CN116278203A - Method for processing preform - Google Patents

Method for processing preform Download PDF

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Publication number
CN116278203A
CN116278203A CN202211704126.8A CN202211704126A CN116278203A CN 116278203 A CN116278203 A CN 116278203A CN 202211704126 A CN202211704126 A CN 202211704126A CN 116278203 A CN116278203 A CN 116278203A
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CN
China
Prior art keywords
preform
buffer layer
difference
accommodating space
height
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211704126.8A
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Chinese (zh)
Inventor
杜路路
赵领航
杨火留
姚宏
段滨
张海洋
李侨
牛彩鹤
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Longi Green Energy Technology Co Ltd
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Longi Green Energy Technology Co Ltd
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Publication date
Application filed by Longi Green Energy Technology Co Ltd filed Critical Longi Green Energy Technology Co Ltd
Priority to CN202211704126.8A priority Critical patent/CN116278203A/en
Publication of CN116278203A publication Critical patent/CN116278203A/en
Pending legal-status Critical Current

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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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/06—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
    • 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
    • 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
    • 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
    • B32B38/18—Handling of layers or the laminate
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/028—Net structure, e.g. spaced apart filaments bonded at the crossing points
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/106—Carbon fibres, e.g. graphite fibres

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Abstract

The application provides a method for processing a preform. The processing method comprises the following steps: providing a mould, and adhering a buffer layer on the mould; arranging a convex shielding piece at the edge of the buffer layer so as to form an accommodating space between the shielding piece and the buffer layer; mounting the die on a needling machine, and sequentially paving a plurality of raw material layers in the accommodating space; needling the raw material layers to obtain an initial preform; cutting the initial preform to obtain a preform. The method and the device avoid the problems that the edge of the initial preform collapses, slides and lacks materials. Thus, the amount of scraps required to be cut at the edge portion of the initial preform can be reduced, the work load of cutting the initial preform can be reduced, and the cost of the preform can be reduced.

Description

Method for processing preform
Technical Field
The application belongs to the technical field of preforms, and particularly relates to a processing method of a preform.
Background
Along with the development of technology, the prefabricated body made of the carbon-carbon composite material is widely applied to various products in the photovoltaic technical field and the aerospace technical field. Specifically, the prefabricated body is a product formed by laying/winding and needling a plurality of unit layers layer by layer, the unit layers can specifically comprise a carbon cloth layer and a net tire layer, and carbon fibers on the net tire layer can penetrate into the carbon cloth layer in the needling forming process to form a three-dimensional net structure reinforcing body with certain strength between planes and layers.
In the prior art, the method for forming the preform generally includes three steps of mold preparation-layering, needling-cutting the preform. The method comprises the steps of preparing a mould, namely wrapping a heat-shrinkable film on a wood mould, and sticking a needled buffer layer on the heat-shrinkable film; the steps of layering and needling mainly comprise the steps of mounting a die on a special-shaped needling machine, winding carbon fibers, composite cloth, a net tire on the die, and finally needling according to parameters set on the machine until the perimeter size of a preform is qualified; the step of cutting the preform is mainly to take the mold off the needling machine and cut off the excess portions of the two ends of the preform.
However, in the process of processing the preform, the edge of the preform may have defects such as edge collapse, sliding wire, uneven layering, etc., so that the size of the preform needs to be made large enough, and enough cutting allowance is reserved, so that the desired preform can be cut. However, these cut off scraps cause a great waste, and the cost of the preform is greatly increased.
Disclosure of Invention
The application aims at providing a processing method of a preform, so as to solve the problems that the leftover materials cut off by the existing preform cause great waste and the cost is high.
In order to solve the technical problems, the application is realized as follows:
in a first aspect, the present application discloses a method for processing a preform, the method comprising:
providing a mould, and adhering a buffer layer on the mould;
arranging a convex shielding piece at the edge of the buffer layer so as to form an accommodating space between the shielding piece and the buffer layer;
mounting the die on a needling machine, and sequentially paving a plurality of raw material layers in the accommodating space;
needling the raw material layers to obtain an initial preform;
cutting the initial preform to obtain a preform.
