CN112743302B - Method for controlling forming precision of large-diameter-thickness-ratio non-uniform sunken milling grid wallboard - Google Patents
Method for controlling forming precision of large-diameter-thickness-ratio non-uniform sunken milling grid wallboard Download PDFInfo
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Abstract
The invention provides a method for controlling the forming precision of a large-diameter-thickness-ratio non-uniform plunge milling grid wallboard, which comprises the following steps: s1, milling the wall plates of the cylinder sections; s2, carrying out PE plate combination layout operation; s3, performing four-axis roll bending over-curvature forming operation; s4, removing allowance; s5, manufacturing a partition mechanical sizing device; s6, performing annular mechanical shape correction operation; and S7, performing course correction operation. According to the method for controlling the forming precision of the large-radius-thickness-ratio non-uniform sunken milling grid wallboard, the four-axis roll bending difference thick combined packing process, the over-curvature forming control and the partition (annular direction and course direction) mechanical shape correction database of the large-radius-thickness-ratio non-uniform sunken milling grid wallboard are formed, the forming precision of the non-uniform sunken milling grid wallboard is ensured, the consistency and the reliability of products are improved, the defects caused by artificial finishing and manual production are effectively avoided, the efficient and rapid production mode is realized, and the model period is ensured.
Description
Technical Field
The invention belongs to the technical field of mechanical milling grid wallboard forming, and particularly relates to a large-diameter-thickness-ratio non-uniform sunken milling grid wallboard forming precision control method.
Background
The carrier rocket storage box structure is formed by splicing a plurality of milling barrel section wall plates, a short shell wall plate, an ellipsoid bottom, a forked ring and an end frame, and the modular development of 5m, 3.35m and 2.25m is realized, wherein the milling barrel section wall plates are used as important component parts of the storage box and occupy 60 percent of the weight of the storage box. In order to ensure the lateral rigidity and axial load bearing of the cylinder section and to take account of the weight reduction effect, the wall plate of the several-milling cylinder section is usually designed into a large sunken grid and a local boss reinforced area structure, as shown in fig. 1. The thickness difference exists between a welding area and a skin thin area in the cross section, the thickness difference is a non-uniform thickness structure, the course height reaches 1869mm, the thin area is 3.7mm, the thickness of the welding area is 5.5mm, the inner bending radius is R1669mm, the material is 2195 aluminum lithium high-strength aluminum alloy, the specific strength is high, the resilience is large, and auxiliary ribs are arranged on the welding area in the forming process to weaken the strength difference between the grid area and the welding area caused by the suspended structure;
a four-axis roll bending forming process, a creep age forming process and an integral filling forming process are mainly adopted for forming a large-size thin-wall-thickness rib milling barrel section wall plate; the four-axis roll bending forming process is widely applied under the conditions of equal curvature radius of thick plates and the like, has higher precision control, but has the advantages and the disadvantages when the large-size thin-wall-thickness rib number milling cylinder section wall plate is formed; the creep age forming technology needs to use large-scale tools and autoclave equipment, has small residual stress and high surface precision, but is limited by the tools and the production efficiency; roll bending forming of the integral filler has high requirements on material characteristics such as elastic modulus, yield strength and the like of the auxiliary filler, the integral filler is usually specially developed, meanwhile, integral filling of a large-size grid thin area is involved, demolding is more complicated, and actual production efficiency is low, and the roll bending forming method specifically comprises the following steps: roll bending forming has the advantages that: the process is mature, and the application range is wide; roll bending forming defects: the straightness of the welding area is poor; the radian clearance between the upper end and the lower end of the ship and the grid area is larger; later manual finishing is large; creep age forming advantages: residual stress in the part is almost completely released, the size stability of the formed part is good, and the welding residual stress is effectively reduced; the surface quality of the formed part is high; manual finishing is not needed, and appearance difference caused by manual shape correction is avoided; creep age forming disadvantages: special tools need to be designed; the deformation is large, the curvature radius is small, the pre-forming and creep aging correction are needed, and the process is long; the aging treatment is needed, the production efficiency is low, and the energy consumption is high; the integral filling material has the advantages of roll bending forming: the placement is convenient and the operability is strong; the ribs are protected to prevent instability; the integral filling material has the defects of roll bending forming: the requirement on a filler medium is high, the rebound quantity is restricted, the selection is difficult, and the cost investment is large; the radius of curvature is gradually reduced, the matching part of the filler medium and the metal grid slides, the demoulding operation is more complicated, and the production efficiency is lower.
Disclosure of Invention
In view of the above, the invention aims to provide a method for controlling the forming precision of a large-diameter-thickness-ratio non-uniform sunken milling grid wallboard, which is used for researching a four-axis roll bending differential thickness combined filler process and a partitioned mechanical shape correction control method based on a forming profile deviation area by combining the structural characteristics of the large-diameter-thickness-ratio non-uniform sunken milling grid wallboard and a four-axis roll bending forming and integral filler roll bending forming rule, establishing a differential thickness combined filler process design scheme, process parameter control, shape correction position sequence and feeding parameters to form a full-process parameter database, ensuring the forming precision of the large-diameter-thickness-ratio non-uniform sunken milling grid wallboard, solving the straightness and radian deviation, realizing full-mechanical operation, avoiding artificial influence and improving the product precision and reliability.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a large diameter-thickness ratio non-uniform sink milling grid wallboard forming precision control method comprises the following steps:
s1, milling a plurality of cylinder section wall plates (1);
s2, carrying out PE plate combination layout operation on the log milling barrel section wall plates;
s3, performing four-axis roll bending over-curvature forming operation on the wall plates of the plurality of milling cylinder sections subjected to PE plate combined layout;
s4, removing allowance of the wall plates of the plurality of milling barrel sections after the four-axis roll bending over curvature forming operation;
s5, manufacturing a partition mechanical shape correcting device aiming at the wall plates of the plurality of milling barrel sections;
s6, performing annular mechanical shape correction operation on the wall plate of the plurality of milling barrel sections subjected to the four-axis roll bending over curvature forming operation through a partition mechanical shape correction device;
and S7, performing course shape correction operation on the plurality of milling cylinder section wall plates subjected to the circular mechanical shape correction operation to form a large-diameter-thickness-ratio non-uniform sinking milled grid wall plate finished product.
Further, the PE board composition layout operation in step S2 includes the steps of:
a1, distributing a plurality of PE plates in a 300-400mm area of a wall plate end of a plurality of milling cylinder sections, uniformly distributing the PE plates along the course, and avoiding a boss area;
a2, setting the reasonable thickness of the PE plate according to the material characteristics, namely H is more than or equal to 2H, wherein H is the height difference between a thick welding area and a thin welding area;
a3, controlling the clearance L between the PE plate and the welding thick area to be 15-25 mm;
a4, adopting a step-shaped transition structure for the PE plates which are adjacent to the annular middle area, wherein the angle range of the step-shaped transition structure is 10-15 degrees.
Further, the four-axis roll bending over curvature forming operation in step S3 includes the steps of:
b1, adjusting the gap input value of the upper roller and the lower roller of the four-shaft roll bending machine to be 2mm larger than the welding thick area;
b2, the staff inputs and adjusts the pressing amount of the left roller and the right roller in sequence: the pressing amount of the left side roller and the right side roller is respectively 20mm, 15mm, 10mm, 5mm, 3mm and 2mm as selected values, the successive feeding and the progressive forming are carried out, and the small pressing amount is used as the principle in the later pass;
b3, controlling the pressing amount of the left roller and the right roller according to the structural form and the forming stress distribution balance mechanism so as to control the curvature radius of the formed wall plate of the multiple milling barrel section, ensuring that the curvature radius of the formed wall plate 1 of the multiple milling barrel section is 20-30mm smaller than the actual curvature radius, and ensuring the plastic deformation degree by reducing the curvature radius.
Further, in step S5 subregion machinery school shape device includes the balancing weight of rack and top, the cylinder, the kicking block, the scale, the guide rail, 2 support columns and a plurality of roller, a plurality of roller evenly arranges to the rack along the annular direction, roller one side is equipped with 2 support columns, 2 support columns are used for supporting the number and mill a section of thick bamboo wallboard, the roller opposite side is equipped with the guide rail, 2 support columns, the equal parallel arrangement of guide rail three, and 2 support columns, the equal perpendicular to rack in guide rail bottom, the guide rail is close to 2 support column one side sliding connection cylinders, the telescopic link outer wall cover of cylinder is equipped with the scale, the telescopic link top fixed connection kicking block of cylinder, the cylinder mills a section of thick bamboo wallboard school shape through the kicking block number, the cylinder top is connected to the balancing weight through the assembly pulley.
Further, the hoop machine shaping operation in step S6 includes the steps of:
c1, moving the wall plates of the milling barrel sections to rollers of a partition mechanical shape correcting device by adopting linear distribution of annular radian control points;
c2, controlling the cylinder to ascend to the center of the wall plates of the plurality of milling barrel sections, and positioning the measuring position point of the top block at the center point of the wall plates of the plurality of milling barrel sections;
c3, carrying out three-point bending and shape correction on the wall plate of the logarithmic milling barrel section, and carrying out linear balance transition from the central point to the welding thick area in the shape correction implementation process;
further, the heading correction operation in step S7 includes the following steps:
d1, according to the measured data after the control of the circumferential radian, the moving cylinder finely adjusts the upper end of the log milling barrel section wall plate in the course direction, and the shape correction area is located in the junction area of the upper end of the welding thick area and the upper end of the thin area;
d2, according to the deviation value in the step D1, repeating the operation in the step D1 to shape the lower end of the log milling barrel section wall course.
Compared with the prior art, the method for controlling the forming precision of the non-uniform sinking milling grid wall plate with the large diameter-thickness ratio has the following advantages:
(1) according to the method for controlling the forming precision of the large-radius-thickness-ratio non-uniform sunken milling grid wallboard, the large-radius-thickness-ratio non-uniform sunken milling grid wallboard forming precision control method is adopted, a four-axis roll bending difference thickness combined packing process and a partition (annular direction and course direction) mechanical correction database of the large-radius-thickness-ratio non-uniform sunken milling grid wallboard are formed, the forming precision of the non-uniform sunken milling grid wallboard is ensured, the consistency and reliability of a product are improved, the defects caused by artificial finishing and manual production are effectively avoided, a high-efficiency and rapid production mode is realized, and the model period is ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a sectional view of a structure of a multi-milling barrel section wall plate and a PE plate according to a method for controlling the forming accuracy of a non-uniform plunge milling grid wall plate with a large radius-thickness ratio according to an embodiment of the present invention;
FIG. 2 is a front view of a structure of a multi-milling barrel section wall plate and a PE plate according to a large radius-thickness ratio non-uniform plunge milling grid wall plate forming accuracy control method in the embodiment of the invention;
FIG. 3 is a curvature control cross-sectional view of a four-axis roll bending differential thickness combined filler according to a large radius-thickness ratio non-uniform sinking milling grid wall plate forming accuracy control method in an embodiment of the invention;
fig. 4 is a schematic diagram of circumferential shape correction of a partitioned mechanical shape correction device according to a large radius-thickness ratio non-uniform plunge milling grid wall plate forming accuracy control method in an embodiment of the present invention;
fig. 5 is a schematic view of course shape correction of a partitioned mechanical shape correction device according to the method for controlling the forming accuracy of a large radius-thickness ratio non-uniform sink milling grid wall plate in the embodiment of the invention.
