Integrated forming die for composite material annular joint

Abstract

The utility model relates to an integral forming die for a composite material annular joint. The integral forming die comprises a lower die plate, an outer splicing block, an inner splicing block, a lower plug, a core die, an upper plug, a charging connector, an upper die plate and a silica gel air bag, and the lower die plate, the outer splicing block, the inner splicing block, the lower plug, the core die, the upper plug and the upper die plate are positioned and connected through the threaded holes. The integral forming die of the composite material annular joint uses the silica gel air bag to pressurize the interior of the joint, so that a product is integrally formed. The utility model has the following beneficial effects: the product is integrally formed and has high strength; the silica gel air bag can be repeatedly used, production efficiency is high, and time and labor are saved.

Description

Technical Field

[0001] The utility model relates to the field of composite material forming, mainly to composite material products with complex internal profiles and hard mandrels that cannot be removed after curing. It is an integral forming mold for a composite material ring joint that uses an airbag instead of a mandrel to provide internal pressure. Background Art

[0002] Compared with metal materials, composite materials (mainly referring to carbon fiber composite materials) have significant characteristics such as high specific strength, high specific modulus, strong designability, good fatigue resistance, and corrosion resistance, and are widely used in fields such as automobile manufacturing, aerospace, rail transit, and sports equipment. Lightweight is one of the purposes of using composite materials to replace metal materials. Therefore, composite material products often have high strength requirements and need to meet strength indicators with the lightest weight.

[0003] The main method of manufacturing composite material joints in the prior art is to manufacture the joint in two parts, align and bond the two parts after manufacturing, and then perform overall layup and curing. This manufacturing process requires two to three sets of forming molds, which not only have high mold opening costs, complex processes, and long manufacturing cycles, but also have low strength at the bonding part of the product and can only be used in some working conditions with lower mechanical property requirements. Summary of the Invention

[0004] Aiming at the defects in the prior art, the utility model provides an integral forming mold for a composite material ring joint.

[0005] The utility model provides an integral forming mold for a composite material ring joint, which includes a lower template, an outer split block, an inner split block, a lower plug, a mandrel, an upper plug, an inflation nozzle, an upper template, and a silicone airbag.

[0006] A number of threaded holes are provided on the upper and lower surfaces of the outer split block and the inner split block, and a number of through holes are provided at corresponding positions on the lower template and the upper template, and they are tightly connected by screws.

[0007] A threaded hole is provided at the center of the lower plug, and a corresponding through hole is provided on the lower template, and they are tightly connected by screws.

[0008] A threaded hole is provided at the center of the upper plug, and a corresponding through hole is provided on the upper template, and they are tightly connected by screws.

[0009] Threaded holes are provided on the upper and lower surfaces of the mandrel, and corresponding through holes are provided on the upper template and the lower template, and they are tightly connected by screws.

[0010] Slots are provided on the lower plug and the upper plug, the inflation nozzle is fixed in the middle, and two-stage sealing rings are provided at the contact position between the inflation nozzle and the silicone airbag.

[0011] Compared with the prior art, the present invention has the following beneficial effects: The product is integrally formed with high strength; the silicone airbag can be reused, with high production efficiency and time-saving and labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the mold assembly;

[0013] Figure 2 It is a schematic diagram of the silicone airbag. DETAILED DESCRIPTION OF THE INVENTION

[0014] The present invention will be described in detail below in conjunction with specific embodiments.

[0015] Suppose using the utility model patent to manufacture a ring-shaped four-way joint, which includes the following steps:

[0016] 1. Manufacture the silicone airbag (see Figure 2 ): Design and manufacture the silicone airbag according to the inner cavity profile of the product. The forming of the silicone airbag does not require high temperature and high pressure, only the mold needs to provide the profile. Therefore, a low-cost 3D printing process is used to prepare the airbag forming mold. The airbag forming mold can be divided into upper and lower parts. Select silicone with high strength and high viscosity, brush it evenly in the mold cavities of the upper and lower molds of the airbag forming mold after mixing, close the mold, and leave it to cure at room temperature for 24 hours. After curing, take out the silicone airbag and perform post-curing at 130 °C for 3 hours;

[0017] 2. Laying: Install an inflation nozzle at the inflation port of the airbag, slightly inflate the airbag to shape it, and evenly brush the PMR release agent on the airbag. Use carbon fiber epoxy prepreg to perform quasi-isotropic laying on the airbag and the core mold, and the wall thickness of the product is 4 mm;

[0018] 3. Closing the mold: Brush the clean metal outer mold with the PMR release agent 3-5 times, and close the mold after drying. First, place the silicone airbag and the core mold with the product laid on them at the corresponding positions on the lower template, and then fix the outer and inner split blocks on the lower template with screws; after the split blocks are fixed, fix the lower plug and the core mold on the lower template with screws, and place the inflation nozzle in the groove of the lower plug; fix the upper plug on the upper template with screws, close the upper template, and lock it with screws to complete the closing of the mold.

[0019] 4. Curing: Put the mold into the press, heat and pressurize it, and apply positive pressure to the airbag. The temperature of the press is 120 °C, the pressure is 100 bar, the pressure of the airbag is 7 bar, keep warm and pressurize for 3 hours to complete the curing;

[0020] 5. Demolding: Wait for the mold to cool to room temperature, release the pressure and demold. First, disassemble the metal mold and take out the product, and then carefully pull out the airbag from one end of the joint. The product enters the post-treatment process and the production is completed.

[0021] The annular four-way joint manufactured by using the utility model patent can be integrally formed without glued seams, ensuring good strength and improving production efficiency at the same time.

Claims

1. An integrally formed mold for a composite material annular joint, characterized in that, It includes a lower template (100), an outer patch (200), an inner patch (300), a lower plug (400), a core mold (500), an upper plug (600), an inflation nozzle (700), an upper template (800), and a silicone airbag (900). The lower template (100) is connected to the outer patch (200), the inner patch (300), the lower plug (400), and the core mold (500). The outer patch (200), the inner patch (300), the core mold (500), and the upper plug (600) are connected to the upper template (800). The inflation nozzle (700) is connected to the silicone airbag (900). The pre-preg is laid on the outside of the core mold (500) by the silicone airbag (900). The inflation nozzle (700) is fixed between the upper plug (600) and the lower plug (400).

2. The one-piece molding die for a composite material annular joint according to claim 1, characterized in that, A number of threaded holes are provided on the outer patch (200) and the inner patch (300), and a number of through holes are provided on the lower template (100) and the upper template (800), and they are tightly connected by screws.

3. The integrally formed mold for a composite material annular joint according to claim 1, characterized in that, Threaded holes are provided on the lower plug (400), corresponding through holes are provided on the lower template (100), and they are tightly connected by screws; threaded holes are provided on the upper plug (600), corresponding through holes are provided on the upper template (800), and they are tightly connected by screws; threaded holes are provided on the core mold (500), corresponding through holes are provided on the upper template (800) and the lower template (100), and they are tightly connected by screws.

4. The one-piece molding die for a composite material annular joint according to claim 1, characterized in that, The silicone airbag (900) provides pressure for the inner wall of the joint by inflation to shape the inside of the joint.

5. The one-piece molding die for a composite material annular joint according to claim 4, characterized in that, Two-stage sealing rings are provided at the contact position between the inflation nozzle (700) and the silicone airbag (900).

6. The one-piece forming die for a composite material annular joint according to claim 5, characterized in that, Grooves are provided on the lower plug (400) and the upper plug (600) to fix the inflation nozzle (700) in the middle.

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