CN110524190B - Manufacturing method of bent square and rectangular tube - Google Patents
Manufacturing method of bent square and rectangular tube Download PDFInfo
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- CN110524190B CN110524190B CN201910639709.9A CN201910639709A CN110524190B CN 110524190 B CN110524190 B CN 110524190B CN 201910639709 A CN201910639709 A CN 201910639709A CN 110524190 B CN110524190 B CN 110524190B
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- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention provides a method for manufacturing a bent square tube, which comprises the following steps: completing a three-dimensional model of the bent square tube through three-dimensional design software; designing a support jig frame corresponding to the bending shape of a bottom wall plate of the three-dimensional model of the bent square tube at the bottom of the three-dimensional model, and determining the size structure for manufacturing the support jig frame; obtaining a lofting expansion diagram of each wall plate of the three-dimensional model of the bent square tube, and respectively cutting and blanking each wall plate; and assembling each wall plate obtained after blanking on a supporting jig frame to obtain a bent square pipe. The manufacturing method can avoid weakening the rigidity of the structure of the square and rectangular tube due to the fact that the thickness of the tension side wall plate is thinned during bending in the intermediate-frequency heating bending method, does not generate machining stress in the machining process, can reduce machining cost, and can improve production efficiency and economic benefits.
Description
Technical Field
The invention relates to the technical field of pipe manufacturing, in particular to a manufacturing method of a bent square and rectangular pipe.
Background
In the design of architectural appearance modeling of modern large theaters, gymnasiums, bridge steel structures and the like, besides the requirements of stress, rigidity and stability of the structure are mainly considered, the modeling of the structure is also required to be combined to achieve the requirement of attractive appearance or realize corresponding appearance meaning. In the curved-surface-modeling steel structure, a bent square tube with a rectangular cross section is generally required to be selected and applied to an actual steel beam and steel column structure. Conventionally, a method for manufacturing a bent square tube with a rectangular cross section generally adopts special intermediate frequency heating equipment and a forming die for a square tube which is rolled and formed in a steel mill, and a processing tool is matched on special mechanical equipment to bend and form the square tube, so that the method has various limitations when a large number of square tubes are processed:
1. the square tube with the rectangular section is manufactured, the section inertia moment and the bending modulus are far larger than those of a single wall plate forming the square tube, and the larger the section bending modulus is, the larger the bending mechanical external force required to be provided by equipment is, so that the range of the size of the processing section of the equipment is limited;
2. the square and rectangular tube processed by the method has a processing stretching area and a compression area, the larger the curvature is, the longer the stretching length of the stretching area is, the larger the compression amount of the compression area is, the thickness and structural rigidity of a steel plate in the stretching area are weakened, and the compression area is easy to wrinkle or arch due to compression;
3. after machining and forming, the inertia moment of the cross section is weakened compared with the design requirement, and is not allowed in important stressed structures;
4. the curvature changes variously, the requirement of forming dies is also various, the equipment and the dies are repeatedly adjusted, the efficiency is not high, and the economic benefit is reduced.
Disclosure of Invention
Based on the defects of the prior art, the invention aims to provide a manufacturing method of a bent square and rectangular tube, which can avoid weakening the rigidity of the structure of the square and rectangular tube, does not generate processing stress in the hot processing process, can reduce the processing cost, and can improve the production efficiency and economic benefit.
Based on this, the technical scheme of the invention is as follows: a manufacturing method of a bent square tube comprises the following steps:
completing a three-dimensional model of the bent square tube through three-dimensional design software;
designing a support jig frame corresponding to the bending shape of a bottom wall plate of the three-dimensional model of the bent square tube at the bottom of the three-dimensional model, and determining the size structure for manufacturing the support jig frame;
obtaining a lofting expansion diagram of each wall plate of the three-dimensional model of the bent square tube, and respectively cutting and blanking each wall plate;
and assembling each wall plate obtained after blanking on a supporting jig frame to obtain a bent square pipe.
