Novel mold structure for compression molding process of fiber reinforced composite material

Abstract

The utility model relates to a novel mould structure for a compression molding process of a fiber reinforced composite material, which comprises an upper mould and a lower mould which are used for compression molding of the fiber reinforced composite material, and connecting devices which are matched with each other are arranged on the upper mould and the lower mould; an upper cavity is formed in the upper die, a lower cavity matched with the upper cavity is formed in the lower die, an ejection block groove is further formed in the lower die in the lower cavity, an ejection block is arranged in the ejection block groove, and concave-convex matching surfaces matched with each other are arranged on the upper die at the upper cavity and the lower die at the lower cavity. A yarn clamping position used for being matched with the concave-convex matching face and an overflow groove used for being matched with the yarn clamping position are formed in the position, on the concave-convex matching face, of the lower die. According to the utility model, the yarn clamping thickness can be reduced, the compactness of a product is increased, and the size of the product is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a mould, in particular to a novel mould structure of fibre reinforced composite material mould pressing forming process. BACKGROUND

[0002] With the development of high-tech industries such as aviation, aerospace, automobile, etc., composite material mould pressing forming gradually becomes the mainstream process of replacing hot pressing tank forming technology and vacuum bag pressing forming technology.As a kind of efficient forming mode, composite material mould pressing forming can guarantee product quality, and has been widely applied in military field, aerospace field and civil field, and the wide application of composite material promotes the development of its forming technology.However, the traditional mould pressing structure is to middle or upper surface edge type, and the structure is too simple, and its defects are easy to clamp yarn, the filler cannot be more, and after clamping yarn, the product is easy to produce lack of shape and internal defects, and then leads to product size out-of-tolerance and scrap. CONTENT OF THE UTILITY MODEL

[0003] The utility model provides a novel mould structure of fibre reinforced composite material mould pressing forming process that can reduce the thickness of clamping yarn, increase the compactness of product and guarantee the size of product for solving the technical problems of prior art.

[0004] The technical problems solved by the utility model are solved through the following technical solutions.The utility model is a novel mould structure of fibre reinforced composite material mould pressing forming process, which comprises an upper die and a lower die for fibre reinforced composite material mould pressing forming, and connecting devices for mutual cooperation are arranged on the upper die and the lower die;an upper cavity is arranged on the upper die, a lower cavity for cooperating with the upper cavity is arranged on the lower die, an ejection block groove is further arranged in the lower die in the lower cavity, an ejection block is arranged in the ejection block groove, concave-convex matching surfaces for mutual cooperation are arranged on the upper die at the upper cavity and on the lower die at the lower cavity, and yarn clamping positions for cooperating with the concave-convex matching surfaces and overflow grooves for cooperating with the yarn clamping positions are arranged on the lower die at the concave-convex matching surfaces.

[0005] The technical problems solved by the utility model can be further solved through the following technical solutions.For the novel mould structure of fibre reinforced composite material mould pressing forming process, the connecting devices comprise guide sleeves arranged on the upper die and guide columns arranged on the lower die, and the upper die and the lower die are positioned and connected through cooperation of the guide sleeves and the guide columns.

[0006] The technical problems solved by the utility model can be further solved through the following technical solutions.For the novel mould structure of fibre reinforced composite material mould pressing forming process, handles for facilitating hoisting and dismounting or mold closing operation are welded on the upper die and the lower die.

[0007] The technical problems solved by the utility model also can be further realized through following technical scheme, for the novel mold structure of fiber reinforced composite material moulding process above, still be provided with pry mould groove on the lower mould, the depth of pry mould groove is 6~10mm, the width is 20~40mm.

[0008] The technical problems solved by the utility model also can be further realized through following technical scheme, for the novel mold structure of fiber reinforced composite material moulding process above, the depth of the concave-convex matching surface is 6~10mm, and the matching gap is 0~0.05mm.

[0009] The technical problems solved by the utility model also can be further realized through following technical scheme, for the novel mold structure of fiber reinforced composite material moulding process above, the depth of the concave-convex matching surface is 6~10mm, and the matching gap is 0~0.05mm.

[0010] The technical problems solved by the utility model also can be further realized through following technical scheme, for the novel mold structure of fiber reinforced composite material moulding process above, the depth of the concave-convex matching surface is 6~10mm, and the matching gap is 0~0.05mm.

