WO2009096309A1 - Procédé de travail à la presse pour tôle métallique, matrice pour celui-ci, et produit formé - Google Patents

Procédé de travail à la presse pour tôle métallique, matrice pour celui-ci, et produit formé Download PDF

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Publication number
WO2009096309A1
WO2009096309A1 PCT/JP2009/050969 JP2009050969W WO2009096309A1 WO 2009096309 A1 WO2009096309 A1 WO 2009096309A1 JP 2009050969 W JP2009050969 W JP 2009050969W WO 2009096309 A1 WO2009096309 A1 WO 2009096309A1
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WO
WIPO (PCT)
Prior art keywords
blank
mold
pressing
sheet metal
press working
Prior art date
Application number
PCT/JP2009/050969
Other languages
English (en)
Japanese (ja)
Inventor
Haruo Okahara
Masayuki Yano
Nobuyuki Kajihara
Shingo Kino
Kenji Higashi
Original Assignee
Kasatani Corp.
Public University Corporation Osaka Prefecture University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kasatani Corp., Public University Corporation Osaka Prefecture University filed Critical Kasatani Corp.
Priority to JP2009551485A priority Critical patent/JPWO2009096309A1/ja
Publication of WO2009096309A1 publication Critical patent/WO2009096309A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0204—Non-porous and characterised by the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/02—Dies or mountings therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/12—Forming profiles on internal or external surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K23/00—Making other articles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Definitions

  • the present invention relates to a metal mold for sheet metal press working of a metal plate material, a press working method using the metal mold, and a molded product.
  • the molded product relates to a fuel cell separator.
  • Sheet metal pressing generally obtains a desired shape by bending or drawing a plate-shaped blank with a mold. Accordingly, the thickness of the blank is slight due to these deformations, and the molded product has a shape in which a concave portion is present on the surface opposite to the convex portion.
  • magnesium or a magnesium alloy has poor ductility, so that such general sheet metal press processing has been performed. That is, sheet metal pressing has not been applied to the manufacture of an article made of magnesium or a magnesium alloy in which concave and convex shapes that do not correspond to the concave portion are formed on the opposite surface of the convex portion on both surfaces of the plate material.
  • a separator for a fuel cell for partitioning a large number of units composed of a fuel electrode, an air electrode, a current collector layer, and the like and supplying a reaction gas. It has a shape with a groove.
  • fuel gas generally hydrogen
  • oxygen generally air
  • fuel gas and oxygen are supplied and discharged separately on the front and back sides.
  • the concave and convex portions are formed on the front and back surfaces of the separator on the surface opposite to the convex portion for the groove shape, the conventional sheet metal pressing has not been applied.
  • Patent Document 1 A processing method for obtaining such an uneven shape that does not correspond to front and back using magnesium or a magnesium alloy is described in Patent Document 1, for example.
  • This method is for preheating a magnesium alloy to forge a molded product with bosses and ribs.
  • An example of forging a molded product with a thickness of 0.6 to 3.2 mm using an ingot with a thickness of 10 mm is as follows. It is shown.
  • Patent Document 2 relates to the manufacture of a fuel cell separator.
  • an annealed magnesium alloy is used, and superplastic forging is slowly performed at a strain rate of 2 ⁇ 10 ⁇ 5 to 1 ⁇ 10 ⁇ 1 / sec using a heated mold. Processing to a 2 mm product is illustrated.
  • the present invention eliminates the disadvantages of the above-described prior art, and enables the production of a metal molded product having an uneven shape that does not correspond to the front and back surfaces in a short time, a pressing method, and a low manufacturing cost.
  • An object of the present invention is to provide a molded article having the above shape (specifically, a fuel cell separator).
  • the present invention is a sheet metal press working method of a metal sheet material, wherein a concave and convex shape composed of convex portions due to concentration of fluid material during pressing and concave portions due to discrete is formed on the front and back surfaces of the blank.
  • a mold having an upper mold and a lower mold whose contour of the pressing surface is determined the contact portion of the mold with the blank is heated to a temperature that increases the plastic deformability of the blank, and the convex
  • the present invention provides a sheet metal pressing method characterized by simultaneously forming unevenness having a shape that does not correspond to a concave portion on a surface opposite to a portion on both surfaces of the plate material.
