CN107570821B - Micro-channel linear cutting machining method - Google Patents
Micro-channel linear cutting machining method Download PDFInfo
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- CN107570821B CN107570821B CN201710997962.2A CN201710997962A CN107570821B CN 107570821 B CN107570821 B CN 107570821B CN 201710997962 A CN201710997962 A CN 201710997962A CN 107570821 B CN107570821 B CN 107570821B
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Abstract
A microchannel linear cutting processing method is characterized in that a microchannel raw material is clamped on a linear cutting processing platform, and a processing track is set; and a pulse controller is arranged through an upper computer, and the mode and parameters of the pulse controller are determined according to the ripple characteristic dimension required by the machined surface. Cutting according to a set processing track, wherein the feeding of the wire electrode is controlled by an original machine tool servo system; in the machining process, the pulse controller controls the programmable pulse power supply in real time through the serial port, and the output waveform of the pulse power supply is changed regularly according to the parameters set by the upper computer, so that the surface of the cut workpiece is in a periodic waveform shape. The wire cutting machining efficiency is high, the cost is low, the machining process is flexible, and the wire cutting machining method is widely applied to machining of micro-channels. By changing the electrical parameters of the wire cut electrical discharge machining pulse power supply on line, the discharge energy in the machining process is changed, periodic ripples are generated on the surface of a cut workpiece, the specific surface area of a micro-channel is increased, and the hydrogen production performance of the reactor is improved.
Description
Technical Field
The invention relates to microchannel processing, in particular to a microchannel linear cutting processing method.
Background
In recent years, with the development of high and new technologies such as aerospace technology, information and electronic technology, MEMS (micro-electro-mechanical system) technology, biotechnology and life science, outstanding features such as miniaturization and compactness of spatial scale, and complexity of structure and conditions are presented, so that the effect micro-scale flow and heat transfer, which are necessary to consider in the medium transfer process, becomes one of the theoretical and technical bases of modern high and new technologies. With the progress of research, the technology of micro-scale heat transfer, microchannel reactor and the like is gradually expanded from the high and new technology field to the traditional industrial field.
The microchannel radiator has the characteristics of high heat transfer coefficient, low pressure drop, low power and the like, and is used as a novel radiating structure in various occasions such as aerospace, heating ventilation air conditioners, micro nuclear reactors and the like. Many scholars at home and abroad carry out a great deal of research on the Chinese herbal medicine. In the document "progress on phase change heat transfer microchannel technology" (DOI:10.3901/jme.2010.24.101), the authors wang, touyong, and yun jian have discussed the thermal fluid dynamics process and heat transfer mechanism in the microchannel, the influence relationship between the microchannel structure and the heat transfer characteristics, the manufacturing technology of the microchannel structure, and the like. The zhou yan, xu dong in the paper "development of heat exchange technology from large to small" (article number: 1001 and 2060(2005)05-0447-08) mentions that microchannels make the surface area per unit volume of fluid in contact with the channel much larger than that in conventional channels, so that the volume of the whole heat exchanger can be more than an order of magnitude smaller than that of the conventional heat exchanger. Therefore, if the specific surface area of the microchannel can be increased, the heat dissipation efficiency can be greatly improved. Microchannels are also commonly used in microreactors, and microchannel structure and surface quality affect the rate of catalytic reaction and catalytic conversion in the reactor.
In the document (research on the novel processing technology of long and straight microchannels of microchannel radiators, article number: 1007-2853(2011)09-0061-04, author Yang Kajun, Zuochun tamarisk, etc.), the microchannels are processed by wire cut electrical discharge machining, and processing parameters such as wire electrode compensation, pulse width, interpulse, etc. in the processing process are researched, so that a good processing effect is obtained. However, the micro-channel processed by wire cutting has a smooth surface and a low specific surface area.
The micro-channel is usually processed by processing methods such as precision milling, laser, chemical etching and the like, and the micro-channel surface microstructures manufactured by different processing methods are different, and the surface structures can influence the adhesion performance of a catalyst and the flow performance of a medium in the micro-channel and have great influence on the efficiency of a radiator and a reactor.
Disclosure of Invention
The invention aims to provide a micro-channel wire-electrode cutting machining method which utilizes a programmable pulse power supply to change electric parameters such as current, pulse frequency and the like on line in real time on the basis of wire-electrode cutting machining so as to machine micro-channels with periodic waveform profiles, aiming at the problems existing in the existing micro-channel machining.
The invention comprises the following steps:
1) clamping a microchannel raw material on an online cutting machining platform, and setting a machining track;
2) and a pulse controller is arranged through an upper computer, and the mode and parameters of the pulse controller are determined according to the ripple characteristic dimension required by the machined surface.
In step 2), the control mode of the pulse controller includes at least one of individual pulse current control, individual adjustment of the frequency of the pulse power supply, and the like; parameters of the pulse controller comprise control period, output waveform and the like, and the required ripple characteristic dimension of the processing surface can be wavelength, amplitude and the like.
3) Cutting according to a set processing track, wherein the feeding of the wire electrode is controlled by an original machine tool servo system;
4) in the machining process, the pulse controller controls the programmable pulse power supply in real time through the serial port, and the output waveform of the pulse power supply is changed regularly according to the parameters set by the upper computer, so that the surface of the cut workpiece is in a periodic waveform shape;
5) and finishing the processing.
The wire cut electrical discharge machining of the invention has the advantages of high machining speed, high production efficiency and the like, but the specific surface area of the machined micro-channel is low. The method for adjusting the pulse parameters and the current by the programmable control pulse power supply can process the micro-channel with the corrugated surface under the condition of not changing the processing track, has no influence on the operation of the processing, has no change on the requirements of a machine tool control system, and does not reduce the production efficiency. However, because the processing energy is changed regularly all the time, the processed contour is wavy, the specific surface area is greatly increased, and the performance of the micro-channel can be improved.
The wire cut electrical discharge machining uses a moving thin metal wire (brass wire or molybdenum wire) as an electrode to perform pulse spark discharge on a workpiece, and uses a numerical control technology to enable the electrode wire to perform relative transverse cutting motion on the workpiece. The wire cutting machining has the characteristics of high machining efficiency, low cost, flexible machining process and the like, and is widely applied to machining of micro-channels. The invention changes the discharge energy in the processing process by changing the electrical parameters of the wire cut electrical discharge machining pulse power supply on line, so that the surface of a cutting workpiece generates periodic ripples, thereby increasing the specific surface area of a micro-channel and improving the hydrogen production performance of a reactor.
Drawings
Fig. 1 is a schematic structural diagram of a pulse power supply according to an embodiment of the invention.
Fig. 2 is a cross-sectional view of wire electric discharge machining. In FIG. 2, a is the conventional wire-cut electrical discharge machining, and b is the electrical discharge machining of the transformation parameters
Fig. 3 is a schematic view of variable current processing. In fig. 3, the small dots indicate that there are multiple pulses of the same amplitude.
Fig. 4 is a schematic diagram of a wire electrode wire traveling track.
FIG. 5 is a schematic view of the profile of the micro-channel being fabricated.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.
The invention is mainly used for processing the micro-channel, and the micro-channel with the cross section shapes of rectangle, triangle, circle, trapezoid and the like is processed on the metal plate by adopting a wire electrical discharge machining method. As shown in figure 1, the wire cutting machine adopts a programmable pulse power supply to carry out wire cutting machining, and a machining path is determined by programming of an upper computer 1 according to the cross section shape. In the machining process, the programmable pulse power supply 2 is controlled on line in real time by adopting the pulse controller 3, and the discharge energy in the machining process is adjusted by changing electrical parameters such as pulse width, pulse interval, current and the like. As shown in the formula (1), since the magnitude of the discharge energy affects the machining gap, when the electrical parameters such as current, pulse width, pulse frequency, etc. are changed in the machining process of the wire-cut electrical discharge machine 4, the magnitude of the discharge gap is affected (usually, the variation is within the range of 5-20 μm), and the kerf width is also changed accordingly (as shown in fig. 2). In order to enable the micro-channel processed by the wire cutting to have larger specific surface area, the invention carries out online programming control on the wire cutting pulse power supply, so that the kerf width of the wire cutting process is periodically changed in the cutting process, and the surface of the processed micro-channel generates periodic corrugated shape. In fig. 2, V denotes a workpiece machining direction, P denotes a wire electrode, and M denotes a workpiece.
In the formula: s-spark discharge gap (meaning lateral single-sided discharge gap, um);
Ku-a constant related to the dielectric strength of the working fluid;
KRconstants, which are associated with the work material, are generally higher for fusible metals;
WM-a single pulse energy (J);
Smmechanical clearance to account for thermal expansion, contraction, vibration, etc., is about 3 um.
The invention adopts a pulse controller to carry out real-time control on a programmable pulse power supply, and the control modes comprise 3 types: the 1 st type is single pulse current control, as shown in fig. 3, other parameters are unchanged in the processing process, and pulse discharge energy is adjusted by controlling the output current of a programmable pulse power supply; 2, independently adjusting the frequency of a pulse power supply, keeping parameters such as current and the like unchanged in the processing process, changing the pulse width and pulse interval of pulses through the frequency, and changing the pulse number in unit time; the 3 rd method is a combination of the above two methods, i.e., the current and the pulse are changed together, thereby changing the single discharge energy and the number of pulses per unit time.
In the embodiment, the catalyst carrier plate in the micro-channel reactor for hydrogen production by methanol reforming is mainly used for processing.
The specific implementation steps are as follows:
1) the catalyst carrier plate is clamped on the online cutting and processing platform, the wire electrode wire moving track A is set according to the graph shown in figure 4, and the feeding speed is set. In FIG. 4, the symbol B denotes the bottom surface of the microchannel.
In the step, the wire electrode wire moving track and the feeding speed are set in the original machine tool, and a servo system is not changed.
2) A pulse controller is arranged by an upper computer, a pulse current control method is selected, and the current periodically changes according to the graph 3.
The current in the step is selected according to the contour requirement of the machined surface, and the change of the current is realized by an upper computer through a serial port real-time control pulse controller.
3) The machining is started and finished according to the setting.
The outline of the micro-channel is schematically shown in fig. 5, and in fig. 5, the mark C is the micro-channel.
Claims (1)
1. A micro-channel wire cutting machining method is characterized by comprising the following steps:
1) clamping a microchannel raw material on an online cutting machining platform, and setting a machining track;
2) setting a pulse controller through an upper computer, wherein the control mode and parameters of the pulse controller are determined according to the ripple characteristic dimension required by the machined surface; the control mode of the pulse controller comprises at least one of controlling the pulse current alone and adjusting the frequency of the pulse power supply alone; parameters of the pulse controller include a control period and an output waveform; the required ripple characteristic dimension of the machined surface is wavelength and amplitude;
3) cutting according to a set processing track, wherein the feeding of the wire electrode is controlled by an original machine tool servo system;
4) in the machining process, the pulse controller controls the programmable pulse power supply in real time through the serial port, and the output waveform of the pulse power supply is changed regularly according to the parameters set by the upper computer, so that the surface of the cut workpiece is in a periodic waveform shape;
5) and finishing the processing.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519292A (en) * | 2011-12-28 | 2012-06-27 | 华南理工大学 | Microchannel heat exchange plate with V-shaped fractal structures and preparation method of microchannel heat exchange plate |
| CN105880956A (en) * | 2016-06-16 | 2016-08-24 | 厦门大学 | Microchannel heat exchanger with porous bottom face of micro-pore structures and manufacturing method of microchannel heat exchanger |
| CN107153731A (en) * | 2017-05-02 | 2017-09-12 | 上海理工大学 | Magnetic field aids in low-speed WEDM machined surface roughness Forecasting Methodology |
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| JP5381384B2 (en) * | 2009-06-19 | 2014-01-08 | 日産自動車株式会社 | Thermal spraying pretreatment shape, thermal spraying pretreatment method, and thermal spraying pretreatment apparatus |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519292A (en) * | 2011-12-28 | 2012-06-27 | 华南理工大学 | Microchannel heat exchange plate with V-shaped fractal structures and preparation method of microchannel heat exchange plate |
| CN105880956A (en) * | 2016-06-16 | 2016-08-24 | 厦门大学 | Microchannel heat exchanger with porous bottom face of micro-pore structures and manufacturing method of microchannel heat exchanger |
| CN107153731A (en) * | 2017-05-02 | 2017-09-12 | 上海理工大学 | Magnetic field aids in low-speed WEDM machined surface roughness Forecasting Methodology |
Non-Patent Citations (1)
| Title |
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| 微通道散热器长直微通道的新加工工艺研究;杨凯钧等;《吉林化工学院学报》;20110930;第28卷(第9期);第61-64页 * |
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