CN115923197A - Air bag core mold for forming variable-curvature variable-section large-thickness omega-shaped pipeline piece and manufacturing and using methods thereof - Google Patents
Air bag core mold for forming variable-curvature variable-section large-thickness omega-shaped pipeline piece and manufacturing and using methods thereof Download PDFInfo
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- CN115923197A CN115923197A CN202211490688.7A CN202211490688A CN115923197A CN 115923197 A CN115923197 A CN 115923197A CN 202211490688 A CN202211490688 A CN 202211490688A CN 115923197 A CN115923197 A CN 115923197A
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Abstract
The invention discloses an air bag core mould for forming a variable-curvature variable-section large-thickness omega-shaped pipeline piece and a manufacturing and using method thereof, wherein the air bag core mould is prepared by paving and pasting a composite material by using a special forming mould, the outer profile of the air bag core mould is completely consistent with the inner cavity shape of the omega-shaped pipeline piece to be formed, and the air bag core mould is mainly characterized by having certain rigidity and can be directly paved and pasted as a paving and pasting mould in the paving and pasting process of a workpiece, so that the molding efficiency of the workpiece is improved; and two ends of the air bag core mold are provided with openings and can be communicated with the external atmosphere in the autoclave, so that the uniform pressure of the inner cavity of the omega-shaped pipeline piece is ensured, and the internal quality of the piece is effectively ensured. The air bag core mold forming method is simple, the air bag core mold is not required to be damaged during demolding, the shape correction can be carried out through tire returning after demolding, and the air bag core mold is reusable and has good practical and popularization values.
Description
Technical Field
The invention relates to an air bag core mold for molding variable-curvature variable-section large-thickness omega-shaped pipeline pieces and a manufacturing and using method thereof.
Background
The resin-based carbon fiber composite material has superior performances of high specific strength and specific stiffness, strong designability, good fatigue fracture resistance, corrosion resistance, good dimensional stability and the like, and becomes an important application material in the field of aerospace. In recent years, the design and manufacturing level of civil aircraft composite material members in China make great progress, and the composite material is also applied to the development of commercial aircraft engines.
The aircraft engine part has a complex structure and comprises a plurality of special-shaped pipeline parts, and the pipeline parts have the characteristics of large curvature, severe change of the section of the part and the like, for example, an omega-shaped pipeline part is shown in figure 1, the section of the pipeline part is in an omega shape, the pipeline part is characterized by a double curvature structure, the curvature is large, the section of the part is severely changed, and the wall thickness is thick. The structures of the special-shaped pipeline parts cause that the manufacturing and the forming of the composite material are difficult. At present, a core mould is generally adopted for molding the special-shaped pipeline part by hot-press molding, and the type of the commonly used core mould is an expansion mould, namely a rubber air bag core mould or a mould made of other materials is adopted, so that the inner cavity of the composite material part can be pressurized by utilizing the self expansion effect during hot-press molding of the part, and the part is molded. However, the existing expansion die has poor shape following capability, the fitting degree is produced at the position of the area with severe curvature change of the pipeline part, the pressurization on the inner cavity of the position with severe curvature change of the pipeline part is difficult to be uniform, and the internal quality of the area with severe profile change is difficult to ensure; and the rigidity of the existing expansion core mold is not enough, particularly for the product with variable curvature and variable cross section and large thickness, the existing core mold has insufficient support degree, so that the molded surface deviation of the product is caused, and the product qualification rate is low. In addition, the existing expansion core mold is difficult to demold after a product is molded, the core mold can not be reused after being taken out by dissolution or destruction, so that the loss of the mold is large, and the manufacturing cost of the product is high.