  • uneven shapes having different shapes can be simultaneously formed on both surfaces of the plate blank by warm sheet metal pressing.
  • a plate-like material as a blank, it is possible to obtain a material flow that reaches the final shape even if the press speed is increased, and compared with warm forging that forms from a bulk material to a plate-like material, the press time is reduced. It can be greatly shortened.
  • the present invention is a mold used for warm sheet metal pressing of a metal plate material, and the upper mold and the lower mold do not have unevenness corresponding to each other vertically. And a heating portion for heating the pressing surface, the pressing surface forming an uneven shape including convex portions due to concentration of fluid material during pressing and concave portions due to discrete on the front and back surfaces of the blank. Further, the present invention provides a metal mold for sheet metal press working, characterized in that the contour is determined.
  • the upper mold and the lower mold have a pressing surface that does not have unevenness corresponding to each other vertically, and a heating portion for heating the pressing surface, and the pressing surface is Since the contours are determined so that the concave and convex shapes consisting of convex portions due to the concentration of the fluid material and the concave portions due to the discrete are formed on the front and back surfaces of the blank, both sides of the plate blank are different by warm sheet metal pressing Shape irregularities can be formed at the same time.
  • the upper mold and the lower mold each have a base that moves up and down during press working, a support fixed to the base, a base end fixed to the support, and a tip contacting the blank.
  • a slide portion that protrudes from the hole and accommodates the tip of the pressing member in the through hole at the forward position, and the slide portion receives a spring force toward the forward position. .
  • the contact surface to the blank at the time of pressing is composed of a pressing member fixed to a support that moves up and down together with the base and a slide portion that is supported by the base so as to move up and down, the initial to the blank Since the contact is performed at the slide portion and the pressing element is then projected, the impact on the pressing element and the load of the pressing pressure are reduced. As a result, the durability of the entire mold can be improved, and wear and damage of the mold can be prevented even when a precise press shape is obtained. Moreover, since the slide part is contacting the upper and lower sides of a blank, only the area
  • the pressing elements may be formed of a plate-like body and arranged in parallel with a minute interval in a state of facing each other.
  • a plurality of groove-shaped or bowl-shaped irregularities are press-formed, it is necessary to provide an elongated contour portion corresponding to these at the die tip, and if a high press pressure is applied thereto, the mold is likely to be worn.
  • the pressing element that advances and retreats from the above-described slide portion with the plate-like body as described above, the impact applied to the pressing element and the press pressure load are reduced, and the wear can be prevented.
  • the surface direction of the upper mold presser and the surface direction of the lower mold presser may be arranged so as to cross each other. According to this mold, it is possible to obtain groove-shaped or bowl-shaped uneven shapes extending in directions intersecting each other on both surfaces of the plate material. If wavy irregularities with groove-like parts are formed on the back side of the bowl-shaped part on both sides of the plate material, the upper mold and the lower mold should be pressed surfaces with irregularities corresponding to each other, and deformation of the plate material Is easy to process because it only needs to undergo bending deformation without much change in thickness.
  • the surface direction of the upper mold presser and the surface direction of the lower mold presser are as described above. By arranging them so as to cross each other, a highly accurate uneven shape can be obtained in a short time.
  • the slide parts of the upper mold and the lower mold have the same planar shape as that of the blank after molding, and one of the upper mold and the lower mold
  • the base portion includes a guide portion formed so as to surround the slide portion in the horizontal direction and extend above and below the slide portion, and the other slide portion of the upper die and the lower die enters the surrounding space of the guide portion.
  • the closed cavity for press working can be formed by the guide portion and the slide portions of the upper die and the lower die.
  • the present invention is also characterized in that a concavo-convex shape is simultaneously formed on the front and back surfaces of a plate material using any of the molds of (2) to (6) above.
  • a sheet metal press working method is provided.
  • a pressed product with excellent characteristics based on the characteristics of the molds (2) to (6) can be obtained in a short time with respect to a plate-shaped blank.
