JP5226470B2 - Bending machine - Google Patents

Description

  The present invention relates to a bending apparatus that folds a laminate in which a prepreg of a fiber reinforced resin composite material is laminated along a forming convex mold.

  Conventionally, in order to form a molded article 17 which is a structural member having a U-shaped cross section as shown in FIG. A method of bending the laminate and then curing it has been used.

Conventionally, a bending apparatus shown in FIGS. 6 to 8 is sometimes used to perform the bending. Patent Document 1 also describes the same type.
The bending apparatus 100 can bend the prepreg laminate 5 into the shape of the molded product 17. In the bending apparatus 100, a trapezoidal shaped convex mold 3 having a trapezoidal cross section is disposed so as to protrude upward in the center of the box body 1 a at the upper end opening. Has been configured. Side blocks 4 and 4 for supporting the side portions of the laminated body 5 are fixed to the upper portions of the lifters 2 and 2.

As a bending molding method, first, the molding convex mold 3 is attached to the folding molding apparatus 100, the upper ends of the molding convex mold 3 and the upper ends of the side blocks 4, 4 are arranged at the same height, and a flat plate shape is formed thereon. The laminated body 5 is placed and positioned with respect to the molding convex mold 3.
Next, the laminated body 5 is covered with a bagging film 6 and fixed with a sealant 7 and sealed, and an external vacuum device is connected to the sealed space 1b.
Next, the sealed space 1b in the bending apparatus 100 is vacuumed by an external vacuum device. With this vacuum pressure, the laminate 5 is firmly adhered to the molding convex 3, the side blocks 4, 4 and the bagging film 6.
The laminated body 5 to be molded is obtained by laminating several to tens of fibers (prepreg) impregnated with resin.

Next, as shown in FIG. 7, the lifters 2, 2 are moved in the lowering direction 9, and the both sides of the laminate 5 are moved downward while the both sides of the laminate 5 are firmly attached to the side block 4 and the bagging film 6. Then, as shown in FIG. 8, the laminate 5 is brought into close contact with both side surfaces from the upper surface of the molding convex mold 3. In FIGS. 6 to 8 and FIGS. 1 to 4, the bagging film 6 is drawn without being in close contact with the laminated body or the side block for convenience of explanation, but actually is in close contact.
Japanese Patent Laid-Open No. 2006-312260

  As described above, the lifters 2 and 2 are moved in the lowering direction 9, and the both sides of the laminated body 5 are bent downward while the laminated body 5 is firmly attached to the side block 4 and the bagging film 6. As shown in FIG. 8, the laminate 5 is brought into close contact with the molding convex mold 3. At this time, since the adhesion of the laminated body 5 is reduced between the laminated portions of the portion bent downward, the molded product 11 formed as shown in FIG. Separation 8 collects air that is finely present between the layers to form an air pocket.

In the transition from the state shown in FIG. 6 to FIG. 7 and from FIG. 7 to FIG. 8, the laminate 5 is pressed against the molding convex 3 by the vacuum pressure in the sealed space 1 b, the lowering force of the lifter 2, and the adhesion force of the bagging film 6. It is done. At this time, an air pocket in the separation 8 generated between the stacked bodies 5 remains in the stacked body 5 because it is confined between the layers.
That is, in the conventional bending as described above, as the lifter 2 is lowered, the range in which both side portions of the laminate 5 are held between the side block 4 and the bagging film 6 is reduced, and loosening occurs between the laminates. For this reason, there is a problem that separation between layers occurs in a bent portion of the laminate 5 and fine air is collected to leave an air pocket in the product.

  The present invention has been made in view of the above problems in the prior art, and is a bending apparatus for bending a laminate in which a prepreg of a fiber reinforced resin composite material is laminated along a molding convex mold. It is an object of the present invention to suppress the interlaminar peeling of the laminated body and the occurrence of minute air accumulation between the laminated layers.

The invention according to claim 1 for solving the above-mentioned problems is a bending apparatus for bending a laminated body in which a prepreg of a fiber reinforced resin composite material is laminated along a molding convex mold,
Lifters are arranged on both sides of the molding convex mold,
Side blocks that support the side portions of the laminate extending from the upper end of the molding convex mold are respectively mounted on the upper portions of the lifters.
The upper part is elastically supported so that the laminated body support surface of the side block can be tilted so as to lower the outer end from the horizontal and away from the molding convex mold and to return the laminated body support surface to the horizontal. And
The molded convex mold, the both side blocks, and the laminate placed thereon are covered with a bagging film and confined in a sealed space, and the sealed space can be vacuum-sucked,
Due to the pressure applied from the bagging film accompanying an increase in the degree of vacuum in the sealed space, the upper part is tilted so that the outer surface of the laminated body support surface is lowered from the horizontal and separated from the forming convex mold. This is a bending device.

The invention according to claim 2 is characterized in that the molding convex mold has inclined surfaces whose normal direction is upward from the horizontal on both sides,
The upper surface on which the upper side block is mounted is inclined by lowering the outer end from the horizontal due to the tilt, and the lifter is lowered while maintaining the degree of vacuum of the sealed space more than the tilt can be maintained. 2. The bending apparatus according to claim 1, wherein the side block whose inner end abuts on the inclined surface moves in an obliquely downward direction while being guided by the inclined surface and the upper surface.

According to the present invention, the side block can be disposed close to the forming convex mold before the start of bending. Then, when the molded convex mold, both side blocks and the laminate placed thereon are covered with a bagging film and confined in a sealed space and vacuum sucked, due to pressurization from the bagging film accompanying the increase in the degree of vacuum, The upper part of the lifter tilts so as to lower the outer end of the laminate support surface of the side block from the horizontal and away from the forming convex mold. At this time, both side portions of the laminated body are sandwiched between the side block and the bagging film and bent downward while being pulled on both sides. By this operation, tension is applied to the laminated body, loosening of the laminated body is suppressed, and peeling between the laminated bodies due to bending is suppressed.
Further, by lowering the lifter while holding the sealed space in a vacuum, the side block whose inner end abuts against the inclined surface of the molding convex mold is guided obliquely to the inclined surface and the inclined upper surface of the upper portion of the lifter. Move in the direction. At this time, since the upper surface of the lifter is inclined with the outer end lowered from the horizontal due to the tilting, the side block is easily moved obliquely downward along the upper surface.
As described above, the side block whose inner end is in contact with the inclined surface of the molded convex mold is guided and moved by the inclined surface of the molded convex mold as the lifter is lowered. Therefore, in a series of bending operations, the range sandwiched between the side block and the bagging film of the laminate can be increased, and the range released from this clamping pressure can be decreased. Therefore, delamination between the laminated bodies accompanying bending is suppressed.
According to the present invention, as described above, there is an effect that it is possible to suppress the peeling between the laminates due to the bending and the generation of the fine air pool between the laminates.

  An embodiment of the present invention will be described below with reference to the drawings. The following is one embodiment of the present invention and does not limit the present invention.

   1 to 4 show cross-sectional views of different states of the bending apparatus of the present embodiment. FIG. 1 shows a state after the laminated body is sealed and before the folding is started. FIG. 2 shows a state in which the vacuum suction is started and the lifter upper portion 13 and the side block 19 are tilted and before the lifter is lowered. FIG. 3 shows a state where the lifter is being lowered. FIG. 4 shows a state after the folding is completed.

In this embodiment, the laminate 16 in which the prepregs of the fiber reinforced resin composite material are laminated is bent into the shape of the molded product 17 using the bending apparatus 1.
The bending apparatus 1 is configured such that a molding convex mold 3 having a trapezoidal cross section is disposed in a convex manner at the center of a box body 1 a having an upper end opening, and lifters that move up and down are disposed on both sides of the molding convex mold 3. Has been. The molding convex mold 3 has a trapezoidal cross section, and has inclined surfaces whose normal direction is upward from the horizontal on both sides corresponding to the side of the trapezoid. A side block 19 is mounted on the upper surface of the lifter.

The lifter includes a lifter lower part 12 and a lifter upper part 13. The lifter lower part 12 and the lifter upper part 13 are connected to each other by a hinge 15 so as to be tiltable. The hinge 15 connects the lifter upper portion 13 to the lifter lower portion 12 so as to be rotatable around a horizontal axis parallel to the inclined surface of the molding convex die 3.
The lifter upper portion 13 is elastically supported on the lifter lower portion 12 by a spring 14. The hinge 15 is disposed near the inner end, while the spring 14 is disposed near the outer end. With this configuration, the lifter upper portion 13 can be tilted in the rotation direction 18 so that the upper end thereof and the upper surface of the side block 19 (laminated body support surface) are lowered from the horizontal and the outer end thereof is separated from the molding convex mold 3. The upper surface is elastically supported so as to return to the horizontal. The lifter moves up and down to a predetermined position by a combination of a rack and a pinion or a hydraulic mechanism.

The bending apparatus 1 includes a mold mounting base 1c disposed in the box 1a, an air suction tool mounting port that can be connected to an external vacuum device (not shown), and a lifter operating mechanism. .
Further, the bending apparatus 1 has a function of using the bagging film 6 and the sealant 7 after the laminated body 16 is installed and vacuum-sucking the sealed space 1b in the apparatus by the external vacuum apparatus to keep it in a vacuum state.

  In order to perform bending with the bending apparatus 1, first, as shown in FIG. 1, the forming convex mold 3 and the side block 19 are arranged at the same height, and the inner end of the side block 19 It abuts on the inclined surface of the mold 3. The laminated body 16 is placed on the molding convex mold 3 and the side block 19, and then these are covered with the bagging film 6 and sealed in the folding molding apparatus 1 with the sealant 7 attached to the box 1 a.

