CN116118056A - Composite material air inlet channel product forming tool based on memory core die - Google Patents

Abstract

The invention provides a molding tooling for composite air inlet products based on a memory mandrel, including: a memory mandrel, a mandrel forming device and a product forming device; the memory mandrel is a mandrel made of a memory material, which is softening and deformation after heating; the core mold molding device is used for forming the memory core mold, which includes a first upper mold, a support mold and a first lower mold, and the first upper mold, the first lower mold and the first lower mold A core mold cavity is formed around the supporting molds together; the product forming device includes a second upper mold and a second lower mold, and the second upper mold, the second lower mold and the memory core mold jointly A product cavity is formed around it. Compared with the prior art, the molding tooling of the composite air inlet product based on the memory mandrel of the present invention has simple structure, convenient operation, low manufacturing cost, and can realize the repeated use of the memory mandrel. The demoulding operation of composite products is more convenient.

Description

A molding tooling for composite air duct products based on memory mandrel

technical field

The invention relates to the technical field of composite material product molding, in particular to a composite material inlet product molding tooling based on a memory mandrel.

Background technique

With the continuous development and improvement of composite material manufacturing technology, more and more aircraft parts with complex shapes are made of composite materials, such as products with air inlets made of composite materials (hereinafter referred to as composite air inlet products) , the intake duct structure of the composite material intake duct product is complex and diverse, and splicing is not allowed, so the mold requirements are strict. Currently, by setting a metal core mold in the mold, the shape of the metal core mold matches the shape of the intake duct, but This kind of mandrel is inconvenient to demould, and can only be used for the inlet channel of a specific shape, which has great limitations.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings and deficiencies in the prior art, and provide a molding tool for composite air inlet products based on a memory mandrel.

An embodiment of the present invention provides a molding tool for composite air duct products based on a memory mandrel, including: a memory mandrel, a mandrel forming device and a product forming device.

The memory core mold is a core mold made of memory material, which softens and deforms after heating;

The core mold molding device is used for forming the memory core mold, which includes a first upper mold, a support mold and a first lower mold, and the support mold is arranged on the first upper mold and the first lower mold Between, when the first upper mold and the first lower mold are closed, the first upper mold, the first lower mold and the support mold jointly surround and form a core mold cavity, so The shape of the memory core mold matches the cavity of the core mold;

The product molding device includes a second upper mold and a second lower mold, the memory core mold is arranged between the second upper mold and the second lower mold, the second upper mold, the second lower mold Together with the memory core mold, a product cavity is formed.

Compared with the prior art, the forming tooling of the composite air inlet product based on the memory mandrel of the present invention has simple structure, convenient operation, low manufacturing cost, and can realize the repeated use of the memory mandrel. The demoulding operation of composite products is more convenient.

In some optional embodiments, the first upper mold and/or the first lower mold are provided with a plurality of first grooves, and the first grooves on the first upper mold are evenly arranged on The first upper mold is on a side away from the core mold cavity, and the first grooves on the first lower mold are uniformly arranged on a side of the first lower mold away from the core mold cavity.

In some optional embodiments, a first pressure equalizing plate is provided on a side of the first upper mold away from the cavity of the core mold.

In some optional embodiments, the first upper mold is provided with a plurality of first positioning pins, and the first positioning pins pass through the first upper mold and are connected to the first lower mold.

In some optional embodiments, the core mold cavity has a bent section, and the first upper mold and the first lower mold are detachably provided with auxiliary stripping modules, the first upper mold, The first lower mold, the supporting mold and the two auxiliary stripping modules jointly form the core mold cavity, and the two auxiliary stripping modules are arranged around the bending section.

In some optional embodiments, the second upper mold and/or the second lower mold are provided with a plurality of second grooves, and the second grooves on the second upper mold are evenly arranged on The second upper mold is on a side away from the product cavity, and the second grooves on the second lower mold are evenly arranged on a side of the second lower mold away from the product cavity.

In some optional embodiments, a second pressure equalizing plate is provided on a side of the second upper mold away from the product cavity.

In some optional embodiments, the second upper mold is provided with a plurality of second positioning pins, and the second positioning pins pass through the second upper mold and are connected to the second lower mold.

