JP5437094B2 - Press apparatus and press method - Google Patents

Description

  The present invention relates to a press device for forming a protrusion on a workpiece and a press method using the press device.

  In general, a solid oxide fuel cell (SOFC) uses an oxide ion conductor, for example, stabilized zirconia, as an electrolyte, and an electrolyte / electrode assembly in which an anode electrode and a cathode electrode are disposed on both sides of the electrolyte. (MEA) is sandwiched between separators (bipolar plates). This fuel cell is normally used as a fuel cell stack in which a predetermined number of MEAs and separators are stacked.

  In this type of fuel cell, a metal separator is used, and a plurality of protrusions (embosses) and the like are formed in order to collect electricity obtained by the power generation reaction from the electrolyte / electrode assembly. Usually, the greater the number of protrusions, the higher the current collection efficiency. Therefore, it is desired to form a large number of protrusions on the current collecting part having a certain area.

  However, when a large number of protrusions are press-formed on the metal plate constituting the separator, it is difficult to accurately form the protrusions within a certain area while accurately maintaining the shape of the protrusions. There is. In addition, with respect to a large number of protrusions, the respective heights cannot be controlled and molded with high accuracy. Furthermore, if the protrusions are to be densely formed, the workpiece, particularly a thin metal plate, is locally thinned by the protrusions, and there is a problem that the separator strength is considerably reduced.

  Thus, for example, in the embossing press die disclosed in Patent Document 1, a male die 2 having a columnar embossed ski 1 and the tip of the embossed ski 1 can be loosely inserted as shown in FIG. And a female die 4 provided with a concave portion 3. A movable plate 6 having a through hole 5 into which the embossed ski 1 can be inserted is attached to the male mold 2 via a discharge spring 7 so as to be movable up and down along the embossed ski 1.

  The tip of the embossed ski 1 protrudes from the surface of the movable plate 6 when the discharge spring 7 is compressed and the movable plate 6 moves, and the female mold 4 has a stepped portion that protrudes from the peripheral portion of the contour of the recess 3. 8 is provided.

  The embossing press die configured as described above is provided with the step portion 8 on the female die 4 side so that the interval between the embossing switch portions can be reduced to about 2 mm.

  Further, in the press-forming method of the pin-shaped boss disclosed in Patent Document 2, a metal plate (plate material) is crushed between the tapered die by pressing a tapered tip punch into the plate material, and the metal plate is tapered. Formed by a preliminary process of forming a boss with a boss, a redrawing process of redrawing the tapered boss formed on the metal plate by the preliminary process to a predetermined diameter to form a vertical boss, and the redrawing process. A pin-like boss is integrally formed on a part of the metal plate through a re-striking process in which the entire vertical boss is re-striated.

  As a result, the pin-shaped boss is formed not by the elongation of the material as in the past, but mainly by the combination of plastic flow of the material by crushing and re-drawing. It can be formed.

  Furthermore, the metal plate embossing method disclosed in Patent Document 3 uses a pair of press dies composed of a convex die and a concave die to form a plurality of circular protrusions on the metal plate by pressing in one step. A method of embossing a metal plate, wherein, before embossing, a plurality of stacked plates are overlapped at least on the surface of the metal plate in contact with the die, and then a plurality of stacked plates are stacked on the surface of the metal plate. It is characterized in that a plurality of circular protrusions are completed by performing ironing on a portion that becomes a vertical wall portion of the circular protrusion.

  As a result, it is only necessary to prepare a pair of press dies consisting of a punch provided with a plurality of convex portions and a die provided with a plurality of concave portions corresponding to the punch. Even in this case, an embossed molded product in which circular protrusions with high height are arranged can be obtained efficiently.

JP-A-5-192998 JP 2000-158053 A JP2008-296246

  However, in Patent Document 1 described above, the embossing interval cannot be set even smaller, and in practice, it is difficult to form a large number of protrusions on the current collecting part having a constant area. Furthermore, it is impossible to form a plurality of embosses densely. Moreover, there is a problem that it is not possible to easily cope with a design change such as a change in the height of the emboss.

  Moreover, in said patent document 2, although a pin-shaped boss | hub can be integrally molded in a part of metal plate, there exists a problem that the said pin-shaped boss | hub cannot be shape | molded to the whole said metal plate. In addition, there is a problem that the number of steps for producing the pin-shaped boss is large and it is not economical.

  Furthermore, in said patent document 3, it is necessary to overlap | superpose a laminated board for every shaping | molding. Thereby, there is a problem that the number of processes increases and it is not economical. In addition, there is a problem that it cannot be applied to the formation of fine protrusions.

  The present invention solves this type of problem, and a plurality of protrusions are densely and economically formed within a certain area, and the height adjustment of the protrusions is simplified to change the design of the protrusions. An object of the present invention is to provide a pressing apparatus and a pressing method that can easily cope with the above.

