CN218366590U

CN218366590U - RTM mold

Info

Publication number: CN218366590U
Application number: CN202222321779.XU
Authority: CN
Inventors: 李明明; 卜祥威; 汪晓允; 胡世林
Original assignee: Jiangsu Hengshen Co Ltd
Current assignee: Jiangsu Hengshen Co Ltd
Priority date: 2022-09-01
Filing date: 2022-09-01
Publication date: 2023-01-24
Anticipated expiration: 2032-09-01

Abstract

The utility model discloses a RTM mould, which comprises an upper mould, a lower mould, a core mould device and a lateral mass device positioned at the periphery of the core mould device, wherein the core mould device and the lateral mass device are both connected on the lower mould; a forming space is formed among the core mould device, the side block device, the upper mould and the lower mould; the core mould device comprises a plurality of connected core moulds, and the connecting surfaces of two adjacent core moulds are provided with expansion pieces; the side block device comprises a plurality of connected side blocks, and the connecting surfaces of two adjacent side blocks are provided with expansion pieces. The utility model provides a mould, when using, the clearance between the mould mandrel, between the lateral mass has been eliminated to the inflation piece thermal expansion, has guaranteed that the resin flows according to predetermineeing the runner, has solved the problem that RTM injecting glue in-process easily produces dry spot, layering, and does not influence the manufacturing accuracy, improves the product and makes the qualification rate greatly.

Description

RTM mould

Technical Field

The utility model relates to the technical field of mold, concretely relates to RTM mould.

Background

At present, in the field of composite material forming, an RTM (resin transfer molding) forming process is a low-cost high-quality forming method, and has been widely applied to the fields of aviation, ships and military due to the advantages of integrated design, high precision and good surface quality.

For products with a multi-cavity structure, a multi-rib structure and the like with a closed structure, due to the fact that RTM is a closed die forming process, demolding is facilitated, and structural size precision is guaranteed.

However, due to the problem of the machining capability of the actual machine, the machining of the core mold has errors, so that a large number of gaps exist after the core mold is assembled, the core mold of the RTM mold is mostly of a curved surface structure, so that the machining error is larger, the fit gap of the core mold is larger, and the fit gap of the mold reaches 0.4mm at most; the design of a runner of the RTM mould is generally not more than 0.3mm, the core mould clearance has great influence on a resin flow path, and defects such as dry spots, looseness, layering and the like of a product are easily caused.

Disclosure of Invention

An object of the utility model is to provide a RTM mould to the RTM mould clearance influences the resin flow greatly among the solution prior art, causes the product dry spot, loose, layering scheduling problem.

In order to achieve the purpose, the utility model is realized by adopting the following technical scheme:

an RTM (resin transfer molding) mold comprises an upper mold, a lower mold, a core mold device and a side block device positioned on the periphery of the core mold device, wherein the core mold device and the side block device are connected to the lower mold; forming spaces among the core die device, the side block device, the upper die and the lower die;

the core mould device comprises a plurality of connected core moulds, and the connecting surfaces of two adjacent core moulds are provided with expansion pieces;

the side block device comprises a plurality of connected side blocks, and the connecting surfaces of two adjacent side blocks are provided with expansion pieces.

Further, the core mold device includes an intermediate core mold, a left core mold connected to a left side of the intermediate core mold, a right core mold connected to a right side of the intermediate core mold, a lower core mold connected to a front end of the intermediate core mold, and an upper core mold connected to a rear end of the intermediate core mold.

Furthermore, the middle core mold, the left core mold, the right core mold, the lower core mold and the upper core mold are connected with the lower core mold through positioning pins.

Further, the side block device comprises a first side block, a second side block, a third side block and a fourth side block which are sequentially arranged;

two adjacent side blocks are connected through a sheet-shaped expansion piece.

Furthermore, the side block I, the side block II, the side block III and the side block IV are connected with the lower core die through positioning pins.

Further, a core mold sealing groove and a side block sealing groove which are used for connecting a sealing element are further formed in the lower core mold, the core mold sealing groove is located in the projection of the core mold device on the lower core mold, and the side block sealing groove is located in the projection of the side block device on the lower core mold.

Furthermore, still be equipped with the die seal groove that is used for connecting the sealing member on the mandrel down, the die seal groove is located the outside of lateral mass device projection on the mandrel down.

Further, a gap for connecting the expansion piece is arranged between two adjacent core moulds, and the size of the gap is smaller than 2mm;

and a gap for connecting the expansion piece is arranged between two adjacent side blocks, and the size of the gap is smaller than 2mm.

Furthermore, a boss for preventing the expansion piece from being crushed is arranged on the connecting surface of two adjacent side blocks.

Further, the expansion member has a coefficient of thermal expansion of more than 10 ^-5 An expansion member made of the material of (1).

According to the above technical scheme, the embodiment of the utility model has following effect at least:

1. according to the mold, the expansion piece is designed on the connecting surface of the two adjacent core molds, the expansion piece is arranged on the connecting surface of the two adjacent side blocks, when the mold is used, the expansion piece is heated and expanded, gaps between the core molds and between the side blocks of the mold are eliminated, the resin is guaranteed to flow according to a preset flow channel, the problems of dry spots and layering easily caused in the RTM glue injection process are solved, the manufacturing precision is not influenced, and the product manufacturing qualified rate is greatly improved;

2. the expansion piece is designed on the connecting surface of the two adjacent core moulds, the expansion piece is arranged on the connecting surface of the two adjacent side blocks, so that no gap exists between the matching surfaces of the moulds, the core moulds and the side blocks are manufactured without adopting a high-precision machining process through the design of the expansion piece, and the manufacturing cost of the moulds is reduced.

Drawings

FIG. 1 is a cross-sectional view of a mold according to an embodiment of the present invention;

FIG. 2 is a top view of the lower mold according to the embodiment of the present invention;

FIG. 3 is a schematic structural view of a lower mold mounting core mold and a side block according to an embodiment of the present invention;

fig. 4 is a schematic view of a second side block in the embodiment of the present invention.

Wherein: 1. a T-shaped window frame; 2. a lower die; 201. a primary flow channel; 202. a secondary flow channel; 203. a die sealing groove; 204. a core mold sealing groove; 205. a side block sealing groove; 3. an upper die; 4. an intermediate core mold; 5. a left core mold; 9. a core mould is arranged; 8. a right core mold; 801. a right core mold glue outlet; 10. a lower core mold; 6. a first side block; 7. a second side block; 701. a glue outlet of the side block II; 702. a boss; 703. a mating surface; 12. a third side block; 11. side block four; 13. an expansion member.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.

It should be noted that, in the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", etc. indicate the directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for convenience of description of the present invention but do not require the present invention to be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. As used in the description of the present invention, the terms "front," "back," "left," "right," "up," "down" and "in" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

This application adopts the scheme of the mode design mould of rubber pellicular and metallic structure, adopts the high thermal expansion characteristic of rubber materials, eliminates the mould clearance, makes the resin flow according to the design route, reaches the process controllable to solve product layering, loose, dry spot problem, promote product quality, qualification rate. Meanwhile, the requirement on the machining precision of the non-molding surface of the core mold of the mold is reduced, and the manufacturing cost of the mold can also be reduced to a certain degree.

As shown in fig. 1 to 4, an RTM mold includes an upper mold 3, a lower mold 2, a core mold means and a side block means at a periphery of the core mold means, the core mold means and the side block means being connected to the lower mold 2; a forming space is formed among the core mould device, the side block device, the upper mould 3 and the lower mould 2; the core mould device comprises a plurality of connected core moulds, and the connecting surfaces of two adjacent core moulds are provided with expansion pieces; the side block device comprises a plurality of connected side blocks, and the connecting surfaces of two adjacent side blocks are provided with expansion pieces.

The utility model provides a mould is connected the face design inflation piece, the face of being connected of two adjacent side pieces of two adjacent mandrels and is equipped with the inflation piece, and during the use, the inflation piece is heated the inflation, has eliminated the clearance between the mould mandrel, between the side piece, has guaranteed that the resin flows according to predetermineeing the runner, has solved the problem that RTM injecting glue in-process easily produced dry spot, layering, and does not influence the manufacturing accuracy, improves the product greatly and makes the qualification rate.

The RTM mould of this application can be based on the different products of producing of the shape of mandrel device, side piece device, last mould die cavity face and lower mould die cavity face. The following examples are specifically described for the production of T-shaped window frames.

The RTM mould of the T-shaped window frame consists of an upper mould 3, a lower mould 2, a core mould device, a side block device and an expansion piece. A core mold sealing groove 204, a side block sealing groove 205 and a mold sealing groove 203 are sequentially formed in the lower mold 2 from the inside to the outside. Specifically, the core mold sealing groove 204 is located in the projection of the core mold device on the lower mold 2, the side block sealing groove 205 is located in the projection of the side block device on the lower mold 2, and the expansion members are mounted on both the core mold sealing groove 204 and the side block sealing groove 205. Because the core mold sealing groove 204 and the side block sealing groove 205 are strip-shaped seals, the expansion piece can be made of standard rubber materials which can be purchased directly or O-shaped sealing strips which are commonly used in the market. The core mold seal groove 204 and the side block seal groove 205 are designed to prevent resin from flowing out of a main molding space formed between the core mold device and the side block device.

Similarly, the expansion member installed in the mold sealing groove 203 may be made of a standard size rubber material that can be purchased directly, or an O-ring seal strip that is commercially available, so as to achieve sealing between the lower mold 2 and the upper mold 3.

The core mold device comprises a plurality of core molds, specifically, a middle core mold 4 is connected with the lower mold through bolt positioning pins, and a left core mold 5, a right core mold 8, a lower core mold 10 and an upper core mold 9 are connected and positioned with the lower mold 2 through positioning pins. The side block device comprises a first side block 6, a second side block 7, a third side block 12 and a fourth side block 11, and the four side blocks are connected and positioned with the lower die 2 through positioning pins.

Furthermore, the contact surfaces among the middle core mould 4, the left core mould 5, the right core mould 8, the lower core mould 10 and the upper core mould 9 are respectively provided with an expansion piece, the mutual contact surfaces of the side blocks I6, II 7, III 12 and IV 11 are also provided with expansion pieces, the thickness of the expansion pieces can be designed according to the actual situation, but the universal thickness is recommended to be selected, so that the manufacture or direct purchase is convenient.

As shown in fig. 1 to 3, the contact surfaces of the intermediate core mold 4, the left core mold 5, the right core mold 8, the lower core mold 10, and the upper core mold 9 are in full-surface contact, and the expansion member may be a sheet-shaped expansion member. Similarly, the contact between the first side block 6, the second side block 7, the third side block 12 and the fourth side block 11 is the whole surface contact, and the expansion piece can be a sheet-shaped expansion piece 13.

The core mould device is in an oval shape as a whole, the side block device is positioned on the periphery of the core mould device, a main forming space of the T-shaped window frame is formed between the side block device and the core mould device, and the forming space of the T-shaped window frame is formed by matching with the cavity surface of the upper mould 3 and the cavity surface of the lower mould 2, so that the forming of the T-shaped window frame is ensured.

In some further embodiments, the size of the gap between two adjacent core dies for connecting the expansion pieces is less than 2mm, so as to ensure that the expansion pieces can fill the whole gap after being expanded by heat.

In some embodiments, a boss 702 is further disposed on the connecting surface of two adjacent side blocks, the boss 702 is used for preventing the expansion piece between the matching surfaces 703 from being crushed during assembly of the side blocks, and the length of the boss 702 is about 1mm, so that installation of the expansion piece is ensured, and the expansion piece can be heated and expanded to fill the whole gap. Similarly, the connecting surface of two adjacent core moulds can be provided with a boss.

In some further embodiments, the expansion member has a coefficient of thermal expansion greater than 10 ^-5 The expansion piece made of the material ensures the thermal expansion effect of the expansion piece. The material of the expansion piece can be rubber products such as silicon rubber, fluororubber and the like.

The forming process of the T-shaped window frame is roughly as follows: after the T-shaped window frame prefabricated body mold is assembled, mold closing (installation of the lower mold 2, the core mold device and the side block device) is started, and after the mold closing is completed, the mold is heated. Along with the temperature rise of the mold, the expansion piece made of the high expansion material is heated to expand, and gaps between the core mold of the mold and the core mold and between the core mold and the upper mold 3 and the lower mold 2 are eliminated; after entering the mold, the resin flows through the first-stage runner 201 and the second-stage runner 202 to contact the T-shaped window frame prefabricated body of the product, fiber permeation is uniform, and finally glue is respectively discharged from the second glue outlet 701 of the side block and the glue outlet 801 of the right core mold (the same glue outlets are arranged on other core molds and side blocks).

It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of the invention or which are equivalent to the scope of the invention are embraced by the invention.

Claims

1. An RTM mold is characterized by comprising an upper mold (3), a lower mold (2), a core mold device and a side block device positioned on the periphery of the core mold device, wherein the core mold device and the side block device are both connected to the lower mold (2); a forming space is formed among the core die device, the side block device, the upper die (3) and the lower die (2);

2. The RTM mold according to claim 1, wherein the core mold means comprises an intermediate core mold (4), a left core mold (5) attached to a left side of the intermediate core mold (4), a right core mold (8) attached to a right side of the intermediate core mold (4), a lower core mold (10) attached to a front end of the intermediate core mold (4), and an upper core mold (9) attached to a rear end of the intermediate core mold (4).

3. The RTM mold according to claim 2, wherein the middle core mold (4), the left core mold (5), the right core mold (8), the lower core mold (10) and the upper core mold (9) are connected to the lower mold (2) by a positioning pin.

4. The RTM mold according to claim 1, wherein said side block means comprises a first side block (6), a second side block (7), a third side block (12) and a fourth side block (11) arranged in sequence;

two adjacent side blocks are connected through a sheet-shaped expansion piece (13).

5. The RTM mold according to claim 4, wherein the side block one (6), the side block two (7), the side block three (12) and the side block four (11) are connected to the lower mold (2) by means of locating pins.

6. The RTM mold according to claim 1, wherein the lower mold (2) is further provided with a core mold sealing groove (204) for connecting a sealing member and a side block sealing groove (205), the core mold sealing groove (204) is located in a projection of the core mold means on the lower mold (2), and the side block sealing groove (205) is located in a projection of the side block means on the lower mold (2).

7. The RTM mold according to claim 1, wherein the lower mold (2) further comprises a mold sealing groove (203) for connecting a sealing member, wherein the mold sealing groove (203) is located outside a projection of the side block device on the lower mold (2).

8. The RTM mold according to claim 1, wherein a gap for connecting the swelling member is provided between two core molds adjacent to each other, and the size of the gap is less than 2mm;

9. An RTM mould according to claim 1, wherein adjacent side blocks are provided with a boss (702) at the junction face to prevent crushing of the expansion element.

10. The RTM mold of claim 1, wherein the expansion member is of a coefficient of thermal expansion greater than 10 ^-5 An expansion member made of the material of (1).