Optionally, the step of determining the dimensional structure of the support jig specifically includes:
selecting a plurality of sections of a bent square tube arranged on a support jig frame at certain intervals in three-dimensional design software, and taking the interval between the sections as the space size of an upright post of the support jig frame;
and acquiring the height of each of two sides of the bottom wall plate of the bent square tube on each section from the ground, taking the height as the height of the upright columns on two sides of the supporting jig frame, and determining the inclination of the jig frame surface.
Optionally, the step of assembling each wall plate obtained after blanking on a support jig to obtain a bent square tube specifically includes:
determining the placing direction of the bent square tube through three-dimensional design software, and acquiring coordinate values of a selected position of a bottom wall plate of the bent square tube so as to mark on a support jig;
positioning and mounting the blanked bottom wall plate according to the mark so as to ensure the bending degree of the bottom wall plate in the width and thickness bending directions;
and respectively assembling the two side wall plates which are well blanked on the bottom wall plate, and positioning and installing the top wall plate to form a bent square pipe.
Optionally, after the step of completing the three-dimensional model of the bent square tube by using three-dimensional design software, the method further includes: and designing a plurality of rectangular process partition plates which are arranged at intervals in the three-dimensional model of the bent square tube, wherein the rectangular process partition plates are vertical to the side surfaces of the wall plates.
Optionally, the two side wall panels that will unload respectively are in assemble on the bottom wallboard, fix a position installation top wallboard again to the step of forming crooked square pipe specifically includes:
preparing blanking of the rectangular process partition plate according to the size of the rectangular process partition plate in the three-dimensional design software;
vertically mounting the blanked rectangular process partition plates on the bottom wall plate according to the intervals in the three-dimensional model;
assembling the wall plates on two sides, so that the wall plates on two sides are respectively perpendicular to the side lines of the bottom wall plate, and the bending directions of the side lines of the wall plates on two sides are flush with the side lines of the bottom wall plate;
the plate surfaces of the wall plates on the two sides are fixedly attached to the side edges of the rectangular process partition plate;
and assembling top wall plates on the tops of the wall plates on the two sides and welding and forming.
Optionally, before assembling the bottom wall plate, the wall plates on two sides, and the top wall plate of the bent square tube on the support jig, the method further includes:
in the blanking process, the end parts of the bottom wall plate, the wall plates on two sides and the top wall plate which need to be positioned on the same side during assembly are marked so as to determine the bending direction of the bent square pipe.
Optionally, the step of determining the placing direction of the curved square tube by using three-dimensional design software, and obtaining coordinate values of the selected positions of the bottom wall plate of the curved square tube to mark on the support jig specifically includes:
selecting the head end and the tail end of the bottom wall plate of the bent square tube as datum points through three-dimensional design software, and taking a connecting line between the head end datum points and the tail end datum points as datum lines;
acquiring the height of the datum line in each section from the ground;
acquiring the distance between the two sides of the bottom wall plate on each section and the datum line;
the positions of both sides of the bottom wall plate are identified at each cross-sectional position on the jig frame surface.
Optionally, after the step of assembling the wall plates obtained after blanking on the supporting jig to obtain the bent square tube, the method further includes:
and measuring and checking the forming size of the bent square tube assembled and formed on the support jig.
Optionally, the step of measuring and checking the forming dimension of the bent square tube assembled and formed on the support jig specifically includes:
acquiring the vertical height between the tops of wall plates on two sides of a bent square tube assembled on a support jig and the reference line, and the relative distance between two end parts of the top wall plate and the bottom wall plate of the bent square tube, which are positioned on the same side;
and respectively comparing the acquired vertical height and the acquired relative distance with the design requirement size in the three-dimensional design software, and finishing welding if the design requirement is met.
