CN112276266B - Machining device and machining method for bent micro-channel structure - Google Patents
Machining device and machining method for bent micro-channel structure Download PDFInfo
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- CN112276266B CN112276266B CN202011041005.0A CN202011041005A CN112276266B CN 112276266 B CN112276266 B CN 112276266B CN 202011041005 A CN202011041005 A CN 202011041005A CN 112276266 B CN112276266 B CN 112276266B
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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
- B23H11/003—Mounting of workpieces, e.g. working-tables
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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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- Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention provides a processing device and a processing method of a bent micro-channel structure, which are used for processing a workpiece, wherein the processing device comprises: the guide fixture comprises a processing plane, and a bending gap extending in a bending way extends on the processing plane; a strip electrode extending through the curved slit, one side of the strip electrode protruding out of the work plane; the wiring mechanism is in transmission connection with the strip-shaped electrode and drives the strip-shaped electrode to perform bending operation in the bending gap; and the feeding mechanism drives the workpiece to move perpendicular to the processing plane, and the ribbon electrode is electrified and spark-processed on the workpiece to form a corresponding bent micro-channel structure. By applying the technical scheme, the processing device and the processing method for processing the bent micro-channel structure can be provided.
Description
Technical Field
The invention relates to a processing device and a processing method of a bent micro-channel structure.
Background
The microchannel structure has the advantages of simple structure, large specific surface area and the like, and is commonly used in the fields of radiators, microreactors and the like. In recent years, with the wide application of microchannel structures, curved microchannel structures have become the focus of research by researchers at home and abroad. Many studies have shown that curved microchannels have better heat transfer efficiency than straight microchannels, and that the flow characteristics of the medium are better than those of straight microchannels at low flow rates. However, an efficient machining and manufacturing method of the curved micro-channel structure is still lacked, which results in that many researches on the curved micro-channel structure only stay in the theoretical calculation and model simulation stages, and the experimental verification of a real object is difficult. Therefore, the development of a novel and efficient processing method for the bent micro-channel structure has important scientific research value.
At present, the processing method of the micro-channel structure mainly comprises precision milling, laser processing, chemical etching, forming processing and the like. However, these processing methods generally have the problems of high processing cost, low processing efficiency, small material application range, and the like in the processing of the microchannel structure. Wire cut electrical discharge machining has the characteristics of no contact, no macroscopic cutting force and wide material application range, is one of the most ideal methods for processing a micro-structure, and is also commonly used for processing a micro-channel structure. However, the conventional wire electric discharge machining method always has the problems of low machining efficiency, high wire breakage risk and the like in the micro-channel structure. In addition, in the common wire-cut electrical discharge machining process, the wire electrode is always in a stretched state and can only be used for machining a flat micro-channel structure but cannot be used for machining a bent micro-channel structure.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned deficiencies in the prior art and providing a curved microchannel structure.
In order to solve the above technical problem, the present invention provides a device for processing a curved micro-channel structure, which is used for processing a workpiece, and comprises:
the guide fixture comprises a processing plane, and a bending gap extending in a bending way extends on the processing plane;
a strip electrode extending through the curved slit, one side of the strip electrode protruding out of the work plane;
the wiring mechanism is in transmission connection with the strip-shaped electrode and drives the strip-shaped electrode to perform bending operation in the bending gap;
and the feeding mechanism drives the workpiece to move perpendicular to the processing plane, and the ribbon electrode is electrified and spark-processed on the workpiece to form a corresponding bent micro-channel structure.
Preferably, the guide fixture comprises a first fixture and a second fixture, the first fixture and the second fixture are respectively provided with curved surfaces in opposite directions, and the two curved surfaces are spaced apart to define the curved gap.
Preferably, the separation distance between the two curved surfaces is equal everywhere and is greater than the thickness of the strip-shaped electrode.
Preferably, the curved surface is a smooth transition curved surface.
Preferably, the curved surface is a sinusoidal surface.
Preferably, the wire feeding device further comprises a connecting fixing piece and a rack, the wiring mechanism and the feeding mechanism are arranged on the rack, the guiding fixture is arranged on the connecting fixing piece, and the connecting fixing piece is connected with the rack.
Preferably, the routing mechanism comprises a belt feeding guide wheel and a belt discharging guide wheel, the belt feeding guide wheel is arranged at the belt feeding end of the bending gap, the belt discharging guide wheel is arranged at the belt discharging end of the bending gap, and the belt-shaped electrode extends through the belt feeding guide wheel, the bending gap and the belt discharging guide wheel.
