CN103022517A - Matching type forming method and device of fuel battery metal flow field plate - Google Patents
Matching type forming method and device of fuel battery metal flow field plate Download PDFInfo
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Abstract
The invention relates to the field of micro fuel batteries, specially relates to matching type forming method and device of a fuel battery metal flow field plate, and in particular is suitable for micro-forming suitable for a superthin metal flow field plate with a complicate structure. The matching type forming method comprises the following steps that: according to the structure and the cross-section shape of a flowing passage of a predesigned micro metal flow field plate, an upper die head is designed as a convex die, a lower die head is designed as a concave die, center lines of the two die heads are coincided, the upper die head and the lower die head are opposite, matched and compatible, the lower die head is fixed, and the upper die head can longitudinally move. Moving paths of an upper forming die head and an lower forming die head are planned according to the flowing direction of the flowing passage, and the motions of an X-axial platform and a Y-axial platform are controlled through a control system, so that the motions of the upper forming die head and the lower forming die head are achieved, and the forming of a whole flow field is finished. The forming device comprises a base, an X-axial platform, a Y-axial platform, a blank-pressing device, a control system and a forming system. By utilizing the matching type forming method, the forming of any micro metal flow field plate with the complicate shape can be achieved, and the matching type forming method is beneficial to promoting the application of the micro metal flow field plate in micro fuel batteries.
Description
Technical field
The present invention relates to micro fuel cell technical field and little manufacture field, specifically a kind of fuel battery metal flow-field plate formula manufacturing process and device, it is applicable to the subtend Quick-forming of super thin metal flow-field plate runner, and working (machining) efficiency height and Product Precision are high.
Background of invention
The modern industry energy demand is significantly risen, and the harmful substance that discharges when fossil-fuel-fired is causing the continuous deterioration of biological environment, and the development of green energy resource is very urgent.Fuel cell be a kind of isothermal and directly will be stored in chemical energy in fuel and the oxidant efficient, be converted into the Blast Furnace Top Gas Recovery Turbine Unit (TRT) of electric energy to environmental friendliness.Proton Exchange Membrane Fuel Cells (PEMFC) can start fast in room temperature, without electrolyte loss, water easily discharge, the life-span is long, specific power and specific energy height, have broad application prospects.
The formation of PEMFC comprises anode and cathode collector plate (flow-field plate), gas diffusion layers, Catalytic Layer and proton exchange membrane etc.Bipolar plates is one of critical component of PEMFC, and its quality accounts for 70% of pile gross mass, and cost accounts for more than 60%.Composite graphite plate, flexible graphite and sheet metal plate all are very potential bipolar plate materials, and the sheet metal bipolar plates not only is easy to realize batch production, reduce the pile cost, and can increase substantially the pile specific power, and be the most competitive plate material.Metal double polar plates generally should have following characteristics: corrosion resistance is eager to excel (＜1 μ A/cm2), to guarantee the life-span (being generally several thousand to several ten thousand hours) of battery pack; Preferably select the processing technology that is suitable for producing in batches with reduce the battery pack cost (6 dollars/kW); Thin (the t≤0.2mm) of thickness; That quality is wanted is light (m≤1kg/kW); It is high that dimensional accuracy is wanted.At present, pay much attention to metal double polar plates precision form manufacture method and corrosion resistance research both at home and abroad.
But simultaneously, because the characteristic size of runner is generally at 50～500 μ m, the microminiaturization of the characteristic size of metal flow field plate and high-precision requirement have proposed challenge to its shaping, mechanical property at (size is in the submillimeter magnitude on both direction at least) material under minute yardstick can show the characteristics different from traditional yardstick, namely scale effect with forming process.Especially the flow-field plate in the micro PEMFC bear high temperature, deep-etching, many couplings and pressure alternation complicated Service Environment, base material the selection of material, flow field patterns, forming technology and precision etc. are all proposed requirements at the higher level, increased the shaping difficulty of miniature flow-field plate.
