JP2013044358A - Flange joint and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provided a flange joint having strength high enough to withstand high pressure, and a method of manufacturing the same.SOLUTION: A first reinforcing member 33 is positioned along a peripheral surface of a columnar part 21c of a female mold 21, and a cut line-formed part is bent and positioned along a flat surface 21a of the female mold 21. Thus, the cut line-formed part of the first reinforcing member 33 assumes a shape which comprises triangular gap parts G formed between a plurality of rectangular flange part reinforcing parts 33b and adjacent rectangular flange part reinforcing parts 33b. Subsequently, second reinforcing members 34A and 34B, which assume a trapezoidal shape comprising the flange part reinforcing parts 33b and the triangular gap parts G on both sides thereof, are arranged in such a manner that triangular parts 34b of the second reinforcing members 34A and 34B adjacent to each other overlap each other.

Description

  TECHNICAL FIELD The present invention relates to a flange joint and a method for manufacturing the same, and in particular, a flange joint suitable for use in joining a multilayer pipe composed of a hard vinyl chloride resin pipe whose outer peripheral surface is reinforced with a glass fiber reinforced resin (FRP) layer. And a manufacturing method thereof.

  It is known that a filling type adhesive is used for bonding a multilayer pipe made of a hard vinyl chloride resin pipe whose outer peripheral surface is reinforced with a glass fiber reinforced resin layer (Patent Document 1).

  In the bonding of Patent Document 1, when the glass fiber reinforced resin tube is peeled off from the multilayer tube, a saw is used with care not to cut between the hard vinyl chloride in the glass fiber reinforced resin layer in the multilayer tube. A complicated work process is required, for example, after cutting with a burner or the like and heating the portion to be peeled off with a burner or the like, and then peeling off the glass fiber reinforced resin layer with pliers or the like. In particular, in a multi-layer pipe used as a high-pressure pipe, the glass fiber reinforced resin layer is provided with a very large thickness, which makes the stripping operation more difficult.

JP 2003-207087 A

  A flange joint structure is known as a joint that does not require the stripping process of the glass fiber reinforced resin layer. However, the flange joint used for joining the multilayer pipes has sufficient strength to withstand high pressure. Such flange joints have not been known in the past.

  An object of the present invention is to provide a flange joint having a sufficient strength that can withstand high pressure and a method for manufacturing the flange joint. .

  A flange joint according to the present invention is a flange joint having a cylindrical portion and a flange portion, and is a glass fiber reinforced resin integrated product in which a glass base material for reinforcing the cylindrical portion and the flange portion is disposed. The base material includes a plurality of cylindrical portion forming layers that form cylindrical portions, a plurality of flange portion forming layers that are connected to each cylindrical portion forming layer to form flange portions, and a plurality of flange portion reinforcements that are overlapped between the flange portion forming layers. Each flange portion forming layer has a triangular gap between adjacent reinforcing portions of the square flange portion, and the flange portion reinforcing pieces are formed on the flange reinforcing portion and on both sides thereof. The trapezoidal shape is a combination of the gap portions, and the triangular portions of the adjacent flange portion reinforcing pieces are arranged so as to overlap each other.

  Conventionally, when joining a multilayer pipe made of a hard vinyl chloride resin pipe whose outer peripheral surface is reinforced with a glass fiber reinforced resin layer, a method of peeling off the glass fiber reinforced resin layer and using a filling adhesive has been adopted. However, by using this flange joint, it is possible to perform a coupling (flange joint structure) that does not require the step of stripping the glass fiber reinforced resin layer. According to the flange joint of the present invention, the flange portion forming layer of the glass base material is connected to the cylindrical portion forming layer, whereby the strength of the boundary portion between the flange portion and the cylindrical portion is increased, and the flange portion reinforcing piece Are arranged so that the triangular portions of adjacent ones overlap each other, so that the flange portion is thick and reinforced with a sufficient amount of glass base material and has sufficient strength to withstand high pressure It becomes.

