Composite material forming mold based on RTM (Resin Transfer Molding) process

Abstract

The utility model relates to the technical field of composite material forming, and discloses a composite material forming mold based on an RTM (Resin Transfer Molding) process, which comprises an upper mold, a lower mold and a locking assembly, the upper die and the lower die are closed to form a cavity, the locking assembly is located at the bottom of the lower die, positioning pieces are arranged at the four corners of the bottom of the upper die, annular grooves are formed in the middles of the positioning pieces, threaded parts in threaded connection with the upper die are fixed to the upper ends of the positioning pieces, and chamfering parts are fixedly installed at the lower ends of the positioning pieces. Positioning holes matched with the positioning pieces are formed in the lower die; guide rails are fixedly mounted on two sides of the bottom of the lower die; the locking assembly comprises a sliding piece which can be matched with the annular groove in a clamped mode and slide along the guide rail, a two-way screw rod in threaded connection with the sliding piece, and a motor driving the two-way screw rod to rotate. According to the device, stable locking of the mold is achieved through cooperation of the positioning piece and the locking assembly, deformation and damage easily caused when a traditional locking structure is used for locking the edge of the mold are avoided, and the uniformity of resin injection in the RTM technology and the stability of the curing process are ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to composite material forming technical field, concretely is a kind of composite material forming mould based on RTM process. BACKGROUND

[0002] In the field of composite material manufacturing, RTM (resin transfer molding) process occupies an important position in the field of aerospace, military manufacturing and other precision instrument parts manufacturing due to its advantages of high efficiency, low cost and ability to produce high-quality composite materials. The core step of this process is to inject resin into a pre-designed mold cavity and form the final composite product after curing.

[0003] However, in practical applications, the traditional mold of RTM process is usually fixed by hydraulic pressure, and safety locking structures such as bolt riveting, cam locking structure, etc. are supplemented at the edge of the upper and lower molds. These locking structures are mostly set at the edge area of the upper and lower molds, and these locking structures are prone to deformation and damage in the long-term high-pressure and frequent use of RTM process. This deformation and damage not only destroys the close fit between the upper and lower molds, but also leads to a decrease in mold sealing performance.

[0004] The lack of mold sealing will directly affect the RTM process, including the uniformity of resin injection, the stability of the curing process, etc., thereby causing a series of problems such as product quality failure. In view of these challenges, the industry urgently needs a composite material forming mold based on RTM process to solve the problems of deformation, damage and lack of sealing that occur in traditional molds under long-term use and high-pressure environment. INVENTION CONTENTS

[0005] (I) Technical problem solved

[0006] To solve the problems of the prior art, the utility model provides a composite material forming mold based on RTM process, which has an innovative locking mechanism, effectively ensures the stability of the mold edge, improves the overall performance of the mold, etc. The problem of deformation, damage and lack of sealing that occurs in the edge connection of traditional molds under long-term use and high-pressure environment is solved.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned innovative locking mechanism, effectively ensure the stability of the mold edge, and improve the overall performance of the mold, the utility model provides the following technical solutions:

[0009] The utility model provides a kind of composite material forming mould based on RTM process, including upper mould, lower mould and locking assembly, the upper mould and lower mould form cavity after moulding, the locking assembly is located lower mould bottom, and the upper mould bottom four corners are provided with positioning piece;

[0010] Annular groove is arranged in the middle of the positioning piece, the upper end of the positioning piece is fixed with the threaded portion which is threadedly connected with the bottom of the upper mould, and the lower end of the positioning piece is fixedly installed with the chamfer portion;

[0011] The lower mould is provided with positioning holes matched with the positioning piece, and guide rails are fixedly installed on both sides of the lower mould bottom.

[0012] The locking assembly comprises two sliding members capable of being clamped and matched with the annular groove and sliding along the guide rails, a bidirectional screw rod threadedly connected with the two sliding members, and a motor for driving the bidirectional screw rod to rotate.

