CN112861244B - Integral wallboard unfolding method based on layering thickness - Google Patents
Integral wallboard unfolding method based on layering thickness Download PDFInfo
- Publication number
- CN112861244B CN112861244B CN201911192002.4A CN201911192002A CN112861244B CN 112861244 B CN112861244 B CN 112861244B CN 201911192002 A CN201911192002 A CN 201911192002A CN 112861244 B CN112861244 B CN 112861244B
- Authority
- CN
- China
- Prior art keywords
- wallboard
- partition
- thickness
- unfolding
- small
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005192 partition Methods 0.000 claims abstract description 104
- 230000007935 neutral effect Effects 0.000 claims abstract description 38
- 238000003825 pressing Methods 0.000 claims abstract description 30
- 238000005096 rolling process Methods 0.000 claims abstract description 20
- 238000012545 processing Methods 0.000 claims abstract description 5
- 238000000638 solvent extraction Methods 0.000 claims abstract description 5
- 238000003754 machining Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 238000012360 testing method Methods 0.000 description 15
- 238000005452 bending Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Load-Bearing And Curtain Walls (AREA)
Abstract
The invention discloses an integral wallboard unfolding method based on layered thickness, which comprises the following specific steps: step S1, simplifying the structure on the wallboard to obtain a regular integral wallboard structure; s2, partitioning the simplified integral wallboard structure according to the thickness of each structure and boundary lines of each structure on the simplified integral wallboard along the rolling direction during processing to obtain a plurality of large partitions; dividing the thickness of each structure in each large partition into small partitions in each large partition, wherein the wall plates in each small partition are equal-thickness plates; step S3, determining an initial pressing line; s4, calculating the neutral surface of the wallboard of each small partition, and then expanding by taking the neutral surface as a reference to obtain an expanding surface of the small partition; step S5, the unfolding surfaces of each small partition are spliced in sequence along the rolling direction by taking the initial pressing line as a reference, so that the unfolding surface of each large partition is obtained; and S6, connecting the two adjacent large partitions to obtain the unfolding structure of the integral wallboard.
Description
Technical Field
The invention relates to the technical field of aircraft wall panels, in particular to an integral wall panel unfolding method based on layering thickness.
Background
The fuselage wall panel of modern large-scale aircraft generally adopts a large-size integral wall panel to replace a traditional truss as a bearing structure, so that the weight of the fuselage is reduced, and the reliability of the integral structure is improved. Generally, the wall plate is formed by rolling, and the wall plate can be stretched due to deformation in the plate during the forming process. Different from the equal-thickness wallboard, the extensibility is consistent everywhere, and whole wallboard has rib and weight-reducing frame structure, and each structural part thickness is inconsistent, leads to the extensibility of each part inconsistent, and the complexity of shaping expansion greatly increases.
The simulation software expands the curved surface into a plane by using the principle of equal area, and for the equal-thickness wall plate, only one neutral surface is needed to be simply searched for expansion, so that the required expansion surface can be obtained. For the integral wallboard, the thickness of each structural part is not uniform, so that the unfolding neutral surfaces of each part are not positioned at the same thickness position, and therefore, the unfolding neutral surfaces are difficult to find. Aiming at the problem of difficult unfolding of the integral wallboard, the traditional solution is to estimate a thickness position as a uniform unfolding neutral plane according to experience, then carry out a forming test, compare test measurement results with designs, continuously adjust the position of the unfolding neutral plane according to experience, continuously carry out the test, and finally lead the test result to reach the allowable error range.
The conventional solution has three distinct disadvantages: firstly, the neutral plane is estimated usually according to experience, but for structures such as different integral wall plates, rib mouth frames and the like, the experience is often insufficient; secondly, a large number of tests are needed to correct the neutral plane, and particularly when the estimated initial neutral plane differs greatly from the ideal uniform neutral plane position, more tests are needed to obtain the ideal uniform neutral plane position; thirdly, even if a uniform neutral plane is obtained, there is a problem that the local forming precision is not required due to the inconsistent local structure expansion rate.
Disclosure of Invention
The invention aims to provide an integral wallboard unfolding method based on layering thickness, so as to obtain an integral wallboard unfolding surface, reduce forming errors and reduce production cost.
To achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a whole wallboard expansion method based on layering thickness, concretely comprising the following steps:
step S1, simplifying the structure on the wallboard to obtain a regular integral wallboard structure;
s2, partitioning the simplified integral wallboard structure according to the thickness of each structure and boundary lines of each structure on the simplified integral wallboard along the rolling direction during processing to obtain a plurality of large partitions;
dividing the wall plate in each small partition into equal-thickness plates according to the thickness of each structure in each large partition to obtain the small partition;
step S3, determining an initial pressing line;
s4, calculating the neutral plane of the wall plate of each small partition, and then expanding by taking the neutral plane as a reference to obtain an expanded surface of the small partition;
step S5, sequentially splicing the unfolding surfaces of each small partition along the rolling direction by taking the initial pressing line as a reference to obtain the unfolding surface of each large partition;
and S6, connecting two adjacent large partitions to obtain an unfolding structure of the integral wallboard.
Preferably, between the step S5 and the step S6, further includes: step S56, the final pressing position profile of each large partition is supplemented by the residual materials.
Preferably, the integral wallboard unfolding method based on the layering thickness further comprises the following steps:
step S7: re-modeling the unfolded structure of the integral wallboard obtained in the step S6, and re-establishing the structure simplified in the step S1 on the unfolded structure;
and reserving machining allowance with a preset size for the pressing-down starting end of the unfolding structure of the integral wallboard in the step S6.
Preferably, the step S1 includes simplifying the fillet, chamfer, rib and weld structure on the integral panel.
Preferably, the step S2 includes: the structural lines of the respective structures on the wall plate parallel to the rolling direction coincide with the boundary lines of the large partitions.
Preferably, the step S2 further includes: the boundary line of the small subarea coincides with the structural line of each structure on the wall plate.
Preferably, the step S3 includes:
step S31, assuming that the initial pressing is caused by plastic deformation to harden the material, so that the subsequent deformation is all expanded to an undeformed area;
in step S32, all the initial pressing lines of the large area are in a straight line.
Preferably, the step S3 further includes:
in step S33, it is assumed that the initial pressing line is at the equal thickness position of the expanded structure in step S6 and is on the side of the wall thickness of the integral wall panel.
Preferably, calculating the neutral plane of the wall plate of each small partition in step S4 includes: assuming that the mold will only act on one of the small sections at each forming instant, each forming of the wall panels within the small section is assumed to be a roll forming of a peer slab.
Preferably, the step S6 includes: at least one connection mode of a plane formed by a cubic spline curve or a plane formed by splicing curved surfaces or straight lines formed by two sections of circular arcs is adopted between two adjacent large partitions.
Preferably, when the two adjacent large subareas are connected by adopting a plane formed by linear splicing, the splicing angle beta is ensured to be less than beta 0 Splice distance along direction perpendicular to rolling
Wherein, beta: a splicing angle generated when straight line splicing is adopted between two adjacent large partition boundaries; beta 0 At a preset angle beta 0 Determined by the tolerance of the machining error.
Δl: and the boundary of the two adjacent large partitions are misplaced to generate misplacement distance after the large partitions are unfolded.
The invention has the beneficial effects that: according to the method, the detailed structure on the wallboard is simplified, the regular integral wallboard is obtained to reduce the unfolding workload, the integral wallboard is divided into large subareas according to the thickness and the boundary line of each structure on the wallboard, and then each large subarea is divided into small subareas according to the thickness of each structure in each large subarea. The divided small subareas are considered as equal-thickness plates, so that the neutral surface of each small subarea can be determined, the small subareas in the same large subarea are spliced in turn along the rolling direction by taking the initial pressing line as a reference to obtain the unfolding surface of each large subarea, and then the adjacent two large subareas are connected to obtain the unfolding structure of the integral wallboard. This approach avoids the need to determine a neutral plane of the overall panel when determining the deployment configuration, and does not rely purely on the experience of the staff to solve the deployment problem of the panel.
In addition, because the size of each small partition structure determined by the mode is accurate, the size of the whole unfolding structure is accurate, the error of the formed wallboard compared with the design is small, the test workload is reduced, the production efficiency is improved, and the test cost is reduced. And the local forming precision can not be achieved due to the fact that the local structure expansion rate is inconsistent.