  • pre-pressing can be performed in advance with another mold so that the molding area of the blank in the blank is recessed shallower than the deformation height of the pressing element.
  • the convex portion press-molded by the pressing element rises from the concave surface, so that the height of the convex portion can be accurately controlled. Therefore, for example, it is advantageous also when obtaining the height of the convex part of the same plane as the peripheral part of the molded product.
  • the temperature of the contact portion with the blank in the upper mold and the lower mold is 230 to 400 ° C.
  • the slide section of the upper mold and the lower mold After contacting the blank, it is desirable that the press speed to the bottom dead center is 0.5 to 30 mm / second.
  • the temperature of the contact portion is lower than 230 ° C., the material flow during pressing cannot be sufficiently obtained, and it is difficult to obtain an accurate uneven shape.
  • the temperature of the said contact part exceeds 400 degreeC, the coarsening of the crystal grain of a blank will arise and the material of a molded article will be reduced.
  • the pressing speed is higher than 30 mm / second, the material flow cannot be sufficiently obtained, and an accurate uneven shape cannot be obtained.
  • the press speed is lower than 0.5 mm / sec, there is no problem with the quality of the molded product, but it is not desirable because it causes useless processing time.
  • the sheet metal press working method of (1) or (7) to (10) can be advantageously applied when the blank is a sheet material for a fuel cell separator.
  • the separator for a fuel cell has a shape having a large number of grooves for gas flow on both surfaces of a central portion of a flat plate. Therefore, if the above-described sheet metal pressing method is applied to press the groove, a pressed product having excellent characteristics based on the characteristics of these methods can be obtained in a short time.
  • a plurality of narrow grooves for gas flow paths are juxtaposed by sheet metal pressing, and the narrow groove on one surface and the narrow groove on the other surface intersect each other.
  • the present invention provides a fuel cell separator characterized by being arranged in a direction to be operated.
  • the separator for a fuel cell has a shape having a large number of gas flow grooves on both sides of the central portion of the flat plate.
  • the narrow groove on one surface and the narrow groove on the other surface have What is arranged in the direction intersecting each other is based on shortening the press time compared to the conventional warm-forged product separator made from a bulk material by using a sheet metal stamped product in this way. High accuracy can be provided at a low price.
  • the sheet metal pressing may be performed by any of the methods (1) or (7) to (11). According to this method, it is possible to provide a press-processed product having excellent characteristics based on the features of the sheet metal press-processing method of (1) or (7) to (10) at a low price.
  • the fuel cell separator can be subjected to surface processing such as corrosion-resistant coating after the above processing, if necessary.
  • FIG. 1 is a perspective view schematically showing a part of a fuel cell including a fuel cell separator according to an embodiment of the present invention in an exploded state. It is a front view of the separator for fuel cells shown in FIG. It is an enlarged view centering on the groove part in FIG. It is a front view of the upper mold
  • FIG. 1 schematically shows a part of a fuel cell including a fuel cell separator according to an embodiment of the present invention.
  • This fuel cell separator is based on a sheet metal press working method according to the present invention and a separator manufactured using a mold for the method as described below.
  • the fuel cell comprises a unit comprising a fuel electrode 20 comprising a catalyst layer 21 and a porous support 22, an air electrode 30 comprising a catalyst layer 31 and a porous support 32, and an electrolyte layer 40 positioned therebetween.
  • Many separators are stacked, and separators 10 are arranged between the units.
  • FIG. 1 shows one unit and separators 10 on both sides thereof in an exploded state.
  • the separator 10 includes narrow grooves 11 and 12 that extend so as to be orthogonal to each other on the front and back surfaces.
  • a fuel gas such as hydrogen is supplied to the narrow groove 11 on the side facing the fuel electrode 20 to the air electrode 30.
  • Oxygen is supplied to the narrow groove 12 on the facing side by air or the like.
  • FIG. 2 is a front view showing one separator 10 taken out
  • FIG. 3 is an enlarged view centering on the groove portion in FIG.
  • the separator is made of a rectangular magnesium alloy
  • the narrow groove 12 shown in FIG. 1 is formed at the center of the separator and is surrounded by a flat peripheral portion 14.
