JP2007283308A - Reducing roll - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide reducing rolls with which a target rugged pattern is stably obtained without round edges in the rugged shape of a product sheet and cracks caused by positional deviation in the rotational direction of a roll and the axial direction of the roll in a pair of upper and lower reducing rolls on which the rugged pattern is applied to the middle part. <P>SOLUTION: In the pair of the upper and lower reducing rolls which have a flat part in the periphery and to the part except for the periphery of which the rugged pattern 11 is applied, a recessed and projection part 12 is provided to both end parts of the upper and lower reducing rolls respectively over the entire circumference. In these reducing rolls, the clearances 31 between a recessed part and a projecting part in the axial direction of the rugged pattern and in the direction perpendicular to the axial line are larger than the clearances 32 between the recessed part and the projection part in the axial direction of the recessed and projection part 12 and in the direction perpendicular to the axial line, and a pitch (p) in the rotational direction of the roll of the recessed and projection part 12 is integer number times the pitch (P) in the rotational direction of the roll of the rugged pattern 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pair of upper and lower reduction rolls having a concavo-convex pattern at the center of the surface, and relates to a technique for transferring a concavo-convex pattern onto a metal plate by inserting a metal plate between the reduction rolls of the present invention. Is.

  Conventionally, there are those in which an uneven pattern is transferred and formed on a metal plate and used as a functional member, such as a separator for a fuel cell, a heat transfer plate for a heat exchanger, a building material for an anti-slip floor, and a building material for an outer wall. Since these members satisfy a predetermined function, it is necessary to provide a fine uneven pattern on the members. For example, a separator for a polymer electrolyte fuel cell forms a laminated structure with a fuel electrode and a polymer electrolyte membrane, and the uneven pattern of the separator serves as a channel for supplying hydrogen and air (oxygen) to the polymer electrolyte membrane. Therefore, it is necessary to have a fine uneven pattern to ensure compact and high power generation and energization performance. Further, in order to ensure high heat transfer performance also in the heat transfer plate of the heat exchanger, it is necessary to make the uneven pattern serving as the flow path of the refrigerant gas into a fine shape. As a processing apparatus for forming such a fine concavo-convex pattern, a press molding apparatus using a convex mold and a concave mold is widely known. However, the method of forming a fine concavo-convex pattern by press molding is produced because the pressing surface becomes flat and wide when the member is large, so the molding load increases, large equipment is required, and it is a batch operation. Inefficient.

  Therefore, in consideration of the above problems, there is a processing device that rotates a pair of upper and lower rolling rolls having a concavo-convex pattern on the surface, inserts a metal plate between the rolling rolls, and transfers the concavo-convex pattern onto the metal plate. It is disclosed in Patent Document 1 and Patent Document 2. By using this processing device, the molding load is reduced, the equipment becomes compact compared to the press molding device, and since it is a continuous molding, a processing device suitable for mass production can be provided. In roll forming, it is important to accurately align the rotation direction of the upper and lower rolls and the roll axis direction. Normally, the upper and lower rolls in the rotation direction are synchronized by means of synchronous drive means using gears as shown in FIG. , Driving means for electrically synchronous control is used. However, when forming a fine concavo-convex pattern, unevenness of the concavo-convex parts of the upper and lower rolling rolls occurs due to the amount of play of gears, poor synchronization control, and the amount of swing of the drive bearing, and the target concavo-convex pattern cannot be obtained. , There is a problem of uneven sagging and cracking.

  Japanese Patent Application Laid-Open No. 2004-228561 discloses an apparatus for sandwiching a material between each roll by driving a convex roll and a concave roll from gears linked to respective rotary shafts in order to emboss the outer surface of the can body. However, when forming a fine concavo-convex pattern, positional deviation occurs in the roll rotation direction and roll axis direction due to the play amount of the gear and the swing amount of the drive bearing, and the desired concavo-convex pattern cannot be obtained. There are problems of sagging and cracking.

