JP6218562B2 - Molding material - Google Patents

Description

  The present invention relates to a molding member used for heating and pressure-molding a fiber-reinforced plastic hollow molded article in which one longitudinal ends of first and second molding hollow members are connected to each other.

  2. Description of the Related Art Conventionally, molding hollow members used for heating and pressure molding of fiber reinforced plastic hollow molded products are known.

  The hollow member for molding shown in Patent Document 1 includes a hollow body made of silicone rubber and a woven fabric embedded in the hollow body. This molding hollow member is compression-molded using a mold. And since the intensity | strength of the hollow member for shaping | molding increases by embedding a woven fabric in a hollow body as mentioned above, the pressure | voltage resistance and shrinkage resistance of the hollow member for shaping | molding can be improved. Therefore, when a hollow molded product is heated and pressure-molded using the molding hollow member, the molding hollow member can be prevented from bursting, and the molding hollow member is repeatedly used for heating and pressure molding. In addition, shrinkage of the molding hollow member can be suppressed.

JP 2009-179001 A

  By the way, when making the above hollow molded article long, it is conceivable to change the equipment and lengthen the hollow member for molding, but in that case, capital investment is required, which is not preferable in terms of cost. .

  Therefore, it is conceivable that the two molding hollow members are manufactured with existing equipment and the longitudinal ends of these molding hollow members are connected to each other so as to be elongated.

  Thus, when connecting the longitudinal direction one end parts of the hollow member for shaping | molding, in order to ensure the connection, it is desirable to position the hollow member for shaping | molding. Moreover, in order to suppress the air leak in the connection part of the longitudinal direction one ends of the shaping | molding hollow member, it is also necessary to ensure the sealing performance of the connection part.

  This invention is made in view of this point, and the place made into the subject is ensuring the sealing performance in the connection part of the longitudinal direction one end parts of the hollow member for shaping | molding while positioning the hollow member for shaping | molding. There is to do.

  In order to solve the above-described problems, the present invention forms a recess on the inner peripheral surface of the connecting portion between the longitudinal ends of the first and second molding hollow members and is fitted in the recess on the outer peripheral surface. The connecting hollow member in which the convex portions are formed is fitted into the connecting portion between the longitudinal ends of the first and second molding hollow members via an adhesive.

  Specifically, the present invention provides a molding member used for heating and pressure-molding a fiber-reinforced plastic hollow molded article in which the longitudinal ends of the first and second molding hollow members are connected to each other. Targeted the following solutions.

That is, according to the first invention, each of the molding hollow members has a silicone rubber hollow body, and the inner peripheral surface of the connecting portion between the longitudinal ends of the first and second molding hollow members. Is formed over the entire circumference so as not to reach the outer peripheral surface of the molding member, straddling the first and second molding hollow members. A convex portion that is fitted into the connecting portion between the longitudinal ends of the hollow member via an adhesive, and that is substantially complementary to the concave portion and fitted into the concave portion at a portion corresponding to the concave portion on the outer peripheral surface. The part is provided with a silicone rubber connecting hollow member formed over the entire circumference.

According to this, on the inner peripheral surface of the connecting portion between the longitudinal ends of the first and second molding hollow members, the recess extends across the first and second molding hollow members and the outer periphery of the molding member. It is formed over the entire circumference so as not to reach the surface . In addition, a convex portion that is substantially complementary to the concave portion and fitted into the concave portion is formed over the entire circumference in a portion corresponding to the concave portion on the outer peripheral surface of the connecting hollow member. For this reason, the hollow member for shaping | molding can be positioned in the hollow member for connection by these convex parts and recessed parts.

  Moreover, a recessed part becomes a reservoir of an adhesive agent at the time of the connection of the longitudinal direction one ends of the 1st and 2nd hollow member for shaping | molding. For this reason, the sealing performance in the connection part of the longitudinal direction one end parts of the 1st and 2nd hollow member for shaping | molding is securable.

The fiber reinforced plastic is a material reinforced and reduced in weight by dispersing glass fiber, carbon fiber and the like in the plastic.

  In a second aspect based on the first aspect, the concave portion and the convex portion have a circumferential cross section formed in a substantially triangular shape.

  According to this, since the circumferential cross section of the concave portion and the convex portion is formed in a substantially triangular shape, the processing can be easily performed.