  • the narrow grooves 12 are formed between the flanges 13 and extend in the vertical direction, and form a group for every five grooves.
  • the flanges 13 located between the groups are alternately extended upward and downward to reach the peripheral part 14, and the other flanges 13 form a side groove 15 with a gap between the peripheral parts 14. is doing.
  • a large number of narrow grooves 12 are formed in a rectangular region as a whole, and air holes 16 serving as gas passages are formed in each corner of the rectangle by through holes.
  • a communication groove 17 reaching the side groove 15 in the immediate vicinity extends from the vent hole 16 located at the upper right and lower left in FIG.
  • a similar narrow groove extends in a direction orthogonal to the narrow groove 12 in a corresponding portion on the back surface of the separator, and a communication groove reaching a nearby side groove from the upper left and lower right vent holes 16 in FIG. 17 'extends (indicated by broken lines in the figure).
  • the flange portion 13 is the same height as the peripheral portion 14 on both the front and back sides, and the tip thereof is on the same plane as the peripheral portion 14.
  • the gas introduced into the vent hole 16 flows so as to undulate the numerous fine grooves 12, and is led out from the vent hole 16 at the diagonal position.
  • the air introduced from the ventilation hole 16-1 shown in FIG. 3 reaches the side groove 15-1 immediately after passing through the communication groove 17-1, and the five narrow grooves which are the first group communicating with the side groove. 12-1 flows through the lower side groove 15-2, and then flows through the next group of fine grooves 12-2 to reach the upper side groove 15-3. In this way, the air flows while undulating the narrow grooves 12, contacts the air electrode 30, is led out from the vent hole 16 located in the lower left of FIG. 2, and flows to the next unit.
  • the fuel gas introduced from the vent hole 16 located in the lower right of FIG. 2 flows while undulating a large number of pores extending in the horizontal direction, contacts the fuel electrode 20, and is located in the upper left of FIG. It is led out from the vent hole 16 and flows to the next unit.
  • the two pairs of diagonally arranged vent holes 16 are divided into fuel gas and air (oxygen). Can be used.
  • the illustrated separator has a vertical and horizontal dimension of 100 mm and a thickness of 2 mm, and the narrow grooves 11 and 12 and the flange 13 each have a width of 0.75 mm and a groove depth of 0.95 mm.
  • these dimensions can be appropriately determined according to the dimensions of the fuel cell and the characteristics of the electrode material.
  • the magnesium alloy constituting the separator can be of various components used in general fuel cell separators.
  • a main additive component to magnesium 2.5 to 3.5 Al is added.
  • FIG. 4 is a front view showing the upper mold 100 and the lower mold 200 constituting the mold.
  • the upper mold components are indicated by numbers in the 100s
  • the lower mold components are indicated by numbers in the 200s
  • the 1-digit and 2-digit portions of these numbers are indicated by the upper mold and the lower digits.
  • the component corresponding to the mold shall be indicated.
  • type 200 have arrange
  • the upper mold 100 includes a base 110 that is attached to a driving frame (not shown) and moves up and down during press working.
  • the base 110 is fixed to the lower surface of the intermediate plate 112 having a fixed portion 111 fixed to the lower portion of the drive frame, an intermediate plate 112 fixed to the lower surface of the fixed portion, and a rectangular space in the central portion. And a go portion 113.
  • the support body 120 is fixed to the lower surface of the intermediate plate 112 so as to be accommodated in the space of the surrounding portion 113, and a large number of pressing elements 130 are fixed to the support body.
  • the pressing element 130 is formed of a plate-like body extending in the vertical direction, and is arranged in parallel with a minute interval in a state of facing each other, extends downward in a comb-like shape from the support body 120, and a tip portion to the blank It is a contact part.
  • FIG. 5 is a perspective view showing the support bodies 120 and 220, the pressing elements 130 and 230, and the slide parts 140 and 240 of the upper mold 100 and the lower mold 200.
  • the pressing element 130 of the upper mold 100 and the pressing element 230 of the lower mold 200 each having a plate shape are arranged so that the surface directions are orthogonal to each other.
  • the support 120 includes an inner plate 121 positioned on the upper side and an outer plate 122 positioned below the inner plate.