[0011] The technical problems solved by the utility model also can be further realized through following technical scheme, for the novel mold structure of fiber reinforced composite material moulding process above, the depth of the concave-convex matching surface is 6~10mm, and the matching gap is 0~0.05mm.

[0012] Compared with the prior art, the novel mold structure of fiber reinforced composite material moulding process provided by the utility model increases the concave-convex surface matching between the upper and lower moulds, moves the parting surface upwards, solves the yarn clamping problem when the filler is much, is superior to the centering or upper surface corner parting design, and the matching gap is small, so that even if the filler interference is adjusted, only the resin and gas can overflow during high-temperature and high-pressure forming, avoids the existence of yarn clamping phenomenon, and solves the yarn clamping defect and internal defect problems of the traditional moulding structure. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural schematic view of the utility model;

[0014] Figure 2 It is a structural schematic view of the lower mould of the utility model;

[0015] Figure 3 It is a structural schematic view of the upper mould of the utility model;

[0016] Figure 4The utility model discloses a structure diagram of the concave-convex cooperation surface of upper and lower moulds. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantage of the utility model embodiment more clear, the technical scheme in the utility model embodiment will be clearly and completely described below in conjunction with the drawings of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0018] REFERENCE Figures 1-4 A novel mould structure of fibre reinforced composite material mould pressing forming process, the mould structure includes the upper mould 1 and lower mould 2 for fibre reinforced composite material mould pressing forming, and connecting device for mutual cooperation is installed on the upper mould 1 and lower mould 2;The upper mould 1 and lower mould 2 as the main component of mould pressing forming, jointly constitute the cavity required for forming;The upper mould 1 is usually fixed in the upper of press, and the lower mould 2 is fixed in the lower of press, and the composite material is formed by pressing in the cavity by the pressure of press;The connecting device ensures the stability and accuracy of the upper mould 1 and lower mould 2 in the process of mould closing, avoids the forming defects caused by the dislocation of mould, and preferably, the connecting device includes guide sleeve 7 arranged on the upper mould 1 and guide column 6 arranged on the lower mould 2, and the upper mould 1 and lower mould 2 are positioned and connected by the cooperation of guide sleeve 7 and guide column 6.

[0019] The upper mould 1 is provided with upper cavity 21, and the lower mould 2 is provided with lower cavity 11 for cooperating with upper cavity 21, and upper cavity 21 and lower cavity 11 cooperate to form the forming space of composite material, and the specific design needs to be accurately calculated according to the shape and size of product to ensure that the product after forming meets the design requirements.

[0020] The lower mould 2 in the lower cavity 11 is also provided with an ejection block groove 31, and the ejection block groove 31 is provided with an ejection block 3 for ejecting the product from the mould after forming, and the design of the ejection block 3 needs to consider the structure and material properties of the product to avoid damage to the product during ejection.

[0021] The upper mould 1 at the upper cavity 21 and the lower mould 2 at the lower cavity 11 are provided with concave-convex cooperation surfaces 10 for mutual cooperation, which not only enhances the sealing property of the mould, but also improves the forming precision of the product, and can move the parting surface 12, solve the problem of yarn clamping when filling material is more;The cooperation depth and cooperation gap of the concave-convex cooperation surface 10 need to be strictly controlled to ensure the stability and accuracy of the mould in the process of mould closing, and preferably, the cooperation depth of the concave-convex cooperation surface 10 is 6-10mm, and the cooperation gap is 0-0.05mm.

[0022] The lower mold 2 at the concave-convex matching surface 10 is provided with a yarn clamping position 5 for matching with the concave-convex matching surface 10 and an overflow groove 4 for matching with the yarn clamping position 5. The yarn clamping position 5 is used to extrude the excess composite material during molding, and the depth and width of the yarn clamping position 5 need to be accurately calculated according to the characteristics of the fiber material and the design requirements of the product. Preferably, the depth of the yarn clamping position 5 is 0.2-0.6 mm, and the width is 5-8 mm. At the same time, the overflow groove 4 is provided beside the yarn clamping position 5, which is used to discharge the excess resin or molten material during the molding process to avoid molding defects. Preferably, the depth of the overflow groove 4 is 0.5-1.5 mm, and the width is 6-8 mm.

