CN110814450A - Preparation method of multi-material laminated electrode - Google Patents
Preparation method of multi-material laminated electrode Download PDFInfo
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- CN110814450A CN110814450A CN201911201507.2A CN201911201507A CN110814450A CN 110814450 A CN110814450 A CN 110814450A CN 201911201507 A CN201911201507 A CN 201911201507A CN 110814450 A CN110814450 A CN 110814450A
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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
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/04—Electrodes specially adapted therefor or their manufacture
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Abstract
The embodiment of the invention provides a preparation method of a multi-material laminated electrode, which comprises the following steps: laminating and combining a first preset number of first metal foils and a second preset number of second metal foils to form a metal laminate; wherein the resistivity of the first metal foil is greater than the resistivity of the second metal foil; performing a first processing treatment on the metal lamination; carrying out second processing treatment on the metal laminated layer by adopting preset parameters to form an electrode blank; and carrying out electric spark machining treatment on the electrode blank to form a preset working surface profile to obtain the target electrode. The laminated electrode with the length of tens of millimeters can be simply and quickly prepared; compared with a micro-columnar electrode and a thin electrode, the laminated electrode has longer service life, can process a plurality of micro grooves at one time and has higher processing efficiency; the laminated electrode has relatively large cross section size, strong anti-interference capability and good processing stability, and is particularly suitable for the electric spark processing of large-batch blind micro grooves.
Description
Technical Field
The invention relates to the technical field of electrode processing, in particular to a preparation method of a multi-material laminated electrode.
Background
The micro electric spark machining is non-contact machining, has the advantages of no macroscopic cutting force, capability of machining any conductive material and the like, is an important technical means for preparing a surface blind micro-groove structure on a difficult-to-machine material, and is mainly obtained by micro-column electrode layer-by-layer scanning discharge machining and thin electrode up-and-down reciprocating discharge machining at present. However, the tool electrode inevitably suffers loss during the electric discharge machining, and particularly, the loss of the micro-electrode for microstructure machining is greater, thereby reducing the service life of the tool electrode, and it is difficult to continuously machine the surface blind micro-groove structure in large quantities for a long time.
Disclosure of Invention
In view of the above problems, embodiments of the present invention have been made to provide a method of manufacturing a multi-material laminated electrode that overcomes or at least partially solves the above problems.
The embodiment of the invention discloses a preparation method of a multi-material laminated electrode, which comprises the following steps:
laminating and combining a first preset number of first metal foils and a second preset number of second metal foils to form a metal laminate; wherein the resistivity of the first metal foil is greater than the resistivity of the second metal foil;
performing a first processing treatment on the metal lamination;
carrying out second processing treatment on the metal laminated layer by adopting preset parameters to form an electrode blank;
and carrying out electric spark machining treatment on the electrode blank to form a preset working surface profile to obtain the target electrode.
Further, the step of performing a first processing on the edge of the metal stack includes:
clamping the metal lamination by using two parallel metal plates;
and fixing the metal lamination with the metal plates arranged on the two sides in a clamp.
Further, after the step of fixing the metal laminate provided with the metal plates on both sides in the jig, the method includes:
and performing wire electrical discharge machining of a preset path on the metal lamination with the metal plates arranged on the two sides to obtain the metal lamination with the metal plates arranged on the two sides in a preset shape.
Further, the step of performing a second processing on the metal laminate by using preset parameters to form an electrode blank includes:
and carrying out dry wire electrical discharge machining on the side surface of the metal lamination layer with the metal plates arranged on the two sides of the preset shape by adopting a first preset sub-parameter, so that the side wall of the metal lamination layer generates a fused connection layer structure.
Further, the step of performing a dry wire electrical discharge machining operation on a side surface of the metal laminate having the metal plates on both sides of the preset shape by using the first preset sub-parameter to form a fused connection layer structure on a side wall of the metal laminate includes:
performing dry wire cut electrical discharge machining on the metal laminate with the metal plates arranged on the two sides of the preset shape by adopting a second preset sub-parameter to correct the size of the metal laminate;
and removing the metal plate protruding out of the clamp part by adopting wire cut electrical discharge machining.
Further, the target electrode has a dimension length that is a length of the metal stack exposed to the jig.
Further, the first preset sub-parameter and the second preset sub-parameter include one or more of a machining current value, a machining voltage value, and a machining speed.
Further, the machining current value in the first preset sub-parameter is greater than the machining current value in the second preset sub-parameter.
