JPS6025713A - Method of molding fibre-reinforced plastic - Google Patents

Abstract

PURPOSE:To obtain a molded item that has few voids and a higher fiber content and that does not require the removal of burr, by placing a specific material in molds, pressing it by punches to mold it into the intended shape, and controlling the mold temperature to cure it. CONSTITUTION:A material 2 having a prescribed through-hole 2c that comprises a plastic matrix that is partly hardened and glass fibres or the like is placed in molds 3, 4 having a space 8 corresponding to the shape of the intended item, then the molds 3, 4 are closed, and the through-hole 2c is fitted onto a hole molding shaft 7. The material 2 is pressed longitudinally by an upper punch 5 and a lower die 6 to allow the material 2 to fill the space 8 so that an item is molded that has a through-hole. Thereafter, the mold temperature is controlled to complete the hardening of the plastic to obtain a final molded item of a fibre reinforced plastic such as a gear, pulley, etc.

Description

Detailed Description of the Invention Various molding methods using fiber-reinforced plastics are currently being used, but for products with internally penetrating circumferential holes such as gears and pulleys, molding methods with a high fiber content are required. However, an efficient method for molding fiber-reinforced plastics that effectively utilizes long fibers has not yet been realized.

For example, injection molding is a method for molding fiber-reinforced plastic deck, which is highly effective in terms of productivity and molding of complex-shaped parts, but pure fiber and +Jt plastics are limited to short fibers and are usually The content is less than 60°C, and long fibers cannot be effectively used in molded products.

The present invention was proposed in order to solve these problems.The present invention has been proposed in order to solve these problems. After the material is placed in a closed mold having a gap that fits into the shaft hole forming shaft and immediately corresponds to the shape of the molded product, the material is pressed with a punch from the direction of its continuous cross section. A method for molding fiber-reinforced plastics, which comprises filling the voids with the same material, molding it into a molded product having a through hole inside, and then controlling the mold temperature to complete curing of the plastic. It is something.

In the present invention, as described above, a continuous cross-section molded with a predetermined through hole made of VL fiber molded in a semi-hardened state with a plastic matrix is used, and the same material is fitted into the shaft for forming the shaft hole. Then, the material is placed in a closed mold having a void corresponding to the shape of the molded product, and then the same material is pressed from the continuous cross-sectional direction with a punch to fill the void,
The molded product is molded into a molded product having a predetermined through hole inside, and then the mold temperature is controlled to harden the plastic as the matrix.

Therefore, according to the present invention, when molding a delicate reinforced plastic molded product, the shaft hole portion can be molded at the same time, and as described above, the fibers can be formed into a semi-hardened state of the plastic matrix (IJ lux) and the first predetermined shape can be formed. By using a material with a continuous cross-section having through-holes, a fiber-reinforced plastic molded product with a high fiber content, that is, excellent strength and various other physical properties, and having an axial hole is molded.
A homogeneous material is constructed by employing the male part extraction method for the /A7M fiber part and the filament winding method for the long fiber part, which solves the problems in molded products that are one of the problems in bonded reinforced plastic molding. The occurrence of voids is reduced. In addition, this N1', long fiber, short ff? By selecting the type of fiber material, the length Il+-', the arrangement of the fibers, and the IJ Knox silk combination, the molded product can be changed to:
You can have flexibility in setting prices.

In addition, according to the present invention, the thin plastic book molded product is molded in a closed mold, so that the process of removing the burr from the burr can be carried out with fine sand, resulting in a high yield of interest.

In addition, compared to injection molding, molded products with high fiber content and effective use of long fibers can be formed.

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 (, ++) which has a boss (Jsu') v shaft hole shaft hole h) and has teeth (]C) on the outer periphery. An example is shown.

(2) is made by molding the fiber into a semi-hardened state in a plastic matrix, and has a short male part (2α) on the inner periphery, a long fiber part (2α) on the outer periphery, and the innermost part (2α) in the center. A cylindrical rope material with a through hole (2C) that is slightly larger in diameter than the axial hole, and the long fiber part (2h) has two layers with different slopes (2h1) < 2h.
2).

The types of IN fiber of the above material include carbon, glass, metal,
Inorganic materials such as ceramics, organic fibers such as aramid fibers, and various whiskers are used.

On the other hand, Plusbootsk as a matrix is thermoplastic,
Although thermosetting resins can be freely selected, depending on the required physical properties, moldability, cost, etc. of the molded product, for example, epoxy resin,
Unsaturated Ht reester, vinyl ester resin, etc. can be used.

In addition, depending on the type of resin, the material stage may be used at the semi-cured B stage, or it may be used with a thickener added to maintain appropriate fluidity, and in both cases, stabilizers, curing accelerators, etc. are required. Add accordingly.

Figures 1 and 2 show the forming process of the spur gear (1), where (3) is the upper mold, (4) is the lower mold, (5) is the hollow cylindrical upper punch, and (6) is the molding process of the spur gear (1). is a hollow cylindrical lower punch, (7)
is a shaft hole forming shaft inserted into each of the punches (516);
(81 is a spur gear forming gap formed between the upper and lower molds (3) and (4). While closing both molds (3) (41), insert the @b hole forming shaft (7) into the through hole (2C) of the material (2+), and insert the upper punch (5) (see Figure 1). Lower punch (
6) Press from above and below. At this time, internal explosion f4! details(
2 is long υ... Compared to snoring 1 part (2h), flow 11+ el
Since it has excellent properties, a force for expanding the internal upward long twill male portion (2/I) is used for the first time to fill the void (8) and form a molded product having an axial hole.

(See Figure 2) After that, the mold temperature was controlled to 1 lJ according to the physical properties of the synthetic resin constituting the matrix of the material (21) to complete curing, and the molded product was removed using the mold. The shaft for forming the shaft hole (7) is made movable by itself, and when the final product spur gear J17. It is intended to do so.

Note that FIG. 4 shows the orientation of the long fibers (2b) on the surface of the spur gear (11) when molded using the material (2).

Figure 7 shows a pulley (9) formed by the method of the present invention.
The boss part (9a) has an axial hole (9b), and the coaxial hole (
A keyway (9C) is provided in a part of 9b). 00
) is a wood (1(la)) for forming the pulley (9).
is the inner t (11 short bar 1f part, (lQ7) & ↓ outer circumference Nagabayashi dark blue part, (IOC) is the A-groove (9) on the inner peripheral surface of the through hole.
'? ) is wider than the corresponding concave groove (9C). When forming the pulley (9), a protrusion is provided in the part corresponding to the key groove of the shaft hole forming shaft (7), and four parts are provided in the upper and lower punches (51 (6)) in the part corresponding to the key groove. will be established.

FIG. 9 shows a boss portion 01) having a spline (Jla) of a pulley formed by the method of the present invention.
0 Figure 1o[: 11+sq is the previous %! ,': Indicates the mold structure when molding tin line (+1+7).
The A-A section ir + I Wi; in the figure shows the part corresponding to the B-B section in Fig. 6, where 021 is the upper mold, 03) is the 1 mold, and (13α) is the spline molding inside. The shaft has a spline-like groove with a clearance, -T5J function f, c, and the short length of the moon is 1.
:+h) indicates the elongated outer periphery of the water girder, male part, ■ indicates the shaft for spline forming, 05) indicates the upper punch formed in the shape to fit with coaxial 04), and the lower punch is also formed in the same shape. be done.

Therefore, according to this method, an L gear, wheelie, and snorocket sash having 11 holes in the shape of a circle, a keyway groove, and a spline hole in the boss portion (& 11 reinforced plastics) are formed.

The above implementation! Regarding 5'1'i, ↓ circle f1 shape element is used, but depending on the shape of the molded product, by matching the shape of gold 5j+, the outer periphery can be changed to river JF? ,6
The same molding method is applied to square cross sections and other irregularly shaped cross sections.

In addition, as for the ablation 191, the short U°, the center part that is pulled from the male part may be made of simple plastic or filler-added plastic of #A and 1, depending on the target molded product. Rizen Ito o short 9 MI: ell
It is also possible to change the +ta to ′ to make the long length and male part.

Furthermore, in addition to the molds being arranged vertically as in the previous embodiment, it is also possible to arrange them horizontally or to make the molds more complex. Depending on the shape, it may be possible to form the shape with one punch, or the sixth
It is also possible to form a molded product using a structure in which the punch is pressed from the lateral direction as shown in FIGS. 1 and 2 (more complicated).

Furthermore, a plurality of shaft hole forming holes 1111 are arranged in the mold, and a yJ through hole of a number corresponding to JtK is provided in the lugs.
It is also possible to mold a molded product having multiple shaft holes.

Although the present invention has been described above with reference to embodiments, the present invention is of course not limited to such embodiments, and various modifications may be made without departing from the spirit of the present invention. It is something.

4. [Explanation of simple explanation of page 11] Figures 1 and 2 are longitudinal cross-sections of 9-paper-covered plastic molding method according to the present invention, which are about 7J' in length in Example 11. Figure 6 shows the oblique ir+li l? of a molded article molded by the method of the present invention. ＋、No. 4 1 is an enlarged partial slope view of the part, FIG.
7: Large vertical cross section, Figure 7F; Figures 1 and 8 are the slope 1 of the molded product of 1:) formed by the method of the present invention, and the molding profile of the same molded product, Figure 9 1,000 m1 of the 4 to 11 hole portion of another molded product molded by the method of the present invention
, FIG. 10 and FIG. 11 show the mold structure for molding the round part 7
, respectively No. 11\Io) k-A fragment and No. 21'', /,
This is the part corresponding to the old rn.

(2)... Cumulative month, (3)... Upper mold, (11)...
・Lower mold, (51...Dobe punch, (6)...Lower punch, (71...Shaft hole forming II'1411.(8
)...Gap sub-agent Patent attorney Okamoto Tsume Fumiyo 1 Roma 1st Zutsuki 27 Figure 3 Figure 5 Figure 4 Figure 6 Kasumikabura 70 Figure 9 Figure 8 f4f2f3b Figure 10/4/ 2 Figure 11 Procedural Amendment 111J September 16, 1996 Kazuo Wakasugi, Commissioner of the Japan Patent Office 1. Indication of the case: 1982 Patent Application No. 134412 2. Title of invention: Method for molding fiber-reinforced plastics 3. Relationship with the case of the person making the amendment Patent applicant name (620) Mitsubishi Heavy Industries, Ltd. 4, sub-agent (6208) 3 others 5, date of amendment order Showa (1 year) Date of issue (shipment date)
7. Contents of amendment A In the specification (1) [Claims 1] The old is amended as follows h
A material with a continuous cross section that has a predetermined through hole formed by molding fibers into a semi-hardened state in a plastic matrix is immediately adapted to the shape of the molded product by fitting the tube through hole of the same material to the shaft hole forming shaft. After placing it in a closed mold with a void that
The material is pressed with a punch from the la cross-sectional direction to fill the void with the material, and is molded into a molded product having a pipe hole inside. "A method for molding fiber-reinforced plastics characterized by completing the following" (2) "Next" in line 16 of page 2 is corrected to "on the other hand."

(3) On page 3, line 7, ``Next, correct J to ``on the other hand''.

(4) Correct “plastic” in line 9 of page 3 to “plastic”.

(5) On page 6, line 10, ``Then, j will be corrected to ``this one''.

(6) On page 6, line 12, "using the mold" is corrected to "listening to the mold."

(7) r(13) on page 7, line 15 is the lower mold, and delete ".

Out of 86 drawings Figure 4 has been supplemented as shown in the attached sheet.

Claims (1)

[Claims] A material with a continuous cross section that has a predetermined through hole formed by molding fibers in a semi-hardened state with a plastic matrix is created by fitting the through hole on the allotropic side to the shaft hole forming shaft to create a void that immediately corresponds to the shape of the molded product. After placing the material in a closed mold with a hole, the material is pressed from the direction of its continuous cross section with a punch to fill the void, forming a molded product having a through hole inside, and then molding the material into a mold with a through hole inside. A method for molding fiber-reinforced plastic, characterized by controlling mold temperature to complete curing of the plastic.