The invention also provides a processing method of the bent micro-channel structure, which is suitable for processing workpieces, and the processing device using the bent micro-channel structure comprises the following steps:
s1: the strip-shaped electrode is driven by a wiring mechanism to perform bending operation in the bending gap;
s2: the workpiece is driven by the feeding mechanism to feed in a direction perpendicular to the processing plane, and the maximum feeding depth of the workpiece does not exceed the height of the strip-shaped electrode protruding out of the processing plane;
s3: and the strip electrode carries out electric spark machining on the workpiece to obtain a single wavy micro-channel structure on the workpiece.
Preferably, the method further comprises the following steps:
s4: the process feed process is repeated to obtain an array of curved microchannel structures.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the invention replaces the traditional wire electrode for wire cut electrical discharge machining with a strip electrode, bends and shapes the strip electrode under the condition of not influencing the moving of the strip electrode through a certain shaping guide clamp, and utilizes the strip electrode to machine the bent micro-channel, the machining method has the advantages of no contact, no macroscopic cutting force, wide material application range, high machining efficiency, low wire breaking risk and the like, the common wire cut electrical discharge machining method always has the problems of low machining efficiency, high wire breaking risk and the like for the micro-channel structure with the width of less than 100 mu m, and the invention is very suitable for machining the bent micro-channel structure with the width of less than 100 mu m;
2. the invention provides a method for manufacturing a strip electrode by using a bending guide clamp, which is characterized in that the strip electrode keeps stable running motion under a bending condition and performs discharge machining on a bent micro-channel structure for the first time.
Drawings
FIG. 1 is a perspective view of a first perspective of a processing apparatus in accordance with a preferred embodiment of the present invention;
FIG. 2 is an enlarged, partial perspective view of a first perspective of the machining apparatus in accordance with the preferred embodiment of the present invention, showing one side of the strip electrode projecting above the machining plane;
FIG. 3 is a perspective view of a second perspective of the processing device in accordance with the preferred embodiment of the present invention;
FIG. 4 is an enlarged, fragmentary, perspective view of a second perspective of the machining apparatus of the preferred embodiment of the present invention, showing a workpiece adjacent a machining plane and a strip electrode for spark-forming a curved microchannel structure in the workpiece;
FIG. 5 is a perspective view of the connection fixture and the guiding fixture in accordance with the preferred embodiment of the present invention;
FIG. 6 is a perspective view of the connection of the first clamp and the second clamp in the preferred embodiment of the present invention;
FIG. 7 is a schematic perspective view of a workpiece showing an array of serpentine microchannel structures in accordance with a preferred embodiment of the invention.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
Certain directional terms used hereinafter to describe the drawings, such as "inner", "outer", "above", "below", and other directional terms, will be understood to have their normal meaning and refer to those directions as they normally relate to when viewing the drawings. Unless otherwise indicated, the directional terms described herein are generally in accordance with conventional directions as understood by those skilled in the art.
The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.
Referring to fig. 1-7, a processing device 100 for a curved microchannel structure 210, the processing device 100 for processing a workpiece 200, the workpiece 200 being a heat sink or a microreactor, etc. The machining device 100 includes a frame 1, a connecting fixture 2, a guiding fixture 3, a strip electrode 4, a routing mechanism, and a feeding mechanism (not shown), where the frame 1 is used to be connected to a common electric spark machine 300, the electric spark machine 300 is used to apply electric spark machining conditions such as pulse current and auxiliary working fluid to the machining device 100, and the electric spark machine 300 is a common mechanical device and is not described herein again.
The frame 1 is a plate-shaped structure, a plurality of fixing holes 11 are arranged at intervals on the frame 1, the frame 1 can be fixed to the electric spark machine 300 through 4 fixing holes 11, and the electric spark machine 300 can be fastened and connected with fastening elements such as bolts and the like, so that the electric spark machine 300 can be conveniently and adaptively connected.
One side of frame 1 is provided with a connecting groove 12, connecting groove 12 is square structure, direction anchor clamps 3 set up connect mounting 2, connect mounting 2 reconnection to in the frame 1, connect mounting 2 passes wherein 4 fixed orificess 11 fixed connection to frame 1 through 4 bolts, direction anchor clamps 3 embedding in the connecting groove 12. The guide clamp 3 comprises a processing plane 31, the processing plane 31 protrudes out of the outward surface of the rack 1, the processing plane 31 extends to form a bending gap 32 extending in a bending mode, the strip electrode 4 extends to form the bending gap 32, one side of the strip electrode 4 protrudes out of the processing plane 31, the routing mechanism is in transmission connection with the strip electrode 4 and drives the strip electrode 4 to perform bending operation in the bending gap 32, the feeding mechanism drives the workpiece 200 to vertically move with the processing plane 31, and the strip electrode 4 performs electric spark machining on the workpiece 200 to form a corresponding bending micro-channel structure 210.
The guide fixture 3 comprises a first fixture 33 and a second fixture 34, the first fixture 33 and the second fixture 34 are respectively provided with curved surfaces 35 in opposite directions, and the two curved surfaces 35 are spaced apart to define the curved gap 32. The first clamp 33 includes a first base 331 and a first protrusion 332, the first protrusion 332 is vertically connected to the first base 331, one curved surface 35 is disposed on a surface of the first protrusion 332 away from the first base 331, the second clamp 34 includes a second base 341 and a second protrusion 342, the second protrusion 342 is vertically connected to the second base 341, the other curved surface 35 is disposed on a surface of the second protrusion 342 away from the second base 341, the first protrusion 332 and the second protrusion 342 are assembled to each other to make the two curved surfaces 35 cooperate to define the curved gap 32, at this time, the first base 331 and the second base 341 cooperate to define a connection base 36, and the connection base 36 is embedded in the connection slot 12.
The distance between the two curved surfaces 35 is equal at any position and slightly greater than the thickness of the strip-shaped electrode 4, which can prevent the strip-shaped electrode 4 from getting jammed when routing in the curved gap 32, in this embodiment, the curved surfaces 35 are smooth curved surfaces, more specifically, the curved surfaces 35 are sinusoidal curved surfaces, the curved surfaces 35 can be designed according to the shape of the curved micro-channel structure 210 to be actually processed, different guiding jigs 3 can be adopted in different curved micro-channel structures 210, for example, an arc curved surface can be adopted to obtain the arc-shaped curved micro-channel structure 210, and the strip-shaped electrode 4 can be bent into different curves under the corresponding curved surfaces 35.
The routing mechanism comprises a belt feeding guide wheel 51 and a belt discharging guide wheel 52, the belt feeding guide wheel 51 is arranged at a belt feeding end 321 of the bending gap 32, the belt discharging guide wheel 52 is arranged at a belt discharging end 322 of the bending gap 32, the belt-shaped electrode 4 extends through the belt feeding guide wheel 51, the bending gap 32 and the belt discharging guide wheel 52, and the belt discharging guide wheel 52 drives the belt-shaped electrode 4 to bend and run in the bending gap 32. The tape feed roller 51 includes two first guide rollers 511 spaced apart from each other, and the strip electrode 4 passes through the lower side of the first guide roller 511 and then the upper side of the second first guide roller 511, and then enters the bending slit 32, the tape-out guide wheel 52 comprises two spaced second guide wheels 521, the strip-shaped electrode 4 passes through the lower side of the first second guide wheel 521 and then passes through the upper side of the second guide wheel 521 after coming out of the tape-out end 322 of the bending gap 32, the tape feed roller 51 and the tape discharge roller 52 can tension the strip electrode 4 and ensure that the strip electrode 4 is kept straight at the tape feed end 321 and the tape discharge end 322, the routing mechanism further comprises a driving member (not shown), the driving member drives the strip-shaped electrode 4 to run in the belt feeding guide wheel 51, the belt discharging guide wheel 52 and the guiding fixture 3, and the driving member is a common mechanical structure and will not be described in detail herein.
The feeding mechanism is used for driving the workpiece 200 to move vertically to the processing plane 31, the feeding mechanism may be a common reciprocating mechanism, such as a conventional machine tool or a conventional numerical control machine tool, the feeding mechanism may drive the workpiece 200 to move toward and away from the strip electrode 4 for multiple times, after driving the workpiece 200 to process a first curved micro-channel structure 210, the feeding mechanism may retract and drive the workpiece 200 to process a second curved micro-channel structure 210 again, the first curved micro-channel structure 210 and the second curved micro-channel structure are spaced apart in parallel, the feeding mechanism may repeatedly drive the workpiece 200 to process multiple curved micro-channel structures 210 on the strip electrode 4, and it may also control the spacing distance between two adjacent curved micro-channel structures 210 and the processing depth of a single curved micro-channel structure 210, and it should be noted that, the maximum feed depth of the workpiece 200 does not exceed the height of the strip electrode 4 projecting above the work plane 31.
The invention also discloses a processing method of the bent micro-channel structure, which is suitable for processing a workpiece 200, and the processing device 100 using the bent micro-channel structure is characterized by comprising the following steps:
s1: the strip-shaped electrode 4 is driven by a wiring mechanism to perform bending operation in the bending gap 32;
s2: the workpiece 200 is driven by the feeding mechanism to be fed in a direction perpendicular to the processing plane 31, and the maximum feeding depth of the workpiece 200 does not exceed the height of the strip electrode 4 protruding out of the processing plane 31;
s3: the strip-shaped electrode 4 carries out electric spark machining on the workpiece 200 to obtain a single wavy micro-channel structure on the workpiece 200;
s4: the process feed process is repeated to obtain an array of curved microchannel structures 210.
The above description is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any person skilled in the art can make insubstantial changes in the technical scope of the present invention within the technical scope of the present invention, and the actions infringe the protection scope of the present invention are included in the present invention.
Claims (8)
1. A curved microchannel structure processing apparatus for processing a workpiece, comprising:
the guide fixture comprises a processing plane, and a bending gap extending in a bending way extends on the processing plane;
a strip electrode extending through the curved slit, one side of the strip electrode protruding out of the work plane;
the wiring mechanism is in transmission connection with the strip-shaped electrode and drives the strip-shaped electrode to perform bending operation in the bending gap;
the feeding mechanism drives the workpiece to move perpendicular to the processing plane, and the strip-shaped electrode carries out electric spark processing on the workpiece to form a corresponding bent micro-channel structure;
the wiring mechanism comprises a belt feeding guide wheel and a belt discharging guide wheel, the belt feeding guide wheel is arranged at the belt feeding end of the bending gap, the belt discharging guide wheel is arranged at the belt discharging end of the bending gap, and the belt-shaped electrode extends through the belt feeding guide wheel, the bending gap and the belt discharging guide wheel.
2. The curved microchannel structure processing device of claim 1, wherein: the guide fixture comprises a first fixture and a second fixture, wherein the first fixture and the second fixture are respectively provided with curved surfaces in opposite directions, and the two curved surfaces are spaced and define a curved gap.
3. The curved microchannel structure processing device of claim 2, wherein: the interval distance between the two curved surfaces is equal everywhere and is larger than the thickness of the strip-shaped electrode.
4. The curved microchannel structure processing device of claim 2, wherein: the curved surface is a smooth transition curved surface.
5. The curved microchannel structure processing device of claim 4, wherein: the curved surface is a sinusoidal surface.
6. The curved microchannel structure processing device of claim 2, wherein: the wire feeding mechanism is characterized by further comprising a connecting fixing piece and a rack, the wiring mechanism and the feeding mechanism are arranged on the rack, the guiding clamp is arranged on the connecting fixing piece, and the connecting fixing piece is connected with the rack.
7. A method of processing a curved microchannel structure, suitable for processing a workpiece, using the apparatus for processing a curved microchannel structure according to any one of claims 1 to 6, comprising the steps of:
s1: the strip-shaped electrode is driven by a wiring mechanism to perform bending operation in the bending gap;
s2: the workpiece is driven by the feeding mechanism to feed in a direction perpendicular to the processing plane, and the maximum feeding depth of the workpiece does not exceed the height of the strip-shaped electrode protruding out of the processing plane;
s3: and the strip electrode carries out electric spark machining on the workpiece to obtain a single wavy micro-channel structure on the workpiece.
8. The method of fabricating a curved microchannel structure of claim 7, further comprising the steps of:
s4: the process feed process is repeated to obtain an array of curved microchannel structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011041005.0A CN112276266B (en) | 2020-09-28 | 2020-09-28 | Machining device and machining method for bent micro-channel structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011041005.0A CN112276266B (en) | 2020-09-28 | 2020-09-28 | Machining device and machining method for bent micro-channel structure |
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| CN112276266A CN112276266A (en) | 2021-01-29 |
| CN112276266B true CN112276266B (en) | 2022-03-15 |
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| CN114700568B (en) * | 2022-04-14 | 2023-06-16 | 南京工业大学 | Method and device for processing groove structure by combining electric spark and electrolysis of belt electrode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE2927906A1 (en) * | 1979-07-11 | 1981-01-29 | Audi Nsu Auto Union Ag | Electro erosion machining of narrow slits in strip material - achieving high dimensional accuracy by using strip bowed across its width |
| CN102091840A (en) * | 2009-12-11 | 2011-06-15 | 财团法人工业技术研究院 | Wire cut electrical discharge machining device |
| CN201644967U (en) * | 2010-04-06 | 2010-11-24 | 苏州电加工机床研究所有限公司 | Electrode strap inclined-drawing mechanism for anode mechanical cutting machine tool |
| CN109967810B (en) * | 2019-04-16 | 2020-05-12 | 厦门大学 | Multi-wire electric spark cutting machining method for straight-line curved surface |
| CN110434415B (en) * | 2019-08-13 | 2021-08-31 | 南京航空航天大学 | Wire-electrode cutting bent wire detection method based on auxiliary parallel electrodes |
| CN210731278U (en) * | 2019-10-18 | 2020-06-12 | 深圳山源电器股份有限公司 | Electric spark cutting device with strip-shaped electrode |
| CN111843082A (en) * | 2020-07-22 | 2020-10-30 | 马新国 | ECM device for electrochemical machining of narrow groove |
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