Description of reference numerals:
1-milling wall plates of the cylinder sections; 11-welding a thick area; 12-thin zones; 13-PE board; 14-a boss; 2-four-axis roll bending machine; 21-upper roll; 22-lower roll; 23-left roll; 24-right side roller; 3-a partition mechanical sizing device; 31-a bench; 32-rollers; 33-a support column; 34-a scale; 35-a counterweight block; 36-a cylinder; 37-a top block; 38-guide rail.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "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 the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 to 5, a method for controlling the forming accuracy of a non-uniform plunge milling grid wallboard with a large radius-thickness ratio comprises the following steps:
s1, mechanically milling the non-uniform sunken cylinder section wall plates to form large-diameter-thickness-ratio non-uniform sunken milling grid wall plates, namely a multi-milling cylinder section wall plate 1;
s2, selecting a PE plate as a filling medium, wherein the PE plate (polyethylene) has high rigidity and toughness, good mechanical strength and wide market application;
s3, carrying out PE plate combination layout operation on the log milling barrel section wall plate 1;
s4, performing four-axis roll bending over-curvature forming operation on the wall plate 1 of the plurality of milling cylinder sections after the PE plate combined layout;
s5, removing allowance of the wall plate 1 of the plurality of milling barrel sections after the four-axis roll bending over curvature forming operation;
s6, manufacturing a partitioned mechanical shape correcting device 3 aiming at the wall plates 1 of the plurality of milling barrel sections;
s7, performing annular mechanical shape correction on the multi-milling barrel section wall plate 1 subjected to the four-axis roll bending over curvature forming operation through the partition mechanical shape correction device 3;
s8, performing course correction operation on the multi-milling barrel section wall plate 1 subjected to the annular mechanical correction operation;
and S9, forming a finished product of the non-uniform sinking milled grid wallboard with the large diameter-thickness ratio.
The forming precision control process flow of the large diameter-thickness ratio non-uniform sinking milling grid wall plate mainly comprises the following steps: the method for controlling the forming precision of the large-diameter-thickness-ratio non-uniform sunken milling grid wallboard comprises the steps of milling non-uniform sunken milling grid wallboards, combining fillers, roll bending forming, removing allowance and finishing, a four-axis roll bending difference thick combined filler process and a partitioned (circumferential and course) mechanical correction database of the large-diameter-thickness-ratio non-uniform sunken milling grid wallboard are formed by adopting a large-diameter-thickness-ratio non-uniform sunken milling grid wallboard forming precision control method, the forming precision of the non-uniform sunken milling grid wallboards is ensured, the consistency and the reliability of products are improved, the defects caused by artificial finishing and production are effectively avoided, a high-efficiency and quick production mode is realized, and the model period is ensured.
The PE board composition layout operation in step S3 includes the steps of:
a1, arranging a plurality of PE plates 13 in a 300-plus-400 mm area of the end of a wall plate 1 of a plurality of milling barrel sections, uniformly distributing the PE plates along the course, and avoiding a boss 14 area, wherein the uniform course distribution is the flight direction of a rocket, namely the height direction, because the radian deviation of 300mm away from two ends of an annular welding area is about 18mm, mutual restriction is difficult to reach balance, and the precision is poor, the square PE plates 13 are arranged in a combined mode, the outer drum-shaped appearance is formed at the thin-thick junction of the milling grid wall plate according to the large diameter-thickness ratio and non-uniform sinking, the radian meets the requirement of 2mm, but the straightness deviation is about 25mm, and after repeated finishing, the straightness meets the requirement of 2 mm;
a2, setting the thickness of the PE plate 13 reasonably according to the material characteristics, namely H is more than or equal to 2H, wherein H is the height difference between the welding thick area 11 and the welding thin area 12;
a3, controlling the clearance L between the PE plate 13 and the welding thick area 11 to be 15-25mm, and avoiding the slippage of the PE plate in the roll bending process;
a4, the PE plates 13 which are arranged in a combined mode and are adjacent to the annular middle area adopt a step-shaped transition structure, the angle range of the step-shaped transition structure is 10-15 degrees, edges and corners at the back are avoided, and the transition is not smooth.
The four-axis roll bending over-curvature forming operation in step S4 includes the steps of:
b1, adjusting the gap input value of the upper roller 21 and the lower roller 22 of the four-axis roll bending machine 2 to be 2mm larger than the welding thick area 11, so as to form friction with the left roller 23, the right roller 24 and the wall plate 1 of the milling barrel section, and facilitating the rotary feeding to avoid the phenomenon that the wall plate 1 of the milling barrel section is thinned under the clamping of the upper roller and the lower roller or is folded due to the lifting of the side shaft;
b2, the worker sequentially inputs and adjusts the pressing amounts of the left roller 23 and the right roller 24: the pressing amounts of the left roller 23 and the right roller 24 are respectively 20mm, 15mm, 10mm, 5mm, 3mm and 2mm as selected values, the progressive feeding and the progressive forming are carried out, and the small pressing amount is used as a principle in the later pass;
b3, controlling the pressing amount of the left side roller 23 and the right side roller 24 according to the structural form and the forming stress distribution balance mechanism, so as to control the curvature radius of the formed wall plate 1 of the multiple milling barrel section, ensuring that the curvature radius of the formed wall plate 1 of the multiple milling barrel section is actually smaller than 20-30mm, ensuring the plastic deformation degree by reducing the curvature radius, reducing the rebound and realizing the large-proportion plastic deformation of a thin area.