Next, the air in the sealed space 1b is discharged by the external vacuum device. The laminate 16 is tightly adhered to the molding convex 3, the side block 19, and the bagging film 6 by the action of the vacuum in the sealed space 1 b. With the above-described mechanism, the bending apparatus 1 causes the upper surface of the lifter upper portion 13 to lower the outer end together with the side block 19 by the pressurization from the bagging film 6 accompanying the increase in the degree of vacuum in the sealed space 1b. Tilt away from the mold 3.
As the degree of vacuum in the sealed space 1 b increases, the lifter upper portion 13 is pushed and fixed to the lifter lower portion 12 by a vacuum pressure from a substantially horizontal position held by the spring 14 and the hinge 15. At the same time, as shown in FIG. 2, the laminate 16 is smoothly bent in accordance with the tilt of the lifter upper portion 13 in a state of being firmly attached to the side block 19 and the bagging film 6 by the vacuum suction pressure. Furthermore, the laminate 16 has a wide sticking contact range at the bent portion and is smoothly bent in the rotation direction 18, so that slippage between the laminates occurs gently and becomes a uniform bend.

  Next, the bending apparatus 1 lowers the lifter. As the lifter is lowered as shown in FIG. 3, the laminate 16 is bent while being lowered in the lifter lowering direction 9. At this time, the bent portion of the laminated body 16 is not stuck between the side blocks 19 and the bagging film 6, so that there is no separation between the laminations. It is molded so as to be closely attached. By lowering the lifter while holding the sealed space 1b in a vacuum, the side block 19 whose inner end abuts against the inclined surface of the molding convex mold 3 is guided to the inclined upper surface of the inclined surface and the upper portion of the lifter 13 to be inclined. Move it down.

Further, the bending apparatus 1 lowers the lifter in the lowering direction 9 as shown in FIG. In this process, both side portions of the laminate 16 that are fixedly adhered to each other by the side block 19 and the bagging film 6 are brought into close contact with the forming convex mold 3 in accordance with the movement in the lowering direction 9.
The folding molding by the folding molding apparatus 1 is thus completed.

  As described above, both side portions of the laminated body 16 receive a tensile force to the outside due to the tilting of the lifter upper portion 13 and the side block 19, and the force to be held between the side block 19 and the bagging film 6 is increased in a larger range. Since it is received and held, slippage between the laminates 16 occurs smoothly. For this reason, the adhesion between the laminates of the laminate 16 is maintained, and the peeling between the laminates is suppressed. Therefore, according to the bending forming apparatus 1, a molded product 17 can be obtained in which separation between layers and air retention are not generated in a bent portion as shown in FIG. 5.

It is sectional drawing of the bending apparatus which concerns on one Embodiment of this invention, and a to-be-molded object. It is sectional drawing of the bending apparatus which concerns on one Embodiment of this invention, and a to-be-molded object. It is sectional drawing of the bending apparatus which concerns on one Embodiment of this invention, and a to-be-molded object. It is sectional drawing of the bending apparatus which concerns on one Embodiment of this invention, and a to-be-molded object. It is a perspective view of the molded article which concerns on one Embodiment of this invention. It is sectional drawing of the bending apparatus which concerns on a prior art, and a to-be-molded object. It is sectional drawing of the bending apparatus which concerns on a prior art, and a to-be-molded object. It is sectional drawing of the bending apparatus which concerns on a prior art, and a to-be-molded object. It is a perspective view of the molded article in which peeling between conventional laminations occurred.

Explanation of symbols

1 b Sealed space 1 Bending device 1 a Box 2 Lifter 3 Molding convex 4 Side block 5 Laminate 6 Bagging film 7 Sealant 8 Peel 11 Molded product 12 Lower lifter 13 Lifter upper 14 Spring 15 Hinge 16 Laminate 17 Molded product 18 Rotating direction 19 Side block 100 Bending device

Claims (2)

A bending apparatus that bends and laminates a laminate in which prepregs of fiber reinforced resin composites are formed along a molding convex shape,
Lifters are arranged on both sides of the molding convex mold,
Side blocks that support the side portions of the laminate extending from the upper end of the molding convex mold are respectively mounted on the upper portions of the lifters.
The upper part is elastically supported so that the laminated body support surface of the side block can be tilted so as to lower the outer end from the horizontal and away from the molding convex mold and to return the laminated body support surface to the horizontal. And
The molded convex mold, the both side blocks, and the laminate placed thereon are covered with a bagging film and confined in a sealed space, and the sealed space can be vacuum-sucked,
Due to the pressure applied from the bagging film accompanying an increase in the degree of vacuum in the sealed space, the upper part is tilted so that the outer surface of the laminated body support surface is lowered from the horizontal and separated from the forming convex mold. Bending device. The molding convex mold has inclined surfaces on both sides whose normal direction is upward from horizontal,
The upper surface on which the upper side block is mounted is inclined by lowering the outer end from the horizontal due to the tilt, and the lifter is lowered while maintaining the degree of vacuum of the sealed space more than the tilt can be maintained. 2. The bending apparatus according to claim 1, wherein the side block whose inner end abuts on the inclined surface moves in an obliquely downward direction while being guided by the inclined surface and the upper surface.

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