CN113295371B - Method for manufacturing thick plate corner section elliptical ring for large-scale low-temperature wind tunnel - Google Patents
Method for manufacturing thick plate corner section elliptical ring for large-scale low-temperature wind tunnel Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 42
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 55
- 239000010959 steel Substances 0.000 claims abstract description 55
- 238000003466 welding Methods 0.000 claims abstract description 53
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 16
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- 239000011229 interlayer Substances 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 229910000963 austenitic stainless steel Inorganic materials 0.000 abstract description 7
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Abstract
The application provides a method for manufacturing thick plate corner section elliptical rings for a large-scale low-temperature wind tunnel, which comprises the following steps: (1) The three points draw circles to divide the elliptical ring shell into five curvatures of 16 sections of circular arcs; (2) continuously rolling the elliptical ring shell into eight sections with variable curvature; (3) Assembling the arc plate shell on the steel platform with the well adjusted elevation; (4) The arc plate shell carries out curvature local correction by utilizing the inner and outer limiting plates and the wedge-shaped steel block; (5) spot welding the arc plate shell with a welding deformation prevention support; (6) assembling and spot welding the external reinforcing ribs and the elliptical ring shell; (7) welding the elliptical ring shell; and (8) welding an external reinforcing rib with the elliptical ring shell. The method can be used for manufacturing the large-scale corner section elliptical ring for the low-temperature wind tunnel with the plate thickness of 50mm or more, has the characteristics of simplicity, high manufacturing efficiency, high forming precision, easiness in operation and the like, and solves the problem of difficulty in controlling the manufacturing precision of the large-scale low-temperature wind tunnel corner section austenitic stainless steel elliptical ring.
Description
Technical Field
The application relates to the field of wind tunnels, in particular to a method for manufacturing thick plate corner section elliptical rings for a large-scale low-temperature wind tunnel.
Background
Since the advent of wind tunnels, significant progress has been made in aerodynamic research and aircraft development using wind tunnel technology, and its effects have become more and more significant. However, with the increasing size of the test object (such as an aircraft), the conventional wind tunnel test faces some serious challenges, wherein the most important is that the conventional wind tunnel cannot be tested in the full-size reynolds number, the high-reynolds number wind tunnel test is the premise and guarantee for realizing the fine aerodynamic design and accurate flight performance prediction of the aircraft, and the large-size low-temperature wind tunnel is born and developed for solving the problem. The large low-temperature wind tunnel needs to be provided with a corner section which can realize 90-degree turning of airflow and consists of two 45-degree beveling straight cylinders and an elliptical ring. The high-precision flow deflector for changing the air flow direction is arranged in the elliptical ring, and how to ensure the forming precision in the manufacturing process of the elliptical ring is a key factor for ensuring the manufacturing quality of the corner section.
The large low-temperature wind tunnel elliptical ring shell is large in size, the short axis of the elliptical shell is more than 7m, the corresponding long axis is more than 9.9m, the large low-temperature wind tunnel elliptical ring shell is made of austenitic stainless steel, and the existing manufacturing process comprises the following two steps:
(1) Press forming
The elliptical ring shell is divided into two sections along the long axis direction, the two symmetrical sections are processed with different curvatures of the shell by a press forming method, and each section is processed and formed in a hydraulic press in a jacking mode. In the jacking process, a worker needs to adjust the jacking depth of the die by experience, the processing process is complicated, the efficiency is low, and the trend of large-scale development of the low-temperature wind tunnel is difficult to meet.
(2) Four-center circle method sectional rolling system
The elliptical ring shell is divided into four sections (the upper section and the lower section and the left section and the right section are two same symmetrical sections) according to a four-center circle method, the sections are divided into two curvatures of R1 and R2 for rolling, and then the sections are assembled and welded. The process has two disadvantages: firstly, the curvature of the long axis and the short axis of the shell is the same as that of a standard ellipse, the shell curvature deviated from the long axis and the short axis has deviation, the deviation angle is larger, the curvature deviation is larger, and the deviation is more obvious due to the fact that the curvature of the two segments at the short axis is larger. Due to wide deviation range and large deviation degree, the efficiency of flame or rigidity correction is low, and the forming precision is difficult to ensure. Meanwhile, austenitic stainless steel cannot be corrected by flame, and thick plate stainless steel is difficult to correct by rigidity. And secondly, the elliptical ring of the large low-temperature wind tunnel has a longer perimeter, and when the elliptical ring is divided into four segmented rolling processes, because the length of a single segmented steel plate is longer, when the elliptical ring is near the end of the rolling process, the steel plate can cause curvature deviation due to dead weight, and the lifting height of the end is higher, so that potential safety hazards exist.
Disclosure of Invention
One of the purposes of the application is to provide a method for manufacturing a thick plate corner section elliptical ring for a large-scale low-temperature wind tunnel, and the method aims to solve the problem that the existing low-temperature wind tunnel corner section elliptical ring shell is difficult to manufacture.