  The present invention relates to a press device for forming a protrusion on a workpiece.

The pressing device has a first pin-shaped mold having a pin-shaped first convex portion corresponding to the shape of the protrusion, and faces the first pin-shaped mold, and corresponds to the tip shape of the protrusion. A second pin-shaped mold having a pin-shaped second convex portion, a convex-side mold on which the first pin-shaped mold is disposed so as to be able to advance and retract, and the second pin-shaped mold can be freely advanced and retracted A concave mold that is disposed and that forms the protrusion on the workpiece when the first pin mold is entered while the workpiece is sandwiched between the first and second pin molds. And a position adjusting member for adjusting the position of at least one of the first pin-shaped mold and the second pin-shaped mold in the axial direction.

  Further, the second pin-shaped mold has a pin base portion having a diameter larger than that of the second convex portion, while the concave mold corresponds to the outer diameter dimension of the projection portion and the first convex portion and And a step portion that is provided on an inner peripheral surface that forms the hole portion and that engages with a boundary shoulder portion between the second convex portion and the pin base portion. preferable.

  Therefore, in the second pin-shaped mold, the second convex portion which is the press surface is configured to have a diameter smaller than that of the pin base portion, and thus a protrusion having a diameter as small as possible can be formed. And since only a 2nd convex-shaped part is comprised by a small diameter, it becomes possible to suppress the fall of the intensity | strength of a 2nd pin-shaped metal mold | die.

  Furthermore, it is preferable that the first pin-shaped mold has a pin base portion having a diameter larger than that of the first convex portion, and the outer peripheral end surface of the first convex portion is chamfered. For this reason, since the 1st convex-shaped part which is a press surface is comprised more narrowly than a pin base | substrate part, a 1st pin-shaped metal mold | die can shape | mold a projection part as small as possible. And since only a 1st convex-shaped part is comprised by a small diameter, it becomes possible to suppress the fall of the intensity | strength of a 1st pin-shaped metal mold | die.

  In addition, the first convex portion is chamfered. Thereby, when forming a projection part with a 1st pin-shaped metal mold | die and a concave side metal mold | die, buckling is not induced at the site | part restrict | squeezed by the said projection part in a workpiece | work.

  Furthermore, the convex mold is provided with a plurality of first through holes for individually inserting a plurality of first pin-shaped molds, and the concave mold has a plurality of second pin-shaped molds. It is preferable that a plurality of second through holes for individually inserting the molds are provided.

  Therefore, just by inserting the first pin-shaped mold into the first through hole and inserting the second pin-shaped mold into the second through hole, the preparation of the pressing device is completed and the pressing process can be performed quickly. become. Moreover, for example, when any of the first pin-shaped molds is damaged, it is possible to easily cope with the problem by simply replacing the damaged first pin-shaped mold with a new first pin-shaped mold. be able to.

  In addition, the press device includes a first machining part that performs a first machining process on the workpiece, and a second machining part that performs a second machining process on the workpiece subjected to the first machining process, The plurality of first and second pin-shaped dies disposed at the first processing portion and the plurality of first and second pin-shaped dies disposed at the second processing portion are asymmetric with each other. The position is preferably set.

  For this reason, when a plurality of projections are formed by the second machining process after the plurality of projections are molded by the first machining process, the workpiece is molded by the first machining process. It does not overlap with multiple protrusions and is not pressed. Therefore, with a simple configuration, a plurality of protrusions can be densely formed on a work within a certain area.

  Furthermore, the position adjusting member is preferably a shim member that abuts at least the end of the first pin-shaped mold or the second pin-shaped mold opposite to the workpiece. As a result, the height of the protrusion can be set arbitrarily by simply changing the thickness of the shim member, and it is possible to cope with the design change of the protrusion with a simple and economical configuration. become.

  Furthermore, the present invention relates to a pressing method for sequentially arranging a workpiece at least at a first machining site and a second machining site and forming a protrusion on the workpiece.

  A convex mold in which a plurality of first pin-shaped molds having pin-shaped first convex portions corresponding to the shape of the protrusions are disposed in the first and second processed parts, and the first pin A concave mold in which a plurality of second pin-shaped molds having a pin-shaped second convex part corresponding to the shape of the tip of the projecting part are disposed, and the first pin-shaped mold A position adjusting member for adjusting the position of at least one of the mold and the second pin-shaped mold in the axial direction is provided.

  Then, in this pressing method, the first pin-shaped mold is placed in the concave mold in a state where the work is disposed at the first processing site and the work is sandwiched between the plurality of first and second pin-shaped molds. A step of forming protrusions on the workpiece by entering the workpiece, and the workpiece is arranged from the first machining site to the second machining site, and the workpiece is formed by a plurality of the first and second pin-shaped molds. When the first pin-shaped mold enters the concave-side mold in a state where the workpiece is sandwiched, a new projection is formed between the projections formed at the first machining site on the workpiece. And a process of performing.

