JPH0259328A - Manufacture of frp container - Google Patents

Abstract

PURPOSE:To enable sticking work to be performed accurately and easily by applying a coating material, and then curing, on the dividing lines appearing on the surface of a mold fabricated with divided molds and in the vicinity of them, and sticking a lining material and fibre reinforced plastics on the surface of the mold in overlaying relations, and then curing them. CONSTITUTION:A mold part 3 formed by divided molds is inserted with a shaft part 2, and the holding ring is clamped by bolt so as to obtain a mandrel 1. A coating material 1 is applied on the surface of the mold part 3 in the recessed part of dividing lines 20 and in the vicinity of them, and the surface is smoothed by curing at an ordinary temperature. After that, a silicon rubber sheet of a lining material 13 is wound around the surface of the mold part 3 of the mandrel 1. The mandrel 1 is set on a filament winder, and the reinforced fibre F such as carbon fibre or the like impregnated with plastics such as epoxy resin or the like in a resin bath is wound overlaying from the outer periphery of the lining material. The mandrel 1 is heated while it is rotating in a heating furnace 22, and when the curing of FRP is completed, it is moved out of the furnace 22, further, the mandrel 1 is disassembled and separated from the mold, and a container 10 as an article is obtained.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention relates to a method for manufacturing a container made of fiber reinforced plastic (hereinafter referred to as FRP), which has an opening smaller than the body and has a lining on the inner surface of the container. Regarding.

(Prior Art) When manufacturing a container having this type of lining, the container is made of FRP, and a separately prepared lining material is inserted and pasted through the opening of the container.

However, the work efficiency of inserting the lining material through the narrow opening of the container and pasting it to the inside surface of the container is poor, and when it is required that the lining material be firmly attached to the inside surface of the container, the lining material cannot be pasted properly. This makes the work extremely difficult, and inspection of the adhesion of the lining material is also troublesome.

When attaching the lining material after the container is formed, the mold release agent used during container molding is already attached to the inner surface of the container, so before applying the lining material, apply this mold release agent. Removal is required, making manufacturing inefficient.

According to another conventional technique, the container is divided into two halves at the body, and a lining material is pasted to each half of the FRP container through the large opening created by the division. .

However, according to this manufacturing method, although the workability of pasting the lining material is better than in the prior art described above, the number of parts and the number of work steps are increased, so that manufacturing is not efficient.

(Problems to be Solved by the Invention) The present invention has been made based on the above circumstances, and is a method for manufacturing this type of container, in which the lining material is reliably attached to the inner surface of the container, and the manufacturing process is efficient with fewer man-hours. This is what we propose.

(Means for Solving the Problems) Therefore, the present invention provides a method for manufacturing a container having an opening smaller than the diameter of the body and a lining material pasted on the inner surface of the container. When these split molds are assembled, a film agent is applied to the parting line and its vicinity that appears on the surface of the mold and cured, and a lining material is pasted to the surface of this mold, and the Good, a Mi fiber-reinforced plastic material is laminated and pasted on the outer peripheral surface of the lining material,
The fiber-reinforced plastic is cured and the split mold is released.

(Function) Therefore, the lining material is pasted on the surface of the mold, and the FRP material is wrapped around the outer circumferential surface of the lining material and pasted, so the joining work between the lining material and the FRP material can be done from the outside, reliably and Pasting can be done easily.

Since the lining material can be applied from the outside in this way, there is no need to divide the container, and as a result, there is no increase in the number of work steps, so manufacturing can be carried out efficiently.

Furthermore, since a hardened film agent is applied to the parting line of the split mold that makes up the mold and its vicinity, the mark of the parting line of the split mold is not transferred to the inner surface of the lining material, and the inner surface of the product is smooth. can be obtained.

(Example) An example shown in the figure will be described below. The container in this example is a spherical rocket motor case,
The lining material is a silicone rubber sheet for insulation.

First, the mandrel 1, which is a mold, will be explained with reference to FIGS. 2 to 5.

The mandrel 1 includes a shaft portion 2 and a mold portion 3 formed on the outer periphery of the shaft portion 2.

The mold part 3 has an oval cross section along the axial direction of the shaft part 2, and is formed so as to be disassembled into a plurality of split molds.