The technical scheme of the application is as follows:
a method for manufacturing thick plate corner section elliptical rings for large-scale low-temperature wind tunnels comprises the following steps:
step one, dividing an elliptical ring shell into five curvatures: according to the characteristic that the length ratio of the major axis to the minor axis of the elliptical ring shell of the wind tunnel corner section is designed, the elliptical ring shell is divided into sixteen circular arcs with five curvatures by utilizing the principle of 'drawing a circle by three points', namely circular arcs ab, bc, cd, de, ef, d3f, c3d3, b1c3, a1b1, a1c2, c2d2, d2f1, e1f1, d1e1, c1d1 and ac1 which are connected in sequence, the center of the elliptical ring shell is o, the end a and the end a1 are symmetrical about the minor axis of the ellipse of the elliptical ring shell, the end a and the end b are symmetrical about the major axis of the ellipse, the end b and the end b1 are symmetrical about the minor axis of the ellipse, endpoint c is symmetric with endpoint c1 about the major axis of the ellipse, endpoint c1 is symmetric with endpoint c2 about the minor axis of the ellipse, endpoint c2 is symmetric with endpoint c3 about the major axis of the ellipse, endpoint c is symmetric with endpoint c3 about the minor axis of the ellipse, endpoint d is symmetric with endpoint d1 about the major axis of the ellipse, endpoint d1 is symmetric with endpoint d2 about the minor axis of the ellipse, endpoint d2 is symmetric with endpoint d3 about the major axis of the ellipse, endpoint d is symmetric with endpoint d3 about the minor axis of the ellipse, endpoint e is symmetric with endpoint e1 about the major axis of the ellipse, endpoint e1 is symmetric with endpoint f1 about the minor axis of the ellipse, endpoint f1 is symmetric with endpoint f about the major axis of the ellipse, endpoint f is symmetric with endpoint e about the minor axis of the ellipse; the curvature radii of the arc ab and the arc a1b1 are both R1, and the arc length angles are both 9.6 degrees; the curvature radii of the arc bc, the arc ac1, the arc a1c2 and the arc b1c3 are all R2, and the arc length angles are all 18.9 degrees; the curvature radii of the arc cd, the arc c1d1, the arc c2d2 and the arc c3d3 are all R3, and the arc length angles are all 7.8 degrees; the curvature radii of the arc de, the arc d1e1, the arc d2f1 and the arc d3f are all R4, and the arc length angles are all 20.2 degrees; the curvature radii of the arc ef and the arc e1f1 are both R5, and the arc length angle is both 76.6 degrees;
step two, dividing the elliptical ring shell into eight sections of variable curvatures for rolling: the elliptical ring shell is divided into eight circular arc plate shells of a first circular arc plate, a second circular arc plate, a third circular arc plate, a fourth circular arc plate, a fifth circular arc plate, a sixth circular arc plate, a seventh circular arc plate and an eighth circular arc plate in sequence by four connecting lines of coc2, eof1, foe1 and c3oc 1; the first circular arc plate and the fifth circular arc plate are in the same section and are rolled by a curvature radius R5; the third circular arc plate and the seventh circular arc plate are in the same section and are respectively rolled by the continuous variable curvature of curvature radiuses R2, R1 and R2 in sequence and in sequence; the second circular arc plate, the fourth circular arc plate, the sixth circular arc plate and the eighth circular arc plate are all the same segment and are respectively rolled by continuous variable curvature of curvature radiuses R3 and R4 in sequence;
step three, assembling the arc plate shell: firstly, marking out the contour line of a standard ellipse on a steel platform, arranging 26-36 small steel blocks at the same interval along the contour line of the standard ellipse, and adjusting the elevations of all the small steel blocks to be consistent by using a level gauge; before assembly, a plurality of spaced baffles are uniformly arranged on the inner side of the contour line of the standard ellipse, and the ends of the baffles are tightly attached to the contour line of the standard ellipse; after all the small steel blocks and the baffle plates are adjusted, the small steel blocks and the baffle plates are spot-welded on the steel platform; when the first arc plate, the fifth arc plate, the third arc plate and the seventh arc plate are assembled, and then the second arc plate, the fourth arc plate, the sixth arc plate and the eighth arc plate are assembled;
step four, locally correcting the curvature of the arc plate shell: after the eight arc plate shells are assembled, finding out the deviation between the contour line of the arc plate shell and the contour line of the standard ellipse, and correcting;
step five, installing a supporting structure on the arc plate shell: after the local correction of the arc plate shell is completed, spot welding is carried out on eight longitudinal welding seams of the arc plate shell, and then three support structures are installed at the center line of the short shaft of the arc plate shell from bottom to top at intervals;
step six, assembling and spot-welding external reinforcing ribs and the elliptical ring shell: respectively assembling a T-shaped reinforcing ring and a rib plate on the elliptical ring shell, performing tack welding on a web plate and the elliptical ring shell, and then performing tack welding on the rib plate, the elliptical ring shell and the web plate;
step seven, welding the elliptical ring shell: a plurality of longitudinal welding lines of the elliptical ring shell are respectively welded, the cover surface layer welding lines filled during welding are all welded in separate channels, and the inter-channel temperature and the interlayer temperature are less than or equal to 30 degrees;
step eight, welding the external reinforcing ribs and the elliptical ring shell: and welding the T-shaped reinforcing ring and the elliptical ring shell, and welding the rib plate and the elliptical ring shell.