  • the outer plate 122 is formed with a through hole that receives the presser 130.
  • the presser 130 is passed through the through hole and abuts the lower surface of the inner plate 121, and a through hole provided in the same position of each presser 130 and a corresponding through hole provided in the outer plate 122.
  • Bolts 123 are passed through and fixed to the outer plate 122.
  • the presser 130 of the upper mold 100 and the presser 230 of the lower mold 200 are provided corresponding to the narrow grooves 11 and 12 of the fuel cell separator shown in FIGS. 1 and 2, respectively.
  • a slide part 140 is mounted below the support 120 in the space of the surrounding part 113 so as to be movable up and down.
  • the slide part 140 has a plurality of elongated through holes that allow the pressing elements 130 to pass individually, is supported by the base part 110 so as to be movable up and down, and has a distal end side as a contact surface with the blank.
  • the slide part 140 is arranged so that the tip of the pressing element 130 protrudes from the through hole in the raised retreat position, and the tip part of the pressing element 130 is accommodated in the through hole in the lowered advance position. .
  • the protruding amount of the pressing element 130 when the sliding part 140 is retracted is determined so that the tip of the pressing element 130 protrudes from the surface of the sliding part 140 surrounding the pressing element 130 over a length corresponding to the depth of the narrow groove of the separator. .
  • the slide portion 140 receives a spring force toward the forward movement position, and is in the forward movement position when no press pressure is applied.
  • through holes extending in the vertical direction are formed at the four corners of the outer plate 122 and the inner plate 121, and the compression coil spring 150 is inserted therein.
  • the spring 150 abuts on the intermediate plate 112 at the upper end and abuts on the slide portion 140 at the lower end, thereby applying a spring force directed toward the forward movement position (downward) to the slide portion 140.
  • FIG. 6 is a plan view of the member shown in FIG. 5
  • FIG. 7 is a longitudinal sectional view taken along line VII-VII in FIG. 6
  • FIG. 8 is a stepwise longitudinal sectional view taken along line VIII-VIII in FIG.
  • FIGS. 7A and 8A show a state where the slide portion 140 is in the forward position
  • FIGS. 7B and 8B show a state where the slide portion 140 is in the backward position.
  • the slide portion 140 is guided by the surrounding portion 113 and is movable in the vertical direction, and is prevented from coming down downward by a bolt B160. That is, the bolt B160 has a head 161 at one end, and is provided with a threaded portion 163 at the tip via a columnar body 162.
  • the inner plate 121 and the outer plate 122 are provided with through holes having a diameter smaller than that of the head 161 of the bolt B160 and allowing the body portion 162 to pass therethrough, and the slide portion 140 is provided with a female screw.
  • the bolt B160 has a head 161 located in a recess 1120 provided at the lower portion of the intermediate plate 112, the body portion 162 passes through the inner plate 121 and the outer plate 122, and the screw portion 163 at the tip is a female screw of the slide portion 140. It is screwed.
  • the bolts B160 are arranged at four locations shown in FIG. 5, but the position and number of these bolts B160 are appropriately determined. In this state, the slide part 140 is pressed by the coil spring 150 and is in the advanced position, and a gap S is formed between the slide part 140 and the outer plate 122 as shown in FIGS. 7 (a) and 8 (a).
  • the bolt B160 rises a distance corresponding to the gap S with respect to the inner plate 121 and the outer plate 122.
  • the recess 120 of the intermediate plate 112 is formed with a depth that allows the bolt B160 to rise.
  • the slide parts 140 and 240 of the upper mold 100 and the lower mold 200 have the same planar shape as that of the blank after molding.
  • the slide part 140 of the upper mold 100 is located at a position where the lower end protrudes downward from the lower surface of the surrounding part 113 in both the forward movement position and the backward movement position.
  • the slide portion 240 of the lower mold 200 has an upper end portion at a position below the upper surface of the surrounding portion 213 in both the forward position and the retracted position, and as a result, exceeds the upper surface of the sliding portion 240 in the surrounding portion 213.
  • a portion extending upward serves as a guide portion 213 a that receives the blank and the slide portion 140 of the upper mold 100.