  In Patent Document 4, an opposing roll consisting of a rod-shaped upper mold roll with a number of punches projecting on the peripheral surface and a bar-shaped lower mold roll with a number of punches projecting on the peripheral surface is rotated between the two rolls. Detection to detect the rotation angle of the upper and lower rolls in order to reduce the deviation of the rotation angle of the roll and the bending deformation of the roller in the uneven metal plate molding machine that presses and feeds the flat metal plate and forms it. , A molding machine comprising a synchronous control means for controlling the upper and lower drive mechanisms so that all rolls rotate synchronously based on the detection results of these detection means, and a bearing member for holding the non-press-molding portion of each opposing roll Is disclosed. However, when forming a fine concavo-convex pattern, misalignment occurs in the roll rotation direction and roll axis direction due to errors and malfunctions of the rotation angle detection sensor and the amount of drive bearing deflection, and the desired concavo-convex pattern is obtained. However, there is a problem in that the concave and convex shapes and cracks occur.

  In addition, in Patent Document 5, the inventors of the separator manufacturing apparatus for a polymer electrolyte fuel cell have a flat portion around the periphery, and a portion excluding the periphery has a convex portion and a concave portion that serve as a gas flow path. A separator for a polymer electrolyte fuel cell having a pair of upper and lower rolling rolls having at least one set of concavo-convex portions at a position facing the front and opposite to a processed surface having a concavo-convex shape similar to the shape of the convex and concave portions of the separator A manufacturing apparatus has been disclosed. The purpose of this device is to protect the processed surface that has been processed with irregularities that are similar to the shape of the convex and concave parts of the separator. This is an invention that has the effect of avoiding breakage of the upper and lower rolling rolls due to misalignment or mold squeezing before starting the forming process. However, since the concavo-convex part is arranged only in front of the processed surface with the concavo-convex process, the positional deviation in the roll rotation direction and roll axis direction is caused by the play amount of the gear and the run-out amount of the drive bearing generated during the forming process. If this occurs, the positional deviation in the roll rotation direction cannot be resolved, and the shape of the projections and recesses of the separator cannot be obtained as intended, and the problem of sagging unevenness and cracking remains.

JP 2002-190305 A JP-A-62-45438 JP 2000-343153 A JP 2005-254277 A Japanese Patent Laid-Open No. 2004-139861

  As described above, in a processing apparatus that rotates a pair of upper and lower rolling rolls having a concavo-convex pattern on the surface at the center and inserts a metal plate between the rolling rolls, In technology, when misalignment occurs in the roll rotation direction and roll axis direction during molding, the uneven pattern as the target cannot be obtained due to the mismatch of the upper and lower uneven parts, and the uneven shape of the uneven pattern and cracks occur. is there.

  The present invention is intended for a molding apparatus that can prevent the unevenness and cracks of the uneven pattern due to the positional deviation in the roll rotation direction and roll axis direction that occur during molding, and can stably obtain the target uneven pattern. An object is to provide a reduction roll.

In order to solve the above problems, the gist of the present invention is as follows:
(1) In a pair of upper and lower rolling rolls having a flat portion on the periphery and having a concavo-convex pattern 11 on the portion other than the periphery, the concavo-convex portions 12 are provided on both ends of each of the upper and lower rolling rolls, The gap 31 between the concave portion and the convex portion in the axis direction of the pattern 11 and the direction perpendicular to the axis is larger than the gap 32 between the concave portion and the convex portion in the axis direction of the concave and convex portion 12 and in the direction perpendicular to the axis. A rolling roll characterized in that the pitch (p) in the direction is an integral multiple of the pitch (P) in the roll rotation direction of the concavo-convex pattern.

(2) Further, the gap 35 between the concave and convex rolls between the vertical pressing rolls of the concave / convex pattern 11 is smaller than the gap 36 between the concave and convex rolls between the vertical rolling rolls of the concave / convex part 12 (1) ) The rolling roll described.

(3) The rolling roll according to (1), wherein the height h of the convex portion of the concavo-convex portion 12 is greater than the height (H) of the convex portion of the concavo-convex pattern 11.

(4) The rolling roll according to (1), wherein the pitch (p) in the roll rotation direction of the concavo-convex portion 12 is the same as the pitch (P) in the roll rotation direction of the concavo-convex pattern 11.

  According to the present invention, when a functional member having a fine concavo-convex pattern formed on a metal plate is formed with high accuracy, the uneven shape of the concavo-convex pattern caused by misalignment in the roll rotation direction and roll axis direction that occurs during forming is formed. It is extremely effective as a technology that can prevent cracking and efficiently mass-produce its functional members at low cost.

