CN110871219A - Cold roll forming process of high-strength steel square rectangular pipe - Google Patents
Cold roll forming process of high-strength steel square rectangular pipe Download PDFInfo
- Publication number
- CN110871219A CN110871219A CN201811025379.6A CN201811025379A CN110871219A CN 110871219 A CN110871219 A CN 110871219A CN 201811025379 A CN201811025379 A CN 201811025379A CN 110871219 A CN110871219 A CN 110871219A
- Authority
- CN
- China
- Prior art keywords
- section
- bending
- strength steel
- roller
- square rectangular
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
- B21C37/0803—Making tubes with welded or soldered seams the tubes having a special shape, e.g. polygonal tubes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention relates to a cold roll forming process of a high-strength square rectangular steel tube, which is used for processing a high-strength steel plate belt into the high-strength square rectangular steel tube, dividing the high-strength steel plate belt into a left upper section, a left side section, a lower section, a right side section and a right upper section along the width direction of the high-strength steel plate belt according to the side length of the square rectangular steel tube, and sequentially carrying out the following steps: bending the left upper section and the right upper section to a specified angle; bending the left side section and the right side section to a specified angle; simultaneously bending the left upper section, the left side section, the lower section, the right side section and the right upper section to a specified angle; welding the left upper section and the right upper section, and bending the left upper section and the right upper section simultaneously to ensure that the left upper section and the right upper section are in an aligned state; and shaping the semi-formed high-strength steel square rectangular pipe. The cold roll forming process is simple to operate, ensures the forming quality of the high-strength steel square rectangular pipe, and improves the qualification rate of products.
Description
Technical Field
The invention relates to the field of steel pipe forming, in particular to a cold roll forming process of a high-strength steel square rectangular pipe.
Background
High-strength steel square and rectangular tube products are often applied to the automobile industry. With energy crisis and environmental issues, energy conservation and emission reduction have become the most important starting points for the automobile manufacturing industry. The application of the high-strength steel product has the most obvious effect of reducing the automobile body, and can reduce the oil consumption of automobiles and reduce the emission. The existing cold roll forming mode of the high-strength steel square rectangular pipe is basically the same as that of a square rectangular pipe made of common materials, and a direct forming mode is adopted. However, for high-strength steel, such as high-strength steel with yield strength of 700MPa or more, the high-strength steel is not easy to reduce and extend, and compared with the conventional material, the qualified product cannot be obtained by adopting the forming process of the common square and rectangular pipe.
Disclosure of Invention
In view of the above drawbacks of the prior art, the present invention provides a cold roll forming process for a high-strength square rectangular steel tube, so as to improve the forming quality of the high-strength square rectangular steel tube.
In order to achieve the purpose, the invention provides a cold roll forming process of a high-strength square rectangular steel tube, which is used for processing a high-strength steel plate strip into the high-strength square rectangular steel tube, and the cold roll forming process sequentially comprises the following steps:
s1, dividing the high-strength steel plate strip into a left upper section, a left side section, a lower section, a right side section and a right upper section along the width direction of the high-strength steel plate strip according to the side length of the high-strength square steel rectangular pipe; the left upper section, the left side section, the lower section, the right side section and the right upper section are respectively formed into an upper left half section part, a left side part, a lower side part, a right side part and an upper right half section part of the high-strength square rectangular steel tube after the high-strength square rectangular steel tube is formed;
s2, bending and deforming the upper left section relative to the left section, wherein an inner included angle a between the upper left section and the left section is 95-105 degrees after bending is completed, and a bent part A is formed at the joint of the upper left section and the left section; bending and deforming the right upper section relative to the right section, wherein an internal included angle D between the right upper section and the right section is 95-105 degrees after bending is finished, a bent angle part D is formed at the joint of the right upper section and the right section, and the bending directions of the left upper section and the right upper section are the same;
s3, bending and deforming the left section relative to the lower section, wherein an inner included angle B between the left section and the lower section is 90-98 degrees after bending is completed, and a bent part B is formed at the joint of the left section and the lower section; bending and deforming the right section relative to the lower section, wherein an inner included angle C between the right section and the lower section is 90-98 degrees after the bending and deformation are finished, and a corner part C is formed at the joint of the right section and the lower section; the bending directions of the left side section and the right side section are the same;
s4, bending and deforming the bent angle part A, the bent angle part B, the bent angle part C and the bent angle part D, wherein after bending is completed, the end head of the left upper edge section is abutted with the end head of the right upper edge section, a welding gap is formed between the end head of the left upper edge section and the end head of the right upper edge section, and the inner included angle B and the inner included angle C are 90-95 degrees;
s5, welding the welding gap, and bending the corner part A and the corner part D simultaneously, wherein the end of the upper left section is opposite to the end of the upper right section; after welding is finished, the inner included angle a and the inner included angle d are 90-98 degrees, and the left upper edge section and the right upper edge section are connected into a whole to obtain a semi-finished high-strength steel square rectangular pipe;
and S6, shaping and deforming the semi-finished high-strength steel square rectangular tube to obtain the finished high-strength steel square rectangular tube.
