TW201819160A - Manufacturing method of composite material housing capable of having flat appearance and easy for coloring - Google Patents

Abstract

A manufacturing method of composite material housing includes a material preparation step and a forming step. In the material preparation step, a plurality of layers of sheet molding films and a plurality of layers of carbon fiber prepreg materials are stacked into a substrate, wherein at least one layer of sheet molding film sheet is located on the outmost side. By making the sheet molding material into a thinner sheet molding film, it can reduce the effect caused by large shrinkage rate. In the forming step, the substrate is placed in a mold and hot-pressed into a composite material housing. The sheet molding film located on the outer side will become flat after hot pressing due to thin thickness, and may keep the characteristic for easy coloring and also the advantages of carbon fiber prepreg material for having light weight and excellent strength.

Description

Manufacturing method of composite material shell

The present invention relates to a method for manufacturing a casing, in particular to a method for manufacturing a composite material casing having a carbon fiber prepreg material and a compression-molded diaphragm.

With the continuous development of various electronic product technologies and the increase in popularity, the functionality and appearance of electronic product casings have also been valued, especially the visual perception of the casing directly affects consumers' first impression of the product. Sheet molding compound (SMC) is a material obtained by impregnating a pasty mixture of resin, filler, hardener, and modifier into a glass mat or a cut glass yarn bundle, and heating and molding. Molded materials have the advantage of being easy to color, so they are often used to make a variety of shells to improve the visual experience of the product.

However, when the shell is directly made from a single piece of molding material, the cured shell has a large curing shrinkage and a thick thickness, which makes the molded shell have problems such as rough surface, unstable dimensions and warpage, so it needs to be carried out separately. Surface treatment to make the appearance of the shell smooth and beautiful, which results in an increase in the number of processes, and because the roughness and warping of each shell are different, the difficulty of surface treatment is increased.

Therefore, an object of the present invention is to provide a composite material shell with a flat appearance and the advantage of easy coloring of a molded material.

Therefore, the manufacturing method of the composite material shell of the present invention includes a material preparation step and a molding step.

In the material preparation step, a plurality of layers of compression-molded membranes and a plurality of layers of carbon fiber prepreg are stacked into a substrate, and at least one layer of the compression-molded membrane is located at the outermost side. By making the molding material into a thin molding film, the influence caused by the large shrinkage rate can be reduced.

In the forming step, the substrate is placed in a mold and hot-pressed into a composite shell. The compression-molded film located on the outside will be flattened due to the thin thickness after hot-press molding, and still retain the characteristics of easy coloring. At the same time, it also has the advantages of light weight and high strength of carbon fiber prepreg.

The effect of the present invention is: stacking the thin molded films and carbon fiber prepregs on top of each other, so that the molded films have a flat appearance and stable dimensions after molding, and the molded films located on the outside can be based on demand. Coloring enhances the visual perception and texture of the composite shell.

Referring to FIG. 1, an embodiment of a method for manufacturing a composite material casing according to the present invention includes a material preparation step 11 and a molding step 12.

Referring to FIG. 1 and FIG. 2, in the material preparation step 11, a plurality of layers of a molded film 21 made of a sheet molding compound (SMC) and a plurality of layers of carbon fiber prepreg 22 are prepared. The compression-molded membranes 21 and the carbon fiber prepreg 22 are stacked alternately with each other, and two of the compression-molded membranes 21 are located on both sides as shown in FIG. 2, so as to be stacked into a substrate 3.

Referring to FIG. 1 and FIG. 3, in the forming step 12, a mold 4 is prepared. The mold 4 includes an upper mold 41 surrounding a cavity 410 and a lower mold 42 with a module 420. The base material 3 stacked in the preparation step 11 is placed on the module 420 of the lower mold 42, and then the upper mold 41 and the lower mold 42 are paired to perform hot-press molding. During the hot-press molding process, the The substrate 3 is squeezed into the cavity 410 by the module 420 to form a mold state. Finally, the upper mold 41 is separated from the lower mold 42 to obtain a composite material shell 5. The composite casing 5 has an outer surface 51 formed by an outermost molded film 21 and an inner surface 52 opposite to the outer surface 51 and formed by another molded film 21. The outer surface 51 and the inner surface 52 have a flat appearance and are easy to be colored, so they can be colored according to different design requirements and improve the visual effect of the appearance. In addition, through different designs of the mold 4, a composite material shell 5 having different features 53 can be formed according to requirements. In this embodiment, the feature 53 is a hem, but not limited thereto. It should be particularly noted that, in the preparation step 11, only one of the compression-molded membrane sheets 21 is located on the outside, so that the inner surface 52 of the composite material shell 5 is formed by one of the carbon fiber prepreg materials 22, This configuration can bring different appearance effects, and the inner surface formed by the carbon fiber prepreg 22 also has a flat appearance without additional post-processing.

By making the molded material into a thin molded film 21, the fiber length can be shortened and the shrinkage rate can be effectively reduced, and the molded film 21 is made of carbon fiber with higher strength and flatter shape after molding. The impregnating materials 22 are stacked alternately with each other, thereby enhancing the strength of the composite material casing 5 and making the outer surface 51 of the composite material casing 5 easy to be colored and flat in appearance, effectively improving the visual sense and facilitating various designs.

In summary, by molding the molded material into a short-molded molded film 21, it is possible to avoid a large shrinkage rate and cause uneven appearance after molding, so that the outer surface of the obtained composite material casing 5 51 and the inner surface 52 are flat in appearance and easy to be colored, so they can indeed achieve the purpose of the present invention.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited in this way, any simple equivalent changes and modifications made in accordance with the scope of the patent application and the content of the patent specification of the present invention are still Within the scope of the invention patent.

11‧‧‧ preparation steps

12‧‧‧forming steps

21‧‧‧ Moulded diaphragm

22‧‧‧Carbon fiber prepreg

3‧‧‧ substrate

4‧‧‧Mould

41‧‧‧Up mold

410‧‧‧mould cavity

42‧‧‧mould

420‧‧‧module

5‧‧‧Composite material shell

51‧‧‧outer surface

52‧‧‧Inner surface

53‧‧‧ Features

Other features and effects of the present invention will be clearly presented in the embodiment with reference to the drawings, in which: FIG. 1 is a flowchart illustrating an embodiment of a method for manufacturing a composite material shell of the present invention; FIG. 2 is a schematic view Illustrates a material preparation step in this embodiment; and FIG. 3 is a schematic diagram illustrating a forming step in this embodiment.

Claims (3)

A method for manufacturing a composite material shell, comprising: a material preparation step of stacking a plurality of layers of compression-molded membranes and a plurality of layers of carbon fiber prepreg into a base material, and at least one layer of the compression-molded membranes is located at the outermost side; The substrate is placed in a mold and hot-pressed into a composite shell. The method for manufacturing a composite material casing according to claim 1, wherein, in the material preparation step, the compression-molded diaphragms and the carbon fiber prepreg are stacked alternately with each other. The method for manufacturing a composite material casing according to claim 1, wherein, in the forming step, the mold includes an upper mold surrounding a cavity, and a lower mold formed with a module, and the substrate is placed in the mold. The lower mold is on the module, and when the lower mold and the upper mold are aligned, the substrate is squeezed into the cavity by the module.