Optionally, the step of providing a convex shielding member at an edge of the buffer layer so that an accommodating space is formed between the shielding member and the buffer layer includes:
forming a first adhesive layer at an edge of the buffer layer;
the shielding piece is adhered to the first adhesive layer, so that an accommodating space is formed between the shielding piece and the buffer layer.
Optionally, the height of the shielding piece is equal to the height of the prefabricated body, the difference between the height of the shielding piece and the height of the prefabricated body is less than or equal to 10mm, and the width of the shielding piece is 10-60mm.
Optionally, the preform is a cylindrical preform, and the mold is a columnar mold;
the step of arranging a convex shielding piece at the edge of the buffer layer so as to form an accommodating space between the shielding piece and the buffer layer comprises the following steps:
the buffer layer is respectively provided with convex shielding pieces along two ends of the columnar die, the shielding pieces extend around the circumference of the columnar die, and annular accommodating spaces are formed between the shielding pieces and the buffer layer.
Optionally, the difference between the height of the shielding piece protruding out of the buffer layer and the height of the preform is less than or equal to 10mm, and the width of the shielding piece along the axial direction of the columnar die is 10-60mm.
Optionally, a difference between a length of the accommodating space along an axial direction of the columnar die and a length of the preform is a first difference, and the first difference is less than or equal to 20 mm.
Optionally, the preform is a plate-shaped preform, and the mold is a plate-shaped mold;
the step of arranging a convex shielding piece at the edge of the buffer layer so as to form an accommodating space between the shielding piece and the buffer layer comprises the following steps:
the periphery edge of the buffer layer is provided with a convex shielding piece, and a platy accommodating space is formed between the shielding piece and the buffer layer.
Optionally, the difference between the height of the shielding member protruding from the buffer layer and the height of the preform is less than or equal to 10 mm;
the width of the shielding piece is 10-60mm;
the difference between the length of the accommodating space and the length of the preform is a second difference, the difference between the width of the accommodating space and the width of the preform is a third difference, and both the second difference and the third difference are smaller than or equal to 20 mm.
Optionally, the step of providing a mold and attaching a buffer layer on the mold specifically includes:
providing a mould, and wrapping a heat shrinkage film on the mould;
forming a second bonding layer outside the heat shrinkage film;
and adhering the buffer layer outside the second adhesive layer.
Optionally, the shielding member comprises one of a polyvinyl chloride shielding member, a foam shielding member, a rubber shielding member and a plastic shielding member.
In this embodiment, in the course of working of preform, through set up the shielding member of evagination at the edge of buffer layer, so that shielding member with form accommodation space between the buffer layer. Due to the limiting function of the shielding piece, the problems of edge collapse, silk slipping, material shortage and the like of the edge of the initial preform can be avoided in the process of sequentially paving a plurality of raw material layers in the accommodating space and carrying out needling operation on the raw material layers. Thus, the amount of scraps required to be cut at the edge portion of the initial preform can be reduced, the work load of cutting the initial preform can be reduced, and the cost of the preform can be reduced.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart of steps of a method for fabricating a preform according to an embodiment of the present application;
FIG. 2 is a flow chart of steps of another preform processing method according to an embodiment of the present application;
FIG. 3 is a schematic structural view of a columnar mold according to an embodiment of the present application;
FIG. 4 is a detailed schematic view of the position of the pillar die A shown in FIG. 3;
FIG. 5 is a flow chart illustrating steps of a method for fabricating a preform according to an embodiment of the present application;
FIG. 6 is a schematic view of a plate mold according to an embodiment of the present application;
fig. 7 is a sectional view of the plate mold shown in fig. 6.
Reference numerals: 1-columnar mould, 10-mould axle, 11-columnar mould body, 2-buffer layer, 3-shielding piece, 4-platy mould, 5-accommodation space.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements throughout or elements having like or similar functionality. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The features of the terms "first", "second", and the like in the description and in the claims of this application may be used for descriptive or implicit inclusion of one or more such features. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The embodiment of the application provides a method for processing a preform. Specifically, the preform may be a needled preform made of a carbon-carbon composite material. By way of example, the preform may include, but is not limited to, at least one of a crucible preform, a thermal cylinder preform, and a thermal shield preform, and the specific type of the preform may not be limited in the embodiments of the present application.
