CN114274544A - Method for preparing composite material reflector by adopting variable curvature mould - Google Patents
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Abstract
A method for preparing a composite material reflector by adopting a variable curvature mould comprises the following steps: obtaining a variable curvature composite material mold; coating a release agent on the variable curvature composite material mold; attaching a composite lay-up to the variable curvature composite mould, the composite lay-up being located above the mould release agent; and coating the composite material layer. The preparation method can reduce the preparation quantity of the die, shorten the preparation time of the die, improve the universality of the die and reduce the preparation cost of the die.
Description
Technical Field
The invention belongs to the technical field of optical element preparation, and particularly relates to a preparation method of a composite material reflector.
Background
The composite material has the characteristics of high specific rigidity, strong designability, good corrosion resistance and the like, so that the composite material becomes one of main base materials for preparing the reflector. At present, the preparation of the composite material reflection is usually obtained by a mode of impressing a high-precision surface of a replica mold, and parameters such as curvature, caliber and the like of a mirror surface correspond to the mold one by one. Different molds are needed for preparing the reflectors with different parameters, the specifications and the models of the reflectors are complicated, a large number of molds are needed, and meanwhile, the machining period of the high-precision mold is long and the machining cost is high.
Disclosure of Invention
Aiming at the problems, the method for preparing the composite material reflector by using the mould is provided, wherein the composite material mould with variable curvature is prepared firstly, and then the curvature of the composite material mould is adjusted to obtain the corresponding curvature of the reflector to be prepared.
The invention provides a method for preparing a composite material reflector by adopting a variable curvature mould, which comprises the following steps:
obtaining a variable curvature composite material mold;
coating a release agent on the variable curvature composite material mold;
attaching a composite lay-up to the variable curvature composite mould, the composite lay-up being located above the mould release agent;
and coating the composite material layer.
According to some embodiments, the obtaining a variable curvature composite mold comprises: preparing an invariable curvature mould; preparing a primary variable curvature composite mold based on the non-variable curvature mold; varying a surface curvature of the primary variable curvature composite mold to obtain a variable curvature composite mold.
According to some embodiments, the preparing the non-variable curvature mold comprises: and determining the curvature radius and the caliber of the mould for preparing the variable-curvature composite material to prepare the non-variable-curvature mould based on the curvature of the reflector made of the composite material to be prepared.
According to some embodiments, the non-variable curvature mold is processed using indium steel, optical glass, or glass-ceramic as a substrate.
According to some embodiments, the preparing a primary variable curvature composite mold based on the non-variable curvature mold comprises: and (3) paving the prepreg on the non-variable curvature mould according to the paving design to prepare the primary variable curvature composite mould.
According to some embodiments, wherein said varying the surface curvature of said primary variable curvature composite mould to obtain a variable curvature composite mould comprises: and a driving device is arranged on the back surface of the primary variable curvature composite material mold, and the driving force of the driving device is adjusted to realize the curvature change of the primary variable curvature mold.
According to some embodiments, further comprising: after a primary variable curvature composite material mold is prepared based on the invariable curvature mold, detecting the surface shape of the primary variable curvature composite material mold to ensure that the surface shape precision of the primary variable curvature composite material mold meets the surface shape precision requirement of a mirror surface of a composite material reflector to be prepared; and/or the presence of a gas in the gas,
after the surface curvature of the primary variable curvature composite material mold is changed to obtain a variable curvature composite material mold, detecting the surface shape precision of the variable curvature composite material mold to ensure that the surface shape precision meets the surface shape precision requirement of a mirror surface of a composite material reflector to be prepared.
According to some embodiments, said applying said composite lay-up over a variable curvature composite mould, said composite lay-up being over said mould release agent, comprises: and (3) paving and pasting the prepreg on the variable-curvature composite material mould according to the laying design, and curing and forming to prepare the composite material reflector blank.
According to some embodiments, wherein the ply design is obtained according to specifications of parameters of a material mirror to be produced.
According to some embodiments, further comprising: and adjusting the surface shape of the reflecting mirror blank until the reflecting mirror blank meets the surface shape requirement by adjusting the curvature and/or the preparation process of the variable curvature composite die.
The invention can obtain the following technical effects:
the invention realizes the purposes of reducing the number of the prepared moulds and shortening the preparation time of the moulds through the variable curvature moulds, improving the universality of the moulds and reducing the preparation cost of the moulds.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiment(s) described hereinafter.
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, and 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 these drawings without creative efforts.