  Further, in this pressing method, a plurality of first and second pin-shaped dies disposed at the first machining site, and a plurality of first and second pin-shaped dies disposed at the second machining site, Are preferably set at asymmetric positions. For this reason, by sequentially pressing the workpiece at the first machining site and the second machining site, the protrusions do not overlap with the workpiece. Thereby, it becomes possible to densely mold a plurality of protrusions on a work within a certain area with a simple configuration.

  Furthermore, it is preferable that the plurality of first pin-shaped dies and the concave-side dies perform the press forming of the work in the vicinity of exceeding the yield point of the work. Therefore, when the protrusion is formed by giving permanent distortion to the workpiece, it is possible to prevent the thin plate-shaped workpiece from being damaged particularly without yielding excessively.

  According to the press device according to the present invention, it is possible to easily cope with various different shaped protrusions by simply exchanging the first and second pin-shaped dies. In addition, it is possible to arbitrarily set the height of the protrusion only by changing the thickness of the position adjusting member. Thereby, it is possible to cope with a change in the design of the protrusion with a simple and economical configuration.

  Further, according to the pressing method according to the present invention, after a plurality of protrusions are formed on the workpiece arranged at the first machining site, the workpieces are arranged at the second machining site to form a plurality of projections. Has been. At that time, the plurality of projections formed at the first processing site and the plurality of projections formed at the second processing site do not overlap each other. Accordingly, it is possible to suppress the occurrence of springback, mold distortion, and the like, and to form a plurality of protrusions on the work in a precise area with high accuracy with a simple process.

It is a principal part disassembled perspective explanatory drawing of the press apparatus which concerns on embodiment of this invention. It is the II-II sectional view taken on the line of the said press apparatus in FIG. It is a principal part expanded sectional view of the said press apparatus. It is a schematic exploded perspective view of a fuel cell in which a separator that is press-molded by the press device is incorporated. It is a partially exploded perspective view showing the gas flow state of the fuel cell. It is a plane explanatory view of the lower mold which constitutes the press apparatus. It is expansion explanatory drawing which shows operation | movement of the said press apparatus. It is explanatory drawing of the press method which concerns on embodiment of this invention. In the said pressing method, it is explanatory drawing of the state by which the workpiece | work is arrange | positioned at the said lower mold | type. In the said pressing method, it is explanatory drawing of the state which the upper mold | type descended. It is explanatory drawing at the time of shape | molding a projection part in the said workpiece | work in the said pressing method. It is explanatory drawing of the state in which the said workpiece was reversed in the said pressing method. It is front explanatory drawing of another separator which is the said workpiece | work. It is explanatory drawing of the press die for embossing currently disclosed by patent document 1. FIG.

  1 to 3 show a press device 10 according to an embodiment of the present invention. For example, as shown in FIGS. 4 and 5, the workpieces press-molded by the press device 10 are first and second separators 14 a and 14 b constituting the fuel cell 12.

  The fuel cell 12 is a solid electrolyte fuel cell. For example, an anode electrode 18 and a cathode electrode 20 are provided on both surfaces of an electrolyte (electrolyte plate) 16 made of an oxide ion conductor such as stabilized zirconia. An electrolyte / electrode assembly (MEA) 22 is provided. The electrolyte / electrode assembly 22 is formed in a disc shape, and a barrier layer (not shown) is provided at least on the outer peripheral end surface portion to prevent entry and discharge of the oxidant gas and the fuel gas. Yes.

  In the fuel cell 12, a plurality of, for example, two electrolyte / electrode assemblies 22 are sandwiched between the first and second separators 14a and 14b. The first separator 14a and the second separator 14b are configured by reversing the same-shaped separator structure by 180 ° from each other.

  The first separator 14a includes, for example, a first plate 24a and a second plate 26a configured by press-molding a sheet metal such as stainless steel. The first plate 24a and the second plate 26a are joined to each other by diffusion bonding, resistance seam welding, laser welding, brazing, or the like.

  The first plate 24a is formed in a substantially flat plate shape, and includes a fuel gas supply unit 30 in which a fuel gas supply communication hole 28 for supplying fuel gas along the stacking direction (arrow A direction) is formed. First sandwiching portions 34 a and 34 b are integrally provided via two first bridge portions 32 a and 32 b extending outward from the fuel gas supply portion 30.

