JP2008087130A - Drilling device for porous carbon plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drilling device for a porous carbon plate, which inexpensively manufactures a porous carbon plate having through holes with different hole diameters while suppressing generation of cracks and dust. <P>SOLUTION: This drilling device for drilling through holes of desired diameters on a porous carbon plate by needles on a movable needle bed provided with a predetermined number of needles in a protruding manner includes: a cradle for the porous carbon plate having holes in the protruding positions of the needles on the needle bed, through which the needles on the needle bed enable to pass; a pressing plate for the porous carbon plate having holes through which the needles on the needle bed enable to pass, movably disposed in such a direction that the porous carbon plate is sandwiched between the needle bed and the cradle; and a suction device for sucking dust on the porous carbon plate which penetrates the needle holes of the cradle, provided on the cradle on the opposite side from the needle bed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a perforation apparatus for producing a porous carbon plate suitable for electrode materials, particularly gas diffusers, membrane-electrode assemblies, and fuel cells for polymer electrolyte fuel cells.

  Conventionally, as a material of a gas diffuser of a fuel cell electrode, a material using a porous carbon plate formed by binding carbon short fibers with carbon is known, and a solid using such a porous carbon plate is known. In the polymer fuel cell, in the power generation reaction in the high current density region, the water produced by the cathode catalyst cannot be efficiently discharged out of the system, and the oxygen necessary for the reaction is sufficiently supplied to the cathode catalyst due to the accumulated produced water. There was a problem that the battery could not be supplied and the output of the battery was reduced.

  In order to solve the above problems, a material obtained by subjecting a carbon fiber plate having a through hole in the thickness direction to a water repellent treatment has been proposed as a gas diffuser. (For example, refer to Patent Document 1). In this way, not only the through-holes in the carbon fiber plate are opened, but also the result that the output as a battery is improved by optimizing the pattern of the hole diameter and hole density (see, for example, Patent Document 2). .

  As a method for opening such a through-hole, a method of opening a through-hole with a sword or a needle punch has been proposed for a precursor base material that has been once cured by impregnating carbon fiber paper with a resin (for example, Patent Documents 3 and 4).

  However, when a through hole is made in the cured substrate, the strength of the substrate decreases and it is damaged in the next process, or the hole shape cannot be maintained until it becomes a product, and a dense and distributed pattern is formed. This makes it difficult to design through holes.

  In addition, as a method for directly opening a through hole in a porous carbon plate, a method using a sword mountain-shaped jig as used for ikebana is also common (see, for example, Patent Document 3). Moreover, it is also possible to apply a punching device or the like that opens a hole in a sheet-like object (for example, see Patent Document 5).

  However, when opening a through hole using such a needle ridge, it is necessary to prepare needle ridges with different needle diameters and needle densities with different needle densities in order to change the diameter of the through hole. There is a problem that workability of is bad.

  Furthermore, when drilling holes using a jig like a sword mountain, if a cradle is not used, the brittle porous carbon plate is fragile, and a cradle such as a cutter mat that does not penetrate the needle is used. In some cases, dust such as broken fibers or carbonized resin accumulates on the cutter mat each time a hole is made, and further, the voids and surfaces in the porous carbon plate and the dust in the through-holes remain attached. There is a concern, and it becomes very difficult to drill a large amount continuously.

  In addition, when a hole is made by directly passing a needle through a porous carbon plate containing carbon fiber, the needle is pulled out because the carbon fiber or carbonized resin temporarily spread when the needle penetrates holds the needle. When the porous carbon plate is lifted or forcibly pulled out, there is a problem that the porous carbon plate is brittle and the surrounding area is cracked or damaged.

  In addition, since many existing punching devices perform punching by pressing the end portion of the base material, there is a possibility that cracks may enter the periphery of the through-hole when being pulled out. In addition, there is a drawback that the hole diameter and hole density cannot be easily changed continuously.

Thus, in order to provide through holes having various through hole patterns in the porous carbon plate, it is necessary to solve the problem of dust removal during processing as well as workability.
JP-A-8-111226 JP 2004-30959 A Japanese Patent No. 2820492 JP 2005-38738 A JP-A-5-318448

  SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned problems and to produce a porous carbon plate having a variety of through-hole patterns that is inexpensive and efficiently produced with less generation of cracks and dust. Is to provide.

In order to solve the above problems, the present invention adopts the following configuration. That is,
(1) In a movable needle bed in which a predetermined number of needles are projected and a perforation device in which a through-hole of a desired diameter is drilled in a porous carbon plate by the needles of the needle bed, A porous carbon plate support having a hole through which the needle of the needle bed can penetrate, and a position in which the porous carbon plate is sandwiched between the needle bed and the support are arranged to be movable. A porous carbon plate presser plate having a hole through which the needle of the needle bed can pass, and a porous material that passes through the needle hole of the cradle provided on the opposite side of the cradle of the cradle A perforating apparatus for a porous carbon plate, comprising: suction means for sucking dust on the carbon plate.

  (2) The surface pressure applied to the porous carbon plate when the cradle and the presser plate sandwich the porous carbon plate is adjusted to be 0.001 to 1.2 MPa. The porous carbon plate perforating apparatus according to (1).

  (3) The perforating apparatus for a porous carbon plate according to (1) or (2), wherein a hole area a 'of the holding plate is smaller than a hole area a of the cradle.

  (4) The porous material according to any one of (1) to (3), wherein the diameter of the needle protruding from the needle bed increases from the tip toward the needle bed. Carbon plate punching device.

  According to the present invention, it is possible to produce a porous carbon plate having various through-hole patterns efficiently at low cost with less generation of cracks and dust.

  Next, the case of applying the example of the best embodiment of the present invention to a porous carbon plate perforating apparatus will be described with reference to the drawings.

  Fig.1 (a)-(f) is a cross-sectional conceptual diagram of the perforation apparatus concerning embodiment of this invention. 1 (a) to 1 (f) is a porous carbon plate which is a workpiece in the embodiment of the present invention, and includes a carbon plate formed by binding carbon fibers and carbonized resin, and carbon fibers. It can be applied to any form of paper, non-woven fabric, and woven fabric.

  As shown in FIG. 1 (a), the perforating apparatus includes a needle bed 1 in which a needle 5 for providing a through hole having a desired diameter is provided on the porous carbon plate A, and the porous carbon plate A. A movable presser plate 3 that can be fixed with the porous carbon plate A sandwiched between the cradle 2 and the cradle 2 is installed. Further, in order to allow the movable needle bed 1 to penetrate the porous carbon plate A, the cradle 2 and the presser plate 3 have a hole for penetrating the needle 5 at a position where the needle 5 of the needle bed 1 penetrates. Is provided. Furthermore, a suction means 4 for sucking dust generated when the porous carbon plate A is punched is provided on the side opposite to the needle bed 1 of the cradle 2. The porous carbon plate A can be intermittently transported between the support columns on the two sides in the front-rear direction of the cross-sectional view using an external driving device.

  As shown in FIGS. 1B and 1C, the movable needle bed 1 is attached to a needle bed support table that is supported by two side columns and is movable up and down, and the needle bed support table is moved up and down. The through-holes can be formed in the porous carbon plate A by sliding them in the direction.

  The movable needle bed 1 provided with a predetermined number of needles 5 is preferably about 2 to 20 per cm in a row in the direction (the needle bed support base direction) intersecting the transport direction of the porous carbon plate A. Needles are provided. Moreover, as shown in FIG.1 (d), the movable needle bed 1 has a function which slides a needle bed support stand in the direction (needle bed support stand direction) which cross | intersects the conveyance direction of the porous carbon plate A. As shown in FIG. A through hole that is an integral multiple of the number of needles 5 of the movable needle bed 1 can be formed per row. Further, it is possible to shorten the perforation time by increasing the number of needle rows per needle bed 1.

  The material of the needle 5 is not limited as long as the friction with the porous carbon plate A is small, the porous carbon plate A can be penetrated with a light shearing force, and the hardness is high. For example, iron, stainless steel, plastic, ceramics and the like can be mentioned, and a needle made of stainless steel is more preferable.

  The through-hole having a desired diameter drilled in the porous carbon plate A is preferably 0.05 to 3 mm. In order to obtain a through-hole having such a hole diameter, the maximum diameter of the needle 5 of the needle bed 1 is The thing of 0.05-3 mm is good to use.

  The cradle 2 having a hole through which the needle 5 of the needle bed 1 can penetrate has a hole of area a at a position corresponding to a position through which the needle 5 penetrates so that the needle 5 can penetrate the cradle 2. When the needle 5 of the needle bed 1 pierces the porous carbon plate A, the needle tip penetrates the hole of the cradle 2 so that the generated porous carbon plate dust remains on the cradle 2. Can be difficult.

  Although the area a of the hole of the cradle 2 depends on the needle diameter of the needle 5, the maximum diameter is preferably 0.2 to 6 mm. If the diameter of the needle bed 1 is too large, the surface that supports the porous carbon plate A during drilling becomes small, so that cracks are likely to enter the periphery of the through hole, while the area a of the hole in the cradle 2 is too small. Since dust tends to remain on the cradle 2 and adhere to the porous carbon plate A, the diameter of the hole of the cradle 2 is smaller than the diameter of the through-hole drilled in the porous carbon plate A. , 0.15 to 3 mm is preferable.

  The material of the cradle 2 is not limited as long as the porous carbon plate A is slid on the cradle 2 so as not to be scratched or generate fluff. Moreover, it is preferable that the thickness is such that the cradle 2 is not bent by the impact at the time of drilling and the porous carbon plate A is damaged.

  A porous body having a hole through which the needle 5 of the needle bed 1 is pierced and arranged so as to be movable between the needle bed 1 and the cradle 2 so as to sandwich the cradle 2 and the porous carbon plate A. The press plate 3 of the carbon plate A is provided with a hole so that the needle 5 can pass therethrough. In addition, the presser plate 3 is supported on two sides by struts, and can be moved up and down by a driving device. The porous carbon plate A is sandwiched between the cradle 2 and a surface other than the through hole (the through hole is formed). The pressure applied to the non-existing surface) can be adjusted. After the needle 5 of the needle bed 1 is completely pulled out from the porous carbon plate A, the presser plate 3 can be slid in the direction of the needle bed 1 to release the porous carbon plate A.

  The material of the presser plate 3 may be a material that generates friction, but is preferably a material that does not cause dust adhesion. Moreover, in order to improve the suction force of the dust generated around the through hole of the porous carbon plate A, it is preferable that the material of the presser plate 3 does not allow gas to pass. For example, stainless steel, glass, plastic and the like can be mentioned, and a stainless steel plate is more preferable.

  The suction means 4 is a device that suctions by reducing the atmosphere with a pump or the like, and is installed on the side opposite to the needle bed 1 of the cradle 2, and after the needle 5 has penetrated the porous carbon plate A. It has a function of sucking and removing the generated dust from the side opposite to the needle bed 1.

  The surface pressure applied to the porous carbon plate A when the cradle 2 and the presser plate 3 sandwich the porous carbon plate A is the surface other than the through hole of the cradle 2 and the presser plate (there is no through hole). Surface) is a surface pressure applied when sandwiching the porous carbon plate A, and if the surface pressure is too high, the substrate may be broken, and if the surface pressure is too low, the needle 5 will lose the pulling force, The porous carbon plate A may be cracked or damaged. The surface pressure for sandwiching the porous carbon plate A is preferably in the range of 0.001 to 1.2 MPa, and more preferably adjusted according to the characteristics of the porous carbon plate A. The surface pressure can be measured by sandwiching a pressure sensitive paper capable of detecting a predetermined pressure instead of the porous carbon plate A.

  Further, in order to improve the suction efficiency of dust in the through hole, the suction efficiency of dust in the through hole portion is selectively improved as the hole area a ′ for penetrating the needle in the presser plate 3 is smaller. By making the hole area a ′ of the holding plate 3 smaller than the hole area a of the cradle 2, dust in the through-hole portion can be removed, and the remaining on the cradle 2 can be minimized. The minimum area of the hole area a ′ is preferably an area that does not hinder the sliding of the needle 5 and is larger by about 0.10 to 3 mm than the diameter of the through hole formed in the porous carbon plate A. Is preferred.

  In order to change the type of the hole diameter of the through hole formed in the porous carbon plate A, it is preferable that the diameter of the needle shape increases from the tip toward the needle bed 1 like a conical shape. . When drilling using such a needle bed 1 provided with a protruding needle 5, as shown in FIGS. 1 (e) and 1 (f), even if the same needle bed 1 is used, the penetration depth is changed. The pore diameter of the porous carbon plate A can be changed. The present invention uses a perforating apparatus for a porous carbon plate having the above-described function, and thus can provide a porous carbon plate that has no through dust and that has through holes with different pore diameters at low cost and efficiency. Become.

(A)-(f) is a schematic sectional drawing which shows an example of the perforation apparatus for porous carbon plates of this invention.

Explanation of symbols

A: porous carbon plate 1: needle bed 2: cradle 3: presser plate 4: suction means 5: needle

Claims (4)

In a movable needle bed in which a predetermined number of needles are projected, and a perforation device that drills a through-hole of a desired diameter in a porous carbon plate with the needles of the needle bed, the needle bed has a needle projecting position. A pedestal of a porous carbon plate having a hole through which the needle of the needle bed can penetrate, and the needle disposed so as to be movable in a direction to sandwich the porous carbon plate between the needle bed and the pedestal A holding plate of a porous carbon plate having a hole through which a needle on the floor can pass, and a porous carbon plate that is provided on the opposite side of the receiving bed from the needle bed of the receiving table and passes through the needle hole of the receiving table. A perforating apparatus for a porous carbon plate, comprising a suction means for sucking dust. The contact pressure applied to the porous carbon plate when the cradle and the presser plate sandwich the porous carbon plate is adjusted to be 0.001 to 1.2 MPa. 2. A perforating apparatus for a porous carbon plate according to 1. The perforating apparatus for a porous carbon plate according to claim 1, wherein a hole area a ′ of the presser plate is smaller than a hole area a of the cradle. The perforating apparatus for a porous carbon plate according to any one of claims 1 to 3, wherein the diameter of the needle protruding from the needle bed increases from the tip toward the needle bed.

Images