Disclosure of Invention
Aiming at the problems existing in the forming of the prior variable-curvature variable-section large-thickness omega-shaped pipeline, the invention provides the air bag core mold for forming the variable-curvature variable-section large-thickness omega-shaped pipeline and the using method thereof, so that the thickness of a workpiece is controllable, the quality of the molded surface and the interior is lossless, the molded surface and the interior are qualified, the appearance is smooth and flat, and the mechanical property meets the requirements. The specific technical scheme is as follows:
firstly, the invention provides an air bag core mould for forming a variable-curvature variable-section large-thickness omega-shaped pipeline fitting, which is prepared by paving a composite material through a special forming mould, has certain rigidity and is provided with openings at two ends; the integral characteristic of the air bag core mold is self-adaptability, the outer molded surface of the air bag core mold is completely consistent with the inner cavity of the omega-shaped pipeline piece to be molded, and the air bag core mold can be matched with a variable-curvature variable section.
The air bag core mold for molding the variable-curvature variable-section large-thickness omega-shaped pipeline fitting comprises an inner rubber layer, a prepreg reinforcing layer and an outer rubber layer; the thickness of the inner rubber layer and the outer rubber layer is 1-2 mm, and the thickness of the prepreg reinforcing layer is 0.15-0.4 mm.
According to the air bag core mold for molding the variable-curvature variable-section large-thickness omega-shaped pipeline piece, the prepreg reinforcing layer is made of thermosetting epoxy resin carbon fiber materials, and the thicknesses of the prepreg reinforcing layer at all positions of the air bag core mold are consistent.
The special forming die comprises an upper valve plate and a lower valve plate, wherein the upper valve plate and the lower valve plate are respectively provided with a concave die; the inner cavity of the upper petal mold is consistent with the profile of the inner cavity of the cap-shaped part of the omega-shaped pipeline piece, and the inner cavity of the lower petal mold is consistent with the profile of the inner cavity of the bottom of the omega-shaped pipeline piece; and the inner cavity of the two split molds after being assembled is completely consistent with the outer shape surface of the air bag core mold.
Secondly, the invention provides a preparation method of the airbag core mold, which comprises the following steps: and (3) paving and pasting an outer rubber layer, a prepreg reinforcing layer and an inner rubber layer of the air bag core mold on the upper flap mold and the lower flap mold in sequence, closing the upper flap mold and the lower flap mold after paving and pasting, fixing and combining by adopting a positioning pin, packaging, then sending into an autoclave for curing, and after curing is finished, removing the forming mold.
According to the preparation method of the air bag core mold, the outer rubber layer, the prepreg reinforcing layer and the inner rubber layer of the air bag core mold are paved on the upper flap mold and the lower flap mold, the thicknesses of the layers of the upper flap mold and the lower flap mold are consistent, and the equal thickness characteristic of the formed air bag core mold is ensured by paying attention to the layer loss design.
In the preparation method of the airbag core mold, the curing process parameters are as follows: the temperature is 150-200 ℃, and the pressure is 0.5-0.65 Mpa.
The invention further provides a use method of the airbag core mold, which specifically comprises the following steps: directly paving and pasting the composite material of the corresponding part of the inner cavity of the omega-shaped pipeline piece to be molded on the air bag core mold, then packaging the composite material and the rest part of the composite material paving mold in a combined manner, then sending the composite material paving mold into an autoclave for curing, demolding after curing is finished, taking out the air bag core mold in a vacuumizing manner, and reusing the air bag core mold after returning to a furnace for shape correction.
In the using method of the air bag core mold, during demolding, the molded omega-shaped pipeline piece is heated to 60-80 ℃, one end of the air bag core mold is sealed, and then the air bag core mold is vacuumized, so that the air bag core mold is taken out from the inner cavity of the omega-shaped pipeline piece after being contracted; the step of shape righting by furnace returning is that the taken out gasbag core mould is put back into the special forming mould and shape righting by furnace returning is carried out under the conditions that the temperature is 150 ℃ to 200 ℃ and the pressure is 0.5 MPa to 0.65MPa.
The invention has the following beneficial effects:
1) The shape of the core mould of the air bag core mould is consistent with the molded surface of the inner cavity of the workpiece by adopting a special forming mould, so that the appearance quality of the inner cavity of the workpiece can be effectively ensured when the core mould is used.