  According to the flange joint manufacturing method of the present invention, a glass fiber reinforced resin integrated flange joint having a cylindrical portion and a flange portion is formed on a lower mold in which a columnar portion forming an inner peripheral surface of the cylindrical portion is formed. A flange joint manufacturing method in which a glass base material that reinforces a flange portion is arranged and resin is injected by vacuum injection molding. The flange joint manufacturing method includes a rectangular sheet-like glass base material and has a predetermined interval along an edge. The first reinforcing member that is cut in step 2 and the second reinforcing member that is made of a trapezoidal piece of glass base material are used. First, the first reinforcing member is placed along the peripheral surface of the lower columnar portion, and the cut Folded the portion along the bottom surface of the lower mold, thereby forming the cut portion of the first reinforcing member between the plurality of rectangular flange portion reinforcing portions and adjacent flange portion reinforcing portions Triangular gap Next, the second reinforcing member having a trapezoidal shape in which the flange portion reinforcing portions and the triangular gap portions on both sides thereof are combined is arranged so that the triangular portions of the adjacent second reinforcing members overlap each other. It is characterized by.

  The vacuum injection molding method is a well-known method. After the glass substrate is set in a molding die, the molding die is assembled, and a resin that has been stirred by adding a curing agent is injected into the molding die. Is obtained by impregnating a glass substrate placed in a mold and impregnating the resin with a resin and curing at normal temperature.

  According to the manufacturing method of the present invention, a glass fiber reinforced resin integral product of a flange joint manufactured by hand layup can be manufactured by a vacuum injection molding method. Production by the vacuum injection molding method is likely to generate cracks due to resin richness, but the resin is obtained by using the first reinforcing member that reinforces the cylindrical portion and the flange portion and the second reinforcing member that reinforces only the flange portion. Rich is eliminated. That is, when the flange portion forming layer of the glass base material is connected to the tube portion forming layer, the flange portion forming layer is uneven, and the trapezoidal shape is formed by combining the flange portion reinforcing portion and the triangular gap portions on both sides thereof. By using the second reinforcing member made of small pieces and arranging them so that the triangular portions of the adjacent second reinforcing members overlap each other, it is possible to reinforce the flange portion without unevenness, thereby filling it. While being able to raise the ratio of a glass base material, the excess and deficiency of a partial glass base material is suppressed, and generation | occurrence | production of the crack accompanying resin richness can be prevented.

  The glass substrate may be in the form of a mat such as a chopped strand mat or continuous strand mat, or may be in the form of a cloth such as a roving cloth, and a sheet or mat in which rovings in different directions are laminated. It may be in the form of a multilayer sheet composed of a plurality of layers such as a laminated sheet with cloth. Among these, it is particularly preferable to use a material obtained by laminating a reinforcing fiber knitted long fiber such as a roving cloth and a short fiber mat such as a chop mat and knitting with a yarn.

  As the resin, unsaturated polyester, vinyl ester, epoxy, phenol and the like can be used as appropriate.

  The length of the first reinforcing member is, for example, half the circumference. When the two first reinforcing members are butted together to form one layer and the next layer is stacked on one layer, the butted portion is It is preferable to shift. The length of the first reinforcing member may be the circumference, or 1/3 of the circumference. In any case, when the next layer is stacked on one layer, it is preferable to shift the butt portion. The number of cuts is not particularly limited, but may be, for example, about 8 to 24 with respect to the length of the circumference.

  In the present invention, “square”, “triangle” and “trapezoid” include not only a square, triangle and trapezoid where each side is a straight line, but also a square, triangle and trapezoid where some sides are replaced by curves. Shall be.

  According to the flange joint of the present invention, the flange portion forming layer of the glass base material is connected to the cylindrical portion forming layer, whereby the strength of the boundary portion between the flange portion and the cylindrical portion is increased, and the flange portion reinforcing piece Are arranged so that the triangular portions of adjacent ones overlap with each other, the flange portion is thick and reinforced with a sufficient amount of glass substrate, and has sufficient strength to withstand high pressure. This enables fastening using a fastening member such as a bolt when joining a multilayer pipe made of a hard vinyl chloride resin pipe whose outer peripheral surface is reinforced with a glass fiber reinforced resin layer. The stripping work can be omitted, and the joining work can be simplified.

  According to the flange joint manufacturing method of the present invention, when the flange portion forming layer of the glass base material is connected to the tube portion forming layer, the flange portion forming layer is uneven, and the second reinforcing member is adjacent to the second reinforcing member. By arranging the triangular portions of the reinforcing member so as to overlap each other, it is possible to reinforce the flange portion without unevenness, thereby increasing the proportion of the glass base material to be filled and a partial glass base material. Therefore, it is possible to prevent the occurrence of cracks due to resin richness. Thus, it is possible to manufacture a glass fiber reinforced resin integrated product of a flange joint, which has been difficult in the past.

