CN112861244A - Integral wallboard unfolding method based on layered thickness - Google Patents
Integral wallboard unfolding method based on layered thickness Download PDFInfo
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Abstract
The invention discloses a method for unfolding an integral wallboard based on layered thickness, which comprises the following specific steps of: step S1, simplifying the structure on the wall plate to obtain a regular integral wall plate structure; step S2, partitioning the simplified integral wall plate structure according to the thickness of each structure and the boundary line of each structure on the simplified integral wall plate along the rolling direction during processing to obtain a plurality of large partitions; in each large partition, dividing according to the thickness of each structure in each large partition to obtain small partitions, wherein the wall plate in each small partition is an equal-thickness plate; step S3, determining an initial pressing line; step S4, calculating the neutral plane of the wall plate of each small partition, and then expanding the wall plate by taking the neutral plane as a reference to obtain an expanded surface of the small partition; step S5, splicing the expansion surface of each small partition in sequence along the rolling direction by taking the initial downward pressing line as a reference to obtain the expansion surface of each large partition; and step S6, connecting the two adjacent large subareas to obtain an unfolded structure of the integral wall plate.
Description
Technical Field
The invention relates to the technical field of aircraft wallboards, in particular to a method for unfolding an integral wallboard based on layered thickness.
Background
Modern large-scale aircraft fuselage wallboard generally adopts large-size whole wallboard to replace traditional truss as load-bearing structure to lighten fuselage weight and improve the reliability of the whole structure. Generally, the wall plate is formed by rolling, and the wall plate can be expanded due to deformation in the plate in the forming process. Different from the uniform-thickness wall plate, the integral wall plate has the advantages that the extension rates of all parts are consistent, the thickness of each structural part is inconsistent, the extension rates of all parts are inconsistent, and the forming and unfolding complexity is greatly increased.
General simulation software expands a curved surface into a plane by utilizing the principle of equal area, and for the equal-thickness wall plate, only a neutral surface needs to be simply searched for expansion, so that the required expansion surface can be obtained. For the integral wall plate, due to the fact that the thicknesses of all structural parts are different, the unfolding neutral surfaces of all the structural parts are not located at the same thickness position, and therefore the unfolding neutral surfaces are difficult to find. Aiming at the problem that the whole wallboard is difficult to unfold, the traditional solution is to pre-estimate a thickness position as a uniform unfolded neutral surface according to experience, then carry out a forming test, compare a test measurement result with a design, continuously adjust the position of the unfolded neutral surface according to experience, continuously carry out the test, and finally reach an allowable error range according to the test result.
The conventional solution has three distinct disadvantages: firstly, the neutral plane is estimated according to experience, and the experience is often insufficient for different structures such as integral wall plates, rib opening frames and the like; secondly, a large number of tests are needed to correct the neutral plane, and especially when the position difference between the initial neutral plane estimated and the ideal uniform neutral plane is large, more tests are needed to obtain the position of the ideal uniform neutral plane; thirdly, even if a more ideal uniform neutral plane is obtained, the problem that the local forming precision cannot meet the requirement due to inconsistent local structure elongation rate also exists.
Disclosure of Invention
The invention aims to provide an integral wallboard unfolding method based on layered thickness so as to obtain an integral wallboard unfolding surface, reduce forming errors and reduce production cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
the method for unfolding the integral wallboard based on the layered thickness comprises the following specific steps of:
step S1, simplifying the structure on the wall plate to obtain a regular integral wall plate structure;
step S2, partitioning the simplified integral wall plate structure according to the thickness of each structure and the boundary line of each structure on the simplified integral wall plate along the rolling direction during processing to obtain a plurality of large partitions;
in each large partition, dividing according to the thickness of each structure in each large partition to obtain small partitions, wherein the wall plate in each small partition is an equal-thickness plate;
step S3, determining an initial pressing line;
step S4, calculating a neutral plane of the wall plate of each small partition, and then expanding the wall plate by taking the neutral plane as a reference to obtain an expanded plane of the small partition;
step S5, splicing the expansion surface of each small partition in sequence along the rolling direction by taking the initial downward pressing line as a reference to obtain the expansion surface of each large partition;
and step S6, connecting two adjacent large subareas to obtain an unfolded structure of the integral wall plate.