Drawings
FIG. 1 is a schematic view of the structure of the integral wall panel of the present invention;
FIG. 2 is a simplified overall panel structure and a schematic diagram of large and small partitions according to the present invention;
FIG. 3 is a schematic view of the curved neutral plane of two successive small sections of the present invention;
FIG. 4 is a schematic illustration of three ways of misalignment contour stitching of the present invention;
FIG. 5 is a graph showing the effect of the staggered profile splicing of the integral wall panels of the present invention;
fig. 6 is a schematic view of the structure of the integrated wall panel with machining allowance after being spliced.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the 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 invention, as 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 made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
The implementation object in this embodiment is shown in fig. 1, and is an inboard structure of an integral panel, that is, a panel with a thickness variation of the panel of the aircraft is on the inboard side of the panel, and the thickness variation of the panel is similar to a step structure. The wallboard in this embodiment contains four thickness, and thickness distribution is as shown in fig. 1, and after the expansion total side length is 700mm, and each subtracts heavy frame mouth all has the fillet of diameter 20mm, and the thickness direction is provided with the radius and is 0.5mm fillet transition.
In the prior art, a curved surface is generally unfolded into a plane by using simulation software, and the simulation software is mostly based on the principle of equal area. It is difficult to determine a proper neutral plane for the monolithic wall panel having uneven thickness, and thus, the result obtained after the deployment tends to be inaccurate. The traditional solution is to estimate a thickness position as a uniform unfolding neutral plane according to experience, then to carry out a forming test, to compare test measurement results with designs, to continuously adjust the position of the unfolding neutral plane according to experience, to continuously carry out the test, and to finally reach the allowable error range. Problems with the conventional solutions: firstly, for different integral wall boards, rib opening frames and other structures, the problem of experience deficiency occurs; secondly, a large number of tests are needed to correct the neutral plane, so that the proper position of the neutral plane can be determined, 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 uniform neutral plane is obtained, there is a problem that the local forming precision is not required due to the inconsistent local structure expansion rate.
In order to more accurately obtain the expansion surface of the integral wallboard and reduce the forming error, the embodiment provides an integral wallboard expansion method based on layered thickness, which is applied to the specific implementation object, and the expansion amounts of the local structures are accurately estimated through the respective expansion of the local structures, so that the integral expansion amount is accurately controlled. The specific steps are shown in fig. 1 and 2, including:
step S1, simplifying the structure to obtain a regular integral wallboard structure; in step S1, simplifying the structure includes simplifying the structures on the wall panel and the structure of the overall outer contour of the wall panel to obtain a structured overall wall panel structure. In particular, since the local fine fillets, chamfers, ribs and welded structures (weld grooves, reinforcing ribs, reinforcing plates) have little influence on the deformation caused by the shaping of the integral wall plate, but greatly increase the complexity of the expansion, simplification is required. For the above implementation object, the wall plate in fig. 1 is provided with an a weight-reducing mouth frame, a B weight-reducing mouth frame and a C weight-reducing mouth frame, and the depths of the three can be different. And the rounded corners of 20mm of each weight-reducing mouth frame and the transitional rounded corners of 0.5mm at the edge of each weight-reducing mouth frame are removed in a simplified manner. As shown in FIG. 2, the shape and thickness of each weight-reducing mouth frame structure are changed into regular shapes, so that the calculation of the later-stage structure partition and the unfolding structure is facilitated.
And S2, the direction indicated by an arrow in FIG. 2 is a machining rolling direction, and the simplified integral wallboard structure is subjected to structural partitioning according to the thickness of each structure on the simplified integral wallboard and the boundary line of each structure along the rolling direction during machining, so that a plurality of large partitions are obtained. In each large partition, dividing the thickness of each part of structure in each large partition into small partitions, wherein the wall plates in each small partition are equal-thickness plates, and the thickness of the wall plates of two adjacent small partitions is not necessarily the same.
After the partitioning in step S2, the structural lines of the respective structures on the wall plate parallel to the rolling direction coincide with the boundary lines of the large partitions. The boundary lines of the small partitions coincide with the structural lines of the respective structures on the wall plate.
For the concrete implementation object, according to the thickness and the boundary line positions of the A weight-reducing mouth frame, the B weight-reducing mouth frame and the C weight-reducing mouth frame on the simplified integral wallboard along the rolling direction during processing, the left boundary line of the A weight-reducing mouth frame and the B weight-reducing mouth frame is overlapped, and the right boundary line of the B weight-reducing mouth frame and the C weight-reducing mouth frame is overlapped in the embodiment. As shown in fig. 2, the first large partition, the second large partition, the third large partition, the fourth large partition and the fifth large partition are divided into 5 large partitions, which are respectively indicated as 1,2, 3, 4 and 5 in fig. 2. The boundary line between the first large partition and the second large partition coincides with the left boundary line of the weight-reducing mouth frame A and the weight-reducing mouth frame B, the boundary line between the second large partition and the third large partition coincides with the right boundary of the weight-reducing mouth frame A, the boundary between the third large partition and the fourth large partition coincides with the left boundary of the weight-reducing mouth frame C, and the boundary between the fourth large partition and the fifth large partition coincides with the right boundary of the weight-reducing mouth frame B and the weight-reducing mouth frame C. The structures of the first and the fifth large partitions are consistent, and only one calculation is needed. Then dividing the structure into large subareas according to the thickness of each structure to obtain small subareas, wherein the boundary lines of the small subareas are overlapped with the boundary lines of the structures, and marking the boundary lines of the small subareas, such as the boundary lines of the small subareas in the second large subarea in fig. 2 are C0,2-C1,2-C2 and 2-C3 respectively; 2-C4,2-C5, wherein C0, C1, C2, C4, C5 are marked points of small partition boundaries in the large partition respectively.
In other embodiments, the structures of the first and fifth large partitions may not be identical, in which case one additional calculation is required. If the left boundary lines of the a weight reduction mouth frame and the B weight reduction mouth frame do not overlap, a large partition is required to be increased according to the boundary lines of the two. Similarly, if the right boundary lines of the B weight-reducing mouth frame and the C weight-reducing mouth frame do not overlap, a large area needs to be increased.
And S3, determining an initial pressing line. When the initial pressing line is determined, the initial pressing line is supposed to be hardened by plastic deformation of the pressing position, so that 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 extends towards the undeformed area, so that the initial pressing line of all large areas can be considered to be not distorted and to be on the same straight line. Meanwhile, in order to ensure a sufficient plastic deformation amount at the initial down-pressing line, it is assumed that the initial down-pressing line is at the equal thickness position of the expanded structure in step S6 and is on the side of the wall thickness of the integral wall panel.
And S4, calculating the neutral plane of the wall plate of each small partition, and then expanding by taking the neutral plane as a reference to obtain the expanded surface of the small partition.
And S5, sequentially splicing the unfolding surfaces of each small partition along the rolling direction by taking the initial pressing line as a reference to obtain the unfolding surface of each large partition.
Calculating the neutral plane of the wall of each small partition in step S4 comprises: assuming that the mold will only act on one cell at each forming instant, each forming of the wall panel within the cell is assumed to be a roll forming of a peer slab. When the forming bending curvature is determined, the neutral plane of the thickness structure can be calculated according to the theory of the bending neutral plane of the equal-thickness plate. And then unfolding the small partition by taking the neutral plane as a reference plane to obtain an unfolding plane of the small partition. The unfolding surfaces of the small partitions are spliced in sequence by taking the initial pressing line as a reference, and the initial unfolding surface of the large partition can be obtained.
Specifically, as shown in fig. 2, the wall plate of each small partition in the large partition is a constant thickness plate, and thus the wall plate bending in the small partition can be regarded as a constant thickness plate bending. As shown in fig. 3, the radius of the neutral plane can be calculated from the equal thickness plate bending theory by knowing the outer surface radius and the plate thickness as follows:
wherein ρi is the neutral plane radius of each small partition;
r i radius to the inner surface for each small zone;
r is uniform outer surface radius;
t i for the wall thickness of each small zone.
According to the unchanged length of the neutral plane before and after forming, the unfolding length of the small partition in the bending direction can be calculated:
the distance between the demarcation marking point and the pressing starting end is calculated as follows when the small partition rolling is finished:
the results are shown in the following table, in mm:
TABLE 1 Small partition Profile marker Point location
| Zone 1 | Zone 2 | Zone 3 | Zone 4 | Zone 5 | |
| 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 | -- |
In step S56, the final pressing position profile of each large partition is supplemented with the remainder. The contour line position of the final pressing position of each large subarea may not be on the same straight line, and the filling is performed in a residual material mode. The large area is parallel to the direction of the rolling die and can be considered to be not deformed, so that the length in the direction is only required to be designed.
