CN114919208A - Molding apparatus and molding method - Google Patents
Molding apparatus and molding method Download PDFInfo
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- CN114919208A CN114919208A CN202210332211.XA CN202210332211A CN114919208A CN 114919208 A CN114919208 A CN 114919208A CN 202210332211 A CN202210332211 A CN 202210332211A CN 114919208 A CN114919208 A CN 114919208A
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- mold core
- sheet
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- molding
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- 238000000465 moulding Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000003825 pressing Methods 0.000 claims description 35
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 12
- 239000004917 carbon fiber Substances 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 12
- 238000004049 embossing Methods 0.000 claims description 8
- 229920001169 thermoplastic Polymers 0.000 claims description 6
- 239000004416 thermosoftening plastic Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000000741 silica gel Substances 0.000 claims description 5
- 229910002027 silica gel Inorganic materials 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 3
- 230000009477 glass transition Effects 0.000 claims description 3
- 229920001187 thermosetting polymer Polymers 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000007723 die pressing method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 11
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007721 mold pressing method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
Classifications
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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
- B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/30—Mounting, exchanging or centering
- B29C33/306—Exchangeable mould parts, e.g. cassette moulds, mould inserts
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a molding device and a molding method, wherein the molding device comprises: a front mold core and a rear mold core; wherein, a special-shaped elastic mold core is limited in the front mold core, and a cavity matched with the shape of the elastic mold core is arranged in the rear mold core; the sheet to be processed is placed on the rear mold core, and the molding of the sheet to be processed is completed through the matching of the elastic mold core and the mold cavity. The invention can realize the die pressing of special-shaped products, and the products are evenly stressed and have high forming quality.
Description
Technical Field
The invention relates to the technical field of mould pressing, in particular to a mould pressing device and a mould pressing method.
Background
In the existing carbon fiber mould pressing process, most of the mould materials are steel moulds, and aiming at the forms of flat plate products, the steel moulds can effectively transfer the pressure of a cavity and the appearance performance of the products is better; however, when the product is in a non-flat plate structure such as a "U" shape, the steel die is adopted to cause that the U-shaped side wall cannot effectively transmit pressure, and the pressures of the front surface and the side wall are also inconsistent, which causes the bad phenomena of high product porosity, poor mechanical properties, appearance difference and the like.
Therefore, a molding technique capable of realizing high-quality injection molding of non-flat plate type products is highly required.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a molding device and a molding method to solve the problems of uneven stress and poor molding quality of products caused by the fact that the existing molding process is not suitable for products with non-flat plate structures.
The invention provides a molding device, comprising: a front mold core and a rear mold core; wherein, a special-shaped elastic mold core is limited in the front mold core, and a cavity matched with the shape of the elastic mold core is arranged in the rear mold core; and the sheet to be processed is placed on the rear mold core, and the molding of the sheet to be processed is completed through the matching of the elastic mold core and the mold cavity.
In addition, the optional technical scheme is that a fixed bottom plate is arranged on one side of the front mold core, which is far away from the rear mold core; wherein, the front mould core is fixed on the fixed bottom plate through a fastening bolt.
In addition, the optional technical scheme is that a step-shaped limiting clamping groove is arranged in the front mold core; the elastic mold core is provided with a limiting table matched with the limiting clamping groove, and the limiting table is clamped in the limiting clamping groove.
In addition, the optional technical scheme is that in a die assembly state, the limiting clamping groove, the fixed bottom plate and the die cavity are matched to form a limiting space for limiting the elastic die core.
In addition, the selectable technical scheme is that the shape of the cavity is U-shaped, trapezoidal or arc-shaped.
In addition, the optional technical scheme is that the elastic mold core is a silica gel piece, and the rear mold core is a rigid piece.
In addition, the selectable technical scheme is that the Shore hardness range of the elastic mold core is 50-70A.
In addition, the optional technical scheme is that the sheet to be treated is thermosetting carbon fiber or thermoplastic carbon fiber.
In addition, an optional technical scheme is that in the mold opening state, the volume of the elastic mold core is larger than that of the mold cavity.
On the other hand, the invention also provides a mould pressing method, which adopts the mould pressing device to carry out mould pressing operation and comprises the following steps: cutting the sheet to be processed to a preset shape and size based on die cutting or CNC; placing a sheet to be processed with a preset shape and size on a rear mold core of a mold pressing device; the front mold core of the control and pressing device moves downwards, and the sheet to be processed is extruded through the matched molds of the elastic mold core and the rear mold core in the front mold core; and controlling a pressing device to open the die and taking out the deformed sheet.
In addition, the optional technical proposal is that in the mold closing process of the mold pressing device, the method also comprises a stage of curing control on the deformed sheet; wherein the curing control conditions are as follows: the temperature is 130-160 ℃, the mould pressing time is 3-5 minutes, and the pressure is 5-7 Mpa.
In addition, an optional technical solution is that: after cutting a thermoplastic carbon fiber plate to-be-processed sheet material to a preset shape and size based on die cutting or CNC, heating and softening the to-be-processed sheet material to a glass transition temperature point; and cooling the deformed sheet to a preset temperature before the die opening of the die pressing device is controlled.
By utilizing the mould pressing device and the mould pressing method, the special-shaped elastic mould core is arranged in the front mould core, the cavity matched with the shape of the elastic mould core is arranged in the rear mould core, and after the sheet to be processed is placed on the rear mould core, the mould pressing of the sheet to be processed can be completed through the matching of the elastic mould core and the cavity, so that the stress range of the sheet is uniform, the porosity is low, the mould pressing process is simple, and the mould pressing device and the mould pressing method can be suitable for the sheet processing process of various materials and realize the high-quality mould pressing operation of non-plate products.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and readily appreciated by reference to the following description taken in conjunction with the accompanying drawings, and as the invention becomes more fully understood. In the drawings:
FIG. 1 is a schematic view of the mold opening state of a molding apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic view showing a mold clamping state of the molding device according to the embodiment of the present invention;
FIG. 3 is a force profile of a sheet to be processed according to an embodiment of the invention;
FIG. 4 is a flow chart of an embossing method according to an embodiment of the present invention.
Wherein the reference numerals include: the processing device comprises a fixed bottom plate 1, a fastening bolt 2, a front mold core 3, a limiting clamping groove 31, an elastic mold core 4, a limiting table 41, a rear mold core 5, a cavity 51 and a sheet 6 to be processed.
The same reference numbers in all figures indicate similar or corresponding features or functions.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
For a detailed description of the molding apparatus of the present invention, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 and 2 show schematic configurations of a molding apparatus according to an embodiment of the present invention in an open-mold state and a closed-mold state, respectively; fig. 3 shows a force distribution diagram of a sheet to be processed.
As shown in fig. 1 to 3, the molding apparatus according to the embodiment of the present invention includes a front mold core 3 and a rear mold core 5; wherein, a special-shaped elastic mold core 4 is limited in the front mold core 3, and a cavity 51 matched with the shape of the elastic mold core 4 is arranged in the rear mold core 5; the sheet 6 to be processed is placed on the rear mold core 5, the mold pressing of the sheet 6 to be processed is completed through the matching of the elastic mold core 4 and the mold cavity 51, the shapes of the mold cavity 51 and the elastic mold core 4 can be flexibly set according to the shape requirement of the sheet 6 to be processed in the specific application process, and as the elastic mold core 4 has a certain deformation amount, the uniform pressure can be applied to each position of the sheet, so that the quality of the formed product is ensured.
In order to facilitate the positioning and replacement of the elastic mold core 4, a fixed bottom plate 1 can be arranged on one side of the front mold core 3 away from the rear mold core 5; wherein, front mould benevolence 3 accessible a plurality of fastening bolt 2 fix on fixed baseplate 1, and flexible mould benevolence is spacing between fixed baseplate 1 and front mould benevolence 3, can install and change flexible mould benevolence in a flexible way through fastening bolt 2, improves molding device's application scope.
In one embodiment of the present invention, a stepped limiting slot 31 may be disposed in the front mold core 3; the elastic mold core 4 is provided with a limiting table 41 matched with the limiting clamping groove 31, and the limiting table 41 is clamped in the limiting clamping groove 31, so that the positioning operation of the flexible mold core is realized.
In the mold opening state, namely in the opening state of the front mold core 3 and the rear mold core 5, the elastic mold core 4 is limited in the front mold core 3, in the mold closing state, namely in the pressing state of the front mold core 3 and the rear mold core 5 on the sheet 6 to be processed, the limiting clamping groove 31, the fixed bottom plate 1 and the cavity 51 are matched to form a limiting space for limiting the elastic mold core 4, and the sheet at the moment forms a preset shape through the matching of the elastic mold core 4 and the cavity 51.
The shape of the cavity 51 and the shape of the elastic core 4 can be flexibly set according to the requirements for processing and forming the sheet, and for example, the shape can be set to various non-plate shapes such as a U shape, a trapezoid shape, or an arc shape.
In an embodiment of the present invention, the elastic mold core 4 may be a silica gel member, which can generate a large deformation under the action of an external force and has good high temperature resistance and aging resistance, and the rear mold core 5 is made of steel material to complete the shaping of the sheet.
In the die closing process, the elastic die core 4 made of silica gel can generate large extrusion deformation, the inner side wall of the die cavity 51 can have uniform pressure, and the Shore hardness range of the elastic die core 4 can be set to be 50-70A in order to ensure sufficient die cavity pressure.
It is understood that the sheet material 6 to be treated according to the present invention may be a sheet material of thermosetting carbon fiber or thermoplastic carbon fiber or the like, and the specific molding conditions may be set as follows: the temperature is 130-160 deg.C, and the specific temperature can be 130 deg.C, 135 deg.C, 140 deg.C, 145 deg.C, and 150 deg.C. The mould pressing time is 3-5 minutes, the specific mould pressing time can be 3 minutes, 3.5 minutes, 4 minutes, 4.5 minutes and 5 minutes, the pressure is 5-7 Mpa, the specific pressure can be 5Mpa, 5.5Mpa, 6Mpa, 6.5Mpa and 7Mpa, and the product formed under the conditions has remarkable improvement in the aspects of size, appearance gloss, porosity and the like.
In addition, in order to ensure that the elastic mold core 4 can uniformly apply pressure to the sheet, in the open-die state, the volume of the elastic mold core 4 can be set to be slightly larger than the volume of the cavity, that is, in the open-die state, the volume of the elastic mold core 4 is ensured to be larger than the volume of the cavity; however, in the closed position, the elastic mold core 4 can project into the mold cavity, ensuring that it can provide sufficient deformation pressure to the sheet.
The invention also provides a molding method corresponding to the molding device, and particularly, a schematic flow of the molding method is shown in FIG. 4 according to the embodiment of the invention.
As shown in fig. 4, the molding method of the embodiment of the invention for performing the molding operation by using the molding device mainly comprises the following steps:
s110: and cutting the sheet to be processed to a preset shape size based on die cutting or CNC.
Before the molding treatment, the sheet to be treated needs to be primarily processed, for example, by die cutting, CNC or other methods, so as to be processed into a specified shape and size, and the sheet can be flexibly set according to the structural requirements of the product.
S120: and placing the sheet to be processed with the preset shape and size on a rear mold core of the mold pressing device.
S130: the front mold core of the control and pressing device moves downwards, and the sheet to be processed is extruded through the matched die of the elastic mold core and the rear mold core in the front mold core.
Wherein, at the compound die in-process, the elastic mold core can take place extrusion deformation through the compound die power, because it produces volume deformation, can produce even pressure on the die cavity surface, realizes the even extrusion deformation to the sheet.
S140: and controlling a pressing device to open the die and taking out the deformed sheet.
Taking the thermally fixed carbon fiber as an example, the method further includes a step of performing curing control on the deformed sheet material during the mold closing process of the mold pressing device; wherein, the curing control conditions can be as follows: the temperature is 130-160 ℃, the mould pressing time is 3-5 minutes, and the pressure is 5-7 Mpa.
In addition, if the sheet to be processed is thermoplastic carbon fiber, because the inherent property of the material does not need to be solidified, in the die pressing process, after the sheet to be processed is cut to the preset shape and size based on die cutting or CNC, the sheet to be processed can be heated and softened to a glass transition temperature point, taking PC as an example, the required temperature is 280-300 ℃, then the heated sheet is placed on a die pressing device through a manipulator, the die closing treatment is carried out, the volume deformation is generated through an elastic die core, the uniform pressure is generated on the surface of a cavity, and the uniform extrusion deformation of the sheet is realized; and finally, before the mould opening is carried out by the control pressure device, cooling the deformed sheet to a preset temperature, such as about 120 ℃, and after the sheet is shaped, opening the mould and taking out the product.
It should be noted that, the description in the embodiment of the molding apparatus may be specifically referred to in the embodiment of the molding method, and details are not repeated here.
According to the embodiment, the mold core is set to be the silica gel piece, uniform pressure can be generated on each cavity surface when the mold core is extruded and deformed, a formed product has uniform high-quality appearance effect, stable size, uniform mechanical performance and lower porosity, the device is simple in structure and convenient to disassemble, the mold pressing process is simple and convenient, and the device is suitable for various types of carbon fiber materials and various shapes of products in the forming process.
The molding apparatus and the molding method according to the present invention are described above by way of example with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that various modifications may be made to the molding apparatus and molding method of the present invention described above without departing from the scope of the invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.
Claims (12)
1. A molding apparatus, comprising: a front mold core and a rear mold core; wherein,
a special-shaped elastic mold core is limited in the front mold core, and a cavity matched with the shape of the elastic mold core is arranged in the rear mold core;
and the sheet to be processed is placed on the rear mold core, and the molding of the sheet to be processed is completed through the matching of the elastic mold core and the mold cavity.
2. The molding device according to claim 1, wherein a fixing bottom plate is provided at a side of the front mold core away from the rear mold core; wherein,
the front die core is fixed on the fixed bottom plate through a fastening bolt.
3. Embossing device as claimed in claim 2,
a step-shaped limiting clamping groove is formed in the front mold core;
the elastic mold core is provided with a limiting table matched with the limiting clamping groove, and the limiting table is clamped in the limiting clamping groove.
4. Embossing apparatus as claimed in claim 3,
and in a die assembly state, the limiting clamping groove, the fixed bottom plate and the die cavity are matched to form a limiting space for limiting the elastic die core.
5. Embossing device as claimed in claim 1,
the shape of the cavity is U-shaped, trapezoidal or arc.
6. Embossing device as claimed in claim 1,
the elastic mold core is a silica gel piece, and the rear mold core is a rigid piece.
7. Molding apparatus according to claim 6,
the Shore hardness range of the elastic mold core is 50-70A.
8. Embossing device as claimed in claim 1,
the sheet to be treated is thermosetting carbon fiber or thermoplastic carbon fiber.
9. Embossing device as claimed in claim 1,
and in the mold opening state, the volume of the elastic mold core is larger than that of the cavity.
10. A molding method characterized by performing a molding operation using the molding apparatus according to any one of claims 1 to 9, the method comprising: cutting the sheet to be processed to a preset shape size based on die cutting or CNC;
placing the sheet to be processed with the preset shape and size on a rear mold core of the mold pressing device;
controlling a front mold core of the mold pressing device to move downwards, and extruding the sheet to be processed through the matched mold of an elastic mold core in the front mold core and the rear mold core;
and controlling the mould pressing device to open the mould, and taking out the deformed sheet.
11. The molding method according to claim 10, further comprising a stage of controlling the curing of the deformed sheet during the clamping of the molding device; wherein,
the curing control conditions are as follows: the temperature is 130-160 ℃, the mould pressing time is 3-5 minutes, and the pressure is 5-7 Mpa.
12. The embossing method as set forth in claim 10, further including:
after cutting a thermoplastic carbon fiber plate to-be-processed sheet material to a preset shape and size based on die cutting or CNC, heating and softening the to-be-processed sheet material to a glass transition temperature point; and the number of the first and second groups,
and before controlling the mould pressing device to open the mould, cooling the deformed sheet to a preset temperature.
Priority Applications (1)
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CN202210332211.XA CN114919208A (en) | 2022-03-31 | 2022-03-31 | Molding apparatus and molding method |
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CN202210332211.XA CN114919208A (en) | 2022-03-31 | 2022-03-31 | Molding apparatus and molding method |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104690869A (en) * | 2013-12-10 | 2015-06-10 | 赫比(苏州)通讯科技有限公司 | Surface forming technology for thermally formed product |
CN107283875A (en) * | 2017-06-27 | 2017-10-24 | 东莞市海旭新材料技术有限公司 | It is a kind of based on can thermoplastic fibre composite case and bag and preparation method thereof |
CN107336480A (en) * | 2017-06-27 | 2017-11-10 | 东莞市海旭新材料技术有限公司 | Automotive upholstery based on prepreg carbon fibre composite and preparation method thereof |
CN112223780A (en) * | 2020-08-25 | 2021-01-15 | 河北工业职业技术学院 | Carbon fiber plate forming die and forming method |
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104690869A (en) * | 2013-12-10 | 2015-06-10 | 赫比(苏州)通讯科技有限公司 | Surface forming technology for thermally formed product |
CN107283875A (en) * | 2017-06-27 | 2017-10-24 | 东莞市海旭新材料技术有限公司 | It is a kind of based on can thermoplastic fibre composite case and bag and preparation method thereof |
CN107336480A (en) * | 2017-06-27 | 2017-11-10 | 东莞市海旭新材料技术有限公司 | Automotive upholstery based on prepreg carbon fibre composite and preparation method thereof |
CN112223780A (en) * | 2020-08-25 | 2021-01-15 | 河北工业职业技术学院 | Carbon fiber plate forming die and forming method |
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