CN102785697A - High-strength hot-rolling automobile longitudinal beam material and longitudinal beam manufacturing method - Google Patents
High-strength hot-rolling automobile longitudinal beam material and longitudinal beam manufacturing method Download PDFInfo
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- CN102785697A CN102785697A CN2012103190155A CN201210319015A CN102785697A CN 102785697 A CN102785697 A CN 102785697A CN 2012103190155 A CN2012103190155 A CN 2012103190155A CN 201210319015 A CN201210319015 A CN 201210319015A CN 102785697 A CN102785697 A CN 102785697A
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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
The present invention relates to automobile technical field, relate in particular to a kind of high-strength hot-rolled automobile longitudinal girder material and longeron manufacturing approach.
Background technology
Automobile chassis frame is made up of the parts such as crossbeam that longitudinal and cross beam constitutes, and is bearing on the wheel via suspension gear, propons, back axle, enough strength and stiffness must be arranged and bear the load of automobile and the impact under the various complex working condition.Automobile longitudinal girder generally adopts high tensile steel plate to process through punching press or flow forming; Raising along with armor plate strength; The stamping press of required press increases, and the springback capacity after the punching press also will increase, so flow forming is generally adopted in the moulding of high-strength vehicle longeron.Because the general employing of automobile chassis frame is cold-formed; Adopt connection modes such as bolted connection or welding between the longitudinal and cross beam; Vehicle frame bears the impact under compartment, lade weight and the extraneous various complex working condition; Therefore automobile longitudinal girder must have high strength, impact property and cold-bending property preferably with steel plate, to adapt to the cold forming process processing request.Encouraging fully to excavate the loss of weight and the lightweight potentiality of auto parts and components under the energy-conservation environment of loss of weight in country simultaneously, is the long-term problem that auto trade material technology personnel face.Prior art is for improving the delelivered payload capability of automobile; The heavy motor vehicle vehicle frame adopts twin beams usually, i.e. the method for longeron liner auxiliary girder, the defective that this structure exists are that the weight of automobile self strengthens; This not only increases manufacturing cost, has also increased vehicle weight and fuel oil consumption.Automobile longitudinal girder is generally micro-alloy high-strength steel with steel plate, and yield strength is the 500-650MPa rank; Certain heavy motor vehicle vehicle frame of Germany is also mostly to be yield strength 500MPa level steel plate, and forming process adopts flow forming more.The defective that the chassis side rail of this intensity rank exists is that the truck frame load-carrying capacity is not enough.
Summary of the invention
The object of the invention is exactly in order to solve the problem of the difficult moulding of high-strength vehicle longeron; A kind of high-strength hot-rolled automobile longitudinal girder material and longeron manufacturing approach are provided.Hot Rolling Automobile longeron steel plate of the present invention has the intensity height, is easy to moulding, is applicable to the moulding of 700MPa rank longeron steel plate; The equipment needed thereby tonnage is little, and the longeron surface quality is good, and chassis side rail becomes the individual layer vehicle frame by the double-deck vehicle frame that adopts the major and minor beam of low-intensity to match; Bicycle can be realized more than the loss of weight 300kg; Reach and alleviate automotive dead weight, reduce the purpose of fuel oil consumption, obvious social is arranged.
The forming method that a kind of high-strength hot-rolled automobile longitudinal girder also is provided of the present invention.
To achieve these goals, the present invention adopts following technical scheme:
A kind of high-strength hot-rolled automobile longitudinal girder material, the chemical constitution of said longeron material percentum by weight is: C:0.04～0.10%, Si:0.05～0.12%, Mn:1.70～2.10%, P: S≤0.025%: V≤0.010% :≤0.020%, Ti:0.08～0.15%, Nb:0.04～0.09%, Al:0.015～0.065%, surplus are Fe.
A kind of high-strength hot-rolled automobile longitudinal girder manufacturing approach may further comprise the steps:
1) utilize bar breaking tool that beam steel plate is carried out uncoiling, leveling, itemize;
2) beam steel plate is through the format roll flow forming;
3) adopt 45 ° of technologies of cutting sth. askew to cut off beam steel plate through cutting off mould;
4) beam steel plate numerical control punching;
Said step 1) is divided the bar breaking tool material of strip adoption: H13, cutter hardness: 58-60HRC, bar breaking tool gap: 8-10mm.
Said step 2) adopts 15 sleeve forming rollers; Every sleeve forming roller comprises a drive roll, two driven vollers respectively; Every sleeve forming roller makes the deformation angle of beam steel plate be respectively: 0 ° on 1 roller, 15 ° on 2 rollers, 25 ° on 3 rollers, 35 ° on 4 rollers, 43 ° on 5 rollers, 51 ° on 6 rollers, 59 ° on 7 rollers, 67 ° on 8 rollers, 75 ° on 9 rollers, 81 ° on 10 rollers, 86 ° on 11 rollers, 12 rollers are 90 ° later on, and the distance between every sleeve forming roller is 1000mm.
The cut-out mould of said step 3) comprises fixed blade, and cutting blade, material are H13, hardness 58-60HRC, and cutting blade R angular radius is 0-14mm, the cutting off tool gap is 0.8-1.2mm.
Said beam steel plate mechanical property is: R
P0.2>=700MPa, Rm 750～950MPa, A
5>=15%.
Principle of work of the present invention: the chemical constitution of longeron of the present invention percentum by weight is: C:0.04～0.10%, Si:0.05～0.12%, Mn:1.70～2.10%, P: S≤0.025%: V≤0.010% :≤0.020%, Ti:0.08～0.15%, Nb:0.04～0.09%, Al:0.015～0.065%, surplus are Fe.Its mechanical property is: R
P0.2>=700MPa, Rm 750～950MPa, A
5>=15%.Longeron of the present invention is through the following steps manufacturing: 1) beam steel plate is carried out uncoiling, leveling, itemize; 2) beam steel plate is through the format roll flow forming; 3) adopt 45 ° of technologies of cutting sth. askew to cut off beam steel plate through cutting off mould; 4) beam steel plate numerical control punching; After the numerical control punching, the hot rolling beam steel plate becomes the longeron of predetermined length, cross section specification.Step 2) adopts 15 sleeve forming rollers; Every sleeve forming roller comprises a drive roll, two driven vollers respectively; Every sleeve forming roller makes the deformation angle of beam steel plate be respectively: 0 ° on 1 roller, 15 ° on 2 rollers, 25 ° on 3 rollers, 35 ° on 4 rollers, 43 ° on 5 rollers, 51 ° on 6 rollers, 59 ° on 7 rollers, 67 ° on 8 rollers, 75 ° on 9 rollers, 81 ° on 10 rollers, 86 ° on 11 rollers, 12 rollers are 90 ° later on, and the distance between every sleeve forming roller is 1000mm.
Beneficial effect of the present invention:
1. compare with punch forming, the high-strength hot-rolled longeron of flow forming, the equipment needed thereby tonnage is little, and the longeron surface quality is good;
2. the above longeron of employing Yield strength 700 MPa grade; Strength of material improves more than 40%; Chassis side rail becomes the individual layer vehicle frame by the double-deck vehicle frame that adopts the major and minor beam of low-intensity to match, and bicycle can realize more than the loss of weight 300kg, reaches to alleviate automotive dead weight; Reduce the purpose of fuel oil consumption, obvious social is arranged.
Description of drawings
Fig. 1 is the format roll structural representation;
Fig. 2 is for cutting off the mould structure scheme drawing;
Fig. 3 is the left view of Fig. 2;
Among the figure, 1. drive roll, 2. beam steel plate, 3. driven voller, 4. fixed blade, 5. cutting blade.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Longerons long with 6750mm, 300 * 90 * 8 cross section specifications are that example describes.
In conjunction with Fig. 1 to Fig. 3; A kind of high-strength hot-rolled automobile longitudinal girder material; The chemical constitution of said longeron material percentum by weight 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%, surplus is Fe.The mechanical property of said longeron is: R
P0.2=815MPa, Rm=885MPa, A
5=20%, adopt 8mm thickness hot rolling beam steel plate 2.
A kind of forming method of high-strength hot-rolled automobile longitudinal girder may further comprise the steps:
1) utilize bar breaking tool that beam steel plate 2 is carried out uncoiling, leveling, itemize; Bar breaking tool material: H13, cutter hardness: 58-60HRC, bar breaking tool gap: 8-10mm.
2) beam steel plate 2 is through the format roll flow forming; Adopt 15 sleeve forming rollers; Every sleeve forming roller comprises a drive roll 1, two driven vollers 3 respectively; Every sleeve forming roller makes the deformation angle of beam steel plate 2 be respectively: 0 ° on 1 roller, 15 ° on 2 rollers, 25 ° on 3 rollers, 35 ° on 4 rollers, 43 ° on 5 rollers, 51 ° on 6 rollers, 59 ° on 7 rollers, 67 ° on 8 rollers, 75 ° on 9 rollers, 81 ° on 10 rollers, 86 ° on 11 rollers, 12 rollers are 90 ° later on, and the distance between every sleeve forming roller is 1000mm.The structure of expressing the 5th sleeve forming roller among Fig. 1 makes the deformation angle of beam steel plate 2 and level be 43 °.
3) adopt 45 ° of technologies of cutting sth. askew to cut off beam steel plate through cutting off mould; Cut off mould and comprise fixed blade 4, cutting blade 5, its material are H13, hardness 58-60HRC, and cutting off moving knife R angular radius is 12mm, the cutting off tool gap L is 1.0mm.
4) be rolled into longeron after, adopt the punching of 02M305 numerical control punching machine.
The hot rolling beam steel plate becomes the longeron of predetermined length, cross section specification.Steel plate is processed the longeron of 6750mm length, 300 * 90 * 8 cross section specifications through above-mentioned steps.
Longerons long with 6750mm, 300 * 90 * 8 cross section specifications are that example describes.The chemical constitution of high-strength hot-rolled automobile longitudinal girder material percentum by weight is: 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, surplus are Fe.The mechanical property of steel plate is: R
P0.2=798MPa, Rm=859MPa, A
5=22%.
Longerons long with 6750mm, 300 * 90 * 8 cross section specifications are that example describes.The chemical constitution of high-strength hot-rolled automobile longitudinal girder material percentum by weight is: 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%, surplus are Fe.The mechanical property of steel plate is: R
P0.2=813MPa, Rm=875MPa, A
5=23%.
Embodiment 4
Longerons long with 6750mm, 300 * 90 * 8 cross section specifications are that example describes.The chemical constitution of high-strength hot-rolled automobile longitudinal girder material percentum by weight is: C:0.076%, Si:0.10%, Mn:1.86%, P:0.012%, S:0.0028%, V:0.001%, Ti:0.10%, Nb:0.058%, Al:0.030%, surplus are Fe.The mechanical property of steel plate is: R
P0.2=751MPa, Rm=823MPa, A
5=20%.
Adopt the high-strength hot-rolled longeron of 8mm thickness hot rolling beam steel plate 2 flow formings, mechanical property has reached: R
P0.2: 751～815MPa, Rm:823～885MPa, A
5: 20～23%, to compare the major and minor beam of yield strength 500MPa level and use steel plate, strength of material improves more than 40%, and yield strength is high, and the longeron surface quality is good; Bicycle can realize more than the loss of weight 300kg, reaches to alleviate automotive dead weight, reduces the purpose of fuel oil consumption, and obvious social is arranged.
Though the above-mentioned accompanying drawing that combines is described the specific embodiment of invention; But be not restriction to protection domain of the present invention; One of ordinary skill in the art should be understood that; On the basis of technical scheme of the present invention, those skilled in the art need not pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (7)
1. high-strength hot-rolled automobile longitudinal girder material; It is characterized in that the chemical constitution of said longeron material percentum by weight is: C:0.04～0.10%, Si:0.05～0.12%, Mn:1.70～2.10%, P: S≤0.025%: V≤0.010% :≤0.020%, Ti:0.08～0.15%, Nb:0.04～0.09%, Al:0.015～0.065%, surplus are Fe.
2. high-strength hot-rolled automobile longitudinal girder material; It is characterized in that; The chemical constitution of said longeron material percentum by weight 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%, surplus is Fe.
3. like claim 1 or 2 described high-strength hot-rolled automobile longitudinal girder manufacturing approaches, may further comprise the steps:
1) utilize bar breaking tool that the beam steel plate of mentioned component is carried out uncoiling, leveling, itemize;
2) beam steel plate is through the format roll flow forming;
3) adopt 45 ° of technologies of cutting sth. askew to cut off beam steel plate through cutting off mould;
4) beam steel plate numerical control punching.
4. high-strength hot-rolled automobile longitudinal girder manufacturing approach as claimed in claim 3 is characterized in that said step 1) is divided the bar breaking tool material of strip adoption: H13, cutter hardness: 58-60HRC, bar breaking tool gap: 8-10mm.
5. high-strength hot-rolled automobile longitudinal girder manufacturing approach as claimed in claim 3; It is characterized in that; Said step 2) adopts 15 sleeve forming rollers; Every sleeve forming roller comprises a drive roll, two driven vollers respectively; Format roll makes the deformation angle of beam steel plate be respectively: 0 ° on 1 roller, 15 ° on 2 rollers, 25 ° on 3 rollers, 35 ° on 4 rollers, 43 ° on 5 rollers, 51 ° on 6 rollers, 59 ° on 7 rollers, 67 ° on 8 rollers, 75 ° on 9 rollers, 81 ° on 10 rollers, 86 ° on 11 rollers, 12 rollers are 90 ° later on, and the distance between every sleeve forming roller is 1000mm.
6. high-strength hot-rolled automobile longitudinal girder manufacturing approach as claimed in claim 3 is characterized in that the cut-out mould of said step 3) comprises fixed blade, cutting blade; Material is H13; Hardness 58-60HRC, cutting blade R angular radius is 0-14mm, the cutting off tool gap is 0.8-1.2mm.
7. high-strength hot-rolled automobile longitudinal girder manufacturing approach as claimed in claim 3 is characterized in that said beam steel plate mechanical property is: R
P0.2>=700MPa, Rm 750～950MPa, A
5>=15%.
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| CN102941878A (en) * | 2012-11-27 | 2013-02-27 | 东风柳州汽车有限公司 | Heavy lorry frame |
| CN103230934A (en) * | 2013-05-23 | 2013-08-07 | 北京门窗发展有限公司 | B-type profile rolling forming equipment and implementation method thereof |
| CN104264049A (en) * | 2014-09-24 | 2015-01-07 | 无锡康柏斯机械科技有限公司 | Steel plate for automobile girder and method for manufacturing automobile girder |
| CN104805359A (en) * | 2015-05-13 | 2015-07-29 | 东北大学 | Automobile beam steel with tensile strength of 610MPa and preparation method for automobile beam steel |
| CN104831167A (en) * | 2015-04-28 | 2015-08-12 | 河北钢铁股份有限公司承德分公司 | Q550E high-strength steel hot rolled coil and production method thereof |
| CN104988392A (en) * | 2015-07-17 | 2015-10-21 | 武汉钢铁(集团)公司 | Steel for 610 MPa grade low-cost girder and ultrafast cooling manufacturing method thereof |
| CN110153277A (en) * | 2019-05-23 | 2019-08-23 | 雅安宸皓机械有限公司 | Heavy goods vehicles spandrel girder processing technology |
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| CN104264049A (en) * | 2014-09-24 | 2015-01-07 | 无锡康柏斯机械科技有限公司 | Steel plate for automobile girder and method for manufacturing automobile girder |
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| CN104831167B (en) * | 2015-04-28 | 2016-08-24 | 河北钢铁股份有限公司承德分公司 | A kind of high-strength steel hot-rolled sheet coil of Q550E and production method thereof |
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| CN104988392A (en) * | 2015-07-17 | 2015-10-21 | 武汉钢铁(集团)公司 | Steel for 610 MPa grade low-cost girder and ultrafast cooling manufacturing method thereof |
| CN110153277A (en) * | 2019-05-23 | 2019-08-23 | 雅安宸皓机械有限公司 | Heavy goods vehicles spandrel girder processing technology |
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| CN102785697B (en) | 2015-04-22 |
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