In some optional embodiments, the product forming device further includes two end blocking blocks, the end blocking blocks are connected with the second upper die and the second lower die, and the two end blocking blocks The two ends arranged around the memory mandrel respectively, the second upper die, the second lower die, the memory mandrel and the two end blocking blocks jointly form the product cavity, and the two The end blocking plates are respectively located at the two ends of the product cavity.

In some optional embodiments, after the memory core mold is shaped by the core mold forming device, a release auxiliary material is pasted on the outer surface of the memory core mold.

In order to have a clearer understanding of the present invention, the specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the structural representation of the core mold molding device of an embodiment of the present invention;

Fig. 2 is a schematic structural view of a product forming device according to an embodiment of the present invention;

Fig. 3 is a cross-sectional view of a core mold forming device according to an embodiment of the present invention;

Fig. 4 is an exploded view of a core mold forming device according to an embodiment of the present invention;

Fig. 5 is a cross-sectional view of a product forming device according to an embodiment of the present invention;

Figure 6 is an exploded view of a product forming device according to an embodiment of the present invention;

FIG. 7 is an enlarged view of point A shown in FIG. 5 .

Explanation of reference signs:

10. Memory mandrel; 21. First upper die; 22. Support die; 23. First lower die; 24. Core mold cavity; 25. First groove; 26. First equalizing plate; 27. First positioning Pin; 28. Auxiliary stripping module; 29. Eyebolt; 31. The second upper die; 32. The second lower die; 33. Product cavity; 34. The second groove; 35. The second equalizing plate; 36. The second 2. Locating pins; 37. End blocking plate; 40. Composite air inlet products.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Fig. 1 and Fig. 2, Fig. 1 is a schematic structural view of a mandrel molding device according to an embodiment of the present invention, Fig. 2 is a schematic structural view of a product forming device according to an embodiment of the present invention, the composite air intake based on the memory mandrel The product forming tooling includes: a memory core mold 10, a core mold forming device and a product forming device.

Memory mandrel 10 is a mandrel made of memory material, for example, polymer material can be used, memory mandrel 10 has a certain rigidity and hardness at room temperature, which meets the requirements as a mandrel, and memory mandrel 10 softens after heating The deformation returns to its original state. Moreover, the inside of the memory core mold 10 is hollow, which saves the material of the core mold and reduces the cost.

Please refer to Fig. 3 and Fig. 4, Fig. 3 is the sectional view of the core mold molding device of an embodiment of the present invention, Fig. 4 is the exploded view of the core mold molding device of an embodiment of the present invention, the core mold molding device is used for memory core mold 10, it comprises a first upper mold 21, a supporting mold 22 and a first lower mold 23, the supporting mold 22 is arranged between the first upper mold 21 and the first lower mold 23, and the first upper mold 21 and the first When the lower mold 23 is closed, a core mold cavity 24 is formed around the first upper mold 21 , the first lower mold 23 and the support mold 22 , and the shape of the memory core mold 10 matches the core mold cavity 24 .

Please refer to Fig. 5 and Fig. 6, Fig. 5 is the cross-sectional view of the product forming device of an embodiment of the present invention, Fig. 6 is the explosion view of the product forming device of an embodiment of the present invention, product forming device comprises the second upper die 31 and the first Two lower molds 32 , the memory core mold 10 is arranged between the second upper mold 31 and the second lower mold 32 , and the second upper mold 31 , the second lower mold 32 and the memory core mold 10 together form a product cavity 33 .

When manufacturing the composite air inlet product 40, the sheet material used to make the memory mandrel 10 is first attached to the support mold 22, the thickness of the attached sheet is preferably controlled at 2-4 mm, and then the support mold 22 is placed on the first lower mold 23, and then the first upper mold 21 and the first mold are closed, and after heating, compacting, and re-curing, a memory core mold whose outer surface conforms to the inner cavity profile of the air inlet product is formed 10, and then the first upper mold 21 and the first lower mold 23 are separated, and the support mold 22 is taken out from the memory core mold 10. Next, lay the prepreg for forming the composite air inlet product 40 on the surface of the memory mandrel 10, then place the memory mandrel 10 on the second lower mold 32, the second upper mold 31 and the second lower mold The mold 32 is closed, and the second upper mold 31 and the second lower mold 32 are pressed against each other, so that the prepreg is compacted and solidified, and then the product molding device is put into the heating furnace to heat the prepreg to further solidify and form The composite air inlet product 40, the memory mandrel 10 softens and deforms when heated, so that the memory mandrel 10 can be easily taken out from the composite air inlet product 40, the demoulding is very convenient, and the composite material inlet is not easy to be damaged. The inner wall of the inlet channel of the air channel product 40 improves the yield. Moreover, during subsequent processing, it is only necessary to attach the softened and deformed memory mandrel 10 to the outside of the support mold 22 again, and reshape it through the mandrel forming device to be repeatedly shaped and used. It should be noted that when the product molding device is heated in the heating furnace, because the prepreg already has a shape, even if the memory mandrel 10 softens during heating, it will not affect the curing of the composite air inlet product 40. The heating temperature of the heating furnace can be determined according to The temperature required by the actual composite air inlet product 40 is designed. For example, in this embodiment, the heating temperature of the heating furnace is 60°C.

