CN107933050B - Method for accurately controlling angle of composite unidirectional laminated board - Google Patents
Method for accurately controlling angle of composite unidirectional laminated board Download PDFInfo
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- CN107933050B CN107933050B CN201711244250.XA CN201711244250A CN107933050B CN 107933050 B CN107933050 B CN 107933050B CN 201711244250 A CN201711244250 A CN 201711244250A CN 107933050 B CN107933050 B CN 107933050B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/08—Impregnating
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- Reinforced Plastic Materials (AREA)
- Sampling And Sample Adjustment (AREA)
- Moulding By Coating Moulds (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a method for accurately controlling the angle of a composite unidirectional laminated board, which comprises the following steps: step S100: cutting a material sheet of the prepreg, and tearing off the edge prepreg along the fiber direction of the prepreg to meet the condition that one side of the prepreg is 0 degree with the fiber direction; step S200: aligning each layer of prepreg with one side of the prepreg, which is 0 degree to the fiber direction, in sequence, assembling and sealing bags, and then carrying out hot pressing and curing to form a unidirectional laminated board; step S300: and confirming one side of the unidirectional laminated board with the prepreg and fiber direction of 0 degree, and cutting a strength test piece on the unidirectional laminated board along the side of the unidirectional laminated board with the prepreg and fiber direction of 0 degree. When the prepreg is laid, the included angle of 0 degree between the 0 degree of the prepreg and the edge direction of each layer in the composite material is 0 degree, and the 0 degree direction is marked in the process of manufacturing the unidirectional laminated board of the composite material, so that the cutting angle can not deviate, the strength test result is more accurate, and the judgment error can not occur.
Description
Technical Field
The invention relates to the technical field of composite material manufacturing processes, in particular to a method for accurately controlling the angle of a composite material unidirectional laminated board.
Background
The composite unidirectional laminate is generally manufactured synchronously with the production of composite parts and is used as a furnace piece test piece for strength tests. The strength test result of the furnace piece test piece is one of the criteria for evaluating the quality of the composite laminated plate part. The layering angles of the unidirectional laminated boards are all in the same direction, the unidirectional laminated boards are assembled and sealed after being paved in the same direction, and then the unidirectional laminated boards are cured and molded in an autoclave; after curing, a strength test piece is cut on the unidirectional laminate along the 0-degree fiber direction of the prepreg, and since the cutting angle has a great influence on the mechanical properties (such as interlayer stress and the like) of the strength test piece, the 0-degree direction of the prepreg of the unidirectional laminate must be confirmed before cutting. The 0-degree direction of the prepreg of the composite laminated plate is difficult to distinguish by a visual inspection method in the 0-degree direction, although the 0-degree direction and the 90-degree direction of the processing appearance of the laminated plate can be fixed by using a tool, the 0-degree direction of the laminated plate is marked, the marked 0-degree direction can be influenced by the processing appearance of the laminated plate, including allowance, peripheral barrier strip residue and the like, and can not directly correspond to the 0-degree direction of the prepreg, so that the angle deviation of a cut strength test sample can be caused, and the quality judgment of a composite part is influenced.
Disclosure of Invention
The invention aims to provide a method for accurately controlling the angle of a composite unidirectional laminated board, which is used for solving the problem that the strength test of the manufactured unidirectional laminated board is inaccurate because the 0-degree direction is difficult to confirm when the prepreg is laid in the prior art.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for accurately controlling the angle of a composite unidirectional laminate, comprising:
step S100: cutting a material sheet of the prepreg, and tearing off the edge prepreg along the fiber direction of the prepreg to meet the condition that one side of the prepreg is 0 degree with the fiber direction;
step S200: aligning each layer of prepreg with one side of the prepreg, which is 0 degree to the fiber direction, in sequence, assembling and sealing bags, and then carrying out hot pressing and curing to form a unidirectional laminated board;
step S300: and confirming one side of the unidirectional laminated board with the prepreg and fiber direction of 0 degree, and cutting a strength test piece on the unidirectional laminated board along the side of the unidirectional laminated board with the prepreg and fiber direction of 0 degree.
The working principle is as follows:
firstly, the sheet of the prepreg is cut, the fiber direction of the prepreg is conveniently checked, the edge prepreg is torn off along the fiber direction, one side of the edge prepreg is torn off, the angle between the torn side of the edge prepreg and the fiber direction is 0 degree, namely, after the edge prepreg is torn off, the boundary line of the side of the prepreg is parallel to the fiber direction. And determining the side with an included angle of 0 degrees with the fiber direction as the 0-degree direction of the prepreg, aligning each layer of material with the 0-degree direction of the prepreg one by one, assembling and bagging the sequentially laminated prepregs, and heating, curing and molding in an autoclave to form the one-way pressure measuring plate. The ply angle of the unidirectional laminated board of the composite material is the same direction, the unidirectional laminated board is cut along the 0-degree direction of the prepreg, the strength test piece is cut, because when the prepreg is laid, the 0-degree angle of the prepreg and the edge direction of each layer in the composite material form a 0-degree included angle, and the 0-degree direction is marked in the process of manufacturing the unidirectional laminated board of the composite material, therefore, the 0-degree direction of the unidirectional laminated board which is subjected to thermosetting molding can be conveniently confirmed, accurate cutting direction can be found out, deviation of the cut strength test piece angle can not occur, the strength test result is more accurate, and the error of quality judgment can not occur.
Further, the step S100 specifically includes:
step S110: cutting a sheet of the prepreg, tearing off a back lining of the edge prepreg, and tearing off the edge prepreg along the fiber direction;
step S120: the side of the web of prepreg where the edge prepreg was torn off was taken as the 0 ° direction.
The working principle is as follows:
when cutting out the tablet of preimpregnation material, at first need tear the back lining that glues on the tablet, then tear marginal preimpregnation material again, tear marginal preimpregnation material, the direction of remaining preimpregnation material is 0 contained angle with the fibre direction, tear one side that exposes behind the marginal preimpregnation material, be the reference direction when the picture layer of laying up combined material promptly, each layer of combined material is cut out the edge of preimpregnation material for and all aligns the laying up with this side after being 0 with the fibre direction promptly. Thus, the direction of the fibres in each layer is uniform in a single row of the laminate after thermosetting of the composite material.
Further, the step S200 specifically includes:
step S210: taking the prepreg and one side with the fiber direction of 0 degree as the 0 degree direction of the laying unidirectional laminated board;
step S220: fixing a guiding rule on one side of the prepreg, which is at an angle of 0 degrees with the fiber direction;
step S230: sequentially enabling the prepreg to tightly cling to one side of the prepreg without gaps;
step S240: repeating the step S230, sequentially laying each layer of prepreg until the last but one layer of prepreg and the last but one layer of prepreg enter the next step;
step S250: and (3) sandwiching an airtight material in the last two layers of prepregs, marking the direction with the included angle of the fiber direction of 0 degree in advance, and thermally curing to form the unidirectional laminated board.
The working principle is as follows:
before each layer of the composite material is laminated, the 0-degree direction needs to be determined firstly to serve as a reference direction for laying each layer, after the reference direction is determined, the guiding rule is fixed in the reference direction, and the layer to be laid and the guiding rule are conveniently and closely attached without gaps, so that direction deviation cannot occur in the laying of each layer, after the front layers are sequentially laid, and when the prepreg of the last two layers of the composite materials is left, the last two layers of the prepreg are wrapped with the airtight materials in a clamping mode and used for marking the 0-degree direction in advance, and after the prepreg is heated and formed, the two layers of the composite materials are conveniently separated so as to cut out the strength test sample.
Further, the step S300 specifically includes:
step S310: confirming the 0 ° orientation from the pre-marked air impermeable material in the unidirectional laminate;
step S320: tearing off the edge of the prepreg along the 0-degree direction of the prepreg, and exposing the 0-degree direction of the unidirectional laminated board;
step S330: separating the two layers of cured prepreg along the edge part, and tearing one side of the prepreg at an angle of 0 degree to the fiber direction;
step S340: a 0 ° direction inspection step of aligning the one side direction at 0 ° to the fiber direction in the step S330 as a longitudinal direction with the processing feed direction;
step S350: a strength test piece for strength test was cut out.
The working principle is as follows:
for the unidirectional laminated board after heating forming, finding out an airtight material marked in a 0-degree direction in advance, tearing off the edge of the prepreg, displaying the 0-degree direction marked in advance, separating the cured prepreg along the 0-degree direction marked in advance, tearing off the airtight material, tearing off one side of the airtight material, namely the side with the fiber direction being 0 degrees, preparing cutting, aligning the confirmed 0-degree direction as the length direction with the processing feed direction, cutting the unidirectional laminated board made of the composite material to obtain a strength test piece, wherein the fiber directions of all layers of materials of the strength test piece are consistent, and therefore, the test result of the strength test piece is more accurate.
Further, the air-impermeable material is a plastic film.
The working principle is as follows:
the airtight material adopts high temperature resistant plastic film, presss from both sides to wrap up between the last two-layer shop layer, and the distance apart from the edge of shop layer is certain, not all presss from both sides to wrap up plastic film between all areas of contact, when to the composite bed thermosetting molding, can not suffer destruction, consequently the place of wrapping up plastic film is pressed from both sides, and last two-layer composite bed can not become an organic whole, the separation of the two-layer of consequently being convenient for, and other places of contact, solidify as an organic whole. Therefore, after the plastic film is torn off and the edges of the prepreg are cut, the other parts are the integral composite material formed by laying and thermosetting in the same direction.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) according to the invention, when the prepreg is laid, the included angle of 0 degree is formed between the 0 degree of the prepreg and the edge direction of each layer in the composite material, and the 0 degree direction is marked in the process of manufacturing the unidirectional laminated board of the composite material, so that the 0 degree direction of the unidirectional laminated board which is subjected to thermosetting molding can be conveniently confirmed, the accurate cutting direction can be found, the angle of the cut strength test sample cannot deviate, the strength test result is more accurate, and the error of quality judgment cannot occur.
(2) A layer of air-proof material is sandwiched between the edges of the last two layers of prepregs for a pre-marking step in the direction of 0 degrees, and the two layers of prepregs are isolated so that the prepreg can be torn out in the direction of 0 degrees along the fiber after being cured;
(3) determining a positioning reference during the laying operation by using a guiding rule, and aligning and calibrating each layer of fibers at 0 degree; under the premise of automatic blanking, the fiber direction of 0 degree is torn out along the fiber direction of the prepreg, and the correctness of the material sheet in the direction of 0 degree is further ensured.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1:
a method for accurately controlling the angle of a composite unidirectional laminate, comprising:
step S100: cutting a material sheet of the prepreg, and tearing off the edge prepreg along the fiber direction of the prepreg to meet the condition that one side of the prepreg is 0 degree with the fiber direction;
step S200: aligning each layer of prepreg with one side of the prepreg, which is 0 degree to the fiber direction, in sequence, assembling and sealing bags, and then carrying out hot pressing and curing to form a unidirectional laminated board;
step S300: and confirming one side of the unidirectional laminated board with the prepreg and fiber direction of 0 degree, and cutting a strength test piece on the unidirectional laminated board along the side of the unidirectional laminated board with the prepreg and fiber direction of 0 degree.
The working principle is as follows:
firstly, the sheet of the prepreg is cut, the fiber direction of the prepreg is conveniently checked, the edge prepreg is torn off along the fiber direction, one side of the edge prepreg is torn off, the angle between the torn side of the edge prepreg and the fiber direction is 0 degree, namely, after the edge prepreg is torn off, the boundary line of the side of the prepreg is parallel to the fiber direction. And determining the side with an included angle of 0 degrees with the fiber direction as the 0-degree direction of the prepreg, aligning each layer of material with the 0-degree direction of the prepreg one by one, assembling and bagging the sequentially laminated prepregs, and heating, curing and molding in an autoclave to form the one-way pressure measuring plate. The ply angle of the unidirectional laminated board of the composite material is the same direction, the unidirectional laminated board is cut along the 0-degree direction of the prepreg, the strength test piece is cut, because when the prepreg is laid, the 0-degree angle of the prepreg and the edge direction of each layer in the composite material form a 0-degree included angle, and the 0-degree direction is marked in the process of manufacturing the unidirectional laminated board of the composite material, therefore, the 0-degree direction of the unidirectional laminated board which is subjected to thermosetting molding can be conveniently confirmed, accurate cutting direction can be found out, deviation of the cut strength test piece angle can not occur, the strength test result is more accurate, and the error of quality judgment can not occur.
Example 2:
on the basis of embodiment 1, the step S100 specifically includes:
step S110: cutting a sheet of the prepreg, tearing off a back lining of the edge prepreg, and tearing off the edge prepreg along the fiber direction;
step S120: the side of the web of prepreg where the edge prepreg was torn off was taken as the 0 ° direction.
The working principle is as follows:
when cutting out the tablet of preimpregnation material, at first need tear the back lining that glues on the tablet, then tear marginal preimpregnation material again, tear marginal preimpregnation material, the direction of remaining preimpregnation material is 0 contained angle with the fibre direction, tear one side that exposes behind the marginal preimpregnation material, be the reference direction when the picture layer of laying up combined material promptly, each layer of combined material is cut out the edge of preimpregnation material for and all aligns the laying up with this side after being 0 with the fibre direction promptly. Thus, the direction of the fibres in each layer is uniform in a single row of the laminate after thermosetting of the composite material.
Example 3:
on the basis of embodiment 2, the step S200 specifically includes:
step S210: taking the prepreg and one side with the fiber direction of 0 degree as the 0 degree direction of the laying unidirectional laminated board;
step S220: fixing a guiding rule on one side of the prepreg, which is at an angle of 0 degrees with the fiber direction;
step S230: sequentially enabling the prepreg to tightly cling to one side of the prepreg without gaps;
step S240: repeating the step S230, sequentially laying each layer of prepreg until the last but one layer of prepreg and the last but one layer of prepreg enter the next step;
step S250: and (3) sandwiching an airtight material in the last two layers of prepregs, marking the direction with the included angle of the fiber direction of 0 degree in advance, and thermally curing to form the unidirectional laminated board.
The working principle is as follows:
before each layer of the composite material is laminated, the 0-degree direction needs to be determined firstly to serve as a reference direction for laying each layer, after the reference direction is determined, the guiding rule is fixed in the reference direction, and the layer to be laid and the guiding rule are conveniently and closely attached without gaps, so that direction deviation cannot occur in the laying of each layer, after the front layers are sequentially laid, and when the prepreg of the last two layers of the composite materials is left, the last two layers of the prepreg are wrapped with the airtight materials in a clamping mode and used for marking the 0-degree direction in advance, and after the prepreg is heated and formed, the two layers of the composite materials are conveniently separated so as to cut out the strength test sample.
Example 4:
on the basis of embodiment 3, the step S300 specifically includes:
step S310: confirming the 0 ° orientation from the pre-marked air impermeable material in the unidirectional laminate;
step S320: tearing off the edge of the prepreg along the 0-degree direction of the prepreg, and exposing the 0-degree direction of the unidirectional laminated board;
step S330: separating the two layers of cured prepreg along the edge part, and tearing one side of the prepreg at an angle of 0 degree to the fiber direction;
step S340: a 0 ° direction inspection step of aligning the one side direction at 0 ° to the fiber direction in the step S330 as a longitudinal direction with the processing feed direction;
step S350: a strength test piece for strength test was cut out.
The working principle is as follows:
for the unidirectional laminated board after heating forming, finding out an airtight material marked in a 0-degree direction in advance, tearing off the edge of the prepreg, displaying the 0-degree direction marked in advance, separating the cured prepreg along the 0-degree direction marked in advance, tearing off the airtight material, tearing off one side of the airtight material, namely the side with the fiber direction being 0 degrees, preparing cutting, aligning the confirmed 0-degree direction as the length direction with the processing feed direction, cutting the unidirectional laminated board made of the composite material to obtain a strength test piece, wherein the fiber directions of all layers of materials of the strength test piece are consistent, and therefore, the test result of the strength test piece is more accurate.
Further, the air-impermeable material is a plastic film.
The working principle is as follows:
the airtight material adopts high temperature resistant plastic film, presss from both sides to wrap up between the last two-layer shop layer, and the distance apart from the edge of shop layer is certain, not all presss from both sides to wrap up plastic film between all areas of contact, when to the composite bed thermosetting molding, can not suffer destruction, consequently the place of wrapping up plastic film is pressed from both sides, and last two-layer composite bed can not become an organic whole, the separation of the two-layer of consequently being convenient for, and other places of contact, solidify as an organic whole. Therefore, after the plastic film is torn off and the edges of the prepreg are cut, the other parts are the integral composite material formed by laying and thermosetting in the same direction.
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 (3)
1. A method for accurately controlling the angle of a composite unidirectional laminate is characterized by comprising the following steps:
step S100: cutting a material sheet of the prepreg, and tearing off the edge prepreg along the fiber direction of the prepreg to meet the condition that one side of the prepreg is 0 degree with the fiber direction;
the step S100 specifically includes:
step S110: cutting a sheet of the prepreg, tearing off a back lining of the edge prepreg, and tearing off the edge prepreg along the fiber direction;
step S120: taking one side of the prepreg, from which the edge of the prepreg is torn, on the material sheet of the prepreg as a 0-degree direction;
step S200: aligning each layer of prepreg with one side of the prepreg, which is 0 degree to the fiber direction, in sequence, assembling and sealing bags, and then carrying out hot pressing and curing to form a unidirectional laminated board;
the step S200 specifically includes:
step S210: taking the prepreg and one side with the fiber direction of 0 degree as the 0 degree direction of the laying unidirectional laminated board;
step S220: fixing a guiding rule on one side of the prepreg, which is at an angle of 0 degrees with the fiber direction;
step S230: sequentially enabling the prepreg to tightly cling to one side of the prepreg without gaps;
step S240: repeating the step S230, sequentially laying each layer of prepreg until the last but one layer of prepreg and the last but one layer of prepreg enter the next step;
step S250: air-proof materials are wrapped in the last two layers of prepreg in a clamping mode, the direction with the included angle of the fiber direction of 0 degree is marked in advance, and the prepreg is thermally cured into a unidirectional laminated board;
step S300: and confirming one side of the unidirectional laminated board with the prepreg and fiber direction of 0 degree, and cutting a strength test piece on the unidirectional laminated board along the side of the unidirectional laminated board with the prepreg and fiber direction of 0 degree.
2. The method for precisely controlling the angle of a unidirectional laminate of composite material according to claim 1, wherein the step S300 specifically comprises:
step S310: confirming the 0 ° orientation from the pre-marked air impermeable material in the unidirectional laminate;
step S320: tearing off the edge of the prepreg along the 0-degree direction of the prepreg, and exposing the 0-degree direction of the unidirectional laminated board;
step S330: separating the two layers of cured prepreg along the edge part, and tearing one side of the prepreg at an angle of 0 degree to the fiber direction;
step S340: a 0 ° direction inspection step of aligning the one side direction at 0 ° to the fiber direction in the step S330 as a longitudinal direction with the processing feed direction;
step S350: a strength test piece for strength test was cut out.
3. A method for the precise control of the angle of a unidirectional laminate of composite material according to claim 2, wherein the gas impermeable material is a plastic film.
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Application publication date: 20180420 Assignee: SICHUAN XIN WAN XING CARBON FIBER COMPOSITES Co.,Ltd. Assignor: CHENGDU AIRCRAFT INDUSTRIAL (GROUP) Co.,Ltd. Contract record no.: X2023980040223 Denomination of invention: A Precise Angle Control Method for Unidirectional Composite Laminates Granted publication date: 20200417 License type: Common License Record date: 20230828 |