JPS59215822A - Molding method of fiber-reinforced plastic - Google Patents

Abstract

PURPOSE:To manufacture a molded fiber-reinforced plastic by a method wherein an uncured plastic which is reinforced with long filament fibers is wound around a plastic cylinder which is reinforced with short filament fibers with the long filament fibers arranged to be inclined against a generating line of the plastic cylinder and this plastic substance is put in dice and compressed and molded by punching. CONSTITUTION:Around a plastic cylinder which is reinforced with short filament fibers, a plastic matrix and long filament fibers, which are inclined against a generating line of the plastic cylinder, are wound to obtain a material 1. This material 1 is enclosed in dice 2,3. When a top punch 5 and a bottom punch 6 are shifted downward and upward respectively to compress the material 1 while the dice are vertically compressed not to open, the material 1 is deformed to fill a space 4 in the dice and molded so as to make the long filament fibers 1b envelope the short filament fiber reinforced plastic part 1a. Then the dice temperature is controlled in accordance with the physical properties of the synthetic resin to complete the curing and the dice are opened for demolding a molded product A.

Description

DETAILED DESCRIPTION OF THE INVENTION Conventional methods for molding fiber-reinforced plastics using long fibers include filament winding, continuous drawing, and continuous particle layer method. However, with any of these methods, it is difficult to mold a molded product with a complicated shape.

For this reason, when a float has a complex shape and a long fiber arrangement along the tooth profile is desired on its surface, for example, on the tooth surface, plastic is wrapped around the outer periphery of a cylindrical fiber-reinforced plastic, integrated, and then cut. It was processed and manufactured.

This method not only has the disadvantage of requiring a large number of steps, but also has the disadvantage that the long fibers, which are effective in terms of product strength, are cut at important parts, halving the advantages of long fiber-reinforced plastics.

Further, injection molding is possible if it is simply a short #Pj fiber-reinforced plastic, but the blending ratio of fibers is low. Furthermore, a method of cutting rod-shaped short-cultivated fiber-reinforced plastics has also been adopted, but the strength of the molded product is lower than when using long fibers.

The present invention was proposed in order to eliminate such drawbacks, and the present invention is made of a material in which short fibers are arranged with a synthetic resin as a matrix. The uncured material with the long fibers and the matrix is pressurized with a punch in a closed mold so that the long fibers with a circumferential component maintain tension at the outer periphery of the molded product. The present invention relates to a method for molding a four-fiber reinforced plastic, characterized in that after molding, the temperature of the mold is controlled to complete the curing reaction of the material.

In the present invention, as described above, on the outer periphery of an easily moldable raw material made of a cylindrical body formed from a material in which short fibers are arranged with a synthetic resin as a matrix, the cylindrical body is inclined with the generatrix of the cylindrical body. It uses a material with long fibers and a matrix, and as a result, it is possible to use a stable, high-quality material with few internal voids, and the quality of the final product can be improved. Moreover, by arranging long, steep fibers having a circumferential component on the outer periphery of the material, the tensile and torsional strength of the molded product in the circumferential direction can be increased.

Furthermore, according to the present invention, there are short fibers inside which have better fluidity than long fibers.
Because the material in which the fibers and matrix are arranged is compression molded in a mold, products with complex shapes and high fiber content can be manufactured with high precision, and the material yield is high.

Furthermore, according to the present invention, long fibers are used only in the vicinity of the surface where the strength and physical properties of the fiber material itself are desired to be most effectively exhibited, and short fibers, which are cheaper than long fibers, are arranged in the inner part. High quality molded products can be obtained at low cost.

The present invention will be described below with reference to the illustrated embodiments.

Figures 1 to 6 show the case where the present invention is applied to the molding of a spur gear tA), in which a long cylindrical short V&#, a plastic matrix is formed on the outer periphery of the reinforced plastic part (1α) by a known method. The fibers used include inorganic fibers such as carbon, glass, metal, and ceramic; Various bond fibers such as organic fibers such as Admirad type, filament fibers, and whisker fibers are applied. On the other hand, synthetic resins can be freely selected regardless of whether they are thermoplastic or thermosetting, but depending on the required physical properties of the final product, molding method, cost, etc.
For example, epoxy resin, unsaturated polyester, vinyl ester resin, etc. are used. Also, at the material stage,
Depending on the type of resin, it may be used at the semi-cured B stage, or it may be used to maintain appropriate fluidity by adding a thickener, or it may be used to maintain appropriate fluidity by adding a stabilizer or curing accelerator. , a stabilizer, and a hardening accelerator S (rho cutting) are added as necessary.

(21 (31 is an upper and lower mold having a gap (4) formed in the shape of the tooth profile of the spur gear (~), and as shown in Fig. Enclose the month (1),
Upper mold (2) and lower mold! +rl! ! (3) While pressurizing the upper and lower punches vertically to prevent them from opening, dynamic pressure is applied downward with the upper punch (5) and upward with the lower punch (6), causing the material (1) to deform and form the mold. Filling the voids (1) inside, it becomes a state in which a spur tooth is molded as shown in Figure 2, and the short fiber reinforced plastic part (1h) is molded with long fibers (1h). In this state, the mold temperature is controlled according to the physical properties of the synthetic resin to complete curing, and the mold is opened to take out the spur gear tAI as a molded product.

At this time, the long fibers (IC) on the surface of the spur gear (N) are molded without slack in each part, as shown in FIG. 4, and are wrapped around the short fibers (1d).

This is effective in increasing the tooth strength in the spur gear as a molded product, and also in other parts.
1h) exhibits its characteristic tensile strength, and the spur gear I
It is effective in improving the strength of AJ.

In this way, in synthetic resin molding using long fibers, it is necessary to mold the long fibers without sagging, and to ensure that the direction of the bonding fibers acts effectively against stress within the molded product.

Therefore, it is desirable for the long fibers to be molded in a constant state of tension during all steps and all parts of the molding of the spur gear+AI, from the viewpoint of molding and stable arrangement of the fibers.

The tension or sag during forming of the long fibers (1h) on the surface of the material (1) shown in Figure 5 is determined by the diameter of the material, the tooth thickness of the gear, the outer diameter of the gear, the tooth module, etc., as well as the shaping. This is due to the slippage of the long fibers inside the mold, that is, the physical properties of the long and short fibers and the matrix, molding temperature, molding speed, etc. Therefore, it is necessary to set it according to the shape of the molded product, the degree of material hardening, and molding conditions. .

Each of the conditions described above can be determined with the required accuracy that does not pose a problem in practice. In addition, in Fig. 5, 4Z of long fiber (1b)
Regarding the fact that j f) approaches the horizontal, it is mainly due to
．． There is a limit to the smooth movement of the long fibers during molding, depending on the viscosity of the lJTux, the length of the fibers, and the tensile strength of the fibers, and it is necessary to set the inclination angle to be higher than the limit.

Figure 7 shows an example in which a long stationary fiber (IA') having an opposite slope is arranged inside the inclined long @ fiber (1h) in the material (1), and the long stop fiber (IA') with the opposite slope is arranged at the tooth profile part (α) in the spur gear. In principle, the fibers are arranged as shown in (1'α) (1'A') in FIG.

8iW 101■ is a cylindrical body (
The molded product tBl has a large diameter cylindrical part td+ connected to both ends of the 7-lunge IC+, and the Choshu fibers on the surface are (Il).
b) Arranged as shown in (11)5'>.

Fig. 11 and Fig. 12 show a bevel gear +C+ molded in the same manner as in the above embodiment, and the inner surface has a short fiber-reinforced plastic part (21α), and the outer peripheral surface has long fibers (not shown). Arranged.

In Figure 8, the long fibers with different inclination directions are lunar (
Although two layers are arranged around the outer periphery of 1), six or more layers can be arranged. Increasing the number of layers is also effective in view of the fact that during compression molding, the inner short fibers and matrix protrude to the outer surface in a manner that expands the bundle of long fibers on the outer periphery.

Further, it is possible to combine a plurality of materials for the long fibers and the short fibers themselves, and it is also possible to combine the materials for the long fibers and short fibers. The matrix can also be changed accordingly. Further, the short shoe part may be made of only synthetic resin, and various fillers may be added thereto.