Referring to fig. 1, a step flow chart of a method for processing a preform according to an embodiment of the present application is shown, and as shown in fig. 1, the method for processing a preform may specifically include the following steps:
step 101: providing a mould and pasting a buffer layer on the mould.
In this embodiment of the present application, the mold may be a wooden mold, and the shape and size of the mold may be determined according to the shape and size of the preform to be processed, which is not limited in this embodiment of the present application.
In a specific application, before the raw material layer is paved, a buffer layer can be stuck on the surface of the die, and the buffer layer can be used for buffering the subsequent needling process, so that the safety of the needling process is improved.
In an alternative embodiment of the present application, the step of providing a mold and attaching a buffer layer on the mold may specifically include the following substeps:
substep S11: providing a mould, and wrapping a heat shrinkage film on the mould.
In this embodiment, before setting up on the mould the buffer layer, can earlier wrap up the pyrocondensation membrane on the mould, so as to use hot-blast right the pyrocondensation membrane heats, until the pyrocondensation membrane is leveled and inseparable parcel the mould.
In a specific application, the heat-shrinkable film can be used for isolating the subsequent buffer layer from the die, so that after the needling process is completed, the buffer layer is removed from the die, and the separation of the buffer layer from the die is facilitated due to the isolation of the heat-shrinkable film, the damage to the die can be avoided, and the recycling of the die is facilitated.
Substep S12: and forming a second bonding layer outside the heat-shrinkable film.
In this embodiment, after the heat shrink film is wrapped on the mold, a second adhesive layer may be formed on the heat shrink film. For example, the material of the second adhesive layer may include, but is not limited to, adhesive media such as glue, structural glue, etc., and the specific material of the second adhesive layer in the embodiments of the present application may not be limited.
Substep S13: and adhering the buffer layer outside the second adhesive layer.
In this embodiment, after the second adhesive layer is formed outside the heat shrinkable film, a buffer layer may be adhered to the outside of the second adhesive layer, so as to fix the buffer layer on the mold.
Step 102: and a convex shielding piece is arranged at the edge of the buffer layer, so that an accommodating space is formed between the shielding piece and the buffer layer.
In this embodiment, after the buffer layer is fixed on the mold, an outer convex shielding member may be disposed at an edge of the buffer layer, so as to form an outer convex "retaining wall" at an edge of the buffer layer, so that an accommodating space is formed between the shielding member and the buffer layer. The shielding piece can be used for paving raw material layers in the subsequent process and forming limit by needling. Thus, the problems of edge collapse, silk slipping, material shortage and the like of the initial preform can be avoided in the process of sequentially paving a plurality of raw material layers in the accommodating space and carrying out needling operation on the raw material layers.
Optionally, the step of providing a convex shielding member at the edge of the buffer layer, so that a receiving space is formed between the shielding member and the buffer layer may specifically include the following substeps:
substep S21: and forming a first bonding layer at the edge of the buffer layer.
In this embodiment, after the buffer layer is disposed on the mold, a first adhesive layer may be formed at an edge of the buffer layer. For example, the material of the first adhesive layer may include, but is not limited to, adhesive media such as glue, structural glue, etc., and the specific material of the first adhesive layer in the embodiments of the present application may not be limited.
Substep S22: the shielding piece is adhered to the first adhesive layer, so that an accommodating space is formed between the shielding piece and the buffer layer.
In this embodiment, after the first adhesive layer is formed at the edge of the buffer layer, the shielding member may be adhered to the outside of the first adhesive layer, so as to fix the shielding member to the outside of the first adhesive layer.
Optionally, the difference between the height of the shield and the height of the preform is less than or equal to 10mm, and the width of the shield is 10-60mm. In a specific application, the difference between the height of the shutter and the height of the preform is less than or equal to 10mm may be: the height difference between the shielding piece and the prefabricated body is within +/-10 mm. Therefore, reliable limiting of the prefabricated body can be achieved, the defects of edge collapse, sliding wire, material shortage and the like of the prefabricated body are avoided, and the influence of too high protrusion of the shielding piece on the subsequent needling process can be avoided. And the width of the shielding piece is set to be 10-60mm, so that the shielding piece can keep good strength, and the limit reliability of the shielding piece on the prefabricated body is further improved.
