High-strength hot-rolling automobile longitudinal beam material and longitudinal beam manufacturing method
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A technology for automobile longitudinal beams and a manufacturing method, which is applied to vehicle components, substructures, transportation and packaging, etc., can solve the problems of difficult forming of high-strength automobile longitudinal beams, and achieve the effects of reducing self-weight, reducing fuel consumption and obvious social benefits.
Active Publication Date: 2012-11-21
SINO TRUK JINAN POWER
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[0003] The purpose of the present invention is to solve the problem that the high-strength automobile longitudinal beam is difficult...
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Embodiment 1
[0026] Take a longitudinal beam with a length of 6750mm and a section specification of 300×90×8 as an example for illustration.
[0027] to combine Figure 1 to Figure 3 , a high-strength hot-rolled automobile longitudinal beam material, the chemical composition of the longitudinal beam material is: C: 0.063%, Si: 0.10%, Mn: 1.85%, P: 0.008%, S: 0.002%, Ti: 0.11%, Nb: 0.054%, Al: 0.043%, and the balance is Fe. The mechanical properties of the longitudinal beam are: R P0.2 =815MPa, Rm=885MPa,A 5 =20%, using 8mm thick hot-rolled girder steel plate 2.
[0028] A method for forming a high-strength hot-rolled automobile side member, comprising the following steps:
[0029] 1) Uncoiling, leveling and slitting the girder steel plate 2 with a slitting cutter; the material of the slitting cutter: H13, the hardness of the cutter: 58-60HRC, and the gap between the slitting cutters: 8-10mm.
[0030] 2) The girder steel plate 2 is rolled and formed by forming rollers; 15 sets of formi...
Embodiment 2
[0035] Take a longitudinal beam with a length of 6750mm and a section specification of 300×90×8 as an example for illustration. The chemical composition of the high-strength hot-rolled automobile longitudinal beam material is as follows: C: 0.065%, Si: 0.15%, Mn: 1.85%, P: 0.009%, S: 0.0015%, V: 0.010%, Ti: 0.10% , Nb: 0.05%, Al: 0.041, and the balance is Fe. The mechanical properties of the steel plate are: R P0.2 =798MPa, Rm=859MPa, A 5 =22%.
Embodiment 3
[0037] Take a longitudinal beam with a length of 6750mm and a section specification of 300×90×8 as an example for illustration. The chemical composition of high-strength hot-rolled automotive longitudinal beam materials is as follows: C: 0.075%, Si: 0.07%, Mn: 1.84%, P: 0.01%, S: 0.0029%, V: 0.010%, Ti: 0.11% , Nb: 0.053%, Al: 0.038%, and the balance is Fe. The mechanical properties of the steel plate are: R P0.2 =813MPa, Rm=875MPa,A 5 =23%.
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Abstract
The invention discloses a high-strength hot-rolling automobile longitudinal beam material and a longitudinal beam manufacturing method. The longitudinal beam comprises the following chemical components in weight percent: 0.04-0.10% of C, 0.05-0.12% of Si, 1.70-2.10% of Mn, less than or equal to 0.025% of P, less than or equal to 0.10% of S, less than or equal to 0.020% of V, 0.08-0.15% of Ti, 0.04-0.09% of Nb, 0.015-0.065% of Al and the balance of Fe; the method comprises the following steps of: 1) uncoiling, flattening and stripping large beam steel plates by using a stripping cutter; 2) molding large beam steel plates in a molding roller forming mode; 3) cutting down the large beam steel plates by using a cutting module through a 45-degree beveling process; and 4) punching holes on the large beam steel plates digitally, and hot-rolling the large beam steel plates to be longitudinal beams of present lengths and cross section specifications. Automobile longitudinal beam steel plates for the longitudinal beam is high in strength, easy to mold and is applicable to molding of longitudinal beam steel plates with a 700MPa grade; desired equipment is small in tonnage; surface of the longitudinal beam is good in quality; a automobile frame longitudinal beam is changed from a double-layer automobile frame into a signal-layer automobile frame; a signal automobile is reduced by more than 300kg, so that purposes of reducing the self-weight of the automobile and reducing fuel consumption are achieved, and significant social benefits are obtained.
Description
technical field [0001] The invention relates to the technical field of automobiles, in particular to a high-strength hot-rolled automobile longitudinal beam material and a method for manufacturing the longitudinal beam. Background technique [0002] The car frame is composed of girders and other components composed of longitudinal beams and cross beams. It is supported on the wheels through suspension devices, front axles, and rear axles. It must have sufficient strength and rigidity to withstand the load of the car and the impact of various complex working conditions. . Automobile longitudinal beams are generally made of high-strength steel plates through stamping or roll forming. As the strength of steel plates increases, the stamping force required by stamping machines increases, and the amount of springback after stamping will also increase. Therefore, high-strength automobile longitudinal beams Beams are generally formed by roll forming. Since the car frame is general...
Claims
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