Preferably, the step S5 and the step S6 further include: and step S56, the final pressing position contour of each large partition is filled with excess materials.
Preferably, the method of expanding a monolithic wallboard based on layered thickness further comprises:
step S7: re-modeling the unfolded structure of the unitary panel obtained in step S6, and re-establishing the simplified structure of step S1 on the unfolded structure;
a machining allowance of a predetermined size is reserved for each of the press-up ends of the unfolded structure of the unitary panel in step S6.
Preferably, the step S1 includes simplifying the fillet, chamfer, rib and weld structure on the integral wall panel.
Preferably, the step S2 includes: and the structure lines of all structures on the wall plate parallel to the rolling direction are overlapped with the boundary line of the large partition.
Preferably, the step S2 further includes: the boundary line of the small sub-area coincides with the structure line of each structure on the wall plate.
Preferably, the step S3 includes:
step S31, assuming that the initial pressing produces material hardening due to plastic deformation so that the subsequent deformation will all expand towards the undeformed region;
and step S32, the initial pressing lines of all the large partitions are a straight line.
Preferably, the step S3 further includes:
at step S33, assume that the initial push-down line is at the equal thickness position of the unfolded configuration at step S6 and on the side of the overall panel where the wall thickness is thick.
Preferably, the calculating the neutral plane of the wall panel of each of the small partitions in step S4 includes: assuming that the mould is only applied to one of the sub-sectors at each forming time, each forming of the wall plate in the sub-sector is assumed to be a roll forming of an equal thickness plate.
Preferably, the step S6 includes: and at least one connection mode of a plane formed by cubic spline curves, a curved surface formed by two sections of circular arcs or a plane formed by straight line splicing is adopted between two adjacent large subareas.
Preferably, the two adjacent large partition boundariesWhen the plane connection formed by straight line splicing is adopted, the splicing angle beta is ensured to be less than beta0Splicing distance in the direction perpendicular to the rolling direction
Wherein, the ratio of beta: splicing angles generated when the boundaries of two adjacent large partitions are spliced by straight lines are adopted; beta is a0To a predetermined angle, beta0Determined by the tolerance of the machining.
Δ L: and the dislocation distance is generated by dislocation of the boundaries of the small partitions after the two adjacent large partitions are unfolded.
The invention has the beneficial effects that: according to the method, the detailed structure on the wall plate is simplified, a regular integral wall plate is obtained to reduce the expansion workload, then the integral wall plate is divided into large subareas according to the thickness and the boundary line of each structure on the wall plate, and then each large subarea is divided into small subareas according to the thickness of each structure in each large subarea. Each divided small partition is regarded as an equal-thickness plate, so that the neutral surface of each small partition can be determined, each small partition in the same large partition is sequentially spliced along the rolling direction by taking the initial downward pressing line as a reference to obtain the unfolded surface of each large partition, and then the two adjacent large partitions are connected to obtain the unfolded structure of the whole wallboard. This approach avoids the process of having to determine a neutral plane of the unitary panel when determining the deployed configuration and does not require a purely worker-dependent experience in solving the deployment problem.
In addition, the structure size of each small partition determined by the method is accurate, so that the size of the whole unfolding structure is accurate, the error of the formed wall plate compared with the design is small, the test workload is reduced, the production efficiency is improved, and the test cost is reduced. And local forming precision can not meet the requirement due to inconsistent local structure extension rate.
Drawings
FIG. 1 is a schematic structural view of the unitary wall panel of the present invention;
FIG. 2 is a simplified structural view of the integral panel of the present invention with large and small partitions;
FIG. 3 is a schematic representation of the curved neutral plane of two successive sub-divisions of the present invention;
FIG. 4 is a schematic diagram of three ways of the inventive staggered contour stitching;
FIG. 5 is a graph showing the effect of splicing the dislocation profiles of the integral wall panels of the present invention;
fig. 6 is a schematic view of the present invention after splicing of the monolithic panels with allowance.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements to be referred to must have specific orientations, be constructed in specific orientations, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
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 the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
The specific implementation object of the present embodiment is as shown in fig. 1, and is an inner structure of a monolithic wall panel, that is, a surface of the wall panel of an aircraft, in which the thickness of the wall panel varies, is on the inner side of the wall panel, and the thickness variation of the wall panel is similar to a step structure. The wall plate in the embodiment comprises four thicknesses, the thickness distribution is shown in figure 1, the total side length is 700mm after the wall plate is unfolded, each weight reducing frame opening is provided with a fillet with the diameter of 20mm, and fillet transition with the radius of 0.5mm is arranged in the thickness direction.