Further, in the step S2, the bending deformation of the upper left edge section relative to the upper left edge section and the bending deformation of the upper right edge section relative to the upper right edge section are performed simultaneously, and the bending deformation processes are performed in a plurality of deformation passes, and the sizes of the inner included angle a and the inner included angle d are sequentially decreased as the bending deformation passes gradually increase.
Further, in the step S2, the bending deformation of the upper left section with respect to the upper left section and the bending deformation of the upper right section with respect to the upper right section are both performed by the upper roller and the lower roller.
Further, in the step S3, the bending deformation of the left section with respect to the lower section and the bending deformation of the right section with respect to the lower section are performed simultaneously, and the bending deformation process is performed by dividing into a plurality of deformation passes, and the sizes of the inner included angle b and the inner included angle c are sequentially decreased as the bending deformation passes gradually increase.
Further, in the step S3, the bending deformation of the left section with respect to the lower section and the bending deformation of the right section with respect to the lower section are all performed by the upper roller and the lower roller, or all performed by the upper roller, the lower roller, the left roller and the right roller.
Further, the step S4 includes the following steps: and simultaneously, the lower roller is used for extruding the lower edge section, the upper roller is used for extruding the left upper edge section and the right upper edge section, the left roller is used for extruding the left edge section, and the right roller is used for extruding the right edge section, so that the bending deformation is simultaneously carried out on the bent angle part A, the bent angle part B, the bent angle part C and the bent angle part D.
Preferably, the upper roller is of an integrated structure and is provided with a groove, and after bending deformation is completed, the groove is aligned with the welding gap.
Preferably, the left side roller and the right side roller are provided with corner protection structures for protecting the corner part A and the corner part D.
Preferably, in the step S5, high frequency welding is adopted at the welding gap, and the welding is performed while cleaning up the welding slag adhered in the groove of the upper roller by using a slag removing device.
Further, in step S6, six-pass plastic deformation is performed, and convex rollers are used in two passes.
As mentioned above, the cold roll forming process of the high-strength square rectangular steel pipe has the following beneficial effects:
through the internal included angle between the upper left side section and the left side section after the control is buckled, between the upper right side section and the right side section, between the left side section and the lower side section, and between the right side section and the lower side section, the angle that the high-strength steel plate belt actually obtained after the bending deformation that leads to because the high rebound volume of intensity is big is prevented from not complying with the processing requirement, has guaranteed the shaping quality of buckling. And when welding upper left side section end and upper right side section end, the bight A of bending and bent portion D guarantee that upper left side section end and upper right side section end are aligned, have improved welding quality, have guaranteed the roughness on the high-strength shaped steel square rectangular pipe. The cold roll forming process is simple to operate, ensures the forming quality of the high-strength steel square rectangular pipe, and improves the qualification rate of products.
Drawings
FIG. 1 is a schematic structural view of a section of a high-strength steel square rectangular pipe formed according to the present invention.
Fig. 2 is a schematic structural view illustrating a flattened state of a high-strength steel plate strip forming the high-strength square rectangular steel pipe of fig. 1.
FIG. 3 is a roller flower diagram of the forming process of the high-strength steel square rectangular pipe in the invention.
Fig. 4 is a schematic view of the bending process of the upper left section and the upper right section in the present invention.
Fig. 5 is a schematic view of the bending process of the left and right sections of the present invention.
FIG. 6 is a schematic view of the present invention showing the process of bending the left and right segments using rollers.
FIG. 7 is a schematic view of the present invention showing the left, right, left upper and right upper sections being bent by a roll.
Fig. 8 is a schematic view of the extrusion welding process of the present invention.
FIG. 9 is a schematic axial view of the extrusion welding process of the present invention.
FIG. 10 is a schematic view of the shaping process of the high-strength steel square rectangular pipe according to the present invention.
Description of the element reference numerals
1 upper left segment
2 left side segment
3 lower section
4 right side segment
5 upper right segment
6 weld gap
7 upper roll
71 groove
8 left side roll
9 lower roll
10 right side roll
11 remove welding slag device
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, but rather by the claims. In addition, the terms such as "upper", "lower", "left", "right" and "middle" used in the present specification are for convenience of description only, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be regarded as the scope of the present invention without substantial changes in the technical contents.
