JP2001150576A - Insert and bonding structure for the insert - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a honeycomb sandwich structure wherein the thickness of a bonding layer is uniform, and the unevenness in the bonding strength is less. SOLUTION: A protruding section is formed on the bonding surface side of a flange which constitutes this T-shaped insert. The insert forms a uniform bonding layer between the flange and the bonding surface of the skin of the honeycomb sandwich structure by inserting the insert in the insert insertion hole of the honeycomb sandwich structure until the protruding section comes into contact with the skin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for bonding parts to an insert and a honeycomb sandwich structure.

[0002]

2. Description of the Related Art FIG. 3 is a view showing a structure of a conventional insert bonding portion to a honeycomb sandwich structure. First, FIG. 3 will be described. In this figure, 1 is a T-shaped insert, 2 is a skin, 3 is a core material, and 4 is an adhesive.

Here, the above will be described in more detail with reference to FIG. FIG. 4 is an enlarged view of the insert bonding portion, in which 1 indicates an insert, 2 indicates a skin, and 4 indicates an adhesive. The insert 1 is mainly formed by machining aluminum alloy, titanium alloy, or the like by machining. Generally, the center shaft flange side is internally threaded or bored. It is used for connection of devices and fastening of devices. The insert 1 is provided with an epoxy paste adhesive 4 on a honeycomb sandwich structure (skin 2, core material 3) in which an insertion hole has been processed in advance, on a bonding surface of a flange of the insert 1, a bonding surface of a honeycomb sandwich structure, or both. After coating, inserting into the insert insertion hole and setting, the flange portion of the insert 1 is weighed on the honeycomb sandwich structure side or left under pressure with an adhesive tape or a pressing jig to leave the adhesive 4
Is mounted by curing.

[0004]

Conventionally, when the surface of the skin 2 of the sandwich structure to which the insert 1 is bonded is partially convex, or when the insert 1 is unstable due to the viscosity of the adhesive 4, When the pressure-curing is performed, the thickness of the adhesive layer varies as it is, and it is extremely difficult to control the thickness of the adhesive layer to be constant. In general, when an adhesive is used, the thickness of the adhesive layer has a close effect on the adhesive strength, and if it is too thin or too thick, its properties cannot be fully exhibited. Is known to exist. Therefore, in the conventional method, the adhesive strength of each insert also partially varies, and in the worst case, there is a problem that the structure comes off the insert portion during use.

[0005] As shown in FIG. 5, a gap 5 having a constant thickness, such as a metal wire, is inserted into a sandwich structure and an insert 1.
It is also conceivable to use a method of bonding between flanges. Since both are pressed until they adhere to the gap 5, they are pressed in a stable state without being affected by the viscosity of the adhesive 4. In addition, bonding can be performed without being affected by partial convexity of the skin surface. However, in this case, there has been a problem that the bonding process becomes extremely complicated and the productivity is reduced.

A method of mixing glass spheres 6 corresponding to the thickness of the adhesive layer into the adhesive 4 as shown in FIG. 6 instead of a fixed gap of a metal wire or the like is also conceivable. If the added amount is too large, there is a problem that the adhesive strength is lowered or the adhesive itself becomes expensive.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and the bonding strength is maintained with a constant thickness of the bonding layer by bonding using an insert having protrusions arranged in advance on the bonding surface side of the flange portion. An object is to obtain a structure with less variation.

[0008]

According to a first aspect of the present invention, there is provided a T-shaped insert which is bonded to a skin of a honeycomb sandwich structure, wherein a protrusion is formed on a bonding surface side of a flange constituting the insert. It was done.

Further, the insert according to the second aspect of the present invention is mounted on the skin such that the projection forms a fixed adhesive layer between the flange and the adhesive surface of the skin of the honeycomb sandwich structure. Things.

A third aspect of the present invention provides an insert bonding structure for bonding an insert to a honeycomb sandwich structure having a skin and a core material and having a hole into which a T-shaped insert is inserted. In the structure, a T-shaped insert having, on the bonding surface side of the flange, a protrusion for forming a fixed adhesive layer between the flange and the bonding surface of the skin of the honeycomb sandwich structure is provided. The honeycomb sandwich structure is inserted into the hole of the honeycomb sandwich structure until it comes into contact with the upper surface, and an adhesive is provided between the flange of the insert and the skin.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 1 and 2 show a first embodiment of the present invention. FIG. 1 is a view showing the structure of the bonding portion, and FIG. 2 is a view showing the entire insert. In these figures, 1 is the insert, 1
a is a projection, 1b is a flange, 2 is a skin, 3 is a core material,
Reference numeral 4 denotes an adhesive. Here, as the insert 1 to be bonded to the skin 2, a protrusion 1a having a constant thickness is arranged on the bonding surface side of the flange 1b. The projection 1a is provided in advance at the time of manufacturing the insert. The protrusion 1 a is pressed until it comes into contact with the skin 2. In this case, since the thickness of the adhesive 4 is determined according to the height of the projection 1a, the thickness of the insert 1 may be affected by the partial convexity of the skin surface or the insert 1 may be unstable due to the viscosity of the adhesive 4. Since there is no pressure hardening, an adhesive layer having a constant thickness can always be obtained, and as a result, there is an effect that the variation in strength is remarkably improved. In addition, since it does not affect the operation procedure at all, the productivity of the bonding operation can be kept good. In addition, since the projection 1a is formed simultaneously with the insert 1 in the lathe processing step when the insert 1 is manufactured, it does not affect the operation procedure at all, and the manufacturing cost is almost equal to the case of manufacturing the insert without the projection.

[0012]

According to the first to third aspects of the present invention, an adhesive layer having a constant thickness can be obtained, and as a result, there is an effect that the variation in strength is remarkably improved. In addition, since it does not affect the work procedure at all, it is possible to maintain good productivity.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment according to the present invention.

FIG. 2 is a diagram showing a first embodiment according to the present invention.

FIG. 3 is a diagram showing a conventional method.

FIG. 4 is a diagram showing a conventional method.

FIG. 5 is a diagram showing a conventional method.

FIG. 6 is a diagram showing a conventional method.

[Explanation of symbols]

1 Insert, 2 skins, 3 cores, 4 adhesives, 5 gaps, 6 glass spheres.

Claims (3)

[Claims] 1. A T-shaped insert bonded to a skin of a honeycomb sandwich structure, wherein a protrusion is formed on a bonding surface side of a flange forming the insert. 2. The method according to claim 1, wherein the protrusion contacts the skin so as to form an adhesive layer between the flange and the adhesive surface of the skin of the honeycomb sandwich structure. insert. 3. An adhesive bonding structure of an insert having a skin and a core material, wherein the insert is bonded to a honeycomb sandwich structure having a hole into which a T-shaped insert is inserted. A T-shaped insert having a projection that forms a constant adhesive layer between the flange and the skin adhesive surface of the honeycomb sandwich structure until the projection comes into contact with the skin. 3. An adhesive bonding structure for an insert, wherein the adhesive is inserted into the hole and an adhesive is provided between the flange of the insert and the skin.