CN110814450B - Preparation method of multi-material laminated electrode - Google Patents

Abstract

An embodiment of the present invention provides a method for preparing a multi-material laminated electrode, comprising: 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; the first processing is performed on the metal stack; the second processing is performed on the metal stack by using preset parameters to form an electrode blank; The electrode blank is subjected to EDM processing to form a preset working surface profile to obtain a target electrode. Laminated electrodes with a length of tens of millimeters can be easily and quickly prepared; compared with micro-columnar electrodes and sheet electrodes, the laminated electrodes have a longer service life, and can process multiple micro-grooves at one time, with higher processing efficiency; The cross-sectional size of the laminated electrode is relatively large, the anti-interference ability is strong, and the processing stability is good.

Description

A kind of preparation method of multi-material laminated electrode

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 technique

Micro EDM is a non-contact machining, which has the advantages of no macro cutting force and can process any conductive material. It is an important technical means to prepare surface blind micro-groove structures on difficult-to-machine materials. At present, micro-columnar electrodes are mainly used layer by layer. Scanning electrical discharge machining and sheet electrode up and down reciprocating electrical discharge machining are obtained. However, in the process of EDM, the tool electrode inevitably suffers loss, especially the tiny electrode used for microstructure processing has greater loss, thus reducing the service life of the tool electrode, and it is difficult to continuously process the surface blind microstructure in large quantities for a long time. trench structure.

SUMMARY OF THE INVENTION

In view of the above problems, embodiments of the present invention are proposed to provide a method for manufacturing a multi-material laminated electrode that overcomes the above problems or at least partially solves the above problems.

The embodiment of the present invention discloses a preparation method of a multi-material laminated electrode, including:

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;

performing a first process on the metal stack;

Perform a second processing on the metal stack using preset parameters to form electrode blanks;

The electrode blank is subjected to EDM processing to form a preset working surface profile to obtain a target electrode.

Further, the step of performing the first processing on the edge of the metal stack includes:

The metal stack is clamped by two mutually parallel metal plates;

The metal stack with metal plates on both sides is fixed in the fixture.

Further, after the step of fixing the metal stack with metal plates on both sides in the fixture, it includes:

The metal stack with metal plates on both sides is subjected to wire EDM with a preset path to obtain the metal stack with metal plates on both sides of a preset shape.

Further, the step of using preset parameters to perform a second processing on the metal stack to form an electrode blank includes:

Using the first preset sub-parameters, dry EDM is performed on the side surfaces of the metal stacks with metal plates on both sides of the preset shape, so that the sidewalls of the metal stacks generate a fusion connection layer structure .

Further, dry EDM is performed on the side of the metal stack with metal plates on both sides of the preset shape by using the first preset sub-parameter, so that the side of the metal stack is After the step of forming a fusion-bonded layer structure of the wall, comprising:

Using the second preset sub-parameter to perform dry wire electrical discharge machining on the metal stack with metal plates on both sides of the preset shape to correct the size of the metal stack;

The metal plate protruding from the clamp portion is removed using a wire EDM process.

Further, the size length of the target electrode is the length of the metal stack exposed on the fixture.

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 embodiments of the present invention include the following advantages:

In this embodiment of the present invention, a metal laminate is formed by stacking 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 that of the second metal foil. The resistivity of the metal foil; the first processing is performed on the metal stack; the second processing is performed on the metal stack by using preset parameters to form an electrode blank; Set the profile of the working surface to obtain the target electrode. Laminated electrodes with a length of tens of millimeters can be prepared simply and quickly; compared with micro-columnar electrodes and sheet electrodes, the laminated electrodes have a longer service life, and can process multiple micro-grooves at one time, with higher processing efficiency; The cross-sectional size of the laminated electrode is relatively large, the anti-interference ability is strong, and the processing stability is good, and it is especially suitable for the EDM of large quantities of blind micro grooves.

Description of drawings

1 is a flow chart of the steps of an embodiment of a method for preparing a multi-material laminated electrode of the present invention;

2 is a schematic side view of an electrode blank of a method for preparing a multi-material laminated electrode of the present invention, which is specifically realized by wire electric discharge machining;

3 is a schematic side view of a rough-processed electrode blank of a method for preparing a multi-material laminated electrode of the present invention—a concrete implementation of dry wire electrical discharge cutting;

4 is a schematic side view of the electrode blank for the preparation method of a multi-material laminated electrode of the present invention, a concrete realization of dry wire EDM finishing and removal of metal plates;

FIG. 5 is a schematic side view of a target electrode obtained by a method for preparing a multi-material laminated electrode of the present invention, which is specifically realized by self-dissipation of electric sparks.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to FIG. 1, a method for preparing a multi-material laminated electrode of the present invention is shown, including:

S110. Laminate and combine a first preset number of first metal foils and a second preset number of second metal foils to form a metal stack; wherein the resistivity of the first metal foil is greater than the resistivity of the second metal foil ;

S120, performing a first processing on the metal stack;

S130, using preset parameters to perform second processing on the metal stack to form an electrode blank;

S140 , performing EDM processing on the electrode blank to form a preset working surface profile to obtain a target electrode.

Compared with the prior art, the embodiments of the present invention include the following advantages:

In this embodiment of the present invention, a metal laminate is formed by stacking 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 that of the second metal foil. The resistivity of the metal foil; the first processing is performed on the metal stack; the second processing is performed on the metal stack by using preset parameters to form an electrode blank; Set the profile of the working surface to obtain the target electrode. Laminated electrodes with a length of tens of millimeters can be prepared simply and quickly; compared with micro-columnar electrodes and sheet electrodes, the laminated electrodes have a longer service life, and can process multiple micro-grooves at one time, with higher processing efficiency; The cross-sectional size of the laminated electrode is relatively large, the anti-interference ability is strong, and the processing stability is good, and it is especially suitable for the EDM of large quantities of blind micro grooves.

Next, the preparation method of the multi-material laminated electrode in this exemplary embodiment will be further described.

As described in the above 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 that of the second metal foil. The resistivity of the metal foil; wherein, the melting point of the first metal foil is lower than the melting point of the second metal foil; the stacking combination of the first metal foil and the second metal foil is alternately arranged, so The number of the first metal foils is greater than the number of the second metal foils, and the outermost metal foils on both sides of the metal stack must be the first metal foils.

As described in the above step S120, the first processing is performed on the metal stack.

In one embodiment, the specific process of "fixing the metal stack" in step S120 may be further described with reference to the following description.

As described in the following steps, two parallel metal plates are used to clamp the metal stack; when fixing, a clamp is generally used to fix the metal stack. Since the thickness of the metal foil in the metal stack is very thin, Before being clamped by the upper clamp, a metal plate with a size slightly smaller than the metal stack is generally used to clamp the metal stack;

As described in the following steps, fix the metal stack with metal plates on both sides in the fixture, and place the metal stack clamped by the metal plates into the fixture for clamping, so as to prevent the deformation of the metal stack caused by the fixture; The material of the metal plate is preferably a metal material with high rigidity, such as a stainless steel sheet and a cemented carbide plate.

In one embodiment, the specific process of "performing the first processing on the metal stack" in step S120 may be further described with reference to the following description.

As described in the following steps, the metal stack with metal plates on both sides is subjected to wire EDM with a preset path to obtain the metal stack with metal plates on both sides of a preset shape.

It should be noted that the wire EDM is generally non-dry EDM, which is processed according to a given path to obtain a laminated electrode blank with a preset shape

As described in the above step S130, using preset parameters to perform a second processing on the metal stack to form an electrode blank;

In one embodiment, the specific process of "using preset parameters to perform a second processing on the metal stack to form an electrode blank" in step S130 can be further described with reference to the following description.

As described in the following steps, the first preset sub-parameters are used to perform dry wire electric discharge cutting work on the side surfaces of the metal stack with metal plates on both sides of the preset shape, so that the side surfaces of the metal stack are The wall generates a fusion bonding layer structure, which can be roughed by dry wire EDM on the sidewall of the metal stack with a large energy parameter (current 2.1A), and the instantaneous heat generated by the spark discharge is used to make the metal stack. A layer of fusion bonding layer is formed on the side wall of the layer, so that each layer of metal foil is closely connected on the side.

In one embodiment, the specific process of "using preset parameters to perform a second processing on the metal stack to form an electrode blank" in step S130 can be further described with reference to the following description.

As described in the following steps, the second preset sub-parameter is used to perform dry wire electric discharge machining on the metal stack with metal plates on both sides of the preset shape to correct the size of the metal stack; The sidewalls of the metal stacks were subjected to dry wire EDM finishing with a small energy parameter (current 0.42A) to improve electrode fabrication accuracy.

As described in the following steps, wire EDM is used to remove the metal plate protruding from the fixture. After finishing the equipment, wire EDM can also be used to remove the metal plates with greater stiffness on both sides of the electrode, so as to obtain an approximate Integral electrode blank.

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, and in the implementation of the present invention, preferably a current value , 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 described large energy parameter and small energy parameter are only relative descriptions, that is, the higher ratio of the two is the higher energy parameter, and the lower ratio is the lower energy parameter.

As described in the above step S140, the electrode blank is subjected to EDM processing to form a preset working surface profile to obtain a target electrode. Due to the difference in resistivity and melting point of the first metal foil and the second metal foil, each layer of metal foil in the metal stack has different EDM loss rates, so that the end face of the metal stack is gradually lost to form a stable preset working surface contours, so as to obtain the target electrode with a micro-groove contact structure in a laminated shape, wherein the dimension length of the target electrode is the length of the metal stack exposed to the fixture.

It should be noted that, when using the electrode manufactured by the method of the present invention for EDM, the machining of the micro-grooves in 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. The second metal foil with low resistivity has the effect of real-time support and anti-instability, and improves the rigidity, so it is especially suitable for EDM machining of blind micro-grooves with large aspect ratio.

As shown in Figure 2-5, in a specific implementation, the first metal foil material used in this implementation is tin foil with a thickness of 300 μm, the second metal foil material is copper foil with a thickness of 50 μm, and the material of the metal plate is a stainless steel sheet.

The production steps are as follows:

1. Alternately stack 4 pieces of 300μm tin foil and 3 pieces of 50μm copper foil raw materials, and sandwich them between two stainless steel sheets with high rigidity. It is clamped and fixed by a clamp, and the length required to expose the target electrode is 30mm;

2. Use WEDM to process according to a given path to obtain the preliminary electrode blank, as shown in Figure 2;

3. The side wall of the electrode blank is subjected to dry EDM rough machining with a current parameter of 2.1A, and the instantaneous heat generated by spark discharge is used to form a layer of fusion connection layer on the side wall of the electrode blank, so that the The metal foils of each layer of the electrode blank are closely connected on the side of the electrode, as shown in Figure 3;

4. Use the current parameter of 0.42A to perform dry wire EDM finishing on the side wall of the electrode blank to improve the electrode preparation accuracy, and then use the wire EDM to remove the stainless steel sheets on both sides of the electrode blank, so as to obtain an approximate overall The electrode blank, as shown in Figure 4;

5. Use the electrode blank to carry out multiple rounds of EDM with a fixed depth at different positions of the same metal workpiece. Metal foils of different materials have different EDM loss rates, and the end face of the laminated electrode gradually wears out to form a preset The profile of the working surface was obtained to obtain the target electrode, as shown in Figure 5, which was then used for micro-EDM to fabricate the blind micro-groove structure. When EDM is carried out using electrodes produced by the method of the present invention, the machining of the microgrooves in the workpiece depends on the second metal foil of low resistivity in the laminated electrode, the first metal foil of high resistivity in the electrode to the low resistivity The second metal foil plays the role of real-time support and anti-instability, and improves the rigidity, so it is especially suitable for EDM of blind micro-grooves with large aspect ratio.

Although preferred embodiments of the embodiments of the present invention have been described, additional changes and modifications to these embodiments may be made by those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications that fall within the scope of the embodiments of the present invention.

Finally, it should also be noted that in this document, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply these entities or that there is any such actual relationship or sequence between operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or terminal device comprising a list of elements includes not only those elements, but also a non-exclusive list of elements. other elements, or also include elements inherent to such a process, method, article or terminal equipment. Without further limitation, an element defined by the phrase "comprises a..." does not preclude the presence of additional identical elements in the process, method, article or terminal device comprising said element.

The preparation method of a multi-material laminated electrode provided by the present invention has been described in detail above. In this paper, specific examples are used to illustrate the principles and implementations of the present invention. The descriptions of the above examples are only used to help understanding The method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be It is construed as a limitation of the present invention.

Claims (8)

1. a preparation method of multi-material laminated electrode, is characterized in that, comprises: 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; The first processing is performed on the metal stack; specifically, two mutually parallel metal plates are used to clamp the metal stack; the metal stack with metal plates on both sides is fixed in a fixture, and the metal stack is The plate material adopts high rigidity metal material; The metal stack is subjected to a second processing treatment using preset parameters to form an electrode blank; specifically, the side surfaces of the metal stack with metal plates on both sides of the preset shape are dry-processed by using the first preset sub-parameters. Wire-cut electric discharge work processing, so that the sidewall of the metal stack generates a fusion connection layer structure; The electrode blank is subjected to EDM processing to form a preset working surface profile to obtain a target electrode. 2. The method according to claim 1, characterized in that, after the step of fixing the metal stack with metal plates on both sides in the fixture, the method further comprises: The metal stack with metal plates on both sides is subjected to wire EDM with a preset path to obtain the metal stack with metal plates on both sides of the preset shape. 3 . The method according to claim 1 , wherein dry EDM is performed on the side surface of the metal stack provided with metal plates on both sides of the preset shape using the first preset sub-parameters. 4 . After the cutting work process, after the step of generating the fusion connection layer structure on the side wall of the metal stack, it also includes: Using the second preset sub-parameter to perform dry wire electrical discharge machining on the metal stack with metal plates on both sides of the preset shape to correct the size of the metal stack; The metal plate protruding from the clamp portion is removed using a wire EDM process. 4 . The method of claim 3 , wherein the dimension length of the target electrode is the length at which the metal stack is exposed to the jig. 5 . 5. The method according to claim 4, wherein the first preset sub-parameter and the second preset sub-parameter comprise one or more of a machining current value, a machining voltage value and a machining speed. 6 . The method according to claim 5 , wherein the machining current value in the first preset sub-parameter is greater than the machining current value in the second preset sub-parameter. 7 . 7. The method of claim 1, wherein the melting point of the first metal foil is lower than the melting point of the second metal foil. 8. The method of claim 1, wherein the first preset number is greater than the second preset number.

Images