The invention provides a cold-bending forming process of a high-strength steel square rectangular pipe, which is used for processing a high-strength steel plate strip into the high-strength steel square rectangular pipe, and as shown in reference to figures 1 to 3, the cold-bending forming process sequentially comprises the following steps:
s1, referring to fig. 1 and 2, dividing the high-strength steel strip into a left upper section 1, a left section 2, a lower section 3, a right section 4 and a right upper section 5 along the width direction of the high-strength steel strip according to the length of the high-strength steel square rectangular tube; the left upper section 1, the left section 2, the lower section 3, the right section 4 and the right upper section 5 respectively form an upper left half section part, a left side part, a lower side part, a right side part and an upper right half section part of the high-strength square rectangular pipe after the high-strength square rectangular pipe is formed. Wherein the section shown in fig. 1 is a pipe section of the formed high-strength square rectangular steel pipe, and fig. 2 is a structural schematic view of the high-strength steel plate strip constituting the high-strength square rectangular steel pipe in fig. 1 in a flattened state. Before processing, according to the side length of the high-strength square steel rectangular pipe, the high-strength steel plate strip is divided into sections artificially, preferably, the lengths of the left section 2, the lower section 3 and the right section 4 are equal, the lengths of the left upper section 1 and the right upper section 5 are 1/2 of the length of the left section 2 plus the length of welding allowance, and preferably, the length of the welding allowance is half of the thickness of the high-strength steel plate strip.
S2, referring to fig. 4, bending and deforming the left upper section 1 relative to the left section 2, wherein an inner included angle a between the left upper section 1 and the left section 2 is 95-105 degrees after bending is completed, and a bent part A is formed at the joint of the left upper section 1 and the left section 2; bending and deforming the right upper section 5 relative to the right section 4, wherein an inner included angle D between the right upper section 5 and the right section 4 is 95-105 degrees after bending is finished, a connecting part of the right upper section 5 and the right section 4 forms a bent angle part D, and the bending directions of the left upper section 1 and the right upper section 5 are the same. Preferably, the inner included angle a and the inner included angle d are both 100 ° after the bending deformation is completed. Due to the high strength of the high-strength steel, the inner radius R1 of the corner part A and the inner radius R4 of the corner part D are guaranteed to be larger than the inner radius R of four corner parts of the formed high-strength steel square rectangular pipe in the bending deformation process, and preferably, the values of R1 and R4 are 1.5R-2R, so that the corner parts are prevented from cracking when being too small. The rest of the left 1 and right 5 upper sections, except for the corners, remains straight during bending.
S3, referring to fig. 5, bending and deforming the left section 2 relative to the lower section 3, wherein an inner included angle B between the left section 2 and the lower section 3 is 90-98 degrees after bending is completed, and a bent part B is formed at the joint of the left section 2 and the lower section 3; bending and deforming the right section 4 relative to the lower section 3, wherein an inner included angle C between the right section 4 and the lower section 3 is 90-98 degrees after the bending and deformation are finished, and a corner part C is formed at the joint of the right section 4 and the lower section 3; the bending directions of the left side section 2 and the right side section 4 are the same. Preferably, the internal included angle b and the internal included angle c are both 94 ° after the bending deformation is completed. Preferably, during the bending process, the inner radius R2 of the corner part B and the inner radius R3 of the corner part C ensure the inner radius R of four corner parts of the molded high-strength square rectangular steel tube, and preferably, the values of R2 and R3 are 1.5R-2R, so that the cracking caused by too small corner parts is prevented. The remaining parts of the left-hand and right- hand segments 2, 4, except for the corners, should remain as straight as possible during bending.
S4, referring to fig. 8, bending the corner portion a, the corner portion B, the corner portion C, and the corner portion D, and after bending, the end of the left upper segment 1 and the end of the right upper segment 5 abut against each other, and a welding gap 6 is formed therebetween, and the inner included angle B and the inner included angle C are 90 ° -95 °, and preferably 94 °. Preferably, the remaining parts of the left upper section 1, the left section 2, the lower section 3, the right section 4 and the right upper section 5, except for the corners, should remain as straight as possible during bending.
S5, welding the welding gap 6, and bending the corner part A and the corner part D simultaneously, wherein the end of the left upper section 1 is opposite to the end of the right upper section 5; after welding, the inner included angle a and the inner included angle d are 90-98 degrees, and the left upper section 1 and the right upper section 5 are connected into a whole to obtain a semi-finished high-strength steel square rectangular pipe; in the welding process, the equal-height alignment of the end of the upper left edge section 1 and the end of the upper right edge section 5 is ensured to prevent welding misalignment and uneven welding seam surfaces, so that the welding quality and the flatness of the upper edge part of the formed high-strength steel square rectangular pipe are ensured.