[0013] The utility model provides preferably technical scheme is at, the upper mould bottom is equipped with annular air-tight ring, the lower mould upper surface is equipped with air-tight groove of interference fit with air-tight ring, and the air-tight ring thickness is greater than air-tight groove depth 1-2mm.

[0014] The utility model provides preferably technical scheme is at, and the lower mould both sides in the axial direction of bidirectional screw rod are fixedly installed with end block, and the one end of bidirectional screw rod is rotatably connected with end block, and the other end is fixedly installed with the output end of motor and penetrates end block.

[0015] The utility model provides preferably technical scheme is at, and the chamfer portion is in the circular truncated cone structure of big down small, and its taper angle is 30°-45°.

[0016] The utility model provides preferably technical scheme is at, and the sliding member includes locking plate, and the opposite ends of two locking plates are provided with clamping sliding groove which is slidably clamped with the annular groove of the sliding member on the same side.

[0017] The utility model provides preferably technical scheme is at, and the mouth of clamping sliding groove is equipped with guide flared mouth, and the bottom of locking plate is provided with guide inclined surface matched with the movement track of positioning piece on the side close to positioning piece.

[0018] The utility model provides preferably technical scheme is at, and the bottom of two locking plates is installed with fixed block which is threadedly connected with bidirectional screw rod, and the thread connection direction of two fixed blocks and bidirectional screw rod is opposite.

[0019] (Three) beneficial effects

[0020] Compared with the prior art, the utility model provides a kind of composite material forming mould based on RTM process, with the following beneficial effects:

[0021] The composite material forming die based on the RTM process realizes stable locking of the die through the cooperation and clamping of the positioning piece and the locking assembly, specifically, the sliding piece in the locking assembly can slide along the guide rail and is clamped and cooperated with the annular groove of the positioning piece at the bottom of the upper die, through the driving of the bidirectional screw rod and the motor, quick and stable locking is realized, the locking assembly is directly cooperated with the positioning piece, the deformation and damage of the edge of the die under long-term use and high-pressure environment are effectively avoided when the traditional locking structure is locked at the edge of the die, the die is not only prevented from deforming but also has the function of quick locking, and the uniformity of resin injection and the stability of the curing process in the RTM process are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure schematic view when the upper die and the lower die of the utility model are separated;

[0023] Figure 2 It is a whole structure top view of the utility model;

[0024] Figure 3 It is an explosion view of the structure of the upper die and the positioning piece in the utility model;

[0025] Figure 4 It is a whole structure side view of the utility model;

[0026] Figure 5 It is a top structure schematic view of the locking plate in the utility model;

[0027] Figure 6 It is a bottom structure schematic view of the locking plate in the utility model.

[0028] In the drawing: 1, upper die;11, air-tight ring;2, lower die;21, positioning hole;22, air-tight groove;23, guide rail;3, cavity;4, positioning piece;41, chamfer part;42, annular groove;43, threaded part;5, end block;6, locking assembly;61, sliding piece;6101, locking plate;6102, clamping sliding groove;6103, guide flared portion;6104, guide inclined surface;6105, fixed block;62, bidirectional screw rod;63, motor. DETAILED DESCRIPTION

[0029] The technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0030] In the description of the utility model, it is necessary to understand that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model.

[0031] In the description of the utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] Please refer to Figures 1-6 A composite material forming die based on RTM process, comprising an upper die 1, a lower die 2 and a locking assembly 6, the upper die 1 and the lower die 2 form a cavity 3 after clamping, the locking assembly 6 is located at the bottom of the lower die 2, and the upper die 1 is provided with a positioning piece 4 at the four corners of the bottom;

[0033] An annular groove 42 is formed in the middle of the positioning piece 4, and a threaded portion 43 is fixed on the upper end of the positioning piece 4 and is screwed with the bottom of the upper die 1, the threaded portion 43 provided on the upper end of the positioning piece 4 is screwed with the upper die 1, which is convenient for replacing the positioning piece 4 when it is deformed and insufficient in strength, and will not cause the sealing effect of the die to be poor due to edge deformation, thereby causing the whole die to be scrapped, which saves cost, and the lower end of the positioning piece 4 is fixedly installed with a chamfer portion 41;

[0034] A positioning hole 21 matched with the positioning piece 4 is formed on the lower die 2, and guide rails 23 are fixedly installed on both sides of the bottom of the lower die 2;

[0035] The locking assembly 6 comprises two sliding pieces 61 capable of being clamped with the annular groove 42 and sliding along the guide rails 23, a bidirectional screw rod 62 screwed with the two sliding pieces 61, and a motor 63 for driving the bidirectional screw rod 62 to rotate.

[0036] It should be noted that the cavity 3 formed after the upper die 1 and the lower die 2 are clamped is the key area of resin injection and curing in the RTM process. The design of the positioning piece 4 not only ensures the accurate alignment of the upper die 1 and the lower die 2, but also realizes the stable locking of the die in the high-pressure environment through cooperation with the locking assembly 6. The annular groove 42 provides a clamping point for the sliding piece 61, making the locking process more reliable.

[0037] In this embodiment, the upper die 1 is provided with an annular air-tight ring 11 at the bottom, and the lower die 2 is provided with an air-tight groove 22 on the upper surface which fits with the air-tight ring 11. The thickness of the air-tight ring 11 is 1-2mm greater than the depth of the air-tight groove 22.

[0038] It should be noted that the interference fit between the annular air-tight ring 11 and the air-tight groove 22 is a key measure to enhance the sealing performance of the mold. This design ensures that the resin does not leak during the injection process, thereby ensuring the stability of the RTM process and the quality of the composite material product. The design of the air-tight ring 11 thickness being greater than the depth of the air-tight groove 22 not only ensures the sealing performance, but also leaves a certain elastic space to accommodate the slight deformation of the mold during the clamping process.

[0039] In this embodiment, end blocks 5 are fixedly installed on both sides of the lower die 2 in the axial direction of the bidirectional screw 62. One end of the bidirectional screw 62 is rotationally connected with the end block 5, and the other end penetrates through the end block 5 and is fixedly installed with the output end of the motor 63.

[0040] It should be noted that the combined driving mode of the bidirectional screw 62 and the motor 63 realizes the fast response and precise control of the locking assembly 6. By adjusting the speed and direction of the motor 63, the locking and unlocking of the sliding member 61 can be easily realized, thereby improving the operation convenience and production efficiency of the mold.

[0041] In this embodiment, the chamfered portion 41 is in the shape of a circular truncated cone with the upper part larger and the lower part smaller, and the taper angle is 30°-45°.

[0042] It should be noted that the circular truncated cone structure design of the chamfered portion 41 reduces the friction and resistance during the positioning of the upper die 1 and the lower die 2, and at the same time prolongs the service life of the mold.

[0043] In some embodiments, the sliding member 61 includes locking plates 6101, and the opposite ends of the two locking plates 6101 are provided with clamping sliding grooves 6102 which are slidably connected with the annular grooves 42 of the same side sliding member 61. The slot of the clamping sliding groove 6102 is provided with a guide flared portion 6103, and the bottom of the locking plate 6101 is provided with a guide inclined surface 6104 which matches the movement trajectory of the positioning member 4.

[0044] It should be noted that the design of the clamping sliding groove 6102 and the guide flared portion 6103 enables the sliding member 61 to more flexibly adapt to the clamping positioning member 4. The guide inclined surface 6104 designed in the process of moving the sliding member 61 will cause the positioning member 4 to move slightly along the movement trajectory, thereby improving the pre-tightening force between the sliding member 61 and the positioning member 4. This design improves the efficiency and accuracy of the assembly and locking of the mold, and ensures the stable locking of the mold in a high-pressure environment.

[0045] In this embodiment, the bottom of each locking plate 6101 is provided with a fixed block 6105 threadedly connected with the bidirectional screw 62, and the two fixed blocks 6105 are oppositely threadedly connected with the bidirectional screw 62.

[0046] It should be noted that the design that the fixed blocks 6105 are oppositely threadedly connected with the bidirectional screw 62 enables the two sliding members 61 to simultaneously move in opposite directions, thereby achieving a tight locking effect. This design enhances the locking force of the mold and improves the stability and durability of the mold under high-pressure environment.

[0047] In summary, the composite material forming mold based on the RTM process realizes stable locking of the mold through the cooperation and clamping of the positioning member 4 and the locking assembly 6. Specifically, the sliding member 61 in the locking assembly 6 can slide along the guide rail 23 and be clamped and cooperated with the annular groove 42 of the positioning member 4 at the bottom of the upper mold 1. Through the driving of the bidirectional screw 62 and the motor 63, fast and stable locking is achieved. The locking assembly 6 is directly cooperated with the positioning member 4, effectively avoiding the deformation and damage of the edge of the mold caused by the traditional locking structure when locking at the edge of the mold under long-term use and high-pressure environment. The mold not only has a fast locking function but also can prevent deformation, ensuring the uniformity of resin injection and the stability of the curing process in the RTM process.

[0048] Working principle: In the RTM process, first, the upper mold 1 and the lower mold 2 are closed to form the forming cavity 3. Then, the bidirectional screw 62 is driven to rotate by the motor 63, so that the two sliding members 61 slide along the guide rail 23 and move to both sides. The clamping sliding groove 6102 on the sliding member 61 is clamped and cooperated with the annular groove 42 on the positioning member 4, realizing preliminary locking of the mold. With the continuous rotation of the bidirectional screw 62, the two sliding members 61 continuously move to both sides until the maximum locking force is reached. At this time, the interference fit between the annular air-tight ring 11 and the air-tight groove 22 further enhances the sealing performance of the mold. During the resin injection and curing process, the mold remains in a stable and locked state, ensuring the uniformity of resin injection and the stability of the curing process. When it is necessary to unlock the mold, the bidirectional screw 62 is only needed to be driven to rotate by reversing the motor 63.

[0049] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A composite material molding die based on RTM technology, comprising an upper die, a lower die, and a locking assembly, characterized in that: The upper mold and the lower mold are closed to form a cavity. The locking component is located at the bottom of the lower mold, and positioning parts are provided at the four corners of the bottom of the upper mold. The positioning component has an annular groove in the middle, a threaded part that is threaded to the bottom of the upper mold is fixed at the upper end of the positioning component, and a chamfered part is fixedly installed at the lower end of the positioning component. The lower mold has positioning holes that mate with positioning components, and guide rails are fixedly installed on both sides of the bottom of the lower mold. The locking assembly includes two sliders that can engage with the annular groove and slide along the guide rail, a bidirectional screw threadedly connected to the two sliders, and a motor for driving the bidirectional screw to rotate.

2. The composite material molding die based on RTM process according to claim 1, characterized in that: The bottom of the upper mold is provided with an annular airtight ring, and the upper surface of the lower mold is provided with an airtight groove that is interference-fitted with the airtight ring. The thickness of the airtight ring is 1-2 mm greater than the depth of the airtight groove.

3. The composite material molding die based on RTM process according to claim 1, characterized in that: End blocks are fixedly installed on both sides of the lower mold located along the axis of the bidirectional screw. One end of the bidirectional screw is rotatably connected to the end block, and the other end passes through the end block and is fixedly installed to the output end of the motor.

4. A composite material molding die based on RTM process according to claim 1, characterized in that: The chamfered portion has a frustum-shaped structure that is larger at the top and smaller at the bottom, with a taper angle of 30°-45°.

5. A composite material molding die based on RTM process according to claim 1, characterized in that: The sliding member includes a locking plate, and each of the two locking plates has a clamping groove at its opposite ends that slides and engages with the annular groove of the sliding member on the same side.

6. A composite material molding die based on RTM process according to claim 5, characterized in that: The clamping groove has a guide flare at the opening, and the bottom of the locking plate has a guide slope that matches the movement trajectory of the positioning component.

7. A composite material molding die based on RTM process according to claim 6, characterized in that: Both locking plates have a fixing block installed at their bottom that is threaded to the bidirectional screw, and the two fixing blocks are threaded to the bidirectional screw in opposite directions.

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