Optionally, the ratio of the thickness delta of the wall plate obtained by blanking to the sectional external dimension B is less than 0.05, wherein delta is less than or equal to 14 mm. The embodiment of the invention has the following beneficial effects:
the manufacturing method of the bent square tube comprises the steps of firstly obtaining a three-dimensional model formed by the bent square tube through three-dimensional design software, accurately unfolding four wall plates of the bent square tube according to the shape and size, lofting the four wall plates in the three-dimensional design software, and cutting and blanking the four wall plates in a numerical control cutting mode, wherein the bending modulus of each wall plate in the width direction is the strong axis direction of the wall plate, and the bending radian is designed, lofted, unfolded, blanked and cut to be directly formed without machining and bending forming by mechanical equipment. The size structure of the support jig frame is obtained according to the matching of the bent square tube in the three-dimensional model and the support jig frame to manufacture, four well-blanked wallboards are assembled on the well-manufactured support jig frame respectively, the four wallboards can be bent in place by means of the rigidity of the jig frame and a simple assembly tool, the bending modulus of the wallboards in the thickness direction is the weak axis direction of the wallboards, the thickness of each wallboard is far smaller than the length, the wallboards are arranged independently, and the deformation of the wallboards on the support jig frame is very easy under the condition that the rigidity fixation is not formed between the wallboards. The process of positioning and assembling each wall plate of the bent square tube by adopting the supporting jig is very convenient, the quality is higher, and the quality detection in the later period can be favorably carried out. Compared with the conventional process, the manufacturing method of the whole bent square tube can finish the manufacturing without cold bending processing equipment and water-fire bending, has very simple manufacturing procedures, greatly reduces input equipment and auxiliary forming tools, can reduce the production cost, is convenient to use in large-scale production and processing, is favorable for improving the processing efficiency and increases the economic benefit.
Drawings
Fig. 1 is a flow chart of a method for manufacturing a bent square tube according to an embodiment of the present invention;
FIG. 2 is an elevational view of a curved square tube according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view taken at A1-A1 in FIG. 2;
FIG. 4 is a schematic cross-sectional view taken at A2-A2 in FIG. 2;
FIG. 5 is a schematic cross-sectional view taken at A3-A3 in FIG. 2;
FIG. 6 is a schematic cross-sectional view taken at A4-A4 in FIG. 2;
FIG. 7 is a schematic cross-sectional view taken at A5-A5 in FIG. 2;
FIG. 8 is a schematic of the cross-sectional structure of FIG. 2 at A6-A6.
Description of reference numerals:
1. top panel, 2, side panel, 3, bottom panel, 4, rectangular process partition, 5, reference point, 6, reference line, 7, support jig, 71, column, 72, jig surface.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Referring to fig. 1 to 8, a method for manufacturing a bent square pipe according to a preferred embodiment of the present invention specifically includes the following steps:
s1, completing a three-dimensional model of the bent square tube through three-dimensional design software;
s2, designing a supporting jig frame 7 corresponding to the bending shape of the bottom wall plate 3 at the bottom of the three-dimensional model of the bent square tube, and determining the size structure for manufacturing the supporting jig frame 7;
s3, obtaining lofting expansion diagrams of each wall plate of the three-dimensional model of the bent square tube, and respectively cutting and blanking each wall plate;
and S4, splicing the wall plates obtained after blanking on a supporting jig 7 to obtain a bent square tube.
Based on the steps, when the bent square pipe is manufactured, drawing design of a three-dimensional model is carried out on the required bent square pipe on the existing three-dimensional design software, then four wall plates of the designed three-dimensional model are accurately unfolded according to the outline dimensions and subjected to lofting treatment (the measurement and setting means in engineering measurement is that the designed position/object on the drawing is put on the position/object on the spot), namely, each wall plate of the bent square pipe on the drawing is in a formed state, the outline dimensions of the wall plate required in actual blanking are obtained through the three-dimensional design software, so that the bending of each wall plate in the width direction can be completed only by depending on the unfolding of the three-dimensional design software, certain design precision can be ensured, namely, the bending of each wall plate in the width direction can be directly obtained according to the lofting unfolding picture in the three-dimensional design software without additional bending processing, the tension area and the compression area on each wall plate can be avoided, and the phenomena of weakening of the thickness of the steel plate and the structural rigidity, compression wrinkling or arching can be prevented. After four wall plates with preset bending in the width direction are obtained, the dimensional structure of the supporting jig frame 7 positioned at the bottom of the bent square tube in the three-dimensional model is obtained according to three-dimensional design software, the supporting jig frame 7 is used as an important component for producing and forming the bent square tube and needs to have higher dimensional precision requirement, each wall plate is positioned on the manufactured supporting jig frame 7, namely the bending in the thickness direction can be obtained, the bending modulus of each wall plate in the thickness direction is smaller, the bending of the wall plate in the thickness direction can be realized by means of the rigidity of the jig frame during positioning, the operation is very simple, and the principle is reliable. The bending modulus of each wall plate in the width direction is the strong axis direction of the wall plate, the bending radian is lofted and unfolded, the wall plate can be directly formed by blanking, extra bending processing is not needed, the bending modulus of each wall plate in the thickness direction is the weak axis direction of the wall plate, and the thickness of each wall plate is far smaller than the length of each wall plate, so that under the condition that rigid fixation is not formed among the four wall plates, a single wall plate is very easy to bend in place when being positioned on the support jig frame 7. The manufacturing process of whole crooked side pipe does not need cold-bending processing, the hot and humid bending just can accomplish, and the preparation process is simple, and the equipment that need drop into and auxiliary forming's frock is very few, and the cost of manufacture is low, and production efficiency is high, and can improve economic efficiency, is fit for large-scale production and processing, can use widely.
