JP5914311B2 - Reinforcing member and reinforcing method for resin molded body - Google Patents

Description

  The present invention relates to a reinforcing member and a reinforcing method for a resin molded body capable of improving the mechanical properties of a weld line formed at a junction of molten resins.

  Conventionally, as a method for increasing the mechanical properties of the weld line formed at the joining portion of the molten material, as shown in FIG. 4, there are a plurality of bent plates 100 bent in a substantially bellows shape, or a plurality of so as to enter from opposite directions. After the block formed with the concave portion is arranged at the joint portion of the molten material, the molten material is injected and the molten material is accommodated in the concave portion, thereby preventing the joint portion from being formed in a straight line. There is disclosed a method for reinforcing a weld line so as to increase the mechanical properties (see, for example, Patent Document 1).

JP 63-221023 A

  According to Patent Document 1, the molten material is accommodated in the concave portions such as the bent plate 100 and the block from opposite directions, and the merging portions are arranged in a staggered manner so as not to be in a straight line, thereby reinforcing the flow direction of the molten material. ing. This reinforces the moment (or load) acting in the vertical direction of the paper surface indicated by M in the figure, but the weld line is still on a single line in the direction perpendicular to the flow of the molten material. Therefore, the moment (or load) acting in the front and back direction of the paper surface is not sufficiently reinforced, and desired mechanical properties cannot be obtained.

  This invention is made | formed in view of the subject mentioned above, The objective is to provide the reinforcement member and reinforcement method of the resin molding which can reinforce the mechanical physical property of a weld line in a three-dimensional direction. .

The invention according to claim 1
A resin reinforcing member (for example, in an embodiment described later) that reinforces a resin molded body (for example, a resin molded body 20 in an embodiment described later) formed of a molten resin (for example, a molten resin 32 in an embodiment described later). Reinforcing member 10),
It is constituted by a plurality of reinforcing materials (for example, reinforcing materials 11 in the embodiments described later) formed in a substantially rod shape,
The plurality of reinforcing materials are arranged in an XY plane so that a part of the adjacent reinforcing materials overlap with each other, and gaps (for example, voids in the embodiments described later) are arranged between every other adjacent reinforcing materials. 13) and a first reinforcing material group (for example, a first reinforcing material group 12A in an embodiment described later), and the first reinforcing material group in the Z direction orthogonal to the XY plane are arranged at different positions, XY A second reinforcing material group (for example, a second reinforcing material in an embodiment to be described later) that is arranged in a staggered manner so that a part of the reinforcing materials adjacent in a planar shape overlap and has a gap between every other adjacent reinforcing material. and the reinforcing material group 12B), provided,
In the first reinforcing material group and the second reinforcing material group, the gap formed by the first reinforcing material group and the gap formed by the second reinforcing material group deviate from the Z direction. It is characterized by being connected.

The invention according to claim 2
A method for reinforcing a resin molded body (for example, a resin molded body 20 in an embodiment described later) formed of a molten resin (for example, a molten resin 32 in an embodiment described later),
A resin-made reinforcing member (for example, a reinforcing member 10 in an embodiment described later) having a three-dimensionally arranged void into which the molten resin enters is used as a cavity (for example, a mold 30 in an embodiment described later). For example, the step of placing in the cavity 31) in the embodiment described later,
A step of moving the reinforcing member by the flow of the molten resin and disposing the reinforcing member in a merged portion of the molten resin (for example, a merged portion 33 in an embodiment described later);
With
The reinforcing member is different in at least one length in the X, Y, and Z directions orthogonal to each other,
The step of disposing the reinforcing member in the cavity includes disposing the longest side of the reinforcing member (for example, the longest side A in an embodiment described later) in a direction perpendicular to the flow of the molten resin. Features.

According to the first aspect of the present invention, the gaps between the reinforcing materials are formed in a three-dimensional manner, and the resin joining portions formed by the molten resin entering the gaps are also arranged in a three-dimensional manner. The mechanical properties of the resin junction in all directions can be increased.

According to invention of Claim 2 , a reinforcement member can be reliably arrange | positioned in the joining part of molten resin, and the mechanical physical property of a resin joining part can be reinforced stably.
Further, the flow of molten resin allows the reinforcing member to be stably transported to the resin junction without being rotated.

It is a perspective view of the reinforcement member of the resin molding of one embodiment concerning the present invention. It is a top view of the reinforcement member of the resin molding shown in FIG. It is explanatory drawing which shows the reinforcement method of the resin molding using the reinforcing member of the resin molding shown in FIG. 1 in order of a formation process. It is a figure which shows the reinforcement method of the weld line of patent document 1. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 and 2, the reinforcing member 10 of the resin molded body of the present embodiment is staggered so that a plurality of reinforcing materials 11 formed in a substantially rod shape overlap in the X direction. In this state, a first reinforcing material group 12A joined in alignment in the Y direction and a second reinforcing material group 12B formed in the same manner are provided. A gap 13 is formed between the reinforcing materials 11 adjacent to each other of the first reinforcing material group 12A and the second reinforcing material group 12B. The first reinforcing material group 12A and the second reinforcing material group 12B are stacked and arranged such that the gaps 13 of the reinforcing material groups 12A and 12B are displaced from each other in the Z direction. In FIG. 2, for the reinforcing materials 11 having different depths, the reinforcing material 11 positioned in the front row is indicated by a solid line, and the reinforcing materials 11 positioned other than the front row are indicated by a dotted line.

  As a result, the gaps 13 formed between the reinforcing materials 11 are arranged in a three-dimensional manner in a staggered state in any direction of XYZ. That is, in the reinforcing member 10, a plurality of substantially rod-shaped reinforcing materials 11 are joined in a state where the gaps 13 between the adjacent reinforcing materials 11 are staggered in a three-dimensional manner (in the X, Y, and Z directions). . Further, the reinforcing member 10 has at least one length in the X, Y, and Z directions orthogonal to each other, and the length of one side in any of the vertical, horizontal, and length is longer than the length of the other side. It has become.

  As each reinforcing material 11, for example, a resin rod formed of the same or similar material as the resin to be molded can be used. When the resin rod is used, a cylindrical resin rod or a polygonal column-shaped resin rod such as a triangular column or a quadrangular column can be used. The reinforcing material 11 preferably includes reinforcing fibers (not shown) such as glass fibers. The length of the glass fiber can be appropriately selected according to the required mechanical properties, and is preferably 10 mm or more, and more preferably 11 mm or more.

  In the embodiment shown in the figure, adjacent columnar reinforcing materials 11 constituting the first reinforcing material group 12A and adjacent columnar reinforcing materials 11 constituting the second reinforcing material group 12B are vibrated. The columnar reinforcing material 11 of the first reinforcing material group 12A and the columnar reinforcing material 11 of the second reinforcing material group 12B are bonded by vibration welding or the like.

  The reinforcing member 10 is shown as a structure in which the first reinforcing material group 12A and the second reinforcing material group 12B are laminated in two layers, but the reinforcing member 10 is not limited to two layers, and is not limited to the two layers. ) May be composed of a plurality of layers of three or more layers.

  In addition, the reinforcing member 10 is not limited to the case where the reinforcing member 10 is composed of a plurality of types of reinforcing material 11 as long as it has a three-dimensional interstitial space into which molten resin enters, and from a plurality of types of reinforcing materials. For example, a plurality of through holes may be formed in a lump-shaped resin molded body from various directions to form a three-dimensional interstitial space.

  A method of reinforcing a resin molded body in which such a reinforcing member 10 is arranged in the joining portion 33 of the molten resin 32 to improve the mechanical properties of the weld line will be described with reference to FIG.

  As shown in FIG. 3, in the method for reinforcing a resin molded body according to the present embodiment, the reinforcing member 10 is arranged on a weld line formed in a joining portion 33 of a molten resin 32 that flows in a cavity 31 of a mold 30 from different directions. Thus, the mechanical properties of the weld line are increased.

  The mold 30 of the embodiment shown in FIG. 3 has a cavity 31 shaped so that the molten resin 32 injected from the injection gates 34A, 34B provided at two locations merges at the junction 33, A weld line is formed at the junction 33 of the molten resin 32. In addition, even if there is one injection gate, the cavity 31 can be similarly applied as long as the cavity 31 has a shape that allows the injected molten resin 32 to flow after branching and flowing.

  First, as shown in FIG. 3A, the YZ plane including the longest side A of the reinforcing member 10 is oriented in a direction perpendicular to the discharge direction of the molten resin 32 discharged from one injection gate 34A. It is arranged in the cavity 31 of the mold 30. The size of the reinforcing member 10 is set so that the molten resin 32 does not leak from the gap between the mold 30 and the cavity 31.

  Here, when the molten resin 32 is discharged from the injection gates 34A and 34B, as shown in FIGS. 3B and 3C, the molten resin 32 discharged from the injection gate 34A on the side where the reinforcing member 10 is disposed is The inside of the cavity 31 flows while pushing the reinforcing member 10 with the flow front 35. That is, the reinforcing member 10 moves in the cavity 31 by the flow of the molten resin 32 injected from the injection gate 34A.

  Since the longest side A is arranged in a direction perpendicular to the discharge direction of the molten resin 32, the reinforcing member 10 does not rotate when moving in the cavity 31, and maintains the posture as it is. And move along the flow of the molten resin 32.

  Eventually, as shown in FIG. 3D, the flow front 35 of the molten resin 32 injected from one injection gate 34A and the flow front 35 of the molten resin 32 injected from the other injection gate 34B join together. When joined at 33, the reinforcing member 10 is disposed at the joining portion 33 while being sandwiched between the molten resins 32 from both injection gates 34 </ b> A and 34 </ b> B while being restricted in movement and rotating.

  Thus, since the reinforcing member 10 is pushed by the flow head 35 of the molten resin 32 injected from the injection gate 34A and moves in the cavity 31 to a position sandwiched by the molten resin 32, the resin material, the molten resin temperature Even if the molding conditions such as the mold temperature and the injection pressure are different, they are surely arranged in the joining portion 33 of the molten resin 32.

  Then, the resin molded body 20 formed by filling the cavity 31 with the molten resin 32 is molded in a state in which the molten resin 32 enters the respective gaps 13 of the reinforcing member 10 disposed in the joining portion 33. The gaps 13 formed between the reinforcing materials 11 are staggered in any direction of XYZ, that is, arranged in a three-dimensional manner, so that the molten resin 32 enters the gap 13. The weld lines formed in the merge portion 33 are not formed in a single line shape in any direction of XYZ, but are formed so as to enter each other.

  For this reason, the weld line is formed in a three-dimensional shape, and the contact area between the molten resins 32 in the joining portion 33 is greatly increased, and the mechanical properties of the weld line in the XYZ directions are greatly improved.

  As described above, according to the reinforcing member 10 and the reinforcing method of the resin molded body 20 according to the present embodiment, the resin reinforcing member 10 that reinforces the resin molded body 20 has a plurality of gaps 13 in a three-dimensional shape. Since it is provided in an intricate manner, the resin molded body 20 is molded in a state where the molten resin 32 enters the gap 13 of the reinforcing member 10 in a three-dimensional shape. Thereby, since the merge part 33 of the molten resin 32 is not aligned on a single line but is assembled in a three-dimensional shape, the mechanical properties of the merge part 33 in all directions can be increased.

  Moreover, the mechanical property of the confluence | merging part 33 improves further because the reinforcement member 10 contains a reinforced fiber.

  Further, since the reinforcing member 10 is configured by combining a plurality of reinforcing materials 11 having gaps 13 between the reinforcing materials 11, the contact area between the reinforcing material 11 and the molten resin 32 is increased and the adhesion is improved. Thus, the mechanical properties of the merging portion 33 can be increased. Further, by configuring the reinforcing member 10 using only one type of reinforcing material 11, the reinforcing member 10 can be manufactured easily and inexpensively.

  Further, the reinforcing members 10 composed of a plurality of reinforcing materials 11 formed in a substantially rod shape are alternately arranged so that a part of the adjacent reinforcing materials 11 overlap in the XY plane, and are adjacent to each other. The first reinforcement material group 12A having the gap 13 between the reinforcement materials 11 and the first reinforcement material group 12A in the Z direction are arranged at positions different from each other, and a part of the adjacent reinforcement material 11 in the XY plane shape overlaps. The second reinforcing material group 12B having the gaps 13 between the reinforcing materials 11 that are alternately arranged and adjacent to each other, and the first reinforcing material group 12A and the second reinforcing material group 12B are the first Since the gap 13 of the reinforcing material group 12A and the gap 13 of the second reinforcing material group 12B are coupled so as to be displaced from the Z direction, the molten resin 32 is provided in the gap 13 provided in a three-dimensional manner. But Merging portion 33 formed in the silicon is also formed convoluted alternately in three dimensions, it is possible to increase the mechanical properties of the joining portion 33 in all directions.

  Further, since the reinforcing member 10 includes a step of placing the reinforcing member 10 in the cavity 31 of the mold 30 and a step of moving the reinforcing member 10 by the flow of the molten resin 32 and disposing the reinforcing member 10 in the joining portion 33 of the molten resin 32. The reinforcing member 10 can be reliably disposed at the joining portion 33 of the molten resin 32, and the mechanical properties of the joining portion 33 can be reliably reinforced.

  Further, the reinforcing member 10 has at least one length in the X, Y, and Z directions orthogonal to each other, and the longest side A of the reinforcing member 10 is directed in a direction perpendicular to the flow of the molten resin 32 to be in the cavity 31. Therefore, the reinforcing member 10 can be stably conveyed by the flow head 35 of the molten resin 32 and can be surely disposed at the joining portion 33 of the molten resin 32.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
For example, in the method for reinforcing a resin molded body according to the above-described embodiment, as a method for increasing the mechanical properties of the weld line by arranging the reinforcing member 10 on the weld line, injection molding with the molten resin 32 injected from the injection gates 34A and 34B. However, the present invention is not limited to this, and the reinforcing member 10 is disposed in the mold, and the molten resin 32 is injected as shown in FIG. It can also be applied to press molding in which the reinforcing member 10 is moved by moving the fluid 32 and the reinforcing member 10 is disposed on the weld line.

DESCRIPTION OF SYMBOLS 10 Reinforcement member 11 Reinforcement material 12A 1st reinforcement material group 12B 2nd reinforcement material group 13 Space | gap 20 Resin molding 30 Mold 31 Cavity 32 Molten resin 33 Junction part 34A, 34B Injection gate A Longest side

Claims (2)

A resin reinforcing member that reinforces a resin molded body formed of a molten resin,
Consists of a plurality of reinforcing materials formed in a substantially bar shape,
The plurality of reinforcing materials are arranged in an XY plane so that a part of the adjacent reinforcing materials overlap with each other, and a first reinforcing material group having a gap between every other adjacent reinforcing materials, In the Z direction perpendicular to the XY plane, the reinforcing material is disposed at a position different from the first reinforcing material group, and is alternately arranged so that a part of the adjacent reinforcing materials overlap in the XY plane. A second reinforcing material group having a gap between the reinforcing materials to be fitted,
In the first reinforcing material group and the second reinforcing material group, the gap formed by the first reinforcing material group and the gap formed by the second reinforcing material group deviate from the Z direction. The reinforcing member is characterized by being joined together. A method of reinforcing a resin molded body formed of a molten resin,
Placing the resin-made reinforcing member having a three-dimensional intricate gap into which the molten resin enters, and in the cavity of the mold;
A step of moving the reinforcing member by the flow of the molten resin and disposing the reinforcing member at a joining portion of the molten resin,
The reinforcing member is different in at least one length in the X, Y, and Z directions orthogonal to each other,
The step of disposing the reinforcing member in the cavity includes disposing the longest side of the reinforcing member in a direction perpendicular to the flow of the molten resin.

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