Further, the melting point of the first metal foil is lower than the melting point of the second metal foil.
Further, the first preset number is greater than the second preset number.
Compared with the prior art, the embodiment of the invention has the following advantages:
in the embodiment of the invention, a metal lamination is formed by laminating and combining a first preset number of first metal foils and a second preset number of second metal foils; wherein the resistivity of the first metal foil is greater than the resistivity of the second metal foil; performing a first processing treatment on the metal lamination; carrying out second processing treatment on the metal laminated layer by adopting preset parameters to form an electrode blank; and carrying out electric spark machining treatment on the electrode blank to form a preset working surface profile to obtain the target electrode. The laminated electrode with the length of tens of millimeters can be simply and quickly prepared; compared with a micro-columnar electrode and a thin electrode, the laminated electrode has longer service life, can process a plurality of micro grooves at one time and has higher processing efficiency; the laminated electrode has relatively large cross section size, strong anti-interference capability and good processing stability, and is particularly suitable for the electric spark processing of large-batch blind micro grooves.
Drawings
FIG. 1 is a flow chart illustrating the steps of one embodiment of a method for fabricating a multi-material laminated electrode according to the present invention;
FIG. 2 is a schematic side view of an electrode blank for wire cut electrical discharge machining according to an embodiment of the method for manufacturing a multi-material laminated electrode of the present invention;
FIG. 3 is a schematic side view of a dry wire cut electrical discharge machining rough machined electrode blank according to one embodiment of the method for manufacturing a multi-material laminated electrode of the present invention;
FIG. 4 is a schematic side view of an electrode blank for dry wire-cut electrical discharge machining and metal plate removal in accordance with one embodiment of the method for manufacturing a multi-material laminated electrode of the present invention;
fig. 5 is a schematic side view of a target electrode obtained by spark self-depletion according to an embodiment of the method for manufacturing a multi-material laminated electrode of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, there is shown a method for preparing a multi-material laminated electrode of the present invention, comprising:
s110, laminating and combining a first preset number of first metal foils and a second preset number of second metal foils to form a metal laminate; wherein the resistivity of the first metal foil is greater than the resistivity of the second metal foil;
s120, performing first processing treatment on the metal laminated layer;
s130, performing second processing treatment on the metal laminated layer by adopting preset parameters to form an electrode blank;
and S140, carrying out electric spark machining on the electrode blank to form a preset working surface profile, and obtaining the target electrode.
Compared with the prior art, the embodiment of the invention has the following advantages:
in the embodiment of the invention, a metal lamination is formed by laminating and combining a first preset number of first metal foils and a second preset number of second metal foils; wherein the resistivity of the first metal foil is greater than the resistivity of the second metal foil; performing a first processing treatment on the metal lamination; carrying out second processing treatment on the metal laminated layer by adopting preset parameters to form an electrode blank; and carrying out electric spark machining treatment on the electrode blank to form a preset working surface profile to obtain the target electrode. The laminated electrode with the length of tens of millimeters can be simply and quickly prepared; compared with a micro-columnar electrode and a thin electrode, the laminated electrode has longer service life, can process a plurality of micro grooves at one time and has higher processing efficiency; the laminated electrode has relatively large cross section size, strong anti-interference capability and good processing stability, and is particularly suitable for the electric spark processing of large-batch blind micro grooves.
Next, a method of producing the multi-material laminated electrode in the present exemplary embodiment will be further described.
As described in step S110, a first preset number of first metal foils and a second preset number of second metal foils are stacked and combined to form a metal stack; wherein the resistivity of the first metal foil is greater than the resistivity of the second metal foil; wherein the first metal foil has a melting point lower than that of the second metal foil; the first metal foils and the second metal foils are arranged at intervals in a lamination combination mode, the number of the first metal foils is more than that of the second metal foils, and the outermost metal foils on the two sides of the metal lamination are necessarily the first metal foils.
As described in step S120, the metal stack is subjected to a first processing.
In an embodiment, the specific process of "fixing the metal stack" in step S120 can be further described with reference to the following description.
The method comprises the following steps of clamping the metal lamination by two parallel metal plates; when the metal lamination is fixed, a clamp is generally adopted to fix the metal lamination, and because the thickness of the metal foil in the metal lamination is very thin, before the metal lamination is clamped by an upper clamp, a metal plate with the size slightly smaller than that of the metal lamination is generally adopted to clamp the metal lamination;
fixing the metal lamination with the metal plates arranged on the two sides in a clamp, and placing the metal lamination clamped by the metal plates into the clamp for clamping so as to prevent the metal lamination from deforming due to the clamp; the material of the metal plate is preferably a high-rigidity metal material, such as: stainless steel sheet, hard alloy plate.