2) The core die of the air bag core is made of rubber and thermoplastic prepreg, has certain rigidity, can be directly paved as a paving die in the paving and pasting process of a workpiece, and improves the molding efficiency of the workpiece.
3) The air bag core mold is used as a paving mold, the inner cavity part of the variable-curvature variable-section large-thickness omega-shaped pipeline piece is paved on the outer side of the core mold, and is combined with other components after paving, so that the air bag core mold has high adaptability, and can be well jointed with an inner cavity area with severe change of a molded surface of a workpiece under high temperature and high pressure, so that the pressure of the inner cavity of the workpiece is ensured to be uniform, and the internal quality of the area with severe change of the molded surface is ensured.
4) The air bag core mold forming method is simple, the core mold does not need to be damaged during demolding, the core mold can be taken out in a vacuumizing or heating mode, the demolded core mold can be reshaped and reused by returning the mold, the mold cost is saved, the consistency of molds used by various batches of parts is ensured, the consistency of the quality of the parts is ensured, and the air bag core mold forming method has good practical and popularization values.
Drawings
FIG. 1 is a schematic structural view of a variable-curvature variable-section large-thickness omega-shaped pipe fitting;
FIG. 2 is a schematic view of the construction of the balloon mandrel of the present invention;
FIG. 3 is a schematic structural view of the valve on the forming mold special for preparing the air bag core mold according to the present invention;
FIG. 4 is a schematic structural view of a lower valve of a forming mold special for preparing an air bag core mold according to the present invention;
fig. 5 is a schematic longitudinal section view of an upper flap mold of an airbag core mold prepared by the method of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the embodiments and the accompanying drawings, and it is to be understood that the described embodiments are merely preferred embodiments of the present invention, rather than all embodiments, and are not intended to limit the present invention in other forms, and that any person skilled in the art may make changes or modifications using the technical contents disclosed. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Example 1
The present embodiment is an airbag core mold for forming variable curvature variable cross section large thickness omega-shaped pipe fittings, as shown in fig. 2, the airbag core mold is prepared by using a special forming mold to spread and stick composite materials, and the outer surface of the airbag core mold is completely consistent with the inner cavity of the omega-shaped pipe fitting to be formed. The airbag core mold is mainly characterized by certain rigidity, and can be used as a paving mold to be directly paved and pasted in the paving and pasting process of a workpiece, so that the molding efficiency of the workpiece is improved; and both ends of the air bag core mold are opened, and the air bag core mold can be communicated with the external atmosphere in the autoclave, so that the uniform pressure of the inner cavity of the omega-shaped pipeline piece is ensured, and the internal quality of the piece is effectively ensured. The integral characteristic of the air bag core mold is self-adaptability, the outer molded surface of the air bag core mold is completely consistent with the inner cavity shape of an omega-shaped pipeline piece to be molded, and the air bag core mold can be matched with a variable curvature variable section.
Specifically, the airbag core mold for molding the variable-curvature variable-section large-thickness omega-shaped pipeline fitting comprises an inner rubber layer, a prepreg reinforcing layer and an outer rubber layer; wherein, the thickness of the inner rubber layer and the outer rubber layer is 1-2 mm, and the thickness of the prepreg reinforced layer is 0.15-0.4 mm. The prepreg reinforcing layer is made of thermosetting epoxy resin carbon fiber materials, and the thicknesses of the prepreg reinforcing layer at all positions of the full-air-bag core mold are consistent. The special forming die for forming the air bag core die comprises an upper flap die and a lower flap die, and as shown in fig. 3 and 4, the upper flap die and the lower flap die are female dies; the inner cavity of the upper petal mold is consistent with the profile of the inner cavity of the cap-shaped part of the omega-shaped pipeline piece, and the inner cavity of the lower petal mold is consistent with the profile of the inner cavity of the bottom of the omega-shaped pipeline piece; and the positions of the two split molds are positioned at the R angle of the connection between the bottom wall of the omega-shaped pipeline piece and the pipe wall, and the inner cavity of the two split molds after being closed is completely consistent with the outer profile of the air bag core mold.
The preparation method of the air bag core mold comprises the following steps: the outer rubber layer, prepreg reinforcing layer and inner rubber layer of the air bag core mold are sequentially laid on the upper flap mold and the lower flap mold, as shown in fig. 5. And after the paving and the adhering are finished, closing the upper split mold and the lower split mold, fixing and combining by adopting a positioning pin, packaging, then sending into an autoclave for curing, and after the curing is finished, removing the forming mold. Spread outer rubber layer, preimpregnation material enhancement layer and the interior rubber layer of pasting the gasbag mandrel on last lamella mould and lower lamella mould, go up the lamella thickness unanimous of lamella mould and lower lamella mould, and notice losing the layer design, guarantee the uniform thickness characteristic of shaping gasbag mandrel, its technological parameter of solidification is in the autoclave: the temperature is 150-200 deg.C, and the pressure is 0.5-0.65 Mpa.
The use method of the airbag core mold in the embodiment comprises the following steps: directly paving and pasting the composite material of the corresponding part of the inner cavity of the omega-shaped pipeline piece to be molded on the air bag core mold, then packaging the composite material and the rest part of the composite material paving mold in a combined manner, then sending the composite material paving mold into an autoclave for curing, demolding after curing is finished, taking out the air bag core mold in a vacuumizing manner, and reusing the air bag core mold after returning to a furnace for shape correction. And heating the formed omega-shaped pipeline to 60-80 ℃ during demoulding, sealing one end of the air bag core mould, and then vacuumizing to enable the air bag core mould to be contracted and then taken out from the inner cavity of the omega-shaped pipeline. And the step of remelting straightening is to put the taken airbag core mold back into the special forming mold and perform remelting straightening under the conditions that the temperature is 150-200 ℃ and the pressure is 0.5-0.65 Mpa.
The shape of the core mould of the air bag core mould is consistent with the molded surface of the inner cavity of the workpiece by adopting a special forming mould, so that the appearance quality of the inner cavity of the workpiece can be effectively ensured when the core mould is used. The core die of the air bag core die is made of rubber and thermoplastic prepreg, has certain rigidity, can be directly paved as a paving die in the paving and pasting process of a workpiece, and improves the molding efficiency of the workpiece. The inner cavity part of the omega-shaped pipeline piece is laid on the air bag core mould and then combined with other components, so that the air bag core mould has high adaptability, and can be well attached to an inner cavity area with severe change of the molded surface of the piece under high temperature and high pressure, thereby ensuring the uniform pressure of the inner cavity of the piece and ensuring the internal quality of the area with severe change of the molded surface. The core mold of the air bag core mold is not required to be damaged during demolding, the core mold can be taken out in a vacuumizing or heating mode, the core mold after demolding can be used for shape correction and reuse through tire returning, mold cost is saved, consistency of molds used by various batches of parts is guaranteed, consistency of part quality is guaranteed, and the core mold has good practical and popularization values.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. The utility model provides a be used for become fashioned gasbag mandrel of big thickness omega type pipe fitting of camber variable cross-section which characterized in that: the air bag core mold is prepared by paving and pasting a composite material on a special forming mold, has certain rigidity, and has openings at two ends; the integral characteristic of the air bag core mold is self-adaptability, the outer molded surface of the air bag core mold is completely consistent with the inner cavity of the omega-shaped pipeline piece to be molded, and the air bag core mold can be matched with a variable-curvature variable section.
2. The balloon core mold for molding variable-curvature variable-section large-thickness omega-shaped pipeline pieces as claimed in claim 1, wherein: the air bag core mold comprises an inner rubber layer, a prepreg reinforcing layer and an outer rubber layer; the thickness of the inner rubber layer and the outer rubber layer is 1-2 mm, and the thickness of the prepreg reinforcing layer is 0.15-0.4 mm.
3. The air bag core mold for molding the variable-curvature variable-section large-thickness omega-shaped pipeline piece as claimed in claim 2, is characterized in that: the prepreg reinforcing layer is made of thermosetting epoxy resin carbon fiber materials, and the thicknesses of the prepreg reinforcing layer at all positions of the full-air-bag core mold are consistent.
4. The balloon core mold for molding variable-curvature variable-section large-thickness omega-shaped pipeline pieces as claimed in claim 1, wherein: the special forming die comprises an upper valve and a lower valve, and the upper valve and the lower valve are female dies; the inner cavity of the upper petal mold is consistent with the profile of the inner cavity of the cap-shaped part of the omega-shaped pipeline piece, and the inner cavity of the lower petal mold is consistent with the profile of the inner cavity of the bottom of the omega-shaped pipeline piece; and the inner cavity of the two split molds after being assembled is completely consistent with the outer shape surface of the air bag core mold.
5. A method of making an air-bag core form according to any of claims 1 to 4, characterised in that: and (3) paving and pasting an outer rubber layer, a prepreg reinforcing layer and an inner rubber layer of the air bag core mold on the upper flap mold and the lower flap mold in sequence, closing the upper flap mold and the lower flap mold after paving and pasting, fixing and combining by adopting a positioning pin, packaging, then sending into an autoclave for curing, and after curing is finished, removing the forming mold.
6. The method of making an airbag core mold as in claim 5, wherein: the outer rubber layer, the prepreg reinforcing layer and the inner rubber layer of the air bag core mold are paved on the upper flap mold and the lower flap mold, the paving thicknesses of the upper flap mold and the lower flap mold are consistent, the layer losing design is noticed, and the equal thickness characteristic of the formed air bag core mold is guaranteed.
7. The method of making an airbag core mold as in claim 5, wherein: the curing process parameters are as follows: the temperature is 150-200 ℃, and the pressure is 0.5-0.65 Mpa.
8. A method of using the balloon mandrel of any of claims 1-4 wherein: and directly paving and pasting the composite material of the corresponding part of the inner cavity of the omega-shaped pipeline piece to be formed on the air bag core mold, then combining and packaging with the paving and pasting mold of the composite material of the other part, then sending the composite material into an autoclave for curing, demolding after curing is finished, taking out the air bag core mold in a vacuumizing mode, and reusing after returning to a furnace for shape correction.
9. The method of using a balloon mandrel as in claim 8 wherein: heating the formed omega-shaped pipeline to 60-80 ℃ during demoulding, sealing one end of the air bag core mould, and then vacuumizing to enable the air bag core mould to be taken out from the inner cavity of the omega-shaped pipeline after being contracted; the step of shape righting by furnace returning is that the taken out gasbag core mould is put back into the special forming mould and shape righting by furnace returning is carried out under the conditions that the temperature is 150 ℃ to 200 ℃ and the pressure is 0.5 MPa to 0.65MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211490688.7A CN115923197A (en) | 2022-11-25 | 2022-11-25 | Air bag core mold for forming variable-curvature variable-section large-thickness omega-shaped pipeline piece and manufacturing and using methods thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211490688.7A CN115923197A (en) | 2022-11-25 | 2022-11-25 | Air bag core mold for forming variable-curvature variable-section large-thickness omega-shaped pipeline piece and manufacturing and using methods thereof |
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| Publication Number | Publication Date |
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| CN115923197A true CN115923197A (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211490688.7A Pending CN115923197A (en) | 2022-11-25 | 2022-11-25 | Air bag core mold for forming variable-curvature variable-section large-thickness omega-shaped pipeline piece and manufacturing and using methods thereof |
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| CN (1) | CN115923197A (en) |
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- 2022-11-25 CN CN202211490688.7A patent/CN115923197A/en active Pending
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