In addition, it should be noted that if the support mold 22 cannot be taken out because of the shape of the memory core mold 10, the support mold 22 can be divided into multiple support blocks, and the multiple support blocks are detachably connected to each other, for example, the multiple support blocks are magnetically connected to each other. The mode of suction is connected with each other, thereby when support mold 22 is taken out, can take out one by one support block successively.

In order to facilitate the removal of the memory core mold 10 from the composite air inlet product 40, in some optional embodiments, after the memory core mold 10 is formed by the core mold forming device, a demoulding aid is attached to the outer surface of the memory core mold 10. Material, demoulding auxiliary material can be smooth demoulding auxiliary material such as polytetrafluoroethylene tape, and the outside of demoulding auxiliary material is smooth and sticky, so that the memory mandrel 10 is easy to separate from the composite air inlet product 40 after softening and deformation . Moreover, it is also more conducive to the smooth inner surface of the air inlet of the composite material air inlet product 40, so that the appearance surface quality of the composite air inlet product 40 is good and meets the requirements of production.

In some optional embodiments, the first upper mold 21 and/or the first lower mold 23 are provided with a plurality of first grooves 25, and the first grooves 25 on the first upper mold 21 are evenly arranged on the first upper mold 21. An upper mold 21 is away from the side of the core mold cavity 24 , and the first grooves 25 on the first lower mold 23 are evenly arranged on the side of the first lower mold 23 away from the core mold cavity 24 . The first groove 25 can reduce the weight of the first lower mold 23 and/or the first upper mold 21, and can increase the heat exchange area on the first lower mold 23 and/or the first upper mold 21, Improve heat transfer efficiency. In this embodiment, both the first upper mold 21 and the first lower mold 23 are provided with a first groove 25 .

In order to make the pressure on the memory core mold 10 more uniform when the first upper mold 21 and the first lower mold 23 are closed and compact the memory core mold 10, in some optional embodiments, the first upper mold 21 is far away from One side of the core mold cavity 24 is provided with a first pressure equalizing plate 26, and the force applying device applies pressure to the first upper mold 21 through the first pressure equalizing plate 26, thereby pressing the first upper mold 21 to the first lower mold 23, and the first upper mold 21 is pressed to the first lower mold 23. A pressure equalizing plate 26 makes the pressure on the first upper mold 21 more uniform, thereby making the pressure on the memory core mold 10 more uniform. Especially when the first upper die 21 is provided with the first groove 25 , the first pressure equalizing plate 26 can avoid the uneven force on the first upper die 21 due to the influence of the groove structure.

In order to improve the stability of the relative position of the first upper mold 21 and the first lower mold 23, in some optional embodiments, the first upper mold 21 is provided with a plurality of first positioning pins 27, and the first positioning pins 27 pass through The first upper mold 21 is then connected to the first lower mold 23 , and the first positioning pin 27 can make the relative positions of the first upper mold 21 and the first lower mold 23 difficult to shift, so as to avoid affecting the forming of the memory core mold 10 . In this embodiment, the first lower mold 23 is provided with a positioning hole for the first positioning pin 27 to extend into. In addition, the first lower mold 23 is also provided with a first guide pin, the first guide pin stretches into the guide hole on the first upper mold 21, and when the first upper mold 21 and the first lower mold 23 are closed, the first guide pin A guide pin can play a role in guiding the movement of the first upper mold 21 .