Few in number through patent and the technology report of retrieving domestic and international correlation technique document discovery micro PEMFC flow-field plate forming process.Shuo-Jen Lee (Journal of Power Sources.2005,145:369～375) proposes to utilize be shaped microscopic feature on the stainless steel SS304 metal flow field plate of electroforming process; Yu-Ming Lee (Journal of Power Sources.2009,193 (1): 227～232) studied the shaping of employing electrochemical micro process to the Proton Exchange Membrane Fuel Cells metal flow field plate; Masanori Yokoyama (International Journal of Hydrogen Energy.2008,20 (33): 5678～5685.) studied the hot press forming method of metal glass bipolar plates.American I an W.Kaye applies for a patent: High surface area micro fuelcell architecture (micro fuel cell structure with high surface), publication number is US20050255368A1, and the fluid channel processing of mentioning micro fuel cell in the patent is to adopt Wafer Machining to realize." a kind of impacted metal double polar plate structure and preparation method thereof " that Chinese patent 1787261A proposes is to utilize milling machine to process runner, drawing metal double polar plates then, and the runner processing inefficiency is not suitable for the processing of fluid channel.Cathode flow field plate and the manufacture method of the self-breathing micro-proton exchange film fuel cell of Chinese patent CN1933221 application are to utilize microelectromechanical systems (MEMS) technology to process flow-field plate at silicon chip.The Liu Chong of Dalian University of Technology applies for a patent: a kind of manufacture craft for preparing metallic flow field plate of micro fuel cell, publication number is CN101222057, be to process fine structure by photoetching and method for chemially etching in the metal surface, have the flow-field plate of various shape runners thereby form.
Rolling formation, hydraulic expanding-forming and Pressure Welding that the forming technology that research and the patent about the fuel battery metal flow-field plate of reporting at present adopts mainly contains in the plastic forming process are shaped, also have other based on the method for micro-nano device processing, comprise that chemical etching is shaped, the liquid forming technology.But along with the microminiaturization of miniature flow-field plate upper runner, difficulty of processing and the cost of miniature punch and die sharply rise, and working (machining) efficiency is low, are not suitable for the low-cost of miniflow field plate and make in batches.
Summary of the invention:
The object of the invention is to overcome the deficiencies in the prior art, a kind of manufacturing process and device of fuel battery metal flow-field plate are provided, take the super thin metal plate as base material, utilize two in opposite directions the shaping dies corresponding with the flow-field plate flow channel shape that metal blank is pressed down and supports, then keep this position and move according to the trend of flow-field plate runner, realize the shaping in whole flow field, forming process comprises the effect of punching press, extruding and support.The present invention is specially adapted to the metal flow field plate shaping that conventional micro-processing method is difficult to be shaped and has the labyrinth form under the minute yardstick, need not punch and die, processing is simple, be easy to batch production, the flow-field plate manufacturing expense can significantly reduce, and helps applying of fuel battery metal flow-field plate and micro PEMFC.
The technical solution used in the present invention:
The present invention is achieved through the following technical solutions, the present invention is at first according to the metal flow field plate cross section of fluid channel shape that designs in advance, design is also processed upper shaping die as the forming tool of metal flow field plate upper runner, and then designs and process lower shaping die as the supporting tool of metal flow field plate upper runner.The shape of shaping die working portion is corresponding with the cross section of fluid channel shape up and down, and it is semicircle then going up shaping die for the half round runner cross section, and lower shaping die indent is semicircle; It is trapezoidal that trapezoidal cross section of fluid channel is then gone up shaping die, and lower shaping die indent is trapezoidal; It is triangle that the triangle cross section of fluid channel is then gone up shaping die, and lower shaping die indent is triangle; In order to improve the resistance to wear of shaping die, need to carry out intensive treatment to the shaping die working portion in addition.The base material peripheral regions realizes the fixing and flanging of base material by flange fixing installation, then according to flow channel shape with move towards original position and the motion path of shaping die about the planning, up and down after the original position of shaping die by the control arrival flow-field plate of control system, degree of depth upper die head according to runner presses down the ultra-thin plate of base material, and lower die head is played a supporting role.Then the position that keeps two shaping dies controls up and down the shaping die direction of motion, path and process velocity according to the trend of flow-field plate runner by trend and the translational speed of control X axis platform, Y-axis platform by control system; Little shaping die by the accumulation of tiny area Plastic Forming, is finished the shaping in whole flow field along flow-field plate runner trend, finally obtains the micro metal flow-field plate of desired structure form, and forming process has comprised the effect of punching press and extruding and support.
Described metal flow field plate substrate can be selected stainless steel, titanium alloy, the various metal materials such as aluminium alloy and various modified metal material, the flow-field plate base material thickness is in 40～1200 mu m ranges, according to different flow-field plate base materials, can control the forming process of metal flow field plate by the optimizing machining technology parameter, selectable parameter comprises the shaping die volume under pressure, shaping die motion path (X axis platform, Y-axis platform movement path), shaping die process velocity (X axis platform, Y-axis platform movement speed), the pressure-pad-force size, the number of shaping die, structure, the parameter such as physical dimension and shape.
The present invention can arrange many to shaping die simultaneously, under the control of control system to the shaping die motion path, can realize simultaneously the processing of the metal flow field plate of a plurality of same stream field structures.
Building mortion of the invention process comprises base, X axis platform, Y-axis platform, flange fixing installation, control system and formation system.Wherein X axis platform, Y-axis platform can be realized the adjustment of Working position.Upper die head is for can vertically move die head, and by upper formation system control, lower die head is fixed.Successively by accurate digital control device, piezoelectric ceramic upper padding plate, piezoelectric ceramic, piezoelectric ceramic lower bolster, pressure sensor, displacement transducer upper padding plate, displacement transducer, fixedly backing plate, shaping die form, wherein piezoelectric ceramic can realize accurately that little shaping die is in the volume under pressure of original position to upper formation system from top to bottom.Flange fixing installation is comprised of bolt, spring, pressing plate, screwed hole, supporting seat and attachment screw, wherein supporting seat is installed in adjustable location with realizing connecting and fixing above the workbench and with screw, base material is placed on the supporting seat, pressing plate is placed on the base material, bolt sleeve has spring, is fixed on the supporting seat by screwed hole.Control system is by computer, D/A converter, control unit, piezoelectric ceramic actuator and A/D converter form, the control system that wherein is connected with formation system is by computer, D/A converter, control unit, piezoelectric ceramic actuator and A/D converter form, wherein control unit one end links to each other with piezoelectric ceramic actuator with the accurate digital control device, the other end links to each other with computer by D/A converter, A/D converter one end links to each other with computer, an other end links to each other with displacement transducer with pressure sensor respectively, and control system realization original position is found accurately, upper shaping die loads, volume under pressure, machining locus, the control of the accurate loading of piezoelectric ceramic and backhaul.The control system that wherein is connected with X axis platform, Y-axis platform is comprised of computer, D/A converter, control unit, and wherein control unit one end is connecting X axis platform, Y-axis platform, and an end links to each other with computer by D/A converter.Advantage of the present invention:
Since this device be equipped with up and down amount relatively to and the concavo-convex die head that matches of die head shape, when the processing fuel-cell metal flow field plate, can directly process base material with upper die head, and lower die head is played a supporting role, until be shaped.Also can well guarantee forming efficiency and precision in the machining period that has reduced dimpling mould and nick mould and expense, technique is simple and easy to control.
Since the course of processing of flow-field plate be up and down two die heads carry out synchronously and the die head direction of motion identical with process velocity, and lower die head can play a supporting role, and improved forming accuracy and quality.
3. in shaping die convection current field plate forming process, shaping die is shaped by local plastic deformation, when shaping die moves, the material of its neighboring area is had a local squeezing action, can play the material reinforcement effect.
4. because upper shaping die can be placed on the accurate digital control device, so the volume under pressure of upper die head can accurately be guaranteed, and the parameter such as shaping die motion path (X axis platform, Y-axis platform movement path), shaping die process velocity (X axis platform, Y-axis platform movement speed) also can be passed through the control system accuracy controlling, so can guarantee the sustainability and the repeatability that are shaped, easily realize automated production.
5. by arranging a plurality of shaping dies, can realize single clamping shaping polylith flow-field plate.
6. by changing the shape of shaping die, can process the flow-field plate of various different cross section shapes, strong adaptability.
Description of drawings:
Fig. 1 is the formula building mortion sketch of fuel battery metal flow-field plate.
Fig. 2 is the formula building mortion left view of fuel battery metal flow-field plate.
Fig. 3 is the partial enlarged drawing in the die head practical work process up and down.
Fig. 4 is straight channel flow-field plate schematic diagram.
Fig. 5 is serpentine flow path flow-field plate schematic diagram.
Fig. 6 is the flow-field plate schematic diagram with point-like flow field structure.
Fig. 7 is the interdigitated flow field schematic diagram.
Fig. 8 is up and down shaping die and the fluid channel schematic diagram with semicircular in shape.
Fig. 9 is up and down shaping die and the fluid channel schematic diagram with trapezoidal shape.
Figure 10 has triangular shaped up and down shaping die and fluid channel schematic diagram.
1 accurate digital control device, the 2A/D converter, the 3D/A converter, 4 control modules, 5 piezoelectric ceramic actuators, 6 computers, 7 bolts, 8 springs, 9 pressing plates, 10 screwed holes, the 11Y axial platform, the 12X axial platform, 13 supporting seats, attachment screw between 14 supporting seats and base, 15 bases, 16 guide rails, the attachment screw of 17 fixed blocks and Y-axis platform, 18 fixed blocks, 19 times shaping dies, 19a has the lower shaping die that indent is semicircular in shape, 19b has the lower shaping die that indent is trapezoidal shape, it is triangular shaped lower shaping die that 19c has indent, 20 base materials, shaping die on 21, 21a has the upper shaping die of semicircular in shape, 21b has the upper shaping die of trapezoidal shape, 21c has triangular shaped upper shaping die, 22 fixing backing plates, 23 displacement transducers, 24 displacement transducer upper padding plates, 25 pressure sensors, 26 piezoelectric ceramics lower bolsters, 27 piezoelectric ceramics, 28 piezoelectric ceramics upper padding plates, 29 columns, 30 crossbeams, 31 rivets, 32 flow-field plate, the gas access of 33a straight channel flow-field plate, the gas access of 33b serpentine flow path flow-field plate, 33c has the gas access of the flow-field plate of point-like flow field structure, the gas access of 34d interdigitated flow field, 35 brace summers, 36 runners, the gas vent of 37a straight channel flow-field plate, the gas vent of 37b serpentine flow path flow-field plate, 37c has the gas vent of the flow-field plate of point-like flow field structure, the gas vent of 37d interdigitated flow field, the deformation state of material when Shang Xia 38, die head is worked
Embodiment:
Describe device detail and the working condition that the present invention proposes in detail below in conjunction with Fig. 1.
In conjunction with Fig. 1, the building mortion of whole fuel battery metal flow-field plate comprises base, X axis platform, Y-axis platform, flange fixing installation, control system and formation system.Workbench is used for settling formation system and flange fixing installation, formation system is finished the shaping of flow-field plate by the mobile motion that drives shaping die of X axis platform, Y-axis platform, flange fixing installation is used for fixing substrate, and play the effect of regulating pressure-pad-force, the movement of shaping die action and X axis platform, Y-axis platform in the control system control.
