• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method for manufacturing a custom welded blank and hot stamped component disclosed is a custom welded blank and a manufacturing method thereof. The custom welded blank is fabricated connected to the raw elements of different materials or thickness, thus eliminating quality problems in a welded zone. a hot stamped component is fabricated by hot stamping the custom welded blank formed by raw laser welding elements made of coated steel plates having different strengths or thicknesses using a filler cable, wherein a laser welded zone has a martensitic structure.
    公开号:BR112013028391B1
    申请号:R112013028391-2
    申请日:2013-05-28
    公开日:2019-04-24
    发明作者:Min-Suck Kwon；Yun-Gyu Kim；Young-Jin Kim；Chung-Yun KANG；Jong-Pan Kong；Myeong-Hwan Oh；Hyeon-Jeong Shin；Seung-Taik Oh
    申请人:Hyundai Steel Company；
    IPC主号:
    专利说明:

    METHOD FOR MANUFACTURING A CUSTOM WELDED PIECE AND HOT PRINTED COMPONENT
    TECHNICAL FIELD
    The present invention relates to a made-to-measure blank 5 which is manufactured by connecting blank parts of different materials or thicknesses, a method of manufacturing this, and a component of the hot stamped part using the custom-welded blank . More particularly, the present invention relates to a custom-welded blank capable of preventing quality problems from occurring in a welded zone, a manufacturing method thereof, and a hot-stamped component using the custom-welded blank .
    HISTORY OF THE INVENTION
    The respective parts of a vehicle employ several components having different resistances according to the functions of the vehicle. For example, a part of the vehicle for impact absorption on the collision may employ components having relatively low strength, and the part of the vehicle necessary to maintain its shape to ensure a survival space for occupants can employ components having relatively high strength.
    When a shock-absorbing part of a vehicle has high strength, the shock-absorbing part transfers the impact to other parts instead of adequately absorbing the impact in the collision, whereby occupants and other parts of the vehicle can be exposed to excessive impact.
    In order to meet the continuous demand for cost and weight reduction in the vehicle field, a single component is required to have different resistances according to the sections of this field.
    That is, some sections of a component are
    Petition 870190004953, of 1/16/2019, p. 6/12
    2/13 needed to have relatively high strength for protection of occupants, and other sections of it are needed to have relatively low strength for impact absorption.
    An example of this component includes a vehicle B column.
    Figure 1 is an enlarged perspective view of a chassis and a B column of a vehicle.
    In a given car, a column Β 1 is arranged between a front door and a rear door and connects a bottom surface of a chassis to a roof.
    In column B 1, an upper part la is required to have a higher tensile strength than a lower part lb of it. The reason for the provision of differences in resistance according to the sections in column B provided as a unitary component is because there are two sections in the unitary component, that is, a structural section (for example, an upper part needed to support a roof of the vehicle when the vehicle turns) that needs to maintain its shape in the collision and a shock absorbing section (for example, a lower part having a high possibility of side collision with other vehicles) that needs to be crushed to absorb the shock.
    That is, the upper part of the column Β 1 needs high strength, as it needs to maintain its shape in the vehicle collision to hold a safe space to prevent injury to the occupant, where the lower part lb of the column Β 1 needs relatively resistance low, as it needs to be deformed to absorb the impact of the vehicle collision. If the lower part lb of the column Β 1 has high strength as in the upper part la, the lower part lb of the column Β 1 cannot absorb the impact in the side collision, whereby the impact can be transferred to other structural members.
    3/13
    Although the detailed strength may vary according to vehicle types or shapes, the upper part of column B 1 needs a tensile strength of approximately 1500 MPa, and the lower part of column B 1 needs a tensile strength of approximately 500 to 1,000 MPa.
    In the related art, a component is first made of a low strength material and a separate reinforcement material is fixed in a section necessary to have high strength. Also, when a unitary component is necessary to have different strengths according to the sections, a material having high hardenability (or a thick material) and a low resistance material having low hardenability (or a thin material) are laser welded to form a blank, followed by the formation of a final product through hot stamping.
    A blank manufactured by laser welding components of different materials (or thicknesses) is referred to as a custom-welded blank, which can also be manufactured using a coated steel plate.
    When the coated steel plate is laser welded, a material composition of a coating layer is melted and enters a melting tank of a welded zone, whereby the welded zone has different physical properties than a base material thereof.
    For example, when the coating layer is an Al-Si or Zn-based layer, the coating components can enter the welded zone in laser welding, thus causing deterioration in the physical properties of the welded zone.
    In the related technique, laser welding is performed after removing a coating layer from a section to be subjected to laser welding, thus preventing
    4/13 the coating components introduce to the welded area. However, this method causes an increase in manufacturing costs due to the addition of a coating layer removal process.
