JPH08309870A - Repairing method for sandwich panel and sandwich panel - Google Patents

Abstract

PURPOSE: To provide a stable repairing method of high strength reliability which repairs the unmatched deformation of the surface board of a sandwich panel or the unbonded part between the surface board and a core material. CONSTITUTION: A repairing hole is formed in the surface board 2 of a repairing place of a sandwich panel 1, a repairing pin 4 and a sleeve 5 with a seat are inserted into the hole, and the end 4b of the pin 4 is caulked by plastic processing to fix it to the sandwich panel 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a sandwich panel, and more particularly to a method for easily repairing concave or convex deformation of a face plate or non-bonding of a face plate and a core material that has occurred in a sandwich panel.

[0002]

2. Description of the Related Art A sun-etch panel is composed of a pair of face plates and a core member disposed between the face plates, and their contact portions are joined together with an adhesive or a brazing material. When a brazing material is used, a light alloy material is used for the face plate and the like. When the brazing sandwich panel is used as a structural parting material, a thick edge material (reinforcing material) is provided along the sides of the pair of face plates, and the edge material and the face plate are joined together. In addition, a thick reinforcing material is arranged inside and brazed to the face plate.

Japanese Patent Application No. 04-222 discloses a method for repairing a brazed sandwich panel in the case of a defective joint between the core material and the face plate, or when the face plate has a recess or a hole.
514 is shown. In this method, a hole is made in a pair of face plates of a portion requiring repair, a repair member is inserted into the hole, and the face plate is welded to each face plate.

[0004]

In the above prior art, since welding is used, repair work time or cost may be increased. Further, there is a possibility that the material strength of the repaired part may be lowered due to heating by welding. Further, in the case of welding, the strength reliability of the repaired portion is likely to vary depending on the welding skill of the operator.

It is an object of the present invention to facilitate repair work and reduce repair costs.

[0006]

The above object is achieved by inserting a repair pin and a seated sleeve into a repair hole arranged in a face plate of a repair site, and plastically fixing the sandwich panel and the repair pin. It

[0007]

When the face plate of the sandwich panel structure is convexly deformed or concavely deformed or the face plate and the core material are not joined, the repair pin is fixed between the pair of face plates by plastic working. Make repair holes on the face plate. The size of the repair hole is different on the front and back plates, the sleeve with a seat is inserted from the larger one, the repair pin is inserted from the smaller one, and the tip of the repair pin is put out from the face plate on the opposite side through the seat sleeve. The repair pin is fixed to the sandwich panel by crimping or breaking the tip by plastic working.
At this time, the repair reliability is further improved by sandwiching the repair part face plate between the head of the repair pin and the tip of the seated sleeve.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, the sandwich panel 1 has a core material 3 and a reinforcing material (not shown) disposed between a pair of face plates 2 if desired. The face plates 2 and 2 are joined to the core material 3 or a reinforcing material (not shown) by an adhesive or brazing. The material of the face plate 2, the core material 3, and the reinforcing material is a light alloy material.

In the sandwich panel 1, if the face plate 2 is convexly or concavely deformed for some reason, it is necessary to repair the face plate 2 at that portion flat. Further, when the face plate 2 and the core material 3 or the reinforcing material is poorly bonded, it is necessary to bond them.

FIG. 1 is a vertical cross-sectional view of a portion where such a repair-needed portion is repaired. The two face plates 2 and 2 are connected by a repair pin 4 and a sleeve 5 with a seat. Reference numeral 4a is a head of the repair pin, and 4b is a portion crimped after the repair pin 4 is inserted into the sleeve 5 and then connected. The head 4a of the repair pin 4, the tip 5b of the sleeve 5, and the circumference 2c of the bottom of the partial face plate 2 are dish-shaped. The face plate on the head 4a side of the repair pin 4 is a face plate that is the front side in the use state, or is a face side that requires a flat surface in the use state. In FIG. 1, the lower face plate 2 side is the face side that does not require such a thing, and the seat 5 of the sleeve 5
The caulked portion of a and the repair pin 4 is projected. The repair pin 4 and the sleeve 5 are light alloy materials. The face plate 2 has a thickness of about 1 mm and is easily bent. Seat 5b of sleeve 5
The diameter of is to be as large as possible so that the face plate 2 around the tip of the repair pin is not depressed when the tip 4b of the repair pin is caulked.

This manufacturing method will be described with reference to FIG. Holes 2a and 2b are formed in the pair of face plates 2 and 2 in the portion requiring repair. A small-diameter hole 2a is formed in the face plate 2 which is the front side in the used state. A large-diameter hole 2b is formed in the face plate 2 on the other side. The hole is made from the large diameter hole 2b side. Next, the sleeve 5 with a seat is inserted through the hole 2b. The tip 5b of the sleeve is dish-shaped. Apply this to the mold and punch 7 from the hole 2a side.
Press the face plate 2 by. As a result, the face plate 2 around the name 2a becomes dish-shaped. Next, the repair pin is inserted from the hole 2a side, the head 4a thereof is housed in the dish 2c of the hole 2a, and the portion of the sleeve 5 protruding from the seat 5b is caulked. Repair pin 4
Since the periphery of the repair pin 4 is constrained by the sleeve 5, the repair pin 4 does not buckle when the tip 4b of the repair pin 4 is caulked.

According to this structure, the tip 5 of the sleeve 5 is
Since the face plate 2 is sandwiched between b and the head 4a of the repair pin 4, it is possible to prevent the face plate on the head 4a side from being depressed when the repair pin 4 is caulked.

When the need for repair is caused by the opening of a small diameter hole, the hole is closed by the repair pin 4 so that the hole can be flattened. The same applies to small-diameter depressions. When the face plate is bulged, the repair pins 4 and the sleeve 5 pull the face plates 2 and 2 toward the core material 3, so that the bulge can be flattened. Further, even when there is a contact failure between the face plate 2 and the core member 3, the repair pins 4 and the sleeve 5 similarly press the face plates 2 and 2 against the core member 3, so that the strength can be improved.

As described above, since it is possible to repair holes and the like without using welding, it is possible to repair at low cost.

Another embodiment of FIG. 3 will be described. The sleeve 5d of this embodiment is designed so that the sleeve 5d is inserted from the hole 5b of the system.
After inserting d, the convex portion 5e is provided by the rubber expansion tube, and the face plate 2 is sandwiched by the convex portion 5e and the seat 5a. Others are the same as those of the embodiment shown in FIGS. 1 and 2. According to this, the face plates 2 and 2 can be sandwiched by the repair focus sleeve 5 without interposing the core material 3.

Another embodiment of FIG. 4 will be described. In this embodiment, the presence of protrusions is allowed in both of the pair of face plates of the sandwich panel, and it is not necessary to provide the recess 2c in the face plate as shown in FIG. 1 or FIG. That is, the face plate 2 is provided with the repair holes 2a and 2b, the seated sleeve 5 is inserted from the repair hole 2b, and the head 4d is inserted from the repair hole 2a.
Insert the repair pin 4 having the above into the cylinder of the seated sleeve 5. Then, the tip 4b of the repair pin 4 is caulked by plastic working to fix the repair pin 4 to the sandwich panel 1 to repair the sandwich panel.

Another embodiment of FIG. 5 will be described. The present embodiment is a repair method in the case where no protrusion is allowed on one face plate of the sandwich panel as shown in FIG. 1 or 3. As in FIG. 1 or 3, the head 4a of the repair pin is housed in the recess 2c formed in the face plate 2, the sleeve 5f with a seat is inserted through the hole 2b provided in the face plate 2 on the opposite side, and the repair pin 4 is inserted into the sleeve 5d with the seat. The tip 4c of the repair pin 4 is cracked and opened to fix the repair pin 4 to the sandwich panel 1. This embodiment is effective for repairing the convex deformation of the sandwich panel 1.

FIG. 6 is an example showing the repair procedure of the embodiment shown in FIG. The face plate 2 of the sandwich panel 1 is provided with repair holes 2a and 2b, and a die 8 having a dish-shaped recess 8a at its tip is inserted through the repair hole 2b provided in the face plate 2. In this state, the die 8 is supported by the die 6, and the face plate 2 on the opposite side is pushed in by the punch 7 to form the recess 2c in the face plate 2.
After this, the die 8 is removed, the seated sleeve 5f is arranged, and the repair pin 4 is fixed to the sandwich panel 1 as shown in FIG.

An adhesive may be used in combination with the face plate, the repair pin and the seated sleeve.

[0020]

EFFECTS OF THE INVENTION According to the present invention, the sandwich panel structure can be repaired without using welding for convex deformation or concave deformation, or for repairing the unbonded portion between the face plate and the core material, which facilitates repair work. Cost can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a repair portion of a sandwich panel according to an embodiment of the present invention.

FIG. 2 is a sectional view illustrating an example of a repair work procedure of the embodiment in FIG.

FIG. 3 is a sectional view of a repair portion of a sandwich panel according to another embodiment of the present invention.

FIG. 4 is a sectional view of a repair portion of a sandwich panel according to another embodiment of the present invention.

FIG. 5 is a sectional view of a repair portion of a sandwich panel according to another embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating an example of the repair work procedure of the embodiment in FIG.

[Explanation of symbols]

1 ... Sandwich panel, 2 ... Face plate, 3 ... Core material, 4 ... Repair pin, 5 ... Seat sleeve, 6 ... Mold, 7 ... Punch,
8 ... die.

Claims (6)

[Claims] 1. A method of repairing a sandwich panel in which a pair of face plates and a core material disposed between the face plates are brazed or bonded with an adhesive, and a repair hole is provided in the pair of face plates at the repair site, and one of the face plates is repaired. A method for repairing a sandwich panel, which comprises inserting a sleeve and a repair pin from a repair hole of a face plate, and caulking the repair pin to fix the sandwich panel. 2. A repair method for a sandwich panel in which a pair of face plates and a core material disposed between the face plates are brazed or bonded with an adhesive, wherein a repair hole is provided in the pair of face plates at the repair site, Insert the sleeve part of the seat sleeve through the repair hole of the face plate, position the seat outside the sandwich panel, and then insert the pin part of the headed repair pin into the seat sleeve sleeve through the hole of the other face plate. Then, the tip of the repair pin is caulked, and the sandwich panel repair method is characterized in that: 3. The sandwich panel repair according to claim 1, wherein a dish-shaped recess is provided around the hole of the one face plate, and the dish-shaped head of the repair pin is inserted into the recess. Method. 4. The sandwich panel repairing method according to claim 3, wherein the face plate is dished by pushing the one face plate against the dish portion at the tip of the cylindrical portion of the seated sleeve. 5. The tip of the repair pin according to claim 4, wherein the tip of the repair pin is caulked while the one face plate is sandwiched between the tip of the tubular portion of the seated sleeve and the head of the repair pin. Sandwich panel repair method. 6. A sandwich panel in which a pair of face plates and a core material disposed between the face plates are brazed or bonded with an adhesive, and a hole is formed around one of the face plates. A sandwich panel, characterized in that a repair pin having a dish-shaped head is inserted into the portion to penetrate the sandwich panel, and the penetrated repair pin is caulked on the other face plate side.