Successively by accurate digital control device, piezoelectric ceramic upper padding plate, piezoelectric ceramic, piezoelectric ceramic lower bolster, pressure sensor, displacement transducer upper padding plate, displacement transducer, fixedly backing plate and upper shaping die, wherein piezoelectric ceramic can realize accurately that shaping die is in the volume under pressure of original position to upper formation system from top to bottom.Lower formation system is followed successively by fixedly wooden unit and lower die head from the bottom to top, wherein fixedly connect with screw between wooden unit and the Y-axis platform, lower die head with fixedly between the wooden unit with being threaded.Flange fixing installation is comprised of bolt, spring, pressing plate, screwed hole, supporting seat and attachment screw, wherein base material is placed on the supporting seat, pressing plate is placed on the base material, had the bolt of spring to be fixed on the supporting seat by screwed hole by cover, the effect of flanging fixed base material and realize by spring by pressing plate.Control system and formation system and X axis platform, the Y-axis platform is connected, the control system that wherein is connected with formation system is by computer, D/A converter, control unit, piezoelectric ceramic actuator and A/D converter form, wherein control unit one end links to each other with piezoelectric ceramic actuator with the accurate digital control device, the other end links to each other with computer by D/A converter, A/D converter one end links to each other with computer, an other end links to each other with displacement transducer with pressure sensor respectively, and control system realization original position is found accurately, upper shaping die loads, volume under pressure, machining locus, the control of the accurate loading of piezoelectric ceramic and backhaul.The control system that wherein is connected with X axis platform, Y-axis platform is comprised of computer, D/A converter, control unit, and wherein control unit one end is connecting X axis platform, Y-axis platform, and an end links to each other with computer by D/A converter.
As shown in Figure 2, be the left view of Fig. 1,29 expression columns, 30 expression crossbeams, 31 is rivet.
As shown in Figure 3, the partial enlarged drawing during for the device rapidoprint of Fig. 1, the deformation state when 38 expression materials are processed.
Be illustrated in figure 4 as straight channel flow-field plate schematic diagram, in straight channel flow-field plate 32, reacting gas is entered by the gas access 33a of straight channel flow-field plate, gas reacts with other other via straight channel 36, gas vent 37a by the straight channel flow-field plate discharges at last, the brace summer of straight channel flow-field plate is played a supporting role, and improves the intensity of runner plate, and shaping die can finally be realized the shaping of straight channel flow-field plate according to little shaping die movement locus of shaping straight channel up and down.
Be illustrated in figure 5 as serpentine flow path flow-field plate schematic diagram, in serpentine flow path flow-field plate 32, reacting gas is entered by the gas access 33b of serpentine flow path flow-field plate, gas reacts with other other via serpentine flow path 36, gas vent 37b by the serpentine flow path flow-field plate discharges at last, the brace summer of serpentine flow path flow-field plate is played a supporting role, improve the intensity of runner plate, shaping die can finally be realized the shaping of serpentine flow path flow-field plate according to little shaping die movement locus of shaping serpentine flow path up and down.
Be illustrated in figure 6 as the flow-field plate schematic diagram with point-like flow field structure, in the flow-field plate 32 with point-like flow field structure, reacting gas is entered by the gas access 33c of the flow-field plate with point-like flow field structure, gas reacts with other other via the runner 36 with point-like flow field, gas vent 37c by the flow-field plate with point-like flow field structure discharges at last, brace summer with flow-field plate of point-like flow field structure is played a supporting role, improve the intensity of runner plate, shaping die little shaping die movement locus of having the runner in point-like flow field according to shaping can finally realize having the shaping of the flow-field plate of point-like flow field structure up and down.
Be illustrated in figure 7 as the interdigitated flow field schematic diagram, in interdigitated flow field 32, reacting gas is entered by the gas access 33d of interdigitated flow field, gas reacts with other other via interdigitated runner 36, gas vent 37d by interdigitated flow field discharges at last, the brace summer of interdigitated flow field is played a supporting role, and improves the intensity of runner plate, and shaping die can finally be realized the shaping of interdigitated flow field flow-field plate according to little shaping die movement locus of shaping interdigitated runner up and down.