The mold part 3 has a hollow interior as shown in FIG. The end part mold 5 to be formed is a hollow, and the peripheral part mold 4 is the same as the first part shown in FIGS. 3 and 4. Second. Third three types of peripheral split molds 4a, 4b
, 4c, and the end split mold 5 has a container 100 opening 12.
The first one installed at 011. Second end split molds 5a, 5b
and a third one installed at the opposite end. Fourth end split mold 5
It consists of c and 5d.

And these divided types 4a, 4b, 4c,
5a, 5b, 5c, and 5d are constructed so that they can be disassembled and assembled from the shaft portion 2 side using a large number of bolts 15 and 16 as shown.

The mold part 3 formed by a plurality of split molds in this way is constructed by assembling only the mold part 3 separately from the shaft part 2 in advance, inserting the mold part 3 into the shaft part 2, and fixing the retaining ring 6 with the fixing bolt 7. By tightening with 8, a mandrel 1 having a predetermined shape can be obtained.

Thus, using this mandrel 1, an FRP container 10 is manufactured, in which the diameter d of the opening 12 is smaller than the diameter of the body 11, and the lining material 13 is attached to the inner surface of the opening 12.

The manufacturing process of this container 10 will be explained in order below with reference to FIG.

FIG. 1(a) shows a mandrel 1 assembled as described above, and on the surface of this mandrel 1 are the divided molds 4a, 4b, 4c, 5a, 5b,
1jJ when the edges of 5c, 5d, are abutted
! There are 1120.

If such a parting line 20 exists on the surface of the mold part 3, there is a risk that the mark of this parting line 20 will be transferred to the product formed using this as a reference, resulting in cracks. The mold section 3 of the mandrel 1 is subjected to the following treatment.

That is, in this embodiment, a curable coating agent 21 (
For example, Polyset 2188PT (trade name, APT) is applied to the recesses defined by the parting line 20 and cured at room temperature for 30 minutes or more to smooth the surface.

After this film agent 21 has hardened, a silicone rubber sheet serving as a lining material 13 that will become an insulator in the rocket motor is wound around the surface of the mold part 3 of this mandrel 1 (c
).

Note that it is also possible to form the lining material by applying it to the mold part 3 and curing it as a paste-like material instead of using a sheet material.

The mandrel 1 with the lining material provided on the surface of the mold part 3 in this manner is set in a known filament winder, and from the outer periphery of the lining material, reinforced carbon fiber or the like impregnated with plastic such as epoxy resin in a resin bath is used. The fibers F are overlapped and wound (d). As a result, the fiber-reinforced plastic material forming the container body is molded by the filament winding method.

In this case, the reinforcing fibers may be known reinforcing fibers such as glass fibers in addition to carbon fibers, and the orientation direction of the reinforcing fibers by the filament winder may be helical or polar, taking into consideration the desired strength of the container. An appropriate winding pattern such as winding may be adopted.

In this embodiment, the filament winding method is used to form the container 10 as described above, but when this method is carried out using the split mandrel 1, the tension of the reinforcing fibers is used to The lining material 13 will dig into the wire 20 portion, but since the hardened coating agent 21 is present as described above, this digging can be prevented and a product with a smooth inner surface of the lining material 13 can be obtained. Obtainable.

Moreover, as mentioned above, although the work involves winding the reinforcing fibers in a flexible state from the outside of the lining material 13,
It is possible to visually check the state of adhesion of FRP to the surface, and it is possible to reliably confirm the adhesion of both.

Note that if the self-adhesive force between the lining material and the plastic component of the FRP formed on its outer periphery is large, there is no need to apply a special adhesive in advance, but if the self-adhesive force is small, it may be necessary to apply an appropriate adhesive. It is sufficient to coat the surface of the lining material with a suitable adhesive in advance and then wrap the reinforcing fiber around it.

In this way, the reinforcing fibers are wound around the surface of the lining material, and the canandrel 1 is rotated as it is in the heating furnace 22 and then heated at 130'C for 3 hours or more to harden the FRP (e ).

The reason for rotating in the heating furnace 22 in this way is to uniformly heat the entire container 10 and suppress the occurrence of hardening strain.

