JP3028615B2 - Fiber reinforced resin mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold used for molding a fiber reinforced resin using a foam core.

[0002]

2. Description of the Related Art In recent years, FRP (glass fiber reinforced thermosetting resin) products have been used for various molded articles such as outer panels of automobiles. For example, in the case of an engine hood, the molding of such a fiber-reinforced resin molded product is performed with the rigidity of the molded product,
In order to ensure strength and the like, a foamed material is inserted as a core material into a molded product and integrally molded. By using a foaming material or the like in this way, the weight of the product can be reduced and the surface quality can be improved as compared with the case where the reinforcing fiber such as glass fiber and the resin are used alone.

[0003] In the conventional RTM molding method, a resin injection port is provided on an upper mold on the back side of a product. This is because the flow of the molten resin in the mold becomes good, and the surface quality of the product is improved, so that it becomes convenient to apply the gel coat to the lower mold. When the molded product is an engine hood, the outer surface of the product is molded with a lower mold for the above-described reason. In the engine hood, as shown in FIGS. 1 and 6 to 8, the foam material 3 and the reinforcing fiber mat 2 for the back surface have an outer surface 1 formed by a lower mold 4 having a substantially planar shape, and the lower mold Since their setting positions are unknown, they must be set on the upper mold 5.

[0004]

However, in a large product such as an engine hood, a foam material and a reinforcing fiber mat are also large, and it is difficult to set them on a downward mold surface of an upper mold. . Conventionally, it is fixed to the upper mold with a gum tape or the like. However, two or more people are required, work efficiency is extremely poor, and a gum tape or the like remains in a molded product, which is not preferable in appearance.

According to the present invention, a large number of support pins are provided on an upper mold such that a locking member expands when inserted into a mold, and the large number of support pins are inserted through a foam material or a reinforcing fiber mat. It is an object of the present invention to provide a fiber-reinforced resin molding die which is easily mounted by being fixed to an upper die.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a plurality of support pins for inserting and holding reinforcing fibers and a foam material core are arranged on an upper die, and a plurality of link levers are provided at the tip of the support pins. A fiber-reinforced resin molding die provided with a drive mechanism internally provided with a mounted slide shaft and a drive mechanism for moving into and out of the recess of the upper die, and a drive mechanism for moving the slide shaft with a predetermined stroke with respect to the support pin.

[0007]

With the support pins retracted into the upper mold, a pile of the reinforcing fiber mat and the foam core is pressed against the upper mold from below, and the drive mechanism of the support pins is operated to lower the support pins. Insert through the reinforcing fiber mat and the foam core. Next, when the drive mechanism of the slide shaft is operated to depress the slide shaft,
The link lever bends at the connection portion and cuts into the foam material, thereby securely holding the reinforcing fiber mat and the foam material in close contact with the upper mold.

[0008]

FIG. 1 shows a part of a mold in a set state.
The lower mold 4 is a mold for molding the outer surface of an engine hood molded product, the upper mold 5 is a core mold, and a large number of support pins 7, which will be described in detail later, are provided in the recesses of the upper mold 5. FIG. 6 shows the back surface of the engine hood molded product, and FIG.
8 is a plan view of the foam core, and reference numeral 6 in FIG.

As shown in FIG. 2, the support pin 7 is provided with a slide shaft 8 in a hollow hole of a pipe-shaped outer cylinder 7a having a sharpened portion 7b fixed at the tip thereof. The shaft 8 is driven vertically by a driving mechanism such as an air cylinder (not shown). Support pin 7
A pair of link levers 9, 9 are provided between a support 7d attached to the sharp portion 7b of the slide shaft 7 and a support 8a at the tip of the slide shaft 8.
Each connecting portion 9a at pivotably coupled (indicated by a line of 9,9a for showing simplicity of the drawing), when the slide shaft 8 is at the top dead center L _U in FIG. 2, indicated by dashed line in extending parallel link lever 9 in the axial direction of the slide shaft 8 so, come to the bottom dead center L _D slide shaft 8 is lowered, moving connecting portion 9a of the link lever 9 is in the dotted arrow direction in the figure, As shown by the solid line, each side is opened by a distance d on both sides, and projects outward of the outer cylinder 7a from an opening 7c formed in the outer cylinder 7a. A large number of the support pins 7 are inserted through a collar provided with an O-ring in the set portion of the foam material of the upper mold 5.