As a technical scheme of the application, in the step one, the local maximum curvature deviation of the sixteen sections of circular arcs and the standard ellipse is less than 3mm.
As a technical solution of the present application, in step two, each circular arc plate shell is rolled by using a straight steel plate, and the length of the straight steel plate is greater than the length of the sectional arc length corresponding to each circular arc plate shell on the standard ellipse.
As a technical solution of the present application, in step two, after the first arc plate, the fifth arc plate, the third arc plate and the seventh arc plate are rolled by a four-roll plate rolling machine, the excess lengths at the two ends of each arc plate shell are removed according to the segmented arc lengths corresponding to the arc plate shells on the standard ellipse by using the center line of each arc plate shell as a reference; and the second circular arc plate, the fourth circular arc plate, the sixth circular arc plate and the eighth circular arc plate take the respective corresponding variable curvature positions as references, and redundant lengths at two ends of each circular arc plate shell are removed according to the segmented arc lengths corresponding to the circular arc plate shells on the standard ellipse.
As a technical scheme of this application, in step four, adopt interior limiting plate, outer limiting plate and wedge steel billet right the camber of circular arc board casing is rectified: if the contour line of the circular arc plate shell is positioned on the outer side of the contour line of the standard ellipse, the outer limiting plate is spot-welded on the steel platform on the outer side of the circular arc plate shell, and the wedge-shaped steel block is driven into a space between the outer limiting plate and the circular arc plate shell through a sledge hammer until the contour line of the circular arc plate shell is coincided with the contour line of the standard ellipse; if the contour line of the arc plate shell is in the inner side of the contour line of the standard ellipse, the inner side of the arc plate shell is in the steel platform, the inner limiting plate is in spot welding, the wedge-shaped steel block is driven into the inner limiting plate and the arc plate shell through the sledge hammer until the contour line of the arc plate shell is coincided with the contour line of the standard ellipse.
As a technical scheme of this application, in step five, every bearing structure comprises arc riding plate and pipe, will the pipe set up in on the central line of the minor axis of circular arc board casing, and respectively one in the both ends of pipe each welding arc riding plate, and will arc riding plate spot welding is in corresponding on the inner wall of circular arc board casing.
As a technical solution of the present application, in step five, the uppermost the support structure distance 90-110 mm from the end of the arc plate housing, the lowermost the support structure distance 90-110 mm from the end of the arc plate housing, the support structure in the middle is the same distance to the other two support structures respectively.
The beneficial effect of this application:
the method for manufacturing the thick plate corner section elliptical ring for the large-scale low-temperature wind tunnel can be used for manufacturing the large plate corner section elliptical ring for the low-temperature wind tunnel with the thickness of 50mm or more, has the characteristics of simple method, high manufacturing efficiency, high molding precision, easiness in operation and the like, solves the problem of manufacturing precision control of the large-scale low-temperature wind tunnel corner section austenitic stainless steel elliptical ring, and has the following advantages compared with the existing molding method:
the method divides the large-scale low-temperature wind tunnel corner section elliptical ring shell into sixteen sections of circular arcs with 5 curvatures, so that the curvature change of the elliptical ring shell is very continuous, the precision is greatly improved compared with that of a four-center circular method, the local maximum curvature deviation is less than 3mm, and the shell assembling difficulty is greatly reduced;
the method divides the large-scale low-temperature wind tunnel corner section elliptical ring shell into eight sections for rolling, and is very suitable for manufacturing large-scale corner section elliptical rings; compared with other segmentation processes, the forming precision is improved, and the operation is easier and safer; meanwhile, the eight sections are manufactured by adopting a continuous variable curvature roller, so that the curvature deviation range is greatly reduced, and the problem that the thick plate austenitic stainless steel cannot be corrected by adopting flame or is low in efficiency by adopting rigidity correction is solved;
thirdly, the method adopts reasonable assembly sequence and size correction process of the elliptical ring shell, and ensures that the perimeter of the elliptical ring shell is consistent with that of a standard ellipse; the local curvature deviation of the shell is adjusted through simple operation, so that the forming precision is further ensured, and the assembling efficiency is also improved;
in the method, the welding sequence of the elliptical ring shell and the external reinforcing ribs thereof is more reasonable, and meanwhile, a correct welding process is formulated through reasonable arrangement and support, so that the welding deformation and the size shrinkage of the elliptical ring shell are greatly reduced, and the problems of size deviation and precision reduction of the elliptical ring at the corner section after welding are solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some examples of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also derive other related drawings based on these drawings without inventive effort.
