阅读说明：本技术 带内螺纹定位金属镶嵌件的泡沫夹层复材制件及制造方法 (Foam sandwich composite material part with internal thread positioning metal insert and manufacturing method thereof ) 是由 顾勇涛 陈建旭 陈永 岳海亮 朱坤坤 于 2019-09-27 设计创作，主要内容包括：本发明公开了一种带内螺纹定位金属镶嵌件的泡沫夹层复材制件及制备方法,所述制件包括：PMI泡沫、上蒙皮、下蒙皮和金属镶嵌件,所述金属镶嵌件镶置在所述PMI泡沫中；所述PMI泡沫放置于所述上蒙皮和所述下蒙皮之间,所述PMI泡沫上设有沉嵌件孔；所述上蒙皮包括PMI泡沫上表面向上依次设置的增强纤维布层和玻璃纤维布层；所述下蒙皮包括PMI泡沫下表面向下依次设置的增强纤维布层和玻璃纤维布层。本发明带内螺纹定位金属镶嵌件的泡沫夹层复材制件及制造方法,获得的复合材料夹层结构具有良好的整体性能,较高的抗拉拔强度以及较精度的成型定位。(The invention discloses a foam interlayer composite material part with an internal thread positioning metal insert and a preparation method thereof, wherein the part comprises the following components: the PMI foam comprises PMI foam, an upper skin, a lower skin and a metal insert, wherein the metal insert is embedded in the PMI foam; the PMI foam is placed between the upper skin and the lower skin, and a sunk insert hole is formed in the PMI foam; the upper skin comprises a reinforcing fiber cloth layer and a glass fiber cloth layer which are sequentially arranged on the upper surface of the PMI foam upwards; the lower skin comprises a reinforcing fiber cloth layer and a glass fiber cloth layer which are sequentially arranged downwards on the lower surface of the PMI foam. According to the foam sandwich composite material part with the internal thread positioning metal insert and the manufacturing method thereof, the obtained composite material sandwich structure has good overall performance, high tensile strength and high precision forming and positioning.)

1. The utility model provides a take foam intermediate layer combined material finished piece of internal thread location metal insert which characterized in that includes: the PMI foam is provided with a sunk insert hole, and the metal insert is embedded in the sunk insert hole; the PMI foam is placed between the upper skin and the lower skin; the upper skin comprises a reinforced fiber cloth layer and a glass fiber cloth layer which are sequentially arranged on the upper surface of the PMI foam in an upward direction; the lower skin comprises a reinforcing fiber cloth layer and a glass fiber cloth layer which are sequentially arranged on the lower surface of the PMI foam downwards.

2. The foam sandwich composite member with internal threaded positioning metal inserts as claimed in claim 1 wherein the metal inserts are attached to the PMI foam by an epoxy adhesive film.

3. The foam sandwich composite member with internal threaded positioning metal inserts of claim 1 wherein the upper skin is attached to the PMI foam with an epoxy film.

4. The foam sandwich composite member with internal threaded positioning metal inserts of claim 1 wherein the lower skin is attached to the PMI foam with an epoxy film.

5. The foam sandwich composite member with internally threaded locating metal inserts as claimed in claim 1 wherein said metal inserts are i-shaped.

6. The foam sandwich composite member with internal thread positioning metal insert of claim 5 wherein said upper skin is applied to the upper surface of the i-shape of said metal insert and exposes the screw hole of said metal insert and said lower skin is applied to the lower surface of the i-shape of said metal insert.

7. The method for manufacturing a foam sandwich composite part with an internally threaded positioning metal insert according to any one of claims 1 to 6, comprising the following steps:

(1) machining insert holes in PMI foam: machining a through hole in the PMI foam by using a machine tool, and machining according to the requirements of a drawing;

(2) PMI foam heat treatment: heat-treating the PMI foam processed in the step (1);

(3) winding the metal insert with an adhesive film: wiping the metal insert by alcohol, airing for 5 minutes, and then winding an epoxy glue film;

(4) PMI foam adhesive spreading film: paving epoxy glue films on the front side and the back side of the PMI foam, and leaking out the metal insert screw holes;

(5) laying an upper skin and a lower skin on a workpiece: the laying mode adopts a mode of up-down circulation and C-shaped lap joint;

(6) and (3) entering a mold to fix the insert: the screw hole of the insert is required to be vertical to the bolt hole of the die, the bolt is locked, and the package is solidified;

(7) demolding: and (5) after the curing is finished, demolding to obtain the product.