  The first sandwiching portions 34a and 34b are set to have substantially the same dimensions as the electrolyte / electrode assembly 22, and a plurality of projections 36a having a current collecting function are provided on the surface contacting the electrolyte / electrode assembly 22. 36b is provided. Fuel gas passages 38 a and 38 b for supplying fuel gas along the electrode surface of the anode electrode 18 are formed between the plurality of protrusions 36 a and 36 b and the electrolyte / electrode assembly 22. Fuel gas supply ports 40a and 40b for supplying fuel gas toward the substantially central portion of the anode electrode 18 are formed in the substantially central portions of the first sandwiching portions 34a and 34b.

  The second plate 26a has a fuel gas supply part 42 in which a fuel gas supply communication hole 28 is formed. First sandwiching portions 46a and 46b are integrally provided via two first bridge portions 44a and 44b extending outward from the fuel gas supply portion 42. A circumferential projection 48 is provided around the outer periphery of the second plate 24a so as to protrude toward the first plate 24a. A welded portion 49 set on the outer circumference of the first plate 24a is joined to the circumferential projection 48. The

  The surfaces of the fuel gas supply unit 42, the first bridge portions 44a and 44b, and the first sandwiching portions 46a and 46b that face the first plate 24a are in contact with the first plate 24a and have a function of preventing collapse against a load in the stacking direction. A plurality of protrusions 56 are formed.

  Fuel gas supply passages 58a and 58b communicating with the fuel gas supply communication hole 28 are formed between the first bridge portions 32a and 44a and between the first bridge portions 32b and 44b. The fuel gas supply passages 58a and 58b communicate with the fuel gas supply ports 40a and 40b via the fuel gas filling chambers 60a and 60b formed between the first holding parts 34a and 46a and between the first holding parts 34b and 46b. To do.

  The second separator 14b is configured in the same shape as the first separator 14a, and includes a first plate 24b and a second plate 26b corresponding to the first plate 24a and the second plate 26a. The first plate 24b and the second plate 26b have oxidant gas supply parts 64 and 66 in which oxidant gas supply communication holes 62 for supplying an oxidant gas along the stacking direction are formed.

  The first plate 24b and the second plate 26b are connected to the second sandwiching portions 72a, 72b, and 74a via two second bridge portions 68a, 68b, and 70a and 70b that protrude outward from the oxidizing gas supply portions 64 and 66, respectively. 74b are integrally provided.

  The second sandwiching portions 72 a and 72 b are set to have substantially the same dimensions as the electrolyte / electrode assembly 22, and a plurality of current collecting functions are provided on the surface in contact with the cathode electrode 20 constituting the electrolyte / electrode assembly 22. Protrusions 75a and 75b are provided. Oxidant gas passages 76 a and 76 b for supplying an oxidant gas along the electrode surface of the cathode electrode 20 are formed between the plurality of protrusions 75 a and 75 b and the electrolyte / electrode assembly 22. Oxidant gas supply holes 78a and 78b for supplying an oxidant gas toward the substantially central part of the cathode electrode 20 are formed in the substantially central parts of the second sandwiching parts 72a and 72b.

  In the second plate 26b, oxidant gas supply passages 80a and 80b communicating with the oxidant gas supply communication hole 62 by joining the first plate 24b are provided between the second bridge portions 68a and 70a and the second bridge. It is formed correspondingly between the portions 68b and 70b. In the second sandwiching portions 74a and 74b, oxidant gas filling chambers 82a and 82b communicating with the oxidant gas supply communication hole 62 through the oxidant gas supply passages 80a and 80b are formed.

  As shown in FIGS. 1-3, the press apparatus 10 shape | molds several protrusion part 36a, 36b (and several protrusion part 75a, 75b in the 1st plate 24b) to the 1st plate 24a, for example. The lower mold 90 is a fixed mold, and the upper mold 92 is a movable mold that can be moved back and forth (lifted and lowered) with respect to the lower mold 90.

  The lower mold 90 includes a fixed punch plate 94, and guide rods 96 are erected at the four corners of the punch plate 94. In each guide rod 96, an elevating rod 98 is disposed so as to be movable up and down via a spring 100 (see FIGS. 1 and 2). A punch holder (convex mold) 102 is fixed at the center of the punch plate 94, and a plurality of first pin-shaped molds 104 are disposed in the punch holder 102 in a replaceable manner.

  As shown in FIG. 3, the first pin-shaped mold 104 has pin-shaped first convex portions 104a corresponding to the shapes of the protrusions 36a, 36b, 75a and 75b (hereinafter also simply referred to as the protrusions 36a). Have. The first convex portion 104a is set to a predetermined length, and a large-diameter pin base portion 104b is integrally provided at the rear end portion. A chamfering process such as electron beam machining is performed on the tip of the first convex portion 104a.