FIG. 1 is a curvature diagram of an elliptical ring housing divided by the principle of "drawing a circle at three points" provided by an embodiment of the present application;
fig. 2 is a schematic view of eight circular arc plates of an elliptical ring housing provided in an embodiment of the present application;
FIG. 3 is a schematic diagram of the arrangement of the small steel blocks and the baffle plates on the steel platform provided by the embodiment of the application;
FIG. 4 is a schematic diagram of an elliptical ring housing assembly provided in an embodiment of the present application;
fig. 5 is a schematic calibration diagram of the inner limiting plate, the outer limiting plate and the wedge-shaped steel block in the first case according to the embodiment of the present application;
fig. 6 is a schematic calibration diagram of the inner limiting plate, the outer limiting plate and the wedge-shaped steel block in the second case according to the embodiment of the present application;
FIG. 7 is a schematic view of a support structure of an elliptical ring housing provided in an embodiment of the present application;
fig. 8 is an assembly diagram of an external stiffener of an elliptical ring housing according to an embodiment of the present disclosure.
Icon: 1-a first arc plate; 2-a second arc plate; 3-a third arc plate; 4-a fourth arc plate; 5-a fifth arc plate; 6-sixth circular arc plate; 7-a seventh circular arc plate; 8-eighth circular arc plate; 9-a steel platform; 10-small steel blocks; 11-a baffle plate; 12-contour of standard ellipse; 13-longitudinal welds; 14-inner limiting plate; 15-wedge shaped steel blocks; 16-arc horse board; 17-round tube; 18-a web; 19-rib plates; 20-outer limit plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.
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 application, it should be noted that the terms "upper", "lower", and the like refer to orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.
Further, in the present application, unless expressly stated or limited otherwise, the first feature may be located on or below the second feature and may comprise direct contact between the first and second features, or may comprise direct contact between the first and second features through another feature not in direct contact. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.
Example (b):
referring to fig. 1 and fig. 2 to 8, the present application provides a method for manufacturing a thick plate corner section elliptical ring for a large low-temperature wind tunnel, which can be used for manufacturing a large corner section elliptical ring for a low-temperature wind tunnel with a thickness of 50mm or more, and mainly comprises the following steps:
step one, dividing the elliptical ring shell into five curvatures according to the principle of drawing a circle by three points: according to the characteristic that the length ratio of the long axis to the short axis of the elliptical ring shell of the wind tunnel corner section is designed, the elliptical ring shell is divided into sixteen sections of circular arcs with five curvatures by utilizing the principle of 'drawing a circle by three points', namely, the circular arcs ab, bc, cd, de, ef, d3f, c3d3, b1c3, a1b1, a1c2, c2d2, d2f1, e1f1, d1e1, c1d1 and ac1 which are connected in sequence are sixteen sections of circular arcs, and the circle center of the elliptical ring shell is o; meanwhile, the end point a and the end point a1 are symmetrical with respect to the short axis of the ellipse of the elliptical ring housing, the end point a and the end point b are symmetrical with respect to the long axis of the ellipse, the end point b and the end point b1 are symmetrical with respect to the short axis of the ellipse, the end point c1 and the end point c2 are symmetrical with respect to the short axis of the ellipse, the end point c2 and the end point c3 are symmetrical with respect to the long axis of the ellipse, the end point d and the end point d1 are symmetrical with respect to the long axis of the ellipse, the end point d1 and the end point d2 are symmetrical with respect to the short axis of the ellipse, the end point d2 and the end point d3 are symmetrical with respect to the long axis of the ellipse, the end point e and the end point e 3 are symmetrical with respect to the short axis of the ellipse, the end point e and the end point e1 are symmetrical with respect to the long axis of the ellipse, the end point f1 and the end point f1 are symmetrical with respect to the long axis of the ellipse, and the end point f and the end point e are symmetrical with respect to the short axis of the ellipse; wherein the curvature radii of the arc ab and the arc a1b1 are both R1, and the arc length angles are both 9.6 degrees; the curvature radiuses of the circular arcs bc, ac1, a1c2 and b1c3 are all R2, and the arc length angles are all 18.9 degrees; the curvature radii of the arc cd, the arc c1d1, the arc c2d2 and the arc c3d3 are all R3, and the arc length angles are all 7.8 degrees; the curvature radiuses of the arc de, the arc d1e1, the arc d2f1 and the arc d3f are all R4, and the arc length angles are all 20.2 degrees; the curvature radiuses of the arc ef and the arc e1f1 are both R5, and the arc length angle is both 76.6 degrees;