In an embodiment, the specific process of "performing the first processing on the metal stack" in step S120 can be further described with reference to the following description.
And performing wire electric discharge machining of a preset path on the metal lamination with the metal plates arranged on the two sides to obtain the metal lamination with the metal plates arranged on the two sides in a preset shape.
In general, the wire-cut electric discharge machining is non-dry electric discharge machining, and is performed in a predetermined path to obtain a laminated electrode material having a predetermined shape
As mentioned in step S130, performing a second processing on the metal stack by using preset parameters to form an electrode blank;
in an embodiment, the specific process of "performing the second processing on the metal stack to form the electrode blank using the preset parameters" in step S130 can be further described with reference to the following description.
In the method, the side surface of the metal laminate having the metal plates on both sides of the predetermined shape is subjected to dry wire electrical discharge machining using a first predetermined sub-parameter to form a fused connection layer structure on the side wall of the metal laminate, and the side wall of the metal laminate is subjected to dry wire electrical discharge machining using a large energy parameter (current 2.1A) to form a fused connection layer on the side wall of the metal laminate by using instantaneous heat generated by spark discharge, thereby closely connecting the metal foils of the respective layers on the side surface.
In an embodiment, the specific process of "performing the second processing on the metal stack to form the electrode blank using the preset parameters" in step S130 can be further described with reference to the following description.
Performing dry wire electrical discharge machining on the metal laminate with the metal plates arranged on the two sides of the preset shape by adopting a second preset sub-parameter to correct the size of the metal laminate; the sidewalls of the metal stack can be dry wire-cut electro-discharge machined with small energy parameters (current 0.42A) to improve electrode preparation accuracy.
The metal plate at the projecting jig portion may be removed by wire electric discharge machining, and after the finish machining, the metal plate having a large rigidity at both sides of the electrode may be removed by wire electric discharge machining, thereby obtaining an electrode blank that is substantially integral, as described in the following procedure.
It should be noted that the first preset sub-parameter and the second preset sub-parameter include one or more of a machining current value, a machining voltage value and a machining speed, in the implementation of the present invention, a current value is preferred, and in the implementation of the present invention, the machining current value in the first preset sub-parameter is greater than the machining current value in the second preset sub-parameter,
it should be noted that, in any embodiment of the present invention, the large energy parameter and the small energy parameter are only described in a relative manner, that is, the high ratio of the two is the large energy parameter, and the low ratio is the small energy parameter.
As described in step S140, the electrode blank is subjected to an electric discharge machining process to form a preset working surface profile, so as to obtain a target electrode. And utilizing the different electrical discharge machining loss rates of the metal foils in the metal lamination layer caused by the different resistivity and melting points of the first metal foil and the second metal foil to ensure that the end surfaces of the metal lamination layer gradually lose to form a stable preset working surface profile, thereby obtaining the laminated target electrode with the micro-groove connection structure, wherein the size length of the target electrode is the length of the metal lamination layer exposed out of the clamp.
It should be noted that, when the electrode manufactured by the method of the present invention is used for electrical discharge machining, the machining of the micro-groove of the workpiece depends on the second metal foil with low resistivity in the laminated electrode, and the first metal foil with high resistivity in the electrode plays a role in supporting and anti-destabilizing the second metal foil with low resistivity in real time, so that the rigidity is improved, and therefore, the method is particularly suitable for the electrical discharge machining of the blind micro-groove with a large depth-to-width ratio.
In one embodiment, as shown in FIGS. 2-5, the first metal foil stock used in this embodiment is 300 μm thick tin foil, the second metal foil stock is 50 μm thick copper foil, and the metal plate stock is stainless steel sheet.