In the prior art, a curved surface is generally unfolded into a plane by using simulation software, and the simulation software is based on the principle of equal area. It is difficult to determine a suitable neutral plane for monolithic panels of non-uniform thickness and therefore the results obtained after deployment are often inaccurate. The traditional solution is to estimate a thickness position as a uniform unfolded neutral plane according to experience, then perform a forming test, compare a test measurement result with a design, continuously adjust the position of the unfolded neutral plane according to experience, and continuously perform the test until a final test result reaches an allowable error range. Problems in conventional solutions: firstly, the problem of insufficient experience occurs to different structures such as integral wallboards, rib opening frames and the like; secondly, the proper position of the neutral surface can be determined only by correcting the neutral surface through a large number of tests, so that the workload is large, the working efficiency is low, the test cost is high, and the production cost is further high; thirdly, even if a more ideal uniform neutral plane is obtained, the problem that the local forming precision cannot meet the requirement due to inconsistent local structure elongation rate also exists.
In order to more accurately obtain the expansion surface of the whole wall panel and reduce the forming error, the embodiment provides a method for expanding the whole wall panel based on the layered thickness, which is applied to the specific implementation objects, and the expansion amount of each local structure is accurately estimated by respectively expanding each local structure, so that the whole expansion amount is accurately controlled. The specific steps are shown in fig. 1 and fig. 2, and include:
step S1, simplifying the structure to obtain a regular integral wallboard structure; in step S1, the simplifying structure includes simplifying the structure of each structure on the wall plate and the outer contour of the entire wall plate, so as to obtain a regular integral wall plate structure. Specifically, since the local fine fillets, chamfers, ribs, and welded structures (weld grooves, reinforcing ribs, reinforcing plates) have little influence on the deformation generated by the forming of the entire panel, but the unfolding complexity is greatly increased, and therefore, simplification is required. Aiming at the specific implementation objects, the wall plate in fig. 1 is provided with an A weight reducing opening frame, a B weight reducing opening frame and a C weight reducing opening frame, and the depths of the A weight reducing opening frame, the B weight reducing opening frame and the C weight reducing opening frame can be different. Simplified and removed 20mm round corners of each weight reducing opening frame and 0.5mm transition round corners at the edge of each weight reducing opening frame. As shown in fig. 2, the shapes and thicknesses of the weight-reducing opening frame structures are regular, so that the calculation of the later-stage structure partition and the expansion structure is facilitated.
And step S2, the direction shown by the arrow in FIG. 2 is the processing rolling direction, and the simplified integral wall plate structure is structurally partitioned according to the thickness of each structure and the boundary line of each structure on the simplified integral wall plate along the processing rolling direction to obtain a plurality of large partitions. In each large subarea, small subareas are obtained by dividing according to the thickness of each part structure in each large subarea, the wall plates in each small subarea are equal-thickness plates, and the wall plates of two adjacent small subareas are not necessarily the same in thickness.
After the division in step S2, the structure lines of the respective structures on the wall plate parallel to the rolling direction coincide with the boundary lines of the large division. The boundary lines of the small sub-zones coincide with the structure lines of the individual structures on the wall panel.
