Square rectangular steel pipe with corner thickening and cold-heat composite molding and preparation method thereof
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A composite forming, rectangular steel pipe technology, used in heat treatment equipment, pipes, rigid pipes, etc., to achieve the effects of improved shape accuracy and performance quality, stronger ductility, and changed corner radius
Pending Publication Date: 2020-01-24
SINO RES INST OF ROLL FORMING IND CAOFEIDIAN CO LTD
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[0004] In order to solve the defects of the corners of traditional cold-formed square rectangular steel pipes, the present invention proposes a square rectangular steel pipe with thickened corners formed by cold and heat composite molding and its preparation method
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Embodiment 1
[0059] (1) Pre-bent the Q235 steel plate into a pre-formed rectangular tube with an external corner radius of R=20.0mm, the size is 200*200mm, the wall thickness of the flat plate area is 8.0mm, and the corner wall thickness is 7.8mm.
[0060] (2) Feed the pre-formed rectangular tube through the guide roller into the local induction heating device, the heating temperature is 1050℃, and the heating time is 15 seconds;
[0061] (3) After five fine forming units are formed, the temperature of the flame spray gun insulation system between each two forming units is 950℃, and the roller diameter difference between each two adjacent fine forming units is 3mm. The deformation degree of the forming unit is about 3%.
[0062] (4) After thermal finishing, a rectangular tube with a size of 193*193mm, a flat area wall thickness of 8mm, a corner wall thickness of 8.8mm, and an outer corner radius of 2mm, is obtained. After quality inspection, the cold and hot composite formed The residual stress ...
Embodiment 2
[0064] (1) Pre-bent the Q235 steel plate into a pre-formed rectangular tube with an external corner radius R=36.0mm, with a size of 400*400mm, in which the wall thickness of the flat plate area is 20.0mm, and the corner wall thickness is 19.6mm.
[0065] (2) Feed the pre-formed rectangular tube through the guide roller into the local induction heating device, the heating temperature is 1000℃, and the heating time is 15 seconds;
[0066] (3) After five fine forming units are formed, the temperature of the flame spray gun insulation system between each two forming units is 950℃, and the roller diameter difference between each two adjacent fine forming units is 3mm. The deformation degree of the forming unit is about 3%.
[0067] (4) After thermal finishing, a rectangular tube with a size of 388*388mm, a wall thickness of 20.0mm in the flat area, a wall thickness of 22.1mm at the corners, and a radius of outer corners of 5mm is obtained. The residual stress of the formed rectangular tu...
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Abstract
The invention discloses a square rectangular steel pipe with corner thickening and cold-heat composite molding and a preparation method thereof. The outer corner radius of the square rectangular steelpipe satisfies the following conditions: when t is less than or equal to 6mm, R is greater than 0 and less than 2.0t; when t is greater than 6 and less than or equal to 10mm, R is greater than 0 andless than 2.5t; and when t is greater than 10mm, R is greater than 0 and less than 3.0t, wherein t is the wall thickness of the straight pipe section of the square rectangular steel pipe, R is the outer corner radius of the four corners of the square rectangular steel pipe, and the corner wall thickness of the square rectangular steel pipe is between 1.0t and 1.8t. According to the square rectangular steel pipe with corner thickening and cold-heat composite molding and the preparation method thereof, the hot forming technology is introduced into a traditional roll-bending forming process, thatis, the local induction heating technology. High temperatures can reduce the forming force of materials and improve the forming performance of the materials; and meanwhile, the phenomena of the residual stress caused by work hardening and cracking which is possibly caused can be eliminated, a corner profile of the square rectangular steel pipe subjected to cold-heat composite molding is dense, the radii of an inner corner and an outer corner are small, the angle of the corner is close to 90 degrees, and the corner is thickened.
Description
Technical field [0001] The present invention relates to the technical field of metal material processing, and more particularly, to a square and rectangular steel pipe formed by a combination of cold and heat with thickened corners and a preparation method. Background technique [0002] Nowadays, people are increasingly pursuing weight reduction. The rectangular tube is the carrier to promote the development of lightweight. For example, the rectangular tube in the steel structure relies on its own structural characteristics, which can reduce about 80% compared with the original brick-concrete structure. The yield strength is high, the bending section modulus is large, the shear center and the centroid overlap, the torsion resistance is good, and the construction is fast; compared with other steels, such as H-shaped steel and round pipe, the square tube has outstanding advantages in comprehensive performance. Known as the best steel structure column material. [0003] However, the ...
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