  As shown in FIGS. 2 and 4, the punch holder 102 corresponds to the shape of the first plates 24a and 24b (hereinafter also simply referred to as the first plate 24a), and the first plate 24a is subjected to a first processing treatment. There are provided a first processing part 106a for applying a second processing part 106b for applying a second processing to the first plate 24a. In order to arrange a plurality of first pin-shaped dies 104, first through holes 108a constituting a plurality of stepped hole portions are formed in the first processed portion 106a. Similarly, in order to arrange a plurality of first pin-shaped molds 104, first through holes 108b constituting a plurality of stepped hole portions are formed in the second processed portion 106b.

  The number of the first through holes 108a and 108b is set to half of the protrusions 36a formed in the first plate 24a, and the first through holes 108a and 108b are set to asymmetric positions ( (See FIG. 6).

  Between the punch plate 94 and the punch holder 102, disk-shaped first adjustment shim members 110 a and 110 b that are in contact with the end of the first pin-shaped mold 104 opposite to the first plate 24 a are provided. It arrange | positions corresponding to the 1st and 2nd process part 106a, 106b. The first adjustment shim members 110a and 110b constitute position adjustment members, and adjust the position of the first pin-shaped mold 104 in the axial direction by adjusting the thickness. A plurality of blank positioning pins 112 are provided on the punch holder 102 so as to protrude outward from the first and second processing portions 106a and 106b.

  As shown in FIGS. 1 and 2, the upper mold 92 includes a die plate 114 that can be raised and lowered via a lifting mechanism (not shown). At the four corners of the die plate 114, there are provided cylindrical portions 116 with which the lifting rod 98 provided on the guide rod 96 of the lower mold 90 is fitted. A connect plate 118 is fixed to the die plate 114, and a die holder (concave die) 120 is attached to the connect plate 118.

  The die holder 120 is provided with first and second processing portions 122a and 122b corresponding to the first and second processing portions 106a and 106b of the lower mold 90. A plurality of second pin-shaped dies 124 are replaceably disposed in the first and second processing portions 122a and 122b, respectively. As shown in FIGS. 2 and 3, the second pin-shaped mold 124 has a pin-shaped second convex portion 124a corresponding to the tip shape of the protruding portion 36a, and the rear of the second convex portion 124a. A large-diameter pin base portion 124b is integrally formed on the end side.

  As shown in FIGS. 3 and 7, the die holder 120 is formed with a plurality of hole portions 126 corresponding to the first and second processed portions 122a and 122b, respectively. As shown in FIG. 7, the hole 126 corresponds to the outer diameter of the protrusion 36 a and provides a gap S between the first convex part 104 a of the first pin-shaped mold 104. On the inner peripheral surface that forms the hole 126, a step portion 128 is provided on which a shoulder portion 124c that is a boundary portion between the second convex portion 124a of the second pin-shaped mold 124 and the pin base portion 124b engages. . Each hole 126 is integrally formed coaxially with the second through holes 130a and 130b.

  The plurality of second through-holes 130a provided in the first processed part 122a and the plurality of second through-holes 130b provided in the second processed part 122b are distributed to half of the required number of protrusions 36a. Are set at positions asymmetric with respect to each other.

  Between the connection plate 118 and the die holder 120, second adjustment shim members (position adjustment members) 132a and 132b that are in contact with the ends of the second pin-shaped molds 124 on the side opposite to the first plate 24a are arranged. Is done. As shown in FIG. 2, a blank holder 138 is supported on the die plate 114 via a bolt 134 and a spring 136 so as to be movable up and down. The blank holder 138 is formed with a positioning hole 139 into which the blank positioning pin 112 is fitted.

  A method for press-molding the plurality of protrusions 36a on the first plate 24a constituting the first separator 14a using the press device 10 configured as described above will be described below.

  First, the thicknesses of the first adjustment shim members 110a and 110b and the second adjustment shim members 132a and 132b are set according to the height of the protrusion 36a of the first plate 24a. At that time, the axial positions of the first and second pin-shaped dies 104 and 124 are adjusted so that press molding is performed in the vicinity of the yield point of the first plate 24a when the first plate 24a is pressed. .

  As shown in FIGS. 8 and 9, when the first plate 24 a is arranged on the punch holder 102 on the lower mold 90, the first mold 24 of the plurality of first pin-shaped molds 104 is used in the lower mold 90. 104a protrudes upward from the upper surface of the punch holder 102 by a predetermined amount. For this reason, the 1st clamping parts 34a and 34b which comprise the 1st plate 24a are each arrange | positioned on the some 1st convex-shaped part 104a in the 1st and 2nd process site | parts 106a and 106b.

  Next, when the upper die 92 is lowered through a lifting mechanism (not shown), the blank holder 138 holds the outer peripheral portion of the first plate 24a, and the blank holder 138 is positioned with the blank positioning pin 112 of the lower die 90. It is positioned with respect to the lower mold 90 under the action of fitting with the hole portion 139.