  • the fixing between the members of the fixing portion 111, the intermediate plate 112, the surrounding portion 113, the inner plate 121, and the outer plate 122 is performed by through bolts B indicated by broken lines in the drawing.
  • the intermediate plate 112 and the surrounding portion 113 are formed with a circulation path H for passing a heat medium.
  • a blank 1 shown in FIG. 9A is prepared.
  • This blank is a rectangular plate material corresponding to the outer shape of the separator, and indented portions 2 having a concave shape in plan view are formed in advance on each side of the blank so as to correspond to the amount of extension by press working.
  • primary pre-pressing is performed so that the molding region formed by the pressers 130 and 230 is recessed shallower than the deformation height by the presser to form the recessed portion 3. .
  • the plate material extends in the plane direction, the recessed portion 2 is eliminated, and each side of the blank becomes linear.
  • it is desirable that the preliminary pressing is performed with a mold having a closed cavity having a dimension after deformation.
  • This pressing is performed by placing a blank on the slide part 240 of the lower die 200 and lowering the upper die 100 (or raising the lower die 200).
  • the upper and lower molds are close to each other, and first, the slide portions 140 and 240 are in contact with the blank.
  • the slide parts 140 and 240 resist the spring force of the coil springs 150 and 250 to the retracted positions shown in FIGS. 7 (b) and 8 (b). It moves and the plate-shaped pressers 130 and 230 protrude from the through hole of the slide portion.
  • the material in contact with the pressing element is discretely deformed into a concave shape, and the material positioned between the pressing elements is pushed and concentrated between the pressing elements.
  • the material rises between the pressing elements and fills the space surrounded by the pressing elements and the slide portion.
  • the blank is formed with a concavo-convex shape composed of convex portions (grooves) due to concentration of material and discrete concave portions (thin grooves).
  • the height becomes the same as the area around the narrow groove forming area in the blank.
  • the thickness of the blank does not change.
  • the material also moves from the central part to the peripheral part.
  • the space for accommodating the blank is closed by the guide part 213a, the extension to the peripheral part is limited, and the whole As a result, a molded product having an accurate dimension is obtained.
  • the temperature of the contact portions of the pressers 130 and 230 and the slide portions 140 and 240 with the blank is 230 to 400 ° C.
  • the pressing speed is preferably 0.5 to 30 mm / second after the upper and lower slide sections 140 and 240 are in contact with the blank and before the bottom dead center.
  • the holding time is preferably up to 10 seconds in consideration of production efficiency.
  • the through holes 18 and 19 are formed to obtain the separator 10.
  • the fuel cell separator can be manufactured in a short time. Further, heat treatment such as blank annealing is not required in advance for manufacturing, and the manufacturing time is short in this respect as well, but heat treatment may be performed as necessary.
  • a rectangular blank having a vertical and horizontal dimension of 100 mm and a thickness of 2 mm was formed from a AZ31 magnesium alloy plate.
  • an arc-shaped recessed portion that was recessed 6 mm from a straight line connecting the corners at the center of the side was formed by a cutting press.
  • a concave portion having a depth of 0.4 mm was formed in a region where a narrow groove was to be formed by a primary preliminary press, and a side groove 15 and a communication groove 17 were formed by a secondary preliminary press.
  • the press work was performed using the metal mold
  • the press device is a servo motor press having an output of 300 tons, and the pressers 130 and 230 and the slide portions 140 and 240 of the mold are made of SKD11.
  • the temperature of the contact portion with the blank in these portions is as follows.
  • the heat medium was supplied to the circulation path H so that it might become 350 degreeC.
  • the blank was placed on the slide part 240 of the lower mold 200, the upper mold 100 was lowered, and after the slide part 140 was in contact with the blank, the lowering speed was 1.5 mm / second. And after hold
  • the narrow grooves 11 and 12 are accurately formed in a rectangular cross section, and the dimensional accuracy is 0.75 ⁇ 0.02 mm in width and 0.95 ⁇ 0.03 mm in depth, It was good.
  • the present invention is not limited to the above embodiment, and various modifications can be made.
  • the dimensions of each part are not limited to those described above, and various shapes and dimensions can be used depending on the application.