Details of the present invention will be described below.
The inventors of the present invention have provided a concavo-convex portion on the entire circumference of both ends of a pair of upper and lower rolling rolls, and the gap between the concave and convex portions in the axial direction of the concavo-convex pattern applied to the central portion of the roll and in the direction perpendicular to the axis. Is larger than the gap between the concave and convex portions in the axial direction of the concave and convex portions provided at both ends of the roll and in the direction perpendicular to the axial line, the both ends of the roll can be detected even if misalignment occurs in the roll rotational direction and roll axial direction. It was discovered that the concave and convex portions of the concave and convex portions of the concave and convex portions can be avoided by avoiding inconsistencies between the upper and lower concave and convex patterns caused by the positional deviation of the upper and lower rolls. Therefore, as a result of making various types of rolling rolls and examining the uneven shape of the uneven portions formed at both ends of the rolling roll, we have invented a rolling roll that can stably form the target uneven pattern.

  2 and 3 show examples of functional members formed and processed by the reduction roll according to the present invention. FIG. 2 shows an example of the shape of a separator for a polymer electrolyte fuel cell. An uneven pattern 11 having an uneven cross-sectional shape is formed, and the uneven pattern 11 of the separator is a flow path of hydrogen or air (oxygen). FIG. 3 shows an example of the shape of the heat transfer plate of the heat exchanger. As in the case of the separator, a concavo-convex pattern 11 having a concavo-convex repetitive cross-sectional shape is formed. It is a flow path.

  FIG. 4 shows an example of a pair of upper and lower reduction rolls 41 in a roll rotary processing apparatus that continuously manufactures these functional members. The pair of upper and lower rolling rolls 41 are driven synchronously, the concave / convex pattern 11 is provided at the center of the roll, and the concave / convex part 12 is provided on the entire circumference of both ends of the roll.

  5A and 5B are a plan view and a side view of the rolling roll 41 according to the present invention, in which a concavo-convex pattern 11 having a shape similar to a functional member shape is formed at the center, and a cylindrical concavo-convex portion 12 is formed around the entire circumference of both ends. Arranged in the direction of rotation. In order to prevent the shape of the concavo-convex portion 12 from being transferred to the metal plate 21, the concavo-convex portions 12 at both ends are disposed outside the region through which the metal plate 21 for forming a functional member is passed. The reduction roll 41 has a flat portion along the curved surface of the roll on the periphery, and a portion other than the periphery, that is, a part of the central portion is provided with an uneven pattern 11, and unevenness is formed on both ends of the upper and lower reduction rolls. Part 12 is formed.

  FIG. 6 is a sectional view and an enlarged view of the concavo-convex pattern 11 applied to the central portion of the rolling roll 41. FIG. 7 shows cylindrical concavo-convex portions 12 arranged around the entire circumference of the roll end portion, and the shoulder portions of the concave portion 13 and the convex portion 14 are chamfered in an R shape or the like.

  The gap 31 between the concave portion 13 ′ and the convex portion 14 ′ in the axial direction of the concave / convex pattern 11 shown in FIG. 6 and the direction perpendicular to the axial line ((width of concave portion−width of convex portion) ÷ 2) is the concave / convex portion 12 shown in FIG. It is necessary to make it larger than the gap 32 between the concave portion 13 and the convex portion 14 in the axial direction and the direction perpendicular to the axial line. This is because when the uneven pattern 11 is transferred and formed on the metal plate 21, when the positional deviation in the roll rotation direction and the roll axis direction occurs, the uneven parts 12 positioned at both ends of the rolling roll mesh with each other, thereby This is because it is possible to avoid inconsistencies between the concave and convex portions between the rolls in advance, and to prevent the concave and convex shapes and cracks of the concave and convex pattern 11 on the metal plate. In the present invention, the “axial direction” of the concavo-convex pattern is defined as a direction parallel to the flow path of the concavo-convex pattern (thick arrow 20 shown in FIGS. 2 and 3).