And S6, shaping and deforming the semi-finished high-strength steel square rectangular tube to obtain the finished high-strength steel square rectangular tube. The shaping content comprises the planeness of the four side surfaces of the high-strength steel square rectangular pipe and four corner parts.
Due to the strength of the high-strength steel plate belt, the rebound quantity after bending deformation is large, the quality of the bending deformation is difficult to ensure by adopting a common forming process, and a qualified product cannot be obtained. By adopting the cold-bending forming process, in the bending forming process of the high-strength steel square rectangular tube, the sizes of the inner included angles between the left upper section 1 and the left section 2, between the right upper section 5 and the right section 4, between the left section 2 and the lower section 3 and between the right section 4 and the lower section 3 after bending are strictly controlled, and the condition that the inner angles between the actually obtained edge sections of the high-strength steel plate strip after bending deformation do not meet the requirements due to large rebound quantity is avoided, so that the bending forming quality is ensured. And when welding 1 end of the upper left section and 5 ends of the upper right section, bending the bend part A and the bend part D to ensure that the 1 end of the upper left section and the 5 ends of the upper right section are aligned, so that the welding quality is improved, and the flatness of the upper part of the high-strength steel square rectangular pipe is ensured. The cold roll forming process is simple to operate, ensures the forming quality of the high-strength steel square rectangular pipe, and improves the qualification rate of products
In step S2, as a preferable design, referring to fig. 4, the bending deformation of the left upper section 1 relative to the left section 2 and the bending deformation of the right upper section 5 relative to the right section 4 are performed simultaneously, and the bending deformation process is performed in a plurality of deformation passes, and the sizes of the inner included angle a and the inner included angle d are sequentially decreased as the bending deformation passes gradually increase, which is a first deformation step. In the first deformation stage, the total rebound amount of bending deformation can be reduced through multiple deformation passes, the bending forming quality is ensured, and meanwhile, the high-strength steel raw material is prevented from cracking in the bending deformation process. The number of deformation passes can be confirmed according to actual conditions, and preferably, in the embodiment, four deformation passes are adopted, and the internal included angle a and the internal included angle d are changed according to the angle ranging from 160 degrees to 140 degrees to 120 degrees to 100 degrees to complete four deformation passes. Preferably, the bending deformation at the corner part a and the corner part D adopts a solid bending mode, so that the quality of the bending deformation is ensured. As a preferred design, the bending deformation of the upper left edge segment 1 relative to the left edge segment 2 and the bending deformation of the upper right edge segment 5 relative to the right edge segment 4 are both performed by the upper roller 7 and the lower roller 9, and specifically, refer to the working schematic of the left edge segment 2 and the lower edge segment 3 using the upper roller 7 and the lower roller 9 in fig. 6, and the working principle of the bending deformation of the two is the same. Wherein the lower roller 9 is a combined roller, and the upper end of the lower roller 9 is provided with an inverted trapezoidal space. Arranging the high-strength steel plate strip in the inverted trapezoidal space of the lower roller 9, pressing the lower end of the upper roller 7 against the upper side face of the high-strength steel plate strip and extruding the lower end of the high-strength steel plate strip, so that the slopes on two sides of the inverted trapezoidal space of the lower roller 9 extrude the upper left edge section 1 and the upper right edge section 5, the bent angle part A and the bent angle part D are formed on two edges of the upper roller 7, and the bent deformation of the bent angle part A and the bent angle part D is real bending. And when the lower section 3 of the high-strength steel plate strip is extruded to the bottom of the inverted trapezoidal space, the bending deformation process is finished. The sizes of the inner radius R1 of the corner portion a and the inner radius R4 of the corner portion D at the time of bending can be adjusted by adjusting the sizes of the arcs of both edges of the lower end of the upper roll 7.
In step S3, as a preferable design, referring to fig. 5, the bending deformation of the left side section 2 relative to the lower side section 3 and the bending deformation of the right side section 4 relative to the lower side section 3 are performed simultaneously, and the bending deformation process is performed in a plurality of deformation passes, and the sizes of the inner included angle b and the inner included angle c are sequentially reduced as the bending deformation passes gradually increase, which is a second deformation stage. In the second deformation stage, the total rebound amount of bending deformation is reduced through multiple deformation passes, the bending forming quality is ensured, and meanwhile, the high-strength steel raw material is prevented from cracking in the bending deformation process. The number of deformation passes can be determined according to actual conditions, preferably nine deformation passes are adopted in the embodiment, and after the fifth deformation pass, the internal included angles b and c are 110-120 degrees, and preferably 115 degrees. Preferably, the bending deformation at the corner part B and the corner part C adopts a solid bending mode, so that the quality of the bending deformation is ensured. As a preferred design, referring to fig. 6, the first five deformation passes are completed by the upper roller 7 and the lower roller 9, and the specific bending deformation process is the same as the working principle of the extrusion bending of the upper left edge segment 1 and the upper right edge segment 5 by the upper roller 7 and the lower roller 9, which will not be described again here. The sizes of the inner radius R2 of the bend part B and the inner radius R3 of the bend part C in the bending process can be adjusted by adjusting the sizes of the radians of the two edges of the lower end of the upper roller 7. In the bending deformation process, the left upper edge section 1 and the right upper edge section 5 gradually draw close to the middle position, and the inner included angle b and the inner included angle c gradually decrease. After the fifth deformation pass, the end of the upper left section 1 is close to the right above the corner B and close to the upper roll 7, and the end of the upper right section 5 is close to the right above the corner C and close to the upper roll 7. At this time, the form of the rolls is changed, as shown in fig. 7, the deformation passes after the fifth time are completed by the upper roll 7, the lower roll 9, the left side roll 8 and the right side roll 10 together, the upper roll 7 abuts against the upper sides of the left upper section 1 and the right upper section 5 at the same time, the lower roll 9 abuts against the lower side of the lower section 3, the left side roll 8 presses the left side of the left section 2 to bend and deform the lower section 3, the right side roll 10 presses the right side of the right section 4 to bend and deform the lower section 3, the inner included angle b and the inner included angle c are gradually reduced, and after the ninth deformation pass is completed, the angle b and the inner included angle c are 90 degrees to 98 degrees, and 94 degrees is preferable. In this embodiment, preferably, the internal included angle b and the internal included angle c are decreased in the range of 177 to 154 to 141 to 128 to 115 to 108 to 102 to 98 to 94 to perform nine deformation passes. When the left side roller 8 and the right side roller 10 respectively extrude the left side section 2 and the right side section 4, the upper roller 7 can only abut against the left upper side section 1 and the right upper side section 5, and can also simultaneously extrude the left upper side section 1 and the right upper side section 5, so that the bent angle part A and the bent angle part D are properly bent and deformed, and preferably, after the bending is finished, the inner included angle a and the inner included angle D are 94 degrees.
In step S4, as a preferable design, referring to fig. 8, in the present embodiment, the lower roll 9 is used to press the lower section 3, the upper roll 7 is used to press the upper left section 1 and the upper right section 5, the left roll 8 is used to press the left section 2, and the right roll 10 is used to press the right section 4, and the corner portion a, the corner portion B, the corner portion C, and the corner portion D are simultaneously bent and deformed, which is the third deformation stage. In the third deformation stage, a mode of simultaneous extrusion is adopted, four bending angles are bent and deformed simultaneously, the bending deformation is more uniform, and the bending forming quality is favorably improved. As a preferable design, as shown in fig. 8, the upper roller 7 is of an integral structure, and the upper roller 7 is provided with a groove 71, and after the bending deformation is completed, the groove 71 is aligned with the welding gap 6. Adopt the top roll 7 of integral type, can guarantee that upper left edge section 1 and upper right edge section 5 keep highly the same at extrusion process to welding misalignment and 6 levels of weld gap are uneven appear when preventing follow-up welding. The groove 71 is used to keep the upper roll 7 from the welding gap 6, thereby ensuring smooth welding.
In step S5, as a preferable design, in this embodiment, referring to fig. 9, the welding between the upper left section 1 and the upper right section 5 is performed by high frequency welding, and the welding slag adhering to the groove 71 of the upper roller 7 is cleaned by the slag removing device 11 while welding, and the extrusion welding process is a fourth stage of deformation. Preferably, the slag removing device 11 in this embodiment is a white steel knife, and the front end of the white steel knife extends into the groove 71. During high-frequency welding, the end of the left upper section 1 and the end of the right upper section 5 are heated to a molten state through a high-frequency current skin effect and a proximity effect, and redundant metal oxides and the like in the welding gap 6 are extruded through extrusion of the left side roller 8 and the right side roller 10 to form an inner welding rib and an outer welding rib. During this welding process, the substance just extruded from the welding gap 6 is in a molten state and tends to stick in the groove 71 of the extrusion upper roll 7. Preferably. The front end of the white steel knife is slender, the width of the white steel knife is about 1mm narrower than the width of the groove 71, the front end of the white steel knife is inserted into the groove 71, adhesion in the groove 71 can be effectively removed, the adhesion at the position of the groove 71 is prevented from hardening after being cooled, and indentation is formed on the surface of a product along with the rotation of the upper roller 7, so that the problem of welding quality is avoided. As the preferred design, the left side roller 8 and the right side roller 10 are also provided with corner angle protection structures, when the left side section 2 and the right side section 4 are extruded, the corner angle protection structures protect a corner angle part A and a corner angle part D, so that in the extrusion welding process, the inner radius R1 of the corner angle part A and the inner radius R4 of the corner angle part B cannot be reduced due to the extrusion forces of the upper roller 7, the left side roller 8 and the right side roller 10, meanwhile, the extrusion forces of the left side roller 8 and the right side roller 10 can be guaranteed to be well transmitted to the welding gap 6 through the upper left side section 1 and the upper right side section 5, and the welding quality and the welding strength are guaranteed.