Further, in the above embodiments, a mold that can be opened and closed vertically is shown, but the opening and closing directions can be arbitrary. In addition to the upper and lower punches, it is also possible to press with a separate punch from the lateral direction to facilitate local machining.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various ways without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

1 and 2 are longitudinal sectional views showing the steps of an embodiment of the method for molding fiber-reinforced plastics according to the present invention, 3C is a perspective view of a molded product molded by the same method, and FIGS. Fig. 5 is a perspective view and longitudinal cross-sectional view of each material, Fig. 6 is a partially enlarged view of a molded product formed by the method of the present invention, and Figs. 7 and 8 are perspective views of other materials, respectively. Also a vertical cross-sectional view,
FIG. 9 is a partial perspective view of a molded product molded by the method of the present invention, FIG. 10 is a perspective view of another molded product molded by the method of the present invention, and FIGS. 11 and 12 are views of the invention, respectively. FIG. 7 is a perspective view and a vertical cross-sectional view of still another molded product molded by the method of FIG. (1)...-Material, (1α)...Short fiber reinforced plastic part. (xh) (tb') (Hb) (41A')...Long fiber, (2)...Upper mold, (3)...Lower mold, (5
)...Upper punch, (6)...Lower punch. Sub-agents: Patent attorneys, 2 persons who do not have important documents 95 Figure 1 Figure 3 Figure 2 Figure 4 Figure 70 Figure 9 Cover Figure 10 Figure 11 Figure 127 Procedural amendment August 11, 1980 Commissioner of the Patent Office Wakasugi □ Ka 1, Indication of the case 1982 Patent Application No. 90588 2, Name of the invention Textile AUIj Invention method for molding plastics 3, Relationship with the person making the amendment Patent applicant name (620
) Mitsubishi Heavy Industries, Ltd. 4, sub-agent 5, date of amendment order Showa (issued in March 2013) El (
Shipping date: 16, Subject of amendment: Specification 2, Drawing 7, Contents of amendment: (1) "Claims" in the specification is amended as follows. ``A cylindrical body made of a material in which short fibers are arranged with a synthetic resin as a matrix, and an uncured material having long fibers and a matrix arranged at an angle with respect to the generatrix of the cylindrical body is placed around the outer periphery of a cylindrical body made of a material in which short fibers are arranged with a synthetic resin as a matrix. Pressure is applied with a punch in the mold,
A method for molding fiber-reinforced plastics, which comprises molding so that long fibers having a circumferential component remain in tension at the outer periphery of the molded product, and controlling the mold temperature to complete the curing reaction of the material. J(2) page 2, line 16,
Correct "cylindrical body" in line 7 of page 3 and line 8 of the same page to "cylindrical body". (3) Correct “cylindrical columnar body” in line 17 of page 2 to “cylindrical body”. (4) In the first line of the 31st line, “after molding,” is replaced with “forming,”
I will correct it. (5) Correct “placed” in line 17 of page 3 to “mixed”. (6) In the 12th line of the 4th auto, amend "Use the above" to "Use the above." (71, 4m, lines 13-14 “Admirad type”
is corrected to "aramid type". (8) First, "forming method" in line 17 of the 4th text was corrected to "formability." (9) 2JW 53M 2nd and 3rd lines, 1 Stabilizer, . . . state, and delete ". (10) “(la)” for r(lb)J in the 12th line of the 5th Tei
I will correct it. (11) “The long fibers (1c) on the surface are” on page 5, line 17.
"Long fibers (LC) (LD) on the surface and 111 sides are"
I will correct it. 02) Correct "Re, cover the short fiber (1d)" in the 19th line of the 5th Tei to "Neru." (13] 2rS 7 If 9th line 0) r(1a
)(] b) Correct J as r(x a)(1b)J. a 滲 "Cylinder (b)" on page 7, line 10 is changed to "Cylinder (
b)”. 05) Page 9, lines 2 to 4, “Figure 4 and...
. . . partial enlarged view," will be corrected as shown below. ``Figure 4 is a partially enlarged view of a molded product molded by the method of the present invention, Figures 5 and 6 are a slope view and a vertical cross-sectional view of the material, respectively.'' Figure 7 in the drawings is as attached. I will correct it.

Claims (1)

[Claims] 111, an uncured material in which long fibers and a matrix are arranged on the outer periphery of a cylindrical columnar body made of a material roughly arranged with a synthetic resin as a matrix is closed. The material is pressurized with a punch in the formed mold so that the long fibers having a circumferential component maintain tension at the outer periphery of the molded product, and then the mold temperature is controlled to cause the curing reaction of the material. A method for molding fiber-reinforced plastic.