CN223278585U - A barrel-type RTM resin transfer heating molding mold - Google Patents

Abstract

The utility model relates to a barrel-shaped RTM resin transfer heating molding mold. Existing molds result in incomplete resin impregnation of preforms, long mold installation time, and a high probability of error, which affects product quality. The utility model includes a core mold and an outer mold. The core mold is sleeved in the outer mold. The upper part of the small diameter end and the upper part of the large diameter end of the core mold are respectively provided with a sealing groove. The outer mold is surrounded by four arc-shaped pieces in a ring shape. The two side edges of each arc-shaped piece are respectively turned outward, and threaded holes are provided on the turned edges. The 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, which is built on the limiting step of the core mold. 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. The two opposite arc-shaped pieces are provided with a glue injection port, and the other two opposite arc-shaped pieces are provided with a glue outlet. The utility model has the characteristics of simple structure, easy operation, high precision, good sealing, and long service life.

Description

Barrel-type RTM resin transfer heating forming die

Technical Field

The utility model relates to the technical field of RTM resin forming dies, in particular to a barrel-type RTM resin transfer heating forming die.

Technical Field

The RTM molding process is a closed-mold molding technology improved from the hand lay-up molding process, and the basic principle is that a reinforcing material (such as glass fiber or carbon fiber) is laid in a mold cavity of a closed mold, then a low-viscosity resin is injected into the mold cavity by pressure, so that the reinforcing material is soaked by the resin, and finally the reinforcing material is cured and molded.

The RTM molding process has the characteristics of high product performance, high cost and efficiency advantages, environment and health friendliness, mature material process, capability of preparing large complex components and the like, is widely used for manufacturing parts on satellites and missiles, and has important technical background and wide prospect in the application of the aerospace field.

In the RTM forming process, the quality of the die relates to the surface quality, the internal quality, the dimensional accuracy and the like of the product, and the final quality of the product is directly influenced, so that the design of the RTM forming die plays a crucial role in the whole RTM forming process.

The mold is a hypersonic weapon heat-proof sleeve forming mold in the aerospace field, and has extremely high requirements on the quality and the yield of products due to special use scenes and high raw material cost of the products. The existing barrel-type RTM die is designed to be two halves in many outer dies, so that the working hours of die assembly can be saved, but the prefabricated body is easy to be pressed unevenly during die assembly, wrinkles are generated, and the product quality is affected. And the glue injection port and the glue outlet of the RTM die are arranged horizontally and vertically, so that the resin is easy to cut off when the resin is injected, and the phenomenon similar to a short circuit phenomenon is caused, so that the preform is not completely soaked in the resin, and the product quality is affected. In order to ensure the precision of the die cavity, the prior RTM die can also design a large number of positioning parts, thereby greatly increasing the working hour of die filling and the probability of misoperation.

Disclosure of utility model

In view of this, the present utility model provides a barrel-type RTM resin transfer heating molding die.

The technical scheme includes that the barrel-type RTM resin transfer heating forming die comprises a core die and an annular outer die, wherein the core die is sleeved in the annular outer die, the core die is in a T-shaped column shape, a sealing groove I is respectively arranged at the upper part of a small diameter end and the upper part of a large diameter end of the T-shaped column core die, the outer die is surrounded into an annular shape by 4 arc-shaped sheets, two side edges of each arc-shaped sheet are respectively turned outwards, threaded holes are formed in the turned-over edges, two adjacent arc-shaped sheets are connected through bolts, a step is concavely arranged on the lower side of the inner wall of each arc-shaped sheet, the step is arranged on a limiting step of the core die in a lap-joint mode, a boss is arranged outside the upper side of the inner wall, a sealed barrel-type die cavity is formed by combining the core die and the outer die, glue injection ports are formed in two opposite arc-shaped sheets, and glue outlets are formed in the other two opposite arc-shaped sheets.

Further, the glue injection port is arranged at the lower end of the arc-shaped sheet and staggered in a bilateral symmetry manner, and the glue outlet is arranged at the upper end of the arc-shaped sheet and staggered in a bilateral symmetry manner.

Further, the two side flanging of each arc-shaped piece is also provided with a second sealing groove.

Further, hanging ring holes are symmetrically formed in the top of the core mold.

Further, the first seal groove is annular, has a width of 5mm and a depth of 3mm.

Further, the die has a height of 450 mm-550mm and a diameter of 350-450 mm, and the material is 45# steel.

Compared with the prior art, the utility model has the advantages that:

1) According to the utility model, the core mold and the outer mold are both provided with the limiting steps, so that the mold structure is simplified, small parts such as positioning pins in the thickness direction of the mold cavity are omitted, and the risk of misoperation is reduced.

2) The outer mold passes through the 4 arc-shaped piece ring, and the prefabricated body is elastic and generally thicker than the mold cavity because the prefabricated body needs to be sleeved on the core mold in advance when the mold is used, and the prefabricated body needs to be compacted by the outer mold, so that the outer mold passes through the 4 arc-shaped piece ring, the 4 arc-shaped pieces can enable the compaction of the prefabricated body to be more uniform, and the generation of wrinkles is reduced.

3) The utility model has the characteristics of simple structure, easy operation, high precision, good sealing performance, long service life and the like.

Drawings

Fig. 1 is an exploded view of the present utility model.

Fig. 2 is a schematic structural view of a core mold.

Fig. 3 is a side view of either of the outer molds.

Fig. 4 is a schematic structural view of an outer mold assembly.

Fig. 5 is a schematic structural view of the present utility model.

The marking instruction comprises 1, a first outer mold, 2, a second outer mold, 3, a third outer mold, 4, a fourth outer mold, 5, a core mold, 6, a limit step, 7, a hanging ring hole, 8, a first seal groove, 9, a threaded connection port, 10,

Positioning pin holes; 11, limiting steps at the lower end of the outer die, 12, a boss, 13, an outer die butt joint surface, 14, a glue outlet, 15, a glue injection port, 16 and a second sealing groove.

Detailed Description

In the description of the present utility model, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in a specific case.

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The embodiment provides a barrel-type RTM resin transfer heating forming die, as shown in fig. 1-5, including mandrel 5 and annular external mold, mandrel 5 is located mandrel 5 card in it through the spacing step 11 of external mold lower extreme on the annular external mold and boss 12 of upper end, and the mould height is 500mm, diameter is 400mm, and the material is 45# steel, and 45# steel has good comprehensive mechanical properties, can improve mould precision and life.

As one implementation mode of the embodiment, the core mold 5 is of a T-shaped column shape, the upper part of the small diameter end and the upper part of the large diameter end of the core mold 5 of the T-shaped column are respectively provided with an annular sealing groove I8, the width is 5mm, the depth is 3mm, sealing strips are arranged in the sealing grooves I8, the sealing performance of the mold is guaranteed, the lower end of the core mold 5 is provided with a limiting step 6 for guaranteeing the thickness of a lower half part of the mold cavity, and 2 hanging ring holes 7 are symmetrically formed in the top of the core mold 5 and used for installing hanging rings, as shown in fig. 2.

The lower ends of the first outer die and the third outer die are respectively provided with a glue injection port 15, and the upper ends of the second outer die and the fourth outer die are respectively provided with a glue outlet 14. The glue injection port at the 2 is designed at the lower ends of the first outer die and the third outer die, the glue outlet at the 2 is designed at the upper ends of the second outer die and the fourth outer die, and the glue injection ports are staggered in bilateral symmetry, so that the resin can be more uniformly and sufficiently impregnated into the fiber preform during glue injection, the production of air holes in a product is effectively reduced, and the performance, the surface and the internal quality of the product are improved.

As one implementation mode of the embodiment, the outer die is formed by encircling 4 arc-shaped sheets, two side edges of each arc-shaped sheet are respectively turned outwards, a threaded connection port 9 and a positioning pin hole 10 are arranged on an outer die butt joint surface 13 of the turned edge and are used for positioning and fastening the outer die and simultaneously improving the strength of the outer die, two adjacent arc-shaped sheets are connected through bolts, a second sealing groove 16 is further arranged at the turned edge on two sides of each arc-shaped sheet, sealing is achieved through sealing strips in the second sealing groove 16, a step is concavely arranged on the lower side of the inner wall of each arc-shaped sheet, the step is arranged on a limiting step 6 of a core die 5 in a lap mode, a boss 12 is arranged on the upper side of the inner wall, the core die 5 and the outer die are combined to form a sealed barrel-shaped die cavity, and the boss 12 is clamped on the upper portion of the core die and is used for guaranteeing the thickness of a product, as shown in figures 1, 3 and 4.

The working method of the utility model comprises the following steps:

1) When the mold is used, sealing strips with the thickness of 5.5mm are firstly arranged in sealing grooves of the core mold and the outer mold (note that the connecting parts of the sealing strips are connected in an oblique angle lap joint mode, and silicone rubber is smeared at the lap joint part), and release agents are sprayed on the working surfaces of the core mold and the outer mold or Teflon is stuck on the working surfaces of the core mold and the outer mold, so that the product can be conveniently demoulded after being molded.

2) The fiber preform is fitted over the mandrel (note that, due to the lower strength of the fiber preform, the violent fitting is prohibited so as not to damage the fiber preform).

3) When the outer mold is installed, the limiting step at the lower end of the outer mold is aligned with the step at the lower end of the core mold, the first outer mold, the second outer mold, the third outer mold and the fourth outer mold are sequentially installed (the corresponding positions of the four outer molds are needed to be noted, the corresponding positions between the mold core and the four outer molds are not needed to be considered), and the positioning pin and the locking bolt are installed.

4) After the installation is finished, the glue injection procedure can be carried out through the glue injection port and the glue outlet.

5) After the product is molded, the outer mold is disassembled in sequence, and the product is lifted upwards while rotating on the core mold, so that the demolding can be easily performed.

In the above description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may be practiced in other ways than those described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed above.

The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (6)

1. A barrel-type RTM resin transfer heating forming die is characterized by comprising a core die (5) and an annular outer die, wherein the core die (5) is sleeved in the annular outer die, the core die is of a T-type column shape, a sealing groove I (8) is respectively arranged at the upper part of a small diameter end and the upper part of a large diameter end of the T-type column core die, the outer die is formed by encircling 4 arc-shaped sheets into an annular shape, two side edges of each arc-shaped sheet are respectively turned outwards, threaded holes are formed in the turned-over edges, two adjacent arc-shaped sheets are connected through bolts, a step is concavely formed in the lower side of the inner wall of each arc-shaped sheet, the step is arranged on a limiting step (6) of the core die (5), a boss (12) is arranged on the upper side of the inner wall, a sealed barrel-type die cavity is formed by combining the core die (5) with the outer die, a glue injection port (15) is formed in the two opposite arc-shaped sheets, and a glue outlet (14) is formed in the two opposite arc-shaped sheets.

2. The barrel-type RTM resin transfer heating forming mold according to claim 1, wherein the glue injection port (15) is disposed at the lower end of the arc-shaped piece and is staggered in a bilateral symmetry manner, and the glue outlet (14) is disposed at the upper end of the arc-shaped piece and is staggered in a bilateral symmetry manner.

3. A barrel type RTM resin transfer heating forming die according to claim 1 or 2, wherein a second sealing groove (16) is further provided at both side flanges of each arcuate piece.

4. A barrel type RTM resin transfer heating forming mold 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 type RTM resin transfer heating forming die according to claim 4, wherein the first sealing groove (8) is annular, has a width of 5mm and a depth of 3mm.

6. The barrel type RTM resin transfer heating forming mold according to claim 5, wherein the mold has a height of 450 mm-550mm, a diameter of 350-450 mm, and a material of 45# steel.