  As shown in FIG. 11, when the die holder 120 is lowered while the first plate 24 a is positioned and held by the blank holder 138, the die holder 120 comes into contact with the first plate 24 a and starts pressing. Here, in the die holder 120, a plurality of second pin-shaped dies 124 are respectively disposed in the second through holes 130a and 130b so as to be able to advance and retreat, corresponding to the first and second processing parts 122a and 122b.

  For this reason, when the die holder 120 descends and presses the first plate 24a, the die holder 120 is coaxially disposed in the hole 126 communicating with the tip side of each of the second through holes 130a and 130b and protrudes upward from the punch holder 102. The first convex portion 104a relatively enters the hole 126 (see FIG. 7). Accordingly, the second pin-shaped mold 124 is raised relative to the die holder 120 in a state where the tip of the first convex portion 104a and the first plate 24a are sandwiched.

  As a result, the first pin-shaped mold 104 enters the hole 126 of the die holder 120 as a punch, and a desired number of half projections are respectively formed on the first plate 24a at the first and second processing portions 106a and 106b. The part 36a is press-molded. At that time, the lower end portion of the first pin-shaped mold 104 is in contact with the first adjustment shim members 110a and 110b, and the tip position of the first convex portion 104a is regulated. On the other hand, the upper end of the second pin-shaped mold 124 is in contact with the second adjustment shim members 132a and 132b, and the tip position of the second convex portion 124a is restricted. Therefore, the protrusion 36a to be press-formed is accurately formed to a desired height.

  Next, after the upper die 92 is raised and the upper die 92 is separated from the lower die 90, the first plate 24a is once taken out. The first plate 24 a is inverted 180 degrees around the vertical axis and then placed on the lower mold 90.

  As shown in FIG. 12, in the first plate 24a, a first clamping part 34a in which half of the protrusions 36a are formed in the first processed part 106a is disposed in the second processed part 106b, while the second processed part The first clamping part 34b in which half the protrusions 36b are formed at the part 106b is disposed at the first processing part 106a. In this state, similarly to the above, the upper die 92 is lowered to form a predetermined number of protrusions 36a, 36b on the first clamping portions 34a, 34b on the first plate 24a.

  In this case, in this embodiment, the first pin-shaped mold 104 of the punch holder 102 and the second pin-shaped mold 124 of the die holder 120 can be easily replaced with the protrusions 36a having various different shapes by simply replacing them. It can correspond to.

  In addition, it is possible to arbitrarily set the thickness of the protrusion 36a only by changing the thickness of the first adjustment shim members 110a and 110b and the second adjustment shim members 132a and 132b, which are position adjustment members. Thereby, the effect that it can respond to the design change of the projection part 36a favorably with a simple and economical structure is acquired.

  Further, the second pin-shaped mold 124 has a small-diameter second convex portion 124a integrally formed at the end of the large-diameter pin base portion 124b, and the shoulder portion 124c of the second pin-shaped mold 124 is The step portion 128 that is continuous with the hole portion 126 of the die holder 120 is held. Therefore, the second pin-shaped mold 124 has the second convex portion 124a, which is a press surface, formed with a diameter smaller than that of the pin base portion 124b. It becomes possible. And since only the 2nd convex-shaped part 124a is comprised by a small diameter, the fall of the intensity | strength of the 2nd pin-shaped metal mold | die 124 can be suppressed.

  Further, the first pin-shaped mold 104 is similarly formed with a projection 36a having a diameter as small as possible since the first convex portion 104a, which is a press surface, is configured to have a smaller diameter than the pin base portion 104b. It becomes possible. And since only the 1st convex-shaped part 104a is comprised by a small diameter, the fall of the intensity | strength of the 1st pin-shaped metal mold | die 104 can be suppressed.

  In addition, the tip portion of the first convex portion 104a is chamfered by, for example, electron beam machining. As a result, when the projection 36a is formed by the first pin-shaped mold 104, the first plate 24a is not buckled at a portion constricted by the projection 36a.

  Furthermore, the punch holder 102 is provided with a plurality of first through holes 108a and 108b for individually inserting the plurality of first pin-shaped dies 104, and the die holder 120 has a plurality of second pin-like shapes. A plurality of second through holes 130a and 130b for individually inserting the molds 124 are provided. Therefore, the first pin-shaped mold 104 is inserted into the first through holes 108a and 108b, while the second pin-shaped mold 124 is simply inserted into the second through holes 130a and 130b. As a result, the pressing process can be performed quickly.

  In addition, for example, when any of the first pin-shaped molds 104 is damaged, it is easy to replace the damaged first pin-shaped mold 104 with a new first pin-shaped mold 104. It can correspond to.

