CN114505552A - Double-power-supply lead-in discharge machining method for reciprocating wire-moving electrospark wire-electrode cutting - Google Patents
Double-power-supply lead-in discharge machining method for reciprocating wire-moving electrospark wire-electrode cutting Download PDFInfo
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- CN114505552A CN114505552A CN202210240272.3A CN202210240272A CN114505552A CN 114505552 A CN114505552 A CN 114505552A CN 202210240272 A CN202210240272 A CN 202210240272A CN 114505552 A CN114505552 A CN 114505552A
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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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Abstract
A double-power-supply lead-in discharge machining method for reciprocating wire-moving electrospark wire-electrode cutting is characterized in that power supply energy is alternately distributed through two pulse power supplies, and pulse discharge energy of an upper conductive block and a lower conductive block is respectively controlled according to different wire moving directions of a wire electrode, so that asymmetry of discharge energy caused by different wire moving directions during cutting of a high-thickness workpiece is balanced, the problem of unilateral wire loosening of the wire electrode is solved, cutting stability is improved, waist drum errors of main cutting and trimming of the high-thickness workpiece are effectively reduced, and machining precision and surface quality are improved.
Description
Technical Field
The invention belongs to the technical field of electrospark wire-electrode cutting machining, in particular to a double-power-supply lead-in discharge electrospark wire-electrode machining technology, and particularly relates to a double-power-supply lead-in discharge machining method for reciprocating wire-feeding electrospark wire-electrode cutting.
Background
The high-speed reciprocating wire-moving electric spark wire cutting machining is an original electric spark wire cutting machining mode in China, is mainly characterized by simple structure, high cost performance, large cutting thickness, low operation cost and the like, and is widely applied to the die manufacturing industry and the machine manufacturing industry, in particular to the machining of high-thickness parts.
It is acknowledged that the processing quality of the high-speed wire-moving linear cutting machine can be effectively improved by multiple times of cutting, but a workpiece subjected to multiple times of cutting has certain waist drum degree, and the waist drum degree is also sharply increased along with the increase of the thickness of the workpiece, so that the processing precision of the high-thickness workpiece is seriously influenced. The machining state of the machining gap of the high-thickness workpiece is more complicated than that of the machining gap of the low-thickness workpiece. At present, a reciprocating wire cutting machine tool generally adopts a mode of symmetrically arranging upper and lower conductive blocks and simultaneously feeding electricity, discharge energy of the upper end and the lower end of a workpiece can change along with a wire moving direction, and machining energy at two ends of the workpiece in a machining area in a single wire moving direction is different. As shown in fig. 2, the amount of erosion increases, the machining state between the machining electrodes deteriorates, erosion products are likely to accumulate at the outlet of the wire electrode, the workpiece size at the outlet becomes smaller, and the error in the waist drum degree increases.
In addition, due to the fact that acting forces of all regions, which are applied to the electrode wire in the front and back wire traveling directions, are asymmetric, the elongation of the electrode wire in different wire traveling directions is different. As shown in fig. 3, when the wire is moved in the forward direction, the working fluid can enter the cutting seam more easily, so that the total discharge probability in the cutting seam is higher, and the damping effect generated by the explosive force is larger; when the wire is fed reversely, the working liquid is not easy to enter the cutting seam due to the action of gravity, so that the discharge probability is not uniformly distributed in the cutting seam, and the total discharge probability is lower than that of the wire fed forwardly, so that the damping effect formed by the discharge explosive force is smaller. Eventually accumulating to cause a severe single-sided floss condition.
Disclosure of Invention
The invention aims to solve the problem that waist drum degree errors are increased easily due to uneven energy distribution of the upper end and the lower end of a workpiece in reciprocating wire-moving electric spark wire cutting machining, and provides a method for improving reciprocating wire-moving electric spark wire cutting machining precision by realizing alternating distribution of power supply energy through double power supply lead-in discharge. Meanwhile, in the machining process of a single wire feeding direction, the pulse discharge energy introduced from the upper part to the lower part can be respectively controlled, 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 main cutting and trimming of the high-thickness workpiece are effectively reduced, and the machining precision and the indication quality are improved.
The technical scheme of the invention is as follows:
a reciprocating wire-moving electric spark wire cutting dual-power lead-in discharge machining method is characterized in that: 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 a wire electrode through an upper feeding block and a lower feeding block respectively; and secondly, the energy output of the two pulse power supplies is respectively controlled in the reciprocating motion process of the wire electrode, and the pulse discharge energy introduced from the upper part to the lower part is respectively controlled according to the different wire electrode running directions, so that the asymmetry of the discharge energy caused by the different wire electrode running directions during the cutting of the large-thickness workpiece is balanced, the problem of single-side wire loosening of the wire electrode is solved, the cutting stability is improved, the waist drum degree errors of the main cutting and the trimming of the large-thickness workpiece are effectively reduced, and the processing precision and the surface quality are improved.
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 and lower conductive blocks are mutually independent.
The pulse power supply 1 and the pulse power supply 2 can control output pulse discharge energy according to the wire moving direction signal, and the output energy control range is from 0-100%.
When the output energy of the pulse power supply 1 is greater than that of the pulse power supply 2, the discharge energy at the upper end of the workpiece is greater than that at the lower end; when the output energy of the pulse power supply 1 is smaller than that of the pulse power supply 2, the discharge energy at the upper end of the workpiece is smaller than that at the lower end.
When the wire electrode moves in the positive direction from top to bottom, the energy output by the two pulse power supplies is adjusted to realize that the discharge energy at the upper end of the positive wire electrode moves is large or the discharge energy at the lower end of the positive wire electrode moves is large; when the wire electrode is reversely wound from bottom to top, the energy output by the two pulse power supplies is adjusted to realize that the discharge energy at the upper end or the discharge energy at the lower end of the reversely wound wire electrode is large.
The output energy of the pulse power supply is adjusted by changing one or a combination of the internal resistance or the output voltage of the power supply.
According to the change of the thickness of the workpiece, the proportion of the output energy of the pulse power supply 1 and the pulse power supply 2 is adjusted, so that the cutting of the workpiece with different thicknesses or variable thicknesses is realized.
Only one pulse power supply of the traditional reciprocating wire-moving electric spark wire cutting machine tool is used, when a high-thickness workpiece is cut, due to the fact that a cutting seam is long and the corrosion removal amount is increased, corrosion removal products are accumulated at the outlet end of a wire electrode, working fluid at the outlet end is mixed with the corrosion removal products, the medium resistance is reduced, and the discharge energy is increased, as shown in fig. 4 (a). And the inlet end of the electrode wire is rich in working fluid, so that the resistance value of the original working fluid is maintained. Therefore, in order to balance the processing energy of each part of the workpiece, signals of the wire electrode wire traveling direction need to be collected, and the signals are used as feedback, so that the two pulse power supplies adjust the output energy according to the wire traveling direction. When the filament is positively fed, the output energy of the two pulse power supplies can be adjusted to ensure that the output energy of the lower conductive block is less than that of the upper conductive block; when the wire is reversely wound, the output energy of the upper conductive block is ensured to be smaller than that of the lower conductive block. Therefore, the processing sizes of the two ends can be ensured to be closer, meanwhile, as the two conductive block loops are separated, the processing resistance is increased, and the discharge energy of the middle section of the workpiece is reduced compared with 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 form a special shape with a small size at the upper end and a large size at the lower end by adjusting the output energy of the upper and lower conductive blocks 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 moving direction, the unilateral wire loosening problem of reciprocating wire moving processing is effectively relieved. Because the working fluid is influenced by the gravity action during the reverse wire traveling and is not easy to enter the cutting seam, the discharging probability is lower than that during the forward wire traveling during the reverse wire traveling, so that the output energy of the pulse power supply during the reverse wire traveling can be increased to balance the corrosion removal amount of the reverse wire traveling, as shown in figure 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 reverse wire traveling of the reciprocating wire traveling machine tool in high-thickness machining, the invention realizes the effective control of the discharge energy at 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 high-thickness workpiece machining by the conventional power supply method, and reduces the waist drum degree error;
2) when the cutting tool is used for cutting in ultrahigh thickness, the harmonic waves formed by the low-frequency vibration of the electrode wire can cause the periodic fluctuation of the processing surface, the resonance effect caused by the same discharge energy at the two ends of the original electrode wire is destroyed by changing the discharge energy output by the two conductive block loops, the low-frequency vibration of the electrode wire is inhibited, and the flatness of the processing surface is improved.
3) The condition of unilateral loosening can be effectively improved by controlling the discharge energy proportion of the upper and lower conducting blocks in different wire moving directions.
Drawings
FIG. 1 is a schematic view of the method for alternately distributing the power supply to the reciprocating wire-cut electric discharge machine according to the present invention.
Fig. 2 is a schematic view of a state of machining in a reciprocating wire electric discharge machining slit.
FIG. 3 is a force model of the electrode wire in the forward and backward wire moving directions.
FIG. 4 is a schematic diagram of the present invention for reducing the waist drum error of main cut and trim. FIG. 4 (a) results of conventional processing; FIG. 4 (b) shows the result of the machining mode in which the power is alternately distributed.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in fig. 1.
A reciprocating wire-moving electric spark wire cutting dual-power lead-in discharge machining method comprises the following hardware components: the device comprises two pulse power supplies, an upper conductive block, a lower conductive block, an electrode wire and a workpiece, wherein the positive electrodes of the two pulse power supplies are simultaneously connected with the workpiece, 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. According to the invention, the effective control of the discharge energy at two ends of the workpiece is realized by controlling the output energy of the two pulse power supplies, the defect of uneven energy distribution in the processing of the large-thickness workpiece by the conventional power supply method is overcome, the vibration of the wire electrode is inhibited, and the waist drum degree error is reduced.