    An example of a prior art is disclosed in Korean Patent Publication No. 10-2QQ9-0005Q04A (published on January 12, 2009), entitled Method for making a weld component with high mechanical characteristics of a coated lamination plate.
    REVELATION
    TECHNICAL PROBLEM
    It is an aspect of the present invention to provide a custom-welded blank having excellent quality in a welded zone without removing a coating layer from the welded zone, and a method of manufacturing it.
    It is another aspect of the present invention to provide a hot stamped component using the custom welded blank, in which the welded area has a martensitic structure after hot stamping.
    TECHNICAL SOLUTION
    According to one aspect, the present invention provides a method for making a custom-welded blank, which includes: laser-welded blank elements made of coated steel plates having different strengths or thicknesses using the filler cable.
    The filler cable may have a composition, in which a welded zone does not generate a ferrite structure at temperatures ranging from 800 ° C to 950 ° C, considering the intrusion of a coating layer composition of the coated steel plates to the welded area .
    The coated steel plate may include an Al-Si coating layer, and the filler cable may have a higher amount of a stabilizing element per
    5/13 austenite than a base material for each of the coated steel plates. Here, the austenite stabilizing element can include C or Mn.
    C content of the filler cable can be 0.1% by weight (% by weight) to 0.8% by weight higher than that of the base material of the coated steel plate, and the Mn content of the filler cable can be 1 , 5 wt% to 7.0 wt% higher than the base material of the coated steel plate.
    According to another aspect, the present invention provides a custom welded blank manufactured by laser welding blank made of coated steel plates having different strengths or thicknesses, using a filler cable, in which a laser welded area has a composition providing an austenite structure at temperatures ranging from 800 ° C to 950 ° C.
    The welded zone can have a composition in which a base material and a coating layer of each of the coated steel plates are mixed with the filler cable.
    According to another aspect, the present invention provides a hot-stamped component manufactured by hot stamping a blank welded into a blank formed by laser welding blank made from coated steel plates having different strengths or thicknesses using the cable filler, in which a laser welded area has a martensitic structure.
    Each of the crude elements may include a boron steel plate for hardening as a base material and a coating layer of Al-Si or Zn, and the filler cable may have a higher amount of an austenite stabilizing element than the material base of the coated steel plate. Here, the austenite stabilizing element can include C or Mn.
    6/13
    ADVANTAGE EFFECTS
    According to the present invention, a custom-welded blank is manufactured using a filler cable that is designed to prevent a molten coating layer from entering into a welded zone of the blank, so that the welded zone has a structure complete martensitic after hot stamping.
    Thus, in manufacturing the welded blank by measure, the removal and coating of the coating layer is not necessary, thus achieving cost reduction and improved productivity.
    DESCRIPTION OF THE DRAWINGS
    The above and other aspects, functions and advantages of the present invention will become evident from the detailed description of the following achievements with the accompanying drawings, in which:
    Figure 1 is a schematic view of a column B and a chassis structure of a vehicle;
    Figure 2 shows a microstructure of a welded zone, formed by laser welding without removing an Al-Si coating layer and a graph describing the stiffness distribution of the welded zone before and after hot stamping;
    Figure 3 is a diagram of a method for manufacturing a welded blank according to an embodiment of the present invention; and
    Figure 4 is a graph that describes the change of a transformation curve according to the increase in a quantity of a stabilizing element by austenite.
    ♦ Detailed description of the Main Elements *
    10, 20: blank
    12, 22: base materials
    14, 24: coating layers
    7/13: laser beam: filler cable
    BEST MODE
    The embodiments of the invention will now be described in detail with reference to the accompanying drawings.
    It is to be understood that the present invention is not limited to the following embodiments and can be incorporated in different ways, and that the embodiments are given to provide complete disclosure of the invention and to provide a complete understanding of the invention to those skilled in the art. The scope of the invention is defined only by the claims. Similar components will be denoted by similar reference numerals throughout the specification.
    First, a method for making a custom welded blank will be described.
    The present invention relates to a method for manufacturing a welded blank by laser welding blank of different materials or thicknesses, in which the welded blank has different physical properties according to its sections. Specifically, the present invention aims to solve a problem that, when the raw elements are made of coated steel plates, the coating layers of the coated steel plates are melted and introduced into a welded zone in laser welding, thus causing defects in the welded area.
    When the raw elements made from the coated steel plate are laser welded together, the coating layer of the coated steel plate is melted and introduced into the welded area.
    That is, the welded zone has a composition in which a base material is mixed with the coating layer of the coated steel plate, where the welded zone has different
    8/13 physical properties than the base material.
    In particular, when the welded blank is subjected to hot stamping, the intrusion of the coating layer components into the welded zone causes a reduction in the strength of the welded zone.
    For hot stamping, the blank welded by measure is mainly composed of a base material formed from a boron steel plate having hardenability, and an Al-Si coating layer formed on the base material. Thus, the welded zone contains the components of the welded coating layer and has a composition in which the content of Al and Si increases above that of the base material. As a result, after hot stamping, the welded zone has a structure in which martensite and ferrite coexist, rather than the complete martensitic structure. As a result, the welded zone undergoes a reduction in strength due to the coexistence of the ferrite structure and the martensitic structure.
    The present invention is directed to designing a composition of a filler cable considering the intrusion of the coating layer fused to the welded layer during laser welding of the raw elements made from the coated steel plate, and to provide the desired properties to the welded area using the designed filler cable.
    Figure 2 shows a microstructure of a welded zone formed by laser welding without removing an Al-Si coating layer, and graphs describing the stiffness distribution of the welded zone before and after hot stamping.
    As shown, prior to hot stamping (indicated by a blue graphic), a welded zone has higher rigidity than the base material, and a thermally affected zone by welding has the highest rigidity.
    On the other hand, after hot stamping
    9/13 (indicated by a red graph), the stiffness of the base material increases, while the stiffness of the welded area decreases.
    Consequently, after hot stamping, the stiffness (300 to 350 Hv) of the welded zone becomes lower than the stiffness (500 Hv) of the base material.
    Table 1 shows the results of the stress test in which a laser-welded sample having a coating layer is subjected to the stress force in a direction perpendicular to a welding line.
    Table 1
    At the T (mm) YS (MPa) TS (MPa) EL (%) Base metal H / S 1,208 1040 1530 7.1 ZoneSoldier © 1,216 1013 1097 0.7 © 1,203 989 1108 0.5 © 1,194 1018 1176 0.4 bird 1,204 1007 1127 0.5
    As can be seen from the result, the welded zone has both lower yield strength and stress resistance than the base material, and has an elongation of no more than 10% of the elongation of the base material.
    This results from the intrusion of the components (Al or Si) of the coating layer to the welded zone, and thus it can be seen that the welded zone reduces both stiffness and strength after hot stamping, providing a high possibility of failure in the welded zone. in the collision of the vehicle.
    Figure 3 is a diagram of a method for manufacturing a custom welded blank according to an embodiment of the present invention.
    10/13
    As shown, the method includes welding raw elements 10, 20, which include base materials 12, 22 and coating layers 14, 24 formed on the base materials, by a laser beam 30 using a filler cable 40, so that the components of the filler cable 40, base materials 12, 22 and sheath layers 14, 24 coexist in a welded zone.
    According to the present invention, a composition of the filler cable 40 that will be melted and introduced into the welded zone is controlled to regulate a composition of the welded zone, thus allowing the welded zone to have the desired physical properties.
    Each of the base materials 12, 22 may employ a boron steel plate having hardenability, and each of the coating layers 14, 24 may employ an Al-Si or Zn coating layer.
    Considering the intrusion of the coating layers 14, 24 to the welded zone, it is observed that the filler cable 40 has a composition that does not allow a ferrite structure to be formed in the welded zone at temperatures ranging from 900 ° C to 950 ° C.
    That is, the filler cable 40 has a higher amount of an austenite stabilizing element than the base material composition of the coated steel plate so that the welded area can have a complete austenite structure without forming the same ferrite structure. intrusion of the molten coating layer into the welded area.
    Figure 4 is a graph that describes the change of a transformation curve according to the increase in a quantity of a stabilizing element by austenite.
    As shown, as the amount of the austenite stabilizing element (such as C, Mn, etc.) increases, a temperature point Ac3 decreases and the transformation curve
    11/13 changes to the right, thus increasing an austenite loop structure.
    In the present invention, the austenite stabilizing element can include C or Mn.
    When the filler cable includes a higher amount of the austenite stabilizing element than the base material, the welded zone has a complete austenite structure at hot stamping temperatures ranging from 800 ° C to 950 ° C, and in extinction of the welded zone, the complete austenite structure is transformed into the complete martensitic structure.
    In other words, even when the coating layer components are introduced to a molten tank in the welded zone, the welded zone has the complete martensitic structure after hot stamping, as the filler cable contains a large amount of austenite stabilizing element.
    Thus, although the coating layer is not removed and the components of the coating layer introduce it into the welded area, the welded area is prevented from being reduced in rigidity and strength, and thus has similar physical properties to the base material, thus preventing the failure of the zone welded in the collision.
    For prevent the generation of structure of ferrite at welded zone because intrusion from Al at layer in coating, the content of Cable Mn filler is 1.5% in weight at 7.0% by weight more taller than of material basis of steel
    boron.
    If the Mn content is below this range (that is, below 1.5% by weight), the austenite circuit is not greatly expanded, so that the ferrite structure coexists with the austenite structure in the welded zone at temperatures ranging from 800 ° C to 950 ° C. Also, if the Mn content is
    12/13 above this range (that is, above 7.0% by weight), the molten tank reduced the viscosity and an expansion coefficient increases in the transformation from liquid to solid, causing problems in the welded zone, such as deterioration of the quality of the shape, cracks, and the like.
    In addition, the C content of the coating layer can be 0.1 wt% to 0.8 wt% higher than that of the boron steel base material.
    If the C content is lower than this range, the austenite circuit is not greatly expanded, so that the ferrite structure coexists with the austenite structure in the welded zone at temperatures ranging from 800 ° C to 950 'C . Also, if the C content of the coating layer is above this range, the welded zone increases excessively in stiffness and strength, causing problems in the welded zone such as collision failure.
    As a result of the assessment, when SABC1470 steel plates each comprising: 0.22% by weight of C; 0.24% by weight of Si; 1.19% by weight of Mn, 0.0015% by weight of P; 0.0006% by weight of S; and the balance of Fe and unavoidable impurities were welded by laser without using a filler cable, a welded zone subjected to failure in the tension test. Also, when the steel plates were laser-welded, using a filler cable, containing 0.6% by weight of C, the base material of the steel plate is subjected to failure.
    Thus, according to the present invention, raw elements made of coated steel plates having different strengths and thicknesses are laser-welded using a filler cable to provide a custom-welded blank, in which a laser-welded zone has a composition providing an austenite structure at temperatures ranging from 800 'C to 950 ° C. Thus, the welded area of the welded blank does not suffer from a reduction in strength
    13/13 and stiffness even after hot stamping.
    Although some achievements have been described here, it should be understood by those skilled in the art that these achievements are given in the form of illustration only, and that the various modifications, variations and alterations can be made without departing from the spirit and scope of the present invention. Thus, the scope of the present invention should be limited only by the appended and equivalent claims thereof.
    权利要求:
    Claims (5)
    [1]
    1. METHOD FOR MANUFACTURING A SOLDERED GROSS PIECE
    BY MEASURE, comprising raw laser welding elements (10, 20) made of coated steel plates having
    5 different strengths or thicknesses using a filler cable (40), characterized in that the welded area has a composition in which a base material (12, 22) and a coating layer (14, 24) of each of the coated steel plates are mixed with the
    10 filler cable (40), where the filler cable (40) has a higher amount of an austenite stabilizer element than a base material composition (12, 22) of each of the coated steel plates,
    15 in which each coated steel plate comprises an Al-Si coating layer, where the austenite stabilizing element comprises C or Mn, where the C content of the filler cable (40) is 0.1% 20 by weight at 0.8% by weight higher than the base material (12, 22) of the coated steel plate.
    [2]
    2. METHOD, according to claim 1, characterized by the Mn content of the filler cable (40) being
    1.5% by weight to 7.0% by weight higher than material
    25 base (12, 22) of the coated steel plate.
    [3]
    3. HOT STAMPED COMPONENT, manufactured by hot stamping a blank welded by measure formed by laser welding blank (10, 20) made of coated steel plates having different
    Resistances or thicknesses using a filler cable (40), as defined by the method of claim 1, characterized in that the laser welded area has a martensitic structure.
    Petition 870190004953, of 1/16/2019, p. 7/12
    2/2
    [4]
    4. HOT PRINTED COMPONENT according to claim 3, characterized in that each of the raw elements includes a boron steel plate having hardness as a base material (12, 22), and a coating layer
    [5]
    5 from Al-Si or Zn.
    5. HOT STAMPED COMPONENT, according to claim 4, characterized in that the austenite stabilizing element comprises C or Mn.
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    法律状态:
    2018-03-06| B25A| Requested transfer of rights approved|Owner name: PUSAN NATIONAL UNIVERSITY INDUSTRY-UNIVERSITY COOP |
    2018-03-27| B25A| Requested transfer of rights approved|Owner name: HYUNDAI STEEL COMPANY (KR) |
    2018-10-23| B07A| Technical examination (opinion): publication of technical examination (opinion) [chapter 7.1 patent gazette]|
    2019-02-26| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2019-04-24| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 28/05/2013, OBSERVADAS AS CONDICOES LEGAIS. (CO) 20 (VINTE) ANOS CONTADOS A PARTIR DE 28/05/2013, OBSERVADAS AS CONDICOES LEGAIS |
    优先权:
    申请号 | 申请日 | 专利标题
    KR10-2012-0139035|2012-12-03|
    KR1020120139035A|KR101448473B1|2012-12-03|2012-12-03|Tailor welded blnk and hot stamping parts using the same|
    PCT/KR2013/004629|WO2014088170A1|2012-12-03|2013-05-28|Tailor welded blanks, method for manufacturing same, and hot stamping parts using same|
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