Wherein the step of determining the dimensional structure of the support jig 7 comprises in particular:
s21, selecting a plurality of sections of the bent square tube arranged on the supporting jig frame 7 at certain intervals in three-dimensional design software, and taking the interval between the sections as the space size of the upright posts 71 of the supporting jig frame 7;
s22, obtaining the height of each of the two sides of the bottom wall plate 3 of the bent square tube at each section from the ground as the height dimension of the two side columns 71 of the supporting jig 7, and determining the inclination of the jig surface 72.
In the embodiment, six sections are selected along the length direction of the bent square tube, and the six sections can be arranged at equal intervals in the length direction or randomly selected. Obtaining the matched sectional drawing of a bent square tube and a supporting jig frame 7 at six positions according to each section, wherein a bottom wall plate 3 of the bent square tube is contacted with a jig frame surface 72 of the supporting jig frame 7, because the bottom wall plate 3 is bent in the width direction during blanking, in three-dimensional design software, when the bottom wall plate 3 is positioned on the supporting jig frame 7, the heights of two sides of the bottom wall plate 3 in the six sections from the ground are measured respectively, and six groups of data are obtained and are Q respectively1And Q4、R1And R4、S1And S4、T1And T4、U1And U4、W1And W4So that the height of the upright 71 supporting the jig frame 7 supported on both sides of the bottom wall plate 3 can be taken as the height of the upright 71 supporting the jig frame 7, and the heights of both sides have a certain difference, so that the inclination on the jig frame surface 72 supporting the jig frame 7 can be further obtained, and thereby the heights of the upright 71 and the inclination of the jig frame surface 72 at the corresponding positions of the six groups of supporting jig frames 7 are obtained through three-dimensional design software, so that the corresponding dimensional structures of the supporting jig frame 7 are obtained, and actual production manufacturing is carried out and positioning is carried out on the ground.
Optionally, the step of splicing each wall plate obtained after blanking on the support jig 7 to obtain a bent square tube specifically includes:
s41, determining the placing direction of the bent square tube through three-dimensional design software, and acquiring coordinate values of the selected positions of the bottom wall plates 3 of the bent square tube so as to mark on the support jig 7;
s42, positioning and mounting the blanked bottom wall plate 3 according to the mark to ensure the bending degree of the bottom wall plate 3 in the width and thickness bending directions;
and S43, assembling the two blanked side wall plates on the bottom wall plate 3 respectively, and positioning and installing the top wall plate 1 to form a bent square pipe.
Before the bent square pipe is assembled, a plurality of rectangular process partition plates 4 arranged at intervals need to be designed in a three-dimensional model of the bent square pipe by using three-dimensional design software through a computer, wherein the rectangular process partition plates 4 are perpendicular to the side surfaces of all wall plates, in the embodiment, the number of the rectangular process partition plates 4 is six, and the rectangular process partition plates are arranged along the length of the bent square pipe. And (3) blanking each rectangular process plate according to the size of the rectangular process plate arranged in the three-dimensional design software, and then preparing the assembly forming work of the bent square tube. Selecting any one wall plate of a bent square pipe as a reference plate in three-dimensional design software, taking the head end and the tail end of the reference plate as reference points 5, taking a connecting line between the head reference point and the tail reference point 5 as a reference line 6, and rotating the bent square pipe and a special line to the horizontal direction so as to determine the placing direction of the bent square pipeThe ends of the plate, the bottom wall plate 3, are taken as reference points 5. When the bottom wall plate 3 is positioned on the jig surface 72 supporting the jig 7, the height H of the reference line 6 from the ground is determined in six sections of the curved square tube obtained by the three-dimensional design software1、H2、H3、H4、H5And H6And the distance Q from the reference line 6 to both sides of the bottom wall plate 3 in each cross section is obtained2And Q3、R2And R3、S2And S3、T2And T3、U2And U3、W2And W3Thereby the position of location bottom wallboard 3 on supporting bed-jig 7 that can be accurate, corresponding to the support bed-jig 7 that makes, mark the position of bottom wallboard 3 on bed-jig face 72 that obtains in the three-dimensional design software, then install bottom wallboard 3 according to the mark position on supporting bed-jig 7, when bottom wallboard 3 that then the unloading obtained is fixed a position on supporting bed-jig face 72 of bed-jig 7, can carry out corresponding bending according to the trend of supporting the bed-jig, thereby need not other bending process, just can directly obtain the crooked location of bottom wallboard 3, guarantee that bottom wallboard 3 can realize the degree of curvature on width direction and thickness direction. After the bottom wall plate 3 is installed on the supporting jig frame 7, positioning and assembling are carried out on the process partition plates according to drawings in three-dimensional design software, and the process partition plates are ensured to be perpendicular to the bottom wall plate 3 and are arranged on the positions of the right sections. Assembling the wall plates 2 on the two sides of the bent square tube, adjusting the wall plates 2 on the two sides to be parallel and level with the bending direction and reference wall plate edge line, adjusting the vertical plate surfaces of the wall plates 2 on the two sides to be parallel and level with the edge of the bottom wall plate 3, adjusting the smoothness, and tightly attaching the plate surfaces of the wall plates on the two sides to the side edge of the process partition plate, thereby completing the positioning and bending of the wall plates 2 on the two sides. And finally, assembling the top wall plate 1 on the tops of the wall plates 2 on the two sides, keeping the edges parallel and level with each other, and respectively welding and forming the bottom wall plate 3, the rectangular process partition plate 4, the wall plates 2 on the two sides and the top wall plate 1 to finish the manufacture of the bent square pipe.
Further, in the process of blanking each wallboard, because the design of three-dimensional design software, each wallboard itself has the bending in width direction, so need to be located the tip of same one side with bottom wallboard 3, wallboard 2 and the top wallboard 1 on both sides limit when the assembly and mark to confirm the crooked direction of crooked square pipe, thereby need not to distinguish through the measurement size, further improvement crooked square pipe assembly's efficiency. Each wallboard obtained after blanking is assembled on the supporting jig frame 7 to obtain a bent square pipe, and the method further comprises the following steps: the bent square tube assembled and molded on the support jig 7 is subjected to molding dimension measurement and inspection, and the detection process comprises the following steps:
acquiring the vertical height from the top of the two side wall plates of the bent square tube assembled on the support jig 7 to the reference line 6 and the relative distance between the two end parts of the top wall plate 1 and the bottom wall plate 3 of the bent square tube which are positioned on the same side;
and respectively comparing the acquired vertical height and the acquired relative distance with the design requirement size in the three-dimensional design software, and finishing welding if the design requirement is met.
After the bent square tube is installed on the supporting jig frame 7, the detection size on the supporting jig frame 7 can be measured, after the wallboards 2 on the two sides are installed, because the bottom wallboard 3 has inclination, the height difference also exists between the wallboards 2 on the two sides vertically installed on the bottom wallboard 3, and then the inclination exists on the two sides of the top wallboard 1, the vertical height of the top of the wallboard 2 on the two sides from the datum line 6 is measured in six cross sections respectively, and the height value Q is obtained5And Q7、R5And R7、S5And S7、T5And T7、U5And U7、W5And W7Then the relative distance between the end portions of the top wall 1 and the bottom wall 3 on the same side is measured to obtain a relative distance value Q6、R6、S6、T6、U6、W6And comparing the detected data with the design requirement size in the three-dimensional design software, and finishing welding if the data meet the requirement of the design size to obtain the bent square tube. In the embodiment, the wall plates obtained by blanking are all steel plates,and the ratio of the thickness delta of each wall plate to the external dimension B of the cross section is less than 0.05, wherein delta is less than or equal to 14mm, and the designed bending radius of the formed bent square tube in the height direction and the width direction is more than 10 times larger than the dimension of the rectangular cross section of the bent square tube, so that on the basis of ensuring the structural strength of the bent square tube, the bending of each wall plate in the assembling process is facilitated, and the quality of the bent square tube is ensured.
The manufacturing method of the bent square tube comprises the steps of firstly obtaining a three-dimensional model formed by the bent square tube through three-dimensional design software, accurately unfolding four wall plates of the bent square tube according to the shape and size, lofting the four wall plates in the three-dimensional design software, and cutting and blanking the four wall plates in a numerical control cutting mode, wherein the bending modulus of each wall plate in the width direction is the strong axis direction of the wall plate, and the bending radian is designed, lofted, unfolded, blanked and cut to be directly formed without machining and bending forming by mechanical equipment. The size structure of the support jig frame 7 is obtained according to the matching of the bent square tube in the three-dimensional model and the support jig frame 7 to manufacture, four well-blanked wall plates are assembled on the manufactured support jig frame 7 respectively, the four wall plates can be bent in place by means of the rigidity of the jig frame and a simple assembly tool, the bending modulus of the wall plates in the thickness direction is the weak axis direction of the wall plates, the thickness of each wall plate is far smaller than the length, the wall plates are arranged independently, and the deformation of the wall plates on the support jig frame is very easy under the condition that the wall plates are not rigidly fixed with each other. The process of positioning and assembling each wall plate of the bent square tube by adopting the supporting jig frame 7 is very convenient, the quality is higher, and the quality detection in the later period can be favorably carried out. Compared with the conventional process, the manufacturing method of the whole bent square tube has the advantages that cold bending processing equipment is not needed, the manufacturing can be completed through water-fire bending, the manufacturing process is very simple, the investment equipment and the auxiliary forming tool are greatly reduced, the production cost can be reduced, the manufacturing method is convenient to use in large-scale production and processing, the processing efficiency is favorably improved, and the economic benefit is increased.
It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
The foregoing is directed to the preferred embodiment of the present invention, and it is understood that various changes and modifications may be made by one skilled in the art without departing from the spirit of the invention, and it is intended that such changes and modifications be considered as within the scope of the invention.
Claims (6)
1. The manufacturing method of the bent square tube is characterized by comprising the following steps of:
completing a three-dimensional model of the bent square tube through three-dimensional design software;
designing a support jig frame corresponding to the bending shape of a bottom wall plate of the three-dimensional model of the bent square tube at the bottom of the three-dimensional model, and determining the size structure for manufacturing the support jig frame;
obtaining a lofting expansion diagram of each wall plate of the three-dimensional model of the bent square tube, and respectively cutting and blanking each wall plate;
assembling each wall plate obtained after blanking on a supporting jig frame to obtain a bent square tube, wherein the ratio of the thickness delta of each wall plate obtained after blanking to the external dimension B of the cross section is less than 0.05, and delta is less than or equal to 14 mm;
the step of determining the dimensional structure of the support jig particularly comprises:
selecting a plurality of sections of a bent square tube arranged on a support jig frame at certain intervals in three-dimensional design software, and taking the interval between the sections as the space size of an upright post of the support jig frame;
acquiring the height of each of two sides of the bottom wall plate of the bent square tube on each section from the ground, taking the height as the height of the upright columns on two sides of the supporting jig frame, and determining the inclination of the jig frame surface;
the step of assembling each wall plate obtained after blanking on a supporting jig frame to obtain a bent square tube specifically comprises:
determining the placing direction of the bent square tube through three-dimensional design software, and acquiring coordinate values of a selected position of a bottom wall plate of the bent square tube so as to mark on a support jig;
positioning and mounting the blanked bottom wall plate according to the mark so as to ensure the bending degree of the bottom wall plate in the width and thickness bending directions;
assembling the two blanked side wall plates on the bottom wall plate respectively, and positioning and mounting the top wall plate to form a bent square pipe;
the method specifically comprises the following steps of determining the placing direction of the bent square tube through three-dimensional design software, and acquiring coordinate values of the selected positions of the bottom wall plate of the bent square tube so as to mark on the support jig:
selecting the head end and the tail end of the bottom wall plate of the bent square tube as datum points through three-dimensional design software, and taking a connecting line between the head end datum points and the tail end datum points as datum lines;
acquiring the height of the datum line in each section from the ground;
acquiring the distance between the two sides of the bottom wall plate on each section and the datum line;
the positions of both sides of the bottom wall plate are identified at each cross-sectional position on the jig frame surface.
2. The method of manufacturing a bent square pipe according to claim 1,
after the step of completing the three-dimensional model of the bent square tube by the three-dimensional design software, the method further comprises the following steps of: and designing a plurality of rectangular process partition plates which are arranged at intervals in the three-dimensional model of the bent square tube, wherein the rectangular process partition plates are vertical to the side surfaces of the wall plates.
3. The method for manufacturing a bent square pipe according to claim 2, wherein the steps of assembling the two blanked side wall plates on the bottom wall plate, and positioning and installing the top wall plate to form the bent square pipe specifically comprise:
preparing blanking of the rectangular process partition plate according to the size of the rectangular process partition plate in the three-dimensional design software;
vertically mounting the blanked rectangular process partition plates on the bottom wall plate according to the intervals in the three-dimensional model;
assembling the wall plates on two sides, so that the wall plates on two sides are respectively perpendicular to the side lines of the bottom wall plate, and the bending directions of the side lines of the wall plates on two sides are flush with the side lines of the bottom wall plate;
the plate surfaces of the wall plates on the two sides are fixedly attached to the side edges of the rectangular process partition plate;
and assembling top wall plates on the tops of the wall plates on the two sides and welding and forming.
4. The method of manufacturing a bent square pipe according to claim 3, further comprising, before assembling the bottom wall plate, the wall plates on both sides, and the top wall plate of the bent square pipe on the support jig:
in the blanking process, the end parts of the bottom wall plate, the wall plates on two sides and the top wall plate which need to be positioned on the same side during assembly are marked so as to determine the bending direction of the bent square pipe.
5. The method for manufacturing a bent square pipe according to claim 1, wherein the step of assembling each panel obtained after blanking on a support jig to obtain a bent square pipe further comprises:
and measuring and checking the forming size of the bent square tube assembled and formed on the support jig.
6. The method for manufacturing a bent square pipe according to claim 5, wherein the step of measuring and inspecting the forming dimension of the bent square pipe assembled and formed on the support jig specifically comprises:
acquiring the vertical height between the tops of wall plates on two sides of a bent square tube assembled on a support jig and the reference line, and the relative distance between two end parts of the top wall plate and the bottom wall plate of the bent square tube, which are positioned on the same side;
and respectively comparing the acquired vertical height and the acquired relative distance with the design requirement size in the three-dimensional design software, and finishing welding if the design requirement is met.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910639709.9A CN110524190B (en) | 2019-07-15 | 2019-07-15 | Manufacturing method of bent square and rectangular tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910639709.9A CN110524190B (en) | 2019-07-15 | 2019-07-15 | Manufacturing method of bent square and rectangular tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110524190A CN110524190A (en) | 2019-12-03 |
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| CN112173343B (en) * | 2020-09-24 | 2022-04-22 | 中国核动力研究设计院 | Welding method for square tube of spent fuel storage grillwork |
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