The alternating power supply energy distribution of the reciprocating wire-moving electric spark linear cutting machine can form four energy distribution modes according to the wire moving direction and the output energy of the upper and lower conductive blocks, and the specific distribution modes are as follows:
the energy of the conductive block on the forward running wire is large
The distribution mode refers to the condition that when the electrode wire runs in the positive direction, 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 running is large
The distribution mode refers to that when the electrode wire runs in the positive direction, 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 running 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 conducting block under the reverse running is large
The distribution mode refers to that when the electrode wire runs in the reverse direction, 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 during unidirectional wire traveling, and can be combined randomly according to forward and reverse wire traveling during reciprocating wire traveling electric spark wire cutting processing.
As shown in fig. 2, by adopting the alternating distribution method of the power supply energy of the reciprocating wire-cut electric discharge machine, compared with the original energy distribution method, the equivalent resistance of the wire electrode is larger in any distribution method, so that the total current is reduced, the discharge explosive force is weakened, and the deflection deformation of the wire electrode is smaller during the tool repairing. Meanwhile, because the two conductive blocks have different output energy, the resonance effect on the electrode wire is greatly reduced when the electrode wire is cut in ultrahigh thickness, the low-frequency vibration of the electrode wire is reduced, and the flatness of a machined surface is improved. In addition, the influence of unilateral loosening can be reduced to a certain extent by adjusting the output energy of the upper and lower conductive blocks. When the high-thickness workpiece is repaired, due to the fact that chip removal difficulty is increased, corrosion products can be accumulated at the wire electrode outlet, working fluid resistance at the wire electrode outlet is reduced, discharge energy is increased, and therefore corrosion removal amount of two ends of the workpiece is increased. In a preferred embodiment, the distribution mode is preferably that the conductive blocks on the forward running wire have high energy and the conductive blocks on the reverse running wire have high energy. At the moment, although the resistance value of the working fluid at the outlet is lower, the output energy of the pulse power supply at the outlet is reduced due to the resistance of the wire electrode, and the original processing energy can be maintained at the inlet. The erosion removal amount of each part of the processing surface is close, and the waist drum degree error is further reduced.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For the technical field of the present invention, several simple deductions or substitutions can be made without departing from the control method proposed by the present invention according to the research, and all should be considered as belonging to the protection scope of the present invention.
The invention is not related in part to or can be practiced using the prior art.
Claims (7)
1. A reciprocating wire-moving electric spark wire cutting dual-power lead-in discharge machining method is characterized in that: 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 an electrode wire through an upper feeding block and a lower feeding block respectively; and secondly, the energy output of the two pulse power supplies is respectively controlled in the reciprocating motion process of the wire electrode, and the pulse discharge energy introduced from the upper part to the lower part is respectively controlled according to the different wire electrode running directions, so that the asymmetry of the discharge energy caused by the different wire electrode running directions during the cutting of the large-thickness workpiece is balanced, the problem of single-side wire loosening of the wire electrode is solved, the cutting stability is improved, the waist drum degree errors of the main cutting and the trimming of the large-thickness workpiece are effectively reduced, and the processing precision and the surface quality are improved.
2. The method of claim 1, wherein: 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 and lower conductive blocks are mutually independent.
3. The method of claim 2, wherein: the pulse power supply 1 and the pulse power supply 2 can control output pulse discharge energy according to the wire moving direction signal, and the output energy control range is from 0-100%.
4. The method of claim 3, wherein: when the output energy of the pulse power supply 1 is greater than that of the pulse power supply 2, the discharge energy at the upper end of the workpiece is greater than that at the lower end; when the output energy of the pulse power supply 1 is smaller than that of the pulse power supply 2, the discharge energy at the upper end of the workpiece is smaller than that at the lower end.
5. The method of claim 4, wherein: when the wire electrode moves in the positive direction from top to bottom, the energy output by the two pulse power supplies is adjusted to realize that the discharge energy at the upper end of the positive wire electrode moves is large or the discharge energy at the lower end of the positive wire electrode moves is large; when the wire electrode is reversely wound from bottom to top, the energy output by the two pulse power supplies is adjusted to realize that the discharge energy at the upper end or the discharge energy at the lower end of the reversely wound wire electrode is large.
6. The method of claim 3, wherein: the output energy of the pulse power supply is adjusted by changing one or a combination of the internal resistance or the output voltage of the power supply.
7. The method of claim 2, wherein: according to the change of the thickness of the workpiece, the proportion of the output energy of the pulse power supply 1 and the pulse power supply 2 is adjusted, and the cutting of the workpiece with different thicknesses or variable thicknesses is realized.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114770780A (en) * | 2022-05-31 | 2022-07-22 | 青岛高测科技股份有限公司 | Rod processing device |
| CN114833955A (en) * | 2022-05-31 | 2022-08-02 | 青岛高测科技股份有限公司 | Wire cutting machine |
| 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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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114770780A (en) * | 2022-05-31 | 2022-07-22 | 青岛高测科技股份有限公司 | Rod processing device |
| CN114833955A (en) * | 2022-05-31 | 2022-08-02 | 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 |
| CN114833955B (en) * | 2022-05-31 | 2024-02-02 | 青岛高测科技股份有限公司 | Wire cutting machine |
| 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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