In order to facilitate the demoulding of the memory core mold 10, in some optional embodiments, the core mold cavity 24 has a bent section, and the first upper mold 21 and the first lower mold 23 are detachably provided with an auxiliary stripping module 28, The first upper mold 21, the first lower mold 23, the supporting mold 22, and the two auxiliary stripping modules 28 jointly form a core mold cavity 24, and the two auxiliary stripping modules 28 are arranged around the bending section, and when the memory core mold 10 is stripped During mould, first two auxiliary stripping modules 28 are pulled down from the first upper mold 21 and the first lower mold 23, and then the first upper mold 21 and the first lower mold 23 are separated, so that the memory core mold 10 is easier Detach from the first upper mold 21 and the first lower mold 23 to avoid difficulty in demoulding the memory core mold 10 due to the curved shape of the memory core mold 10 . In this embodiment, the auxiliary stripping module 28 is detachably connected with the first upper mold 21 and the first lower mold 23 through positioning pins

In some optional embodiments, the second upper mold 31 and/or the second lower mold 32 are provided with a plurality of second grooves 34, and the second grooves 34 on the second upper mold 31 are evenly arranged on the second The second upper mold 31 is away from the side of the product cavity 33 , and the second grooves 34 on the second lower mold 32 are evenly arranged on the side of the second lower mold 32 away from the product cavity 33 . The second groove 34 can reduce the weight of the second lower mold 32 and/or the second upper mold 31, and can increase the heat exchange area on the second lower mold 32 and/or the second upper mold 31, Improve heat transfer efficiency. In this embodiment, both the second upper mold 31 and the second lower mold 32 are provided with second grooves 34 .

In order to make the pressure on the prepreg more uniform when the second upper mold 31 and the second lower mold 32 are clamped and the prepreg is compacted, in some optional embodiments, the second upper mold 31 is far away from the product model. One side of the chamber 33 is provided with a second pressure equalizing plate 35, and the force applying device applies pressure to the second upper mold 31 through the second pressure equalizing plate 35, so that the second upper mold 31 is pressed to the second lower mold 32, and the second equalizing mold 31 is pressed against the second lower mold 32. The pressing plate 35 makes the pressure on the second upper mold 31 more uniform, thereby making the pressure on the prepreg more uniform, and thus making the molding quality of the composite air inlet product 40 better. Especially when the second upper mold 31 is provided with the second groove 34, the second pressure equalizing plate 35 can avoid the situation that the second upper mold 31 is subjected to uneven force due to the influence of the groove structure.

In order to improve the stability of the relative position of the second upper mold 31 and the second lower mold 32, in some optional embodiments, the second upper mold 31 is provided with a plurality of second positioning pins 36, and the second positioning pins 36 pass through The second upper mold 31 is then connected to the second lower mold 32 , and the second positioning pin 36 can make the relative positions of the second upper mold 31 and the second lower mold 32 not easy to shift, so as to avoid affecting the molding of the composite air inlet product 40 . In this embodiment, the second lower mold 32 is provided with a positioning hole for the second positioning pin 36 to extend into. In addition, a second guide pin is also provided on the second lower die 32, and the second guide pin extends into the guide hole on the second upper die 31, and when the second upper die 31 and the second lower die 32 are closed, the second guide pin The two guide pins can play a role in guiding the movement of the second upper mold 31 .

Please refer to FIG. 7 , which is an enlarged view of A shown in FIG. 5 , the prepreg is attached to the middle position of the memory mandrel 10 , and the two ends of the memory mandrel 10 have a certain length where no prepreg is arranged. The margin, the second upper mold 31 and the second lower mold 32 are abutted on the memory core mold 10 to block the two ends of the product cavity 33, but the composite air inlet product 40 is in a curved shape, which leads to the second upper mold When the mold 31 and the second lower mold 32 are demolding each other, it is easy to interfere with and squeeze the composite air inlet product 40, which makes demoulding difficult. In order to facilitate the demoulding of the composite air inlet product 40, some optional In the embodiment of the present invention, the product molding device also includes two end blocking plates 37, and the end blocking plates 37 are connected with the second upper die 31 and the second lower die 32. In this embodiment, the end blocking plates 37 are connected to the The second upper mold 31 and the second lower mold 32 are detachably connected. Two end block plates 37 are respectively arranged around the two ends of the memory mandrel 10, and the second upper mold 31, the second lower die 32, the memory mandrel 10 and the two end block plates 37 jointly form a product cavity 33, and the two The end blocking plates 37 are located at both ends of the product cavity 33 respectively, and the end blocking plates 37 are abutted on the memory mandrel 10, and the end blocking plates 37 are used to block the two ends of the composite material inlet channel product 40. When the inlet channel product 40 is demolded, the end block plate 37 is first removed from the second upper mold 31 and the second lower mold 32, and then the second upper mold 31 and the second lower mold 32 are separated, so that the second The structures of the upper mold 31 and the second lower mold 32 are easier to separate, making demoulding of the composite air duct product 40 easier.

In addition, in order to facilitate the movement of the core mold forming device and the product forming device, on both sides of the first upper die 21, on both sides of the first lower die 23, on both sides of the second upper die 31 and on both sides of the second lower die 32 Eyebolts 29 are all provided, and the eyebolts 29 can cooperate with other hoisting devices and transportation devices.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (10)

1. A composite air inlet product molding tool based on a memory mandrel, characterized in that it comprises: a memory mandrel, a mandrel forming device and a product forming device; The memory core mold is a core mold made of memory material, which softens and deforms after heating; The core mold molding device is used for forming the memory core mold, which includes a first upper mold, a support mold and a first lower mold, and the support mold is arranged on the first upper mold and the first lower mold Between, when the first upper mold and the first lower mold are closed, the first upper mold, the first lower mold and the support mold jointly surround and form a core mold cavity, so The shape of the memory core mold matches the cavity of the core mold; The product molding device includes a second upper mold and a second lower mold, the memory core mold is arranged between the second upper mold and the second lower mold, the second upper mold, the second lower mold Together with the memory core mold, a product cavity is formed. 2. A molding tool for composite air duct products based on a memory mandrel according to claim 1, characterized in that: the first upper mold and/or the first lower mold are provided with a plurality of first A groove, the first grooves on the first upper mold are evenly arranged on the side of the first upper mold away from the core mold cavity, and the first grooves on the first lower mold are evenly arranged It is arranged on the side of the first lower mold away from the cavity of the core mold. 3. A molding tool for composite air duct products based on a memory mandrel according to claim 1, characterized in that: the side of the first upper die far away from the core mold cavity is provided with a first pressure equalizing plate . 4. A molding tool for composite air duct products based on a memory mandrel according to claim 1, characterized in that: the first upper mold is provided with a plurality of first positioning pins, and the first positioning pins The pin is connected with the first lower die after passing through the first upper die. 5. A molding tool for composite air duct products based on a memory mandrel according to claim 1, characterized in that: the core mold cavity has a bending section, the first upper mold and the first An auxiliary stripping module is detachably arranged on the lower mold, and the first upper mold, the first lower mold, the support mold and the two auxiliary stripping modules are jointly surrounded to form the core mold cavity, Two of the auxiliary stripping modules are arranged around the bending section. 6. A molding tool for composite air duct products based on a memory mandrel according to any one of claims 1 to 5, characterized in that: the second upper mold and/or the second lower mold are A plurality of second grooves are provided, and the second grooves on the second upper mold are evenly arranged on the side of the second upper mold away from the product cavity, and the second grooves on the second lower mold are The two grooves are evenly arranged on the side of the second lower mold away from the product cavity. 7. A molding tool for composite air duct products based on a memory mandrel according to any one of claims 1 to 5, characterized in that: the second upper mold is set on a side far away from the product cavity There is a second equalizer plate. 8. A molding tool for composite air duct products based on a memory mandrel according to any one of claims 1 to 5, characterized in that: the second upper mold is provided with a plurality of second positioning pins, The second positioning pin is connected with the second lower die after passing through the second upper die. 9. A composite air duct product molding tool based on a memory mandrel according to any one of claims 1 to 5, characterized in that: the product molding device also includes two end blocking plates, the end block The blocking block is connected with the second upper die and the second lower die, and the two end blocking blocks are respectively arranged around the two ends of the memory mandrel, the second upper die, the second lower die , the memory mandrel and the two end-blocking plates jointly form the product cavity, and the two end-blocking plates are respectively located at two ends of the product cavity. 10. A molding tool for composite air duct products based on a memory mandrel according to any one of claims 1 to 5, characterized in that: after the memory mandrel is formed by the mandrel molding device, A demoulding auxiliary material is pasted on the outer surface of the memory core mold.

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