FIG. 1 is a schematic flow chart of an embodiment of the present invention for making a composite mirror;
FIG. 2 is a schematic flow chart of step 101 of the method of FIG. 1 in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of a non-variable curvature composite mold and a primary variable curvature composite mold of an embodiment of the present invention;
FIG. 4 is a schematic view of a pneumatic drive for a variable curvature composite mold in accordance with an embodiment of the present invention;
FIG. 5 is a schematic view of a variable curvature composite mold mirror blank according to an embodiment of the present invention.
Detailed Description
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.
Spatially relative terms such as "below …," "below …," "lower," "below …," "above …," "upper," and the like may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that these spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" or "under" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "below …" and "below …" may encompass both an orientation above … and below …. Terms such as "before …" or "before …" and "after …" or "next to" may similarly be used, for example, to indicate the order in which light passes through the elements. The devices may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. In addition, it will also be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items, and the phrase "at least one of a and B" refers to a alone, B alone, or both a and B.
It will be understood that when an element or layer is referred to as being "on," "connected to," "coupled to" or "adjacent to" another element or layer, it can be directly on, connected to, coupled to or adjacent to the other element or layer or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on," "directly connected to," "directly coupled to," or "directly adjacent to" another element or layer, there are no intervening elements or layers present. However, neither "on … nor" directly on … "should be construed as requiring that one layer completely cover an underlying layer in any event.
Embodiments of the present invention are described herein with reference to schematic illustrations (and intermediate structures) of idealized embodiments of the present invention. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments of the invention should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of the present invention.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and/or the present specification and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The invention provides a method for preparing a composite material reflector by adopting a variable curvature mould, which comprises the following steps as shown in figure 1:
s101, obtaining a variable curvature composite material die;
s102, coating a release agent on the variable-curvature composite material mold;
s103, attaching a composite material layer to the variable-curvature composite material mold, wherein the composite material layer is positioned above the release agent;
and S104, coating the composite material layer.
Because the surface curvature of the variable curvature mould can be changed, the preparation requirements of the reflecting mirror with different curvatures can be met by changing the curvature of the surface of the variable curvature mould without changing the mould, so that the preparation quantity of the mould can be reduced, the preparation time of the mould can be shortened, the universality of the mould can be improved, and the preparation cost of the mould can be reduced.
Although in some scenarios, the curvature of the composite material reflector to be manufactured has a corresponding variable curvature composite material mold, and the composite material reflector to be manufactured can be manufactured by using the manufacturing method shown in fig. 1, in other application scenarios, if there is no corresponding variable curvature composite material mold, the variable curvature composite material mold needs to be installed first.
Corresponding to these application scenarios, according to some embodiments, the step S101 of acquiring a variable curvature composite mold, as shown in fig. 2, includes:
s1011, preparing an invariable curvature mould;
s1012, preparing a primary variable curvature composite material mold based on the non-variable curvature mold;
s1013, changing a surface curvature of the primary variable curvature composite mold to obtain a variable curvature composite mold.
According to some embodiments, S1011, the preparing the non-variable curvature mold comprises: and determining the curvature radius and the caliber of the mould for preparing the variable-curvature composite material to prepare the non-variable-curvature mould based on the curvature of the reflector made of the composite material to be prepared.
Illustratively, the non-variable curvature mold is processed using indium steel, optical glass, or glass-ceramic as a substrate.
According to some embodiments, S1012, the preparing a primary variable curvature composite mold based on the non-variable curvature mold comprises: and (3) paving the prepreg on the non-variable curvature mould according to the paving design to prepare the primary variable curvature composite mould.
According to some embodiments, S1013, the varying the surface curvature of the primary variable curvature composite mold to obtain a variable curvature composite mold comprises: and a driving device is arranged on the back surface of the primary variable curvature composite material mold, and the driving force of the driving device is adjusted to realize the curvature change of the primary variable curvature mold.
According to some embodiments, further comprising: after a primary variable curvature composite material mold is prepared based on the invariable curvature mold, detecting the surface shape of the primary variable curvature composite material mold to ensure that the surface shape precision of the primary variable curvature composite material mold meets the surface shape precision requirement of a mirror surface of a composite material reflector to be prepared; and/or the presence of a gas in the gas,
after the surface curvature of the primary variable curvature composite material mold is changed to obtain a variable curvature composite material mold, detecting the surface shape precision of the variable curvature composite material mold to ensure that the surface shape precision meets the surface shape precision requirement of a mirror surface of a composite material reflector to be prepared.