[0023] In actual use, in order to facilitate the lifting and assembling of the mold, handles 8 are welded on the upper mold 1 and the lower mold 2;

[0024] In order to use a crowbar or other tools to pry open the mold when needed, the operating convenience of the mold is improved, and a mold prying groove 9 is also provided on the lower mold 2. Preferably, the depth of the mold prying groove 9 is 6-10 mm, and the width is 20-40 mm.

[0025] The upper mold 1, the lower mold 2 and the ejection block 3 are all metal materials, and are selected from any one of carbon steel, stainless steel, copper, aluminum alloy and titanium alloy, which have good strength and wear resistance, and can meet the stability and durability requirements of the mold during long-term use.

[0026] The specific molding process of the mold structure is as follows:

[0027] 1. The carbon fiber prepreg (i.e. a material in which carbon fiber reinforced material is pre-impregnated with resin matrix and dried) is cut and laid according to design requirements;

[0028] 2. The cut carbon fiber prepreg is placed in the metal mold, and uniform distribution is ensured to avoid the phenomenon of bridging or fiber twisting. At the same time, the upper and lower molds 2 of the mold are installed, and the mold closing accuracy is adjusted;

[0029] During mold closing, the excess carbon fiber and resin are extruded into the yarn clamping position 5 and the overflow groove 4 by the concave-convex matching surface 10, ensuring the compactness of the product;

[0030] 3. The mold is placed on a hydraulic molding table, a certain pressure is applied, and the carbon fiber prepreg is tightly fitted in the mold. Then, curing treatment is carried out in a high temperature environment, so that the resin matrix undergoes chemical reaction and solidification molding;

[0031] During molding, the excess composite material and the excess resin can overflow through the yarn clamping position 5 and the overflow groove 4, avoiding the existence of yarn clamping phenomenon;

[0032] 4. After the product is completely cured, open the mold and take out the shaped carbon fiber composite material product.

Claims

1. A new mould structure for fibre reinforced composite compression moulding process, characterized by: The mold structure comprises an upper mold and a lower mold for fiber reinforced composite material compression molding, and connecting devices for mutual cooperation are installed on the upper mold and the lower mold; an upper cavity is arranged on the upper mold, a lower cavity for cooperating with the upper cavity is arranged on the lower mold, an ejection block groove is further arranged in the lower mold in the lower cavity, an ejection block is arranged in the ejection block groove, concave-convex cooperation surfaces for mutual cooperation are arranged on the upper mold at the upper cavity and on the lower mold at the lower cavity, a yarn clamping position for cooperating with the concave-convex cooperation surfaces and an overflow groove for cooperating with the yarn clamping position are arranged on the lower mold at the concave-convex cooperation surfaces.

2. The novel mould structure for fibre reinforced composite material compression moulding process as claimed in claim 1 wherein: The connecting devices comprise guide sleeves arranged on the upper mold and guide columns arranged on the lower mold, and the upper mold and the lower mold are positioned and connected through cooperation of the guide sleeves and the guide columns.

3. The new mould structure for fibre reinforced composite material compression moulding process according to claim 1 or 2, characterized in that: Handles for facilitating hoisting and dismounting or mold closing operation are welded on the upper mold and the lower mold.

4. The novel mold structure for fiber reinforced composite material compression molding process as claimed in claim 1, wherein: A mold prying groove is further arranged on the lower mold, and the depth of the mold prying groove is 6-10 mm and the width is 20-40 mm.

5. The novel mold structure for fiber reinforced composite material compression molding process as claimed in claim 1, wherein: The cooperation depth of the concave-convex cooperation surfaces is 6-10 mm, and the cooperation gap is 0-0.05 mm.

6. The novel mold structure for fiber reinforced composite material compression molding process as claimed in claim 1 wherein: The depth of the yarn clamping position is 0.2-0.6 mm, and the width is 5-8 mm.

7. The novel mold structure for fiber reinforced composite material compression molding process as claimed in claim 1 wherein: The depth of the overflow groove is 0.5-1.5 mm, and the width is 6-8 mm.

8. The novel mold structure for fiber reinforced composite material compression molding process as claimed in claim 1 wherein: The upper mold, the lower mold and the ejection block are all metal materials, and are selected from any one of carbon steel, stainless steel, copper, aluminum alloy and titanium alloy.

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