  The pitch (p) in the roll rotation direction of the concavo-convex portion 12 shown in FIG. 7 is matched with the processing timing of the concavo-convex pattern 11 to ensure that the concave portion 13 ′ and the convex portion 14 ′ do not match between the upper and lower rolls of the concavo-convex pattern 11. In order to avoid this, it is preferable that the pitch is equal to the pitch (P) of the concavo-convex pattern 11 shown in FIG. 6 or an integral multiple of the pitch (P).

  Further, in order to avoid the inconsistency of the concave portion 13 ′ and the convex portion 14 ′ between the upper and lower rolls of the concave and convex pattern 11, the concave and convex portion 12 meshes prior to the concave portion 13 ′ and convex portion 14 ′ of the concave and convex pattern 11. The height (h) of the convex portion 14 of the concave / convex portion 12 shown is preferably larger than the height (H) of the convex portion 14 ′ of the concave / convex pattern 11 shown in FIG.

  In the case of using a functional member obtained by transferring a concavo-convex pattern on a metal plate as a fuel cell separator, it is necessary to make the top 15 of the convex portion as flat as possible to increase the contact area with the fuel electrode in order to increase the energization efficiency. In addition, when a functional member obtained by transferring and forming a concavo-convex pattern on a metal plate is used as a heat transfer plate for a heat exchanger, the top 15 of the convex portion is made as flat as possible in order to securely adhere the heat transfer plate and to stack efficiently. It is desirable. Accordingly, in order to reliably compress and mold the convex metal plate by the roll rotary processing apparatus and to flatten the top 15 of the convex portion, the tip of the convex portion 14 ′ of the concavo-convex pattern 11 is recessed through the metal plate. Before contacting the bottom portion of 13 ′, it is preferable to avoid the uneven portion 12 installed at the end of the roll from bottoming out first (the tip of the convex portion 14 contacts the bottom portion of the concave portion 13). It is preferable that the gap 35 between the concave and convex portions 13 'and the convex portion 14' shown in Fig. 7 is smaller than the gap 36 between the concave and convex portions 13 and the convex portion 14 shown in Fig. 7. .

  However, in the concavo-convex portion 12 of FIG. 7, the bottom of the concave portion 13 may be spherical in addition to the plane, and the tip of the convex portion 14 may be spherical in addition to the plane. Further, as shown in FIG. 7D, it is needless to say that the effect of the present invention can be obtained even if the cross-sectional shape of the concavo-convex portion 12 is a quadrangular cross-section with rounded corners.

  As an example, a polymer electrolyte fuel cell separator was formed by a roll rotary processing apparatus. The material of the reduction roll is mold tool steel SKD11, and the metal plate 21 uses a coil of austenitic stainless steel SUS316 with a plate width of 250 mm and a plate thickness of 0.1 mm, and continuously supplies the stainless steel plate to a roll rotary processing device. did. As shown in FIG. 2, the shape of the separator is 150 mm (X1) in length and 200 mm (Y1) in width, the depth of the channel is 0.5 mm, and the width of the channel is 0.6 mm. is there. As for the rolling roll, the concave and convex pattern 11 and the concave and convex portions 12 are formed on the surfaces of a pair of upper and lower rolling rolls having a diameter of 250 mm and a barrel length of 300 mm by grinding, and the size of the concave and convex pattern 11 is the length (arc length). ) The concave and convex portion 12 is 150 mm wide and 200 mm wide, and is formed over the entire circumference in the roll rotation direction. As shown in FIG. 6, the cross-sectional shape of the convex portion in the direction perpendicular to the axis of the concavo-convex pattern 11 is a convex shape having a curvature radius (R) of 0.3 mm, the height (H) is 0.5 mm, and the width (W1). The recess cross-sectional shape is 0.6 mm, and the width (W2) is 0.9 mm. The gap 31 between the concave portion 13 ′ and the convex portion 14 ′ ((width of the concave portion W 2 −width W 1 of the convex portion) ÷ 2) in the direction of the axis of the concavo-convex pattern 11 and the direction perpendicular to the axis is 0.15 mm.

  On the other hand, as shown in FIG. 7, the convex portions 14 of the concave and convex portions 12 formed at both ends of the rolling roll have a cylindrical shape with a height (h) of 0.6 mm and a diameter of 0.8 mm, and the shoulder portions have a curvature. Chamfered with a radius (R) of 0.3 mm, and a circular flat portion having a diameter of 0.2 mm is formed at the tip of the convex portion 14. The concave portion 13 of the concave and convex portion 12 has a cylindrical shape with a depth (d) of 0.8 mm and a diameter of 0.9 mm.