FIG. 1 is a perspective view showing a flange joint according to the present invention. FIG. 2 is a longitudinal sectional view showing a multilayer pipe coupling structure using the flange joint according to the present invention. FIG. 3 is a cross-sectional view of a mold (lower mold and upper mold) used in the method for manufacturing a flange joint according to the present invention. FIG. 4A is a perspective view showing the upper mold used in the flange joint manufacturing method according to the present invention upside down, and FIG. 4B is a perspective view showing the lower mold. FIG. 5 is a perspective view showing a glass substrate arrangement state on the lower mold in the flange joint manufacturing method according to the present invention. FIG. 6A is a diagram showing a glass base (first reinforcing member) that reinforces the cylindrical portion and the flange of the flange joint, and FIG. 6B is a glass base that reinforces only the flange ( It is a figure which shows a 2nd reinforcement member. FIG. 7 is a perspective view showing a state in which the first reinforcing member of the first layer is arranged in the lower mold. FIG. 8 is a diagram illustrating a process of disposing the second reinforcing member on the first reinforcing member, in which (a) shows only the first reinforcing member, and (b) shows the first reinforcing member. The state which has arrange | positioned one 2nd reinforcement member on the top is shown, (c) has shown the state which has arrange | positioned another 2nd reinforcement member.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a flange joint made of glass fiber reinforced resin (FRP) according to the present invention, and FIG. 2 shows a multilayer pipe connection structure (1) using this flange joint (11).

  The flange joint (11) includes a cylindrical portion (12), a flange portion (13) provided at one end of the cylindrical portion (12), and an axially inner surface of the flange portion (13) at predetermined intervals in the circumferential direction. A plurality of triangular ribs (14) provided, and a plurality of bolt insertion holes (15) provided at the same interval as the ribs (14) in a portion near the outer periphery of the flange portion (13).

  Each rib (14) is formed across the outer peripheral surface of the cylindrical portion (12) and the inner surface in the axial direction of the flange portion (13), and a pair of triangular surfaces (14a) and a triangular surface (14a) And an inclined surface (14b) for connecting the oblique sides.

  The multilayer pipe coupling structure (1) is a structure in which a rigid polyvinyl chloride resin pipe whose outer peripheral surface is reinforced with a glass fiber reinforced resin layer is coupled using a flange joint, and the rigid polyvinyl chloride resin pipe (3) and A multilayer tube (2) made of a glass fiber reinforced resin layer (4) provided on the outer peripheral surface, a core (5) fitted on the outer periphery of the multilayer tube (2), and a core (5) And a flange joint (11) fitted on the outer peripheral surface.

  Two annular grooves (4a) are formed in the glass fiber reinforced resin layer (4) of the multilayer tube (2), and the core (5) is fitted into the annular groove (4a). An annular convex part (5a) is formed. The core (5) has a split structure composed of two semi-cylindrical bodies, so that the core (5) can be fitted into the multilayer pipe (2). The outer peripheral surface of the core (5) is a tapered surface. The inner peripheral surface of the flange joint (11) is a tapered surface corresponding to the taper surface of the core (5), and the flange joint (11) is a multilayer pipe ( After the core (5) is attached by being fitted to 2), the core (5) is fitted to the outer periphery of the core (5) by being moved axially outward along the multilayer tube (2).

  The multi-layer pipe connection structure (1) includes a bolt (16) inserted into a bolt insertion hole (15) by overlapping a flange joint (11) and a flange joint (17) of a mating flange joint or joint member. Combined by.

  The method for manufacturing a flange joint according to the present invention is to manufacture the above-described glass fiber reinforced resin flange joint (11) by a vacuum injection molding method.

  In the vacuum injection molding method, after the glass substrate is placed in the mold, the mold is assembled, and the resin that has been stirred by adding a curing agent is injected into the mold, and the air in the mold is sucked and molded. A molded article is obtained by impregnating a glass substrate placed in a mold with a resin and curing it at room temperature.