  According to a third invention, in the first or second invention, each of the molding hollow members further includes a cloth inner layer provided so as to cover an inner peripheral surface of the hollow body.

  By the way, when the fibers in the inner layer jump out from one end in the longitudinal direction of the molding hollow member, the jumped fibers create a gap between the one end surfaces in the longitudinal direction of the first and second molding hollow members. There is a possibility that the connection between the longitudinal ends of the two molding hollow members is uncertain.

Here, according to the present invention, a recess is formed across the first and second molding hollow members on the inner peripheral surface of the connecting portion between the longitudinal ends of the first and second molding hollow members. It is formed over the entire circumference so as not to reach the outer peripheral surface of the member for use . In this way, by forming the concave portion, it is possible to remove the fibers of the inner layer protruding from one end portion in the longitudinal direction of the molding hollow member. For this reason, the connection of the longitudinal direction one end parts of the 1st and 2nd hollow member for shaping | molding can be ensured.

  According to a fourth invention, in any one of the first to third inventions, each of the molding hollow members further includes a resin coat layer provided so as to cover an outer peripheral surface of the hollow body. It is what.

  According to this, since the resin coating layer is provided so as to cover the outer peripheral surface of the hollow body, the outer peripheral surface side of the molding member can have a certain degree of rigidity. For this reason, it can suppress that the member for shaping | molding does not pull out from a prepreg.

According to the present invention, the concave portion is formed on the inner peripheral surface of the connecting portion between the longitudinal ends of the first and second molding hollow members across the first and second molding hollow members. A convex portion that is formed over the entire circumference so as not to reach the outer peripheral surface and that has a shape substantially complementary to the concave portion and fitted into the concave portion is formed in the portion corresponding to the concave portion on the outer peripheral surface of the connecting hollow member. Since it is formed over the circumference, the hollow member for molding can be positioned on the hollow member for connection by these convex portions and concave portions. Moreover, since a recessed part becomes a pool of an adhesive agent at the time of the connection of the longitudinal direction one end parts of the 1st and 2nd shaping | molding hollow member, the connection part of the longitudinal direction one end parts of the 1st and 2nd shaping | molding hollow member The sealing performance can be ensured.

It is a longitudinal cross-sectional view which shows the member for shaping | molding which concerns on embodiment of this invention. It is an expanded longitudinal cross-sectional view which shows the principal part of the member for shaping | molding. It is a front view which shows the hollow member for shaping | molding. It is a perspective view which shows the hollow member for a connection. It is a perspective view which shows a part of manufacturing process of the member for shaping | molding.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the invention, its application, or its use.

  As shown in FIGS. 1 and 2, a molding member (molding bladder) 1 according to an embodiment of the present invention has one end in the longitudinal direction (length direction) of the first and second molding hollow members 2 and 3. It is used for autoclave molding of hollow molded products (for example, hollow pipes and hollow frames) made of fiber reinforced plastic (hereinafter referred to as FRP) connected to each other, and the total length is, for example, about 15 m. .

  The first and second molding hollow members 2 and 3 have substantially the same shape and size in cross section. Specifically, as shown in FIG. 3, each of the molding hollow members 2 and 3 includes silicone rubber hollow bodies 20 and 30 whose inner and outer peripheral surfaces have a substantially rectangular cross-sectional shape. This silicone rubber is excellent in heat resistance, chemical resistance, water repellency, electrical insulation and the like. Each of the molding hollow members 2 and 3 includes woven fabric reinforcing inner layers (hereinafter simply referred to as “inner layers”) 21 and 31 provided so as to cover the entire inner peripheral surfaces of the hollow bodies 20 and 30. Resin coat films (coat layers) 22 and 32 are provided so as to cover substantially the entire outer peripheral surface of the hollow bodies 20 and 30. The woven fabric of the inner layers 21 and 31 is made of polyethylene fiber, for example. The coat films 22 and 32 are made of, for example, a fluororesin.

Inner circumference of the connecting portion 4 between the longitudinal ends of the first and second molding hollow members 2 and 3 (hereinafter also simply referred to as “the connecting portion 4 of the first and second molding hollow members 2 and 3”). On the surface, the recess 40 is formed over the entire circumference so as not to reach the outer peripheral surface of the molding member 1 across the first and second molding hollow members 2 and 3. The recess 40 is formed so as not to reach the outer peripheral surface of the molding member 1. The concave portion 40 has a circumferential cross section (transverse cross section) formed in a substantially triangular shape. The first molding hollow member 2 side portion 40a and the second molding hollow member 3 side portion 40b of the recess 40 have substantially the same shape (substantially triangular shape) and size in the circumferential cross section. The first molding hollow member 2 side portion 40a and the second molding hollow member 3 side portion 40b chamfer the corner on the inner peripheral side of one end surface in the longitudinal direction of each molding hollow member 2,3. It is formed by. By this chamfering, the fibers of the inner layers 21 and 31 protruding from one end in the longitudinal direction of each of the molding hollow members 2 and 3 can be removed. Moreover, the recessed part 40 becomes a pool of the adhesive agent B mentioned later at the time of the connection of the longitudinal direction one ends of the 1st and 2nd hollow members 2 and 3 for molding.

  A connecting hollow member (joint cap member) 5 is fitted through an adhesive B in the connecting portion 4 of the first and second forming hollow members 2 and 3. As shown in FIG. 4, the connecting hollow member 5 has a cross-sectional shape that is substantially complementary to the cross-sectional shape of the inner peripheral surfaces of the first and second molding hollow members 2 and 3 (substantially rectangular). Shape) made of silicone rubber. The adhesive B is, for example, a silicone rubber type. In FIG. 2, illustration of the adhesive B is omitted for easy understanding of the drawing.

  On the outer peripheral surface of the connecting hollow member 5, a convex portion 50 having a shape substantially complementary to the concave portion 40 (circumferential cross section is substantially triangular) extends over the entire circumference at a portion corresponding to the concave portion 40 (central portion in the longitudinal direction). Is formed. The convex portion 50 is fitted into the concave portion 40. These convex portions 50 and concave portions 40 are used to position the forming hollow members 2 and 3 on the connecting hollow member 5.

  Both ends in the longitudinal direction of the outer peripheral surface of the connecting hollow member 5 are formed in a tapered shape. For this reason, at the time of connecting the longitudinal ends of the first and second molding hollow members 2, 3, both longitudinal ends of the outer peripheral surface of the connection hollow member 5 and the first and second molding hollow members 2, 2 are connected. A portion between the inner peripheral surface 3 and the adhesive B is a reservoir. Therefore, it is possible to ensure the sealing performance at the connection portion 4 of the first and second molding hollow members 2 and 3.

  The molding member 1 becomes a hollow member as a whole by adopting the configuration as described above. An end cap 6 is fitted into one end portion in the longitudinal direction of the molding member 1, and an aluminum tube 7 is connected to the other end portion. The molding member 1 has a heating temperature (about 180) at the time of autoclave molding of a hollow molded product because the molding hollow members 2 and 3 and the connecting hollow member 5 are made of silicone rubber having excellent heat resistance as described above. Heat resistance). Details of this autoclave molding method will be described later.

  Hereinafter, the manufacturing method of the molding member 1 will be described with reference to FIG. First, a woven fabric, a silicone rubber rubber sheet, and a fluororesin resin film are wound around a mandrel (core mold) (not shown) in this order. Then, in a state where the woven fabric, the rubber sheet, and the resin film are wound around the mandrel, the woven fabric, the rubber sheet, and the resin film are compression-integrated and molded by sandwiching between an upper mold and a lower mold (not shown). Then, the upper mold and the lower mold are opened, and the mandrel is extracted from the woven fabric, the rubber sheet and the resin film which are compression-integrated. Thereafter, the woven fabric, the rubber sheet and the resin film that are compression-molded are placed in a secondary vulcanizing furnace and subjected to secondary vulcanization (reheating) in order to stabilize the characteristics of the silicone rubber. Then, the secondary vulcanized woven fabric, rubber sheet and resin film are cut to a predetermined length. Thus, the molding hollow member is completed. Two of these molding hollow members are prepared (hereinafter, one of these molding hollow members is referred to as a first molding hollow member 2 and the other is referred to as a second molding hollow member 3). Moreover, the fiber of the inner layers 21 and 31 may jump out from the longitudinal direction one end part of each shaping | molding hollow member 2 and 3 by the above-mentioned cutting | disconnection.

