CN105792979B - Include the structure member of tempered transition region - Google Patents
Include the structure member of tempered transition region Download PDFInfo
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- CN105792979B CN105792979B CN201480063379.9A CN201480063379A CN105792979B CN 105792979 B CN105792979 B CN 105792979B CN 201480063379 A CN201480063379 A CN 201480063379A CN 105792979 B CN105792979 B CN 105792979B
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- transition region
- ductility
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- structure member
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Abstract
The present invention provides the structure members (20) through drop stamping for motor vehicles, such as B columns, the structure member includes the first part (22) formed by high strength steel material, which is bonded to the second part (24) formed by high ductibility Steel material.Structure member (20) further includes along the transition region (26) through localized tempering of joint portion (28) to reduce the possibility to fail along joint portion (28).The strength level and ductility level of transition region (26) are between the strength level and ductility level of the remainder of first part (22) and the strength level and ductility level of the remainder of second part (24).Tempering step can be incorporated into laser trimming unit or module units, and therefore can establish transition region (26) in the case where not adding additional procedure of processing or increasing circulation time.
Description
Cross reference to related applications
This PCT Patent Application is required in " Structural Component submitting, entitled on November 17th, 2014
Including A Tempered Transition Zone (structure member for including tempered transition region) ", Serial No.
The equity of 14/543,482 U.S. Patent application, the U.S. Patent application are required in submit, title on November 25th, 2013
For " Structural Component Including A Tempered Transition Zone (including tempered transition
The structure member in area) ", the equity of the U.S. Provisional Patent Application of Serial No. 61/908,379, the entire disclosure of these applications
Content is considered as a part for present disclosure and is incorporated herein herein by reference.
Technical field
The present invention generally relates to the thermoformed structure component of motor vehicles and manufacture these thermoformed structure components
Method.
Background technology
Structure member such as beam, column and guide rail for motor vehicles generally include firstth area with high intensity and have
Secondth area of high ductibility.There are the processes for realizing these areas with some strength.These processes may include
The not same district of single parts is heated or cooled to different temperature and/or with different rates to single in molding die
The not same district of parts is heated or cooled.
Include the structure member in the area with varying strength and ductility by using welded steel billet to come in fact
It is existing.The technology includes that the first blank formed by high-strength material is soldered to the second blank formed by high ductility material,
And then make welded blank thermoforming to provide structure member.In other companies, ArcelorMittal (find pleasure in by Ansai
Meter Ta Er) company has been developed that two kinds of materials for manufacturing the welded structure member in motor vehicles, for
For the case where ArcelorMittal, both materials include known and conductSale with high intensity
Component and known and conductThe component with high ductibility of sale.
Invention content
The present invention provides a kind of structure member, which includes the first part and second that each free Steel material is formed
Part, and the first part and the second part have the joint portion being disposed between.First part has the first ductility,
And there is second part the second ductility, the second ductility to be more than the first ductility.In first part adjacent to joint portion
A part and/or second part the part adjacent to joint portion in be formed with transition region.The transition region has between the
Third ductility between one ductility and the second ductility.
The present invention also provides the methods that manufacture includes the structure member of transition region.This method include provide first part and
Second part, first part and second part have the joint portion being disposed between, wherein second part, which has, is more than first
Second ductility of the first ductility divided.This method further include to first part adjacent to the part at joint portion and/or
The part adjacent to joint portion of second part is heated to form the transition region with third ductility, and wherein third is prolonged
Malleability is between the first ductility and the second ductility.
Energy absorption is realized in impact adjacent to the ductility of the transition region at joint portion, may be not present along joint portion
Separation or rupture.Therefore, when structure member is used in motor vehicles, transition region reduces during collision along engagement
The possibility of portion's failure.Other than providing and contributing to the tempering characteristics of energy absorption and vehicle collision strategy, carried by the present invention
The structure member and method of confession can use existing material, for example useFor high intensity first part with
And it usesSecond part for high ductibility.
Furthermore it is possible to by using relatively inexpensive induction heating system --- such as laser trimming unit or module units
In induction heating system --- form the local transition region of structure member by being tempered.It therefore, there is no need to indirectly process
Form transition region, out of without such as mould drawing process (in-die tempering process) it is commonly required want be used for
The extra cost or relevant quality control cost of tool and its maintenance.Transition is formed in laser trims unit or module units
Area additionally provides reduced procedure of processing and circulation time.Since the method for the present invention does not have the tempering method of the prior art multiple
It is miscellaneous, so needing less capital investment.Furthermore, it is possible to be adjusted by simply changing the induction coil in post-processing unit
The size of transition region, rather than big modification is carried out to mold as in the tempering method of the prior art.
Description of the drawings
When considered in conjunction with the accompanying drawings, by referring to described in detail below, the present invention becomes better understood, while the present invention
Other advantages are readily able to be appreciated, in the accompanying drawings：
Fig. 1 illustrates the structure member illustratively through drop stamping, which includes being formed by high-strength material
First part, which is soldered to the second part formed by high ductility material, and the structure member includes adjacent
In the transition region of welded joint；And
Fig. 2 illustrates the first blank for being soldered to the second blank, and first blank and second blank are used to form Fig. 1's
Structure member.
Specific implementation mode
The present invention provides the structure member 20 through thermoforming for motor vehicles, such as B columns, the structure member 20 packets
The first part 22 with high intensity is included, which is bonded to the second part 24 with high ductibility, and this hair
It is bright to provide the method for manufacturing structure member 20 as shown in Figure 1.Transition region 26 through localized tempering is along structure member 20
Extend adjacent to the region at joint portion 28.Transition region 26 generally include first part 22 adjacent to joint portion 28, for example small
In 50% part of the volume of first part 22.Transition region 26 can further include second part 24 adjacent to joint portion 28
, 50% part of volume that be, for example, less than second part 24.The ductility level of transition region 26 is between first part 22
Adjacent part ductility is horizontal between the ductility level of the adjacent part of second part 24.The intensity of transition region 26 is also
It can be different from the intensity of the intensity of the adjacent part of first part 22 and the adjacent part of second part 24.In exemplary implementation
In mode, structure member 20 is efficiently manufactured in the following way：To sheet steel blank shown in Fig. 2 --- for example30 He of blankBlank 32 --- carry out drop stamping, and then to through drop stamping part 22,
24 part adjacent to joint portion 28 is tempered to provide transition region 26, as shown in fig. 1.Transition region 26 provides machine
Controlled tempering characteristics in dynamic vehicle part.For example, the ductility of transition region 26 helps to carry out energy during impact
It absorbs and reduces the possibility for rupturing or detaching along joint portion 28.
The first blank 30 for being used to form the first part 22 of the high intensity of structure member 20 includes being referred to as the first steel
The Steel material of material.However, it is possible to use a variety of different steel alloys, in the exemplary embodiment, the first blank 30 include warp
Steel alloy is hardened in the compacting of coating, such as1500P.This steel alloy includes the weight hundred measured as no more than 0.25
Carbon, amount point than (wt.%) for no more than 1.4wt.% manganese, amount for no more than 0.35wt.% silicon, amount for no more than
The chromium of 0.3wt.%, the iron that amount is boron and surplus no more than 0.005wt.%.Before thermoforming, illustrative embodiments
The first blank 30 have include ferrite and pearlite micro-structure.The first blank 30 also pole with 500Mpa to 700Mpa
Limit tensile strength (UTS), 350Mpa to 550Mpa yield strength (YS) and at least 10% elongation percentage (ef)(L0=80mm
And th<3mm).
The geometry of first blank 30 can change according to the type of structure member 20 to be formed.In general, first
Blank 30 includes first end 34, which extends longitudinally into the second end 36.In the exemplary embodiment,
One blank 30 is designed to act as the B columns of motor vehicles and therefore includes being located at foot part at first end 34 and from foot part
Longitudinal section of the second end 36 is extended to, as shown in Figure 2.However, the geometry of the first blank 30 can be alternatively
It is designed to provide another type of column, track, beam, reinforcer, ring, frame or the body part for motor vehicles.First base
Material 30 is also designed to be used for non power driven vehicle application.The thickness of first blank 30 can be uniform or can be along the first base
The length variation of material 30.The thickness is usually 1mm for motor vehicles application to 2mm, and in illustrative embodiments
In, 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 during thermoforming process and prevent
Crack in Steel material.In the exemplary embodiment, coating includes the aluminium that amount is 90wt.% and the silicon that amount is 10wt.%.So
And other kinds of coating can be used, such as spelter coating.Coating is being applied to the first blank 30 that thickness is 1mm to 2mm
Shi Tongchang has 25 μm of average thickness.
The second blank 32 of the second part 24 of the high ductibility of structure member 20 is used to form also by being referred to as the second steel
The Steel material of material is formed.Second Steel material can also include various types of Steel material.In the exemplary embodiment,
Second Steel material 32 hardens steel alloy including uncoated compacting, such as500P。
The geometry of second blank 32 can change according to the type of structure member 20 to be formed.However, second
Blank 32 generally includes first end 35, which extends longitudinally into the second end 37.In illustrative embodiments
In, wherein the second blank 32 is designed to use in B columns, which includes extending to second end from first end 35
Longitudinal section in portion 37 and the foot part at the second end 37, as shown in Figure 2.In this embodiment, second
The width for dividing the width of 24 first end 35 to be approximately equal to the second end 36 of first part 22.Alternatively, the second blank
32 geometry can be designed to provide for the another type of columns of motor vehicles, track, beam, reinforcer, ring, frame or
Body part.Second blank 32 is also designed to the application for non power driven vehicle.The thickness of second blank 32 can be equal
It is even or can change along the length of the second blank 32.However, the thickness for motor vehicles application for be usually 1mm extremely
2mm.In the exemplary embodiment, the thickness of the second blank 32 is 1.5mm.
The method of manufacture structure member 20 generally includes the first blank 30 being bonded to the second blank 32 to form joint portion
28.In the exemplary embodiment, the second end 36 of the first blank 30 is laser welded to the first end of the second blank 32
35 to form joint portion 28 (that is, weld part), as shown in Figure 2.However, it is possible to use the joining technique of various other types,
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 has institute to provide
Need the structure member 20 of shape.A variety of different thermoforming processes can be used.In the exemplary embodiment, the thermoforming
Journey is included in after blank 30,32 is joined together carries out drop stamping to the first blank 30 and the second blank 32.Illustratively
Hot stamping operation includes first：Welded blank 30,32 is heated to 900 DEG C to 950 DEG C of 5 to 10 points of temperature in stove
Clock.During the step, the Steel material of the first blank 30 and the second blank 32 is changed into austenite microstructure.Next, example
Property process includes that heated blank 30,32 is transferred to molding die, wherein the transfer time from stove to molding die is preferred
Ground is less than 7 seconds.This method is right in a mold while being next included in blank 30,32 still in 600 DEG C to 800 DEG C of temperature
Heated blank 30,32 carries out punching press.The mold makes heated blank 30,32 be shaped to first with predetermined shape
Divide 22 and second part 24.It is closed after the punching step and still in mold and part 22,24 is still located in mold
Meanwhile illustrative methods include to carry out quenching to first part 22 more than 50 DEG C of speed per second and to be more than 30 DEG C per second
Speed second part 24 is quenched.Quenching Step can include alternatively carrying out water quenching with higher speed.
During quenching Step, the micro-structure of first part 22 is changed into martensite from austenite, and the micro-structure of second part 24 from
Austenite is changed into the mixture of ferrite and martensite.As stated, which is only carried as example
For, and various other hot stamping operations or thermoforming process can be used.
After thermoforming process, the intensity of first part 22 is still greater than the intensity of second part 24, and second part
Ductility of 24 ductility still greater than first part 22.Here, during the process, in entire first part 22, intensity
It is typically uniform with ductility, and in entire second part 24, intensity and ductility are typically uniform.Exemplary
In embodiment, wherein first part 22 by1500P is formed, and first part 22 has Isosorbide-5-Nitrae 00Mpa to 1,
The ultimate tensile strength (UTS) of 600Mpa, the yield strength (YS) of 1,000Mpa to 1,200Mpa, at least 5% to 6% extension
Rate (ef)(L0=80mm and th<3mm) and the hardness less than 490.The second part 24 of illustrative embodiments --- it should
Second part 24 by500P is formed --- with 550Mpa to 700Mpa ultimate tensile strength (UTS),
The yield strength (YS) of 370Mpa to 470Mpa and at least 17% elongation percentage (ef)(L0=80mm and th<3mm).So
And the characteristic of first part 22 and second part 24 can be different from the example.
Manufacture structure member 20 method further include to first part 22 along joint portion and adjacent to joint portion extremely
A few region and/or second part 24 are heated along joint portion and adjacent at least one region at joint portion with shape
At transition region 26.For example, transition region 26 can be only located in first part 22, be only located in second part 24 or be located at first
In the part of 24 the two of part 22 and second part.After drop stamping step, the heating stepses are carried out outside molding die,
And the heating stepses preferably carry out in laser trims unit or module units.Alternatively, which can make
It is provided for secondary process.The heating stepses for being used to form transition region 26 may include tempering, annealing or any other type
Heat treatment.It is introduced into the ductility of the ductility level of the transition region 26 in structure member 20 between the adjacent part of first part 22
Between the ductility level of horizontal and second part 24 adjacent part, to absorb energy during collision.Transition region 26 it is strong
Degree is horizontal can also be between the intensity water of the adjacent part of the strength level and second part 24 of the adjacent part of first part 22
It is between flat or different from the strength level of the strength level of the adjacent part of first part 22 and the adjacent part of second part 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) determines.The time of heating stepses and temperature will become according to the Steel material and thickness of blank 30,32
Change.In addition, time and temperature can be conditioned to meet the required tempering characteristics for each specific application.
In an exemplary embodiment, the step of introducing transition region 26 includes to first part 22 adjacent to Laser Welding
The part for connecing joint portion 28 carries out locally tempering and to second part 24 adjacent to the one of laser welding joint portion 28
Part is locally tempered.The tempered part of first part 22 is positioned adjacent to the second end 36 of first part 22,
And the tempered part of second part 24 is positioned adjacent to the first end 35 of second part 24, as shown in fig. 1.In base
Material 30,32 by after drop stamping, by using the induction heating system being attached in laser trimming unit or module units come into
The row tempering step.Induction heating system includes at least one heating coil, and at least one heating coil is by structure member
20 along laser welding joint portion 28 and adjacent to the part at laser welding joint portion 28 are heated to specific temperature.May be used also
To use molding control mechanism to control the geometry of transition region 26 during heating stepses.In addition, being provided with for adding
Monitoring or the thermal imaging system of the temperature of transition region 26 are controlled during hot step.However, it is possible to use another technology or other set
Standby --- for example passing through laser --- adjacent to the structure member 20 at joint portion 28 to being heated and forming transition region 26.
After tempering step, the ductility of transition region 26 is more than prolonging for the part outside transition region 26 of first part 22
Malleability, and the ductility of the part outside transition region 26 less than second part 24.The intensity of transition region 26 can also be with
A part 22 is different with the intensity of the part outside transition region 26 of second part 24.For example, the intensity of transition region 26 can be big
Intensity in the part outside transition region 26 of second part 24 and the part outside transition region 26 less than first part 22
Intensity.Intensity and ductility can be constant or can change along the length of first part 22 and second part 24.It crosses
It crosses the intensity in area 26 and ductility can also be constant or continuously change along the length of transition region 26.For example, transition region
26 intensity can continuously reduce along the direction for shifting to second part 24 from first part 22, and ductility can be along from
The direction that a part 22 shifts to second part 24 continuously increases.
The method of the present invention requires that only transition region 26 is tempered or is heated, and the transition region 26 is relative to the heat punching compared
It is smaller for the tempered region of splenium part, and therefore needs less capital investment.The size of transition region 26 is also
It can change.In one embodiment, at least the 50% of the volume of first part 22 has the first ductility, and second
Divide at least the 50% of 24 volume there is the second ductility.In general, transition region 26 generally comprise the volume of first part 22 compared with
The fewer parts of small part and/or the volume of second part 24.
The area of transition region 26 can also be easily adjusted.For example, can be by simply changing the sense of heating system
Coil is answered to adjust the area, rather than carries out big modification to mold as in the tempering method of the prior art.Transition
The thickness in area 26 can also change, but the thickness of usually transition region 26 is approximately equal to the thickness of the adjacent part of first part 22 simultaneously
It is approximately equal to the thickness of the adjacent part of second part 24.
In the exemplary embodiment, the micro-structure of transition region 26 includes the mixture of ferrite and martensite.Transition region
26 part being located in first part 22 includes more martensites than the part of transition region 26 being located in second part 24.
Therefore, the intensity of transition region 26 along the length of transition region 26 continuous from the direction that first part 22 shifts to second part 24
The ductility of ground reduction and transition region 26 is along the length of transition region 26 in the side for shifting to second part 24 from first part 22
Continuously increase upwards.In the exemplary embodiment, work as use30 He of blankWhen 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 with
For 470Mpa to 1, the 000Mpa and elongation percentage (e of transition region 26f) can be at least 6% at least 17% (L0=80mm is simultaneously
And th<3mm).However, introduced transition region 26 can have other according to used specific material and heating stepses
Characteristic.
It is possible according to many remodeling of the teachings above present invention and modification, and many remodeling of the present invention and modification
Other modes other than in a manner of as specifically described it can implement within the scope of the appended claims.
Claims (15)
1. a kind of structure member, including：
First part, the first part are formed by the first Steel material with the first ductility；
Second part, the second part are formed by the second Steel material with the second ductility, and second ductility is more than
First ductility；
The first part is soldered directly to the second part and has between the first part and the second part
Joint portion；And
Transition region, the transition region arrange that the transition region is by the first part adjacent to institute adjacent to the joint portion
The part adjacent to the joint portion of a part and/or the second part for stating joint portion is constituted, the transition region tool
There is the third ductility between first ductility and second ductility, and transition region offer contributes to
The tempering characteristics of energy absorption are carried out during impact.
2. structure member according to claim 1, wherein first Steel material has the first intensity, second steel
Material has the second intensity less than first intensity, and the transition region has between first intensity and described the
Third intensity between two intensity.
3. structure member according to claim 2, wherein the third intensity of the transition region includes 700Mpa to 1,
The ultimate tensile strength (UTS) of 400Mpa and the yield strength (YS) of 470Mpa to 1,000Mpa；And the institute of the transition region
State third ductility by be at least 6% elongation percentage (ef) provide.
4. structure member according to claim 1, wherein the transition region includes the mixture of ferrite and martensite,
The first part includes more martensites than the transition region, and the second part includes less than the transition region
Martensite.
5. structure member according to claim 1, wherein the first part has the first volume and second described
Dividing has the second volume；At least the 50% of first volume has first ductility less than the third ductility；
And at least the 50% of second volume has second ductility more than the third ductility.
6. structure member according to claim 1, wherein the first part be laser welded to the second part with
The joint portion is formed, and the transition region is tempered.
7. structure member according to claim 1, wherein the Steel material of the first part includes to be based on the steel
The amount of the total weight of material is carbon no more than 0.25 weight percent (wt.%), amount is for the manganese no more than 1.4wt.%, amount
Silicon no more than 0.35wt.%, amount are the boron and surplus no more than 0.005wt.% for the chromium no more than 0.3wt.%, amount
Iron.
8. structure member according to claim 1, wherein the structure member is the B columns for motor vehicles, the B
Column extends longitudinally to the second end from first end, and the first part extends to the joint portion from the first end,
And the second part extends to the second end from the joint portion.
9. a kind of method of manufacture structure member, including：
The first part formed by the first Steel material and the second part formed by the second Steel material are provided, by the first part
It is soldered directly to the second part and there is joint portion between the first part and the second part, wherein is described
First Steel material is with the first ductility and second Steel material is with the second ductility, and second ductility is more than institute
State the first ductility；And
To the first part adjacent to the joint portion a part and/or the second part adjacent to the engagement
The part in portion is heated to form transition region, and the transition region has to extend between first ductility and described second
Property between third ductility, and the transition region provide contribute to during impact carry out energy absorption tempering characteristics.
10. according to the method described in claim 9, wherein, first Steel material has the first intensity, second Steel material
With the second intensity less than first intensity, and heating stepses include that the transition region is made to be formed to have between described
Third intensity between first intensity and second intensity.
11. according to the method described in claim 9, wherein, heating stepses include being tempered by sensing heating.
12. according to the method for claim 11, including making multiple fitting-ups, wherein multiple structures
Component includes respectively the transition region formed by the heating stepses, and the method includes in the heating stepses
Period makes at least two components in the component be formed as including with different area by using different induction coils
Transition region.
13. according to the method described in claim 9, including by laser welding the first part and the second part it
Between form the joint portion.
14. according to the method described in claim 9, wherein, the step of providing the first part and the second part, includes
Make the thermoforming in thermal forming device of the first blank and the second blank；And wherein, the heating stepses are set in the thermoforming
Standby outer progress.
15. according to the method for claim 14, wherein the heating stepses carry out in laser trims unit.
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105792979A CN105792979A (en) | 2016-07-20 |
| CN105792979B true CN105792979B (en) | 2018-10-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480063379.9A Active CN105792979B (en) | 2013-11-25 | 2014-11-17 | Include the structure member of tempered transition region |
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| Country | Link |
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| CN (1) | CN105792979B (en) |
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|---|---|---|---|---|
| DE102016114062B3 (en) * | 2016-07-29 | 2017-06-22 | Benteler Automobiltechnik Gmbh | Pillar for a motor vehicle and method for producing a pillar |
| KR101836291B1 (en) | 2016-09-01 | 2018-03-08 | 기아자동차 주식회사 | Size correction apparatus and method for hot stamping part |
| US20180094332A1 (en) * | 2016-10-05 | 2018-04-05 | Ford Global Technologies, Llc | Method of manufacturing different versions of a pillar reinforcement with a common mold |
| CN107792195B (en) * | 2017-09-29 | 2021-03-02 | 奇瑞汽车股份有限公司 | Sectional type B column inner plate structure and welding method thereof |
| WO2019122978A1 (en) * | 2017-12-21 | 2019-06-27 | Arcelormittal | Welded steel part used as motor vehicle part, hot pressed steel part, and method of manufacturing said welded steel part |
| WO2019171150A1 (en) * | 2018-03-08 | 2019-09-12 | Arcelormittal | Method for producing a welded metal blank and thus obtained welded metal blank |
| EP3877554A4 (en) * | 2018-11-05 | 2022-06-22 | Magna International Inc | Localized resistance annealing process |
| CN113025876A (en) | 2019-12-24 | 2021-06-25 | 通用汽车环球科技运作有限责任公司 | High performance press hardened steel component |
| 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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| US8382197B2 (en) * | 2006-12-08 | 2013-02-26 | GM Global Technology Operations LLC | Composite made of two steel plates |
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| US7562807B2 (en) * | 2004-05-05 | 2009-07-21 | Electric Power Research Institute | Weld filler for welding dissimilar alloy steels and method of using same |
| US8382197B2 (en) * | 2006-12-08 | 2013-02-26 | GM Global Technology Operations LLC | Composite made of two steel plates |
| CN102409153A (en) * | 2011-11-14 | 2012-04-11 | 苏州热工研究院有限公司 | Postweld heat treatment method of welded joint of pipelines with different specifications |
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| CN105792979A (en) | 2016-07-20 |
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