According to the thickness and the position of the boundary line of the A lightening opening frame, the B lightening opening frame and the C lightening opening frame on the simplified integral wall plate, the left boundary line of the A lightening opening frame and the B lightening opening frame are overlapped, and the right boundary line of the B lightening opening frame and the right boundary line of the C lightening opening frame are overlapped. As shown in fig. 2, the partition is divided into 5 large partitions, namely a first large partition, a second large partition, a third large partition, a fourth large partition and a fifth large partition, which are respectively represented as a 1-partition, a 2-partition, a 3-partition, a 4-partition and a 5-partition in fig. 2. The boundary line between the first large partition and the second large partition is coincided with the left boundary line of the A weight reducing port frame and the left boundary line of the B weight reducing port frame, the boundary line between the second large partition and the third large partition is coincided with the right boundary line of the A weight reducing port frame, the boundary line between the third large partition and the fourth large partition is coincided with the left boundary line of the C weight reducing port frame, and the boundary line between the fourth large partition and the fifth large partition is coincided with the right boundary line of the B weight reducing port frame and the right boundary line of the C weight reducing port frame. The first and fifth large partitions have the same structure and only need to be calculated once. Then, in the large partition, dividing according to the thickness of each structure to obtain small partitions, wherein the boundary lines of the small partitions are overlapped with the boundary lines of the structures, and marking the boundary lines of the small partitions, such as the boundary lines of the small partitions in the second large partition in fig. 2 are respectively C0, 2-C1, 2-C2 and 2-C3; 2-C4 and 2-C5, wherein C0, C1, C2, C4 and C5 are respectively marked points of the boundary of the small partition in the large partition.
In other embodiments, the structure of the first large partition and the fifth large partition may not be consistent, in which case one more calculation would be required. Further, if the left boundary lines of the a weight reducing port frame and the B weight reducing port frame do not coincide with each other, it is necessary to increase a large division in accordance with the boundary line between the two. Similarly, if the right boundary lines of the B weight reducing port frame and the C weight reducing port frame do not coincide, a large partition needs to be added.
In step S3, an initial down-pressure line is determined. When the initial pressing line is determined, the material is supposed to be hardened due to plastic deformation of the pressing position under the initial pressing, so that the subsequent deformation tends to expand towards the deformation area, when the initial pressing position reaches a certain plastic deformation, the material is hardened more, and the subsequent deformation completely expands towards the undeformed area, so that the initial pressing lines of all the large partitions are not distorted and are positioned on the same straight line. Meanwhile, in order to ensure a sufficient amount of plastic deformation at the initial push-down line, it is assumed that the initial push-down line is at the equal thickness position of the unfolded structure in step S6 and at the side of the entire panel where the wall thickness is thick.
And step S4, calculating the neutral plane of the wall plate of each small subarea, and then unfolding the wall plate by taking the neutral plane as a reference to obtain the unfolded plane of the small subarea.
And step S5, splicing the expanded surfaces of each small partition in sequence along the rolling direction by taking the initial downward pressing line as a reference to obtain the expanded surface of each large partition.
Calculating the neutral plane of the wall panel of each sub-section in step S4 includes: each forming of the wall panel in the cell is assumed to be a roll forming of equal thickness panels, assuming that the mould is only applied to one cell at each forming moment. When the forming bending curvature is determined, the neutral plane of the thickness structure can be calculated according to the bending neutral plane theory of the equal-thickness plate. Then, the neutral plane is used as a reference plane for expansion, and the expansion plane of the small subarea can be obtained. And sequentially splicing the expansion surfaces of each small subarea by taking the initial downward pressing line as a reference, thus obtaining the initial expansion surface of the large subarea.
Specifically, as shown in fig. 2, the wall plate of each small partition in the large partition is an equal-thickness plate, so that the bending of the wall plate in the small partition can be regarded as equal-thickness plate bending. As shown in fig. 3, knowing the outer surface radius and the sheet thickness, the radius of the neutral plane can be calculated from the equal thickness sheet bending theory as:
wherein rho i is the radius of a neutral surface of each cell;
rithe radius of each small subarea and the inner surface;
r is a uniform outer surface radius;
tithe wall thickness of each small partition.
According to the unchanged length before and after the neutral plane is formed, the expansion length of the small subarea in the bending direction can be calculated:
the distance between the demarcation mark point and the pressing starting end can be calculated as follows:
the calculation results are shown in the following table, in mm:
TABLE 1 Small partition Profile Mark Point location
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| L1 | 522.5505 | 69.6734 | 313.5303 | 69.6734 | 522.5505 |
| L2 | -- | 209.0901 | 453.017 | 243.988 | -- |
| L3 | -- | 313.6003 | 522.6904 | 313.6614 | -- |
| L4 | -- | 453.0869 | -- | 453.1481 | -- |
| L5 | -- | 522.7603 | -- | 522.8215 | -- |
And step S56, the final pressing position contour of each large partition is filled with excess materials. The contour line positions of the final pressing positions of each large partition are not in the same straight line, and the contour lines are supplemented in a surplus material mode. The large partition is parallel to the rolling die direction and can be considered not to be deformed, so the length of the direction can be designed.