In step S6, as an optimized design, as shown in fig. 10, six-pass shaping deformation is performed in the shaping process, and two passes of the shaping deformation are performed by using convex rollers, and the shaping deformation is a fifth deformation stage. In the fifth deformation stage, the poor shaping effect of the high-strength steel plate belt due to the large deformation rebound amount is prevented by the integral deformation. Meanwhile, because the high-strength steel plate has high strength and large rebound quantity, the peripheral surfaces of the semi-finished high-strength steel square rectangular tube are easy to become drum-shaped, convex rollers are adopted for shaping in two passes, and the upper roller 7, the left roller 8, the lower roller 9 and the right roller 10 are all in the form of convex rollers, so that the four side surfaces of the semi-finished high-strength steel square rectangular tube are shaped to ensure the flatness of the four side surfaces.
The invention relates to a cold roll forming process of a high-strength steel square rectangular pipe, which is a new forming process and is suitable for processing and forming high-strength steel, in particular to high-strength steel with the yield strength of more than or equal to 700 MPa. In the invention, the cold-bending forming process adopts a multi-deformation-pass bending forming mode, and as shown in figure 3,
the high-strength steel plate strip is processed into the high-strength square steel rectangular pipe by the aid of the rollers, the problem that the high-strength steel plate strip is large in rebound quantity is solved, forming quality of the high-strength square steel rectangular pipe is guaranteed, and product yield is improved. In conclusion, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a cold roll forming process of high-strength steel square rectangular pipe for with high-strength steel plate area processing become high-strength steel square rectangular pipe, its characterized in that: the cold roll forming process sequentially comprises the following steps:
s1, dividing the high-strength steel plate strip into a left upper section (1), a left section (2), a lower section (3), a right section (4) and a right upper section (5) along the width direction of the high-strength steel plate strip according to the side length of the high-strength square steel rectangular pipe; the left upper section (1), the left section (2), the lower section (3), the right section (4) and the right upper section (5) form an upper left half section part, a left side part, a lower side part, a right side part and an upper right half section part of the high-strength square rectangular steel tube respectively after the high-strength square rectangular steel tube is formed;
s2, bending and deforming the left upper section (1) relative to the left section (2), wherein an internal included angle a between the left upper section (1) and the left section (2) is 95-105 degrees after bending is finished, and a bent part A is formed at the joint of the left upper section and the left section; bending and deforming the right upper section (5) relative to the right section (4), wherein an inner included angle D between the right upper section (5) and the right section (4) is 95-105 degrees after bending is finished, a bent angle part D is formed at the joint of the right upper section and the right section, and the bending directions of the left upper section (1) and the right upper section (5) are the same;
s3, bending and deforming the left section (2) relative to the lower section (3), wherein an inner included angle B between the left section (2) and the lower section (3) is 90-98 degrees after bending is completed, and a bent angle part B is formed at the joint of the left section and the lower section; bending and deforming the right section (4) relative to the lower section (3), wherein an inner included angle C between the right section (4) and the lower section (3) is 90-98 degrees after the bending and deformation are finished, and a corner part C is formed at the joint of the right section and the lower section; the bending directions of the left side section (2) and the right side section (4) are the same;
s4, bending and deforming the bent angle part A, the bent angle part B, the bent angle part C and the bent angle part D, wherein after bending is finished, the end head of the left upper edge section (1) is abutted with the end head of the right upper edge section (5), a welding gap (6) is formed between the end head of the left upper edge section and the end head of the right upper edge section, and the inner included angle B and the inner included angle C are 90-95 degrees;
s5, welding the welding gap (6), bending the corner part A and the corner part D simultaneously, and enabling the end of the left upper section (1) to be opposite to the end of the right upper section (5); after welding is finished, the inner included angle a and the inner included angle d are 90-98 degrees, the left upper edge section (1) and the right upper edge section (5) are connected into a whole, and a semi-finished high-strength steel square rectangular pipe is obtained;
and S6, shaping and deforming the semi-finished high-strength steel square rectangular tube to obtain the finished high-strength steel square rectangular tube.
2. The cold roll forming process of the high-strength steel square rectangular pipe according to claim 1, characterized in that: in the step S2, the bending deformation of the left upper section (1) relative to the left section (2) and the bending deformation of the right upper section (5) relative to the right section (4) are performed simultaneously, and the bending deformation process is performed in a plurality of deformation passes, and the sizes of the inner included angle a and the inner included angle d are sequentially reduced along with the gradual increase of the deformation passes.
