CN111993682B - Forming tool and manufacturing method for composite material corner strip structural part - Google Patents
Forming tool and manufacturing method for composite material corner strip structural part Download PDFInfo
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- CN111993682B CN111993682B CN202010693719.3A CN202010693719A CN111993682B CN 111993682 B CN111993682 B CN 111993682B CN 202010693719 A CN202010693719 A CN 202010693719A CN 111993682 B CN111993682 B CN 111993682B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/345—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using matched moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
Abstract
The invention provides a forming tool and a preparation method of a composite material angle bar structural member; laying carbon fiber resin prepreg on a core mold, closing a movable outer mold, heating the whole body after the mold is assembled, and carrying out pressurized heat curing molding to obtain a composite material fillet structure member; an angular convex part is arranged above the core mould, and a concave part matched with the angular convex part in shape is arranged below the movable outer mould; thermal expansion silicon rubber is arranged above the movable external mold, and the pressure required by the molding of the composite material is provided by the heating expansion of the thermal expansion silicon rubber. Compared with the prior art, the contact surface of the die and the composite material is angular, the angle strip structural part can be directly formed, and the finished product does not need to be cut again, so that the surface of the obtained product is flat, and the size precision is high; in addition, the method of pressurizing the product by utilizing the thermal expansion silicon rubber in the oven saves energy consumption, can form the long-length angle strip structural member, and is suitable for engineering application.
Description
Technical Field
The invention relates to the technical field of forming of composite material structural parts, in particular to a forming tool and a manufacturing method of a composite material corner strip structural part.
Background
The angle bar structural member based on the carbon fiber resin matrix composite material is light in weight and designable, can bear high load and strong vibration, and has been developed into one of important bearing structural members in various aerospace devices. However, because the member has a long length and a special shape, the member is often formed into a U-shaped or square-shaped member by autoclave molding or press molding, and then cut into angular members. The method has the problems that firstly, when the structural part is cut, the surface of the structural part is not flat due to the fact that the structural part is long and stress release is not uniform, and application is influenced; secondly, the molding of a single structural member cannot be carried out, which causes waste; finally, autoclave molding methods are costly, and the compression molding process places more restrictions on the length of the structural member.
Upon search of the prior patent documents, CN101890807A discloses a method for press molding a composite material part by utilizing thermal expansion of silicone rubber; the molding and curing of the composite material product are realized by the temperature rise of the autoclave and the curing oven and the expansion and pressurization of the silicon rubber. However, the scheme in the patent requires direct contact between the silicon rubber and the surface of the composite material part, provides forming pressure for a product in direct contact, belongs to the conventional application, has poor product surface forming quality, influences the use of subsequent products, and is not suitable for pressing the composite material angle strip structural member.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a forming tool and a preparation method of a composite material corner strip structural part; the method comprises the following steps: the design of the composite material angle strip structural part mould and the forming method are changed. The contact surface between the die and the composite material is angular, the angle strip structural member can be directly formed, and the finished product does not need to be cut again, so that the surface of the obtained product is flat, and the size precision is high. In addition, the method of pressurizing the product by utilizing the thermal expansion silicon rubber in the oven saves energy consumption, can form the long-length angle strip structural member, and is suitable for engineering application.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a molding preparation method of a composite material angle bar structural member, which comprises the steps of laying carbon fiber resin prepreg on a core mold in a mold, closing a movable outer mold, heating the whole body after the mold is assembled, and carrying out pressurized heat curing molding to obtain the composite material angle bar structural member; an angular convex part is arranged above the core mould, and a concave part matched with the angular convex part in shape is arranged below the movable outer mould; thermal expansion silicon rubber is arranged above the movable external mold, and the movable external mold is driven to extrude the composite material to provide pressure required by molding through the heating expansion of the thermal expansion silicon rubber.
In one embodiment of the present invention, the thermal expansion silicone rubber has a volume expansion amount of 0.07%/DEG C to 0.1%/DEG C and a bulk modulus of elasticity of 220MPa to 350 MPa. According to the composite material corner strip, when carbon fiber resin prepreg is laid, due to the fact that prepreg layers are not compacted, the thickness of a product after laying is thick, the product needs to be pressed to the theoretical thickness under forming pressure provided by thermal expansion silicon rubber, the thickness change of the product is about 30%, and the size change part needs to be filled through silicon rubber expansion. In order to ensure that the thermal expansion silicone rubber can provide enough forming pressure and does not influence the die filling when the thickness of a product is thicker, the silicone rubber is required to meet the performance parameters in the existing curing temperature range.
As a technical scheme of the invention, the thinnest part of the movable external mold is required to be more than or equal to 30 mm.
As a technical scheme of the invention, the method comprises the following steps:
s1, horizontally placing the core mold, laying the carbon fiber resin prepreg above the core mold, and placing the movable outer mold above the carbon fiber resin prepreg;
s2, fixing a left external mold on the left side of the core mold, and fixing a right external mold on the right side of the core mold;
s3, placing thermal expansion silicon rubber above the movable outer die, placing the upper outer die above the thermal expansion silicon rubber, and fixing the upper outer die above the left outer die and the right outer die respectively to complete die assembly;
and S4, placing the assembled mould into a heating device, heating to the required curing temperature, and keeping the temperature until the carbon fiber resin prepreg is cured to obtain the composite material angle bar structural member.
In step S4, the heating device is a blower oven. The contact surface of the core mold and the composite material is angular. The contact surface of the movable outer die of the die and the composite material is in an inverted angle shape.
The invention also relates to a composite material angle strip structural member mould which mainly comprises a fixed external mould, a core mould, a movable external mould and thermal expansion silicon rubber; the fixed outer die is composed of an upper outer die, a left outer die and a right outer die, the upper outer die is connected with the left outer die and the right outer die through fastening parts respectively, a cavity is formed by the space below the upper outer die and the space between the left outer die and the right outer die, the core die is located below the cavity and is connected with the left outer die and the right outer die through fastening parts respectively, an angular convex part is arranged above the core die, the movable outer die is located above the core die in the cavity, a concave part matched with the convex part in shape is arranged below the movable outer die, and the thermal expansion silicon rubber is arranged above the movable outer die. The mould is special equipment for the molding preparation method of the composite material angle bar structural member.
As one technical scheme of the invention, the angular convex part is provided with a left inclined surface and a right inclined surface which are intersected at the highest part of the convex part.
As one technical solution of the present invention, the core mold is provided with a first slope portion and a second slope portion on the left and right sides of the angular protrusion portion, the first slope portion intersects with the left slope at a right angle at the bottom of the left slope, and the second slope portion intersects with the right slope at a right angle at the bottom of the right slope.
As a technical scheme of the invention, the surface of the movable external mold is provided with a glue overflow air guide groove, and the arrangement area is a joint area of the movable external mold and the core mold. In particular to a highest convex part of a core mould, a first inclined part and a second inclined part.
As one technical scheme of the invention, the thermal expansion silicon rubber is positioned between the movable external mold and the fixed external mold.
As a technical scheme of the invention, the fixed outer die, the core die and the movable outer die are all made of hard alloy steel.
Compared with the prior art, the invention has the following beneficial effects:
1) by adopting the method, the problem of uneven surface of the structural part caused by the previous forming process can be improved to a great extent, and the size precision of a finished product is higher;
2) by adopting the method of the invention, a single product can be molded, the thermal expansion silicon rubber can be repeatedly utilized, and the cost is effectively saved;
3) according to the angle strip structural member forming tool, extra forming pressure is provided without using high-pressure gas or vacuum assistance, the forming tool is heated, and a blast oven can meet the use requirement;
4) the method of the invention utilizes the blast oven to heat and mold under the conditions of air and normal pressure, and the oven thermal molding process is simple to operate and more energy-saving compared with the autoclave molding process; compared with the compression molding process, the length of the structural member is less limited, and the angular structural member with longer length can be prepared.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is an external structural view of the assembled mold;
FIG. 2 is a view of the internal structure of the mold after assembly;
FIG. 3 is a schematic view (turning over) of the glue overflow groove of the movable outer mold;
wherein, 1 is a fixed external mold, 2 is a core mold, 3 is a movable external mold, 4 is thermal expansion silicon rubber, 5 is composite material, and 6 is an overflow rubber air guide groove.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the concept of the invention. All falling within the scope of the present invention.
Examples
The method of the invention is based on the method of mould pressing and thermosetting molding of the composite material. The mold structure is shown in fig. 2; the structure diagram of the assembled mold during the molding process is shown in fig. 1. The mould mainly comprises a fixed external mould 1, a core mould 2, a movable external mould 3 and thermal expansion silicon rubber 4; the fixed outer die 1 consists of an upper outer die, a left outer die and a right outer die, the upper outer die is respectively connected with the left outer die and the right outer die through fastening parts (screws and the like), a cavity is formed by spaces below the upper outer die, between the left outer die and the right outer die, the core die 2 is positioned below the cavity and is respectively connected with the left outer die and the right outer die through the fastening parts, an angular bulge is arranged above the core die 2, the angular bulge is provided with a left inclined plane and a right inclined plane which are intersected at the highest part of a bulge (the highest part is a straight line), and an included angle formed by the left inclined plane and the right inclined plane can be an acute angle, a right angle or an obtuse angle; the movable external mold 3 is positioned above the core mold 2 in the cavity, a concave part matched with the shape of the convex part is arranged below the movable external mold 3, and the thermal expansion silicon rubber 4 is arranged above the movable external mold 3. Is positioned between the movable external mold 3 and the fixed external mold. The specific size of the die is determined according to the size of the manufactured angle structural part; the thinnest part of the movable outer die is required to be more than or equal to 30 mm; the volume expansion amount of the thermal expansion silicon rubber is 0.07%/DEG C-0.1%/DEG C, and the volume elastic modulus is 220 MPa-350 MPa; the fixed external mold, the core mold and the movable external mold are all made of hard alloy steel.
The forming tool and the preparation method of the composite material angle strip structural part comprise the following steps:
the core mold 2 is horizontally placed, and the carbon fiber resin prepreg is flatly laid on the core mold 2, wherein the specific thickness is based on the requirements of the structural member.
The movable external mold 3 is placed on the carbon fiber resin prepreg.
The left and right external molds are fixed on the two sides of the core mold 2 and the movable external mold 3. Specifically, the left outer mold may be fixed to the left side of the core mold 2 by a fastening member, and the right outer mold may be fixed to the right side of the core mold 2 by a fastening member, in which case the movable outer mold 3 is located between the left outer mold and the right outer mold.
A heat-expandable silicone rubber 4 is placed on the movable external mold 3. The heat-expandable silicone rubber can be recycled.
The upper outer mold is placed on the thermal expansion silicon rubber 4 and fixed above the left and right outer molds through fastening parts respectively.
After the whole mold is assembled, the whole mold is placed into an oven to be heated, the thermal expansion silicon rubber 4 is heated to expand to provide pressure required by forming of the composite material 5, specifically, the temperature is raised to a required curing temperature and is kept for a certain time, and the carbon fiber resin prepreg is cured to obtain the composite material 5.
After curing, the die and the thermal expansion silicon rubber 4 are removed, and the composite material angle bar structural member with higher required precision is obtained.
As a preferable mode of this embodiment, as shown in fig. 2, the core mold is provided with a first slope portion and a second slope portion on the left and right sides of the angular protrusion portion, the first slope portion intersects with the left slope at the bottom of the left slope at a right angle, and the second slope portion intersects with the right slope at the bottom of the right slope at a right angle. The core mold is in contact with the movable outer mold in a fitting manner at the convex part, and the thickness of the product is ensured by the concave structure size of the lower surface of the movable outer mold.
As a preferable mode of this embodiment, as shown in fig. 3, the surface of the movable outer mold is provided with a flash gas guide groove 6, and the region is a region where the movable outer mold and the core mold are attached. In particular to a highest convex part of a core mould, a first inclined part and a second inclined part.
In summary, the present invention employs an angular core mold and a movable outer mold, and the product is cured by pressing with heat-expandable silicone rubber in an oven. The whole process is simple to operate, raw materials and energy are saved, and the obtained composite material structural member has regular surface and higher dimensional precision and is suitable for engineering application.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation/be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (6)
1. A molding preparation method of a composite material corner strip structural part is characterized in that carbon fiber resin prepreg is laid on a core mold in a mold, when the carbon fiber resin prepreg is laid, prepreg layers are not compacted, a movable outer mold is then closed, thermal expansion silicon rubber is arranged above the movable outer mold, the mold is integrally heated after being assembled, the thermal expansion silicon rubber is heated and expanded to drive the movable outer mold to extrude a composite material to provide pressure required by molding, the composite material corner strip structural part is obtained by molding, and high-pressure gas or vacuum assistance is not needed to provide additional molding pressure; an angular convex part is arranged above the core mould, and a concave part matched with the angular convex part in shape is arranged below the movable outer mould; the volume expansion amount of the thermal expansion silicon rubber is 0.07%/DEG C-0.1%/DEG C, and the volume elastic modulus is 220 MPa-350 MPa;
the mould for forming and preparing the composite material angle strip structural member mainly comprises a fixed external mould, a core mould, a movable external mould and thermal expansion silicon rubber; the fixed outer die consists of an upper outer die, a left outer die and a right outer die, the upper outer die is respectively connected with the left outer die and the right outer die through fastening parts, a cavity is formed by the space below the upper outer die and the space between the left outer die and the right outer die, the core die is positioned below the cavity and is respectively connected with the left outer die and the right outer die through fastening parts, an angular convex part is arranged above the core die, the movable outer die is positioned above the core die in the cavity, a concave part matched with the convex part in shape is arranged below the movable outer die, and the thermal expansion silicon rubber is arranged above the movable outer die; in the mould, the angular convex part is provided with a left inclined plane and a right inclined plane which are intersected at the highest part of the convex part; the core mould is provided with a first inclined part and a second inclined part on the left side and the right side of the angular convex part, the first inclined part is intersected with the left inclined plane at the bottom of the left inclined plane at a right angle, and the second inclined part is intersected with the right inclined plane at the bottom of the right inclined plane at a right angle.
2. The method for molding and preparing the composite material angle bead structural member as claimed in claim 1, wherein the thinnest part of the movable outer mold is required to be more than or equal to 30 mm.
3. The method for forming and preparing the composite material corner strip structural member according to claim 1 or 2, wherein the method comprises the following steps:
s1, horizontally placing the core mold, laying the carbon fiber resin prepreg above the core mold, and placing the movable outer mold above the carbon fiber resin prepreg;
s2, fixing a left external mold on the left side of the core mold, and fixing a right external mold on the right side of the core mold;
s3, placing thermal expansion silicon rubber above the movable outer die, placing the upper outer die above the thermal expansion silicon rubber, and fixing the upper outer die above the left outer die and the right outer die respectively to complete die assembly;
and S4, placing the assembled mould into a heating device, heating to the required curing temperature, and keeping the temperature until the carbon fiber resin prepreg is cured to obtain the composite material angle bar structural member.
4. The method for forming and preparing the composite material angle bead structure member of claim 3, wherein in the step S4, the heating device is a blast oven.
5. The method for molding and preparing the composite material angle bead structural member according to claim 1, wherein in the mold, the surface of the movable outer mold is provided with a glue overflow air guide groove, and the setting area is a joint area of the movable outer mold and the core mold.
6. The method for molding and preparing the composite material corner strip structural member according to claim 1, wherein the heat-expandable silicone rubber is positioned between a movable external mold and a fixed external mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010693719.3A CN111993682B (en) | 2020-07-17 | 2020-07-17 | Forming tool and manufacturing method for composite material corner strip structural part |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010693719.3A CN111993682B (en) | 2020-07-17 | 2020-07-17 | Forming tool and manufacturing method for composite material corner strip structural part |
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| CN111993682A CN111993682A (en) | 2020-11-27 |
| CN111993682B true CN111993682B (en) | 2022-08-12 |
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| CN201970385U (en) * | 2011-03-24 | 2011-09-14 | 山东平阴丰源炭素有限责任公司 | Forming mould of anode green bodies |
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| CN110884164A (en) * | 2019-12-30 | 2020-03-17 | 合肥联合飞机科技有限公司 | Forming process of fan with sandwich structure made of carbon fiber composite material |
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| US20110104432A1 (en) * | 2008-03-07 | 2011-05-05 | Airbus | Method and device for moulding a curved part made from composite material and corresponding part |
| US20160159014A1 (en) * | 2013-06-20 | 2016-06-09 | Thyssenkrupp Presta Ag | Component made of a fiber composite material and process for producing same |
| CN105313345A (en) * | 2015-01-19 | 2016-02-10 | 北京盛华瑞科技有限公司 | Fabrication technology for thermoplastic composite product for airplane main/auxiliary force-bearing components |
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| CN111993682A (en) | 2020-11-27 |
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