JPH03219943A - Die for fiber reinforced resin - Google Patents

Abstract

PURPOSE:To stabilize the mechanical strength of a molding by reducing that fibers are put between mold registering surfaces to the utmost by providing a return means pushing back the fibers invading between the mold registering surfaces to a cavity. CONSTITUTION:A tongue part 25 is held between the mold registering surface 7 of an upper mold 1 and the mold registering surface 13 of a lower mold 9. A top part 24 pulls the tongue part 25 and further moves until a guide part 26 comes into contact with a weir 91 while pushes back a molding material against the pressing force allowing the molding material to invade between the mold registering surfaces 7, 13 under pressure. In this state, the long side 242 of the top part 24 becomes a surface arranging state with respect to the forming surface of the cavity 3 of a lower mold 9 and the cavity 3 is formed into a planning shape state. by providing the mold registering surfaces 7, 13 at a position separated from the cavity by inclined surfaces 5, 11, the molding material is further pushed back by a return means to reduce that fibers are put between the mold registering surfaces 7, 13 to the utmost and the mechanical strength of a molding is stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mold for fiber-reinforced resin, and particularly to a mold for flow molding an arm used in an automobile suspension system.

[Conventional technology]

As shown in FIG. 11, an arm 101 used in a conventional automobile suspension system is made of glass in a matrix (base material) of thermosetting resin such as unsaturated polyester resin or thermoplastic resin such as polybutylene. It is manufactured by flow molding a molding material mixed with fibers such as , carbon, or Kepler (trade name). This arm 101 is designed to press a heated molding material with an upper mold 103 and a lower mold 105 to obtain a molded product with precision and high mechanical strength.

When the molding material is molded using the two-part mold described above, as shown in FIG. 12 (cross-sectional view taken along line nn in FIG. 11),
In a portion of the arm 101 having a simple shape (rectangular cross section), the occurrence of PL lines, flashing, etc. is prevented by using a mold structure in which the upper mold 103 fits into the lower mold 105. In addition, as shown in FIG. 13 (mm-m sectional view in FIG. 11), in the boss portion of the arm 101 formed in a drum-shaped cross section, in order to eliminate undercuts in the molded product, the mold mating surface is The mold structure is such that a part becomes the center of the molded product.

[Problem to be solved by the invention]

However, in a mold structure where the mold mating surface is the center of the molded product, as shown in Figure 14 (enlarged view of part A in Figure 13), the lower mold and upper mold are separated during molding pressurization. Continuous fibers may be caught between the mold matching surfaces, causing damage to the fibers. If this damage occurs, the mechanical strength of the molded arm will be significantly reduced.

In order to prevent the fibers from being caught between the mold mating surfaces, there is a method of using a core or using two or more split molds to change the mold mating surfaces. However, these methods require complicated mold structures and cannot be used in mass-produced products due to their durability. Also, JP-A-63-5018
In the method disclosed in Publication No. 7, in which a rubber sheet or tape is wrapped around a fiber bundle to prevent the fibers from being caught between the molding surfaces, the number of man-hours required for wrapping the rubber sheet or tape around the fiber bundle is In addition, in some cases, it also requires man-hours to remove the sheet or tape after molding, so the productivity of the arm is not very good.

Therefore, the present invention aims to reliably prevent the fibers from being caught between the molding surfaces by pushing back the fibers that enter between the molding surfaces.

[Means to solve the problem]

Therefore, in the fiber reinforced resin mold of the present invention, a molding material is placed in a cavity formed by a lower mold and an upper mold, and the molding material is pressure-molded. , a return means composed of a holding part held between each mold matching surface of the mold and expandable and retractable in the direction of the cavity, and a main body part having a substantially trapezoidal cross section connected to the holding part; The short side of the main body is connected to the clamping part,
The pair of opposing inclined sides are in contact with inclined surfaces formed on the mold matching surfaces of the mold, and the long side faces the cavity.

[Effect]

After placing the fiber-reinforced resin molding material in the cavity,
When mold clamping is started, when the main body portion of the return means comes into contact with the inclined surface of each mold, the holding portion is held between the lower mold and the upper mold in succession. Even after this clamping part is clamped between the lower mold and the upper mold, as one of the molds moves, the main body of the return means will be affected by the component force in the direction of the cavity that acts on the inclined surface of the mold. By this, the fibers protruding between the mold mating surfaces are pushed back into the cavity against the tensile reaction force of the clamping part.
This prevents the fibers from being caught between the molding surfaces.

〔Example〕

Hereinafter, the present invention will be described in detail based on the accompanying drawings.

The drawings from FIG. 1 to FIG. 10 relate to an embodiment of the invention. Reference numeral 1 shown in FIG. 1 is an upper mold. In this upper mold 1, an arm used in an automobile suspension system is made of glass, carbon, or Kepler (trademark) matrix (base material) of thermosetting resin such as unsaturated polyester resin or thermoplastic resin such as polybutylene. A cavity 3 is formed for flow molding a molding material mixed with fibers such as (name). At the edge of the upper mold 1 around the cavity 30, an inclined surface 5 that is continuous with the mold matching surface 7 is formed for contacting with a return means to be described later.

FIG. 3 shows the lower mold 9. A cavity 3 is also formed in this lower mold 9, and on the edge of the lower mold 9 around this cavity 3, an inclined surface 11 for contacting a return means to be described later is a continuous surface with a mold matching surface 13. It is formed of. The inclined surface 11 and the mold matching surface 13 have guide grooves 21, 22, 23, 3 extending in the normal direction of the cavity 3.
1.32.33.41.42.43 and 51 are formed.

Return means 20.30 that fit into these guide grooves 21 to 5
．． 40, and 50 are shown in FIG. The return means 20 to 50 are made of heat-resistant synthetic rubber, and have a top portion (body portion) 24, 34, adjacent to the cavity 3.
44.54, a tongue part (clamping part) 25.35.45.55 held between the mold matching surface 7 and the mold matching surface 13,
Guide portions 26, 27, 28 inserted into guide grooves 21 to 51
．． 36.37.38.46.4--7.48.56.

Next, the return means 20 will be explained in detail using FIGS. 4 to 6. 4 is a sectional view taken along line IV-IV in FIG. 2, FIG. 5 is a sectional view taken along line V-V in FIG. 2, and FIG. 6 is an enlarged view of section A in FIG.

The top portion 24 of the return means 20 has a substantially trapezoidal cross section,
The inclined side 241 contacts the inclined surface 11 of the lower mold 9, and the opposing inclined side 242 contacts the inclined surface 5 of the upper mold 1. Further, the short side 243 is connected to the expandable tongue portion 25 . Furthermore, the long side 244 faces the cavity 3 and serves to push back the molding material that comes into direct contact with the molding material and penetrates between the mold mating surfaces 7.13. A metal block 29 is embedded in the guide section 26 of the return means 20 to improve the mechanical strength of the guide section 26.

Next, the functions and effects of the embodiment of the present invention will be explained using mainly FIGS. 7 to 9.

FIG. 7 is a cross-sectional view taken along the line ■-■ in FIG. 3 in the initial state of mold clamping, and FIG. 8 is a cross-sectional view of FIG.
−■ It is a sectional view. Further, FIG. 9 is a cross-sectional view taken along the line ■-■ in FIG. 3 in the initial state of mold clamping, and FIG. 10 is a cross-sectional view taken along the line ■-■ in FIG. 3 in the completed mold clamping state.

After the molding material of fiber-reinforced resin is provided in the cavity 3, clamping of the upper mold 1 and the lower mold 9 is started. As the upper mold 1 descends, pressure is applied to the molding material. As the upper mold 10 further descends, as shown in FIG. The force initiates movement in the direction of cavity 3. At this time, as shown in FIG. 9, the guide portion 26 of the piece 24 that fits into the guide groove 21 is separated from the weir 91 extending in the guide groove 21, so that the piece 24 is connected to the cavity 3. It is possible to move in the direction.

Further, the tongue portion 25 is adhesively fixed to the mold matching surface 13 of the lower mold 9.

After this, as shown in FIG.
It is held between the mold matching surface 7 of the lower mold 9 and the mold matching surface 13 of the lower mold 9. The top part 24 is connected to the tongue part 25.
is pulled, and the molding material is pressed against the mold mating surface 7.
．． While pushing back the molding material against the pressing force that tries to enter the molding material 13, the guide portion 26 moves until it comes into contact with the weir 91, as shown in FIG. In addition, in this state,
The long side 242 of the piece 24 is connected to the cavity 3 of the lower mold 9.
The surface is aligned with the forming surface, and the cavity 3 is formed in the designed shape.

Thus, in this example, the inclined surface 5.11 allows
The mold matching surface 7.13 is provided at a position distant from the cavity 3, and the molding material is further pushed back by the return means 20, so that the fibers are moved to the mold matching surface 7.1.
3, and the mechanical strength of the molded product can be stabilized.