As shown in Figure 8, cross section of fluid channel is semicircle, and corresponding a pair of shaping die also has identical semicircular in shape feature.
As shown in Figure 9, cross section of fluid channel is trapezoidal, and corresponding a pair of shaping die also has identical trapezoidal shape feature.
As shown in figure 10, cross section of fluid channel is triangle, and corresponding a pair of shaping die also has identical triangular shaped feature.The embodiment of this device is described as an example of the serpentine flow field plate example:
In conjunction with Fig. 1, Fig. 2, Fig. 5, Fig. 8, the manufacturing process of the snakelike metal flow field plate of fuel cell is as follows:
Its manufacturing process is upper shaping die (punch) 21 and the lower shaping die (die) 19 that semicircular sectional shape, size and the accuracy Design processing of the serpentine flow path that is shaped as required has semicircular in shape, it is the stainless steel of 100 μ m that base material 20 is selected thickness, and overall dimension is the rectangular slab of 1.2cm * 1.2cm.At base 15 the X axis guide rail is installed first, be provided with the X axis platform 12 that can move on the X axis guide rail thereon, be provided with the Y-axis guide rail at the X axis platform, be provided with the Y-axis platform 11 that can move thereon at the Y-axis guide rail, column 29 is equipped with on the left side of Y-axis platform 11, crossbeam 30 is equipped with at column 29 tops, and crossbeam 30 embeds column 29 tops, adopts riveted joint 31 to connect column 29 and crossbeam 30; Crossbeam 30 other ends are installed building mortion, upper shaping die is installed in fixedly in the backing plate 22, then from bottom to top successively connection bit displacement sensor 23, displacement transducer upper padding plate 24, pressure sensor 25, piezoelectric ceramic lower bolster 26, piezoelectric ceramic 27, piezoelectric ceramic upper padding plate 28 are connected with accurate digital control device 1 at last; The control system that is connected with upper formation system is comprised of computer 6, D/A converter 3, control unit 4, piezoelectric ceramic actuator 5 and A/D converter 2, control unit 4 one ends are linked to each other with piezoelectric ceramic actuator 5 with accurate digital control device 1, the other end links to each other with computer 6 by D/A converter 3, A/D converter 2 one ends link to each other with computer 6, and an other end links to each other with displacement transducer 23 with pressure sensor 25 respectively.Then lower building mortion is installed, fixed block 18 is installed in Y-axis platform 11 the right, connect with screw 17, screwed lower die head 19 is embedded in the fixed block 18, realize the fixing of lower die head 19, two die head center lines are adjusted by CCD and are reached coincidence.The control system that is connected with X axis platform 12, Y-axis platform 11 is installed, this system is comprised of computer 6, D/A converter 3, control unit 4, wherein control unit 4 one ends are connecting X axis platform 12, Y-axis platform 11, one ends link to each other with computer 6 by D/A converter 3.Supporting seat 13 is placed on the base 15, utilize attachment screw 14 that supporting seat 13 is fixed on the base 15, base material 20 is placed on the supporting seat 13, spring 8 is enclosed within on the bolt 7, bolt 7 is fixed on the supporting seat 13 by screwed hole 10, spring 8 is fixed base material 20 by pressing plate 9, and plays the effect of flanging, and the adjustment of pressure-pad-force can be regulated by bolt 7.Select and optimize good forming parameters (upper shaping die 21 volumes under pressure, X axis platform 12 and Y-axis platform 11 mobile routes, X axis platform 12 and Y-axis platform 11 translational speeds, pressure-pad-force size etc.), thereby the while has been planned the good up and down original position of shaping die work of transport coefficient planning of X axis platform 12 and Y-axis platform 11 according to the trend of runner 36.The lengthwise movement track of the transport coefficient of X axis platform 12 and Y-axis platform 11 and upper shaping die adopts programming software to produce code input computer 6; Computer 6 is by D/A converter 3 and control unit 4 control X axis platforms 12, the motion of Y-axis platform 11 and accurate digital control device 1, so that shaping die arrives the above and below of the original position of flow-field plate up and down, upper shaping die 21 degree of depth according to runner under the control of D/A converter 3 and control unit 4 is carried out vertical depression to base material 20, pressure sensor 25 and displacement transducer 23 are directly inputted signal computer 6 by A/D converter 2, compare at any time, for the high runner of requirement on machining accuracy, after being depressed into to a certain degree, can utilize D/A converter 3, control unit 4 and piezoelectric ceramic actuator 5 accurate control piezoelectric ceramic 27, realize the up and down minimum volume under pressure of shaping die, precision can reach 0.1 μ m; Keep the up and down position of shaping die this moment, X axis platform 12, Y-axis platform 11 drive the up and down local plastic shaping of shaping die on base material 20, by the accumulation of tiny area Plastic Forming according to the code motion of having finished, finish the shaping of whole runner 36, finally obtain flow-field plate.When shaping die arrived the final position up and down, computer 6 sent the motion that instruction stops X axis platform 12 and Y-axis platform 11 and accurate digital control device 1, drove X axis platform 12 and Y- axis platform 11 and 1 backhaul of accurate digital control device; Adopt special flow-field plate gathering-device to take off flow-field plate, to guarantee the precision of miniature flow-field plate.
When shaping die was changed trapezoidal or triangle up and down, corresponding flow-field plate cross section of fluid channel shape was respectively trapezoidal and triangle, and execution mode is the same when being semicircle with die head.
Claims (4)
1. the formula building mortion of a fuel battery metal flow-field plate comprises base, X axis platform, Y-axis platform, flange fixing installation, control system and formation system.The base top is provided with the X axis guide rail, be provided with the X axis platform that can move on the described X axis guide rail thereon, be provided with the Y-axis guide rail at the X axis platform, be provided with the Y-axis platform that can move thereon at the Y-axis guide rail, on the Y-axis platform formation system is housed.Formation system comprises column, X axis spreader, accurate digital control device, upper shaping die and lower shaping die.Wherein on the left side of Y-axis platform column is housed, adopts screw to connect.The X axis spreader is equipped with at the column top, and the X axis spreader embeds the column top, adopts riveting column and X axis spreader; The X axis spreader other end is equipped with the accurate digital control device, and the accurate digital control device is from top to bottom successively by piezoelectric ceramic upper padding plate, piezoelectric ceramic, piezoelectric ceramic lower bolster, pressure sensor, displacement transducer upper padding plate, displacement transducer, fixedly backing plate, upper shaping die form.With respect to column, fixed block is equipped with on Y-axis platform the right, and fixed block is connected with screw with the Y-axis platform, and screwed lower die head is embedded in the fixed block, realizes the fixing of lower die head.This formation system is characterised in that upper die head is punch (the punch shape is determined by the flow-field plate flow channel shape), lower die head is die (die shape and concavity are determined by flow-field plate groove shape and the degree of depth), two die head central lines, die head in opposite directions and cooperate compatible up and down, lower die head is fixed, and upper die head can vertically move.Control system and formation system and X axis platform, the Y-axis platform is connected, the control system that wherein is connected with formation system is by computer, D/A converter, control unit, piezoelectric ceramic actuator and A/D converter form, wherein control unit one end links to each other with piezoelectric ceramic actuator with the accurate digital control device, the other end links to each other with computer by D/A converter, A/D converter one end links to each other with computer, an other end links to each other with displacement transducer with pressure sensor respectively, and control system realization original position is found accurately, upper shaping die loads, volume under pressure, machining locus, the control of the accurate loading of piezoelectric ceramic and backhaul.The control system that wherein is connected with X axis platform, Y-axis platform is comprised of computer, D/A converter, control unit, and wherein control unit one end is connecting X axis platform, Y-axis platform, and an end links to each other with computer by D/A converter.The right of base is provided with flange fixing installation, and flange fixing installation is comprised of bolt, spring, pressing plate, screwed hole, supporting seat and attachment screw.Wherein base material is placed on the supporting seat, and spring housing is on bolt, and bolt is fixed on the supporting seat by screwed hole, and spring is fixed base material and realize the effect of flanging by pressing plate, and attachment screw is realized being connected of supporting seat and base.This flange fixing installation is characterised in that the supporting seat height is identical with the lower die head height, and securing lower die head can directly contact with the base material lower surface during in order to assurance processing base material.The concrete technology step is as follows:
After base material fixed, the X axis platform was shifted in the supporting seat by guide rail, stopped after the original position of lower die head arrival flow-field plate, and this moment, lower die head directly contacted with the flow-field plate lower surface.Upper die head presses down according to flow channel depth by the control of accurate digital control device.Then shaping die position in the maintenance is moved according to the trend of flow-field plate runner by control system control X axis platform, Y-axis platform, and wherein moving direction and translational speed are all controlled by control system.Shaping die by the accumulation of tiny area Plastic Forming, is finished the shaping in whole flow field along flow-field plate runner trend up and down, and forming process comprises punching press and the effect of extruding and the supporting role of lower die head of upper die head, finally obtains metal flow field plate.It is characterized in that with the forming tool of upper shaping die as the metal flow field plate upper runner lower die head reaches the effect that guarantees metal flow field plate runner precision as support.
2. the formula building mortion of a kind of fuel battery metal flow-field plate according to claim 1, it is characterized in that version and cross section of fluid channel shape according to the fuel battery metal flow-field plate that designs in advance, the upper shaping die of design and processing, then according to the channel form of fuel battery metal flow-field plate runner of design in advance, design and processing lower die head, making up and down, die head can cooperate and compatibility in shape.
3. the manufacturing process of a kind of fuel battery metal flow-field plate according to claim 1, the shape that it is characterized in that described shaping die working portion is corresponding with the cross section of fluid channel shape, for the half round runner cross section, upper shaping die working portion be shaped as semicircle, it is circular that the concave shape of lower shaping die also should be mutually; For trapezoidal cross section of fluid channel, being shaped as of upper shaping die working portion is trapezoidal, and it is trapezoidal that the concave shape of lower shaping die also should be mutually; For the triangle cross section of fluid channel, upper shaping die working portion be shaped as triangle, the concave shape of lower shaping die also should be triangle mutually.In order to improve the resistance to wear of shaping die, the shaping die working portion is carried out intensive treatment; Select the corresponding upper initial lower pressure point of shaping die and machining locus according to different flow field structures, realize little shaping in parallel flow field, interdigitated flow field, snake type flow field; Described metal flow field plate substrate can be selected stainless steel, titanium alloy, the various metal materials such as aluminium alloy and various material modified, the flow-field plate base material thickness is in 40～1200 mu m ranges, according to different flow-field plate base materials, can control the forming process of metal flow field plate by the optimizing machining technology parameter, selectable parameter comprises the shaping die volume under pressure, shaping die motion path (X axis platform, Y-axis platform movement path), shaping die process velocity (X axis platform, Y-axis platform movement speed), the pressure-pad-force size, the number of shaping die, structure, the parameter such as physical dimension and shape.
4. the manufacturing process of a kind of fuel battery metal flow-field plate according to claim 1, it is characterized in that by arranging simultaneously many to shaping die, under the control of control system to little shaping die motion path, can realize simultaneously the processing of the metal flow field plate of a plurality of same stream field structures.
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| CN108832142A (en) * | 2018-06-26 | 2018-11-16 | 李荣旭 | A kind of processing unit (plant) of proton exchange membrane fuel cell metal flow-field plate |
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