JP2013036497A - Flange coupling and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flange coupling which enables coupling making a process of peeling off a gas fiber reinforced resin layer unnecessary, and which withstands high pressure, and to provide a method for manufacturing the flange coupling.SOLUTION: The flange coupling is an integrated product made of glass fiber reinforced resin, and includes a cylindrical part, a flange part, and triangular ribs that are provided to extend over an outer circumferential surface of the cylindrical part and an axial-direction inner side surface of the flange part at the predetermined spacing in the circumferential direction. In the method for manufacturing the flange coupling, a lower die 21 for forming an axial-direction outer side surface and an outer circumferential surface of the flange part, and an inner circumferential surface of the cylindrical part, and an upper die 22 provided with a recess 23 for forming a rib, and for forming an axial-direction inner side surface of the flange part, an outer circumferential surface and an end face of the cylindrical part, are used, a glass base material for reinforcing the cylindrical part and the flange part is arranged in the lower die 21. A glass base material for reinforcing the axial-direction outer side surface of the flange part and the ribs is arranged in the upper die 22, and the flange coupling is manufactured by filling the resin by the vacuum injection molding.

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).

JP 2003-207087 A

  In the coupling of the above-mentioned patent document 1, when removing the glass fiber reinforced resin tube from the composite tube, with a saw or the like, being careful not to cut between the hard vinyl chloride with respect to the glass fiber reinforced resin layer in the composite tube. After a cut is made and the part to be peeled off is heated with a burner or the like, a complicated work process of peeling off the glass fiber reinforced resin layer using pliers or the like is required. In particular, in a composite pipe used as a high-pressure pipe, the glass fiber reinforced resin layer is provided so as to be very thick, which makes the stripping operation more difficult.

  An object of the present invention is to provide a flange joint that can be bonded without requiring a step of stripping a glass fiber reinforced resin layer, and 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 triangular ribs are provided at predetermined intervals in the circumferential direction across the outer peripheral surface of the cylindrical portion and the axial inner surface of the flange portion. The whole is made into an integrated product made of glass fiber reinforced resin by a vacuum injection molding method.

  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. Since the flange joint is provided with ribs at predetermined intervals, the flange joint has high strength and can withstand high pressure.

  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. By using this forming method, the ratio of the glass substrate can be increased, which is advantageous in terms of securing the strength.

  A flange joint manufacturing method according to the present invention includes a cylindrical portion and a flange portion, and triangular ribs are provided at predetermined intervals in the circumferential direction across the outer peripheral surface of the cylindrical portion and the axial inner surface of the flange portion. A glass fiber reinforced resin integral flange joint, comprising: a lower mold for forming the axially outer and outer peripheral surfaces of the flange portion and the inner peripheral surface of the tubular portion; and a rib forming recess. An upper inner surface for forming the axial inner surface of the flange portion and the outer peripheral surface and end surface of the tube portion is provided, and a glass base material for reinforcing the tube portion and the flange portion is disposed on the lower die, A glass substrate for reinforcing the flange inner surface in the axial direction and ribs is disposed in the mold, and the resin is injected by vacuum injection molding.

  According to the manufacturing method of the present invention, it is possible to manufacture a glass fiber reinforced resin integrated product of a flanged flange joint that can withstand high pressure, which has been difficult in the past.

  As the glass base material, it is preferable to use a pre-molded product comprising an annular flange reinforcing portion along the axial inner side surface of the flange portion and a rib reinforcing portion extending along the inclined surface of the rib. The glass substrate of the pre-molded product is not particularly limited, and various types can be used.

  Moreover, it is preferable that the one-way roving cloth extended in an axial direction is used for the boundary part of a rib and a cylinder part as a glass base material. The unidirectional roving cloth is obtained by binding rovings with warps and wefts.

  Furthermore, a glass substrate is disposed on the flat surface of the upper mold, and the glass substrate includes an annular portion along the flat surface of the upper mold, a portion extending radially inward from the inner periphery of the annular portion, It is preferable to have a portion covering the opening of the rib forming recess. The glass substrate is not particularly limited, and various types can be used.