  In manufacturing the flange joint (11), the lower mold (21) and the upper mold (22) shown in FIGS. 3 and 4 are used.

 The lower die (21) has an annular flat surface (bottom surface) (21a) for forming the axially outer surface of the flange portion (13) and a short cylindrical surface for forming the outer peripheral surface of the flange portion (13). (21b) and a columnar part (21c) for forming the inner peripheral surface (tapered surface) of the cylindrical part (12) are formed.

  To form the annular flat surface (bottom surface) (22a) for forming the axial inner surface of the flange portion (13) and the outer peripheral surface (taper surface) of the cylindrical portion (12) on the upper die (22) An inner peripheral surface (22b), a top surface (22c) for forming an end surface of the cylindrical portion (12), and a plurality of rib forming recesses (23) are provided.

  Corresponding to each rib (14) having a pair of triangular surfaces (14a) and inclined surfaces (14b), each rib forming recess (23) has a triangular surface forming portion as shown in FIG. (23a) and an inclined surface forming part (23b). By providing the rib forming recess (23), the flat surface (22a) of the upper mold (22) has an opening of the rib forming recess (23), and the inner periphery of the flat surface (22a). Is uneven.

  As shown in FIG. 5, a glass base material (31) for reinforcing the cylindrical portion (12) and a glass base material (32) for reinforcing the flange portion (13) are arranged in the lower mold (21). Is done. Although not shown, a glass substrate for reinforcing the rib (14) is disposed on the upper mold (22).

  After placing the glass substrate (31) on the lower mold (21) and the upper mold (22), the upper mold (22) is overlaid on the lower mold (21), and the resin is injected. The resin is injected from one injection port (21d) provided in the lower mold (21) shown in FIG. 3, and the internal air is supplied from the two discharge ports (22d) provided in the upper mold (22) shown in FIG. Is extracted. As shown in FIG. 3, the end of the cylindrical portion (12) where the flange portion (13) is not provided is formed with a lid (12a), and the lid (12a) is cut off by post-processing. Thus, the open shape is as shown in FIG. The bolt insertion hole (15) is also formed by post-processing. The number of injection ports (21d) and discharge ports (22d) is not limited to two discharge ports (22d) with respect to one injection port (21d), and can be set as appropriate. One injection port and two discharge ports may be provided, and in this case, the lid (12a) may be eliminated. The positions of the inlet (21d) and the outlet (22d) can also be changed as appropriate.

  Next, with reference to FIG. 6 to FIG. 8, the glass base material arranging step on the lower mold (21) which is the main part of the flange joint according to the present invention and the manufacturing method thereof will be described in detail.

  FIG. 6 shows two types of reinforcing members (33) and (34) arranged on the lower mold (21). FIG. 6 (a) shows the first reinforcing member (33), The reinforcing member (33) has a plurality of rectangular shapes along the longitudinal direction of the rectangular tubular portion reinforcing portion (33a) without the cuts (S) by making the cuts (S) in the rectangular sheet-like base material. The flange portion reinforcing portion (33b) is arranged in a line. The cylindrical portion reinforcing portion (33a) has a length that can cover a half circumference along the columnar portion (21c) of the lower mold (21). The number of cuts (S) and flange reinforcements (33b) correspond to the number of ribs (14) (in this embodiment, the flange reinforcements (33b) are eight for a half circumference). ing. FIG. 6 (b) shows the second reinforcing member (34), and the second reinforcing member (34) is a trapezoidal small piece consisting of a square part (34a) and triangular parts (34b) on both sides thereof. ing. The rectangular portion (34a) has the same size as the flange portion reinforcing portion (33b) of the first reinforcing member (33). The triangular part (34b) has the same size as a triangular gap part (G) described later.

  In the glass substrate placement step, first, the first reinforcing member (33) is placed on the lower mold (21). At this time, as shown in FIG. 7, the cylindrical portion reinforcing portion (33a) without a cut is formed along the peripheral surface of the columnar portion (21c) of the lower die (21), and a plurality of flange portion reinforcing portions (33b) ) Where the cuts are lined up are bent along the flat surface (21a) of the lower die (21). Here, on the flat surface (21a) side, the gap between the flange portion reinforcing portion (33b) and the flange portion reinforcing portion (33b) is opened, and a triangular gap portion (G) is generated. Therefore, if only the first reinforcing member (33) is used as it is, the glass reinforcing portion of the flange portion (13) becomes uneven and the strength is insufficient. Therefore, in order to eliminate the triangular gap (G), the second reinforcing member (34) is used. The second reinforcing member (34) does not have a triangular shape corresponding to the triangular gap (G), but has two triangular gaps (G) and a rectangular flange portion sandwiched between them. A shape (trapezoidal shape) is formed by combining the portions (33b).