3. The cold roll forming process of the high-strength steel square rectangular pipe according to claim 1, characterized in that: in the step S2, bending deformation of the left upper section (1) relative to the left section (2) and bending deformation of the right upper section (5) relative to the right section (4) are completed by an upper roller (7) and a lower roller (9) together.
4. The cold roll forming process of the high-strength steel square rectangular pipe according to claim 1, characterized in that: in the step S3, the bending deformation of the left side section (2) relative to the lower side section (3) and the bending deformation of the right side section (4) relative to the lower side section (3) are performed simultaneously, the bending deformation process is performed by dividing into a plurality of deformation passes, and the sizes of the inner included angle b and the inner included angle c are sequentially reduced along with the gradual increase of the deformation passes.
5. The cold roll forming process of the high-strength steel square rectangular pipe according to claim 1, characterized in that: in the step S3, the bending deformation of the left side segment (2) relative to the lower side segment (3) and the bending deformation of the right side segment (4) relative to the lower side segment (3) are both completed by the upper roller (7) and the lower roller (9), or are all completed by the upper roller (7), the lower roller (9), the left side roller (8) and the right side roller (10) together.
6. The cold roll forming process of the high-strength steel square rectangular pipe according to claim 1, characterized in that: the step S4 includes the steps of: meanwhile, a lower roller (9) is used for extruding a lower edge section (3), an upper roller (7) is used for extruding a left upper edge section (1) and a right upper edge section (5), a left roller (8) is used for extruding a left edge section (2), and a right roller (10) is used for extruding a right edge section (4), so that bending deformation is simultaneously carried out on a bent angle part A, a bent angle part B, a bent angle part C and a bent angle part D.
7. The cold roll forming process of the high-strength steel square rectangular pipe according to claim 6, characterized in that: the upper roller (7) is of an integrated structure, the upper roller (7) is provided with a groove (71), and after bending deformation is completed, the groove (71) is aligned with the welding gap (6).
8. The cold roll forming process of the high-strength steel square rectangular pipe according to claim 6, characterized in that: and the left side roller (8) and the right side roller (10) are provided with bent angle protection structures for protecting a bent angle part A and a bent angle part D.
9. The cold roll forming process of the high-strength steel square rectangular pipe according to claim 7, characterized in that: in the step S5, high-frequency welding is adopted at the welding gap (6), and welding slag adhered in the groove (71) of the upper roller (7) is cleaned by a slag removing device (11) while welding.
10. The cold roll forming process of the high-strength steel square rectangular pipe according to claim 1, characterized in that: in the step S6, six-pass shaping deformation is performed, and convex rollers are used in two passes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811025379.6A CN110871219A (en) | 2018-09-04 | 2018-09-04 | Cold roll forming process of high-strength steel square rectangular pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811025379.6A CN110871219A (en) | 2018-09-04 | 2018-09-04 | Cold roll forming process of high-strength steel square rectangular pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110871219A true CN110871219A (en) | 2020-03-10 |
Family
ID=69715996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811025379.6A Pending CN110871219A (en) | 2018-09-04 | 2018-09-04 | Cold roll forming process of high-strength steel square rectangular pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110871219A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112828070A (en) * | 2020-12-31 | 2021-05-25 | 燕山大学 | Cold bending forming process of square and rectangular pipe |
| CN112893614A (en) * | 2021-01-13 | 2021-06-04 | 江苏帝尔保机械有限公司 | Flexible roll bending forming die and process for multi-specification complex-section profile steel product |
| CN113385565A (en) * | 2021-07-08 | 2021-09-14 | 金乡县龙翔机械有限公司 | Thin-wall metal groove special-shaped pipe processing production line and special roller die thereof |
| CN114192624A (en) * | 2021-12-15 | 2022-03-18 | 四川攀钢嘉德精工科技有限公司 | Continuous cold-bending forming method for asymmetric upper side beam for railway vehicle |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000167621A (en) * | 1998-12-07 | 2000-06-20 | Nakajima Steel Pipe Co Ltd | Manufacture of square steel tube and device for forming square-shaped steel tube |