8. The method for manufacturing a foam sandwich composite material part with an internal thread positioning metal insert as claimed in claim 7, wherein in the step (3), the metal insert is in an I shape, black foaming glue is wound in the middle of the I shape, the size of the black foaming glue is slightly smaller than the cross section of the metal insert, a layer of glue film is wound, and finally PMI foam is embedded.

Technical Field

The invention belongs to the technical field of composite materials, and relates to a foam sandwich structure of a carbon fiber composite material belt internal thread positioning metal insert and a manufacturing process method thereof.

Background

At present, the composite material sandwich structure has higher bending-resistant height, and can meet the requirement of rigidity with minimum mass. And parts are connected, and the foam sandwich part with the sandwich structure composite material embedded with the metal insert is widely applied to the fields of aerospace industry, aviation industry and automobiles.

The existing foam sandwich composite material part with the internal thread positioning metal insert is mainly formed by secondary cementing of the metal insert and a composite material foam sandwich part. This approach has the following disadvantages:

firstly, the process is long and the efficiency is low: (1) molding and manufacturing the composite material foam sandwich piece; (2) drilling holes on the composite material foam sandwich piece; (3) the metal insert is glued with the composite material foam sandwich piece.

Secondly, the quality defect is as follows: (1) the metal insert is inaccurate in positioning and large in dimensional tolerance. (2) The metal nut insert is glued to the foam, and the nut is easy to rotate in torque. (3) The structural clamping of the foam and the metal insert cannot be realized by the adhesive bonding of the metal nut insert, the metal nut insert is pulled easily by tensile force, (4) the section of the metal nut insert is not covered by a skin, and the judgment is influenced by the cracks around the stressed metal insert. (5) The skin is used for making holes, so that the rigidity and the strength of a finished piece are influenced.

Therefore, how to solve the above problems is a matter of important research and solution for those skilled in the art.

Disclosure of Invention

The invention mainly solves the technical problem of providing a foam interlayer composite material part with an internal thread positioning metal insert and a manufacturing method thereof, and the obtained composite material interlayer structure has good overall performance, higher tensile strength and higher precision in molding and positioning.

In order to solve the technical problems, the invention adopts a technical scheme that: the utility model provides a take foam interlayer combined material finished piece of internal thread location metal insert, includes: the PMI foam is provided with a sunk insert hole, and the metal insert is embedded in the sunk insert hole; the PMI foam is placed between the upper skin and the lower skin; the upper skin comprises a reinforced fiber cloth layer and a glass fiber cloth layer which are sequentially arranged on the upper surface of the PMI foam in an upward direction; the lower skin comprises a reinforcing fiber cloth layer and a glass fiber cloth layer which are sequentially arranged on the lower surface of the PMI foam downwards.

In a preferred embodiment of the present invention, the metal insert and the PMI foam are connected by an epoxy film.

In a preferred embodiment of the present invention, the upper skin and the PMI foam are connected by an epoxy film.

In a preferred embodiment of the present invention, the lower skin and the PMI foam are connected by an epoxy film.

In a preferred embodiment of the invention, the metal insert is i-shaped.

In a preferred embodiment of the present invention, the upper skin is applied to an upper i-shaped surface of the metal insert with the screw hole of the metal insert exposed, and the lower skin is applied to a lower i-shaped surface of the metal insert.

In order to solve the technical problem, the invention adopts another technical scheme that: the method for manufacturing the foam interlayer composite material part with the internal thread positioning metal insert specifically comprises the following steps:

the method specifically comprises the following steps:

(1) machining insert holes in PMI foam: machining a through hole in the PMI foam by using a machine tool, and machining according to the requirements of a drawing;

(2) PMI foam heat treatment: heat-treating the PMI foam processed in the step (1);

(3) winding the metal insert with an adhesive film: wiping the metal insert by alcohol, airing for 5 minutes, and then winding an epoxy glue film;

(4) PMI foam adhesive spreading film: paving epoxy glue films on the front side and the back side of the PMI foam, and leaking out the metal insert screw holes;

(5) laying an upper skin and a lower skin on a workpiece: the laying mode adopts a mode of up-down circulation and C-shaped lap joint;

(6) and (3) entering a mold to fix the insert: the screw hole of the insert is required to be vertical to the bolt hole of the die, the bolt is locked, and the package is solidified;

(7) demolding: and (5) after the curing is finished, demolding to obtain the product.

In a preferred embodiment of the present invention, in the step (3), the metal insert is i-shaped, black foaming glue is wound in the middle of the i-shaped metal insert, the size of the black foaming glue is slightly smaller than the cross section of the metal insert, a glue film is wound, and finally PMI foam is inserted.

The invention has the beneficial effects that: the foam interlayer composite material part with the internal thread positioning metal insert and the manufacturing method thereof have the following advantages:

(1) the efficiency and the productivity are improved, and the manufacturing process method improves the efficiency and shortens the period of the finished piece;

(2) the position and the size of the metal insert are ensured more accurately;

(3) the torque data of the metal nut insert is greatly improved;

(4) the metal nut insert is designed with a structural clamping position in which an I shape is matched with foam, thereby structurally solving the possibility of easy pulling out of the metal insert;

(5) the section of the metal nut insert is coated by the skin, so that cracks around the stressed metal insert are avoided, and the metal insert is further protected from being pulled out;

(6) compared with the prior structure, the skin structure has high rigidity and stable strength.

Drawings

FIG. 1 is a schematic structural view of a preferred embodiment of the foam sandwich composite article with internally threaded positioning metal inserts of the present invention;

the parts in the drawings are numbered as follows: 1-PMI foam, 2-upper skin, 3-lower skin, 4-metal insert.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.

Referring to fig. 1, an embodiment of the present invention includes:

a foam sandwich composite part with internal thread positioning metal inserts 4, comprising: PMI foam 1, upper skin 2, lower skin 3 and metal insert 4.

The PMI foam 1 is placed between the upper skin 22 and the lower skin 3; the upper skin 2 comprises a reinforcing fiber cloth layer and a glass fiber cloth layer which are sequentially arranged on the upper surface of the PMI foam 1 upwards; the lower skin 3 comprises a reinforcing fiber cloth layer and a glass fiber cloth layer which are sequentially arranged on the lower surface of the PMI foam 1 downwards. The upper skin 2 and the PMI foam 1 are connected through an epoxy film. The lower skin 3 and the PMI foam 1 are connected through an epoxy film.

PMI foam 1 is last to be equipped with heavy inserts hole, metal inserts 4 inlay and put in the heavy inserts hole of PMI foam 1, metal inserts 4 with connect with epoxy membrane between the PMI foam 1. In this embodiment, metal inlay 4 is the I shape, it is the through-hole to sink the inserts hole, metal inlay 4 places in the through-hole, the screw hole of the upper surface of the I shape of metal inlay 4 exposes, and other parts quilt go up covering 2 and cover together, the lower surface of the I shape of metal inlay 4 quilt covering 3 down together.

The manufacturing method of the foam interlayer composite material part with the internal thread positioning metal insert 4 specifically comprises the following steps:

(1) machining insert holes in PMI foam: machining a through hole in the PMI foam 1 by using a machine tool, and machining according to the requirements of a drawing;

(2) PMI foam heat treatment: heat-treating the PMI foam 1 processed in the step (1);

(3) winding the metal insert with an adhesive film: wiping the metal insert 4 with alcohol, airing for 5 minutes, winding an epoxy glue film, winding black foaming glue in the middle of an I-shaped part, winding a layer of glue film, and finally embedding PMI foam 1;

(4) PMI foam adhesive spreading film: paving epoxy glue films on the front side and the back side of the PMI foam 1, and leaking out the metal insert screw holes;

(5) paving an upper skin and a lower skin 3 on the workpiece: the laying mode adopts a mode of up-down circulation and C-shaped lap joint;

(6) and (3) entering a mold to fix the insert: the screw hole of the insert is required to be vertical to the bolt hole of the die, the bolt is locked, and the package is solidified;

(7) demolding: and (5) after the curing is finished, demolding to obtain the product.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.