The pre-forming precision of the four-axis roll bending is realized by influencing parameters such as the clamping clearance of an upper roller and a lower roller, the pressing amount of a side roller, the control of the curvature radius after forming and the like, and the roll bending is controlled according to the precision requirement of a designed profile because of the limitation of the structure of a milling grid wallboard with a large diameter-thickness ratio and non-uniform sinking, the subsequent allowance removal is carried out for shape correction, the straightness and the radian are mutually restricted, and the precision requirement is difficult to achieve. The four-axis roll bending difference and thickness combined filler roll bending process is controlled, the plastic deformation proportion of the thin area 12 is improved, the resilience is reduced, and the precision control of the whole process is realized.
The partitioned mechanical shape correcting device 3 in step S6 includes a rack 31, a counterweight 35 above the rack, an air cylinder 36, a top block 37, a scale 34, a guide rail 38, 2 support columns 33, and a plurality of rollers 32, wherein the rollers 32 are uniformly distributed on the rack 31 along an annular direction, one side of each roller 32 is provided with 2 support columns 33, the 2 support columns 33 are used for supporting the milling barrel section wall plates 1, the other side of each roller 32 is provided with a guide rail 38, the 2 support columns 33 and the guide rail 38 are all arranged in parallel, the bottoms of the 2 support columns 33 and the guide rail 38 are all perpendicular to the rack 31, one side of each guide rail 38 close to the 2 support columns 33 is slidably connected with the air cylinder 36, the outer wall scale 34 of the telescopic rod of the air cylinder 36 is sleeved with the top end of the telescopic rod of the air cylinder 36 and is fixedly connected with the top block 37, the air cylinder 36 corrects the milling barrel section wall plates 1 through the top of the top block 37, the air cylinder 36 is connected to the counterweight 35 through a pulley block, and the support columns 33 are wrapped by foam pads, the surface quality of the wall plate 1 of the milling barrel section is protected, the partition mechanical shape correction control method controls the path of the air cylinder 36 on the guide rail 38 according to the wall plate shape correction system, local partition shape correction is carried out on the course height and the annular direction of the non-uniform sunken milling grid wall plate with the large radius-thickness ratio, the integral shape measurement is preferentially carried out on the wall plate 1 of the milling barrel section through a linear ruler and a radian sample plate before implementation, and the deviation value is recorded.