  The gap 32 between the concave portion 13 and the convex portion 14 ((the width w3 of the concave portion−the width w4 of the convex portion) ÷ 2) in the axial direction of the concave and convex portion 12 and the direction perpendicular to the axial line is 0.05 mm. 11 is set so that the gap 31 between the concave portion 13 ′ and the convex portion 14 ′ is 0.1 mm larger than the gap 32.

  The depth (d) of the concave portion 13 is 0.2 mm larger than the height (h) of the convex portion 14 as described above, and the concave portion 13 ′ and the convex portion 14 ′ between the upper and lower rolling rolls of the concave and convex pattern 11. The gap 35 is set to be 0.2 mm smaller than the gap between the concave portion 13 and the convex portion 14 between the upper and lower rolls of the concave and convex portion 12.

  For the driving of the vertical rolling roll, a synchronous drive means using gears was provided, and a JIS 6 grade ball bearing was adopted for the rolling roll bearing. After aligning the rotational direction and axial direction of the vertical rolling roll, a coiled stainless steel plate was continuously supplied to the roll-rotating processing device, and a polymer electrolyte fuel cell separator was prototyped. As a result, it was possible to mold without any sag or crack in the uneven pattern portion of the separator. After performing appropriate surface treatment and the like, the fuel cell stack 70 shown in FIG. 8 was constructed and performance tests were conducted. As a result, no gas leakage or water leakage occurred, and the fuel cell using the separator according to the manufacturing method of the present invention was used. As well as functioning well.

  As a next example, a heat exchanger plate for heat exchanger was formed by a roll rotary processing device. The material of the reduction roll was mold tool steel SKD11, and the metal plate was a coil of austenitic stainless steel SUS304 with a plate width of 200 mm and a plate thickness of 0.2 mm, and the stainless steel plate was continuously supplied to the roll rotary processing device. . As shown in FIG. 3, the shape of the heat transfer plate is 400 mm (X2) in length and 200 mm (Y2) in width, the depth of the flow path is 0.8 mm, and the width of the flow path is 0.2 mm. 8 mm. As for the rolling roll, the concave / convex pattern 11 and the concave / convex portion 12 are formed by grinding on the surface of a pair of upper and lower rolling rolls having a diameter of 350 mm and a barrel length of 300 mm. ) The concavo-convex portion 12 has a width of 400 mm and a width of 200 mm, and is formed over the entire circumference of the roll rotation direction.

  As shown in FIG. 6, the convex section sectional shape in the direction perpendicular to the axis of the concave-convex pattern 11 is a convex shape having a curvature radius (R) of 0.4 mm, the height (H) is 0.8 mm, and the width (W1 ) Is 0.8 mm, and for the cross-sectional shape of the recess, the width (W2) is 1.4 mm. The gap 31 between the concave portion 13 ′ and the convex portion 14 ′ ((the width W1 of the concave portion−the width W1 of the convex portion) ÷ 2) in the axial direction of the concave / convex pattern 11 and the direction perpendicular to the axial line is 0.3 mm.

  On the other hand, as shown in FIG. 7, the height (h) of the projections 14 of the projections and depressions 12 formed at both ends of the rolling roll has a cylindrical shape of 0.9 mm and a diameter of 1.2 mm, and the shoulder has a curvature. Chamfered with a radius (R) of 0.4 mm, and a circular flat portion with a diameter of 0.4 mm is formed at the tip of the convex portion 14. The concave portion 13 of the concave-convex portion 12 has a cylindrical shape with a depth of 1.0 mm and a diameter of 1.4 mm, and the shoulder portion is chamfered with a curvature radius (R) of 0.4 mm.

  The gap 32 between the concave portion 13 and the convex portion 14 ((the width w3 of the concave portion−the width w3 of the convex portion) ÷ 2) in the axial direction of the concave and convex portion 12 and the direction perpendicular to the axial line is 0.1 mm. The gap 31 between the concave portion 13 and the convex portion 14 between the rolling rolls was set to be 0.2 mm larger than the gap 32.