It should be noted that, in a specific application, the height of the shielding element may be equal to the height of the preform, i.e., the height of the shielding element is substantially equal to the height of the preform, and need not be completely equal, and the height of the shielding element may be slightly greater than or slightly less than the height of the preform.
For example, in the case where the height of the preform is 40 mm, the height of the shield may be 35 mm, 37 mm, 40 mm, 45 mm, or the like, and the heights of the shield and the preform are not particularly limited in the embodiments of the present application.
Similarly, in practical applications, the width of the shield can be set by those skilled in the art according to the actual needs. By way of example, the width of the shield may be 10mm, 20 mm, 38 mm, 60mm, etc., and the width of the shield is not particularly limited in the embodiments of the present application.
Optionally, the material of the buffer layer may be polyvinyl chloride, foam, rubber, etc. Accordingly, the shielding member may include one of a polyvinyl chloride shielding member, a foam shielding member, a rubber shielding member and a plastic shielding member, and specific materials of the shielding member in the embodiment of the present application may not be limited.
Step 103: and installing the die on a needling machine, and sequentially paving a plurality of raw material layers in the accommodating space.
In this embodiment, after the shielding member is disposed at the edge of the buffer layer, the die may be mounted on the needling machine, and a plurality of raw material layers may be sequentially laid in the accommodating space formed between the shielding member and the buffer layer. The raw material layer may be a carbon fiber layer, a composite cloth, a net tire layer, etc. for forming the preform, and specific materials of the raw material layer in the embodiment of the present application may not be limited.
In a specific application, the raw material layers such as the carbon fiber layer, the composite cloth, the net tire layer and the like can be prepared first. Then, wrapping a layer of composite cloth and a net tire layer on the die, and paving a plurality of carbon fiber layers on the net tire layer. Wherein, the distance between two adjacent circles of carbon fibers can be 5 mm, 6 mm or 8 mm, etc.
In this embodiment of the application, because the shielding member is in the limiting effect at buffer layer edge can make lay the former material layer in the accommodation space can be complete fill in the accommodation space, avoid appearing the problem of the edge unfilled stock of preform.
Step 104: and carrying out needling operation on the raw material layers to obtain an initial preform.
In this application implementation, after the plurality of raw material layers are laid in the accommodation space, a needling operation may be performed on the plurality of raw material layers to obtain the initial preform.
In the process of needling operation, as the shielding piece can support the edge of the initial preform like a wall, the problems of edge collapse and sliding wire in the needling process are reduced, and the quality of the edge position of the initial preform is improved. Thus, the amount of scraps required to be cut at the edge part of the initial preform can be reduced, the workload of cutting the initial preform can be reduced, and the cost of the preform can be reduced.
Step 105: cutting the initial preform to obtain a preform.
In this embodiment, after the initial preform is obtained by needling, the mold may be removed from the needling machine, the height of the initial preform at the position on the mold is measured, and the excess portions (with a single side width of about 10 mm) at both ends of the preform are cut off, so as to obtain the final desired preform.
In a specific application, the shielding piece can reduce the problems of edge collapse and sliding wire in the needling process, and improve the quality of the edge position of the initial preform. Therefore, the initial preform requires less scrap to be cut. Compared with the prior art, the leftover materials required to be cut of the initial preform manufactured by the processing method can be reduced by 90%, so that the workload of cutting the initial preform is greatly reduced, and the cost of the preform is reduced.
In summary, the method for processing a preform according to the embodiments of the present application may at least include the following advantages:
in this embodiment, in the course of working of preform, through set up the shielding member of evagination at the edge of buffer layer, so that shielding member with form accommodation space between the buffer layer. Due to the limiting function of the shielding piece, the problems of edge collapse, silk slipping, material shortage and the like of the edge of the initial preform can be avoided in the process of sequentially paving a plurality of raw material layers in the accommodating space and carrying out needling operation on the raw material layers. Thus, the amount of scraps required to be cut at the edge portion of the initial preform can be reduced, the work load of cutting the initial preform can be reduced, and the cost of the preform can be reduced.
In some alternative embodiments of the application, the preform may be a cylindrical preform, and the mold may be a cylindrical mold, accordingly. For example, the preform may be a thermal cylinder or a crucible, or the like.
