharged energy at the two ends of the workpiece by controlling the output energy of the two pulse power supplies, overcomes the defect of uneven energy distribution in the processing of the workpiece with large thickness by the existing power supply method, inhibits the vibration of the electrode wire and reduces the waist drum degree error.
The alternating power-in energy distribution of the reciprocating wire-moving wire-cut electric discharge machine can form four energy distribution modes according to the wire moving direction and the output energy of the upper conductive block and the lower conductive block, and the specific distribution modes are as follows:
the energy of the conductive block on the forward wire is high
The distribution mode refers to that when the electrode wire runs forward, the energy output by the pulse power supply 1 is larger than the energy output by the pulse power supply 2, namely the energy output by the upper conductive block is larger than the energy output by the lower conductive block.
(II) the energy of the conductive block under the forward wire is large
The distribution mode refers to that when the electrode wire runs forward, the energy output by the pulse power supply 1 is smaller than the energy output by the pulse power supply 2, namely the energy output by the upper conductive block is smaller than the energy output by the lower conductive block.
(III) the energy of the conductive block on the reverse wire is large
The distribution mode refers to that when the electrode wire runs reversely, the energy output by the pulse power supply 1 is larger than the energy output by the pulse power supply 2, namely the energy output by the upper conductive block is larger than the energy output by the lower conductive block.
(IV) the energy of the conductive block under the reverse wire-feeding is large
The distribution mode refers to that when the electrode wire runs reversely, the energy output by the pulse power supply 1 is smaller than the energy output by the pulse power supply 2, namely the energy output by the upper conductive block is smaller than the energy output by the lower conductive block.
The four energy distribution modes are only energy distribution modes when one-way wire is moved, and can be combined at will according to forward and reverse wire moving when the wire cut electrical discharge machining is performed by reciprocating wire moving.
As shown in fig. 2, by adopting the alternating distribution method of the power supply energy of the reciprocating wire-moving wire-cut electric discharge machine tool, compared with the original energy distribution mode, the equivalent resistance of the wire electrode is larger, so that the total current is reduced, the discharge explosive force is reduced, and the deflection deformation of the wire electrode is smaller during the repair of the cutter. Meanwhile, as the output energy of the two conductive blocks is different, the resonance effect on the electrode wire is greatly reduced during ultra-high thickness cutting, the low-frequency vibration of the electrode wire is reduced, and the flatness of the processing surface is improved. In addition, the influence of unilateral loose silk can be reduced to a certain extent by adjusting the output energy of the upper conductive block and the lower conductive block. When the high-thickness workpiece is trimmed, the chip removal difficulty is increased, and the etched product can be accumulated at the outlet of the electrode wire, so that the resistance of working solution at the outlet of the electrode wire is reduced, the discharge energy is increased, and the etched quantity at two ends of the workpiece is increased. As a preferred embodiment, the dispensing mode is preferably such that the upper conductive bump energy of the forward wire is high and the lower conductive bump energy of the reverse wire is high. At this time, although the resistance value of the working fluid at the outlet is lower, the resistance of the electrode wire reduces the output energy of the pulse power supply at the outlet, and the original processing energy can be maintained at the inlet. The erosion amount of each part of the processing surface is close, and the waist drum error is reduced.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. For the technical field of the invention, a plurality of simple deductions or substitutions can be made on the premise of not deviating from the control method according to the research and the invention is considered to belong to the protection scope of the invention.
The invention is not related in part to the same as or can be practiced with the prior art.
Claims (5)
1. A double-power-supply lead-in electric discharge machining method for reciprocating wire-moving electric spark wire cutting is characterized by comprising the following steps of: firstly, two pulse power supplies are used, the anodes of the two pulse power supplies are connected with a workpiece, and the cathodes of the two pulse power supplies are electrically connected with electrode wires through an upper power feeding block and a lower power feeding block respectively; secondly, respectively controlling the energy output of two pulse power supplies in the reciprocating motion process of the electrode wire, and respectively controlling the upper and lower imported pulse discharge energy according to different wire travelling directions of the electrode wire, so as to balance the asymmetry of discharge energy caused by different wire travelling directions when cutting a large-thickness workpiece, overcome the problem of single-side wire loosening of the electrode wire, improve the cutting stability, effectively reduce the waist drum degree error of the main cutting and the trimming blade of the large-thickness workpiece, and improve the processing precision and the surface quality; the negative electrode of the pulse power supply 1 is connected with the upper conductive block, and the negative electrode of the pulse power supply 2 is connected with the lower conductive block, so that loops formed by the two power supplies and the upper conductive block and the lower conductive block are mutually independent; the pulse power supply 1 and the pulse power supply 2 can control the output pulse discharge energy according to the wire-running direction signal, and the output energy control range is 0-100%.
2. The method according to claim 1, characterized in that: when the output energy of the pulse power supply 1 is larger than that of the pulse power supply 2, the discharge energy of the upper end of the workpiece is larger than that of the lower end of the workpiece; when the output energy of the pulse power supply 1 is smaller than that of the pulse power supply 2, the discharge energy of the upper end of the workpiece is smaller than that of the lower end.
3. The method according to claim 2, characterized in that: when the wire feeding direction of the electrode wire is forward wire feeding from top to bottom, the large discharge energy at the upper end or the large discharge energy at the lower end of the forward wire feeding is realized by adjusting the energy output by the two pulse power supplies; when the wire feeding direction of the electrode wire is reverse from bottom to top, the high discharge energy at the upper end or the high discharge energy at the lower end of the reverse wire feeding is realized by adjusting the energy output by the two pulse power supplies.
4. The method according to claim 1, characterized in that: the method for regulating the output energy of the pulse power supply is to change one or a combination of the internal resistance of the power supply and the output voltage.
5. The method according to claim 1, characterized in that: according to the thickness change of the workpiece, the output energy ratio of the pulse power supply 1 and the pulse power supply 2 is adjusted to realize the cutting of the workpieces with different thicknesses or variable thicknesses.
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| CN114833955B (en) * | 2022-05-31 | 2024-02-02 | 青岛高测科技股份有限公司 | Wire cutting machine |
| CN114770780B (en) * | 2022-05-31 | 2024-02-02 | 青岛高测科技股份有限公司 | Rod body processing device |
| CN114953229A (en) * | 2022-06-30 | 2022-08-30 | 青岛高测科技股份有限公司 | Composite processing method of wire cutting machine |
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| JPS60201826A (en) * | 1984-03-26 | 1985-10-12 | Fanuc Ltd | Power source for wire electric discharge machining |
| JPS61236427A (en) * | 1984-11-29 | 1986-10-21 | Sodeitsuku:Kk | Wire cut electric discharge machine |
| JPS61236433A (en) * | 1985-04-10 | 1986-10-21 | Inoue Japax Res Inc | Wire cut electric discharge machine |
| CN101257991B (en) * | 2006-10-19 | 2010-05-19 | 三菱电机株式会社 | Electric power circuit of line electrode electrical discharge machining device |
| CN100577335C (en) * | 2008-04-08 | 2010-01-06 | 哈尔滨工业大学 | Numerical control double-power mode multifunctional impulsing power source for electrospark wire-electrode cutting processing |
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