CN110549643B

CN110549643B - Antenna cover plate profiling prefabricated part puncturing method and antenna cover plate forming method

Info

Publication number: CN110549643B
Application number: CN201910844601.3A
Authority: CN
Inventors: 不公告发明人
Original assignee: Changsha Jingyou New Material Technology Co ltd
Current assignee: Changsha Jingyou New Material Technology Co ltd
Priority date: 2019-09-06
Filing date: 2019-09-06
Publication date: 2021-09-07
Anticipated expiration: 2039-09-06
Also published as: CN110549643A

Abstract

The invention discloses an antenna cover plate profiling prefabricated part puncturing method and an antenna cover plate forming method, wherein the puncturing method comprises the following steps: continuously laying a layer of fiber cloth on the outer surface of the mold; adjusting fiber gaps of the fiber cloth on the raised part of the mold to enable the fiber cloth to be matched with the outer surface of the mold and form a fiber cover; repeating the laying and the adjustment of the multiple layers of fiber cloth, and finishing the laying of a laminated unit when the number of the laid fiber cloth layers reaches a preset number; repeating the laying of a plurality of laminated units, wherein at least two adjacent units are sewn in the laying process of the laminated units until a preset thickness is reached; and (4) demoulding after penetrating and sewing along the sewing groove on the mould, and penetrating and sewing in the whole thickness direction. The problems that local stress is weak and raw materials are wasted in the prior art are solved, the strength of the antenna cover plate prefabricated part is improved, and cost is reduced.

Description

Antenna cover plate profiling prefabricated part puncturing method and antenna cover plate forming method

Technical Field

The invention relates to the technical field of aerospace prefabricated parts, in particular to an antenna cover plate profiling prefabricated part puncturing method and an antenna cover plate forming method.

Background

Due to factors such as the use environment, the antenna is usually arranged in a space surrounded by the radome and the antenna cover plate for protecting the antenna, the radome and the antenna cover plate need to be made of wave-transmitting materials and have certain strength, and the radome and the cover plate are usually obtained by processing prefabricated parts.

Referring to fig. 1, the conventional antenna cover plate is obtained by machining a plate preform 10 formed by overlapping, laying or weaving a plurality of layers of fiber cloth, the side surface of the antenna cover plate 20 obtained by the method is obtained by longitudinally cutting interlayer fibers, and the whole side surface is formed by stacking a plurality of cut short fibers 21 in the height direction and mainly bears interlayer shear stress, so that the strength is not high; and the processing allowance is very large, thereby wasting a large amount of fiber raw materials and processing cost.

Disclosure of Invention

The invention provides an antenna cover plate profiling prefabricated part puncturing method and an antenna cover plate forming method, which are used for overcoming the defects that an antenna cover plate in the prior art has a weak stress area and low overall strength and the like, improving the stress balance and the overall strength of the overall structure, and reducing the consumption of fiber raw materials and the processing cost.

In order to achieve the purpose, the invention provides an antenna cover plate profiling prefabricated part puncturing method, which comprises the following steps:

continuously laying a layer of fiber cloth on the outer surface of the mold;

adjusting fiber gaps of the fiber cloth on the raised part of the mold to enable the fiber cloth to be matched with the outer surface of the mold and form a fiber cover;

repeating the laying and the adjustment of the multiple layers of fiber cloth, and finishing the laying of a laminated unit when the number of the laid fiber cloth layers reaches a preset number;

repeating the laying of a plurality of laminated units, wherein at least two adjacent units are sewn in the laying process of the laminated units until a preset thickness is reached;

and (4) demoulding after penetrating and sewing along the sewing groove on the mould, and penetrating and sewing in the whole thickness direction.

In order to achieve the above object, the present invention further provides an antenna cover plate forming method, including the following steps:

preparing and obtaining a prefabricated part by the antenna cover plate profiling prefabricated part puncturing method;

clamping two surfaces of the prefabricated part in the thickness direction by using two rigid molds, and adjusting the gap between the two rigid molds according to the control allowance so as to control the thickness of the prefabricated part within a preset range;

putting the two rigid molds and the prefabricated member into a dipping tank integrally, vacuumizing the dipping tank until the air pressure is less than or equal to 1000Pa, sucking the water-alcohol solution or the silicon dioxide sol of the tetraethoxysilane by a dipping tank, and submerging the prefabricated member to enable the prefabricated member to be capable of penetrating through the gap between the two rigid molds or the hole of the rigid mold to be in complete contact with the water-alcohol solution or the silicon dioxide sol of the tetraethoxysilane; soaking for 5-12 hours at normal temperature;

taking out the prefabricated part and the two rigid molds integrally, treating at 70-90 ℃ for 12-24 hours, then drying at 110-130 ℃ for 4-8 hours, and then drying at 140-160 ℃ for 2-4 hours; the pressure in the whole drying and curing process is normal pressure-10 MPa; demolding to obtain a mixture;

repeating the steps of dipping, drying and curing, and circularly dipping and curing for 1-7 times to obtain a cured mixture;

placing the solidified mixture in a high-temperature furnace, and treating for 1-2 hours at the temperature of 700 ℃ and 900 ℃ to sinter and densify the silicon dioxide solid to obtain a semi-finished product;

repeating the steps of dipping, drying and curing, circulating dipping and curing and sintering on the semi-finished product for 1-5 times to obtain a molded product;

and obtaining the molded antenna cover plate after allowance is made for the molded product.

According to the antenna cover plate profiling prefabricated part puncturing method and the antenna cover plate forming method, the supporting and laying molded surface is provided for the prefabricated part through the mold with the shape matched with the shape of the antenna cover plate, the fiber cloth laid on the outer surface of the mold is obtained by adjusting the fiber gap, and the continuous fibers of the integral laying layer of the antenna cover plate prefabricated part are formed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic diagram of a prior art structure;

fig. 2 is a schematic structural diagram of a product manufactured by a puncturing method of a profiling prefabricated member of an antenna cover plate according to an embodiment of the invention;

fig. 3 is a schematic structural diagram of a mold used in the first embodiment.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; the connection can be mechanical connection, electrical connection, physical connection or wireless communication connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Example one

As shown in fig. 2, the method for puncturing the profiling prefabricated part of the antenna cover plate comprises the following steps:

s1, continuously laying a layer of fiber cloth on the outer surface of the mould;

the fiber cloth is woven by the woven cloth layer and is woven by the bidirectional fibers, the fiber cloth covers the die, and the center position of the fiber cloth is opposite to the center position of the raised top surface of the die, so that the waste of raw materials is reduced.

S2, adjusting the fiber gap of the fiber cloth on the convex part of the mould to make the fiber cloth fit with the outer surface of the mould and form a fiber cover;

the process can be adjusted manually or by a mould, the fiber cloth is deformed by the change of the gaps between longitudinal and transverse bidirectional fibers, a three-dimensional fiber cover is formed after the deformation, the fiber cover integrally covers the outer surface of the mould and has the same shape as the whole shape of the antenna cover prefabricated member, a prefabricated member blank is formed by laying a plurality of layers of fiber covers, and the prefabricated member blank formed by the method is continuous on the whole laying layer and has no fault or short fiber, so the integral performance is greatly enhanced.

A first lamination unit 1 which can be formed by single thread through stitching in order to increase interlayer bonding force; or through stitching after all the laminated units are laid;

s3, repeating the laying and adjustment of the multiple layers of fiber cloth, and finishing the laying of a laminated unit when the number of the laid fiber cloth layers reaches a preset number;

s4, repeating the laying of the plurality of stacking units, sewing at least two adjacent stacking units in the laying process of the stacking units until the stacking units reach a preset thickness, and sequentially laying from inside to outside to form a first stacking unit 1, a second stacking unit 2 and a third stacking unit 3 … … Nth stacking unit N until the stacking units reach the preset thickness;

in an embodiment of the invention, after the first laminating unit 1 is laid, a single line penetrates through the first laminating unit 1 along a sewing groove formed on a mold in the thickness direction for continuous sewing; then laying the second laminating unit 2, and after laying is finished, penetrating the first laminating unit 1 and the second laminating unit 2 along the sewing groove on the mould in the thickness direction for single-thread sewing; then laying the third laminating unit 3, and after laying is finished, penetrating at least the third laminating unit 3 and a part of the second laminating unit 2 (or the whole second laminating unit 2) along the sewing groove on the mould in the thickness direction to sew the third laminating unit 3 and the second laminating unit 2; after the fourth stacking unit 4 is completely laid, the fourth stacking unit 4 is sewn with the third stacking unit 3 by penetrating at least the fourth stacking unit 3 and a part of the third stacking unit 3 (or the entire third stacking unit 3) in the thickness direction along the sewing grooves; and repeating the steps until the interlayer sewing of the first lamination unit 1, the second lamination unit 2, the third lamination unit 3, … …, the N-1 lamination unit and the N lamination unit N is completed.

In this embodiment, after finishing one stacking unit each time, interlayer stitching is performed on the currently finished stacking unit and the stacking unit adjacent to the currently finished stacking unit, and in order to reduce the stitching thickness, only the adjacent stacking unit may be stitched, but in the stitching process, the precision of the thickness is not easy to grasp, and in order to improve the stitching efficiency, the stitching process may not be limited to stitching the currently finished stacking unit on the adjacent stacking unit specifically or on the stacking unit adjacent to the internal interval, as long as the currently finished stacking unit penetrates through a part or the whole of the adjacent stacking unit; each laminated unit is combined with the adjacent laminated unit in an interlayer mode through the sewing line, so that the interlayer combination of all the laminated units is completed, and the interlayer combination strength is improved.

And S5, penetrating and sewing the mold along the sewing grooves, demoulding, and penetrating and sewing the whole thickness direction through the sewing lines 14 to form the antenna cover plate profiling prefabricated member. The mould is provided with a through sewing groove, and the plane part of the mould and the circumferential side surface and the top surface of the bulge are provided with a plurality of through sewing grooves; the stitching along the stitching groove can adopt single-thread stitching, the purpose is to lay layer fixed connection, prevent dislocation or even scattering between the layers laid in the demoulding process, and the penetrating stitching after demoulding can adopt double-thread (upper thread and bottom thread) stitching to improve the binding force between the whole layers of the blank.

The antenna cover plate prefabricated part prepared by the method is formed by paving and distributing continuous fibers on the plane part 11, the peripheral side part 12 and the top surface part 13, compared with the prior art, the continuous size of the fiber cloth is greatly prolonged, and the fiber cloth is stressed in the length direction of the large-size continuous fibers of the fiber cloth under the common condition of stress, but not in interlayer stress, so that the strength and the service performance are greatly improved.

Preferably, the step of adjusting the fiber gap of the fiber cloth on the convex part of the mold to make the fiber cloth fit with the outer surface of the mold further comprises the following steps:

s201, when the size of the whole thickness of all the laid fiber covers at the vertex between the top surface and the peripheral side surface of the convex part of the die is smaller than a preset value;

because the fiber cloth is stretched in the laying process, the position with the largest stress is the top position of the top surface and the peripheral side surface, so that the fiber at the position is easy to generate a gap, the thickness of the fiber is thinner than that of other parts, obvious thickness difference is easy to generate after multilayer laying, and the step S202 is carried out when the thickness difference at a fixed point is smaller than the thickness of one layer of fiber cloth;

s202, paving fiber cloth thickening sheets at the vertexes of the fiber covers between the top surfaces and the peripheral side surfaces of the convex parts of the mold.

The fiber cloth thickening sheet and the laid fiber cloth are made of the same raw materials, the shape can be round, oval, square or irregular, the fiber cloth thickening sheet is used for filling the difference in thickness of the top position caused by stretching, the next layer of fiber cloth is laid at the top position in the laying process, and the thickening sheet laid at the top position can be enclosed between the two layers of fiber covers after the next layer of fiber cloth forms the fiber cover.

Preferably, in an embodiment of the present invention, referring to fig. 3, the mold 100 herein includes a convex portion and a planar portion 101, the convex portion includes an arc-shaped top surface 102 and a peripheral side surface 103 perpendicular to the planar portion 101, the peripheral side surface includes two first peripheral side surfaces 103a and two second peripheral side surfaces 103b in the embodiment, and the first peripheral side surfaces 103a and the second peripheral side surfaces 103b are adjacent and perpendicular to each other.

In other embodiments of the present invention, the peripheral side surface 103 may also be in other shapes, such as a cylinder, an elliptic cylinder, a prism, etc., and the shape of the antenna cover plate profiling preform and the shape of the antenna cover plate are determined according to the shape of the antenna cover plate profiling preform to be prepared, and the convex shape is completely matched with the convex portion of the antenna cover plate profiling preform; the fiber cloth not only forms continuous laying layers on the convex parts and the plane parts, but also forms continuous laying layers on the transverse and longitudinal peripheral side surfaces of the convex parts, so that the extension size of the laying layers is improved, and further the multi-directional bearing performance is improved.

Preferably, the thickness of all the fiber covers laid on the mold is measured by a thickness measuring part, and whether the size of the whole thickness of all the fiber covers at the vertex between the top surface and the peripheral side surface of the convex part of the mold is smaller than a preset value is obtained. The preset value is usually the thickness of a layer of fiber cloth, and is generally about 0.1-0.3 mm; the thickness measuring member herein may be made according to the shape of the preform or the convex portion of the mold, for example: the mould 100 adopts the structure and the shape in fig. 3, the measuring part adopts angle calipers, including two perpendicular planes of standing and the arc top surface that is located between the two planes of standing, the two planes of standing are used for the centre gripping on first week side 103a, the size between two first week side 103a is 100mm, every five layers of fiber cloth of laying forms a range upon range of unit, the thickness of every range upon range of unit is about 1mm, after laying two range upon range of units, adopt angle calipers to measure, the size between the two planes of standing is 102mm, the shape and the size of arc top surface increase 2mm thickness according to the arc top surface size of mould 100 and calculate, with angle calipers card on two first week side 103a, and the difference of the actual thickness of apex and settlement thickness can be observed from both ends opening part after the top surface pastes tightly.

