Missile hood special-shaped heat-proof sleeve resin transfer heating forming mold

Abstract

The utility model relates to a resin transfer heating forming die for an anisotropic heat-proof sleeve of a guided missile hood. The problems that in the prior art, the outer surface of a prefabricated body is wrinkled and layered, and the product thickness is uniform are solved. According to the technical scheme, the die comprises a lower die and an inner die, a bullet-shaped cavity is formed in the lower die, and the two sides of the lower die are open; the structure of the inner die is matched with the bullet-shaped cavity of the lower die, a mounting block is arranged at the upper part of the tail end of the inner die, the lower die head is connected with the upper die head through a bolt, the upper die head is connected with the mounting block, conical grooves are axially formed in the attaching surfaces of the lower die head and the upper die head, the two conical grooves form a cone frustum hole, and the right plug extends into the cone frustum hole; the mold is sealed through a left blanking cap, a glue injection opening is formed in the left blanking cap, a glue outlet is formed in the mounting block, and a mold cavity is formed among the lower mold, the inner mold, the lower mold head, the upper mold head, the left blanking cap and the right blanking cap. The device has the characteristics of simple structure, easiness in operation, high precision, good sealing performance, long service life and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of forming die technical field, specifically to a missile nose fairing special heat shield resin transfer heating forming die. BACKGROUND

[0002] RTM forming process is a closed mold forming technology improved from hand lay-up forming process, and the basic principle is to lay the reinforcing material (such as glass fiber or carbon fiber) into the mold cavity of the closed mold, then inject the resin with low viscosity into the mold cavity through pressure, so that the resin penetrates the reinforcing material, and finally it is cured and formed.

[0003] RTM forming process has the characteristics of high product performance, high production efficiency, environmental and health friendly, mature material technology, and can prepare large and complex components. Since RTM forming process has many advantages, the load-bearing structure on the plane and the heat-resistant layer on the missile are made of composite materials using this process. Later, the demand for high performance, lightweight and low cost of composite materials in the field of aerospace promoted the wider development of RTM forming process in the field of aerospace.

[0004] In the RTM forming process, the design of the mold is related to the surface quality, internal quality and dimensional accuracy of the product, and directly affects the final quality of the product, so the design of the RTM forming mold plays a crucial role in the entire RTM forming process.

[0005] The previous mold design is mostly a structure of combining core and outer mold to form a conical barrel type cavity. When using, the preform is first sleeved on the core mold, and then the outer mold is assembled. Since the preform itself has a certain elasticity, the surface fibers of the preform are often clamped into the joint of the outer mold during assembly of the outer mold, causing wrinkles, delamination and other defects on the outer surface of the preform, which seriously affects the surface quality of the product.

[0006] The structure of combining core and outer mold to form a conical barrel type cavity, the core mold is usually located inside the mold, and the outer mold wall is relatively thin. When curing, the core mold and the outer mold often have a large temperature difference, which can easily cause uneven internal curing and high porosity and other internal quality problems. And the existing mold is prone to break the surface layer fibers of the preform when the simple up-down mold structure is closed during production of the product, and the stress on the annular position of the head of the product is uneven, often causing surface defects. INVENTION CONTENTS

[0007] Therefore, the utility model provides a missile nose fairing special heat shield resin transfer heating forming die to solve the problems of wrinkles, delamination and uniform thickness of the outer surface of the preform in the prior art.

[0008] In order to achieve the above object, the utility model discloses the technical scheme for a missile head cover special heat -proof sleeve resin transfer heating forming die, including lower mould and inner mould, the lower mould inside is bullet head formula cavity, and both sides open;The structure of inner mould is matched with the bullet head formula cavity of lower mould, and is stacked and is set through bolt connection;The upper portion of the tail end of inner mould is provided with the mounting block, the right side of lower mould is provided with lower mould head and upper mould head respectively, upper mould head is connected with mounting block, and lower mould head and upper mould head are spliced together through bolt, and the axial surface of lower mould head and upper mould head is provided with the tapered groove, and two tapered grooves form the circular conical hole, and the right plug is arranged in the circular conical hole, and the right plug is sealed through the right plug, and the right plug is T-shaped column, and the diameter of the end head core mould of the right plug is less than the minimum diameter of the circular conical hole;The left side of lower mould is provided with the left plug cover, and the left plug cover is sealed, and the left plug cover is provided with the glue injection port, and the mounting block is provided with the glue outlet, and the lower mould, the inner mould, the lower mould head, the upper mould head, the left plug cover and the right plug form the mould cavity.

[0009] Further, the inner side of the left plug cover is provided with a closed semicircular sealing strip six, and the two sides and the lower end are also respectively provided with pry openings two, and the glue injection port is arranged in the sealing strip six, and the shape of the closed semicircular sealing strip six is the same as the cross section of the cavity surrounded by the lower mould and the inner mould.

[0010] Further, the two side edges of the inner mould are arranged on the two side edges of the lower mould, and are connected through bolts.

[0011] Further, the upper surfaces of the two sides of the lower mould are respectively provided with sealing grooves one and pry openings one.

[0012] Further, the end face of the upper mould head close to the mounting block is provided with a sealing strip two.

[0013] Further, the end face of the lower mould head close to the lower mould is provided with a sealing strip three, and the upper surface of the lower mould head is also provided with a sealing strip four, and the sealing strip three and the sealing strip four are connected, and the upper surface of the lower mould head is also respectively provided with pry openings three on the two sides.

[0014] Further, the inner wall of the large diameter end of the right plug is provided with an annular sealing strip five.

[0015] Compared with the prior art, the utility model has the following effects:

[0016] 1, the lower mould is female mould, the inner mould is male mould, the lower mould is provided with pry point, and the mould can be quickly removed after curing through the pry point.

[0017] 2, the glue outlet of the utility model is arranged on the mounting block, so that the glue outlet point of the mould cavity is located above the product, avoiding the cavity of the glue outlet position when injecting resin, which causes the local glue deficiency of the product.

[0018] 3、The utility model discloses mould divides into multiple upper and lower moulds instead of single upper and lower moulds, so that the product front end conical ring needs to exert pressure on the prefabricated body around and inside, and the rear end conical semicircle only needs the lower mould and the inner mould to exert pressure.

[0019] 4、The utility model discloses simple structure, easy operation, high precision, good sealing, long service life and the characteristics of long service life.

[0020] 5、The utility model discloses mould wall thickness is same, can make the product when heating solidification, heat more evenly, can improve product quality consistency. DRAWINGS

[0021] Figure 1 It is the structure schematic drawing of the utility model.

[0022] Figure 2 It is the structure schematic drawing of the utility model upper mould.

[0023] Figure 3 It is the structure schematic drawing of the utility model upper die head.

[0024] Figure 4 It is the structure schematic drawing of the utility model lower mould.

[0025] Figure 5 It is the structure schematic drawing of the utility model lower die head.

[0026] Figure 6 It is the structure schematic drawing of the utility model left plug.

[0027] Figure 7 It is the structure schematic drawing of the utility model right plug.

[0028] Marking explanation: 1: lower mould, 2: lower die head, 3: inner mould, 4: upper die head, 5: left plug, 6: right plug, 7: sealing groove one, 8: sealing strip two, 9: sealing strip three, 10: pry mouth one, 11: glue injection port, 12: glue outlet, 13: end head core mould, 14: sealing strip four, 15: sealing strip five, 16: pry mouth two, 17: pry mouth three, 18: sealing strip six, 19: mounting block. DETAILED DESCRIPTION

[0029] In the description of the utility model, it is needful to explain that, unless another explicit provision and limitation, the term " install " " connect " " connect " should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electric connection, can be directly connected, can be two elements inside the intercommunication. For ordinary skilled in the art, the above-mentioned term can be understood in the specific meaning in the utility model through specific circumstances.

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] This utility model mold is a typical mold for composite material missile heat shield products. Because missiles experience extreme ablation environments during high-speed flight due to atmospheric friction, with temperatures reaching up to 1500℃, strict requirements are placed on the surface quality of the product. To ensure the outer surface strength of the product, it must be integrally molded with clean dimensions, prohibiting machining. The high-surface-quality conical-shaped resin transfer heating molding mold, through its special structure and molding method, can manufacture high-quality surface-quality products.

[0032] This embodiment provides a resin transfer heating molding mold for a missile radome, such as... Figures 1-7 As shown, it includes a lower mold 1, a lower mold head 2, an inner mold 3, an upper mold head 4, and a right plug 6, and a mold cavity is formed between the lower mold 1, the inner mold 3, the lower mold head 2, the upper mold head 4, the left plug 5, and the right plug 6.

[0033] like Figure 2 and Figure 4 As shown, the lower mold 1 has a bullet-shaped cavity inside and openings on both sides. The structure of the inner mold 3 is compatible with the bullet-shaped cavity of the lower mold 1. The two sides are stacked on the two sides of the lower mold 1 and connected by bolts. An installation block 19 is provided at the upper part of the tail end of the inner mold 3.

[0034] like Figure 1 , Figure 3 and Figure 5 As shown, the lower mold head 2 and the upper mold head 4 are located on the right side of the lower mold 1. The upper mold head 4 is bolted to the mounting block 19. The lower mold head 2 and the upper mold head 4 are joined together by bolts. The contact surfaces of the lower mold head 2 and the upper mold head 4 are provided with tapered grooves in the axial direction. The two tapered grooves form a truncated cone hole. The truncated cone hole transitions evenly with the bullet-shaped cavity. A right plug 6 is provided in the truncated cone hole. The right plug 6 is a T-shaped column. The diameter of the end core mold 13 of the right plug 6 is smaller than the minimum diameter of the truncated cone hole. A left plug 5 is provided on the left side of the lower mold 1. The left plug 5 is used to seal the hole.

[0035] The left plug 5 is provided with an injection port 11, and the mounting block 19 is provided with an outlet port 12.

[0036] like Figure 4 As shown, the upper surfaces of both sides of the lower mold 1 are respectively provided with sealing grooves 7 and pry holes 10.

[0037] As Figure 3 shown, the upper die head 4 is provided with a sealing strip two 8 on the end face close to the mounting block 19.

[0038] As Figure 5 shown, the lower die head 2 is provided with a sealing strip three 9 on the end face close to the lower die 1, and the upper surface of the lower die head 2 is further provided with a sealing strip four 14, the sealing strip three 9 and the sealing strip four 14 are connected, and the upper surface of the lower die head 2 is further provided with a pry opening three 17 on both sides.

[0039] As Figure 6 shown, the left plug 5 is a 20mm thick flat plate, and a closed semicircular sealing strip six 18 is arranged on the inner side surface of the left plug 5, and pry openings two 16 are further arranged on both sides and the lower end, and the glue injection port 11 is arranged in the sealing strip six 18, and the shape of the closed semicircular sealing strip six 18 is the same as the cross section of the cavity surrounded by the lower die 1 and the inner die 3.

[0040] As Figure 7 shown, the inner wall of the large diameter end of the right plug 6 is provided with an annular sealing strip five 15.

[0041] The utility model uses 45# steel material, and the 45# steel has good comprehensive mechanical properties and relatively low thermal expansion coefficient, so that the mold precision and service life can be met; the length is about 600mm, the width is about 400mm, the height is about 300mm, and the wall thickness of the lower die 1 and the inner die 3 is 20mm.

[0042] The use process of the utility model is as follows:

[0043] φ5.5mm sealing strips are installed in the sealing grooves of the lower die 1, the lower die head 2, the upper die head 4, the left plug 5 and the right plug 6. (Note: the connecting parts of the sealing strips are connected in an inclined angle lap joint mode, and silicon rubber is smeared at the lap joint.)

[0044] First, the fiber preform is placed into the mold cavity of the lower die 1.

[0045] The inner die 3 is installed, and the bolts are locked to fix the position of the preform.

[0046] The lower die head 2 is installed, the head of the fiber preform is lifted by the mold cavity of the lower die head 2, and the lower die 1 and the lower die head 2 are locked by bolts.

[0047] The upper die head 4 is installed, the fiber preform in the head of the mold cavity is compacted, and the bolts are locked.

[0048] (Note: when assembling the mold, the fibers on the outer surface of the fiber preform should not be clamped into the mold gap.)

[0049] The left plug 5 is installed and locked by screws.

[0050] The right plug 6 is installed, the end core die 13 of the right plug 6 is inserted into the end port of the front end of the fiber preform, and the bolt is locked.

[0051] After installation is completed, the resin injection process can be performed through the glue injection port 11 and the glue outlet 12.

[0052] After glue injection, the mold is placed in a curing oven, and curing is performed according to the resin curing system.

[0053] In the above description, many specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, therefore, the protection scope of the present application is not limited by the above disclosed specific embodiments.

[0054] The above is only a preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A resin transfer heating molding die for a missile radome heat shield, characterized in that, The system includes a lower mold (1) and an inner mold (3). The lower mold (1) has a bullet-shaped cavity inside and openings on both sides. The structure of the inner mold (3) matches the bullet-shaped cavity of the lower mold (1) and they are stacked and connected by bolts. An installation block (19) is provided at the upper part of the tail end of the inner mold (3). A lower mold head (2) and an upper mold head (4) are respectively provided on the right side of the lower mold (1). The upper mold head (4) is connected to the installation block (19). The lower mold head (2) and the upper mold head (4) are joined together by bolts. The contact surfaces of the lower mold head (2) and the upper mold head (4) are provided with tapered grooves in the axial direction. The groove forms a truncated cone hole, and a right plug (6) is provided inside the truncated cone hole. The right plug (6) is a T-shaped column. The diameter of the end core mold (13) of the right plug (6) is smaller than the minimum diameter of the truncated cone hole. A left plug (5) is provided on the left side of the lower mold (1). The left plug (5) is used to seal the hole. An injection port (11) is provided on the left plug (5), and an outlet port (12) is provided on the mounting block (19). A mold cavity is formed between the lower mold (1), the inner mold (3), the lower mold head (2), the upper mold head (4), the left plug (5), and the right plug (6).

2. The resin transfer heating molding die for a missile radome anisotropic heat-resistant sleeve according to claim 1, characterized in that, The inner side of the left plug (5) is provided with a closed semi-circular sealing strip six (18), and pry holes two (16) are provided on both sides and the lower end respectively. The glue injection port (11) is located inside the sealing strip six (18). The shape of the closed semi-circular sealing strip six (18) is the same as the cross section of the cavity formed by the lower mold (1) and the inner mold (3).

3. A resin transfer heating molding die for a missile radome anisotropic heat-resistant sleeve according to claim 1 or 2, characterized in that, The two sides of the inner mold (3) are laid on the two sides of the lower mold (1) and connected by bolts.

4. The resin transfer heating molding die for a missile radome anisotropic heat-resistant sleeve according to claim 3, characterized in that, The upper surfaces of both sides of the lower mold (1) are respectively provided with a sealing groove (7) and a pry opening (10).

5. The resin transfer heating molding die for a missile radome anisotropic heat-resistant sleeve according to claim 4, characterized in that, A sealing strip (8) is provided on the end face of the upper mold head (4) near the mounting block (19).

6. The resin transfer heating molding die for a missile radome anisotropic heat-resistant sleeve according to claim 5, characterized in that, The lower die head (2) is provided with a sealing strip three (9) on the end face near the lower die (1), and a sealing strip four (14) is also provided on the upper surface of the lower die head (2). The sealing strip three (9) and the sealing strip four (14) are connected, and pry holes three (17) are provided on both sides of the upper surface of the lower die head (2).

7. The resin transfer heating molding die for a missile radome anisotropic heat-resistant sleeve according to claim 6, characterized in that, The inner wall of the large-diameter end of the right plug (6) is provided with an annular sealing strip five (15).

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