According to some embodiments, said applying said composite lay-up over a variable curvature composite mould, said composite lay-up being over said mould release agent, comprises: and (3) paving and pasting the prepreg on the variable-curvature composite material mould according to the laying design, and curing and forming to prepare the composite material reflector blank.
Illustratively, the ply design is obtained according to the technical requirements of the parameters of the material reflector to be prepared.
According to some embodiments, further comprising: and adjusting the surface shape of the reflecting mirror blank until the reflecting mirror blank meets the surface shape requirement by adjusting the curvature and/or the preparation process of the variable curvature composite die.
For convenience of understanding, the foregoing embodiments are described in combination with the following embodiments, and it should be noted that the steps and material processes in the following description are detailed for clarity of description, and do not constitute a closed description of the embodiments, nor are the materials and processes necessarily included in other embodiments of the present invention.
In one embodiment, by S1011, a non-variable curvature mold is prepared;
the method comprises the steps of determining external shape technical parameters such as curvature radius, caliber and the like of a die for preparing the variable-curvature composite material based on the curvature of a reflector of the composite material to be prepared, and processing and preparing the die for the variable-curvature composite material by adopting indium steel or optical glass as a base material.
Continuing with S1012, preparing a primary variable curvature composite mold based on the non-variable curvature mold;
the method comprises the steps of finishing composite material laying design optimization according to technical parameter requirements of a variable-curvature composite material mold, paving and pasting prepreg on a non-variable-curvature mold according to laying design, and preparing a primary variable-curvature composite material mold by adopting a vacuum bag process or other composite material molding processes.
Continuing through S1013, changing a surface curvature of the primary variable curvature composite mold to obtain a variable curvature composite mold;
the surface type precision of the variable curvature composite material mold is superior to the surface type precision requirement of a composite material reflector to be processed, a driving device such as air pressure driving or support ring driving is installed on the back of the variable curvature composite material mold and serves as a power mechanism for adjusting curvature, the driving capability of the driving device is adjusted to realize curvature change of the variable curvature mold, the design requirement is met, the surface type precision under different curvatures is detected, and the requirement that the surface type precision is superior to the surface type precision requirement of the composite material reflector to be prepared is met.
And adjusting the prepared composite material mould with the variable curvature to the curvature of the composite material reflector to be prepared, and detecting the surface type.
After obtaining the variable curvature composite mold, the step of preparing the composite mirror may be started, and thus, next, S102 is performed to coat a release agent on the variable curvature composite mold;
execution continues with S103: attaching a composite lay-up to the variable curvature composite mould, the composite lay-up being located above the mould release agent;
the method comprises the steps of finishing composite material laying design optimization according to the technical requirements of parameters of a composite material reflector to be prepared, paving and pasting prepreg on a variable-curvature composite material mold according to the laying design, curing and molding to prepare a composite material reflector blank, detecting the surface type, and if the requirements are not met, adjusting the variable-curvature composite material mold, the preparation process and the like according to the detection result of an interferometer until the surface type requirements are met.
After obtaining the mirror blank satisfying the surface shape requirement, in order to form the "reflection" function of the mirror, S104 is continuously executed: and coating the composite material layer.
And coating the prepared composite material reflector blank, performing final detection, unqualified detection, finding problems, and completing preparation after qualification.
The method for manufacturing the composite material reflector by using the variable curvature mold according to the present invention is described above, and the embodiments of the present invention will be further described with reference to fig. 3 to 5.
In one embodiment, the required parameters of the mirrors to be equipped are as follows: when the effective caliber is 50mm (considering the edge effect, the caliber of the reflector is prepared according to 60 mm), the curvature radius is 100mm, the thickness is 4mm, and the reflector is applied to the long-wave infrared concave carbon fiber composite reflector.
Based on the aforementioned preparation methods, the preparation steps are exemplarily listed as follows:
and S1011, preparing an invariable curvature mould. And determining the technical parameters of the shape such as curvature radius, caliber and the like of the mold for preparing the variable-curvature composite material based on the curvature of the reflector of the composite material to be prepared, and processing the base material to prepare the mold with the invariable curvature.
Specifically, the effective caliber of the composite material reflector to be prepared is 50mm, the curvature is 100mm, and the basic parameters of the non-variable curvature mould for preparing the variable curvature composite material mould are determined to be 60mm, 100mm of curvature radius and 20mm of thickness.
Considering the edge effect of the composite material, namely the composite material often has edges, the caliber is set to be 50mm +10mm and 60mm, the diameter-thickness ratio is selected to be 3-5: 1 according to the specific rigidity and the thermal expansion coefficient of the material of the die, and the thickness is 20-12 mm because the caliber is 60mm, so that the requirement that the pressure deformation is smaller than the surface accuracy in the processes of heating and forming the composite material is met.
Illustratively, the non-variable curvature mold is processed using indium steel, optical glass, or glass-ceramic as a substrate.
In consideration of the application scenario, as shown in fig. 3, the substrate is processed and prepared into a concave mold 320 with an invariable curvature, and in order to ensure the mold accuracy, the surface type accuracy of the processed mold needs to be detected.
Illustratively, the face type accuracy is related to the application scene of the reflector, and the face type accuracy of the non-variable curvature mold is better than 1/40 lambda, for example, when the reflector is applied to a long-wave infrared band of 10.6 mu m, the face type accuracy of the non-variable curvature mold is better than 1/40 lambda, namely 265 nm.
S1012, preparing a primary variable curvature composite material mold based on the non-variable curvature mold;
the composite material laying design optimization is completed according to the technical parameter requirements of the variable-curvature composite material mold, the prepreg is laid and attached to the non-variable-curvature mold according to the laying design, and the variable-curvature composite material mold is prepared by adopting a vacuum bag process or other composite material molding processes.
Illustratively, as shown in fig. 3, based on the classical laminated board theory and the technical parameters of the variable curvature mold, such as the radius of 100mm, the caliber of 60mm, the thickness of 2mm, etc., completing the ply design of the variable curvature composite material mold [ 09045-45 ]3S, paving the ply design on the surface of the non-variable curvature mold, adopting the vacuum bag process to prepare the convex primary variable curvature mold mirror blank 310, and detecting the surface type precision of the convex primary variable curvature mold mirror blank to be better than 1/35 λ (λ is 10.6 μm), such as 302nm, otherwise, if the surface type precision does not meet the requirement, repeating S1012 until the surface type precision requirement is met.
Illustratively, the composite prepreg may be M40, T300, T600, T700, or T800.
Illustratively, the primary composite mold 310 is prepared using a vacuum bag preparation process, an RTM process, or a compression molding process.
S1013, changing a surface curvature of the primary variable curvature composite mold to obtain a variable curvature composite mold.
As shown in fig. 4, an annular pneumatic deformable housing is bonded to the back surface of the mirror blank of the variable curvature mold, and the amount of air between the back surface of the variable curvature mold and the annular pneumatic deformable housing is controlled by an air inlet 430, so that the generated air pressure change can change the curvature radius of the convex variable curvature mold, for example, the curvature radius is changed within a range of 95mm-110mm, and the surface type is detected by a long-wave infrared interferometer and is better than 1/35 lambda (lambda is 10.6 mu m), for example, 302nm, otherwise, S1012 and S1013 are repeated until the requirement is met.
The convex variable curvature mold 410 was continuously adjusted to maintain the air pressure at 1 atmosphere so that the radius of curvature thereof was 100mm, and the surface type thereof was examined, and it was required to be superior to 1/35 λ (λ ═ 10.6 μm) and to coat the release agent on the high-precision surface thereof for use.
Next, according to the requirements of the effective aperture of 50mm, the curvature radius of 100mm and the thickness of 4mm to be prepared, based on the classical laminate theory, determining the layer to be [ 09045-45 ]6s, paving the layer on the surface of the convex variable curvature mold 510 according to the layer design, curing at room temperature, preparing the mirror blank 540 to be prepared, and detecting the surface type, wherein the surface type is better than 1/30 lambda (lambda is 10.6 μm), and the air inlet 530 is also shown in the figure.
And then, coating a reflecting film on a mirror blank with the aperture of 60mm, the curvature radius of 100mm and the thickness of 4mm, detecting the surface type by using a long-wave infrared interferometer, wherein the surface type precision is better than 1/30 lambda (lambda is 10.6 mu m), and the mirror blank is unqualified, is searched for problems and is qualified to finish the preparation of the mirror.
Based on the completion of the foregoing embodiments, when the next mirror preparation requirement is: when the effective caliber is 50mm (considering the edge effect, the caliber of the reflector is prepared according to 60 mm), the curvature radius is 105mm, the thickness is 6mm, and the reflector is applied to the long-wave infrared concave carbon fiber composite reflector.