And step S6, connecting the two adjacent large subareas to obtain an unfolded structure of the integral wall plate. Local structures in small partitions of two or more large partitions may cause dislocation of the contour lines of the trans-regional structures because the thicknesses of other small partition structures of different large partitions are not consistent. In this embodiment, as shown in fig. 4 and 5, fig. 4 is a schematic diagram of a cross-sectional structure of a central layer between two adjacent large partitions. The location indicated by H in fig. 5 is the splice.
Specifically, the B weight-reducing opening frame and the adjacent area without the weight-reducing opening frame structure are located in the small subareas of the large subareas, and the cross-area structure contour lines are dislocated due to the fact that the thicknesses of the small subareas of different large subareas are different. For the dislocated contour, there are three connection modes, one is, as shown in A in FIG. 41And (3) splicing the contour lines of the structural expansion surface by adopting a cubic spline curve in a reasonable range of the dislocation ends of the two contour lines so as to ensure the second-order continuity of the formed contour lines. Secondly, as shown in A in FIG. 42Shown inTwo sections of circular arcs are adopted for connection, so that first-order continuity can be guaranteed. Thirdly, as in A of FIG. 43As shown, the straight line direct connection is adopted, zero-order continuity can be guaranteed, and when the angle of the folding line is small, the influence on the whole forming can be ignored. The complexity of the three connection modes is gradually reduced.
When the plane formed by straight line splicing is connected between the boundaries of two adjacent large partitions, the splicing angle beta is required to be ensured to be in a reasonable range, so that a reasonable splicing length D is required to be selected:
β＜β0
wherein, the ratio of beta: splicing angles generated when the boundaries of two adjacent large partitions are spliced by straight lines are adopted; beta is a0To a predetermined angle, beta0Determined by the tolerance of the machining error, and generally, the larger the tolerance of the machining error is, the beta0The larger the profile length D is, the shorter the profile length D is influenced by the corresponding staggered splicing;
Δ L: and the dislocation distance is generated by dislocation of the boundaries of the small partitions after the two adjacent large partitions are unfolded.
The requirement of the inequality can be met by taking beta as 1 degree and D as 10mm for all dislocation profiles. The final splicing effect is shown in fig. 5.
Step S7: the unfolded structure of the integral panel obtained in step S6 is re-modeled, and the simplified structure in step S1 is re-established on the unfolded structure. The position indicated by F shown in fig. 6 is a reserved working margin, and a working margin of a predetermined size is reserved for each of the press-up ends of the developed structure of the unitary panel in step S6.
Specifically, the expanded structure is reconstructed according to the partition outline of the expanded structure, and the simplified structure is modeled again on the expanded structure by using the characteristic size of the simplified structure, such as a simplified fillet, which is reconstructed on the corresponding expanded structure by directly using the fillet diameter. The end that ends all need to leave sufficient processing allowance under pushing down of expansion part guarantees that the end of pushing down initially can have sufficient plastic deformation and prevents to push down the line and take place the distortion, guarantees to push down and to stop the end and can have sufficient surplus and supply the parallel and level cutting of the inhomogeneous extension of each big subregion, guarantees that the woollen has regular shape. The length of the excess material on the two sides of the embodiment in the bending direction is 50 mm.
In this embodiment, the method is used to simplify the local detailed structure on the wall panel, so as to obtain a regular integral wall panel to reduce the expansion workload, and then the integral wall panel is divided into large partitions according to the thickness and boundary line of each structure on the wall panel, and then each large partition is divided into small partitions according to the thickness of each structure in each large partition. Each small partition after being divided is an equal-thickness plate, so that the neutral surface of each small partition can be determined, each small partition in the same large partition is sequentially spliced along the rolling direction by taking the initial pressing line as a reference to obtain the unfolded surface of each large partition, and then the two adjacent large partitions are connected to obtain the unfolded structure of the whole wallboard. This method does not require the necessity of selecting a neutral plane of the entire panel and does not require the mere reliance on the experience of the operator to solve the problem of unfolding of the panel, and is applicable to unfolding of panels having a structure different from that of the present embodiment, and can be applied to a wide range of panel-like structures having a varying thickness. The method in the embodiment is programmed and then input into a computer, and the expansion of different types of wallboards can be processed by utilizing a program.
In addition, the structure size of each small partition determined by the method is accurate, so that the size of the whole unfolding structure is accurate, the error of the formed wall plate compared with the design is small, the test workload is reduced, the production efficiency is improved, and the test cost is reduced. And local forming precision can not meet the requirement due to inconsistent local structure extension rate.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (11)
1. A method for unfolding an integral wallboard based on layered thickness is characterized by comprising the following specific steps of:
step S1, simplifying the structure on the wall plate to obtain a regular integral wall plate structure;
step S2, partitioning the simplified integral wall plate structure according to the thickness of each structure and the boundary line of each structure on the simplified integral wall plate along the rolling direction during processing to obtain a plurality of large partitions;
in each large partition, dividing according to the thickness of each structure in each large partition to obtain small partitions, wherein the wall plate in each small partition is an equal-thickness plate;
step S3, determining an initial pressing line;
step S4, calculating a neutral plane of the wall plate of each small partition, and then expanding the wall plate by taking the neutral plane as a reference to obtain an expanded plane of the small partition;
step S5, splicing the expansion surface of each small partition in sequence along the rolling direction by taking the initial downward pressing line as a reference to obtain the expansion surface of each large partition;
and step S6, connecting two adjacent large subareas to obtain an unfolded structure of the integral wall plate.
2. The layered thickness-based unitary panel deployment method of claim 1, further comprising, between steps S5 and S6: and step S56, the final pressing position contour of each large partition is filled with excess materials.
3. The layered thickness-based unitary wallboard deployment method of claim 1, further comprising:
step S7: re-modeling the unfolded structure of the unitary panel obtained in step S6, and re-establishing the simplified structure of step S1 on the unfolded structure;
a machining allowance of a predetermined size is reserved for each of the press-up ends of the unfolded structure of the unitary panel in step S6.
4. The layered thickness-based unitary panel unfolding method of claim 1, wherein said step S1 comprises simplifying fillets, chamfers, ribs and weld structures on the unitary panel.
5. The layered thickness-based monolithic wallboard deployment method of claim 1, wherein said step S2 comprises: and the structure lines of all structures on the wall plate parallel to the rolling direction are overlapped with the boundary line of the large partition.
6. The layered thickness-based unitary panel expansion method of claim 5, wherein said step S2 further comprises: the boundary line of the small sub-area coincides with the structure line of each structure on the wall plate.
7. The layered thickness-based monolithic wallboard deployment method of claim 1, wherein said step S3 comprises:
step S31, assuming that the initial pressing produces material hardening due to plastic deformation so that the subsequent deformation will all expand towards the undeformed region;
and step S32, the initial pressing lines of all the large partitions are a straight line.
8. The layered thickness-based unitary panel expansion method of claim 7, wherein said step S3 further comprises:
at step S33, assume that the initial push-down line is at the equal thickness position of the unfolded configuration at step S6 and on the side of the overall panel where the wall thickness is thick.
9. The layered thickness-based unitary panel deployment method of claim 1, wherein calculating the neutral plane of each of said sub-segmented panels in step S4 comprises: assuming that the mould is only applied to one of the sub-sectors at each forming time, each forming of the wall plate in the sub-sector is assumed to be a roll forming of an equal thickness plate.
10. The layered thickness-based monolithic wallboard deployment method of claim 1, wherein said step S6 comprises: and at least one connection mode of a plane formed by cubic spline curves, a curved surface formed by two sections of circular arcs or a plane formed by straight line splicing is adopted between two adjacent large subareas.
11. The method of claim 10, wherein the splice angle β < β is guaranteed when the boundaries of two adjacent macrozones are connected by a plane formed by straight splicing0Splicing distance in the direction perpendicular to the rolling direction
Wherein, the ratio of beta: splicing angles generated when the boundaries of two adjacent large partitions are spliced by straight lines are adopted; beta is a0To a predetermined angle, beta0Determined by the tolerance of the machining.
Δ L: and the dislocation distance is generated by dislocation of the boundaries of the small partitions after the two adjacent large partitions are unfolded.
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