Referring to fig. 2, a step flow chart of another method for processing a preform according to an embodiment of the present application is shown, and as shown in fig. 2, the processing method may specifically include the following steps:
step 201: providing a columnar mould, and adhering a buffer layer on the columnar mould.
Referring to fig. 3, a schematic structural view of a cylindrical mold according to an embodiment of the present application is shown, and referring to fig. 4, a detailed schematic structural view of a position of the cylindrical mold a shown in fig. 3 is shown. As shown in fig. 3 and 4, the cylindrical mold 1 may include a mold shaft 10 and a cylindrical mold body 11, and the cylindrical mold body 11 may be sleeved outside the mold shaft 10.
In this embodiment, the axial length of the columnar die 1 may be about 100 mm greater than the length of the preform that is finally required, so as to leave a sufficient cutting space. Specifically, the buffer layer 2 can be adhered to the outer surface of the columnar die body 11 along the circumferential direction of the columnar die 1, and the buffer layer 2 can be used for buffering the subsequent needling process, so that the safety of the needling process is improved.
In a specific application, the shape and size of the mold may be determined according to the shape and size of the preform to be processed. For example, in the case where it is desired to prepare a cylindrical preform having a diameter of 1000 mm, a length of 1500 mm and a thickness of 30 mm, a cylindrical mold 1 having a diameter of 915 mm and a length of 1600 mm may be selected. The outer surface of the columnar die 1 can be provided with a heat shrinkage film with the thickness of 0.5 mm, and a buffer layer 2 with the thickness of 12 mm is adhered.
Step 202: the buffer layer is respectively provided with convex shielding pieces along two ends of the columnar die, the shielding pieces extend around the circumference of the columnar die, and annular accommodating spaces are formed between the shielding pieces and the buffer layer.
In this application implementation, after fixing buffer layer 2 on columnar mould 1, can set up the shielding member 3 of evagination respectively at buffer layer 2 along the both ends of columnar mould 1, shielding member 3 extends around the circumference of columnar mould 1, forms annular accommodation space between two shielding members 3 and buffer layer 2. The shielding 3 can be used for laying of raw material layers in subsequent processes and needling to form a limit. Thus, the problems of edge collapse, silk slipping, material shortage and the like of the initial preform can be avoided in the process of sequentially paving a plurality of raw material layers in the accommodating space and carrying out needling operation on the raw material layers.
Alternatively, the difference between the height of the shutter 3 protruding from the buffer layer 2 and the height of the preform is less than or equal to 10mm, and the width of the shutter 3 in the axial direction of the columnar mold 1 is 10 to 60mm. In a specific application, the difference between the height of the shutter 3 protruding from the buffer layer 2 and the height of the preform is less than or equal to 10mm may be: the height difference between the height of the shielding piece 3 protruding from the buffer layer 2 and the height of the prefabricated body is within +/-10 millimeters, so that reliable limiting of the prefabricated body can be achieved, the defects of edge collapse, sliding wire, material shortage and the like of the prefabricated body are avoided, and the influence of the too high protrusion of the shielding piece 3 on the subsequent needling process can be avoided. The width of the shielding piece 3 along the axial direction of the columnar die 1 is 10-60mm, so that the shielding piece 3 can keep good strength, and the limit reliability of the shielding piece 3 on the prefabricated body is further improved.
It should be noted that in a specific application, the height of the shielding element 3 may be equal to the height of the preform, i.e. the height of the shielding element 3 is substantially equal to the height of the preform, and need not be completely equal, and the height of the shielding element 3 may be slightly greater or slightly less than the height of the preform.
For example, in the case where the height of the preform is 30 mm, the height of the shield 3 may be 29 mm, 29.5 mm, 30 mm, 32 mm or the like, and the heights of the shield 3 and the preform are not particularly limited in the embodiment.
Similarly, in practical applications, the width of the shield 3 can be set by those skilled in the art according to practical needs. By way of example, the width of the shutter 3 may be 10mm, 20 mm, 38 mm, 40 mm, 60mm, or the like, and the width of the shutter 3 is not particularly limited in the embodiments of the present application.