  Further, the first pin-shaped mold 104 and the second pin-shaped mold 124 have their end portions in contact with the first adjustment shim members 110a and 110b and the second adjustment shim members 132a and 132b, respectively, thereby adjusting the position in the axial direction. Is possible. For this reason, the height of the protrusion part 36a can be arbitrarily set only by changing the thickness of the first adjustment shim members 110a and 110b and the thickness of the second adjustment shim members 132a and 132b, respectively. Thereby, it becomes possible to cope with the design change of the protrusion 36a with a simple and economical configuration.

  Furthermore, a plurality of first and second pin-shaped dies 104, 124 disposed in the first processing portions 106a, 122a, and a plurality of first and second pin shapes disposed in the second processing portions 106b, 122b. The molds 104 and 124 are set at asymmetric positions. Accordingly, the first clamping portion 34a of the first plate 24a is formed with a plurality of projections 36a at the first processed portions 106a and 122a, and then the first plate 24a is inverted 180 degrees, and this first clamping portion 34a is reversed. The plurality of protrusions 36a are formed by disposing the portion 34a in the second processed portions 106b and 122b.

  At this time, the plurality of protrusions 36a formed by the first processing and the plurality of protrusions 36a formed by the second processing are not overlapped with each other. For this reason, with a simple configuration, the plurality of protrusions 36a can be densely formed in the first clamping portion 34a within a certain area.

  Furthermore, in the pressing method of the present invention, as described above, the plurality of protrusions 36a formed by the first processing portions 106a and 122a and the plurality of protrusions 36a formed by the second processing portions 106a and 122b are as follows. , Do not overlap each other. Thereby, it is possible to suppress the occurrence of springback and mold distortion in the first clamping part 34, and in a simple process, the first clamping part 34a has a plurality of protrusions 36a within a certain area. Can be formed precisely and with high accuracy.

  Further, the press forming of the plurality of protrusions 36a is performed near the yield point of the first plate 24a. Therefore, when the protrusion 36a is formed by applying permanent strain to the first plate 24a, the first plate 24a can be prevented from being damaged, and particularly, the thin plate-like first plate 24a can be prevented from being damaged.

  By the way, the first plate 24a press-molded by the press device 10 is transported to the next-stage punch molding device and subjected to perforating processing such as the fuel gas supply communication hole 28 and the fuel gas supply ports 40a and 40b.

  In addition, as a workpiece | work press-molded by the press apparatus 10, the metal separators 140 shown in FIG. 13 can be used, for example. The separator 140 has a fuel gas supply part 142 in which a fuel gas supply communication hole 28 is formed, and extends outward at an equal angular interval (90 degree interval) around the fuel gas supply part 142. The sandwiching portions 146 are integrally formed on the four bridge portions 144, respectively.

  Each clamping part 146 is provided with a plurality of protrusions 148 on the surface that contacts an electrolyte / electrode assembly (MEA) (not shown), and a fuel gas supply port 150 is provided at the center of the clamping part 146. It is formed. The separator 140 is configured substantially in the same manner as the first and second separators 14 a and 14 b constituting the fuel cell 12, and four MEAs are disposed between the separators 140.

  The separator 140 can perform press molding of the plurality of protrusions 148 by the press device 10. At that time, in the pressing device 10, the sandwiching portions 146 disposed at diagonal positions of the separator 140 are disposed in the first processing portions 106 a and 122 a and the second processing portions 106 b and 122 b, and Half of the protrusions 148 are press-molded.

  Next, the separator 140 is rotated 90 degrees around the vertical axis, and new clamping portions 146 are disposed in the first processing portions 106a and 122a and the second processing portions 106b and 122b. Half of the protrusions 148 are press-molded in the two new holding portions 146 via the first processed portions 106a and 122a and the second processed portions 106b and 122b.

  Furthermore, the separator 140 is turned 90 degrees around the vertical axis, and the sandwiched portion 146 in which half the protrusions 148 are formed by the first processing process is used as the first processing portions 106a and 122a and the second processing portions 106b and 122b. To place.

  At that time, the first processed portions 106a and 122a are provided with the holding portions 146 in which half the protrusions 148 are formed by the second processed portions 106b and 122b, while the second processed portions 106b and 122b include A sandwiching portion 146 in which half the protrusions 148 are formed by the first processed portions 106a and 122a is disposed. For this reason, the remaining half of the protrusions 148 are formed between the half of the protrusions 148 previously formed in the sandwiching part 146, and the desired number of the protrusions 148 is obtained.

  Next, the sandwiching portion 146 in which the separator 140 is inverted 90 degrees around the vertical axis and half the protrusions 148 are formed in advance is disposed in the first processing portions 106a and 122a and the second processing portions 106b and 122b. Thus, a desired number of the protrusions 148 are obtained in the sandwiching part 146 by the half of the protrusions 148 formed in advance and the new half of the protrusions 148 formed between the protrusions 148. .