The preparation steps are as follows:
first, 4 sheets of 300 μm tin foil and 3 sheets of 50 μm copper foil are alternately laminated and combined, and sandwiched between two stainless steel sheets having high rigidity. The target electrode is clamped and fixed through a clamp, and the length required by exposing the target electrode is 30 mm;
secondly, machining according to a given path by adopting wire electrical discharge machining to obtain a primary electrode blank, as shown in figure 1;
thirdly, performing dry wire electrical discharge machining rough machining on the side wall of the electrode blank by adopting a current parameter of 2.1A, and generating a layer of molten connection layer on the side wall of the electrode blank by using instantaneous heat generated by spark discharge so as to tightly connect metal foils of each layer of the electrode blank on the side surface of an electrode, as shown in figure 2;
fourthly, performing dry type wire-cut electrical discharge machining on the side wall of the electrode blank by adopting a current parameter of 0.42A to improve the electrode preparation precision, and then removing stainless steel sheets on two sides of the electrode blank by adopting wire-cut electrical discharge machining to obtain the electrode blank which is similar to a whole, as shown in figure 3;
fifthly, using the electrode blank to carry out multiple rounds of electric spark machining with fixed depth at different positions of the same metal workpiece, using metal foils made of different materials to have different electric spark machining loss rates, gradually losing the end face of the laminated electrode to form a preset working face profile, thereby obtaining a target electrode, and then using the target electrode to prepare a blind micro-groove structure through micro electric spark machining, as shown in figure 4. When the electrode manufactured by the method is used for electric spark machining, the machining of the micro-groove of the workpiece depends on the second metal foil with low resistivity in the laminated electrode, the first metal foil with high resistivity in the electrode plays a role in supporting and resisting instability in real time on the second metal foil with low resistivity, and the rigidity is improved, so that the method is particularly suitable for electric spark machining of the blind micro-groove with a large depth-width ratio.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The above method for preparing a multi-material laminated electrode provided by the present invention is described in detail, and the principle and the embodiment of the present invention are explained by applying specific examples herein, and the description of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A method for preparing a multi-material laminated electrode is characterized by comprising the following steps:
laminating and combining a first preset number of first metal foils and a second preset number of second metal foils to form a metal laminate; wherein the resistivity of the first metal foil is greater than the resistivity of the second metal foil;
performing a first processing treatment on the metal lamination;
carrying out second processing treatment on the metal laminated layer by adopting preset parameters to form an electrode blank;
and carrying out electric spark machining treatment on the electrode blank to form a preset working surface profile to obtain the target electrode.
2. The method of claim 1, wherein the step of subjecting the edge of the metal stack to a first machining process comprises:
clamping the metal lamination by using two parallel metal plates;
and fixing the metal lamination with the metal plates arranged on the two sides in a clamp.
3. The method of claim 2, further comprising, after the step of securing the metal stack with metal plates on both sides in a fixture:
and performing wire electrical discharge machining of a preset path on the metal lamination with the metal plates arranged on the two sides to obtain the metal lamination with the metal plates arranged on the two sides in a preset shape.
4. The method of claim 3, wherein the step of performing a second processing on the metal stack to form an electrode blank using the predetermined parameters comprises:
and carrying out dry wire electrical discharge machining on the side surface of the metal lamination layer with the metal plates arranged on the two sides of the preset shape by adopting a first preset sub-parameter, so that the side wall of the metal lamination layer generates a fused connection layer structure.
5. The method according to claim 4, wherein after the step of performing a dry wire electrical discharge machining operation on the side surface of the metal laminate layer provided with the metal plates on both sides of the preset shape by using the first preset sub-parameter to generate the fused connection layer structure on the side wall of the metal laminate layer, the method further comprises:
performing dry wire cut electrical discharge machining on the metal laminate with the metal plates arranged on the two sides of the preset shape by adopting a second preset sub-parameter to correct the size of the metal laminate;
and removing the metal plate protruding out of the clamp part by adopting wire cut electrical discharge machining.
6. The method of claim 5, wherein the target electrode has a dimensional length that is the length of the metal stack exposed to the fixture.
7. The method according to claim 5, wherein the first and second preset sub-parameters comprise one or more of a machining current value, a machining voltage value and a machining speed.
8. The method of claim 7, wherein the machining current value in the first preset sub-parameter is greater than the machining current value in the second preset sub-parameter.
9. The method of claim 1, wherein the first metal foil has a melting point lower than a melting point of the second metal foil.
10. The method of claim 1, wherein the first predetermined number is greater than the second predetermined number.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113199095A (en) * | 2021-05-28 | 2021-08-03 | 深圳大学 | Surface micro-groove machining method and micro electric spark machining device |
| CN114101821A (en) * | 2021-11-04 | 2022-03-01 | 深圳大学 | Electrode and preparation method thereof, helical gear forming die and helical gear |
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