  The depth (d) of the concave portion 13 is 0.1 mm larger than the height (h) of the convex portion 14 as described above, and the concave portion 13 ′ and the convex portion 14 ′ between the upper and lower rolls of the concave and convex pattern 11. The gap 35 was set to be 0.1 mm smaller than the gap 36 between the concave portion 13 and the convex portion 14 between the rolling rolls of the concave and convex portion 12.

  Regarding the driving of the vertical rolling roll, it is driven by the same means as in Example 1, and after aligning the phase and axial direction of the vertical rolling roll, continuously feeding the coiled stainless steel plate to the roll rotary processing device. A heat transfer plate was prototyped. As a result, the heat transfer plate could be molded without any sag and cracks in the uneven pattern. After that, as shown in FIG. 9, a heat exchanger was fabricated and performance tests were performed. As a result, water leakage did not occur and a predetermined heat transfer efficiency could be ensured.

  The present invention is useful, for example, in the field of manufacturing a polymer electrolyte fuel cell separator in which an uneven pattern is transferred and formed on a metal plate.

It is a schematic diagram of the synchronous drive means of the reduction roll in a roll rotary processing apparatus. (A) It is a top view of a polymer electrolyte fuel cell separator. (B) It is sectional drawing in A of said (a). (A) It is a top view of the heat exchanger plate for heat exchangers. (B) It is sectional drawing in B of said (a). It is a schematic diagram of the rolling roll concerning this invention. (A) It is a top view of the reduction roll concerning this invention. (B) It is a side view of the reduction roll concerning this invention. (A) It is sectional drawing of the uneven | corrugated pattern part given to the reduction roll concerning this invention. (B) It is an enlarged view of sectional drawing of an uneven pattern. (A) It is a top view of the cylindrical convex part arranged in the perimeter of a roll rotation direction. (B) It is sectional drawing of an uneven | corrugated | grooved part, and sectional drawing of B. (C) It is a top view of a recessed part. (D) It is an example of the B cross section of an uneven | corrugated | grooved part. It is a schematic diagram of a polymer electrolyte fuel cell (fuel cell stack). It is a schematic diagram of a heat exchanger.

Explanation of symbols

11: concavo-convex pattern 12: concavo-convex portion 13, 13 ': concave portion 14, 14': convex portion 15: top of convex portion 20: axial direction 21: metal plate 31: concave portion and convex portion of concave-convex pattern 11 of the rolling roll Gap 32: Gap 35 between the concave and convex portions 12 in the concavo-convex portion 12: Gap between the concave and convex portions 11 in the concave-convex pattern 11 of the rolling roll 36: Gap 41 in the vertical direction between the concave and convex portions 12 in the concave and convex portion 12: Crushing roll 51: Gear 61: Channel depth 62: Channel width 70: Polymer electrolyte fuel cell 71: Hot water flow direction 72: Cold water flow direction

Claims (4)

In a pair of upper and lower rolling rolls having a flat portion at the periphery and having a concavo-convex pattern 11 on the portion other than the periphery, concavo-convex portions 12 are provided on both ends of the upper and lower rolling rolls, respectively. The gap 31 between the concave and convex portions in the axial direction and the direction perpendicular to the axis is larger than the gap 32 between the concave and convex portions in the axial direction and the direction perpendicular to the axial line, and the pitch of the concave and convex portions 12 in the roll rotation direction ( A rolling roll, wherein p) is an integral multiple of the pitch (P) of the concavo-convex pattern 11 in the roll rotation direction. 2. The gap 35 between the concave and convex portions between the upper and lower rolling rolls of the concave and convex pattern 11 is smaller than the gap 36 between the concave and convex portions between the vertical rolling rolls of the concave and convex portion 12. Rolling roll. 2. The reduction roll according to claim 1, wherein the height (h) of the convex portion of the concave and convex portion 12 is greater than the height (H) of the convex portion of the concave and convex pattern 11. Furthermore, the roll (P) of the uneven | corrugated | grooved part 12 in the roll rotation direction is the same as the pitch (P) of the roll rotation direction of the uneven | corrugated pattern 11, The reduction roll of Claim 1 characterized by the above-mentioned.

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