  As described above, the separator 140 has four sandwiching portions 146, and the sandwiching portions 146 are sequentially arranged in the first processing portions 106a and 122a and the second processing portions 106b and 122b, respectively, and half the protrusions. By obtaining 148 by two-step press molding, a desired number of the protrusions 148 are molded. Therefore, the same effect as the separators 14a and 14b can be obtained.

DESCRIPTION OF SYMBOLS 10 ... Press apparatus 12 ... Fuel cell 14a, 14b, 140 ... Separator 24a, 24b, 26a, 26b ... Plate 34a, 34b, 72a, 72b, 74a, 74b, 146 ... Nipping part 36a, 36b, 56, 75a, 75b, 148 ... Projection 90 ... Lower mold 92 ... Upper mold 94 ... Punch plate 102 ... Punch holder 104, 124 ... Pin-shaped mold 104a, 124a ... Projection-shaped part 104b, 124b ... Pin base part
106 a, 106 b, 122 a, 122 b... Processed portions 108 a, 108 b, 130 a, 130 b... Through holes 110 a, 110 b, 132 a, 132 b ... adjustment shim members 114 ... die plate 120.

Claims (9)

A press device for forming a protrusion on a workpiece,
A first pin-shaped mold having a pin-shaped first convex portion corresponding to the shape of the protruding portion;
A second pin-shaped mold facing the first pin-shaped mold and having a pin-shaped second convex portion corresponding to the tip shape of the protrusion;
A convex mold in which the first pin-shaped mold is disposed so as to freely advance and retract;
The second pin-shaped mold is disposed so as to be movable back and forth, and the first pin-shaped mold enters the state in which the workpiece is sandwiched between the first and second pin-shaped molds. A concave mold for forming the protrusion on the workpiece;
A position adjusting member for adjusting the position of at least one of the first pin-shaped mold and the second pin-shaped mold in the axial direction;
A press apparatus comprising: The press apparatus according to claim 1, wherein the second pin-shaped mold has a pin base portion having a diameter larger than that of the second convex portion.
The concave mold has a hole corresponding to the outer diameter of the protrusion and providing a gap with the first convex part,
A step portion provided on an inner peripheral surface forming the hole portion, and a stepped shoulder portion between the second convex portion and the pin base portion is engaged;
The press apparatus characterized by having. 3. The press device according to claim 1, wherein the first pin-shaped mold has a pin base portion having a diameter larger than that of the first convex portion,
A pressing device, wherein a chamfering process is performed on an outer peripheral end surface of the first convex portion. 4. The press device according to claim 1, wherein the convex mold is provided with a plurality of first through holes for individually inserting the plurality of first pin-shaped molds. 5. With
The pressing apparatus, wherein the concave mold is provided with a plurality of second through holes for individually inserting the plurality of second pin-shaped molds. The press apparatus according to claim 4, wherein a first processing part that performs a first processing on the workpiece;
A second machining site for performing a second machining process on the workpiece subjected to the first machining process;
With
The plurality of first and second pin-shaped dies disposed at the first processing portion and the plurality of first and second pin-shaped dies disposed at the second processing portion are mutually A press apparatus characterized by being set at an asymmetric position.   The press apparatus according to any one of claims 1 to 5, wherein the position adjusting member is at least on an end portion of the first pin-shaped mold or the second pin-shaped mold on the side opposite to the workpiece. A pressing device, which is a shim member that abuts. A press method for sequentially arranging a workpiece at least at a first machining site and a second machining site, and forming a protrusion on the workpiece,
A convex mold in which a plurality of first pin-shaped molds having pin-shaped first convex portions corresponding to the shape of the protrusions are disposed in the first and second processed portions, and the first A concave mold in which a plurality of second pin-shaped molds having a pin-shaped second convex part corresponding to the tip shape of the protruding part are arranged opposite to the one-pin-shaped mold, and the first pin A position adjusting member for adjusting the position of at least one of the shaped mold and the second pin-shaped mold in the axial direction;
In the pressing method, the first pin-shaped mold is placed on the concave-side mold in a state where the work is disposed at the first processing site and the work is sandwiched between the plurality of first and second pin-shaped molds. Forming the protrusion on the workpiece by entering the mold; and
The first pin-shaped mold is placed on the concave side in a state where the work is disposed from the first processed site to the second processed site and the workpiece is sandwiched by a plurality of the first and second pin-shaped molds. Forming a new protrusion between the protrusions formed at the first machining site on the workpiece by entering the mold;
A pressing method characterized by comprising:   8. The pressing method according to claim 7, wherein the plurality of first and second pin-shaped dies disposed at the first processing portion and the plurality of first and first portions disposed at the second processing portion. A pressing method characterized in that the two-pin mold is set at asymmetric positions.   9. The press method according to claim 7, wherein the plurality of first pin-shaped dies and the concave-side dies perform press molding of the workpiece in the vicinity of exceeding the yield point of the workpiece. Press method to do.

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