KR101153303B1 - Insert, sandwich panel having the same and method for manufacturing the sandwich panel - Google Patents

Abstract

The sandwich panel according to the present invention includes a core material having an insertion hole penetrated in the thickness direction, a first face material covering one surface of the core material, a second face material covering the other surface of the core material and having a coupling hole communicating with the insertion hole, and inserted into the insertion hole. Contains inserts The insert includes a first flange that contacts the inner surface of the first face member to support the first face member, a second flange that contacts the inner face of the second face member to support the second face member, a web connecting the first flange and the second flange, and the first flange. It has a head tip provided on the upper surface of the second flange, the fastening hole extending into the web through the head tip and the second flange to be coupled to the coupling hole of the two face member. In the sandwich panel according to the present invention, since the insert is inserted into the core material and the core material and the insert are joined to the first face material and the second face material at the same time before the first face material and the second face material are joined to the core material, the manufacturing process is reduced and the production time is reduced. Can shorten.

Description

Insert and sandwich panel and sandwich panel manufacturing method having the same {INSERT, SANDWICH PANEL HAVING THE SAME AND METHOD FOR MANUFACTURING THE SANDWICH PANEL}

The present invention relates to a sandwich panel, and more particularly, to an insert coupled to a sandwich panel for improving the structure of the sandwich panel, and a method for manufacturing a sandwich panel and a sandwich panel having the same.

Since sandwich panels have higher specific rigidity and specific strength than conventional flat panel panels, sandwich panels are widely used in applications requiring weight reduction in aerospace and ships.

In general, the force exerted on the structural panels occurs locally at the edges or surfaces of the panels, which are fragile parts of the panels. In particular, when a sandwich panel is applied, local failure, peeling, and buckling of the face and core that make up the sandwich panel, unlike the aluminum panel or steel panel, are applied. Etc. may occur.

In order to prevent such phenomenon of the sandwich panel, a method of inserting an insert into the sandwich panel is generally used. Types of inserts generally include through-thickness inserts and partial inserts. They are inserted in the thickness direction of the sandwich panel, and the adhesive filler is filled around the insert and joined with the sandwich panel.

1 and 2 show a conventional sandwich panel 10, 16 in which a through insert 11 and a partial insert 17 are inserted. As shown, the conventional sandwich panel 10, 16 is formed by inserting the through insert 11 or the partial insert 17 provided with the bolt holes 12 and 18 into the core 13 and the face 14. After that, the adhesive filler 15 is filled around the inserts 11 and 17 and joined.

However, the conventional sandwich panels 10 and 16 have an increased overall weight due to the weight of the adhesive filler 15 applied for bonding the through insert 11 or the partial insert 17, and the adhesive filler 15 Since it requires a curing process, there is a disadvantage that the manufacturing process is complicated and the production time is long.

In addition, when the partial insert 17 is combined, since the jig for flatness and height alignment of the partial insert 17 is to be used when the adhesive filler 15 is cured, quality control is difficult.

The present invention is to solve such a conventional problem, the insert and the sandwich panel and sandwich panel having the same that can be integrally cured by inserting the core material during the manufacturing process of the sandwich panel without using a separate adhesive filler or jig It is an object to provide a manufacturing method.

Sandwich panel insert according to an embodiment of the present invention for achieving the above object is inserted into the sandwich panel, the first and second face material is coupled to one side and the other surface of the core material, the inner surface of the first face material A first flange in contact with the first face member to support the second face member, a second flange in contact with the inner face of the second face member, a web connecting the first flange and the second flange, and a web of the second flange. And a fastening hole extending through the head tip, the head tip, and the second flange provided in the second flange so as to protrude from the upper surface.

An insert for a sandwich panel according to an embodiment of the present invention includes a filler disposed between the first flange and the second flange to surround the web, and the web circumference so that the filler can be filled around the web. It may further include a wrapping reinforcement sheet.

The filler may include a material selected from a foamable adhesive and a foam.

The reinforcing sheet may include a material selected from carbon composite prepreg and glass fiber prepreg.

Insert for sandwich panel according to an embodiment of the present invention may further include a reinforcing cylinder surrounding the reinforcing sheet to reinforce the reinforcing sheet.

The reinforcing cylinder may include a material selected from carbon composite prepreg and glass fiber prepreg.

The first flange, the second flange, the web, and the head tip may be integrally formed of a material selected from metal, metal composite, and polymer composite.

Sandwich panel according to an embodiment of the present invention for achieving the above object, the core material having an insertion hole penetrated in the thickness direction, the first face material covering one surface of the core material, the other surface of the core material and communicating with the insertion hole And a second face member having a coupling hole to be inserted into the insertion hole. The insert may include a first flange that contacts the inner surface of the first face member and supports the first face member, a second flange that contacts the inner face of the second face member, and supports the second face member, the first flange, and the second face. A web connecting the flange, a head tip provided on an upper surface of the second flange to be coupled to the coupling hole of the second face member, and a fastening hole extending through the head tip and the second flange into the web; .

The core material may include a material selected from polymer foam, honeycomb, and balsa wood.

The first face member and the second face member may include a material selected from a metal, a polymer composite, and a metal composite.

The first face member, the second face member and the insert may all be made of the same material.

Method for manufacturing a sandwich panel according to an embodiment of the present invention, (a) providing an insertion hole penetrating in the thickness direction in the core material, (b) preparing an insert for insertion into the insertion hole, (c A) inserting the insert into the insertion hole; (d) bonding the first and second face members to one and the other surface of the core member into which the insert is inserted using an adhesive; and (e) the core member to the core member. A bagging step of wrapping the intermediate material bonded to the first face material and the second face material with a vacuum bag, and (f) a curing step of heating and pressing the intermediate material contained in the vacuum bag.

The step (b) includes the step of providing a fastening hole in the insert in the longitudinal direction, the manufacturing method of the sandwich panel according to an embodiment of the present invention is the fastening to the second face member before the step (d) It may further comprise the step of providing a coupling hole in communication with the hole.

In the step (b), the first flange for supporting the first face member, the second flange for supporting the second face member, the web connecting the first flange and the second flange, the second flange Preparing an insert body having a head tip provided on the upper surface and a fastening hole extending through the head tip and the second flange into the web, the first flange and the second flange to surround the web Disposing a filler in between, surrounding the filler with a reinforcing sheet; and a method of manufacturing a sandwich panel according to an embodiment of the present invention includes the head on the second face member before the step (d). The method may further include providing a coupling hole to which the tip may be coupled.

Step (b) may further comprise the step of bending the end of the reinforcing sheet protruding from the first flange or the second flange.

The step (b) may further include wrapping the reinforcement sheet with a reinforcement cylinder.

In the step (f), the reinforcing sheet may be simultaneously cured while curing the core member, the first face member and the second face member.

In the sandwich panel according to the present invention, since the insert is inserted into the core material and the core material and the insert are joined to the first face material and the second face material at the same time before the first face material and the second face material are joined to the core material, the manufacturing process is reduced and the production time is reduced. Can shorten.

In addition, the sandwich panel according to the present invention can reduce the weight because it is not necessary to use an adhesive filler for bonding the insert as in the prior art.

In addition, the sandwich panel according to the present invention can easily match the flatness and height of the insert without using a separate jig as in the prior art.

1 and 2 show a conventional sandwich panel.
Figure 3 is a side cross-sectional view showing a sandwich panel according to an embodiment of the present invention.
FIG. 4 is a perspective view of a portion of the sandwich panel shown in FIG. 3;
5 is a perspective view showing an insert of the sandwich panel shown in FIG.
6A and 6B illustrate a process of manufacturing the sandwich panel shown in FIG. 3.
7 is a side cross-sectional view showing a portion of a sandwich panel according to another embodiment of the present invention.
FIG. 8 illustrates a process of manufacturing the insert of the sandwich panel shown in FIG. 7.

Hereinafter, with reference to the accompanying drawings, it will be described in detail with respect to the insert according to the present invention and a sandwich panel and a manufacturing method of the sandwich panel.

In describing the present invention, the size or shape of the components shown in the drawings may be exaggerated or simplified for clarity and convenience of description. In addition, terms that are specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. These terms are to be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the contents throughout the present specification.

As shown in Figure 3 and 4, the sandwich panel 20 according to an embodiment of the present invention is the core member 21, the first face member 22 and the second coupled to one surface and the other surface of the core member 21 The face material 23 includes a plurality of inserts 30 inserted into the core material 21. An adhesive agent 24 is applied between one surface of the core member 21 and the first face member 22 and between the other surface of the core member 21 and the second face member 23. As the adhesive 24, a liquid adhesive liquid or a solid adhesive film may be used.

The core material 21 has a plurality of insertion holes 25 penetrated in the thickness direction, and the insert 30 is inserted into these insertion holes 25. The core 21 may include a material selected from foam, honeycomb, and balsa wood.

The first face member 22 and the second face member 23 have a thin plate shape of high rigidity and high strength. The first face plate 22 and the second face plate 23 may include a material selected from metal, polymer composite, and metal composite. The second face member 23 is provided with a plurality of engaging holes 26 corresponding to the plurality of insertion holes 25 provided in the core member 21. The size of the engagement hole 26 is smaller than the size of the insertion hole 25.

As shown in FIGS. 3 to 5, the insert 30 is in contact with an inner surface of the first face member 22 and faces an inner surface of the first flange 31 and the second face member 23 that support the first face member 22. A second flange 32 supporting the second face member 23, a web 33 connecting the first flange 31 and the second flange 32, and protruding from an upper surface of the second flange 32. And a head tip 34 provided. The first flange 31, the second flange 32, the web 33 and the head tip 34 constituting the insert 30 are made of the same material as the first face member 22 and the second face member 23, or The material may be integrally formed of a material selected from metal, metal composite, and polymer composite.

The second flange 32, the web 33, and the head tip 34 are provided with fastening holes 35 for inserting fastening members such as bolts. The fastening hole 35 extends into the web 33 through the head tip 34 and the second flange 32. By inserting the fastening member into the fastening hole 35, another sandwich panel or another structure can be coupled to the sandwich panel 20. The fastening hole 35 may be provided with a screw thread for screwing.

The first flange 31 is bonded to the first face member 22 by an adhesive agent 24 disposed between one surface of the core member 21 and the first face member 22, and the second flange 32 is attached to the core member ( It adheres to the 2nd face material 23 by the adhesive agent 24 arrange | positioned between the other surface of the 21 and the 2nd face material 23. As shown in FIG. When the second flange 32 is bonded to the second face member 23, the head tip 34 is inserted into the engaging hole 26 of the second face member 23. At this time, the end of the head tip 34 may be placed on the same plane as the outer surface of the second face member 23 without protruding from the outer surface of the second face member 23.

Hereinafter, a process of manufacturing the sandwich panel 20 according to an embodiment of the present invention will be described with reference to FIGS. 6A and 6.

First, as shown in FIG. 6A, an insertion hole 25 penetrating in the thickness direction is provided in the core material 21, and the prepared insert 30 is inserted into the insertion hole 25. Next, a second face member 23 having a first face member 22 and a coupling hole 26 is prepared, and an adhesive 24 is coated on each surface of the first face member 22 and the second face member 23. do. Here, the adhesive 24 may be coated on one surface and the other surface of the core material 21 into which the insert 30 is inserted without being coated on the first face material 22 or the second face material 23.

Next, as shown in FIG. 6B, the first face member 22 and the second face member 23 are bonded to one surface and the other surface of the core member 21 into which the insert 30 is inserted. At this time, the insert 30 is bonded to the first face member 22 and the second face member 23 together with the core member 21.

Next, the intermediate material in which the first face material 22 and the second face material 23 are bonded to the core material 21 into which the insert 30 is inserted is wrapped in a vacuum bag, and the intermediate material contained in the vacuum bag is heated. And curing by pressing. A known autoclave may be used for the curing process. Such a bagging process and a curing process are well known techniques, and thus a detailed description thereof will be omitted.

As described above, in the sandwich panel 20 according to the embodiment of the present invention, the insert 30 is attached to the core member 21 before the first face member 22 and the second face member 23 are bonded to the core member 21. Since the core member 21 and the insert 30 are inserted and joined together with the first face member 22 and the second face member 23 at the same time, the manufacturing process can be shortened and the manufacturing time can be shortened. In addition, as in the prior art, it is not necessary to use the adhesive filler for bonding the insert can be reduced in weight.

FIG. 7 illustrates a sandwich panel 40 according to another embodiment of the present invention. The sandwich panel 40 illustrated in FIG. 7 includes a core material 21 and a first surface coupled to one surface and the other surface of the core material 21. And a plurality of inserts 50 inserted into the face member 22, the second face member 23, and the core member 21. An adhesive agent 24 is applied between one surface of the core member 21 and the first face member 22 and between the other surface of the core member 21 and the second face member 23. Here, since the core material 21, the first face material 22, and the second face material 23 are the same as the sandwich panel 20 according to the embodiment of the present invention described above, the same reference numerals are given to the same, The description will be omitted.

The insert 50 includes an insert body 51, a filler 52 disposed around the insert body 51, a reinforcing sheet 53 surrounding the filler 52, and a reinforcing cylinder 54 surrounding the reinforcing sheet 53. ). The insert body 51 has a first flange 55 for supporting the first face member 22, a second flange 56 for supporting the second face member 23, a first flange 55 and a second flange. A web 57 connecting the 56 and a head tip 58 provided to protrude on the upper surface of the second flange 56. The insert body 51 is integrally formed of a material such as the first face material 22 and the second face material 23 or a material selected from metal, metal composite, and polymer composite. Can be done.

The insert body 51 is provided with a fastening hole 59 for inserting a fastening member such as a bolt. The fastening hole 59 extends through the head tip 58 and the second flange 56 into the web 57. The fastening hole 59 may be provided with a screw thread for screwing.

The filler 52 is disposed between the first flange 55 and the second flange 56 to surround the web 57 and serves to increase the strength of the insert 50 and the sandwich panel 40. The filler 52 may include a material selected from a foamable adhesive and a foam.

The reinforcing sheet 53 wraps around the filler 52, the first flange 55, and the second flange 56 so that the filler 52 maintains a filled shape around the web 57, and the insert ( 50) and to improve the strength of the sandwich panel 40. The reinforcing sheet 53 may include a material selected from carbon composite prepreg and glass fiber prepreg. The reinforcing sheet 53 may have a height greater than that of the insert body 51 so as to completely wrap the insert body 51.

The reinforcement cylinder 54 has a hollow tube shape with both ends open, and wraps around the reinforcement sheet 53 so that the reinforcement sheet 53 is not deformed or damaged when the filler 52 expands at a high temperature. To maintain and serves to increase the strength of the insert 50 and the sandwich panel 40. The reinforcement cylinder 54 may include a material selected from carbon composite prepreg or glass fiber prepreg, such as the reinforcement sheet 53. The height of the reinforcement cylinder 54 is preferably equal to the height from the lower surface of the first flange 55 to the upper surface of the second flange 56.

Hereinafter, a process of manufacturing the insert 50 of the sandwich panel 40 according to another embodiment of the present invention will be described with reference to FIG. 8.

First, the insert body 51 is prepared (FIG. 8A), and the filler 52 is filled around the web 57 of the insert body 51 (FIG. 8B). Next, the insert body 51 is wrapped with the reinforcing sheet 53 (FIG. 8C), and the reinforcing sheet 53 wrapping the insert body 51 with the reinforcing cylinder 54 is wrapped (FIG. 8 ( d), (e)). Finally, one end of the reinforcing sheet 53 protruding from the lower surface of the first flange 55 is bent to closely contact the lower surface of the first flange 55, and the reinforcing sheet protruding from the upper surface of the second flange 56. The other end of the 53 is bent and brought into close contact with the upper surface of the second flange 56 (Fig. 8 (f)).

The insert 50 manufactured as described above, like the sandwich panel 40 according to the embodiment of the present invention described above, has an insertion hole of the core member 21 before the first face member 22 and the second face member 23 are combined with each other. After inserting into (25), it bonds to the 1st face material 22 and the 2nd face material 23 with the core material 21 using the adhesive agent 24. As shown in FIG. When curing the intermediate material in which the first face member 22 and the second face member 23 are bonded to the core member 21 into which the insert 50 is inserted, the reinforcing sheet 53 and the reinforcing cylinder 54 are also cured together. The filler 52 expands to consolidate the inner space of the reinforcing sheet 53.

Embodiments of the present invention described above and illustrated in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Accordingly, these modifications and variations are intended to fall within the scope of the present invention as long as it is obvious to those skilled in the art.

20, 40: sandwich panel 21: heartwood
22, 23: 1st, 2nd face material 24: Adhesive
25: insertion hole 26: coupling hole
30, 50: insert 31, 55: first flange
32, 56: second flange 33, 57: web
34, 58: head tip 35, 59: fastening hole
51: insert body 52: filler
53: reinforcement sheet 54: reinforcement cylinder

Claims (23)

In the sandwich panel insert is inserted into the sandwich panel, the first and second face material is bonded to one side and the other side of the core material,
A first flange in contact with an inner surface of the first face member to support the first face member;
A second flange in contact with an inner surface of the second face member to support the second face member;
A web connecting the first flange and the second flange;
A head tip provided on the second flange to protrude from an upper surface of the second flange;
A fastening hole extending through the head tip and the second flange into the web;
A filler disposed between the first flange and the second flange to surround the web; And
And a reinforcing sheet wrapped around the web so that the filler can be filled around the web. delete The method of claim 1,
The filler insert for a sandwich panel, characterized in that it comprises a material selected from foam adhesive and foam (Foam). The method of claim 1,
The reinforcing sheet is an insert for a sandwich panel, characterized in that it comprises a material selected from carbon composite prepreg, glass fiber prepreg. The method of claim 1,
And insert a reinforcing cylinder surrounding the reinforcing sheet to reinforce the reinforcing sheet. The method of claim 5, wherein
The reinforcing cylinder insert for sandwich panel, characterized in that containing a material selected from carbon composite prepreg, glass fiber prepreg (Glass fiber prepreg). The method of claim 1,
The first flange, the second flange, the web and the head tip is a sandwich panel, characterized in that integrally made of a material selected from metal (Metal), metal composite (polymer composite), polymer composite (Polymer composite) Dragon insert. Core material having an insertion hole penetrated in the thickness direction;
A first face member covering one surface of the core member;
A second face member covering the other surface of the core member and having a coupling hole in communication with the insertion hole; And
A first flange inserted into the insertion hole to contact the inner surface of the first face member to support the first face member, a second flange to contact the inner surface of the second face member to support the second face member, the first flange and A web connecting the second flange, a head tip provided on an upper surface of the second flange to be coupled to a coupling hole of the second face member, a fastening extending through the head tip and the second flange and extending into the web; And an insert having a hole, a filler disposed between the first flange and the second flange to surround the web, and a reinforcement sheet surrounding the web so that the filler can be filled around the web. Sandwich panel. delete The method of claim 8,
The filler panel is a sandwich panel, characterized in that it comprises a material selected from foam adhesive and foam (Foam). The method of claim 8,
The reinforcing sheet is a sandwich panel comprising a material selected from carbon composite prepreg and glass fiber prepreg. The method of claim 8,
And wherein the insert further comprises a reinforcement cylinder surrounding the reinforcement sheet to reinforce the reinforcement sheet. The method of claim 12,
The reinforcing cylinder is a sandwich panel, characterized in that it comprises a material selected from carbon composite prepreg, glass fiber prepreg. The method of claim 8,
The first flange, the second flange, the web and the head tip is a sandwich panel, characterized in that integrally made of a material selected from metal (Metal), metal composite (polymer composite), polymer composite (Polymer composite) . The method of claim 8,
The core material is a sandwich panel, characterized in that it comprises a material selected from polymer foam (Foam), Honeycomb (Honeycomb), balsa wood (Balsa wood). The method of claim 8,
The first face plate and the second face plate is a sandwich panel, characterized in that it comprises a material selected from metal (Metal), polymer composite (metal composite), metal composite (Metal composite). The method of claim 8,
The sandwich panel, wherein the first face member, the second face member and the insert are all made of the same material. (a) providing an insertion hole penetrating in the thickness direction in the core material;
(b) preparing an insert for insertion into the insertion hole;
(c) inserting the insert into the insertion hole;
(d) bonding the first and second face members to one side and the other side of the core member into which the insert is inserted by using an adhesive;
(e) a bagging step of wrapping an intermediate body having the first face member and the second face member bonded to the core member with a vacuum bag; And
(F) a curing step of heating and pressurizing the intermediate contained in the vacuum bag (Curing); manufacturing method of a sandwich panel comprising a. The method of claim 18,
Step (b) includes the step of providing a fastening hole in the insert in the longitudinal direction,
And (d) providing a coupling hole in the second face member to communicate with the coupling hole before the step (d). The method of claim 18,
The step (b)
A first flange for supporting the first face member, a second flange for supporting the second face member, a web connecting the first flange and the second flange, a head tip provided on an upper surface of the second flange, and Preparing an insert body having a fastening hole extending through the head tip and the second flange into the web;
Disposing a filler between the first flange and the second flange to surround the web; and
Wrapping the filler circumference with a reinforcing sheet,
The method of manufacturing a sandwich panel, further comprising the step of providing a coupling hole to which the head tip is coupled to the second face member before the step (d). 21. The method of claim 20,
The step (b) further comprises the step of bending the end of the reinforcing sheet protruding from the first flange or the second flange. 21. The method of claim 20,
The step (b) further comprises the step of wrapping the reinforcement sheet with a reinforcement cylinder. 21. The method of claim 20,
The method of manufacturing a sandwich panel, characterized in that at the step (f) curing the reinforcing sheet at the same time while curing the core material, the first face material and the second face material.

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