For example, in the case where it is necessary to prepare a cylindrical preform having a diameter of 1000 mm, a length of 1500 mm and a thickness of 30 mm, it is possible to attach a buffer layer 2 having a thickness of 12 mm to the outside of the columnar die 1 and to provide a shutter 3 having a width of 40 mm and a height of 30 mm at both ends of the buffer layer 2 along the columnar die 1, respectively.
Alternatively, the material of the buffer layer 2 may be polyvinyl chloride, foam, rubber, or the like. Accordingly, the shielding element 3 may include one of a polyvinyl chloride shielding element, a foam shielding element, a rubber shielding element and a plastic shielding element, and the specific material of the shielding element 3 in this embodiment of the present application may not be limited.
Optionally, since the shielding member 3 may avoid the problems of edge collapse, sliding wire, material shortage and the like of the preform, a difference between the length of the accommodating space along the axial direction of the columnar die 1 and the length of the preform is a first difference, and the first difference is less than or equal to 20 mm, so that the single-side cutting allowance of the preform is controlled within 10 mm. Thus, the amount of scraps required to be cut at the edge portion of the initial preform can be reduced, the work load of cutting the initial preform can be reduced, and the cost of the preform can be reduced.
Step 203: and installing the die on a needling machine, and sequentially paving a plurality of raw material layers in the annular accommodating space.
In this embodiment, after forming the annular accommodating space between the two shielding members 3 and the buffer layer 2, the die may be mounted on the needling machine, and the plurality of raw material layers may be sequentially laid in the annular accommodating space.
For example, in the case where it is necessary to prepare a cylindrical preform having a diameter of 1000 mm, a length of 1500 mm and a thickness of 30 mm, it is possible to attach a buffer layer 2 having a thickness of 12 mm to the outside of the columnar die 1 and to provide a shutter 3 having a width of 40 mm and a height of 30 mm at both ends of the buffer layer 2 along the columnar die 1, respectively. And a carbon fiber layer, a composite cloth and a net tire layer with a width of 1520 mm are laid on the accommodation space in a certain order. Wherein, the distance between two adjacent circles of carbon fibers can be 5 mm, 6 mm or 8 mm, etc.
In this embodiment of the application, because the limiting effect of shielding member 3 at buffer layer 2 edge can make lay the former material layer in the accommodation space can be complete fill in the accommodation space, avoid appearing the problem of the edge unfilled stock of preform.
Step 204: needling the raw material layers to obtain an initial preform;
in this embodiment, step 204 may be performed with reference to step 104 in the foregoing embodiment, which is not described herein.
Step 205: cutting the initial preform to obtain a preform.
In this embodiment, step 205 may be performed with reference to step 105 in the foregoing embodiment, which is not described herein.
Specifically, the height of the initial preform on the columnar die 1 may be measured, and then the excess portions (single-side width about 10 mm) of both ends of the initial preform may be cut off. In this embodiment of the present application, in the case that the preform is a heat insulation cylinder, the weight of the cut scrap is reduced by 90% in the prior art. Under the condition that the prefabricated body is a crucible, the leftover materials of the crucible opening and the crucible bottom of the prefabricated body can be cut, the width of the leftover materials of the crucible opening is about 10mm, and the weight of the cut leftover materials is reduced by 81% compared with that of the original materials.
In some alternative embodiments of the application, the preform is a plate-shaped preform, and the mold may be a plate-shaped mold, accordingly.
Referring to fig. 5, a step flow chart of a method for processing still another preform according to an embodiment of the present application is shown, and as shown in fig. 5, the method may specifically include the following steps:
step 501: providing a plate-shaped mold, and adhering a buffer layer on the plate-shaped mold.
Referring to fig. 6, a schematic structural diagram of a plate-shaped mold according to an embodiment of the present application is shown, and referring to fig. 7, a sectional structural diagram of the plate-shaped mold shown in fig. 6 is shown. As shown in fig. 6 and 7, the buffer layer 2 is provided on one surface of the plate-like mold 4.
In the embodiment of the present application, the size of the plate-shaped mold 4 may be larger than the size of the plate-shaped preform that is finally required to leave a sufficient cutting space. For example, in the case where it is desired to prepare a plate-like preform having a diameter of 500 mm and a thickness of 30 mm, a plate-like mold 4 having a length and a width of 700 mm may be selected. The outer surface of the plate-shaped mold 4 may be provided with a heat shrink film of 0.5 mm and a buffer layer 2 of 12 mm in thickness is attached.