Next, molding of a fiber-reinforced resin molded product using this mold will be described. With the support pins 7 of FIG. 1 retracted into the upper mold 5, a reinforcing fiber mat 1 such as glass fiber formed in a mat shape in advance is set in the lower mold 4, and the reinforcing fiber mat 2 and urethane are used. The pile of the foamed material core 3 formed in advance is supported by hand and pressed against the upper mold 5 from below. In this state, the air cylinder of the support pin 7 is operated to lower the outer cylinder 7a, and the lower cylinder 7a is inserted through the reinforcing fiber mat 2 and the foam core 3 and lowered to the position shown in FIG. next,
Bending the slide shaft 8 by operating the air cylinder of the slide shaft 8 and is pushed down from the top dead center L _U to the lower dead point L _D, the connecting portion 9a Do-shape as the link lever 9 described above, It cuts into the foam core 3 and as shown in FIG.
The reinforcing fiber mat 2 and the foam core 3 are securely held in close contact with the upper mold 5.

Next, the lower mold 4 and the upper mold 5 are closed, the air cylinder of the slide shaft 8 is turned off, and the slide shaft 8 is moved to the upper dead center L.
_After returning to the _U position, the air cylinder of the support pin 7 is turned off, and the outer cylinder 7 a is retracted into the upper mold 5. When the molten resin (resin + calcium carbonate) is injected into the mold, the molten resin penetrates the reinforcing fibers 1 and 2 to close the trace of the insertion hole of the support pin 7 and simultaneously forms a resin layer around the mold. A fiber-reinforced resin molded product is formed. Therefore, no trace of the insertion hole of the support pin remains on the molded product that has been opened and removed from the mold after the resin has hardened.

3 to 5 show various structures of the link lever 9. FIG. The structure of the connecting portion 9a using a round bar as a material can be arbitrarily selected as shown in the drawing. In the structures of FIGS. 4 and 5, since 9b and 9c further project outside the connecting portion 9a, the foam material core 3 Support becomes stronger. Since the length of the link lever 9 and the stroke of the slide shaft 8 can be arbitrarily selected, the extension d of the link lever 9 is adjusted according to the hardness or rigidity of the foam material due to the type of foam material and the difference in foaming ratio. be able to. Further, the link levers are not limited to the two left and right pairs shown in FIG.
It can be formed in sets or four sets at 90 degree intervals.

Another setting method using the above-described apparatus will be described below. The outer cylinder 7a is lowered by operating the air cylinder of the support pin 7, and the outer cylinder 7a is protruded into the mold of the upper mold 5, and the reinforcing fiber mat 2 and the foam core 3 are stacked by hand and supported by hand. Pierces the support pin 7 from
Similarly connected to the pushed down which actuates the air cylinder of the slide shaft 8 while supporting by hand slide shaft 8 from the top dead center L _U position to the bottom dead center L _D position, the link lever 9 described above At the portion 9 a, it bends into a U-shape and cuts into the foam core 3. Hereinafter, molding is performed in the same manner as described above.

[0014]

According to the present invention, the setting of the foam material core or the like to the upper mold becomes easy, and the foam material can be supported in accordance with the type of the foam material so as to be securely supported by the upper mold. Good appearance.

[Brief description of the drawings]

FIG. 1 is a sectional view of one embodiment of the present invention.

FIG. 2 is a sectional view of a support pin of the present invention.

FIG. 3 is a view showing various structures of a connecting portion of a link lever of the present invention.

FIG. 4 is a diagram showing another structure of the connecting portion of the link lever of the present invention.

FIG. 5 is a view showing still another structure of the connecting portion of the link lever of the present invention.

FIG. 6 is a plan view of the back surface of the engine hood.

FIG. 7 is a sectional view taken along line AA and line BB in FIG. 6;

FIG. 8 is a plan view of a foam core used for molding an engine hood.

[Explanation of symbols]

 1, 2 Fiber mat for reinforcement 3 Foam core 4 Lower die 5 Upper die 7 Support pin 8 Slide shaft 9 Link lever

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-101833 (JP, A) JP-A-60-224511 (JP, A) JP-A-1-253410 (JP, A) 67723 (JP, U) Japanese Utility Model 2-41912 (JP, U) Japanese Utility Model 63-116311 (JP, U) Japanese Utility Model Utility Model 53-54968 (JP, U) Japanese Utility Model 4-69126 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) B29C 45/26-45/44 B29C 33/00-33/76 B29C 70/06

Claims (1)

(57) [Claims] 1. A plurality of support pins, which are inserted into and held by a reinforcing fiber and a foam material core, are disposed on an upper mold, and a slide shaft having a plurality of sets of link levers attached to the tip thereof is provided inside the support pins. A fiber-reinforced resin molding die, further comprising a driving mechanism for moving into and out of the recess of the upper die, and a driving mechanism for moving the slide shaft with a predetermined stroke with respect to the support pin.