JP2814797B2 - How to attach insulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for attaching an insulator to an inner peripheral surface of a cylindrical work typified by, for example, a chamber (motor case) of a rocket motor.

[0002]

2. Description of the Related Art As is well known, an insulator such as heat-resistant rubber is adhered to the inner peripheral surface of a chamber of a rocket motor by means such as adhesion or vulcanization adhesion. As shown in FIG. 7, the pressure is applied from the inside of the insulator 3 using the airbag 11 having a high flexibility.

FIG. 3A shows a chamber 1 having both ends open.
The airbag 11 is inserted into the insulator 3, air is introduced into the airbag 11 to inflate the airbag 11, and a pressing force is applied to the insulator 3 by using the cylindrical surface 11 a of the airbag 11. The insulator 3 is attached to the inner peripheral surface of the chamber 1.

FIG. 1B shows an example of a so-called closure type chamber 2 having one end with a bottom. If the chamber 2 itself has a bottom, only the cylindrical surface 11a of the airbag 11 is provided. By applying a pressing force using the spherical portion 11b at the tip, the insulator 4
On the inner peripheral surface of the chamber 2.

[0005]

In the conventional sticking method as described above, since the airbag 11 has a uniform thickness, the airbag 11 shown in FIG.
In either case (B), the entire surfaces of the insulators 3 and 4 are simultaneously pressed by the inflation of the airbag 11. As a result, air remaining between the chamber 1 or 2 and the insulator 3 or 4 cannot be released, and the chamber 1 is directly converted into bubbles (voids).
Alternatively, since it remains between the layers of the insulator 2 and the insulator 3 or 4, it is not preferable because the heat insulation performance is significantly reduced particularly in the case of a rocket motor chamber.

The present invention has been made in view of the above problems, and has as its object to provide a method capable of smoothly expelling bubbles between interlayers between a chamber (work) and an insulator. .

[0007]

According to the present invention, there is provided a method of attaching an insulator to an inner peripheral surface of a cylindrical workpiece by applying pressure to the insulator from the inside with an airbag. As a type, the thickness of which is changed smoothly from thin to thick along the longitudinal direction, and in order from the thin portion to the thick portion of the airbag with the introduction of the fluid into the airbag. It is characterized in that it is inflated and adhered while changing the timing of pressing the airbag on the insulator in the longitudinal direction of the insulator.

[0008]

According to the method of the present invention, since the airbag is of a type whose thickness is smoothly changed from thin to thick in the longitudinal direction, the airbag is inflated when the airbag is inflated. Since the pressing force is generated in order from the thin portion of the airbag, the pressing force is generated with a predetermined time difference from the thin portion to the thick portion of the airbag without pressing the entire insulator at once. Accordingly, the effect of expelling air (bubbles) between the layers of the workpiece and the insulator is exerted, and the air does not remain as bubbles in the above-mentioned interlayer portions.

[0009]

FIG. 1 is a view showing an embodiment of the present invention, and shows an example in which an insulator 3 is attached to a chamber 1 having both ends open as in FIG. 3A.

In this embodiment, as shown in FIG. 1A, the thickness of the airbag 5 corresponding to the central portion in the longitudinal direction of the chamber 1 is the smallest. A type in which the thickness increases smoothly toward both ends of the chamber 1 is used, and the airbag 5 has a uniform thickness except for the minimum thickness portion 6 and the thickness change portion 7 where the thickness increases in a tapered shape. It is thick.

When the operation of attaching the insulator 3 is performed by using the airbag 5 in the same manner as in the related art, first, as shown in FIG. 5 expands in the vicinity of the minimum thickness portion 6 and gradually expands from the minimum thickness portion 6 to the thickness change portion 7 as shown in FIG. Without being pressed at once to the surface,
From the longitudinal center of the chamber 1 to both ends 1a, 1
Then, they are sequentially pressed and adhered with a predetermined time difference toward b.

Therefore, with the progress of the attachment of the insulator 3 as described above, the air between the layers of the chamber 1 and the insulator 3 is expelled toward both ends of the chamber 1 as shown by the arrow a, and the air is formed between the above-mentioned layers. Will not be contained.

FIG. 2 is a view showing another embodiment of the present invention. As the airbag 15, a type in which the thickness changes smoothly from the bottom 15a side to the other end is used.

In this embodiment, as is apparent from FIG. 2A, the bottom 15a side of the airbag 15 is the minimum thickness portion and the thickness is the smallest, so that the insulator 3 is attached when the airbag 15 is inflated. Attachment proceeds sequentially from one end 1a of the chamber 1 to the other end 1b. Although the behavior of the insulator 3 at the stage of adhering is different from that of the first embodiment, the attachment between the chamber 1 and the insulator 3 is performed. Is expelled smoothly as in the first embodiment.

When an insulator is attached to the chamber 2 having a closure type at one end as shown in FIG. 3B, the same operation is performed by using the airbag 15 shown in FIG. Can be.

[0016]

As described above, according to the present invention, the insulator is attached by using an airbag whose thickness is smoothly changed from thin to thick along the longitudinal direction. With the introduction of the fluid into the airbag, the airbag inflates in order from the thin portion to the thick portion, and the attachment of the insulator proceeds in accordance with the degree of inflation. Is not pressed all at once.

As a result, the air between the workpiece and the insulator is expelled smoothly, the air bubbles are not left as in the prior art, and the bonding quality of the insulator is improved. In particular, the bonding of the insulator to the rocket motor chamber is performed. When applied to work, the above-mentioned residual air bubbles are eliminated, so that a decrease in heat insulation performance can be prevented.

[Brief description of the drawings]

FIG. 1 is a process explanatory view at the time of attaching an insulator according to an embodiment of the present invention.

FIG. 2 is a process explanatory view at the time of attaching an insulator according to another embodiment of the present invention.

FIG. 3 is a view showing a conventional insulator attaching method.
(A) is an explanatory view when applied to a chamber having both ends open, and (B) is an explanatory view when applied to a chamber having one end with a bottom.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Chamber as a workpiece 3 ... Insulator 5, 15 ... Airbag 6 ... Minimum thickness part

Claims (1)

(57) [Claims] 1. A method of attaching an insulator to an inner peripheral surface of a cylindrical workpiece by pressing the insulator from the inside with an airbag, wherein the thickness of the insulator is increased in a longitudinal direction as the airbag. Using a type that is smoothly changed from thin to thick along the airbag, and inflated in order from the thin portion to the thick portion of the airbag with the introduction of fluid into the airbag, and the airbag is insulated. A method for attaching an insulator, wherein the application is performed while changing the pressing timing exerted on the insulator in the longitudinal direction of the insulator.