In order to be able to detect the thickness differences at the vertices in the entire laying process for timely supplementation, a plurality of thickness measuring elements can be used for each type of preform product for process detection of different laying layer thicknesses in the laying process. For example, in the above embodiment, each time two stacking units are laid, measurement is performed by using one angle caliper, and when 14 stacking units are laid to reach a preset thickness, seven angle calipers need to be designed, and size and shape of the thicknesses of two stacking units, four stacking units, six, eight, ten, twelve, and fourteen stacking units are designed and calculated, so as to finally obtain a specific structure of the angle caliper.

Preferably, in order to improve the interlayer bonding performance, a plurality of through slots are arranged on the plane part of the die and the circumferential side surface and the top surface of the bulge; the step S3 of repeating the fiber laying and adjusting for a plurality of layers to complete the laying of one stacking unit further includes:

s301, after each lamination unit is formed, penetrating and sewing all the laid lamination units along the thickness direction of the lamination unit along the sewing groove 104 on the mould; the single thread penetrating suture can be adopted, and the suture efficiency is improved.

The step S4 of repeating the laying of the plurality of stacked units until the preset thickness is reached includes:

s401, repeatedly laying the laminating units and sewing the laminating units in the thickness direction of all the laminating units along the wire grooves on the die;

and S402, until the thickness of all the laminated units after being sewn reaches the preset thickness.

The stitching after demoulding can adopt the manual bottom thread and the upper thread to carry out penetration and tensioning stitching. The bottom line and the upper line are in a tensioning state and bear certain tensioning force so as to improve the interlayer bonding force and improve the overall strength of the antenna cover plate prefabricated part.

At this point, the laying of the first stacking unit 1 is completed, and after the laying is completed, the penetrating stitching can be completed through the wire chase 104 on the mold 100; repeating the steps to finish the laying of the second laminated unit 2, and sewing the first laminated unit 1 and the second laminated unit 2 in a penetrating way; repeating the steps to finish the laying of the third laminating unit 3, and sewing the first laminating unit 1, the second laminating unit 2 and the third laminating unit 3 in a penetrating way; repeating the above steps until the laying of the Nth laminated unit N is completed, and stitching the first laminated unit 1, the second laminated unit 2 and the third laminated unit 3 … … to form the Nth laminated unit N; the sewing does not need to be demoulded after the stacking and laying are finished every time, and the preparation efficiency is improved. After demoulding, the wire can be integrally penetrated and sewed according to any shape without being constrained by the shape of the wire groove during sewing in the laying process.

As a second preferred embodiment, the mold comprises a polygonal plane portion and a protrusion located at the center of the plane portion, wherein the protrusion is in a prism structure and comprises a polygonal arc-shaped top surface and a plurality of side surfaces located around the polygonal top surface.

As a third preferred embodiment, the mold comprises a circular plane part 101 and a protrusion located at the center of the plane part, wherein the protrusion has a cylindrical structure.

Preferably, the overall thickness direction after demolding runs through the stitching:

the suture line comprises a bottom line and a surface line, and the surface line passes through a through hole penetrating through the thickness direction of the laminated unit and is wound on the bottom line.

In the mode, the upper thread and the bottom thread are in a tensioning state, and the interlayer bonding performance is better.

Preferably, the sewing step comprises:

laying the bottom line on a line groove on the inner wall of the mold;

the puncture needle with the hook at the bottom is punctured from the wire groove along the thickness direction of the laminating unit, and the hook of the puncture needle extends out of the laminating unit;

hanging the upper thread on a hook and returning along the direction of the pricking pin;

the bottom thread passes through the upper thread ring hung on the hook, and the upper thread is separated from the hook;

pulling the free end of the upper thread to tension the upper thread and the bottom thread, thereby finishing a stitch;

repeating the steps according to the set needle pitch to finish the whole-process sewing of one wire groove;

and repeating the sewing of all the thread grooves to finish the sewing.