And S6, connecting the two adjacent large partitions to obtain the unfolding structure of the integral wallboard. Local structures within small partitions of two or more large partitions may cause misalignment of the cross-region structure contours because other small partition structures of different large partitions are not uniform in thickness. In this embodiment, as shown in fig. 4 and 5, fig. 4 is a schematic diagram of a cross-sectional structure of a center facing layer between two adjacent large segments. The position indicated by H in fig. 5 is the splice.
Specifically, the weight-reducing mouth frame B and the adjacent area without the weight-reducing mouth frame structure are positioned in small subareas of a plurality of large subareas, and the contour lines of the cross-area structures are misplaced due to the inconsistent thicknesses of the structures of the small subareas of different large subareas. For the dislocation contour, there are three connection modes, one is, as A in FIG. 4 1 And splicing the contour lines of the structural expansion surface by adopting a cubic spline curve within a reasonable range of the dislocation ends of the two sections of contour lines so as to ensure the second-order continuity of the contour lines after forming. Second, as A in FIG. 4 2 The two sections of arcs are adopted for connection, so that the first-order continuity can be ensured. Third, as A in FIG. 4 3 As shown, the direct connection of straight lines can ensure zero-order continuity, and the influence on the integral formation is negligible when the angle of the folding line is smaller. The complexity of the three connection modes is gradually decreased.
When two adjacent large subareas are connected by adopting a plane formed by linear splicing, the splicing angle beta needs to be ensured to be in a reasonable range, so that a reasonable splicing length D needs to be selected:
β＜β 0
wherein, beta: a splicing angle generated when straight line splicing is adopted between two adjacent large partition boundaries; beta 0 At a preset angle beta 0 Determined by the allowable range of the machining error, generally, the larger the allowable range of the machining error is 0 The larger the corresponding dislocation splicing influence contour length D is, the shorter the dislocation splicing influence contour length D is;
Δl: and the boundary of the two adjacent large partitions are misplaced to generate misplacement distance after the large partitions are unfolded.
Taking β as 1 ° here, taking D as 10mm for all dislocation profiles, the above inequality requirement can be satisfied. The final splice effect is shown in fig. 5.
Step S7: the unfolded structure of the integral panel obtained in step S6 is re-modeled, and the structure simplified in step S1 is re-established on the unfolded structure. The position indicated by F as shown in fig. 6 is a reserved margin, and a predetermined size margin is reserved for the press-up end of the expanded structure of the integral panel in step S6.
Specifically, the expanded structure is reconstructed according to the partitioned contours of the expanded structure, the simplified structure is modeled again on the expanded structure using the simplified structure feature size, e.g., the simplified fillet is reconstructed on the corresponding expanded structure directly using the fillet diameter. The hold-down starting end of the unfolding part is required to be reserved with enough processing allowance, so that the initial hold-down end can have enough plastic deformation to prevent the lower pressing line from twisting, the hold-down ending end can have enough allowance for flush cutting of uneven extension of each large partition, and the rough material is guaranteed to have a regular shape. The length of the excess materials on both sides of the embodiment in the bending direction is 50mm.
In this embodiment, the above method is used to simplify the local detail structure on the wall plate, to obtain a regular integral wall plate to reduce the unfolding workload, then the integral wall plate is divided into large partitions according to the thickness and boundary line of each structure on the wall plate, and then each large partition is divided into small partitions according to the thickness of each structure in each large partition. The small subareas after the segmentation are equal-thickness plates, so that the neutral surface of each small subarea can be determined, the small subareas in the same large subarea are spliced in turn along the rolling direction by taking the initial pressing line as a reference to obtain the unfolding surface of each large subarea, and then the adjacent two large subareas are connected to obtain the unfolding structure of the integral wallboard. The method is applicable to the unfolding of the wall plate, which is inconsistent with the structure on the wall plate in the embodiment, so that the method can be implemented in the mode, and is wider in application. The method in the embodiment is programmed and then input into a computer, and the unfolding of different types of wallboards can be processed by utilizing the program.
In addition, because the size of each small partition structure determined in the mode is accurate, the size of the whole unfolding structure is accurate, the error compared with the design after the wallboard is formed is small, the test workload is reduced, the production efficiency is improved, and the test cost is reduced. And the local forming precision can not be achieved due to the fact that the local structure expansion rate is inconsistent.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (8)
1. The integral wallboard unfolding method based on the layering thickness is characterized by comprising the following specific steps of:
step S1, simplifying the structure on the wallboard to obtain a regular integral wallboard structure;
s2, partitioning the simplified integral wallboard structure according to the thickness of each structure and boundary lines of each structure on the simplified integral wallboard along the rolling direction during processing to obtain a plurality of large partitions;
dividing the wall plate in each small partition into equal-thickness plates according to the thickness of each structure in each large partition to obtain the small partition;
step S3, determining an initial pressing line;
s4, calculating the neutral plane of the wall plate of each small partition, and then expanding by taking the neutral plane as a reference to obtain an expanded surface of the small partition;
step S5, sequentially splicing the unfolding surfaces of each small partition along the rolling direction by taking the initial pressing line as a reference to obtain the unfolding surface of each large partition;
step S6, connecting two adjacent large partitions to obtain an unfolding structure of the integral wallboard;
the step S3 includes:
step S31, assuming that the initial pressing is caused by plastic deformation to harden the material, so that the subsequent deformation is all expanded to an undeformed area;
step S32, all initial pressing lines of the large subareas are straight lines;
step S33, assuming that the initial pressing line is positioned at the equal thickness position of the unfolding structure in step S6 and is positioned on one side of the whole wallboard with thick wall thickness;
calculating the neutral plane of the wall of each small partition in step S4 includes: assuming that the mold will only act on one of the small sections at each forming instant, each forming of the wall panels within the small section is assumed to be a roll forming of a peer slab.
2. The method for expanding a monolithic wallboard based on layered thickness according to claim 1, wherein the steps S5 and S6 further comprise: step S56, the final pressing position profile of each large partition is supplemented by the residual materials.
3. The method for developing a monolithic wallboard based on a layered thickness according to claim 1, wherein the method for developing a monolithic wallboard based on a layered thickness further comprises:
step S7: re-modeling the unfolded structure of the integral wallboard obtained in the step S6, and re-establishing the structure simplified in the step S1 on the unfolded structure;
and reserving machining allowance with a preset size for the pressing-down starting end of the unfolding structure of the integral wallboard in the step S6.
4. The method of claim 1, wherein step S1 includes simplifying the fillet, chamfer, rib and weld configuration of the integral panel.
5. The method for expanding a monolithic wall panel according to claim 1, wherein the step S2 comprises: the structural lines of the respective structures on the wall plate parallel to the rolling direction coincide with the boundary lines of the large partitions.
6. The method for expanding a monolithic wallboard based on layered thickness according to claim 5, wherein step S2 further comprises: the boundary line of the small subarea coincides with the structural line of each structure on the wall plate.
7. The method for expanding a monolithic wall panel according to claim 1, wherein the step S6 comprises: at least one connection mode of a plane formed by a cubic spline curve or a plane formed by splicing curved surfaces or straight lines formed by two sections of circular arcs is adopted between two adjacent large partitions.
8. The method for expanding a monolithic wallboard based on layered thickness according to claim 7, wherein when two adjacent large partition boundaries are connected by adopting a plane formed by linear splicing, the splicing angle beta < beta is ensured 0 Splice distance along direction perpendicular to rolling
Wherein, beta: a splicing angle generated when straight line splicing is adopted between two adjacent large partition boundaries; beta 0 At a preset angle beta 0 Determined by the allowable range of machining errors;
Δl: and the boundary of the two adjacent large partitions are misplaced to generate misplacement distance after the large partitions are unfolded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911192002.4A CN112861244B (en) | 2019-11-28 | 2019-11-28 | Integral wallboard unfolding method based on layering thickness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911192002.4A CN112861244B (en) | 2019-11-28 | 2019-11-28 | Integral wallboard unfolding method based on layering thickness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112861244A CN112861244A (en) | 2021-05-28 |
| CN112861244B true CN112861244B (en) | 2024-04-05 |
Family
ID=75995619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911192002.4A Active CN112861244B (en) | 2019-11-28 | 2019-11-28 | Integral wallboard unfolding method based on layering thickness |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112861244B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102591255A (en) * | 2012-03-22 | 2012-07-18 | 沈阳飞机工业（集团）有限公司 | Unfolding method for high-bar integral wall board |
| CN102842147A (en) * | 2012-07-10 | 2012-12-26 | 西北工业大学 | Three-dimensional integral wall panel expanding and modeling method |
| CN106709184A (en) * | 2016-12-26 | 2017-05-24 | 中国航空工业集团公司西安飞机设计研究所 | Generation method of inner model curve face of wing wall panel |
| CN110472291A (en) * | 2019-07-18 | 2019-11-19 | 武汉理工大学 | A kind of method of deploying of Double curve degree plate |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19946011A1 (en) * | 1999-08-05 | 2001-02-08 | Alusuisse Tech & Man Ag | Process for reshaping an initial profile or the like workpiece by means of internal high pressure, and profile therefor |
-
2019
- 2019-11-28 CN CN201911192002.4A patent/CN112861244B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102591255A (en) * | 2012-03-22 | 2012-07-18 | 沈阳飞机工业（集团）有限公司 | Unfolding method for high-bar integral wall board |
| CN102842147A (en) * | 2012-07-10 | 2012-12-26 | 西北工业大学 | Three-dimensional integral wall panel expanding and modeling method |
| CN106709184A (en) * | 2016-12-26 | 2017-05-24 | 中国航空工业集团公司西安飞机设计研究所 | Generation method of inner model curve face of wing wall panel |
| CN110472291A (en) * | 2019-07-18 | 2019-11-19 | 武汉理工大学 | A kind of method of deploying of Double curve degree plate |
Non-Patent Citations (1)
| Title |
|---|
| 大型整体壁板展开技术研究;阳波;苟文博;赖丽珍;陈金平;张耀祥;;机械制造(01);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112861244A (en) | 2021-05-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3069964B1 (en) | Underbody manufacturing method and vehicle underbody | |
| CN108723630B (en) | Manufacturing method of spiral twisted box | |
| CN105499388B (en) | Divide the method for the swollen pattern tool of valve and the internal annular element with muscle of manufacture | |
| EP2020541B1 (en) | Method for manufacturing a sealing ring | |
| CN109955043B (en) | Forming method of space curved surface protective plate with inner and outer bidirectional reinforcing ribs | |
| EP3453526B1 (en) | System and method for edge length differential measurement for fiber steering in automated fiber placement | |
| CN102842147A (en) | Three-dimensional integral wall panel expanding and modeling method | |
| JP2023115321A (en) | Methods of synchronizing manufacturing of shimless assembly | |
| EP3868979B1 (en) | Method for tensioning prefabricated component employing centroid tracking and seam width control | |
| CN112861244B (en) | Integral wallboard unfolding method based on layering thickness | |
| CN107957979B (en) | Method for determining welding shrinkage of H-shaped longitudinal beam | |
| CN113486414B (en) | Method for obtaining accurate manufacturing process diagram of overflowing surface horizontal steel bifurcated pipe through three-dimensional modeling | |
| CN112339930B (en) | Three-dimensional modeling and precision control method for ship stem steel casting | |
| KR20120016061A (en) | Method for the production of extra heavy pipe joints, preferably for off-shore wind energy plants | |
| CN109592005B (en) | Design method of composite material stringer with notch | |
| CN109016534B (en) | Method for connecting at least two components with self-adjusting application of a medium | |
| CN105073287A (en) | Method of manufacturing a beam | |
| CN103143747A (en) | Processing method for double-layered separating wall kind-part hole and assembly clamp of double-layered separating wall kind-part | |
| CN109079141B (en) | Outer sheath and method for eliminating structural size deviation of rib in powder metallurgy component | |
| Biba et al. | Automated extrusion die design integrated with simulation of material flow | |
| CN103412516B (en) | A kind of wide row end mill processing cutter orbit making unified approach | |
| CN111648520A (en) | Prefabricated part and method for producing hollow concrete prefabricated unit by using same | |
| CN115255814B (en) | Manufacturing method of steel shell space inextensible curved surface decorative plate unit | |
| JP2007237276A (en) | Method of manufacturing sheet-pile product having larsen type joint | |
| CN219052501U (en) | T-shaped and L-shaped profile correction die |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |