CN111923439B - Manufacturing method of L-shaped edge composite material part - Google Patents
Manufacturing method of L-shaped edge composite material part Download PDFInfo
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- CN111923439B CN111923439B CN202010575116.3A CN202010575116A CN111923439B CN 111923439 B CN111923439 B CN 111923439B CN 202010575116 A CN202010575116 A CN 202010575116A CN 111923439 B CN111923439 B CN 111923439B
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- equipment
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- demolding
- shaped edge
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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
- B29C70/342—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 isostatic pressure
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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
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3076—Aircrafts
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a manufacturing method of an L-shaped seamed edge composite material part, which comprises an equipment main body, wherein an equipment groove area is arranged on the equipment main body; and (3) arranging demolding cloth in the groove area, removing gas micromolecules generated in the blank hot-press molding process from the upper surface of a workpiece, and demolding by blowing off or adsorbing with compressed air. According to the invention, the manufacturing precision of the L-shaped edge composite material part is effectively improved by laying the demolding cloth.
Description
Technical Field
The invention belongs to the technical field of manufacturing processes of L-shaped edge composite materials, and particularly relates to a manufacturing method of an L-shaped edge composite material part.
Background
The composite material is widely applied to the field of aviation, and the dosage proportion of the composite material is an important index for measuring the advancement of an airplane. Most of composite material parts are flat plate type, U type, S type, V type and the like, the curvature of a sharp part is usually subjected to smooth treatment, an L-shaped edge is prepared by post-processing cutting and polishing, and no autoclave forming method for one-step forming of the L-shaped edge composite material parts is reported before.
The L-shaped edges are generally used for butt joint, matching and the like between composite materials, and the edge edges of most composite materials are L-shaped edges. The L-shaped edge is generally obtained by mechanical processing (such as cutting), and the method is easy to cause the defects of layering, cracking, burrs, section pits and the like on a composite product, particularly the edge position, and seriously influences the processing precision of the composite product; easily generates the properties of mechanical property damage such as overburning and the like, corrosion resistance and the like. Therefore, the method for preparing the L-shaped edge composite material part is obtained, and the problem that the performance of the part is reduced due to post-processing is particularly important to be avoided.
The conventional preparation method of the L-shaped edge composite material product is a resin transfer molding method, and the preparation method of controlling the overall dimension by depending on a mold has the advantages of high product precision, high surface quality and the like, and ensures that the L-shaped edge is obtained under the condition that the L-shaped edge is not suitable for machining; but the mold design is complex, the cost is high and the process applicability is narrow (the applicable resin system is few). The method is developed into combined mold autoclave molding in the field of prepreg composite material preparation, is mostly used for large-sized workpieces with special functions such as integrity requirement and the like, and is high in molding cost for small and medium-sized workpieces.
Disclosure of Invention
The invention aims to provide a method for manufacturing an L-shaped edge composite material part, wherein the laying effect of release cloth has great influence on the L-shaped edge forming result, and the precision of the L-shaped edge composite material part can be effectively improved.
The invention is mainly realized by the following technical scheme: a manufacturing method of an L-shaped seamed edge composite material part comprises an equipment main body, wherein an equipment groove area is arranged on the equipment main body; and (3) arranging demolding cloth in the groove area, removing gas micromolecules generated in the blank hot-press molding process from the upper surface of a workpiece, and demolding by blowing off or adsorbing with compressed air.
In order to better implement the invention, the method mainly comprises the following steps:
step S100: arranging demolding cloth in the glue flowing area, and compacting the demolding cloth at the edge to enable the demolding cloth to be completely attached to the surface of the equipment to form an edge angle; the construction area of the demoulding cloth is at least 20mm larger than the allowance area of the part;
step S200: sequentially laying a strippable layer, an isolating film and a breathable material layer in the equipment groove area;
step S300: and placing thermocouples on the strippable layer and the edge of the part, bagging and carrying out hot-pressing curing.
In order to better realize the invention, the size of the material sheet is smaller than or equal to the size of the groove area of the device when the blank is laid.
In order to better implement the invention, further, in step S200, an air guide material is attached to the blank margin region at L near the vacuum bag for the double L-shaped workpiece, so as to avoid that the tool L region is too thick.
In order to better realize the invention, further, in the process of adsorption demoulding, the demoulding direction of the L-shaped edge is consistent with the direction of applying adsorption force, a part is separated from equipment under the action of the adsorption force, and the edge is prevented from being cracked.
In order to better realize the invention, further, the integral adsorption demoulding is adopted; or one end of the workpiece is adsorbed, so that part of the workpiece is separated from the equipment, and then the demoulding is finished under the action of blowing or auxiliary prying force.
The invention has the beneficial effects that:
(1) the method is suitable for manufacturing the L-shaped edge composite material part with a special thickened area requirement on one surface of the part and difficult to machine by using mechanical processing, has simple process equipment, can replace a combined mold to manufacture the composite material part with high precision, reduces the damage, the environmental pollution and the like caused by cutting, and is a more economical, effective and widely applicable preparation method of the L-shaped edge composite material part.
(2) The precision of the L-shaped edge composite material part is high, and the inaccuracy of the appearance of the part caused by cutting tolerance is effectively reduced; the L-shaped edge composite material part has reliable quality, and effectively avoids the defects of layering and the like caused by machining the edge: the manufacturing efficiency of the L-shaped seamed edge composite material part is high, the part is formed in place at one time, and post-processing is not needed.
Drawings
FIG. 1 is a schematic structural view of an equipment body;
FIG. 2 is an assembly view of an L-shaped edge composite part;
FIG. 3 is a schematic diagram of adsorption stripping.
Wherein: 1-equipment main body, 2-equipment groove area, 3-demoulding cloth, 4-strippable layer, 5-isolation film, 6-breathable material layer, 7-vacuum bag and 8-double L-shaped edge angle.
Detailed Description
Example 1:
a manufacturing method of an L-shaped edge composite material part mainly comprises the following steps:
1. the demoulding cloth 3 is constructed in the groove area 2 of the equipment and the area where the glue flow is possibly generated, and particularly the demoulding cloth 3 needs to be compacted at the edge and completely attached to the surface of the equipment to form an edge angle. The construction area of the demoulding cloth 3 is at least 20mm larger than the allowance area of the part.
2. And laying blanks according to the size and thickness of the workpiece, paying attention to the matching of the size of the material sheet and the groove area when laying the blanks, wherein the material sheet size cannot be larger than the groove area, and the blanks can be manufactured according to the negative tolerance difference of the workpiece (slightly smaller than the width of the groove area). The thickness of the L-shaped edge of the workpiece is consistent with the thickness of the equipment, the position of the upper surface of the workpiece is determined by the laying layer, and the workpiece is formed by the vacuum bag 7.
3. Placing an auxiliary material strippable layer 4, an isolating membrane 5 and a breathable material layer 6 according to the following requirements and sequence; particularly, for the preparation of the double-L-shaped part in fig. 2, an air guide material needs to be adhered to the blank allowance region of the equipment at the L position close to the vacuum bag 7, so that the phenomenon that the area of the adhering tool L is too thick, and bubbles are difficult to discharge under the condition that the area is closed, and the surface quality is poor is avoided. As shown in fig. 2, the tool is correspondingly provided with double L-shaped edges 8.
4. Placing a thermocouple at the edge of the part on the strippable layer 4, bagging and carrying out hot-pressing solidification;
5. the special mode is used for demoulding treatment, adsorption demoulding is excellent, and damage to the L-shaped edge of a finished piece caused by direct prying can be greatly avoided. As shown in fig. 3, the key of the adsorption demolding is that the demolding direction of the L-shaped edge is consistent with the direction of the applied adsorption force (the application of the adsorption force can be realized by manual mechanical force application or vacuum adsorption), and the L-shaped edge is drawn out under the action of the adsorption force to separate a part from equipment, so that the edge is prevented from being broken. And selecting proper suckers, wherein the size, the number and the positions of the suckers are selected according to the shape of the workpiece, the weight of the workpiece and the binding force between the workpiece and equipment. The demoulding device can be integrally adsorbed and demoulded, and also can be adsorbed at one end of a workpiece, so that the part of the workpiece is separated from equipment, and the demoulding can be smoothly finished under the action of blowing or auxiliary prying force.
As shown in fig. 1, the cavity formed by the equipment groove area 2, the equipment main body 1 and the workpiece pocket attaching surface of the tool sinking can embody the feature of the part. The equipment groove area 2, the seamed edge and the equipment main body 1 ensure the L-shaped seamed edge of the workpiece pasting tool surface.
The thickness of the L-shaped edge composite material part is consistent with the thickness of the equipment, and in the blank hot press molding process, generated gas micromolecules are removed from the upper surface of the part. The laying effect of the release fabric 3 has a great influence on the L-shaped edge forming result. The demolding mode can use a method of blowing off by compressed air or adsorbing and demolding.
The precision of the L-shaped edge composite material part is high, and the inaccuracy of the appearance of the part caused by cutting tolerance is effectively reduced; the L-shaped edge composite material part has reliable quality, and effectively avoids the defects of layering and the like caused by machining the edge: the manufacturing efficiency of the L-shaped seamed edge composite material part is high, the part is formed in place at one time, and post-processing is not needed.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (5)
1. The manufacturing method of the L-shaped edge composite material part is characterized by comprising an equipment main body (1), wherein an equipment groove area (2) is arranged on the equipment main body (1); arranging a demoulding cloth (3) in the groove area (2), removing gas micromolecules generated in the blank hot-press forming process from the upper surface of a workpiece, and adopting compressed air to blow off or adsorb for demoulding; the method comprises the following steps:
step S100: arranging a demolding cloth (3) in the glue flowing area, and compacting the demolding cloth (3) at the edge to ensure that the demolding cloth (3) is completely attached to the surface of the equipment to form an edge angle; the construction area of the demoulding cloth (3) is at least 20mm larger than the allowance area of the part;
step S200: sequentially laying a strippable layer (4), an isolating film (5) and a breathable material layer (6) in the equipment groove area (2);
step S300: and placing thermocouples on the strippable layer (4) and the edge position of the part, bagging and carrying out hot-pressing curing.
2. A method of making an L-edge composite product as claimed in claim 1 wherein the web size is less than or equal to the size of the relief area (2) when the blank is laid.
3. The method for manufacturing an L-shaped edge composite workpiece as claimed in claim 1, wherein in step S200, an air guide material is attached to a blank margin region at L near the vacuum bag (7) for the double L-shaped workpiece, so as to avoid the tool L region being too thick.
4. The method for manufacturing the L-shaped edge composite material part as claimed in any one of claims 1 to 3, wherein in the adsorption demolding process, the demolding direction of the L-shaped edge is consistent with the direction of the applied adsorption force, and the part is separated from the equipment under the action of the adsorption force, so that the edge is prevented from being cracked.
5. The method of making an L-shaped edge composite article of claim 4 wherein the demolding is performed by bulk adsorption; or one end of the workpiece is adsorbed, so that part of the workpiece is separated from the equipment, and then the demoulding is finished under the action of blowing or auxiliary prying force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010575116.3A CN111923439B (en) | 2020-06-22 | 2020-06-22 | Manufacturing method of L-shaped edge composite material part |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010575116.3A CN111923439B (en) | 2020-06-22 | 2020-06-22 | Manufacturing method of L-shaped edge composite material part |
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| Publication Number | Publication Date |
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| CN111923439A CN111923439A (en) | 2020-11-13 |
| CN111923439B true CN111923439B (en) | 2021-10-08 |
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| CN202010575116.3A Active CN111923439B (en) | 2020-06-22 | 2020-06-22 | Manufacturing method of L-shaped edge composite material part |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2616359Y (en) * | 2003-03-14 | 2004-05-19 | 自山林实业有限公司 | Vacuum ejecting device for plastic shaping machine |
| CN101412287A (en) * | 2008-12-02 | 2009-04-22 | 东华大学 | Vacuum leading-in method with pressure transmission module |
| DE102011079945A1 (en) * | 2011-07-27 | 2013-01-31 | Airbus Operations Gmbh | Device for producing an adhesive component with fiber composite plastic and method |
| CN105729830B (en) * | 2016-04-06 | 2018-04-10 | 中航复合材料有限责任公司 | A kind of U-shaped unit Material Stiffened Panel autoclave integral forming method of no core |
| CN108000896B (en) * | 2017-12-01 | 2019-11-12 | 湖南大学 | A kind of curing molding method of L-type plate class composite product |
| CN108928017A (en) * | 2018-06-21 | 2018-12-04 | 江西昌河航空工业有限公司 | A kind of curing method in composite material special type face |
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