step two, dividing the elliptical ring shell into eight sections of variable curvatures for rolling: the elliptical ring shell is divided into eight circular arc plate shells including a first circular arc plate 1, a second circular arc plate 2, a third circular arc plate 3, a fourth circular arc plate 4, a fifth circular arc plate 5, a sixth circular arc plate 6, a seventh circular arc plate 7 and an eighth circular arc plate 8 in sequence by four connecting lines of coc2, eof1, foe1 and c3oc 1; the first circular arc plate 1 and the fifth circular arc plate 5 are in the same segment, and are rolled by a curvature radius R5; the third circular arc plate 3 and the seventh circular arc plate 7 are in the same segment, and are respectively rolled by continuously and circularly changing the curvature radius R2, R1 and R2 in turn; the second circular arc plate 2, the fourth circular arc plate 4, the sixth circular arc plate 6 and the eighth circular arc plate 8 are all the same segments and are respectively rolled by sequentially circulating the continuous variable curvature with the curvature radius R3 and the curvature radius R4;
step three, assembling the arc plate shell: firstly, marking out the contour line 12 of a standard ellipse on a steel platform 9, then arranging 26-36 small steel blocks 10 at the same interval along the contour line 12 of the standard ellipse, and adjusting the elevations of all the small steel blocks 10 to be consistent by using a level gauge; before assembly, a plurality of spaced baffles 11 are uniformly arranged on the inner side of the contour line 12 of the standard ellipse, and the end heads of the baffles 11 are tightly attached to the contour line 12 of the standard ellipse; all the small steel blocks 10 and the baffle plates 11 are spot-welded on the steel platform 9 after being adjusted; when assembling, the first arc plate 1, the fifth arc plate 5, the third arc plate 3 and the seventh arc plate 7 are assembled firstly, and then the second arc plate 2, the fourth arc plate 4, the sixth arc plate 6 and the eighth arc plate 8 are assembled;
step four, locally correcting the curvature of the arc plate shell: after the eight arc plate shells are assembled, finding out the deviation between the contour line of the arc plate shell and the contour line 12 of the standard ellipse, and correcting;
step five, installing a supporting structure on the arc plate shell: after the local correction of the arc plate shell is completed, spot welding is carried out on eight longitudinal welding lines 13 of the arc plate shell, and then three supporting structures are arranged at the center line of the short shaft of the arc plate shell from bottom to top at intervals;
step six, assembling and spot-welding the external reinforcing ribs and the elliptical ring shell: respectively assembling the T-shaped reinforcing ring and the rib plate 19 on the elliptical ring shell, performing tack welding on the web plate 18 and the elliptical ring shell, and then performing tack welding on the rib plate 19, the elliptical ring shell and the web plate 18;
step seven, welding the elliptical ring shell: a plurality of longitudinal welding seams 13 of the elliptical ring shell are respectively welded, the cover surface layer welding seams filled in the welding process are respectively welded in separate channels, and the inter-channel temperature and the interlayer temperature are less than or equal to 30 degrees;
step eight, welding an external reinforcing rib and the elliptical ring shell: and welding the T-shaped reinforcing ring and the elliptical ring shell, and welding the rib plate 19 and the elliptical ring shell.
Further, in this embodiment, the minor axis inner diameter of the elliptical ring housing is 7400mm, the major axis inner diameter is 10465mm, the material is 304L, and the thickness is 60mm; meanwhile, R1=2628.3mm, R2=3084.7mm, R3=4111.1mm, R4=5301.7mm, R5=7131.6mm.
It should be noted that, in this embodiment, in step one, the local maximum curvature deviation of the sixteen circular arcs from the standard ellipse is less than 3mm.
In the second step, each circular arc plate shell is rolled by adopting a straight steel plate, and the length of each straight steel plate is larger than the corresponding segmented arc length (namely the arc length of the central layer) on the standard ellipse by 120mm. That is, in this embodiment, divide into several circular arc board casings with the elliptical ring casing and assemble, the circular arc board casing adopts straight steel sheet to roll up and makes, and straight steel sheet length should be as long as the segmentation arc length that the circular arc board casing corresponds, but in order to improve the roll system quality (generally straight board is rolled up, and the quality at its both ends is relatively poor), consequently, the length of straight steel sheet will generally be greater than the segmentation arc length of the circular arc board casing corresponding to it when rolling up, roll up and just cut circular arc board casing after accomplishing and be its theoretical length (segmentation arc length promptly). Meanwhile, the thicker the circular arc plate shell is, the longer the straight steel plate is, and according to experience, the length of the straight steel plate larger than twice the thickness is the best. For example, the length of the segmented arc is 100mm, and the thickness of the plate is 20mm, then the length of the corresponding straight steel plate is 100mm +2 × 20mm =140mm.
In the second step, after the first arc plate 1, the fifth arc plate 5, the third arc plate 3 and the seventh arc plate 7 are rolled by adopting a four-roller plate rolling machine, removing redundant lengths at two ends of each arc plate shell according to the sectional arc length corresponding to each arc plate shell on the standard ellipse by taking the central line of each arc plate shell as a reference; the second circular arc plate 2, the fourth circular arc plate 4, the sixth circular arc plate 6 and the eighth circular arc plate 8 take the corresponding variable curvature positions as references, and the redundant lengths at two ends of each circular arc plate shell are removed according to the corresponding segmental arc lengths of each circular arc plate shell on the standard ellipse. And before the second circular arc plate 2, the fourth circular arc plate 4, the sixth circular arc plate 6 and the eighth circular arc plate 8 are assembled, the lengths of the gap, the length of the contour line 12 of the residual standard ellipse, the forming precision and the like are refined according to the groove group.
In the third step, the standard ellipse is the theoretical ellipse on the product design drawing, which is the size of the actual product.
In step four, adopt interior limiting plate 14, outer limiting plate 20 and wedge steel block 15 to rectify the camber of circular arc board casing: if the contour line of the circular arc plate shell is outside the contour line 12 of the standard ellipse, spot-welding an outer limit plate 20 on the steel platform 9 outside the circular arc plate shell, and driving a wedge-shaped steel block 15 between the outer limit plate 20 and the circular arc plate shell by a sledge hammer until the contour line of the circular arc plate shell is coincided with the contour line 12 of the standard ellipse (as shown in fig. 6); if the contour line of the circular arc plate shell is positioned at the inner side of the contour line 12 of the standard ellipse, the inner limit plate 14 is spot-welded on the steel platform 9 at the inner side of the circular arc plate shell, and the wedge-shaped steel block 15 is driven into the space between the inner limit plate 14 and the circular arc plate shell by a sledge hammer until the contour line of the circular arc plate shell is coincided with the contour line 12 of the standard ellipse (as shown in fig. 5).
In the fifth step, each support structure is composed of an arc-shaped horse plate 16 and a circular tube 17, the circular tube 17 is arranged on the central line of the short shaft of the arc-shaped plate shell, the arc-shaped horse plates are respectively welded at two ends of the circular tube 17, and the arc-shaped horse plates 16 are spot-welded on the inner wall of the corresponding arc-shaped plate shell.
In the fifth step, the uppermost supporting structure is 90-110 mm away from the end of the arc plate shell, the lowermost supporting structure is 90-110 mm away from the end of the arc plate shell, and the distances from the middle supporting structure to the other two supporting structures are the same.
The method for manufacturing the thick plate corner section elliptical ring for the large-scale low-temperature wind tunnel can be used for manufacturing the large-scale corner section elliptical ring for the low-temperature wind tunnel with the thickness of 50mm or more, has the characteristics of simple method, high manufacturing efficiency, high molding precision, easiness in operation and the like, solves the problem of manufacturing precision control of the large-scale low-temperature wind tunnel corner section austenitic stainless steel elliptical ring, and has the following advantages compared with the conventional molding method:
the method divides the large-scale low-temperature wind tunnel corner section elliptical ring shell into sixteen sections of circular arcs with 5 curvatures, so that the curvature change of the elliptical ring shell is very continuous, the precision is greatly improved compared with that of a four-center circular method, the local maximum curvature deviation is less than 3mm, and the shell assembling difficulty is greatly reduced;
the method divides the large-scale low-temperature wind tunnel corner section elliptical ring shell into eight sections for rolling, and is very suitable for manufacturing the large-scale corner section elliptical ring; compared with other segmentation processes, the forming precision is improved, and the operation is easier and safer; meanwhile, the eight sections are manufactured by adopting a continuous variable curvature roller, so that the curvature deviation range is greatly reduced, and the problem that the thick plate austenitic stainless steel cannot be corrected by adopting flame or is low in efficiency by adopting rigidity correction is solved;
thirdly, the method adopts a reasonable elliptical ring shell assembly sequence and a size correction process, so that the circumference of the elliptical ring shell is consistent with the circumference of a standard ellipse; the local curvature deviation of the shell is adjusted through simple operation, so that the forming precision is further ensured, and the assembling efficiency is also improved;
in the method, the welding sequence of the elliptical ring shell and the external reinforcing ribs thereof is more reasonable, and meanwhile, a correct welding process is formulated through reasonable arrangement and support, so that the welding deformation and the size shrinkage of the elliptical ring shell are greatly reduced, and the problems of size deviation and precision reduction of the elliptical ring at the corner section after welding are solved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (6)
1. A manufacturing method of a thick plate corner section elliptical ring for a large-scale low-temperature wind tunnel is characterized by comprising the following steps:
step one, dividing an elliptical ring shell into five curvatures: the length ratio of the long axis to the short axis of the elliptical ring shell of the wind tunnel corner section is designed as
The elliptical ring shell is divided into sixteen sections of circular arcs with five curvatures by using the principle of drawing a circle by three points, namely circular arcs ab, bc, cd, de, ef, d3f, c3d3, b1c3, a1b1, a1c2, c2d2, d2f1, e1f1, d1e1, c1d1 and ac1 which are connected in sequence, the center of the elliptical ring shell is o, the points a and a1 are symmetric about the short axis of the ellipse, the points a and b are symmetric about the long axis of the ellipse, the points b and b1 are symmetric about the short axis of the ellipse, the points c and c1 are symmetric about the long axis of the ellipse, the points c1 and c2 are symmetric about the short axis of the ellipse, the points c2 and c3 are symmetric about the long axis of the ellipse, the points c and c3 are symmetric about the short axis of the ellipse, the points d and d1 are symmetric about the long axis of the ellipse, and d2 are symmetric about the long axis of the ellipse, and d1The minor axis of the ellipse is symmetrical, the end points d2 and d3 are symmetrical about the major axis of the ellipse, the end points d and d3 are symmetrical about the minor axis of the ellipse, the end points e and e1 are symmetrical about the major axis of the ellipse, the end points e1 and f1 are symmetrical about the minor axis of the ellipse, the end points f1 and f are symmetrical about the major axis of the ellipse, and the end points f and e are symmetrical about the minor axis of the ellipse; the curvature radii of the arc ab and the arc a1b1 are both R1, and the arc length angles are both 9.6 degrees; the curvature radiuses of the circular arc bc, the circular arc ac1, the circular arc a1c2 and the circular arc b1c3 are all R2, and the arc length angles are all 18.9 degrees; the curvature radii of the circular arc cd, the circular arc c1d1, the circular arc c2d2 and the circular arc c3d3 are all R3, and the arc length angles are all 7.8 degrees; the curvature radiuses of the arc de, the arc d1e1, the arc d2f1 and the arc d3f are all R4, and the arc length angles are all 20.2 degrees; the curvature radiuses of the arc ef and the arc e1f1 are both R5, and the arc length angle is both 76.6 degrees;
step two, dividing the elliptical ring shell into eight sections of variable curvatures for rolling: the elliptical ring shell is divided into eight arc plate shells including a first arc plate, a second arc plate, a third arc plate, a fourth arc plate, a fifth arc plate, a sixth arc plate, a seventh arc plate and an eighth arc plate in sequence by four connecting lines of coc2, eof1, foe1 and c3oc 1; the first circular arc plate and the fifth circular arc plate are in the same section and are rolled by a curvature radius R5; the third circular arc plate and the seventh circular arc plate are in the same section and are respectively rolled by the continuous variable curvature of curvature radiuses R2, R1 and R2 in sequence and in sequence; the second circular arc plate, the fourth circular arc plate, the sixth circular arc plate and the eighth circular arc plate are all the same in section, and are respectively rolled by continuously and circularly changing curvature in sequence according to curvature radiuses R3 and R4;
step three, assembling the arc plate shell: firstly, marking out the contour line of a standard ellipse on a steel platform, arranging 26-36 small steel blocks at the same interval along the contour line of the standard ellipse, and adjusting the elevations of all the small steel blocks to be consistent by using a level gauge; before assembly, a plurality of spaced baffles are uniformly arranged on the inner side of the contour line of the standard ellipse, and the ends of the baffles are tightly attached to the contour line of the standard ellipse; after all the small steel blocks and the baffle plates are adjusted, the small steel blocks and the baffle plates are spot-welded on the steel platform; when assembling, the first arc plate, the fifth arc plate, the third arc plate and the seventh arc plate are assembled firstly, and then the second arc plate, the fourth arc plate, the sixth arc plate and the eighth arc plate are assembled;
step four, locally correcting the curvature of the circular arc plate shell: after the eight arc plate shells are assembled, finding out deviation positions of the contour lines of the arc plate shells and the contour lines of the standard ellipse, and correcting; in step four, adopt interior limiting plate, outer limiting plate and wedge steel bloom right the camber of circular arc board casing is rectified: if the contour line of the arc plate shell is positioned on the outer side of the contour line of the standard ellipse, the outer limiting plate is spot-welded on the steel platform on the outer side of the arc plate shell, and the wedge-shaped steel block is driven into a space between the outer limiting plate and the arc plate shell through a sledge hammer until the contour line of the arc plate shell is coincided with the contour line of the standard ellipse; if the contour line of the circular arc plate shell is positioned on the inner side of the contour line of the standard ellipse, the inner limiting plate is spot-welded on the steel platform on the inner side of the circular arc plate shell, and the wedge-shaped steel block is driven into the space between the inner limiting plate and the circular arc plate shell through a sledge hammer until the contour line of the circular arc plate shell is coincided with the contour line of the standard ellipse;
step five, installing a supporting structure on the arc plate shell: after the local correction of the circular arc plate shell is completed, tack welding is carried out on eight longitudinal welding seams of the circular arc plate shell, and then three supporting structures are arranged on the center line of the short shaft of the circular arc plate shell from bottom to top at intervals;
step six, assembling and spot-welding external reinforcing ribs and the elliptical ring shell: respectively assembling a T-shaped reinforcing ring and a rib plate on the elliptical ring shell, performing tack welding on a web plate and the elliptical ring shell, and then performing tack welding on the rib plate, the elliptical ring shell and the web plate;
step seven, welding the elliptical ring shell: a plurality of longitudinal welding lines of the elliptical ring shell are respectively welded, the cover surface layer welding lines filled during welding are respectively welded in separate channels, and the inter-channel temperature and the interlayer temperature are less than or equal to 30 degrees;
step eight, welding the external reinforcing ribs and the elliptical ring shell: and welding the T-shaped reinforcing ring and the elliptical ring shell, and welding the rib plate and the elliptical ring shell.