  Next, the corner on the inner peripheral side of one end surface in the longitudinal direction of each of the molding hollow members 2 and 3 is chamfered. By this chamfering, the fibers of the inner layers 21 and 31 protruding from one end in the longitudinal direction of each of the molding hollow members 2 and 3 can be removed.

  Next, the bonding surface with the connecting hollow member 5 and the outer peripheral surface of the connecting hollow member 5 on the inner peripheral surface of one end in the longitudinal direction of each of the forming hollow members 2 and 3 are degreased. Then, the adhesive B is applied to the bonding surfaces of the molding hollow members 2 and 3 and the outer peripheral surface of the connecting hollow member 5. The first and second molding hollow members 2 and 3 are inserted and fitted into the longitudinal ends of the first and second molding hollow members 2 and 3, respectively. The end faces in the longitudinal direction of each other are butted together. At this time, the forming hollow members 2 and 3 can be positioned on the connecting hollow member 5 by the convex portion 50 of the connecting hollow member 5 and the concave portion 40 of the forming hollow members 2 and 3. Further, due to the above-described fitting, the surplus adhesive B from the portion between the bonding surface of the molding hollow members 2 and 3 and the outer peripheral surface of the connection hollow member 5 becomes the first and second molding hollow members 2 and 2. 3 overflows from one end surface in the longitudinal direction to the outer peripheral surface side of the molding hollow members 2 and 3. The overflowing adhesive B is wiped off.

  Next, a masking tape (not shown) is stretched over the entire circumference on the outer peripheral surface of the connecting portion 4 of the first and second molding hollow members 2 and 3 across the first and second molding hollow members 2 and 3. Paste. Further, the masking tape 8 (see FIG. 5) is extended longitudinally across the first and second molding hollow members 2 and 3 on the outer peripheral surface of the connecting portion 4 of the first and second molding hollow members 2 and 3. Paste to extend in the direction.

  Next, as shown in FIG. 5, the connection portions 4 of the first and second molding hollow members 2, 3 are fixed by a fixture 9. Specifically, the fixture 9 includes a first fixture 90 and a second fixture 91. The first fixing fitting 90 is a plate-like member having a shape (substantially hat shape) substantially complementary to the cross-sectional shape of the outer peripheral surface of the molding hollow members 2 and 3. The second fixture 91 is a flat plate member. And the connection part 4 of the 1st and 2nd shaping | molding hollow members 2 and 3 is surrounded by the 1st and 2nd fixing bracket 90,91. Then, the first and second fixing brackets 90 and 91 are fixed by the clip 92. Thus, the fixing of the first and second molding hollow members 2 and 3 is completed.

  Next, the molding hollow members 2 and 3 and the connection hollow member 5 fitted to each other are placed in an adhesive curing furnace (not shown), and are subjected to a predetermined time (for example, 2 ° C.) at a predetermined temperature (for example, 150 ° C.). Time), cure.

  Next, the forming hollow members 2 and 3 and the connecting hollow member 5 fitted to each other are taken out from the adhesive curing furnace, and the fixing fitting 9 and the masking tape 8 are removed.

  Thus, the molding member 1 is completed.

  Hereinafter, an autoclave molding method for FRP hollow molded products using the molding member 1 will be described. First, plastic, fiber, and plastic are wound around the molding member 1 in this order. Then, these plastics and fibers are pressed around the molding member 1 with a roller to form a laminated prepreg. Then, the laminated prepreg is wound around the molding member 1 and placed in an autoclave (pressure vessel) and cured by applying a predetermined heat under a predetermined pressure. At this time, since pressure is applied to the prepreg from both the outer side and the inner side, the surface portion constituting the hollow molded product can be straightened. Thereafter, the cured prepreg is taken out from the autoclave, and the molding member 1 is taken out. Here, since the forming member 1 has flexibility and flexibility by adopting the configuration as described above, the forming member 1 can be easily pulled out from the prepreg. As a result, a hollow molded product having a total length of about 15 m is completed.

-Effect-
As described above, according to the present embodiment, the first and second molding hollow members 2 and 3 are formed on the inner peripheral surface of the connection portion 4 between the longitudinal ends of the first and second molding hollow members 2 and 3. The recess 40 is formed over the entire circumference so as not to reach the outer peripheral surface of the molding member 1 . Further, a convex portion 50 having a shape substantially complementary to the concave portion 40 and fitted into the concave portion 40 is formed over the entire circumference at a portion corresponding to the concave portion 40 on the outer peripheral surface of the connecting hollow member 5. . For this reason, the molding hollow members 2 and 3 can be positioned on the connection hollow member 5 by the convex portions 50 and the concave portions 40.

  Further, since this positioning is performed in the first and second molding hollow members 2 and 3, the positioning means does not come out on the outer peripheral surface side of the molding member 1.

  Further, the concave portion 40 serves as a reservoir for the adhesive B when the longitudinal ends of the first and second molding hollow members 2 and 3 are connected to each other. For this reason, the sealing property in the connection part 4 of the 1st and 2nd hollow members 2 and 3 for shaping | molding is securable.

  Moreover, since the circumferential cross section of the recessed part 40 and the convex part 50 is formed in the substantially triangular shape, the process can be performed easily.

A recess 40 is formed on the inner peripheral surface of the connecting portion 4 of the first and second molding hollow members 2 and 3 so as to straddle the first and second molding hollow members 2 and 3. It is formed over the entire circumference so as not to reach the surface . In this way, by forming the recess 40, the fibers of the inner layers 21 and 31 protruding from one end in the longitudinal direction of the molding hollow members 2 and 3 can be removed. For this reason, the connection of the longitudinal direction one ends of the 1st and 2nd shaping | molding hollow members 2 and 3 can be ensured.

  Moreover, since the fluororesin coat films 22 and 32 are provided so as to cover the outer peripheral surfaces of the hollow bodies 20 and 30, the outer peripheral surface side of the molding member 1 can have a certain degree of rigidity. For this reason, it can suppress that the member 1 for shaping | molding does not pull out from a prepreg.

(Other embodiments)
In the above embodiment, the two hollow molding members 2 and 3 are connected, but three or more hollow molding members may be connected.

  Moreover, in the said embodiment, although the shaping | molding hollow members 2 and 3 were comprised by the hollow bodies 20 and 30, the inner layers 21 and 31, and the coat films 22 and 32, it is not restricted to this, For example, the hollow bodies 20 and 30 and It may be composed of the coat films 22 and 32 or may be composed only of the hollow bodies 20 and 30.

  Moreover, in the said embodiment, although the cross-sectional shape of the internal peripheral surface of the hollow bodies 20 and 30 was formed in the substantially rectangular shape, and the cross-sectional shape of the outer peripheral surface was formed in the substantially rectangular shape, it is not restricted to this, Other shapes You may form in.

  Moreover, in the said embodiment, although the circumferential cross section of the recessed part 40 and the convex part 50 was formed in the substantially triangular shape, you may form not only in this but in a circular shape, for example.

  As described above, the molding member according to the present invention positions the molding hollow member and uses the sealing member at the connecting portion between the longitudinal ends of the molding hollow member. Can be applied to.

DESCRIPTION OF SYMBOLS 1 Molding member 2,3 Molding hollow member 20,30 Hollow body 21,31 Inner layer 22,32 Coat film (coat layer)
4 Connection 40 Recess 5 Hollow member for connection
50 Convex B Adhesive

Claims (4)

A molding member used for heating and pressure molding a hollow molded product made of fiber reinforced plastic, in which longitudinal ends of the first and second molding hollow members are connected to each other.
Each of the molding hollow members has a silicone rubber hollow body,
The inner peripheral surface of the connecting portion between the longitudinal ends of the first and second molding hollow members has a recess extending over the first and second molding hollow members and the outer peripheral surface of the molding member. It is formed over the entire circumference so as not to reach
The first and second molding hollow members are fitted into a connecting portion between the longitudinal ends of the first and second molding hollow members via an adhesive, and have a shape substantially complementary to the concave portion in a portion corresponding to the concave portion on the outer peripheral surface. A molding member comprising a silicone rubber connecting hollow member in which a convex portion fitted into the concave portion is formed over the entire circumference. The molding member according to claim 1,
The forming member, wherein the concave portion and the convex portion have a substantially triangular cross section in the circumferential direction. The molding member according to claim 1 or 2,
Each of the molding hollow members further has a cloth inner layer provided so as to cover the inner peripheral surface of the hollow body. In the molding member according to any one of claims 1 to 3,
Each of the molding hollow members further has a resin coating layer provided so as to cover the outer peripheral surface of the hollow body.

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