The hoop machine sizing operation in step S7 includes the steps of:
c1, moving the wall plates 1 of the milling barrel sections to the rollers 32 of the sectional mechanical shape correcting device 3 by adopting linear distribution of annular radian control points, and erecting the wall plates 1 of the milling barrel sections on the rollers 32 when in actual use so as to facilitate annular movement;
c2, controlling the cylinder 36 to ascend to the center of the wall plates 1 of the milling barrel sections, and positioning the measuring position point of the top block 37 at the center of the wall plates 1 of the milling barrel sections to avoid pressing into the thin area 12 to generate cracks;
c3, carrying out three-point bending and shape correction on the wall plate 1 of the logarithmic milling barrel section, carrying out linear balance transition from a central point to the welding thick area 11 in the shape correction implementation process, namely carrying out three-point bending and shape correction on the wall plate 1 of the logarithmic milling barrel section along the horizontal direction, switching on an air source by an air cylinder 36 to control the feeding amount of the top block 37 to be 185-190 mm, measuring the linear radian gap value of the wall plate 1 of the logarithmic milling barrel section, circularly moving the wall plate 1 of the logarithmic milling barrel section to carry out the same operation shape correction again to realize point-by-point progressive deformation, and when carrying out shape correction on the welding thick area 11, controlling the feeding amount of the top block 37 to be 190-195 mm by the air cylinder 36 due to larger resilience, thereby greatly optimizing the straightness of the outer drum;
the heading correction operation in step S8 includes the steps of:
d1, according to the measured data after the control of the circumferential radian, the moving cylinder 36 finely adjusts the upper end of the log milling barrel section wall plate 1 in the course direction, the shape correction area is located in the junction area of the upper end of the welding thick area 11 and the upper end of the thin area, the linear balance transition is carried out from the middle area to the welding thick area 11, the middle control feed amount in the shape correction process is 190-195 mm, the measurement of the straightness and the radian is carried out after the shape correction, and the deviation value is recorded;
d2, according to the deviation value of the step D1, repeating the operation of the step D1 to shape the lower end of the heading of the logarithmic milling barrel section wall plate 1, similarly performing linear balance transition from a middle area to a welding thick area 11, controlling the feeding amount to be 190-195 mm in the middle of the shape correction process, measuring the straightness and the radian after shape correction, and recording the deviation value.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A large diameter-thickness ratio non-uniform sink milling grid wallboard forming precision control method is characterized by comprising the following steps: the method comprises the following steps:
s1, milling a plurality of cylinder section wall plates (1);
s2, carrying out PE plate (13) combination layout operation on the log milling barrel section wall plate (1);
s3, performing four-axis roll bending over curvature forming operation on the wall plates (1) of the plurality of milling cylinder sections after the PE plates (13) are combined and distributed;
s4, performing allowance removing operation on the wall plates (1) of the plurality of milling barrel sections after the four-axis roll bending curvature forming operation;
s5, manufacturing a partition mechanical shape correcting device (3) for the log milling barrel section wall plate (1);
s6, performing annular mechanical sizing operation on the wall plate (1) of the milling barrel section after the four-axis roll bending over-curvature forming operation through a zoning mechanical sizing device (3);
s7, performing course correction operation on the multi-milling barrel section wall plate (1) subjected to the hoop mechanical correction operation to form a large radius-thickness ratio non-uniform sinking milling grid wall plate finished product;
the PE board (13) composite layout operation in step S2 includes the steps of:
a1, arranging a plurality of PE plates (13) in a 400mm area of 300-;
a2, setting the thickness of the PE plate (13) reasonably according to the material characteristics, namely H is more than or equal to 2H, wherein H is the height difference between the thick welding area (11) and the thin welding area (12);
a3, controlling the clearance L between the PE plate (13) and the welding thick area (11) to be 15-25 mm;
a4, the PE plates (13) which are arranged in a combined mode and are adjacent to the annular middle area adopt a step-shaped transition structure, and the angle range of the step-shaped transition structure is 10-15 degrees.
2. The method for controlling the forming precision of the non-uniform plunge milling grid wall plate with the large radius-thickness ratio as claimed in claim 1, wherein the method comprises the following steps: the four-axis roll bending over curvature forming operation in step S3 includes the steps of:
b1, adjusting the gap input values of an upper roller (21) and a lower roller (22) of the four-shaft roll bending machine (2) to be 2mm larger than the welding thick area (11);
b2, the worker sequentially inputs and adjusts the pressing amount of the left roller (23) and the right roller (24): the pressing amounts of the left roller (23) and the right roller (24) are respectively 20mm, 15mm, 10mm, 5mm, 3mm and 2mm as selected values, the successive feeding and the progressive forming are carried out, and the small pressing amount is used as the principle in the later pass;
b3, controlling the pressing amount of the left roller (23) and the right roller (24) according to the structural form and the forming stress distribution balance mechanism so as to control the curvature radius of the formed wall plate (1) of the multiple milling barrel section, ensuring that the curvature radius of the formed wall plate (1) of the multiple milling barrel section is 20-30mm smaller than the actual curvature radius, and ensuring the plastic deformation degree by reducing the curvature radius.
3. The method for controlling the forming precision of the non-uniform plunge milling grid wall plate with the large radius-thickness ratio as claimed in claim 1, wherein the method comprises the following steps: the partitioned mechanical shape correcting device (3) in the step S5 comprises a rack (31), a balancing weight (35) above the rack, a cylinder (36), a top block (37), a scale (34), a guide rail (38), 2 support columns (33) and a plurality of rollers (32), wherein the rollers (32) are uniformly distributed to the rack (31) along the annular direction, one side of each roller (32) is provided with 2 support columns (33), the 2 support columns (33) are used for supporting the milling barrel section wall plates (1), the other side of each roller (32) is provided with the guide rail (38), the 2 support columns (33) and the guide rail (38) are arranged in parallel, the bottoms of the 2 support columns (33) and the guide rail (38) are perpendicular to the rack (31), one side of the guide rail (38) close to the 2 support columns (33) is sleeved with the sliding connection cylinder (36), the scale (34) is arranged on the outer wall of a telescopic rod of the cylinder (36), and the top end of the telescopic rod of the cylinder (36) is fixedly connected with the top block (37), the cylinder (36) is used for correcting the shape of the cylindrical milling section wall plate (1) through the jacking block (37), and the upper part of the cylinder (36) is connected to the balancing weight (35) through a pulley block.
4. The method for controlling the forming precision of the non-uniform plunge milling grid wall plate with the large radius-thickness ratio as claimed in claim 3, wherein the method comprises the following steps: the hoop machine sizing operation in step S6 includes the steps of:
c1, moving the wall plates (1) of the milling barrel sections to a roller (32) of a sectional mechanical shape correcting device (3) by adopting linear distribution of annular radian control points;
c2, controlling the cylinder (36) to ascend to the center of the wall plates (1) of the plurality of milling barrel sections, and positioning the measuring position point of the top block (37) at the center point of the wall plates (1) of the plurality of milling barrel sections;
c3, performing three-point bending and shape correction on the wall plate (1) of the logarithmic milling barrel section, and performing linear balance transition from a central point to the welding thick area (11) in the shape correction implementation process.
5. The method for controlling the forming precision of the non-uniform plunge milling grid wall plate with the large radius-thickness ratio as claimed in claim 3, wherein the method comprises the following steps: the heading correction operation in step S7 includes the steps of:
d1, according to the measured data after the control of the circumferential radian, the upper end of the log milling barrel section wall plate (1) in the course direction is finely adjusted by a moving cylinder (36), a shape correction area is positioned in a junction area between the upper end of a welding thick area (11) and the upper end of a thin area (12), linear balance transition is carried out from a middle area to the welding thick area (11), the middle control feed amount in the shape correction process is 190-195 mm, straightness and radian measurement is carried out after shape correction, and a deviation value is recorded;
d2, according to the deviation value in the step D1, the operation in the step D1 is repeated to shape the lower end of the heading direction of the log milling barrel section wall plate (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011607435.4A CN112743302B (en) | 2020-12-29 | 2020-12-29 | Method for controlling forming precision of large-diameter-thickness-ratio non-uniform sunken milling grid wallboard |
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| US5611128A (en) * | 1995-04-28 | 1997-03-18 | Wirtz Manufacturing Co., Inc. | Battery grids, method and apparatus |
| CN102974671B (en) * | 2012-11-28 | 2015-08-05 | 上海飞机制造有限公司 | A kind of rolling forming method of sheet-metal component |
| CN104439968B (en) * | 2014-11-24 | 2015-08-12 | 首都航天机械公司 | A kind of large-scale tank cylinder section integral manufacturing method based on the milling of numerical control mirror image |
| CN106180247B (en) * | 2016-08-04 | 2018-01-02 | 吉林大学 | A kind of high muscle aluminium alloy wallboard manufacture method |
| CN106425297B (en) * | 2016-10-14 | 2018-11-23 | 首都航天机械公司 | A kind of outer grid siding numerical control processing technology method |
| CN109877211A (en) * | 2019-04-01 | 2019-06-14 | 西北工业大学 | A kind of band muscle siding filler electromagnetic forming method |
| CN112058961B (en) * | 2020-08-20 | 2022-02-11 | 中国商用飞机有限责任公司 | Method, apparatus and medium for roll forming of monolithic wall panels |
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