Step 502: the periphery edge of the buffer layer is provided with a convex shielding piece, and a platy accommodating space is formed between the shielding piece and the buffer layer.
In the embodiment of the present application, after the buffer layer 2 is fixed on the plate-shaped mold 4, a plate-shaped accommodating space 5 may be formed between the shutter 3 and the buffer layer 2 by the shutter 3 protruding outward from the buffer layer 2 along the peripheral edge of the plate-shaped mold 4. The shielding 3 can be used for laying of raw material layers in subsequent processes and needling to form a limit. Thus, in the process of sequentially laying a plurality of raw material layers in the accommodating space 5 and carrying out needling operation on the raw material layers, the problems of edge collapse, silk slipping, material shortage and the like of the edge of the initial preform can be avoided.
Optionally, the difference between the height of the shutter 3 protruding from the buffer layer 2 and the height of the preform is less than or equal to 10 mm; the width of the shield 3 is 10-60mm. In a specific application, the difference between the height of the shutter 3 protruding from the buffer layer 2 and the height of the preform is less than or equal to 10mm may be: the height difference between the height of the shielding piece 3 protruding from the buffer layer 2 and the height of the prefabricated body is within +/-10 millimeters, so that reliable limiting of the prefabricated body can be achieved, the defects of edge collapse, sliding wire, material shortage and the like of the prefabricated body are avoided, and the influence of the too high protrusion of the shielding piece 3 on the subsequent needling process can be avoided. The width of the shielding piece 3 is 10-60mm, so that the shielding piece 3 can keep good strength, and the limit reliability of the shielding piece 3 on the prefabricated body is further improved.
It should be noted that in a specific application, the height of the shielding element 3 is equal to the height of the preform, i.e. the height of the shielding element 3 is substantially equal to the height of the preform, and is not necessarily completely equal, and the height of the shielding element 3 may be slightly greater or slightly less than the height of the preform.
For example, in the case where the height of the preform is 30 mm, the height of the shield 3 may be 29 mm, 29.5 mm, 30 mm, 32 mm or the like, and the heights of the shield 3 and the preform are not particularly limited in the embodiment.
Similarly, in practical applications, the width of the shield 3 can be set by those skilled in the art according to practical needs. By way of example, the width of the shutter 3 may be 10mm, 20 mm, 38 mm, 40 mm, 60mm, or the like, and the width of the shutter 3 is not particularly limited in the embodiments of the present application. The difference between the length of the accommodating space 5 and the length of the preform is a second difference, the difference between the width of the accommodating space 5 and the width of the preform is a third difference, and both the second difference and the third difference are smaller than or equal to 20 mm. Therefore, the single-side cutting allowance of the preform can be controlled within 10 millimeters, the amount of leftover materials required to be cut at the edge part of the initial preform is reduced, the workload of cutting the initial preform is reduced, and the cost of the preform is reduced.
For example, in the case where it is desired to produce a plate-like preform having a diameter of 500 mm and a thickness of 30 mm, a receiving space 5 having a length and a width of 510 mm and a height of 30 mm may be formed on the buffer layer 2 by using a shutter 3 having a height of 30 mm.
Step 503: and mounting the die on a needling machine, and sequentially paving a plurality of raw material layers in the platy accommodating space.
In this embodiment, after the plate-shaped accommodation space 5 is formed between the two shutters 3 and the buffer layer 2, the mold may be mounted on the needling machine, and a plurality of raw material layers may be sequentially laid in the plate-shaped accommodation space 5.
For example, in the case where it is necessary to prepare a plate-like preform having a diameter of 500 mm and a thickness of 30 mm, a receiving space 5 having a length and a width of 510 mm and a height of 30 mm may be formed on the cushioning layer 2 by using a shutter 3 having a height of 30 mm. And the carbon fiber layer, the composite cloth and the net tire layer with the length and the width being 508 are laid in the accommodating space 5 according to a certain sequence. Wherein, the distance between two adjacent circles of carbon fibers can be 5 mm, 6 mm or 8 mm, etc.
