Conical barrel type rapid heating and cooling resin transfer heating forming mold

Abstract

The utility model relates to a conical barrel type rapid heating and cooling resin transfer heating forming mold. The temperature difference between inner and outer surfaces of a product is large and the product quality is severely influenced due to slow heating and cooling speed in the prior art. The die comprises a core die and an outer die, a base and an upper cover are arranged at the upper end and the lower end of the outer die respectively, the core die is arranged in the outer die in a sleeved mode, the core die is a big-end-down cylindrical body, and a circle of lower limiting step is arranged at the bottom of the core die. The outer mold is a circular ring formed by three arc-shaped sheets, the two side edges and the upper and lower edges of each arc-shaped sheet are respectively turned outwards, threaded connecting holes are respectively formed in the outer turned edges of the two side edges and the upper and lower edges, connecting lugs are respectively and integrally formed on the inner sides of the upper and lower turned edges of one arc-shaped sheet, and a glue outlet hole and a glue injection port are respectively formed in the connecting lugs; a circle of upper limiting step is arranged at the upper part of the inner wall of the outer mold. The utility model has the characteristics of quick heating and cooling, uniform temperature on the inner and outer surfaces of the product, simple structure, easy operation, high precision, long service life and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of forming molds, in particular to a cone barrel type rapid temperature rise and fall resin transfer heating forming mold. Technical Background

[0002] Rapid heating and cooling resin transfer molding dies are used for forming heat shields for hypersonic weapon compartments in the aviation industry. These heat shields are composed of a composite of a quartz fiber preform and phenolic resin. During service, the surface temperature of these heat shields can reach 1300°C, requiring them to meet the thermal insulation and dimensional requirements of their exterior surfaces in extreme environments. Because these products are used in aviation, any quality issues during use can have serious consequences. The product's unique application scenario and high raw material costs place extremely high demands on product quality and yield, placing high demands on the molding die. In particular, the mold heating rate and temperature uniformity are crucial.

[0003] The RTM molding process is a closed mold molding technology improved from the hand lay-up molding process. The basic principle is to lay the reinforcing material (such as glass fiber or carbon fiber) into the closed mold cavity, and then inject low-viscosity resin into the mold cavity under pressure to allow the resin to penetrate the reinforcing material, and finally heat and cure it into shape.

[0004] In the RTM molding process, the design of the mold is related to the surface quality, internal quality, dimensional accuracy, etc. of the product, which directly affects the final quality of the product. Therefore, the design of the RTM molding mold plays a vital role in the entire RTM molding process.

[0005] Since the product ultimately needs to be heated and cured, the mold needs to have high dimensional accuracy and sealing as well as good thermal conductivity.

[0006] In the past, mold designs mostly used a conical barrel-shaped mold cavity structure formed by integrating the mold core and the outer mold. Since the mold core itself is located inside and is solid, and the wall thickness of the outer mold is relatively thin, and since the mold is often a steel mold and the mold core is solid, the heating and cooling speeds are very slow. There will be a large temperature difference between the inside of the mold core and the outer mold, resulting in a large temperature difference between the inner and outer surfaces of the product, which seriously affects product quality and increases manufacturing costs. Utility Model Content

[0007] In view of this, the utility model provides a conical barrel-shaped rapid heating and cooling resin transfer heating molding mold, which can achieve rapid heating and cooling, and the temperature of the inner and outer surfaces of the product is uniform. At the same time, it also has the characteristics of simple structure, easy operation, high precision, good sealing, and long service life.

[0008] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a conical barrel-shaped rapid heating and cooling resin transfer heating molding mold, characterized in that it includes a core mold and an outer mold, the upper and lower ends of the outer mold are respectively provided with a base and an upper cover, the core mold is sleeved in the outer mold, the core mold is a cylindrical body with a small upper part and a large lower part, and a circle of lower limit steps is provided at the bottom; the outer mold is composed of 3 arc-shaped pieces to form a circular ring, and the two side edges and upper and lower edges of each arc-shaped piece are respectively turned outward, and the two side edges and upper and lower edges are respectively provided with threaded connecting holes, and the inner sides of the upper and lower flanges of one of the arc-shaped pieces are respectively integrally formed with connecting ears, and the connecting ears are respectively provided with a glue outlet hole and a glue injection port, and the upper part of the inner wall of the outer mold is provided with a circle of upper limit steps, and the wall thickness of the core mold and the outer mold is the same.

[0009] Furthermore, a sealing groove is provided on the upper and lower end surfaces of the core mold respectively.

[0010] Furthermore, an annular sealing groove 2 is provided on the upper surface of the base, and a prying groove is also provided on the circumference.

[0011] Furthermore, the base and the upper cover are connected to the core mold and the outer mold through bolts.

[0012] Furthermore, the glue outlet is arranged on the upper connecting ear, and the glue injection port is arranged on the lower connecting ear.

[0013] Furthermore, two sealing grooves are provided inside and outside the second sealing groove.

[0014] Compared with the prior art, the advantages of this utility model are:

[0015] 1) The core mold of the utility model is set as a cylindrical body with a small top and a large bottom, so that the heat flow can enter the core mold through the upper and lower surfaces of the mold, realizing rapid heating and cooling. The wall thickness of the core mold is the same as that of the outer mold, which can basically achieve uniform temperature on the inner and outer surfaces of the product.

[0016] 2) The upper ends of the three outer molds of the utility model are provided with upper limit steps to ensure the thickness of the product.

[0017] 3) The outer mold of the utility model is provided with flanges around it to strengthen the strength of the outer mold, prevent the mold from deformation and increase the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the present utility model.

[0019] Figure 2 It is a structural schematic diagram of the upper cover of the utility model.

[0020] Figure 3 It is a structural diagram of the base of the utility model.

[0021] Figure 4 It is a structural diagram of the core mold of the utility model.

[0022] Figure 5 It is a structural diagram of the outer mold of the utility model.

[0023] Marking instructions: 1. Core mold; 2. Outer mold; 3. Base; 4. Upper cover; 5. Sealing groove 1; 6. Threaded connection hole; 7. Prying groove; 8. Locating pin hole; 9. Upper limit step; 10. Glue outlet hole; 11. Glue injection port; 12. Lower limit step; 13. Sealing groove 2. DETAILED DESCRIPTION

[0024] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] This embodiment provides a cone barrel type rapid temperature rise and fall resin transfer heating molding die, such as Figure 1-Figure 5 As shown, it includes a core mold 1 and an outer mold 2. The core mold 1 is sleeved in the outer mold 2. The upper and lower ends of the outer mold 2 are respectively provided with a base 3 and an upper cover 4. The base 3 and the upper cover 4 are respectively provided with threaded connection holes. The core mold 1 and the outer mold 2 are connected to the base 3 and the upper cover 4 by bolts.

[0027] As an implementation method in this embodiment, the core mold 1 is a cylindrical body with a small top and a large bottom, with a wall thickness of 40mm. A circle of lower limit steps 12 is provided at the bottom to ensure the thickness of the product in the lower half of the mold cavity. A circle of sealing grooves 5 with a width of 5mm and a depth of 3mm are respectively provided on the upper and lower end surfaces for installing sealing strips to ensure the sealing of the mold. The cylindrical body with a small top and a large bottom can allow heat flow to enter the core through the upper and lower surfaces of the mold to achieve rapid heating and cooling. The wall thickness of the core mold is the same as that of the outer mold, so that the temperature of the inner and outer surfaces of the product is uniform. Figure 4 shown.

[0028] As an implementation method in this embodiment, the outer mold 2 is composed of three arc-shaped pieces forming a circular ring. The two side edges and the upper and lower edges of each arc-shaped piece are respectively turned outward, and the two side edges and the upper and lower edges are respectively provided with threaded connection holes. The inner sides of the upper and lower flanges of one of the arc-shaped pieces are respectively integrally formed with connecting ears, and the connecting ears are respectively provided with a glue outlet hole 10 and a glue injection port 11. The glue outlet hole 10 is set on the upper connecting ear, and the glue injection port 11 is set on the lower connecting ear. An upper limit step 9 is provided on the upper part of the inner wall of the outer mold to ensure the thickness of the product. The outer mold is provided with flanges around to strengthen the strength of the outer mold, prevent the mold from deformation, and increase the service life; the left and right flanges are provided with threaded connection holes 6, positioning pin holes 8 and sealing grooves with a width of 5mm and a depth of 3mm, which are used to install sealing strips, positioning pins and fasten the outer mold, such as Figure 5 shown.

[0029] As an implementation method in this embodiment, the upper surface of the base 3 is provided with two annular sealing grooves 13 for installing sealing strips to ensure sealing. The two annular sealing grooves 13 are provided inside and outside, and the width of the sealing grooves 13 is 5mm and the depth is 3mm. The circumference of the base 3 is also provided with a prying groove 7 for prying the outer mold when removing the mold. Figure 4 shown.

[0030] As an implementation method in this embodiment, the base and upper cover of the mold are ring-shaped, ensuring that the heat flow can enter the mold core during heating.

[0031] As an implementation method in this embodiment, the core mold 1 and the outer mold 2 have the same height, and the mold cavity is formed by the upper limit step 9 of the outer mold and the lower limit step 12 of the core mold 1.

[0032] As an implementation method in this embodiment, the mold of the utility model has a height of 700 mm and a diameter of 600 mm. The mold material is 6061 aluminum alloy, which has good comprehensive mechanical properties and high thermal conductivity, and can meet the mold precision and service life.

[0033] Working method of the utility model:

[0034] When using the mold, first install 5.5mm sealing strips on the mold base, core mold and outer mold sealing grooves (Note: The sealing strips are connected at an angled overlap and silicone rubber is applied at the overlap.

[0035] Align the core mold with the threaded connection hole and install it on the base, and then tighten it with bolts.

[0036] Spray release agent or stick Teflon on the working surface of the core mold and outer mold to facilitate demolding after product molding.

[0037] Put the fiber preform on the core mold. (Note: Due to the low strength of the fiber preform, it is forbidden to put it on violently to avoid damaging the fiber preform.

[0038] Install the outer mold, align the lower end of the outer mold with the lower step of the core mold, install the outer mold, install the positioning pin, and tighten the bolts.

[0039] Align the threaded connection holes of the upper cover and the core mold, install the upper cover and tighten it with bolts.

[0040] After the installation is completed, the resin injection process can be carried out through the injection port and the discharge port.

[0041] After injection of glue, place the mold in a curing oven and cure it according to the resin curing system.

[0042] After curing, insert the crowbar into the pry point on the mold base to pry the outer mold, remove the outer mold one by one, rotate it on the core mold and pull the product upwards to easily demould.

[0043] Many specific details are set forth in the above description to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed above.

[0044] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A cone barrel type rapid temperature rise and fall resin transfer heating molding die, characterized in that , comprising a core mold (1) and an outer mold (2), the upper and lower ends of the outer mold (2) are respectively provided with a base (3) and an upper cover (4), the core mold (1) is sleeved in the outer mold (2), the core mold (1) is a cylindrical body with a small upper part and a large lower part, and a circle of lower limit steps (12) is provided at the bottom; the outer mold (2) is composed of three arc-shaped pieces to form a ring, the two side edges and the upper and lower edges of each arc-shaped piece are respectively turned outward, and the two side edges and the upper and lower edges are respectively provided with threaded connection holes, the inner side of the upper and lower edges of one of the arc-shaped pieces are respectively integrally formed with connecting ears, and the connecting ears are respectively provided with a glue outlet hole (10) and a glue injection port (11), and a circle of upper limit steps (9) is provided on the upper part of the inner wall of the outer mold (2), and the wall thickness of the core mold (1) and the outer mold (2) is the same.

2. A cone barrel type rapid temperature rise and fall resin transfer heating molding die according to claim 1, characterized in that The upper and lower end surfaces of the core mold (1) are respectively provided with a circle of sealing grooves (5).

3. A cone barrel type rapid temperature rise and fall resin transfer heating molding die according to claim 1 or 2, characterized in that The upper surface of the base (3) is provided with an annular sealing groove 2 (13), and a prying groove (7) is also provided on the circumference.

4. A cone barrel type rapid temperature rise and fall resin transfer heating molding die according to claim 3, characterized in that The base (3) and the upper cover (4) are connected to the core mold (1) and the outer mold (2) through bolts.

5. A cone barrel type rapid temperature rise and fall resin transfer heating molding die according to claim 4, characterized in that The glue outlet hole (10) is arranged on the upper connecting ear, and the glue injection port (11) is arranged on the lower connecting ear.

6. A cone barrel type rapid temperature rise and fall resin transfer heating molding die according to claim 5, characterized in that , there are two sealing grooves (13) provided inside and outside.

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