Cylindrical carbon fiber product forming die

Abstract

The utility model discloses a cylindrical carbon fiber product forming mould, a lower mould assembly is fixedly installed at the bottom of an installation frame, an upper mould assembly is correspondingly arranged above the lower mould assembly and is connected with a lifting mechanism installed on the installation frame, the lower mould assembly comprises a lower mould base and a lower mould core, a first air chamber is arranged in the lower mould base, the lower mould core is cylindrical, and a second air chamber is arranged in the lower mould core. The upper end of the lower die core is closed, the lower end of the lower die core is open, and the lower end opening is communicated with the first air chamber; the upper die assembly comprises an upper die base and upper die sleeves, the multiple upper die sleeves are fixedly installed in the upper die base to form multiple vertically-through through holes, when the lower die assembly and the upper die assembly are assembled, the lower die cores are inserted into the corresponding through holes, forming grooves are formed between the lower die cores and the upper die sleeves, and a second air chamber is arranged in the upper die base. A plurality of micro air holes communicated with the second air chamber are evenly distributed in the side wall of the upper die sleeve. According to the forming die, the density and the uniformity of the cylindrical carbon fiber part are effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to carbon fiber product forming equipment, concretely is a cylindrical carbon fiber product forming die. BACKGROUND

[0002] Carbon fiber heat preservation spare is a kind of heat preservation product made of carbon fiber material, with high strength, high modulus, low density, corrosion resistance, high temperature resistance and other excellent performance. Its excellent thermal stability and chemical stability make it become indispensable heat preservation material in the field of aerospace, automobile manufacturing, medical equipment and so on.

[0003] The forming mode of carbon fiber spare usually includes laminated curing forming, wet method filtration forming, mould pressing forming, autoclave forming and the like, wherein the wet method filtration forming is to mix chopped carbon fiber, binder and dispersant into uniform dispersion slurry, utilizes vacuum filtration forming method to obtain blank, and is made by drying, curing and carbonization process and the like. Because vacuum filtration mainly relies on vacuum to make carbon fiber be trapped in mold gradually and accumulate into shape by pressure difference, for cylindrical carbon fiber spare, when wet method filtration forming is used in the prior art, some difficulties are faced, for example, in the circumferential direction of cylindrical carbon fiber spare, it is difficult to ensure thickness completely uniform by vacuum filtration, which affects the density and uniformity of finished product. SUMMARY

[0004] In view of the problems existing in the prior art, the utility model provides a cylindrical carbon fiber product forming die, which aims at improving the density and uniformity of cylindrical carbon fiber spare.

[0005] The utility model employs the technical scheme as follows: cylindrical carbon fiber product forming die, including mounting bracket, lower die assembly, upper die assembly, the lower die assembly is fixedly installed at the bottom of the mounting bracket, the upper die assembly is correspondingly set in the upper of the lower die assembly, and is connected with the lifting mechanism installed on the mounting bracket, the lifting mechanism drives the upper die assembly moves up and down along the vertical direction to realize the closing and opening of the lower die assembly with the lower die assembly;

[0006] The lower die assembly includes lower die seat and lower die core, a plurality of lower die cores are fixedly installed on the lower die seat, a first air chamber is arranged in the lower die seat, the first air chamber is connected with air source through first connecting pipe, the air source provides vacuum negative pressure and blowing positive pressure, the lower die core is in the shape of cylinder, and the upper end is closed and the lower end is open, the lower end opening is communicated with the first air chamber, and a plurality of micro air holes are uniformly distributed on the cylinder wall of the lower die core;

[0007] The upper die assembly comprises an upper die seat, an upper die sleeve, a plurality of upper die sleeves are fixedly installed in the upper die seat to form a plurality of through holes, when the lower die assembly and the upper die assembly are closed, the lower die core is inserted into the corresponding through hole to form a forming groove between the lower die core and the upper die sleeve, a second air chamber is arranged in the upper die seat, the second air chamber is connected with an air source through a second connecting pipe, the air source provides vacuum negative pressure and blowing positive pressure, a plurality of micro air holes which are in communication with the second air chamber are uniformly distributed on the side wall of the upper die sleeve.

[0008] Further, the lower die seat comprises a lower die frame, a lower die seat top plate is fixedly installed on the top of the lower die frame, a partition plate is arranged in the lower die frame, the first air chamber is formed between the lower die seat top plate and the partition plate, and the bottom of the lower die core is fixedly installed on the top of the lower die frame.

[0009] Further, one end of the first connecting pipe is located below the partition plate, and a plurality of air holes which are in communication with the first air chamber are uniformly arranged on the first connecting pipe.

[0010] Further, the upper die seat comprises an upper die frame, an upper die top plate and an upper die bottom plate which are fixedly connected with the upper die frame, the upper end and the lower end of the upper die sleeve are fixedly connected with the upper die top plate and the upper die bottom plate respectively, and the cavity formed between the upper die frame, the upper die top plate, the upper die bottom plate and the upper die sleeve forms the second air chamber.

[0011] Further, a plurality of air vibrators are fixedly installed on the upper die seat.

[0012] Further, the lifting mechanism comprises a lifting cylinder, the lifting cylinder is fixedly installed on the mounting frame, the piston rod end of the lifting cylinder is connected with the upper die assembly through a connecting frame, guide rods are fixedly connected on the two sides of the connecting frame respectively, and the guide rods are in sliding fit with guide sleeves arranged on the mounting frame.

[0013] In the forming process of the cylindrical carbon fiber product, when the upper die assembly and the lower die assembly of the forming die are closed, the forming groove is accurately formed between the upper die sleeve and the lower die core, the negative pressure is synchronously introduced into the upper die and the lower die during forming, and vacuum filtration is simultaneously performed on both sides of the forming groove, so that the carbon fiber slurry in the forming groove can be subjected to balanced suction force in all directions, the slurry flow deviation caused by unilateral filtration is effectively avoided, the carbon fiber can be uniformly distributed in the circumferential direction and the axial direction, the thickness uniformity of the whole cylindrical carbon fiber product is greatly improved, the physical properties of each part of the finished product tend to be consistent, and the stronger pressure difference driving force is formed by bilateral negative pressure filtration compared with unilateral filtration, under the synergistic action of the pressure difference on the inner side and the outer side, the carbon fiber can be more closely accumulated together, the internal pores are reduced, and the compactness of the product is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is the overall structure schematic view of the utility model.

[0015] Figure 2 is the structure schematic view of the lower die assembly of the utility model.

[0016] Figure 3 is the overhead schematic view of the lower die assembly of the utility model.

[0017] Figure 4 is Figure 3 the A-A direction section view.

[0018] Figure 5 is Figure 3 the B-B direction section view.

[0019] Figure 6 is the structure schematic view of the upper die assembly of the utility model.

[0020] Figure 7 is the overhead schematic view of the upper die assembly of the utility model.

[0021] Figure 8 is Figure 7 the C-C direction section view.

[0022] Figure 9 is the section schematic view of the lower die assembly and the upper die assembly in the die closing state. DETAILED DESCRIPTION

[0023] In order to facilitate understanding of the utility model, the following will be combined with the description of the drawings and the preferred embodiments of the utility model more comprehensive, detailed description, but the protection scope of the utility model is not limited to the following specific embodiments.

[0024] As Figure 1 shown, the embodiment provides a cylindrical carbon fiber product forming die, including mounting frame 100, lower die assembly 200, upper die assembly 300, lower die assembly 200 is fixedly installed at the bottom of mounting frame 100, upper die assembly 300 is correspondingly arranged above lower die assembly 200, and is connected with the lifting mechanism 400 installed on the mounting frame 100, the lifting mechanism 400 drives upper die assembly 300 to move up and down along the vertical direction to realize the die closing and opening of lower die assembly 200.In the embodiment, the lifting mechanism 400 includes lifting cylinder, the lifting cylinder is fixedly installed on the mounting frame 100, the piston rod end of the lifting cylinder is connected with the upper die assembly 300 through the connecting frame, the connecting frame both sides are fixedly connected with guide rod, and the guide rod is slidably connected with the guide sleeve arranged on the mounting frame 100.

[0025] As Figures 2-5As shown, the lower mold assembly 200 includes a lower mold base 201, a plurality of lower mold cores 202 fixedly installed on the lower mold base 201, and a first air chamber 206 arranged in the lower mold base 201. The first air chamber 206 is connected to a gas source through a first connecting pipe 203, and the gas source provides vacuum negative pressure and blowing positive pressure. The lower mold core 202 is in a cylindrical shape with a closed upper end and an open lower end, and the open lower end is in communication with the first air chamber 206. A plurality of micro-pores are uniformly distributed on the cylindrical wall of the lower mold core 202.

[0026] In this embodiment, the lower mold base 201 includes a lower mold frame 207, and a lower mold base top plate 208 is fixedly installed on the top of the lower mold frame 207. A partition plate 205 is arranged in the lower mold frame 207, and the first air chamber 206 is formed between the lower mold base top plate 208 and the partition plate 205. The bottom of the lower mold core 202 is fixedly installed on the top of the lower mold frame 207. One end of the first connecting pipe 203 is located below the partition plate 205, and a plurality of air holes 204 in communication with the first air chamber 206 are uniformly arranged on the first connecting pipe 203.

[0027] As shown in Figures 6-8 The upper mold assembly 300 includes an upper mold base 301 and a plurality of upper mold sleeves 308 fixedly installed in the upper mold base 301 to form a plurality of through holes 302. When the lower mold assembly 200 and the upper mold assembly 300 are combined, the lower mold core 202 is inserted into the corresponding through hole 302 to form a molding groove (see Figure 9 ) between the lower mold core 202 and the upper mold sleeve 308. The upper mold base 301 is provided with a second air chamber 307 connected to the gas source through a second connecting pipe 303, and the gas source provides vacuum negative pressure and blowing positive pressure. A plurality of micro-pores in communication with the second air chamber 307 are uniformly distributed on the side wall of the upper mold sleeve 308.

[0028] In this embodiment, the upper mold base 301 includes an upper mold frame 304, an upper mold top plate 305, and an upper mold bottom plate 306 fixedly connected to the upper mold frame 304. The upper and lower ends of the upper mold sleeve 308 are fixedly connected to the upper mold top plate 305 and the upper mold bottom plate 306, respectively. The cavity formed between the upper mold frame 304, the upper mold top plate 305, the upper mold bottom plate 306, and the upper mold sleeve 308 forms the second air chamber 307.

[0029] In this embodiment, a plurality of air vibrators are fixedly installed on the upper mold base 301. The air vibrators provide an auxiliary synergistic effect. During vacuum filtration, the fine vibrations generated by the air vibrators can promote the rapid discharge of gas bubbles in the carbon fiber slurry, avoid internal defects caused by residual gas bubbles, further optimize the internal structure of the product, and improve the density. At the same time, vibration also helps carbon fibers to be more uniformly dispersed, and cooperates with negative pressure to comprehensively strengthen the molding quality of the cylindrical carbon fiber product. During demolding, the air vibrators combined with the positive pressure source make the product more easily separated from the upper mold assembly.

[0030] Many modifications and other embodiments of the present applications set forth herein will come to mind to one skilled in the art to which these applications pertain having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the applications are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A forming mold for a cylindrical carbon fiber product, comprising a mounting frame (100), a lower mold assembly (200), and an upper mold assembly (300), characterized in that: The lower mold assembly (200) is fixedly installed at the bottom of the mounting rack (100), the upper mold assembly (300) is correspondingly arranged above the lower mold assembly (200) and is connected with the lifting mechanism (400) installed on the mounting rack (100), the lifting mechanism (400) drives the upper mold assembly (300) to move up and down along the vertical direction so as to realize the closing and opening of the mold with the lower mold assembly (200). The lower mold assembly (200) comprises a lower mold base (201) and a lower mold core (202), a plurality of lower mold cores (202) are fixedly installed on the lower mold base (201), a first air chamber (206) is arranged in the lower mold base (201), the first air chamber (206) is connected with a gas source through a first connecting pipe (203), the gas source provides vacuum negative pressure and blowing positive pressure, the lower mold core (202) is in a cylindrical shape with a closed upper end and an open lower end, the open lower end is communicated with the first air chamber (206), and a plurality of micro air holes are uniformly distributed on the cylindrical wall of the lower mold core (202). The upper mold assembly (300) comprises an upper mold base (301) and an upper mold sleeve (308), a plurality of upper mold sleeves (308) are fixedly installed in the upper mold base (301) to form a plurality of through holes (302) vertically penetrating the upper mold base (301), when the lower mold assembly (200) is combined with the upper mold assembly (300), the lower mold core (202) is inserted into the corresponding through hole (302) to form a forming groove between the lower mold core (202) and the upper mold sleeve (308), a second air chamber (307) is arranged in the upper mold base (301), the second air chamber (307) is connected with the gas source through a second connecting pipe (303), the gas source provides vacuum negative pressure and blowing positive pressure, and a plurality of micro air holes are uniformly distributed on the side wall of the upper mold sleeve (308) and communicated with the second air chamber (307).

2. The cylindrical carbon fiber product forming mold according to claim 1, characterized by: The lower mold base (201) comprises a lower mold frame (207), a lower mold base top plate (208) is fixedly installed on the top of the lower mold frame (207), a partition plate (205) is arranged in the lower mold frame (207), the first air chamber (206) is formed between the lower mold base top plate (208) and the partition plate (205), and the bottom of the lower mold core (202) is fixedly installed on the top of the lower mold frame (207).

3. The cylindrical carbon fiber product forming mold according to claim 2, characterized by: One end of the first connecting pipe (203) is located below the partition plate (205), and a plurality of air holes (204) are uniformly arranged on the first connecting pipe (203) and communicated with the first air chamber (206).

4. The cylindrical carbon fiber product forming mold according to claim 1, wherein: The upper mold base (301) comprises an upper mold frame (304), an upper mold top plate (305) and an upper mold bottom plate (306) fixedly connected with the upper mold frame (304), the upper and lower ends of the upper mold sleeve (308) are fixedly connected with the upper mold top plate (305) and the upper mold bottom plate (306) respectively, and the cavity formed between the upper mold frame (304), the upper mold top plate (305), the upper mold bottom plate (306) and the upper mold sleeve (308) forms the second air chamber (307).

5. The cylindrical carbon fiber product forming mold according to claim 1, wherein: A plurality of air vibrators are fixedly installed on the upper mold base (301).

6. The cylindrical carbon fiber product forming mold according to claim 1, wherein: The lifting mechanism (400) comprises a lifting cylinder fixedly installed on the mounting rack (100), a piston rod end of the lifting cylinder is connected with the upper mold assembly (300) through a connecting rack, guide rods are fixedly connected on both sides of the connecting rack, and the guide rods are in sliding fit with guide sleeves arranged on the mounting rack (100).

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