  • the direction in which the gas channel narrow groove extends may be perpendicular to the front and back of the separator, cross at another appropriate angle, or extend in the same direction.
  • the pressing element When the pressing element is formed of a plate-like body and is arranged in parallel with a minute interval in a state of facing each other, as in the above embodiment, the pressing element corresponds to all the narrow grooves of the separator.
  • a single groove or multiple grooves are formed on the surface of the separator in a single press process, which is necessary for multiple press processes. It is also possible to form a small number of narrow grooves.
  • one or a plurality of pressing elements are provided on the first press working mold, and a pressing element corresponding to the narrow groove to be formed next is added to the previous pressing element at the second and subsequent presses. Provide in the mold.
  • the blank does not necessarily need to be pressed in the closed space depending on the concavo-convex shape and the accuracy required for it, and in that case, the guide portion 213a can be omitted.
  • the presser can be formed in various shapes such as a columnar shape and a block shape, and the tip of the presser corresponds to the molded product without providing a slide portion. It is good also as an uneven
  • the sheet metal press working method and the mold for the same according to the present invention are not limited to the production of a fuel cell separator, and can be applied to the production of various articles.
  • a cooling plate disposed between components that generate heat, such as an electronic component has meandering grooves on the front and back surfaces and forms a coolant channel between the wall surfaces of the component.
  • the plate-like article having such a groove is made of magnesium or a magnesium alloy, and thus has the advantages of excellent heat conduction, light weight and good electromagnetic shielding properties, and the present invention is advantageous for its production. Can be applied to.
  • the blank material can be aluminum or aluminum alloy of JIS 1000 to 5000, and sheet metal pressing is performed under the same processing conditions as in this embodiment. Can do. It is also possible to use blanks made of other metal materials that can be processed, such as titanium or titanium alloys.

Abstract

L'invention porte sur un procédé de travail à la presse pour un matériau métallique en plaque, lequel procédé utilise une matrice ayant une matrice supérieure et une matrice inférieure qui ont des surfaces de pression dont les contours sont déterminés de telle sorte que des irrégularités de surface composées de protubérances provoquées par une concentration d'un matériau de fluide durant le travail à la presse et de creux provoqués par la diffusion du matériau fluide durant le travail à la presse sont formées sur chacun des côtés avant et arrière de l'ébauche. Le procédé de travail à la presse prévoit de chauffer les sections de contact des matrices qui viennent en contact avec l'ébauche et de former simultanément les irrégularités de surface sur les deux côtés du matériau en plaque, de telle sorte que les creux des irrégularités sur un côté ne correspondent pas aux protubérances des irrégularités sur le côté opposé. Le procédé peut produire en un temps court un produit formé métallique ayant les irrégularités de surface sur les côtés avant et arrière du produit, les irrégularités sur chaque côté ne correspondant pas les unes aux autres.
PCT/JP2009/050969 2008-01-31 2009-01-22 Procédé de travail à la presse pour tôle métallique, matrice pour celui-ci, et produit formé WO2009096309A1 (fr)

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CN109119652A (zh) * 2017-06-23 2019-01-01 丰田自动车株式会社 燃料电池用隔板的制造方法

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JP2000311663A (ja) * 1999-04-28 2000-11-07 Matsushita Electric Ind Co Ltd 封口板用弁体の成形装置
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JPH09234535A (ja) * 1996-02-29 1997-09-09 Japan Small Corp 鍛造品の前工程での形状決定方法および鍛造用金型の設計方法
JP2000311663A (ja) * 1999-04-28 2000-11-07 Matsushita Electric Ind Co Ltd 封口板用弁体の成形装置
JP2003531726A (ja) * 2000-04-28 2003-10-28 モルフィック テクノロジーズ アクティエボラーグ 中間荒打ちおよび最終成形を含むプレートの製造方法
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ305629B6 (cs) * 2014-06-17 2016-01-13 Zkl Hanušovice. A.S. Kovací nástroj pro kování mosazných polotovarů klecí valivých ložisek s předkovanými kapsami
CN109119652A (zh) * 2017-06-23 2019-01-01 丰田自动车株式会社 燃料电池用隔板的制造方法

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