Considering that the variable curvature composite material reflector mold is already manufactured, as shown in fig. 4, for the requirement of the manufacturing, only the curvature radius of the convex variable curvature mold shown in fig. 4 needs to be changed and adjusted to 105mm through air pressure, the ply is changed to [ 09045-45 ]9s, and the rest of the steps are performed according to corresponding steps, which is not described herein again.
The radius of the reflector mould made of the variable curvature composite material is changed from 100mm in the previous use to 105mm in the current use, the preparation of the reflector is completed, a new reflector mould is not required to be prepared in the process, and the curvature radius of the reflector mould is directly changed by using the previous use mould to obtain the new reflector mould.
Therefore, the curvature of the surface of the variable curvature mould can be changed, so that the preparation requirements of the reflectors with different curvatures can be met by changing the curvature of the surface of the variable curvature mould without changing the mould, the preparation quantity of the moulds can be reduced, the preparation time of the moulds can be shortened, the universality of the moulds can be improved, and the preparation cost of the moulds can be reduced.
Illustratively, the variable curvature molds mentioned in the present disclosure have a surface curvature varying in the range of 95mm to 110mm, and the molds do not need to be replaced as long as the curvature of the mirror to be produced is in the aforementioned range.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
The above embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A method of making a composite mirror using a variable curvature mold, the method comprising the steps of:
obtaining a variable curvature composite material mold;
coating a release agent on the variable curvature composite material mold;
attaching a composite lay-up to the variable curvature composite mould, the composite lay-up being located above the mould release agent;
and coating the composite material layer.
2. The method of making a composite mirror using a variable curvature mold of claim 1, wherein said obtaining a variable curvature composite mold comprises:
preparing an invariable curvature mould;
preparing a primary variable curvature composite mold based on the non-variable curvature mold;
varying a surface curvature of the primary variable curvature composite mold to obtain a variable curvature composite mold.
3. The method of making a composite mirror using a variable curvature mold of claim 2, wherein said making an invariable curvature mold comprises:
and determining the curvature radius and the caliber of the mould for preparing the variable-curvature composite material to prepare the non-variable-curvature mould based on the curvature of the reflector made of the composite material to be prepared.
4. The method of manufacturing a composite mirror using a variable curvature mold according to claim 2, wherein the non-variable curvature mold is processed using indium steel, optical glass, or glass ceramics as a substrate.
5. The method of making a composite mirror using a variable curvature mold of claim 2, wherein making a primary variable curvature composite mold based on the non-variable curvature mold comprises:
and (3) paving the prepreg on the non-variable curvature mould according to the paving design to prepare the primary variable curvature composite mould.
6. The method of making a composite mirror using a variable curvature mold of claim 2, wherein said varying the surface curvature of said primary variable curvature composite mold to obtain a variable curvature composite mold comprises:
and a driving device is arranged on the back surface of the primary variable curvature composite material mold, and the driving force of the driving device is adjusted to realize the curvature change of the primary variable curvature mold.
7. The method of making a composite mirror using a variable curvature mold of claim 2, further comprising:
after a primary variable curvature composite material mold is prepared based on the invariable curvature mold, detecting the surface shape of the primary variable curvature composite material mold to ensure that the surface shape precision of the primary variable curvature composite material mold meets the surface shape precision requirement of a mirror surface of a composite material reflector to be prepared; and/or the presence of a gas in the gas,
after the surface curvature of the primary variable curvature composite material mold is changed to obtain a variable curvature composite material mold, detecting the surface shape precision of the variable curvature composite material mold to ensure that the surface shape precision meets the surface shape precision requirement of a mirror surface of a composite material reflector to be prepared.
8. The method of making a composite mirror using a variable curvature mold of claim 1, wherein applying the composite layup to the variable curvature composite mold, the composite layup being positioned over the mold release agent, comprises:
and (3) paving and pasting the prepreg on the variable-curvature composite material mould according to the laying design, and curing and forming to prepare the composite material reflector blank.
9. The method of manufacturing a composite mirror using a variable curvature mold of claim 8, wherein the ply design is obtained according to specifications for parameters of a material mirror to be manufactured.
10. The method of making a composite mirror using a variable curvature mold of claim 8 or 9, further comprising:
and adjusting the surface shape of the reflecting mirror blank until the reflecting mirror blank meets the surface shape requirement by adjusting the curvature and/or the preparation process of the variable curvature composite die.
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