In this embodiment of the application, because the limiting effect of shielding member 3 at buffer layer 2 edge can make the raw material layer of laying in accommodation space 5 can complete packing in accommodation space 5, avoids appearing the problem of the edge unfilled stock of preform.
Step 504: and carrying out needling operation on the raw material layers to obtain an initial preform.
In this embodiment, step 504 may be performed with reference to step 104 in the foregoing embodiment, which is not described herein.
Step 505: cutting the initial preform to obtain a preform.
In this embodiment, step 505 may be performed with reference to step 105 in the foregoing embodiment, which is not described herein.
Specifically, the height of the initial preform on the plate-like mold 4 may be measured, and then the excess portions (single-side width about 10 mm) of both ends of the initial preform may be cut off. In this embodiment, in the case where the preform is a plate-shaped preform, the weight of the cut scrap is reduced by 91% in the prior art.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A method of processing a preform, the method comprising:
providing a mould, and adhering a buffer layer on the mould;
arranging a convex shielding piece at the edge of the buffer layer so as to form an accommodating space between the shielding piece and the buffer layer;
mounting the die on a needling machine, and sequentially paving a plurality of raw material layers in the accommodating space;
needling the raw material layers to obtain an initial preform;
cutting the initial preform to obtain a preform.
2. The method according to claim 1, wherein,
the step of providing a convex shielding member at the edge of the buffer layer so that an accommodating space is formed between the shielding member and the buffer layer comprises the following steps:
forming a first adhesive layer at an edge of the buffer layer;
the shielding piece is adhered to the first adhesive layer, so that an accommodating space is formed between the shielding piece and the buffer layer.
3. The method of claim 1, wherein the difference between the height of the shield and the height of the preform is less than or equal to 10mm and the width of the shield is 10-60mm.
4. The method of processing according to claim 1, wherein the preform is a cylindrical preform, and the mold is a columnar mold;
the step of arranging a convex shielding piece at the edge of the buffer layer so as to form an accommodating space between the shielding piece and the buffer layer comprises the following steps:
the buffer layer is respectively provided with convex shielding pieces along two ends of the columnar die, the shielding pieces extend around the circumference of the columnar die, and annular accommodating spaces are formed between the shielding pieces and the buffer layer.
5. The method according to claim 4, wherein a difference between a height of the shielding member protruding from the buffer layer and a height of the preform is 10mm or less, and a width of the shielding member in an axial direction of the columnar die is 10 to 60mm.
6. The method according to claim 4, wherein a difference between a length of the accommodating space in an axial direction of the columnar die and a length of the preform is a first difference, and the first difference is less than or equal to 20 mm.
7. The method of processing according to claim 1, wherein the preform is a plate-like preform, and the mold is a plate-like mold;
the step of arranging a convex shielding piece at the edge of the buffer layer so as to form an accommodating space between the shielding piece and the buffer layer comprises the following steps:
the periphery edge of the buffer layer is provided with a convex shielding piece, and a platy accommodating space is formed between the shielding piece and the buffer layer.
8. The method according to claim 7, wherein a difference between a height of the shield protruding from the buffer layer and a height of the preform is less than or equal to 10 mm;
the width of the shielding piece is 10-60mm;
the difference between the length of the accommodating space and the length of the preform is a second difference, the difference between the width of the accommodating space and the width of the preform is a third difference, and both the second difference and the third difference are smaller than or equal to 20 mm.
9. The method of claim 1, wherein the step of providing a mold and attaching a buffer layer to the mold comprises:
providing a mould, and wrapping a heat shrinkage film on the mould;
forming a second bonding layer outside the heat shrinkage film;
and adhering the buffer layer outside the second adhesive layer.
10. The method of any one of claims 1 to 9, wherein the shield comprises one of a polyvinyl chloride shield, a foam shield, a rubber shield, and a plastic shield.
CN202211704126.8A 2022-12-28 2022-12-28 Method for processing preform Pending CN116278203A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211704126.8A CN116278203A (en) 2022-12-28 2022-12-28 Method for processing preform

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211704126.8A CN116278203A (en) 2022-12-28 2022-12-28 Method for processing preform

Publications (1)

Publication Number Publication Date
CN116278203A true CN116278203A (en) 2023-06-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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