2. The method for manufacturing the thick plate corner section elliptical ring for the large-scale low-temperature wind tunnel according to claim 1, characterized in that in step one, the local maximum curvature deviation of sixteen sections of circular arcs and the standard ellipse is less than 3mm.
3. The method for manufacturing the thick plate corner section elliptical ring for the large-scale low-temperature wind tunnel according to claim 1, wherein in the second step, each circular arc plate shell is rolled by a straight steel plate, and the length of the straight steel plate is greater than the length of a segmented arc length corresponding to each circular arc plate shell on the standard elliptical.
4. The method for manufacturing the thick plate corner section elliptical ring for the large-scale low-temperature wind tunnel according to claim 1, characterized in that in step two, after the first arc plate, the fifth arc plate, the third arc plate and the seventh arc plate are rolled by a four-roll plate rolling machine, the excess lengths at the two ends of each arc plate shell are removed according to the corresponding sectional arc lengths of each arc plate shell on the standard elliptical by taking the center line of each arc plate shell as a reference; and the second arc plate, the fourth arc plate, the sixth arc plate and the eighth arc plate take the corresponding variable curvature positions as references, and redundant lengths at two ends of each arc plate shell are removed according to the sectional arc lengths corresponding to the arc plate shells on the standard ellipse.
5. The method for manufacturing the thick plate corner section elliptical ring for the large-scale low-temperature wind tunnel according to claim 1, wherein in step five, each support structure is composed of an arc-shaped horse plate and a circular tube, the circular tube is arranged on a central line of a short shaft of the arc-shaped plate shell, the arc-shaped horse plates are respectively welded at two ends of the circular tube, and the arc-shaped horse plates are spot-welded on the inner wall of the corresponding arc-shaped plate shell.
6. The method for manufacturing the thick plate corner section elliptical ring for the large-scale low-temperature wind tunnel according to claim 1, characterized in that in step five, the uppermost support structure is 90-110 mm away from the end of the circular arc plate shell, the lowermost support structure is 90-110 mm away from the end of the circular arc plate shell, and the support structures in the middle are respectively the same in distance to the other two support structures.
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| CN113664441B (en) * | 2021-08-26 | 2023-06-13 | 武汉一冶钢结构有限责任公司 | Low-temperature wind tunnel inner layer connecting ring splice welding device and inner layer connecting ring splice welding method |
| CN113732547B (en) * | 2021-09-17 | 2022-09-02 | 中船黄埔文冲船舶有限公司 | Transition seat welding method |
| CN114211214B (en) * | 2022-02-21 | 2022-04-19 | 中国空气动力研究与发展中心高速空气动力研究所 | Wind tunnel complex curved surface contraction section forming method |
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| JPS58196178A (en) * | 1982-05-10 | 1983-11-15 | Sumitomo Metal Ind Ltd | Manufacture of cylindrical steel plate shell |
| JPS5987927A (en) * | 1982-11-10 | 1984-05-21 | Nippon Kokan Kk <Nkk> | Forming device of cylindrical ring |
| CN102166590A (en) * | 2010-02-26 | 2011-08-31 | 彭智祥 | Annular steel plate and manufacturing process thereof |
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| CN106500949B (en) * | 2016-10-31 | 2019-01-29 | 武汉一冶钢结构有限责任公司 | A kind of wind-tunnel round corner section elliptical ring shell forming method |
| CN109406088B (en) * | 2018-10-31 | 2021-06-01 | 沪东中华造船(集团)有限公司 | Manufacturing method of automobile wind tunnel diffusion section with steel runner |
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Effective date of registration: 20240701 Address after: Box 15, no.6, south section of the Second Ring Road, Mianyang, Sichuan 621900 Patentee after: Institute of High Speed Aerodynamics, China Aerodynamic Research and Development Center Country or region after: China Patentee after: WUHAN YIYE STEEL STRUCTURE Co.,Ltd. Address before: 430415 Yangluo Economic Development Zone Yuanmeng North Road, Xinzhou District, Wuhan City, Hubei Province Patentee before: WUHAN YIYE STEEL STRUCTURE Co.,Ltd. Country or region before: China |