CN105792979A - Structural component including a tempered transition zone - Google Patents
Structural component including a tempered transition zone Download PDFInfo
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- CN105792979A CN105792979A CN201480063379.9A CN201480063379A CN105792979A CN 105792979 A CN105792979 A CN 105792979A CN 201480063379 A CN201480063379 A CN 201480063379A CN 105792979 A CN105792979 A CN 105792979A
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Abstract
The invention provides a hot stamped structural component (20) for an automotive vehicle, such as a B -pillar, including a first part (22) formed of a high strength steel material joined to a second part (24) formed of a high ductility steel material. The structural component (20) also includes a locally tempered transition zone (26) along the joint (28) to reduce the potential for failure along the joint (28). The transition zone (26) has strength and ductility levels between the strength and ductility levels of the remaining portions of the first and second parts (22, 24). The tempering step can be incorporated into a laser trimming cell or assembly cell, and thus the transition zone (26) can be created without adding an additional process step or increasing cycle time.
Description
The cross reference of related application
nullThe application of this PCT Patent requires in submission on November 17th, 2014、Name is called " StructuralComponentIncludingATemperedTransitionZone (includes the structure member of tempered transition region) "、Serial number is 14/543,The rights and interests of the U.S. Patent application of 482，This U.S. Patent application requires in submission on November 25th, 2013、Name is called " StructuralComponentIncludingATemperedTransitionZone (includes the structure member of tempered transition region) "、Serial number is 61/908,The rights and interests of the U.S. Provisional Patent Application of 379，The complete disclosure of these applications is considered as a part for present disclosure and is expressly incorporated herein by reference at this.
Technical field
The present invention generally relates to the thermoformed structure parts of motor vehicles and the method manufacturing these thermoformed structure parts.
Background technology
Structure member such as beam, post and guide rail for motor vehicles generally include firstth district with high intensity and secondth district with high ductibility.Have the process in these districts for realizing having some strength.These processes can include the not same district of single parts being heated or cooled to different temperature in mould and/or with different speed, the not same district of single parts being heated or cooled down.
Structure member including the district with varying strength and ductility can also by using welded steel billet to realize.This technology includes being soldered to the first blank formed by high-strength material the second blank formed by high ductility material, and makes welded blank thermoforming to provide structure member subsequently.In other companies, ArcelorMittal (the happy meter Ta Er in Ansai) company has been developed that the bi-material for manufacturing the welded structure member in motor vehicles, as ArcelorMittal, both materials include known and conductThe component with high intensity sold and known and conductThe component with high ductibility sold.
Summary of the invention
The present invention provides a kind of structure member, and this structure member includes Part I and the Part II that each free Steel material is formed, and this Part I and this Part II have the junction surface being disposed between.Part I has the first ductility, and Part II has the second ductility, and the second ductility is more than the first ductility.The part adjacent to junction surface of Part I and/or Part II adjacent to the part at junction surface in be formed with transition region.This transition region has the 3rd ductility between the first ductility and the second ductility.
Present invention also offers the method manufacturing the structure member including transition region.The method includes providing Part I and Part II, Part I and Part II to have the junction surface being disposed between, and wherein, Part II has the second ductility of the first ductility more than Part I.The method also includes the part adjacent to junction surface of the part adjacent to junction surface to Part I and/or Part II and is heated forming the transition region with the 3rd ductility, and wherein the 3rd ductility is between the first ductility and the second ductility.
Ductility adjacent to the transition region at junction surface achieves energy absorption when impacting, and is absent from along the separation at junction surface or breaks.Therefore, when structure member is used in motor vehicles, transition region reduces the probability during colliding along joint failure.Except being provided with the tempering characteristics helping energy absorption and vehicle collision strategy, structure member provided by the invention and method can adopt existing material, such as adoptPart I and employing for high intensityPart II for high ductibility.
Furthermore it is possible to formed the local transition region of structure member by tempering by using relatively inexpensive heating system such as laser to prune the heating system in unit or module units.Therefore, there is no need to indirectly processing and form transition region, from without the commonly required extra cost for instrument and maintenance thereof wanted of drawing process (in-dietemperingprocess) or relevant quality control cost in such as mould.Prune formation transition region in unit or module units at laser and additionally provide procedure of processing and the circulation time of minimizing.Owing to the method for the present invention does not have the tempering method complexity of prior art, so needing less capital investment.Furthermore, it is possible to regulate the size of transition region by simply changing the induction coil in post-treatment unit, rather than in the tempering method of prior art mould is carried out big amendment.
Accompanying drawing explanation
When considered in conjunction with the accompanying drawings, by referring to described in detail below, the present invention becomes better understood, and other advantages of the present invention are readily able to be appreciated simultaneously, in the accompanying drawings:
Fig. 1 illustrates the exemplary structure member through drop stamping, this structure member includes the Part I formed by high-strength material, this Part I is soldered to the Part II formed by high ductility material, and this structure member includes the transition region adjacent to welded joint；And
Fig. 2 illustrates the first blank being soldered to the second blank, and this first blank and this second blank are for forming the structure member of Fig. 1.
Detailed description of the invention
Present invention provide for the structure member 20 through thermoforming of motor vehicles, such as B post, this structure member 20 includes the Part I 22 with high intensity, this Part I 22 engages to the Part II 24 with high ductibility, and the invention provides the method manufacturing structure member 20 as shown in Figure 1.Extend along the region adjacent to junction surface 28 of structure member 20 through the transition region 26 of localized tempering.Transition region 26 generally include Part I 22 adjacent to junction surface 28, a such as part less than the 50% of the volume of Part I 22.Transition region 26 can also include Part II 24 adjacent to junction surface 28, a such as part less than the 50% of the volume of Part II 24.The ductility level of transition region 26 is between the ductility level of the ductility level of the adjacent part of Part I 22 and the adjacent part of Part II 24.The intensity of transition region 26 can also be different from the intensity of the intensity of the adjacent part of Part I 22 and the adjacent part of Part II 24.In the exemplary embodiment, structure member 20 is manufactured in the following way efficiently: to the steel sheet blank shown in Fig. 2 such asBlank 30 HeBlank 32 carries out drop stamping, and subsequently the part adjacent to junction surface 28 of the part 22,24 through drop stamping is carried out tempering to provide transition region 26, as shown in fig. 1.Transition region 26 provides the in check tempering characteristics in motor vehicle component.Such as, the ductility of transition region 26 contributes to carrying out energy absorption during impacting and reducing the probability broken along junction surface 28 or separate.
The first blank 30 for forming the Part I 22 of the high intensity of structure member 20 includes being referred to as the Steel material of the first Steel material.However, it is possible to use various different steel alloys, in the exemplary embodiment, the first blank 30 includes coated compacting hardening steel alloy, such as1500P.This steel alloy amount of comprising be the percentage by weight (wt.%) being not more than 0.25 carbon, amount for be not more than 1.4wt.% manganese, amount for be not more than 0.35wt.% silicon, amount for be not more than 0.3wt.% chromium, amount for be not more than the boron of 0.005wt.% and the ferrum of surplus.Before thermoforming, the first blank 30 of illustrative embodiments has the micro structure including ferrite and pearlite.First blank 30 also have the ultimate tensile strength (UTS) of 500Mpa to 700Mpa, the yield strength (YS) of 350Mpa to 550Mpa and at least 10% elongation percentage (ef)(L0=80mm and th < 3mm).
The geometry of the first blank 30 can change according to the type of structure member 20 to be formed.Generally, the first blank 30 includes first end 34, and this first end 34 extends longitudinally into the second end 36.In the exemplary embodiment, the first blank 30 is designed to act as the B post of motor vehicles and therefore includes being positioned at the foot section at first end 34 place and extend to longitudinal section of the second end 36 from foot section, as shown in Figure 2.But, the geometry of the first blank 30 can be designed to provide for the another type of post of motor vehicles, track, beam, reinforcement, ring, framework or body part alternatively.First blank 30 is also designed to apply for non power driven vehicle.The thickness of the first blank 30 can be uniform or can change along the length of the first blank 30.This thickness is generally 1mm to 2mm for applying for motor vehicles, and in the exemplary embodiment, the thickness of the first blank 30 is about 1.5mm.
First blank 30 is preferably coated to prevent burn into from increasing the rate of heat addition and preventing the crack in Steel material during thermoforming process.In the exemplary embodiment, the coating amount of comprising is the aluminum of 90wt.% and measures the silicon for 10wt.%.However, it is possible to use other kinds of coating, such as spelter coating.Coating is generally of the average thickness of 25 μm when being applied to the first blank 30 that thickness is 1mm to 2mm.
The second blank 32 for forming the Part II 24 of the high ductibility of structure member 20 is also formed by the Steel material being referred to as the second Steel material.Second Steel material can also include various types of Steel material.In the exemplary embodiment, the second Steel material 32 includes the compacting hardening steel alloy of uncoated, such as500P。
The geometry of the second blank 32 can change according to the type of structure member 20 to be formed.But, the second blank 32 generally includes first end 35, and this first end 35 extends longitudinally into the second end 37.In the exemplary embodiment, wherein, the second blank 32 is designed in B post to use, and this second blank 32 includes extending to longitudinal section of the second end 37 from first end 35 and being positioned at the foot section of the second end 37, as shown in Figure 2.In this embodiment, the width of the first end 35 of Part II 24 is approximately equal to the width of the second end 36 of Part I 22.Alternatively, the geometry of the second blank 32 can be designed to provide for the another type of post of motor vehicles, track, beam, reinforcement, ring, framework or body part.Second blank 32 is also designed to the application for non power driven vehicle.The thickness of the second blank 32 can be uniform or can change along the length of the second blank 32.But, this thickness is generally 1mm to 2mm for motor vehicles application.In the exemplary embodiment, the thickness of the second blank 32 is 1.5mm.
The method of manufacture structure member 20 generally includes and engages to the second blank 32 first blank 30 to form junction surface 28.In the exemplary embodiment, the second end 36 of the first blank 30 is laser welded to the first end 35 of the second blank 32 to form junction surface 28 (that is, weld part), as shown in Figure 2.However, it is possible to use various other kinds of joining techniques, such as resistance spot welding, arc welding, Metallic Inert Gas (MIG) welding, metal active gas (MAG) welding and soldering.
When the first blank 30 and the second blank 32 are joined together, blank 30,32 is thermoformed to provide the structure member 20 with required form.Various different thermoforming process can be used.In the exemplary embodiment, this thermoforming process includes, after blank 30,32 is joined together, the first blank 30 and the second blank 32 are carried out drop stamping.First exemplary hot stamping operation includes: by the temperature 5 to 10 minutes of welded blank 30,32 heating to 900 DEG C to 950 DEG C in stove.During this step, the Steel material of the first blank 30 and the second blank 32 is changed into austenite microstructure.It follows that example process includes heated blank 30,32 is transferred to mould, wherein, the transfer time from stove to mould is preferably less than 7 seconds.Next the method includes in a mold heated blank 30,32 being carried out punching press while blank 30,32 is still in the temperature of 600 DEG C to 800 DEG C.This mould makes heated blank 30,32 be shaped to the Part I 22 and Part II 24 with reservation shape.After the punching step and while mould is still closed and part 22,24 is still located in mould, illustrative methods includes with the speed more than 50 DEG C per second, Part I 22 being quenched and with the speed more than 30 DEG C per second, Part II 24 being quenched.Quenching Step can include carrying out shrend fire with higher speed alternatively.During quenching Step, the micro structure of Part I 22 is changed into martensite from austenite, and the micro structure of Part II 24 is changed into the mixture of ferrite and martensite from austenite.As stated, this hot stamping operation is only used as example and is provided, and can use other hot stamping operation various or thermoforming process.
After thermoforming process, the intensity of Part I 22 is still greater than the intensity of Part II 24, and the ductility of Part II 24 is still greater than the ductility of Part I 22.Here, during this process, in whole Part I 22, intensity and ductility are usually uniform, and in whole Part II 24, intensity and ductility are usually uniform.In the exemplary embodiment, wherein, Part I 22 by1500P formed, Part I 22 have the ultimate tensile strength (UTS) of Isosorbide-5-Nitrae 00Mpa to 1,600Mpa, 1,000Mpa to 1,200Mpa yield strength (YS), at least 5% to 6% elongation percentage (ef)(L0=80mm and th < 3mm) and hardness less than 490.This Part II 24 of the Part II 24 of illustrative embodiments by500P formed have the ultimate tensile strength (UTS) of 550Mpa to 700Mpa, the yield strength (YS) of 370Mpa to 470Mpa and at least 17% elongation percentage (ef)(L0=80mm and th < 3mm).But, Part I 22 can be different from this example with the characteristic of Part II 24.
Manufacture the method for structure member 20 also to include being heated forming transition region 26 along junction surface and adjacent at least one region at junction surface and/or at least one region along junction surface and adjacent to junction surface of Part II 24 to Part I 22.Such as, transition region 26 can be only located in Part I 22, be only located in Part II 24 or be arranged in a part for both Part I 22 and Part II 24.After drop stamping step, outside mould, carry out this heating steps, and this heating steps is preferably pruned in unit or module units at laser and carried out.Alternatively, this heating steps can provide as secondary process.Heating steps for forming transition region 26 can include the heat treatment of tempering, annealing or any other type.Introduce the ductility level of transition region 26 in structure member 20 between the ductility level of the ductility level of the adjacent part of Part I 22 and the adjacent part of Part II 24, to absorb energy during colliding.The intensity level of transition region 26 can also between the intensity level of the adjacent part of Part I 22 from the intensity level of the adjacent part of Part II 24 or different with the intensity level of the intensity level of the adjacent part of Part I 22 and the adjacent part of Part II 24.The ductility of transition region 26 can pass through elongation percentage (ef) determine, and the intensity of transition region 26 can pass through ultimate tensile strength (UTS) or yield strength (YS) is determined.Steel material according to blank 30,32 and thickness are changed by the time of heating steps and temperature.Additionally, time and temperature can be conditioned to meet for the tempering characteristics needed for every kind of application-specific.
In an exemplary embodiment, the step introducing transition region 26 includes the part adjacent to laser weld junction surface 28 to Part I 22 and carries out tempering partly and the part adjacent to laser weld junction surface 28 of Part II 24 is carried out tempering partly.The tempered part of Part I 22 positions adjacent to the second end 36 of Part I 22, and the tempered part of Part II 24 positions adjacent to the first end 35 of Part II 24, as shown in fig. 1.After blank 30,32 is by drop stamping, it is attached to the heating system that laser prunes in unit or module units carries out this tempering step by using.Heating system includes at least one heating coil, and the part along laser weld junction surface 28 and adjacent to laser weld junction surface 28 of structure member 20 is heated to specific temperature by least one heating coil described.Molding control mechanism can also be used to control the geometry of transition region 26 during heating steps.Additionally, be provided with the monitoring for the temperature of control transition region 26 during heating steps or thermal imaging system.However, it is possible to use the structure member 20 adjacent to junction surface 28 is such as heated by laser and is formed transition region 26 by another technology or other equipment.
After tempering step, the ductility of transition region 26 is more than the ductility of the part outside transition region 26 of Part I 22, and the ductility of the part outside transition region 26 less than Part II 24.The intensity of transition region 26 can also be different from the intensity of Part I 22 and the part outside transition region 26 of Part II 24.Such as, the intensity of transition region 26 can more than the intensity of the intensity of the part outside transition region 26 of Part II 24 and the part outside transition region 26 less than Part I 22.Intensity and ductility can be constant or can change along the length of Part I 22 and Part II 24.The intensity of transition region 26 and ductility can also be that constant or along transition region 26 length changes continuously.Such as, the intensity of transition region 26 can reduce continuously along the direction shifting to Part II 24 from Part I 22, and ductility can increase continuously along the direction shifting to Part II 24 from Part I 22.
The method of the present invention requires only transition region 26 to be carried out tempering or heating, and this transition region 26 is less for the tempered region of the drop stamping parts compared, and it is thus desirable to less capital investment.The size of transition region 26 can also change.In one embodiment, at least the 50% of the volume of Part I 22 has the first ductility, and at least the 50% of the volume of Part II 24 has the second ductility.Generally, transition region 26 generally comprises the relatively small part of the volume of Part I 22 and/or the relatively small part of the volume of Part II 24.
The area of transition region 26 can also be easily adjusted.For example, it is possible to regulate described area by simply changing the induction coil of heating system, rather than in the tempering method of prior art mould is carried out big amendment.The thickness of transition region 26 can also change, but generally the thickness of transition region 26 is approximately equal to the thickness of the adjacent part of Part I 22 and is approximately equal to the thickness of adjacent part of Part II 24.
In the exemplary embodiment, the micro structure of transition region 26 includes the mixture of ferrite and martensite.The part being arranged in Part I 22 of transition region 26 includes more martensite than the part being arranged in Part II 24 of transition region 26.Therefore, the intensity of transition region 26 reduces on the direction shifting to Part II 24 from Part I 22 continuously along the length of transition region 26 and the ductility of transition region 26 increases on the direction shifting to Part II 24 from Part I 22 continuously along the length of transition region 26.In the exemplary embodiment, use is worked asBlank 30 HeDuring blank 32, the ultimate tensile strength (UTS) of transition region 26 can be 700Mpa to Isosorbide-5-Nitrae 00Mpa, and the yield strength (YS) of transition region 26 can be 470Mpa to 1,000Mpa, and the elongation percentage (e of transition region 26f) can be at least 6% at least 17% (L0=80mm and th < 3mm).But, introduced transition region 26 can have other characteristics according to the specific material adopted and heating steps.
Many remodeling and modification according to the teachings above present invention are possible, and many remodeling of the present invention and modification can be implemented in other modes except mode as specifically described within the scope of the appended claims.
Claims (15)
1. a structure member, including:
Part I, described Part I is formed by first Steel material with the first ductility；
Part II, described Part II is formed by second Steel material with the second ductility, and described second ductility is more than described first ductility；
Described Part I and described Part II have junction surface between described Part I and described Part II；And
Transition region, described transition region is arranged adjacent to described junction surface, described transition region includes the part adjacent to described junction surface of described Part I and/or the part adjacent to described junction surface of described Part II, and described transition region has the 3rd ductility between described first ductility and described second ductility.
2. structure member according to claim 1, wherein, described first Steel material has the first intensity, and described second Steel material has the second intensity less than described first intensity, and described transition region has the 3rd intensity between described first intensity and described second intensity.
3. structure member according to claim 1, wherein, described 3rd intensity of described transition region includes the ultimate tensile strength (UTS) of 700Mpa to Isosorbide-5-Nitrae 00Mpa and the yield strength (YS) of 470Mpa to 1,000Mpa；And described 3rd ductility of described transition region is by the elongation percentage (e being at least 6%f) provide.
4. structure member according to claim 1, wherein, described transition region includes the mixture of ferrite and martensite, and described Part I includes more martensite than described transition region, and described Part II includes less martensite than described transition region.
5. structure member according to claim 1, wherein, described Part I has the first volume and described Part II has the second volume；At least the 50% of described first volume has described first ductility less than described 3rd ductility；And at least the 50% of described second volume has described second ductility more than described 3rd ductility.
6. structure member according to claim 1, wherein, described Part I is laser welded to described Part II to form described junction surface, and described transition region is tempered.
7. structure member according to claim 1, wherein, the amount that the described Steel material of described Part I comprises the gross weight based on described Steel material be not more than 0.25 percentage by weight (wt.%) carbon, amount for be not more than 1.4wt.% manganese, amount for be not more than 0.35wt.% silicon, amount for be not more than 0.3wt.% chromium, amount for be not more than the boron of 0.005wt.% and the ferrum of surplus.
8. structure member according to claim 1, wherein, described structure member is the B post for motor vehicles, described B post extends longitudinally to the second end from first end, described Part I extends to described junction surface from described first end, and described Part II extends to described the second end from described junction surface.
9. the method manufacturing structure member, including:
The Part I formed by the first Steel material and the Part II formed by the second Steel material are provided, described Part I and described Part II have junction surface between described Part I and described Part II, wherein, described first Steel material has the first ductility and described second Steel material has the second ductility, and described second ductility is more than described first ductility；And
Being heated being formed transition region to the part adjacent to described junction surface of described Part I and/or the part adjacent to described junction surface of described Part II, described transition region has the 3rd ductility between described first ductility and described second ductility.
10. method according to claim 9, wherein, described first Steel material has the first intensity, described second Steel material has the second intensity less than described first intensity, and heating steps includes making described transition region be formed as having the 3rd intensity between described first intensity and described second intensity.
11. method according to claim 9, wherein, heating steps includes carrying out tempering by sensing heating.
12. method according to claim 11, including making multiple described fitting-up, wherein, the plurality of structure member each includes the described transition region formed by described heating steps, and described method includes during described heating steps by using different induction coils to make at least two parts in described parts be formed as the transition region including having different area.
13. method according to claim 9, between described Part I and described Part II, form described junction surface including by laser weld.
14. method according to claim 9, wherein, it is provided that the step of described Part I and described Part II includes making the first blank and the thermoforming in thermal forming device of the second blank；And wherein, described heating steps carries out outside described thermal forming device.
15. method according to claim 14, wherein, described heating steps is pruned in unit at laser and is carried out.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201361908379P | 2013-11-25 | 2013-11-25 | |
| US61/908,379 | 2013-11-25 | ||
| PCT/US2014/065985 WO2015077185A1 (en) | 2013-11-25 | 2014-11-17 | Structural component including a tempered transition zone |
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| Publication Number | Publication Date |
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| CN105792979A true CN105792979A (en) | 2016-07-20 |
| CN105792979B CN105792979B (en) | 2018-10-19 |
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| CN201480063379.9A Active CN105792979B (en) | 2013-11-25 | 2014-11-17 | Include the structure member of tempered transition region |
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| CN112589271A (en) * | 2020-11-10 | 2021-04-02 | 东风汽车集团有限公司 | Laser tailor-welded blank, tailor-welded stamped workpiece and laser tailor-welding method |
| CN112589271B (en) * | 2020-11-10 | 2022-01-11 | 东风汽车集团有限公司 | Laser tailor-welded blank, tailor-welded stamped workpiece and laser tailor-welding method |
| CN115071835A (en) * | 2022-07-19 | 2022-09-20 | 岚图汽车科技有限公司 | Thermoforming laser tailor-welded integral door ring and vehicle |
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