  By using part or all of the configuration of the glass substrate described above, the ratio of the glass substrate to be filled can be increased (a glass content of 50% or more is possible), and partial excess or deficiency of the glass substrate is possible. It can be suppressed and the occurrence of cracks due to resin richness can be prevented.

  In addition, as resin used at the time of vacuum injection molding, unsaturated polyester, vinyl ester, epoxy, phenol, etc. can be used suitably. These resins may be used as appropriate for the resins used when producing the pre-molded product.

  According to the flange joint of the present invention, the triangular ribs are provided at predetermined intervals in the circumferential direction across the outer peripheral surface of the cylindrical portion and the axial inner surface of the flange portion, and the whole is made of glass fiber by a vacuum injection molding method. Because it is made of reinforced resin, it can be fastened using a fastening member such as a bolt when joining a multi-layer pipe made of a hard vinyl chloride resin pipe whose outer peripheral surface is reinforced with a glass fiber reinforced resin layer. Thus, the work of stripping the glass fiber reinforced resin layer can be eliminated, and the joining work can be simplified. Moreover, since it is a glass fiber reinforced resin integrated product provided with ribs, it has high strength and can withstand high pressure.

  According to the flange joint manufacturing method of the present invention, the axial direction of the flange portion is provided with the lower mold for forming the axial outer side surface and outer peripheral surface of the flange portion and the inner peripheral surface of the cylindrical portion, and the rib forming recess. Use the inner die and the upper die to form the outer peripheral surface and end face of the cylinder part, place the glass base material that reinforces the cylinder part and the flange part in the lower mold, and place the glass part outside the flange part in the axial direction on the upper mold Since glass substrates that reinforce the side surfaces and ribs are placed and resin is injected by vacuum injection molding, the ratio of glass substrates to be filled can be increased, and partial glass substrate excess and deficiency And the occurrence of cracks due to resin richness can be prevented. In this way, it is possible to manufacture a glass fiber reinforced resin integral product of a flanged flange joint that can withstand high pressure, 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 the glass substrate placement step on the lower mold in the flange joint manufacturing method according to the present invention. FIG. 6 is a perspective view showing one of the glass substrate placement steps on the upper mold in the flange joint manufacturing method according to the present invention. FIG. 7 is a perspective view showing a pre-molded product used in one of the glass substrate placement steps on the upper mold in the flange joint manufacturing method according to the present invention. FIG. 8 is a perspective view showing one of the glass substrate placement steps on the upper mold in the flange joint manufacturing method according to the present invention. FIG. 9 is a diagram showing a unidirectional roving cloth that is the glass substrate used in FIG. 8.

  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) includes an annular flat surface (21a) for forming the axially outer surface of the flange portion (13) and a short cylindrical surface (21b) for forming the outer peripheral surface of the flange portion (13). And a columnar portion (21c) for forming an inner peripheral surface (tapered surface) of the cylindrical portion (12).

  The upper die (22) has an annular flat surface (22a) for forming the axial inner surface of the flange portion (13) and an inner periphery for forming the outer peripheral surface (tapered surface) of the cylindrical portion (12). A surface (22b), a top surface (22c) for forming the 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) has an opening of the rib forming recess (23), and the inner periphery of the flat surface (22a) is uneven. ing.

  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. As shown in FIGS. 6 to 9, the upper mold (22) includes a glass base (33) (34) for reinforcing the flange portion (13) and a glass base for reinforcing the rib (14). Materials (35) and (36) are arranged.

  After placing the glass substrate (33) (34) (35) (36) on the lower mold (21) and the upper mold (22), the upper mold (22) is stacked on the lower mold (21), and the resin 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, the glass substrate placement step on the upper mold (22) shown in FIGS. 6 to 9 will be described in detail.

  In the glass substrate placement step on the upper mold (22), first, as shown in FIG. 6, the glass substrate (33) (34) is formed on the portion corresponding to the axial inner side surface (13a) of the flange portion (13). Place. At this time, as shown in FIG. 6 (a), first, the glass substrate (33) of the first layer is arranged along the flat surface (22a) of the upper mold (22), and then the second layer of the second layer is arranged. A glass substrate (34) is placed. As shown in FIG. 6 (b), the second layer glass substrate (34) has an annular portion (the first layer glass substrate (33) and the first layer along the flat surface (22a) of the upper mold (22)). (Part of the same shape) (34a), a part (34b) extending radially inward from the inner periphery of the annular part (34a), and a part (34c) covering the opening of the rib forming recess (23) doing. The portion (34b) extending radially inward is provided to avoid the rib forming recess (23). A portion (34c) covering the opening of the rib forming recess (23) is divided into two by a cutting line (34d) provided in the center. For example, a chopped strand mat is used as the glass substrate (33) of the first layer and the glass substrate (34) of the second layer.

  Next, the pre-molded product (35) shown in FIG. 7 is arranged. The pre-molded product (35) is disposed on the upper mold (22) shown in FIG. 4 (a) upside down from the state shown in FIG. 7, and the axially inner side surface (13a) of the flange portion (13). ) And a plurality of rib reinforcing portions (35b) extending along the inclined surface (14b) of the rib (14). The pre-molded product (35) is a glass fiber reinforced resin part molded using a mold, and can be manufactured, for example, by a hand lay-up method. The flange reinforcement portion (35a) is provided with a recess (35c) corresponding to the opening of the rib forming recess (23), and each rib reinforcement portion (35b) is provided on the bottom surface (35d) of the recess (35c). ) So as to stand up from the upper mold (22).

  The flange reinforcing portion (35a) extends along the flat surface (22a) of the upper die (22), that is, in the first layer of the glass substrate (33) and FIG. 6 (b) shown in FIG. It arrange | positions so that it may overlap with the cyclic | annular part (34a) of the glass substrate (34) of the 2nd layer to show, and the rib reinforcement part (35b) is engage | inserted by the recessed part (23) for rib formation. By fitting the rib reinforcing part (35b) into the rib forming recess (23), the pre-molded product (35) is unlikely to come off the upper mold (22), and even when the upper mold (22) is reversed. The pre-molded product (35) does not fall off from the upper mold (22).

  Next, as shown in FIG. 8, the glass substrate (36) is arranged along the rib forming recess (23) extending in the substantially axial direction from the flat surface (22 a) of the upper mold (22). The glass substrate (36) is shaped like a band and is arranged so as to straddle each triangular surface forming portion (23a) and inner peripheral surface (22b) of the rib forming recess (23). The glass base material (36) can be arranged so that one end portion is buried under the glass base material (33) of the first layer shown in FIG. 6 (a), and the pre-molded product shown in FIG. It is possible before or after the arrangement of (35). As the strip-shaped glass substrate (36), as shown in FIG. 9, rovings (37a) as warps arranged in parallel in the same direction are bundled with wefts (37b) arranged at a large interval. It is a direction roving cross (37). The one-way roving cloth (37) is reinforced in the roving direction and is easily bent in a direction perpendicular to the roving direction. As the one-way roving cloth (37), for example, Vertical Dare R450N (trade name) manufactured by Unitika Ltd. is used.

  Note that the one-way roving cloth (37) is also used for the rib reinforcing portion (35b) of the pre-molded product (35), and the reinforcing direction is the same as that of the glass substrate (36) shown in FIG. .

  Next, although not shown in the drawing, the glass base material placement on the upper mold (22) is completed by filling the glass base material (for example, chopped strand mat) into the space where the rib forming recess (23) remains. Thereafter, the upper mold (22) is placed on the lower mold (21), and the resin is filled into the mold by vacuum injection molding.

  In the flange joint (11) shown in FIG. 1, the peripheral portions of the triangular ribs (14) indicated by P, Q, and S are locations that are resin-rich and easily cracked. As a result, the number of glass substrates is increased, and cracks associated with resin richness are prevented. P is the R portion at the boundary between the rib (14) and the cylindrical portion (12), Q is the R portion at the boundary between the rib (14) and the flange portion (13), and S is the cylindrical portion (12). And the R portion at the boundary between the flange portion (13).

  The increase in the glass substrate at the R portion at the boundary between the rib (14) and the cylinder portion (12) indicated by P is achieved by using the glass substrate (36) shown in FIG. 8 as a one-way roving cloth (37). ing. That is, since the glass substrate (36) which is a unidirectional roving cloth (37) extending in the axial direction bends along the boundary portion between the rib (14) and the tubular portion (12), the rib (14) A sufficient amount of glass base material is disposed in the R portion at the boundary between the cylindrical portion and the cylindrical portion (12), and the axial strength is increased to ensure durability.

  The increase in the glass substrate at the R portion at the boundary between the rib (14) and the flange portion (13) indicated by Q is the opening of the rib forming recess (23) of the second layer glass substrate (34) shown in FIG. This is achieved by the part (34c) covering the surface. That is, the portion (34c) covering the opening of the rib forming recess (23) of the glass substrate (34) of the second layer is the rib (when the upper die (22) is superimposed on the lower die (21). Since it bends along the root of 14), a sufficient amount of glass substrate is disposed at the R portion at the boundary between the rib (14) and the flange portion (13).

  The increase in the glass substrate at the R portion at the boundary between the cylindrical portion (12) and the flange portion (13) indicated by S is a portion extending inward in the radial direction of the glass substrate (34) of the second layer shown in FIG. 34b). That is, the portion (34b) extending inward in the radial direction of the glass substrate (34) of the second layer is formed in the upper mold (22) when the upper mold (22) is superimposed on the lower mold (21). Since it bends along the peripheral surface (22b), a sufficient amount of glass substrate is disposed at the R portion at the boundary between the cylindrical portion (12) and the flange portion (13).

  In the flange joint (11) thus obtained, the glass base is additionally installed around the triangular rib (14) indicated by P, Q, and S, so cracks and the like are generated in these portions. The glass fiber-reinforced ribbed material is extremely strong and can withstand high pressures of several MPa.

(11) Flange joint
(12) Tube section
(13) Flange
(14) Rib
(21) Lower mold
(22) Upper mold
(23) Recess for forming rib
(34) Second layer glass substrate
(34a) Annular part along the flat surface of the upper mold
(34b) A portion extending radially inward
(34c) The part covering the opening of the rib forming recess
(35) Pre-molded product
(35a) Flange reinforcement
(35b) Rib reinforcement
(36) Glass substrate (unidirectional roving cloth)

Claims (7)

  A flange joint having a cylindrical portion and a flange portion, wherein triangular ribs are provided at predetermined intervals in the circumferential direction across the outer peripheral surface of the cylindrical portion and the axial inner surface of the flange portion, and a vacuum injection molding method A flange joint characterized in that the whole is an integrated product made of glass fiber reinforced resin.   The pre-molded product comprising an annular flange reinforcing portion along the axial inner side surface of the flange portion and a rib reinforcing portion extending along the inclined surface of the rib is used as the glass substrate. 1 flange joint.   The flange joint according to claim 1 or 2, wherein a unidirectional roving cloth extending in the axial direction is disposed as a glass substrate at a boundary portion between the rib and the cylindrical portion.   A flange of a glass fiber reinforced resin integral product having a cylindrical portion and a flange portion, and having triangular ribs at predetermined intervals in the circumferential direction across the outer peripheral surface of the cylindrical portion and the axial inner surface of the flange portion A method of manufacturing a joint, comprising: a lower die for forming an axial outer surface and outer peripheral surface of a flange portion and an inner peripheral surface of a tube portion; and an inner inner surface of the flange portion provided with a rib forming recess And an upper mold for forming the outer peripheral surface and end face of the cylindrical portion, a glass base material for reinforcing the cylindrical portion and the flange portion is disposed in the lower mold, and the flange portion axially inner surface and A method for producing a flange joint, comprising: arranging a glass substrate for reinforcing ribs and injecting a resin by vacuum injection molding.   5. The pre-molded product comprising an annular flange reinforcing portion along the axial inner side surface of the flange portion and a rib reinforcing portion extending along the inclined surface of the rib is used as the glass substrate. Manufacturing method of flange joint.   6. The flange joint according to claim 4, wherein a unidirectional roving cloth extending in the axial direction is disposed as a glass base material at a boundary portion between the rib and the cylindrical portion.   A glass substrate is disposed on the flat surface of the upper mold, and the glass substrate has an annular portion along the flat surface of the upper die, a portion extending radially inward from the inner periphery of the annular portion, and a rib forming portion. The method for manufacturing a flange joint according to any one of claims 4 to 6, further comprising a portion covering the opening of the recess.

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