| CN1644473A (en) * | 2005-01-21 | 2005-07-27 | 上海俊昌钢管有限公司 | Rectangular and square structure of members and forming process for container |
| JP2011036916A (en) * | 2009-07-21 | 2011-02-24 | Olimpia 80 Srl | Variable linear geometry machine for continuously forming square tube |
| CN103962412A (en) * | 2009-02-05 | 2014-08-06 | 东普雷株式会社 | Square pipe manufacturing method |
| CN107030135A (en) * | 2017-06-16 | 2017-08-11 | 武汉钢铁江北集团有限公司 | A kind of double pointed angle square tube forming method of high-strength thick light section |
| CN108453153A (en) * | 2018-05-03 | 2018-08-28 | 石家庄富瑞沃机电设备有限公司 | A kind of roll device and forming method of square tube straight forming |
-
2018
- 2018-09-04 CN CN201811025379.6A patent/CN110871219A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000167621A (en) * | 1998-12-07 | 2000-06-20 | Nakajima Steel Pipe Co Ltd | Manufacture of square steel tube and device for forming square-shaped steel tube |
| CN1644473A (en) * | 2005-01-21 | 2005-07-27 | 上海俊昌钢管有限公司 | Rectangular and square structure of members and forming process for container |
| CN103962412A (en) * | 2009-02-05 | 2014-08-06 | 东普雷株式会社 | Square pipe manufacturing method |
| JP2011036916A (en) * | 2009-07-21 | 2011-02-24 | Olimpia 80 Srl | Variable linear geometry machine for continuously forming square tube |
| CN107030135A (en) * | 2017-06-16 | 2017-08-11 | 武汉钢铁江北集团有限公司 | A kind of double pointed angle square tube forming method of high-strength thick light section |
| CN108453153A (en) * | 2018-05-03 | 2018-08-28 | 石家庄富瑞沃机电设备有限公司 | A kind of roll device and forming method of square tube straight forming |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112828070A (en) * | 2020-12-31 | 2021-05-25 | 燕山大学 | Cold bending forming process of square and rectangular pipe |
| CN112828070B (en) * | 2020-12-31 | 2022-02-11 | 燕山大学 | Cold bending forming process of square and rectangular pipe |
| CN112893614A (en) * | 2021-01-13 | 2021-06-04 | 江苏帝尔保机械有限公司 | Flexible roll bending forming die and process for multi-specification complex-section profile steel product |
| CN113385565A (en) * | 2021-07-08 | 2021-09-14 | 金乡县龙翔机械有限公司 | Thin-wall metal groove special-shaped pipe processing production line and special roller die thereof |
| CN114192624A (en) * | 2021-12-15 | 2022-03-18 | 四川攀钢嘉德精工科技有限公司 | Continuous cold-bending forming method for asymmetric upper side beam for railway vehicle |
| CN114192624B (en) * | 2021-12-15 | 2023-09-26 | 四川攀钢嘉德精工科技有限公司 | Continuous cold-roll forming method of asymmetric upper side beam for railway vehicle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110871219A (en) | Cold roll forming process of high-strength steel square rectangular pipe | |
| CN107081571A (en) | The preparation method and television set surface frame of a kind of television set surface frame | |
| CN110202001B (en) | Roll system preparation method for rolling ultrathin ultra-wide stainless steel product and rolling method | |
| CN113319128B (en) | Variable contact working roll and roll shape design method thereof | |
| CN104874607B (en) | A kind of working roll and its roll contour design method for cold rolling Edge Drop Control | |
| CN103317312A (en) | Method for manufacturing finned square rectangular steel tube | |
| CN112642898B (en) | Cold roll forming method for special-shaped rod with mounting groove | |
| JP4376602B2 (en) | Metal material processing method and metal processed product | |
| CN105598163A (en) | Process for rolling metal composite rod with corrugated bonding surface | |
| JPH02307686A (en) | Production of stainless electric welded steel tube | |
| CN113967672B (en) | Forming method of right trapezoid-section steel pipe | |
| CN110369510A (en) | A kind of multidirectional rolling prepares the roll and method of agglomerate body grained material | |
| WO2022134493A1 (en) | Cold roll forming method for special-shaped rod having mounting grooves | |
| CN109848268B (en) | Method for continuously controlling flatness of edge waves of corrugated board and manufacturing die thereof | |
| JP2004148337A (en) | Method for forming joined part of welded steel pipe and apparatus for producing the welded steel pipe | |
| CN112658190B (en) | Steel ingot CWFF forging method and convex wide anvil | |
| CN206406994U (en) | Longeron light-weight design structure on a kind of preceding floor of poor slab | |
| CN216383564U (en) | Anti-torsion universal folding section bar | |
| JPS60250803A (en) | Production of channel steel | |
| JP2692176B2 (en) | Welded pipe manufacturing equipment | |
| CN110170521B (en) | Rolling forming process and roller structure for convex-concave special-shaped plate | |
| CN219924308U (en) | Draw bead structure and side wall outer plate drawing die | |
| KR101192579B1 (en) | Curved surface forming method of t-bar by rolling | |
| JPH04339522A (en) | Diameter shrinkage-working method for end part in metallic pipe | |
| JPS62156001A (en) | Production of channel steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |