JPH0126430Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is applicable to fiber-reinforced plastics (FRP).
This invention relates to a molding device, and is particularly designed to prevent fibers from being caught in the split outer mold.

(b) Prior art and its problems Traditionally, bellows has been used to form a wrapped layer of matrix resin-impregnated fibers around the outer periphery of an inner mold, cover the wrapped layer with a split outer mold, clamp the mold, and perform heat molding. This is done in the molding of cylindrical bodies, etc.

Generally, the split pieces of the split outer mold are split into tapered fits to each other in order to ensure firm and reliable tightening when assembled, but in FRP molding equipment, the inner mold There is a problem in that the resin-impregnated fibers wound around the mold tend to get caught in the tapered surface, and the fibers may be cut by mold clamping, or the fibers may be disturbed even if they are not cut.

(c) Solution to the problem In order to solve the above problem, this invention inserts a cylindrical rubber mold along the mold surface into the inner surface of the divided piece, and inserts the rubber mold into the inner surface of each divided piece. It has a partially connected configuration.

With this configuration, when disassembling the divided pieces,
That is, when each divided piece is moved in the radially expanding direction or the radially contracting direction, the rubber mold partially connected to the inner surface of each divided piece expands and contracts accordingly. The rubber mold also prevents the fibers from getting caught in the gaps between the divided pieces.

(d) Example As shown in Figs. 1 and 2, the outer mold 1 of this invention is divided into eight parts in the length direction, and each divided piece 2, 2' is assembled into eight pieces. A cylindrical rubber mold 3 is inserted along the inner surface, and a portion of each divided piece 2, 2' and a portion of the rubber mold 3 are bonded and integrated.

Note that although the illustrated dividing plane is formed so that the opposing surfaces are parallel, it may be divided by a commonly known tapered plane.

When each of the above divided pieces 2, 2' is moved outward, the distance between the pieces 2, 2' increases, so
Rubber mold 3 also stretches. The outward movement of the dividing pieces 2, 2' is permitted within the elastic limits of the rubber mold 3.

FIG. 3 shows another embodiment, in which engaging protrusions 5 are formed on the outer periphery of the rubber mold 3 in correspondence to each divided piece 2, 2', and provided on each divided piece 2, 2'. It is integrated into the engagement recess 6.

In any of the above embodiments, if the wrapped layer 7 of matrix resin-impregnated fibers is formed around the outer periphery of the inner mold 4, and each divided piece 2, 2' is covered with the outer periphery,
The rubber mold 3 contracts and the inside of each divided piece 2, 2',
That is, it comes into contact with the winding layer 5 along the inside of the outer mold 1 and clamps the mold. In this case, since the gap between each divided piece 2, 2' is covered by the rubber mold 3, the fibers of the wrapped layer 7 are not caught.

(d) Effects As described above, this invention can eliminate the risk of fibers getting caught in the gaps between the divided pieces by providing the rubber mold on the inner surface of the divided pieces.

Further, since each divided piece of the cylindrical rubber mold is partially connected to the inner surface, the cylindrical rubber mold expands and contracts in accordance with the movement of the divided mold in the radial direction. For this reason, the rubber mold separates from the wrapped layer due to the disassembly of the split mold, and the rubber mold exerts a tightening force on the wrapped layer due to the combination of the split molds.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted longitudinal sectional front view of an embodiment, FIG. 2 is a longitudinal sectional side view of the same, and FIG. 3 is a sectional view of another embodiment. 1... Outer mold, 2, 2'... Divided piece, 3...
Rubber mold, 4...Inner mold, 5...Engagement protrusion, 6...Engagement recess, 7...Wrapping layer.

Claims (1)

[Claims for Utility Model Registration] (1) In a fiber-reinforced plastics molding apparatus having an inner mold and a split outer mold for molding matrix resin-impregnated fibers formed on the outer periphery of the inner mold, each split piece of the split outer mold A molding device for fiber-reinforced plastics, characterized in that a cylindrical rubber mold is inserted into the inner surface of the fiber-reinforced plastics, and the rubber mold is partially bonded to the inner surface of each divided piece. (2) The fiber-reinforced plastics molding apparatus according to claim 1, wherein the rubber mold is connected to each divided piece by partially adhering it. (3) A utility model characterized in that an engaging projection is formed on the outer circumferential surface of the rubber mold, and the divided pieces are partially joined by engaging the engaging projection in an engaging recess provided on the inner surface of each divided piece. An apparatus for molding fiber-reinforced plastics according to claim 1.