Example two

Based on the first embodiment, the embodiment of the present invention further provides an antenna cover plate forming method, including the following steps:

preparing a prefabricated part by the antenna cover plate profiling prefabricated part puncturing method in any embodiment;

clamping two surfaces of the prefabricated part in the thickness direction by using two rigid molds, and adjusting the gap between the two rigid molds according to the control allowance so as to control the thickness of the prefabricated part within a preset range; it should be noted that, in order to obtain a preform with a pre-controlled thickness, the gap between the two rigid molds is adjusted until the preform reaches the pre-controlled thickness, the inner rigid mold is fixed in a common manner, pressure is applied to the outer rigid mold, and when the pre-controlled thickness range is reached, the inner and outer rigid molds are fixed (for example, in a manner of bolt connection and fixation, etc.), and the gap between the inner and outer rigid molds is maintained to control the thickness of the preform;

putting the two rigid molds and the prefabricated member into a dipping tank integrally, vacuumizing the dipping tank until the air pressure is less than or equal to 1000Pa, sucking a water-alcohol solution of tetraethoxysilane or silica sol (sold in the market) into the dipping tank, and submerging the prefabricated member to enable the prefabricated member to be capable of penetrating through the gap between the two rigid molds or the pores of the rigid molds to be in complete contact with the water-alcohol solution of tetraethoxysilane or the silica sol; soaking for 5-12 hours at normal temperature;

The water-alcohol solution of the ethyl orthosilicate is self-made, and the preparation method comprises the following steps:

preparing tetraethoxysilane, deionized water and absolute ethyl alcohol into a homogeneous solution.

According to the antenna cover plate obtained by the method, the fibers of the prefabricated part of the antenna cover plate in all directions are uniform and continuous, and the two directions are uniformly interwoven, so that the phenomenon that the stress of a certain area is unbalanced is avoided, the integral strength and the performance are higher, the antenna cover plate has the same performance, the consumption of raw materials is greatly reduced, the machining cost is saved, and the cost is reduced.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The antenna cover plate profiling prefabricated part puncturing method is characterized by comprising the following steps:

continuously laying a layer of fiber cloth on the outer surface of the mold;

adjusting fiber gaps of the fiber cloth on the raised part of the mold to enable the fiber cloth to be matched with the outer surface of the mold and form a fiber cover; the step of adjusting the fiber gap of the fiber cloth on the convex part of the mould to enable the fiber cloth to be matched with the outer surface of the mould further comprises the following steps: when the size of the whole thickness of all the laid fiber covers at the vertex between the top surface and the peripheral side surface of the convex part of the die is smaller than a preset value; respectively paving fiber cloth thickening sheets at the vertexes of the fiber cover between the top surface and the peripheral side surface of the convex part of the mold;

2. The method for piercing a profiling preform of an antenna cover plate according to claim 1, wherein the thickness of all the fiber covers laid on the mold is measured by a thickness measuring part to obtain whether the dimension of the overall thickness of all the fiber covers at the apex between the top surface and the peripheral side surface of the convex portion of the mold is smaller than a preset value.

3. The method of claim 2, wherein the thickness measuring device comprises a plurality of devices for performing process inspection for different thicknesses of the laid layer during the laying process.

4. The method for puncturing the profiling prefabricated member of the antenna cover plate according to any one of claims 1 to 3, wherein a plurality of through slots are formed on the plane part of the mold and the peripheral side surfaces and the top surfaces of the protrusions; the repeating of the laying and the adjusting of the plurality of layers of fibers further comprises, after the step of completing the laying of one stacking unit:

sewing the line groove on the mould in the thickness direction of the lamination unit;

the step of repeating the laying of the plurality of stacked units until a preset thickness is reached comprises:

after the laminating units are repeatedly laid, the wire grooves on the die penetrate through all the laminating units and are sewn in the thickness direction;

until the stitched thickness of all the laminated units reaches the preset thickness.

5. The method for piercing a contoured preform for an antenna cover plate of claim 4, wherein in the step of stitching prior to demolding:

the sewing line is a single-line penetrating sewing line, and the penetrating thickness is equal to all the laid laminated units.

6. The method for piercing a profiling preform of an antenna cover plate according to claim 5, wherein the whole thickness direction penetrates through the stitching after demoulding:

7. The method of claim 6, wherein the sewing step comprises:

laying the bottom line on a line groove on the inner wall of the mold;

and repeating the sewing of all the thread grooves to finish the sewing.

8. The antenna cover plate forming method is characterized by comprising the following steps:

preparing a prefabricated member by the antenna cover plate profiling prefabricated member puncturing method according to any one of the claims 1-7;

and obtaining the antenna cover plate after the allowance is processed on the molded product.

9. The antenna cover plate forming method of claim 8, wherein the preparation method of the water-alcohol solution of ethyl orthosilicate comprises the following steps: