CN211729885U - Forming die for foam core expansion forming interlayer composite material - Google Patents
Forming die for foam core expansion forming interlayer composite material Download PDFInfo
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- CN211729885U CN211729885U CN201922035299.5U CN201922035299U CN211729885U CN 211729885 U CN211729885 U CN 211729885U CN 201922035299 U CN201922035299 U CN 201922035299U CN 211729885 U CN211729885 U CN 211729885U
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Abstract
The utility model relates to a foaming core material expansion moulding intermediate layer combined material's forming die, include: the device comprises a forming die upper die, an upper skin, a lower skin, a forming die lower die and a plurality of fixing devices; grooves matched with the shape of the foam preform are formed in the upper die of the forming die and the lower die of the forming die; the upper skin is positioned between the upper die of the forming die and the upper surface of the foam preform; the lower skin is positioned between the lower die of the forming die and the lower surface of the foam preform; the fixing device fixes an upper die of the forming die provided with the upper skin, the foam preform and the lower skin together with a lower die of the forming die. The utility model discloses do not use the hot press, so can use aluminium mould direct forming, reduce the operation degree of difficulty, improve factor of safety, simultaneously because need not use the autoclave just to reach segmentation pressor effect, reduced the cost of product on the basis of guaranteeing product quality, be favorable to sandwich structure combined material's popularization and application.
Description
Technical Field
The utility model relates to a forming die, concretely relates to do not use the hot press, so can use the direct shaping of aluminium mould, reduced the operation degree of difficulty, improved factor of safety, simultaneously because need not use the autoclave just to reach segmentation pressor effect, reduced the cost of product on the basis of guaranteeing product quality, be favorable to sandwich structure combined material's the simple structure's of popularization and application foaming core material expansion molding intermediate layer combined material's forming die.
Background
The sandwich structure composite material is a composite material which is widely applied at present, foam or paper honeycombs are selected as base materials, fiber fabrics are used as reinforcing materials, and the light and high-strength composite material can be obtained. The current main sandwich structure composite material forming process is a mould pressing method and an autoclave method, the two methods are to process and form a foam preform firstly and then lay the prepreg on the surface of a core mould for forming, the foam preform is not formed by a mould but obtained by machining and carving, the problem of no free form exists, in the thin-wall sandwich structure composite material forming process, the free form easily causes local dry yarn or foam to be layered with a skin, in addition, the mould pressing method can apply larger external pressure at the initial stage to cause the resin to flow out of the mould, the product is in short of glue, although the autoclave can realize segmented pressurization, the problem is solved, but the autoclave is high in cost and limits the application range.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide a hot press which does not use the hot press, so as to use the direct molding of the aluminum mold, reduce the operation difficulty, improve the safety factor, and reduce the cost of the product on the basis of ensuring the product quality because the hot press can is not needed, thereby being beneficial to the simple structure of the molding mold for the expansion molding of the foam core material of the sandwich structure composite material.
The utility model discloses a solve above-mentioned technical problem through following technical scheme: a molding die for foam core expansion molding of a sandwich composite material, the molding die comprising:
the device comprises a forming die upper die, an upper skin, a lower skin, a forming die lower die and a plurality of fixing devices;
grooves matched with the shape of the foam preform are formed in the upper die of the forming die and the lower die of the forming die;
the upper skin is positioned between the upper die of the forming die and the upper surface of the foam preform; the lower skin is positioned between the lower die of the forming die and the lower surface of the foam preform;
the fixing device fixes an upper die of the forming die provided with the upper skin, the foam preform and the lower skin together with a lower die of the forming die.
In the embodiment of the present invention: the fixing device is a bolt and nut combined fixing device, bolt holes are formed in the upper die and the lower die of the forming die respectively, and bolts penetrate through the bolt holes and then are fixed through nuts.
In the embodiment of the present invention: the thickness range of the upper skin is as follows: 1.0-1.5 mm.
In the embodiment of the present invention: the thickness range of the lower skin is as follows: 1.0-1.5 mm.
In the embodiment of the present invention: the upper skin and the lower skin are prepregs.
In the embodiment of the present invention: the prepreg is any one of carbon fiber, glass fiber and aramid fiber prepreg or the combination of several prepregs.
In the embodiment of the present invention: the lower die of the forming die comprises a lower die plane and a lower die groove, and the lower die groove is provided with an edge higher than the plane.
In the embodiment of the present invention: the height of the edge higher than the plane of the lower die is 1-5 mm.
In the embodiment of the present invention: and reinforcing ribs are adhered to the surface of the foam preform.
In the embodiment of the present invention: the upper die and the lower die of the forming die are aluminum dies.
The utility model discloses an actively advance the effect and lie in: the utility model provides a foaming core material expansion moulding intermediate layer combined material's forming die has following advantage:
1. baking and forming by using an oven without using a hot press or a hot pressing tank;
2. an aluminum die can be used, so that the operability of the forming process is enhanced, and the potential safety hazard of the forming process is reduced;
3. the shape of the foam obtained by the foaming mould is closer to the theoretical shape, and the defects of glue shortage, yarn drying, layering and the like caused by foam non-conformal can be better avoided in the forming process;
4. the characteristic that the foam expansion rate is changed with the temperature change in a turning way is utilized to realize the sectional pressurization, lower pressure is applied at lower temperature to prevent the resin from being extruded out in large quantity to cause the rubber shortage, higher pressure can be provided after the resin begins to be cured, and the product is ensured to be molded smoothly.
Drawings
FIG. 1 is a flow chart of a process for forming a sandwich structured composite material.
Fig. 2 is a schematic diagram of a sandwich structure composite material molding process.
The utility model discloses the name that well reference numeral corresponds:
the forming die comprises a forming die upper die 1, an upper skin 2, a foam preform 3, a lower skin 4, a forming die lower die 5, a fixing device 6, a lower die plane 501, a lower die groove 502 and an edge 503.
Detailed Description
The following provides a preferred embodiment of the present invention with reference to the accompanying drawings to explain the technical solutions of the present invention in detail.
The utility model provides a pair of foam core material inflation shaping sandwich structure combined material's forming die, figure 2 is sandwich structure combined material forming process's schematic diagram, as shown in figure 2: this forming structure mould includes: the forming die comprises an upper die 1 of the forming die, an upper skin 2, a lower skin 4, a lower die 5 of the forming die and a plurality of fixing devices 6; grooves matched with the shape of the foam preform 3 are formed in the upper forming die 1 and the lower forming die 5; the upper skin 2 is positioned between the upper die 1 of the forming die and the upper surface of the foam preform 3; the lower skin 4 is positioned between the lower die 5 of the forming die and the lower surface of the foam preform 3; the fixing device 6 fixes the upper mold 1 and the lower mold 5 of the molding mold, on which the upper skin 2, the foam preform 3, and the lower skin 4 are mounted.
In a specific fixing process, the fixing device 6 generally adopts a bolt and nut combined fixing device, see fig. 2. Bolt holes are formed in the upper die and the lower die of the forming die respectively, and bolts penetrate through the bolt holes and are fixed through nuts.
In specific implementation process, the utility model provides an upper skin 2's thickness scope does: 1.0-1.5mm, the thickness range of the lower skin 4 is: 1.0-1.5 mm. In the specific implementation process, the upper skin and the lower skin are prepreg, and the prepreg is any one of carbon fiber, glass fiber and aramid fiber prepreg or the combination of several prepregs.
Forming die lower die 5 includes lower die plane 501 and lower die recess 502, and lower die recess 502 is provided with border 503 higher than lower die plane 501. The height of the edge above the plane of the lower die may be 1-5 mm.
The utility model provides a foam preform, under the higher condition of requirement to product strength, can spread on the surface and paste the strengthening rib.
Fig. 1 is a flow chart of a sandwich structure composite material molding process, as shown in fig. 1: a molding process for foam core material expansion molding sandwich structure composite material comprises the following steps:
step 1: 2-3 layers of release agents are sprayed into the die cavities of the upper die 1 and the lower die 5 of the forming die, and the interval is 5-10min each time;
step 2: placing unfoamed foam raw materials in a foaming mold, heating to a foaming temperature, keeping the temperature for a period of time (10-20min), opening two side doors of an oven, naturally cooling the oven, taking out the mold and opening the mold after the oven is cooled to below 40 ℃ to obtain a molded foam preform;
and step 3: sanding burrs on the surface of the foam by using abrasive paper, and removing the release agent penetrating into the foam;
and 4, step 4: preheating an upper die and a lower die of a forming die respectively, and sticking a plurality of layers of prepreg on the preheated upper die and the preheated lower die of the forming die to be used as an upper skin and a lower skin; placing the molded foam preform on the lower skin, closing the mold, cutting off redundant foam and material sheets along the edge of the mold, and fastening the mold by using bolts;
and 5: and (3) placing the forming mold in an oven, heating to a forming temperature, keeping the temperature for a period of time, opening the oven door, naturally cooling the oven, taking out the mold when the temperature of the oven is reduced to be below 40 ℃, opening the mold, taking out the composite material rough blank with the sandwich structure, trimming and polishing burrs to obtain the formed rough blank.
In a specific embodiment, the prepreg may be any one of carbon fiber, glass fiber, aramid fiber prepreg, or a combination of several prepregs.
In a specific embodiment, 2-4 resin films can be adhered to the surface of the prepreg, and the total gram weight is 100-120g/m2。
The foaming temperature depends on the type of foam, and for polyurethane foam, the foaming temperature is controlled at 150 +/-5 ℃.
The temperature preservation period in the step 2 depends on the size of the mould and the type of foam, and is controlled within 10-20 min.
The number of layers of prepreg depends on the areal density of the prepreg, requiring the skin thickness not to exceed 1.5 mm.
The molding temperature is the prepreg curing temperature, and for the medium-temperature epoxy prepreg, the molding temperature is controlled to be 130 +/-5 ℃.
The following are three specific examples of implementation:
the first embodiment is as follows:
(1) and cleaning the die: coating 2 layers of mold release agent on the surface of the mold, wherein the interval is 5min each time;
(2) molding a foam preform: placing unfoamed polyurethane foam into a forming mold, heating to 150 ℃ within 30min, stopping heating, keeping the temperature for 10min, opening two side doors of an oven, naturally cooling the oven, taking out the mold and opening the mold after the oven is cooled to below 40 ℃ to obtain a formed foam preform;
(3) treating the foam preform: taking out the foam by using an air gun and a carbon sheet, polishing surface burrs by using No. 240 abrasive paper, removing a release agent soaked in the foam, and cutting the foam into corresponding sizes as required;
(4) and paving a paster sheet: preheating an upper die and a lower die of a forming die, and attaching 2 layers of films with the gram weight of 50g/m on the surface of the lower skin material sheet attached to the foam preform2After a layer of lower skin material sheet and reinforcing ribs are laid on the resin film, the resin film is put into a foam preform, a layer of reinforcing ribs is laid on the surface of the foam preform along the edge, and 2 layers of reinforcing ribs with the gram weight of 50g/m are also laid on the upper skin material sheet2The resin film is laid on an upper die of a forming die, corresponding notches are cut by a scalpel at the parts of the side material sheets slightly longer than the die, the left part and the right part are mutually overlapped, a baffle plate is installed after the resin film is finished, and the die is fastened by bolts;
(6) and forming a rough blank: and (3) placing the forming mold in an oven, heating to 130 ℃ within 30min, keeping the temperature for 20min, opening the oven door, naturally cooling the oven, taking out the mold for opening the mold when the oven is lowered to below 40 ℃, taking out the formed composite material rough blank with the sandwich structure by using an air gun and a carbon sheet, cutting edges and polishing burrs to obtain the formed rough blank.
Example two:
(1) and cleaning the die: coating 2 layers of mold release agent on the surface of the mold, wherein the interval is 10min each time;
(2) molding a foam preform: placing unfoamed polyurethane foam into a forming mold, heating to 150 ℃ within 35min, stopping heating, keeping the temperature for 15min, opening two side doors of an oven, naturally cooling the oven, taking out the mold and opening the mold after the oven is cooled to below 40 ℃ to obtain a formed foam preform;
(3) treating the foam preform: taking out the foam by using an air gun and a carbon sheet, polishing surface burrs by using No. 240 abrasive paper, removing a release agent soaked in the foam, and cutting the foam into corresponding sizes as required;
(4) and paving a paster sheet: preheating an upper die and a lower die of a forming die, and sticking 3 layers of films with the gram weight of 40g/m on the surface of the lower skin material sheet jointed with the foam preform2After a layer of lower skin material sheet and reinforcing ribs are laid on the resin film, the resin film is put into a foam preform, a layer of reinforcing ribs is laid on the surface of the foam preform along the edge, and 3 layers of reinforcing ribs with the gram weight of 40g/m are also laid on the upper skin material sheet2The resin film is laid on an upper die of a forming die, corresponding notches are cut by a scalpel at the parts of the side material sheets slightly longer than the die, the left part and the right part are mutually overlapped, a baffle plate is installed after the resin film is finished, and the die is fastened by bolts;
(5) and forming a rough blank: and (3) placing the forming mold in an oven, heating to 135 ℃ within 30min, keeping the temperature for 20min, opening the oven door, naturally cooling the oven, taking out the mold for opening the mold when the oven is lowered to below 40 ℃, taking out the formed composite material rough blank with the sandwich structure by using an air gun and a carbon sheet, cutting edges and polishing burrs to obtain the formed rough blank.
Example three:
(1) and cleaning the die: coating 3 layers of mold release agent on the surface of the mold, wherein the interval is 5min each time;
(2) molding a foam preform: placing unfoamed polyurethane foam into a forming mold, heating to 145 ℃ within 30min, stopping heating, keeping the temperature for 15min, opening two side doors of an oven, naturally cooling the oven, taking out the mold and opening the mold after the oven is cooled to below 40 ℃ to obtain a formed foam preform;
(3) treating the foam preform: taking out the foam by using an air gun and a carbon sheet, polishing surface burrs by using 400# abrasive paper, removing a release agent soaked in the foam, and cutting the foam into corresponding sizes as required;
(4) and paving a paster sheet: preheating an upper die and a lower die of a forming die, and sticking 3 layers of films with the gram weight of 40g/m on the surface of the lower skin material sheet jointed with the foam preform2After a layer of lower skin material sheet and reinforcing ribs are laid on the resin film, the resin film is put into a foam preform, a layer of reinforcing ribs is laid on the surface of the foam preform along the edge, and 3 layers of reinforcing ribs with the gram weight of 40g/m are also laid on the upper skin material sheet2The resin film is laid on the upper die of the forming die, and the part of the side material sheet slightly longer than the die is used by handsCutting corresponding notches by a scalpel, overlapping the notches left and right, installing a baffle after finishing, and fastening the die by using bolts;
(5) and forming a rough blank: and (3) placing the forming mold in an oven, heating to 130 ℃ within 30min, keeping the temperature for 20min, opening the oven door, naturally cooling the oven, taking out the mold for opening the mold when the oven is lowered to below 40 ℃, taking out the formed composite material rough blank with the sandwich structure by using an air gun and a carbon sheet, cutting edges and polishing burrs to obtain the formed rough blank.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.
Claims (10)
1. The utility model provides a forming die of foaming core expansion moulding intermediate layer combined material which characterized in that: the molding die includes:
the device comprises a forming die upper die, an upper skin, a lower skin, a forming die lower die and a plurality of fixing devices;
grooves matched with the shape of the foam preform are formed in the upper die of the forming die and the lower die of the forming die;
the upper skin is positioned between the upper die of the forming die and the upper surface of the foam preform; the lower skin is positioned between the lower die of the forming die and the lower surface of the foam preform;
the fixing device fixes an upper die of the forming die provided with the upper skin, the foam preform and the lower skin together with a lower die of the forming die.
2. The mold for molding a sandwich composite material by expansion molding of a foam core material according to claim 1, characterized in that: the fixing device is a bolt and nut combined fixing device, bolt holes are formed in the upper die and the lower die of the forming die respectively, and bolts penetrate through the bolt holes and then are fixed through nuts.
3. The mold for molding a sandwich composite material by expansion molding of a foam core material according to claim 1, characterized in that: the thickness range of the upper skin is as follows: 1.0-1.5 mm.
4. The mold for molding a sandwich composite material by expansion molding of a foam core material according to claim 1, characterized in that: the thickness range of the lower skin is as follows: 1.0-1.5 mm.
5. The mold for molding a sandwich composite material by expansion molding of a foam core material according to claim 1, characterized in that: the upper skin and the lower skin are prepregs.
6. The mold for molding a sandwich composite material by expansion of a foam core according to claim 5, wherein: the prepreg is any one of carbon fiber, glass fiber and aramid fiber prepreg.
7. The mold for molding a sandwich composite material by expansion molding of a foam core material according to claim 1, characterized in that: the lower die of the forming die comprises a lower die plane and a lower die groove, and the lower die groove is provided with an edge higher than the plane.
8. The mold for molding a sandwich composite material by expansion of a foam core according to claim 7, wherein: the height of the edge higher than the plane is 1-5 mm.
9. The mold for molding a sandwich composite material by expansion molding of a foam core material according to claim 1, characterized in that: and reinforcing ribs are adhered to the surface of the foam preform.
10. The mold for molding a sandwich composite material by expansion molding of a foam core material according to claim 1, characterized in that: the upper die and the lower die of the forming die are aluminum dies.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922035299.5U CN211729885U (en) | 2019-11-22 | 2019-11-22 | Forming die for foam core expansion forming interlayer composite material |
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| CN201922035299.5U CN211729885U (en) | 2019-11-22 | 2019-11-22 | Forming die for foam core expansion forming interlayer composite material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110919930A (en) * | 2019-11-22 | 2020-03-27 | 上海伽材新材料科技有限公司 | Forming die and forming process for foam core expansion forming interlayer composite material |
| WO2021237376A1 (en) * | 2020-05-23 | 2021-12-02 | 江苏莘翔机电股份有限公司 | Lft-d in-mold film coating process for building formwork |
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2019
- 2019-11-22 CN CN201922035299.5U patent/CN211729885U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110919930A (en) * | 2019-11-22 | 2020-03-27 | 上海伽材新材料科技有限公司 | Forming die and forming process for foam core expansion forming interlayer composite material |
| WO2021237376A1 (en) * | 2020-05-23 | 2021-12-02 | 江苏莘翔机电股份有限公司 | Lft-d in-mold film coating process for building formwork |
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