  In the arrangement step of the second reinforcing member (34), as shown in FIG. 8 (b), the second reinforcing member (34A) is placed on the first reinforcing member (33) in the state of FIG. 8 (a). ) And fill the triangular gap (G). The second reinforcing member (34B) to be arranged next is arranged so as to overlap the second reinforcing member (34A) arranged in advance. That is, as shown in FIG.8 (c), it arrange | positions so that the triangular-shaped part (34b) of adjacent 2nd reinforcement member (34A) (34B) may overlap. Thereby, the flange reinforcement part (33b) of the first reinforcement member (33) and the square part (34a) of the second reinforcement member (34A) (34B) overlap to form a two-layer glass reinforcement part, Even when the triangular portions (34b) of the second reinforcing members (34A) and (34B) overlap with each other, two layers of glass reinforcing portions are formed. As a whole, the cylindrical portion consists of one layer, and the flange portion has two layers. A reinforcing layer is formed. By repeating this several times, a flange joint is obtained in which the cylindrical portion is reinforced by several to ten or more layers and the flange portion is reinforced twice as much.

  The flange joint (11) thus obtained is reinforced with a glass substrate (first reinforcing member (33)) continuous from the cylindrical portion (12) to the flange portion (13), and the glass of the flange portion (13). The fiber reinforcing layer is twice as large as the cylindrical portion (12), and the glass fiber reinforcing layer of the flange portion (13) has no irregularities, is extremely strong, and can withstand a high pressure of several MPa.

  The number and shape of the ribs (14) and the glass base material for reinforcing the ribs (14) are not particularly limited, and the flange joint (11) may be provided with the ribs (14). (14) It may be omitted.

(11) Flange joint
(12) Tube section
(13) Flange
(21) Lower mold
(22) Upper mold
(33) First reinforcing member
(33a) Cylinder reinforcement (cylinder formation layer)
(33b) Flange reinforcement (flange formation layer)
(34) (34A) (34B) Second reinforcement member (Flange reinforcing piece)

Claims (2)

  A flange joint having a tube portion and a flange portion, and a glass fiber reinforced resin integrated product in which a glass base material for reinforcing the tube portion and the flange portion is disposed. A plurality of cylinder part forming layers to be formed, a plurality of flange part forming layers that are connected to each cylinder part forming layer to form a flange part, and a plurality of flange part reinforcing pieces stacked between the flange part forming layers, The flange portion forming layer has a triangular gap between adjacent reinforcing portions of the rectangular flange portion. The flange portion reinforcing piece is a base that combines the flange portion reinforcing portion and the gap portions on both sides thereof. A flange joint having a shape and arranged so that the triangular portions of adjacent flange portion reinforcing pieces overlap each other. A glass fiber reinforced resin integral flange joint with a cylindrical part and a flange part is placed on the lower base with a columnar part that forms the inner peripheral surface of the cylindrical part, and a glass substrate that reinforces the cylindrical part and the flange part is placed Then, a flange joint manufacturing method manufactured by injecting resin by vacuum injection molding,
A first reinforcing member made of a rectangular sheet-like glass base material and cut along the edge at a predetermined interval and a second reinforcing member made of a trapezoidal piece of glass base material are used. The reinforcing member is placed along the peripheral surface of the columnar portion of the lower mold, the cut portion is bent and is fitted along the bottom surface of the lower die, and the cut portion of the first reinforcing member is thereby formed into a plurality of rectangular shapes. The second reinforcement is formed into a shape composed of a triangular gap portion formed between the flange portion reinforcement portion and the adjacent flange portion reinforcement portion, and then a trapezoidal shape combining the flange portion reinforcement portion and the triangular gap portions on both sides thereof. A method for manufacturing a flange joint, wherein the members are arranged so that the triangular portions of adjacent second reinforcing members overlap each other.

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