Barrel-shaped RTM (resin transfer molding) resin transfer heating forming mold

Abstract

The utility model relates to a barrel-shaped RTM (Resin Transfer Molding) resin transfer heating forming mold. An existing mold causes incomplete resin infiltration of a prefabricated body, long mold filling time, high error probability and influence on product quality. According to the scheme, the die comprises a core die and an outer die, the core die is sleeved with the outer die, and the upper portion of the small-diameter end and the upper portion of the large-diameter end of the core die are each provided with a first sealing groove; the outer die is in a ring shape defined by four arc-shaped pieces, the two side edges of each arc-shaped piece are turned outwards, threaded holes are formed in the turned edges, and every two adjacent arc-shaped pieces are connected through bolts. A step is arranged on the lower side of the inner wall of each arc-shaped piece in an inwards-concave mode and erected on the limiting step of the core mold, a boss is arranged on the upper side of the inner wall outwards, and a sealed barrel-shaped mold cavity is formed after the core mold and the outer mold are combined. Glue injection openings are formed in the two opposite arc-shaped pieces, and glue outlets are formed in the other two opposite arc-shaped pieces. 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 the technical field of RTM resin molding dies, in particular to a barrel-shaped RTM resin transfer heating molding die. Technical Background

[0002] 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 solidify and form.

[0003] The RTM molding process has the characteristics of high product performance, great cost and efficiency advantages, environmental and health friendliness, mature material technology, and the ability to prepare large and complex components. It is mostly used to manufacture parts for satellites and missiles. Its application in the aerospace field has an important technical background and broad prospects.

[0004] In the RTM molding process, the quality 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] This mold is a molding mold for the heat shield of hypersonic weapons in the aerospace field. Due to the special use scenarios of the product and the high cost of raw materials, there are extremely high requirements for product quality and yield rate. The outer mold of existing barrel-shaped RTM molds is mostly designed in two halves. Although this design saves the labor time of assembling the mold, the preform is easily unevenly compressed during mold installation, resulting in wrinkles, which affects product quality. In addition, the injection and discharge ports of the RTM mold are mostly arranged horizontally and vertically. This arrangement makes it easy for the resin to take shortcuts when injecting resin, similar to a short circuit phenomenon, resulting in incomplete resin infiltration of the preform, affecting product quality. In order to ensure the accuracy of the mold cavity, previous RTM molds would also design a large number of positioning parts, which greatly increased the labor time of mold installation and the probability of operational errors. Utility Model Content

[0006] In view of this, the utility model provides a barrel-shaped RTM resin transfer heating molding mold.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a barrel-shaped RTM resin transfer heating molding mold, comprising a core mold and an annular outer mold, the core mold is sleeved in the annular outer mold, the core mold is a T-shaped column, and the upper part of the small diameter end and the upper part of the large diameter end of the T-shaped columnar core mold are respectively provided with a sealing groove; the outer mold is surrounded by 4 arc-shaped pieces in a ring, and the two side edges of each arc-shaped piece are respectively flanged outward, and a threaded hole is provided on the flange, and two adjacent arc-shaped pieces are connected by bolts; a step is provided on the lower side of the inner wall of each arc-shaped piece, and the step is built on the limiting step of the core mold, and a boss is provided outward on the upper side of the inner wall. The core mold and the outer mold are combined to form a sealed barrel-shaped mold cavity; a glue injection port is provided on the two opposite arc-shaped pieces, and a glue outlet is provided on the other two opposite arc-shaped pieces.

[0008] Furthermore, the glue injection port is arranged at the lower end of the arc-shaped piece and is symmetrically staggered on the left and right, and the glue outlet is arranged at the upper end of the arc-shaped piece and is symmetrically staggered on the left and right.

[0009] Furthermore, sealing grooves 2 are provided on the flanges on both sides of each arc-shaped piece.

[0010] Furthermore, the top of the core mold is symmetrically provided with hanging ring holes.

[0011] Furthermore, the sealing groove 1 is annular, with a width of 5 mm and a depth of 3 mm.

[0012] Furthermore, the mold height is 450 mm-550 mm, the diameter is 350 mm-450 mm, and the material is 45# steel.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] 1) The core mold and outer mold of the utility model are both provided with limiting steps, which simplifies the mold structure, eliminates small parts such as positioning pins in the thickness direction of the mold cavity, and reduces the risk of operational errors.

[0015] 2) The outer mold of the utility model is surrounded by a circular ring with four arc-shaped pieces. Since the preform needs to be put on the core mold in advance when the mold is used, the preform is elastic and its thickness is usually greater than the thickness of the mold cavity. The preform needs to be compacted by the outer mold. Therefore, the outer mold of the utility model is surrounded by a circular ring with four arc-shaped pieces. The four arc-shaped pieces can make the preform compacted more evenly and reduce the generation of wrinkles.

[0016] 3) The utility model has the characteristics of simple structure, easy operation, high precision, good sealing and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an exploded view of the present invention.

[0018] Figure 2 Schematic diagram of the structure of the core mold.

[0019] Figure 3 A side view of any outer mold.

[0020] Figure 4 It is a structural diagram of the outer mold assembly.

[0021] Figure 5 It is a structural diagram of the present utility model.

[0022] Marking instructions: 1. Outer mold 1; 2. Outer mold 2; 3. Outer mold 3; 4. Outer mold 4; 5. Core mold; 6. Limit step; 7. Eyelet hole; 8. Sealing groove 1; 9. Threaded connection port; 10.

[0023] Positioning pin hole; 11. Limiting step at the lower end of the outer mold; 12. Boss; 13. Connecting surface of the outer mold; 14. Glue outlet; 15. Glue injection port; 16. Second sealing groove. DETAILED DESCRIPTION

[0024] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will 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 barrel-type RTM resin transfer heating molding mold, such as Figure 1-Figure 5 As shown, it includes a core mold 5 and an annular outer mold. The core mold 5 is clamped in the annular outer mold by the outer mold lower end limiting step 11 and the upper end boss 12. The mold height is 500mm and the diameter is 400mm. The material is 45# steel. 45# steel has good comprehensive mechanical properties and can improve the mold precision and service life.

[0027] As an implementation method in this embodiment, the core mold 5 is a T-shaped column. The upper part of the small diameter end and the upper part of the large diameter end of the T-shaped column core mold 5 are respectively provided with an annular sealing groove 8 with a width of 5 mm and a depth of 3 mm. A sealing strip is provided in the sealing groove 8 to ensure the sealing of the mold; a limiting step 6 is provided at the lower end of the core mold 5 to ensure the thickness of the product in the lower half of the mold cavity. Two lifting ring holes 7 are symmetrically provided on the top of the core mold 5 for installing lifting rings, such as Figure 2 shown.

[0028] The lower ends of the outer mold 1 and the outer mold 3 are respectively provided with a glue injection port 15, and the upper ends of the outer mold 2 and the outer mold 4 are respectively provided with a glue outlet 14. The two glue injection ports are designed at the lower ends of the outer mold 1 and the outer mold 3, and the two glue outlets are designed at the upper ends of the outer mold 2 and the outer mold 4, and are symmetrically staggered on the left and right. This design allows the resin to more evenly and fully infiltrate the fiber preform during glue injection, effectively reducing the generation of pores inside the product and improving product performance, surface and internal quality.

[0029] As an implementation method in this embodiment, the outer mold is surrounded by 4 arc-shaped pieces in a ring shape, and the two side edges of each arc-shaped piece are respectively flanged outwards, and a threaded connection port 9 and a positioning pin hole 10 are provided on the flanged outer mold docking surface 13, which are used to position and tighten the outer mold and improve the strength of the outer mold. The two adjacent arc-shaped pieces are connected by bolts; a sealing groove 2 16 is also provided at the flanges on both sides of each arc-shaped piece, and sealing is achieved by the sealing strip in the sealing groove 2 16. A step is provided on the lower side of the inner wall of each arc-shaped piece, and the step is built on the limiting step 6 of the core mold 5. A boss 12 is provided on the upper side of the inner wall. After the core mold 5 and the outer mold are combined, a sealed barrel-shaped mold cavity is formed; the boss 12 is clamped on the upper part of the core mold to ensure the thickness of the product, such as Figure 1 、 Figure 3 and Figure 4 shown.

[0030] Working method of the utility model:

[0031] 1) When using the mold, first install a 5.5mm sealing strip in the sealing groove of the core mold and the outer mold (note: the sealing strip connection is connected by an angled overlap method, and silicone rubber is applied at the overlap), spray a release agent or stick Teflon on the working surface of the core mold and the outer mold to facilitate demolding after the product is formed.

[0032] 2) Place the fiber preform on the core mold. (Note: Due to the low strength of the fiber preform, it is prohibited to place it violently to avoid damaging the fiber preform.)

[0033] 3) When installing the outer mold, align the lower limit step of the outer mold with the lower step of the core mold, and install outer mold one, outer mold two, outer mold three and outer mold four in sequence. (Pay attention to the corresponding positions of the four outer molds, and do not need to consider the corresponding positions between the mold core and the four outer molds.) Install the positioning pins and tighten the bolts.

[0034] 4) After the installation is completed, the glue injection process can be carried out through the glue injection port and glue outlet.

[0035] 5) After the product is formed, remove the outer molds one by one, rotate it on the core mold and pull the product upwards to easily demould.

[0036] 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.

[0037] 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 barrel-shaped RTM resin transfer heating molding mold, characterized in that: The invention comprises a core mold (5) and an annular outer mold, wherein the core mold (5) is sleeved in the annular outer mold, the core mold is a T-shaped column, and the upper part of the small diameter end and the upper part of the large diameter end of the T-shaped columnar core mold are respectively provided with a sealing groove (8); the outer mold is surrounded by four arc-shaped pieces to form a ring, and the two sides of each arc-shaped piece are respectively turned outward, and the turned edges are provided with threaded holes, and two adjacent arc-shaped pieces are connected by bolts; the lower side of the inner wall of each arc-shaped piece is concavely provided with a step, and the step is built on the limiting step (6) of the core mold (5), and the upper side of the inner wall is provided with a boss (12) facing outward, and the core mold (5) and the outer mold are combined to form a sealed barrel-shaped mold cavity; two opposite arc-shaped pieces are provided with a glue injection port (15), and two other opposite arc-shaped pieces are provided with a glue outlet (14).

2. The barrel-shaped RTM resin transfer heating molding mold according to claim 1, characterized in that: The glue injection port (15) is arranged at the lower end of the arc-shaped piece and is symmetrically staggered on the left and right. The glue outlet (14) is arranged at the upper end of the arc-shaped piece and is symmetrically staggered on the left and right.

3. A barrel-shaped RTM resin transfer heating molding die according to claim 1 or 2, characterized in that: Each arc-shaped piece is also provided with two sealing grooves (16) at the flanges on both sides.

4. The barrel-shaped RTM resin transfer heating molding die according to claim 3, characterized in that: The top of the core mold (5) is symmetrically provided with hanging ring holes (7).

5. The barrel-shaped RTM resin transfer heating molding die according to claim 4, characterized in that: The sealing groove 1 (8) is annular, with a width of 5 mm and a depth of 3 mm.

6. The barrel-shaped RTM resin transfer heating molding die according to claim 5, characterized in that: The mold has a height of 450 mm-550 mm, a diameter of 350 mm-450 mm, and is made of 45# steel.

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