In addition, since the return means 20 is made of an elastic body made of synthetic rubber, it has excellent compatibility with the inclined surface 5.11, so when moving the top part 24 in the direction of the cavity 3, As a result of being able to prevent fibers and resin from being caught between the surface 5.11 and the frame portion 24, the generation of PL can be prevented and the surface texture of the molded product will be clean, resulting in excellent design.

Further, the mold clamping serves as an acting force that causes the piece portion 25 of the return means 20 to slide. As a result, this embodiment can be manufactured very cost-effectively, since no drive is required for independently moving the return means 20.

In addition, since there is no need to provide a core etc., this embodiment
The mold structure is divided into two parts, which is extremely simple, making it easy to obtain a mold structure with multiple cavities, making it suitable for molding mass-produced parts.

Furthermore, by forming the inclined surface 5.11 deeply (large inclination angle), the contact area between the upper mold 1, lower mold 9 and the molded product is reduced, making it extremely difficult to remove the molded product after thermosetting. becomes easier and improves productivity.

Although specific embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and includes various embodiments within the scope of the claims. .

In the embodiment, the tongue portion 25 is attached to the mold light surface 13 of the lower mold 9.
However, the adhesive fixation is abolished and the tongue portion 25 is fixed so that the inclined side 242 contacts the inclined surface 5 after the tongue portion 25 contacts the molding surface 7 of the upper mold 1. The thickness may be changed. In this case, the tongue portion 25 is held between the molding surface 7 of the upper mold 1 and the molding surface 13 of the lower mold 9 before the top portion 24 starts moving.

Further, although the tongue portion 25 and the top portion 24 are integrated, the tongue portion 25 and the top portion 24 may be connected by a spring means.

〔Effect of the invention〕

As described above, in the present invention, by providing a means for pushing back the fibers that have entered between the mold matching surfaces into the cavity, it is possible to minimize the possibility of the fibers being caught between the mold matching surfaces, and to mold the fibers. The mechanical strength of the product can be stabilized.

In addition, since the mold clamping acts as an acting force that slides the main body of the return means, there is no need to provide a drive device that independently moves the return means, and the structure of the mold is extremely simple. Embodiments of the present invention are shown in which Fig. 1 is a perspective view of the upper mold, Fig. 2 is a perspective view of the return means, Fig. 3 is a perspective view of the lower mold, and Fig. 4 is a cross section of the return means. IV-I in Figure 2 showing
V sectional view, FIG. 5 is the V in FIG. 2 showing the guide part of the return means.
-V sectional view, Fig. 6 is an enlarged sectional view of part A in Fig. 2 to clarify the detailed shape of the return means, and Fig. 7 is - of Fig. 3 showing the position of the return means in the initial state of mold clamping. 3 is a sectional view, and FIG. 8 is a sectional view taken along line 2--2 in FIG. 3, showing the position of the return means in the mold clamping completed state. Figure 9 is a sectional view taken along the line ■-■ of Figure 3 showing the arrangement of the return means and weir in the initial state of mold clamping;
FIG. 0 is a cross-sectional view taken along the line ■-■ in FIG. 3, showing the contact relationship between the return means and the weir in a state where the mold clamping is completed.

Moreover, FIGS. 11 to 14 show the prior art, and the first
Fig. 1 is a sectional view showing a molded state of an arm used in an automobile suspension system, Fig. 12 is a sectional view taken along nn in Fig. 11, Fig. 13 is a sectional view taken along mm in Fig. 11, and Fig. 14 is a sectional view taken along line nn in Fig. 11. The figure is an enlarged sectional view of section A in FIG. 13.

1 3 0 4 5 41 42 43 upper mold Cavity slope Mold matching surface Lower mold slope Mold matching surface return means ]Ma part (body part) Tongue part (pinching part) Slope side Slope side short side 244...Long side

Claims (1)

[Claims] (1) In a fiber-reinforced resin mold in which a molding material is placed in a cavity formed by a lower mold and an upper mold, and this molding material is pressure-molded, the molding material is placed at each mold mating surface of the mold. A return means is comprised of a holding part that is held and is expandable and retractable in the direction of the cavity, and a main body part having a substantially trapezoidal cross section that is connected to the holding part, and the short side of the main body part of the return means is connected to the holding part. A mold for fiber-reinforced resin, characterized in that a pair of connected and opposing inclined sides contact an inclined surface formed on a mold matching surface of the mold, and the long side faces a cavity.