When the hardening of the FRP is completed, the furnace is taken out, the mandrel 1 is disassembled and released, and a container 10 for holding the product is obtained (f
).

Note that after the container 10 is hardened, the outer shape may be finished into a predetermined shape by machining, if necessary.

Next, the demolding operation of the mandrel 1 will be explained with reference to FIGS. 2 to 5.

That is, first, remove the fixing bolt 7.8 located in the opening, and then remove the presser ring 6.

Next, the shaft portion 2 is pulled out from the opening 12 of the container 10,
A tool is inserted into the mold part 3 from the space in which the shaft part 2 was mounted, and the end split molds 5a to 5d on the opening 12 side are taken out head by head.

This is because by removing the end portions on the side of the opening 12 from the split molds 5a to 5d, the space opened by the opening 12 is expanded, making it easier to work in the internal space of the mold section 3.

Next, the other end split molds 5a to 5d are removed and taken out.

This is because the end split molds 5a to 5d are smaller than the circumferential split molds 4a to 4C, making it easier to release the relatively large peripheral split molds 4a to 4C.

After that, the first circumferential split mold 4a is taken out, and then the second
．． The mold release of the container 10 is completed by taking out the third circumferential split molds 4b and 4c.

In this way, since the split mold is disassembled as the container 10 is released from the mold, the film agent 21 formed on the parting line 20 is destroyed, but the film agent is simply applied. So it's not that troublesome work.

Additionally, unlike conventional mold release agents that treat the entire part of each divided mold, it only needs to be applied locally, so it has the advantage of requiring less consumption.

Note that the containers in the examples described above were formed by the filament winding method;
It goes without saying that the present application is not limited to this, and a method such as a hand lay-up method may be used.

(Effects of the Invention) As explained above, the present invention provides a method for manufacturing a container having an opening smaller than the diameter of the body and a lining material attached to the inner surface of the container. When these split molds are assembled, a film agent is applied to the parting line and its vicinity that appears on the surface of the mold, and cured.A lining material is pasted on the surface of this mold, and then ,
A fiber-reinforced plastic material is laminated and pasted on the outer peripheral surface of the lining material, the fiber-reinforced plastic is cured, and the split mold is released.

Therefore, the lining material is pasted on the surface of the mold, and the FRP material is layered and pasted on the outer peripheral surface of this lining material, so the joining work between the lining material and the FRP material can be done from the outside, and the pasting can be done reliably and easily. can do the work.

Since the lining material can be attached in this way, the container does not need to be divided, and the number of steps for assembling the container does not increase, so that manufacturing can be carried out efficiently.

Furthermore, since a hardened film agent is applied to the parting lines of the split molds that make up the mold and the vicinity thereof, the traces of the parting lines of the split molds are not transferred to the inner surface of the lining material, and the inner surface remains plain and clean. You can get the product.

[Brief explanation of the drawing]

The drawings relate to one embodiment of the rocket motor case of the present invention, and FIGS. 1(a) to (f) are explanatory diagrams of the manufacturing method, FIG. 2 is an axial cross-sectional view of the mandrel, and FIG. 3 is an illustration of the manufacturing method. Figure 2 is a cross-sectional view taken from ■-■ in Figure 2.
The IV sectional view and FIG. 5 are sectional views of the joint portion between the circumferential split mold and the end split mold. F; Reinforcing fiber, 1; Mandrel, 2; Shaft, 3;
Mold part, 4; Peripheral split mold, 5; End split mold, 11; Body part, 12; Opening part, 10; Container, 13; Lining material,
20; Parting line, 21; Coating agent. jealousy 3 a

Claims (1)

[Scope of Claim] A method for manufacturing a container having an opening smaller than the diameter of the body and having a lining material pasted on the inner surface of the container body, comprising: a mold consisting of split molds, the split molds comprising: A film agent is applied to at least the parting line and the vicinity of the parting line that appears on the surface of the mold when assembled and cured, a lining material is attached to the surface of this mold, and then a coating is applied around the lining material. F, characterized in that a fiber-reinforced plastic material is wound around the fiber-reinforced plastic, the fiber-reinforced plastic is cured, and then the split mold is taken out from the opening and released.
Method for manufacturing RP containers.