KR20130122493A - Manufacturing method of vehicle part using tailored blank press hardening - Google Patents

Manufacturing method of vehicle part using tailored blank press hardening Download PDF

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Publication number
KR20130122493A
KR20130122493A KR1020120053844A KR20120053844A KR20130122493A KR 20130122493 A KR20130122493 A KR 20130122493A KR 1020120053844 A KR1020120053844 A KR 1020120053844A KR 20120053844 A KR20120053844 A KR 20120053844A KR 20130122493 A KR20130122493 A KR 20130122493A
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KR
South Korea
Prior art keywords
coating layer
manufacturing
metal sheet
tbph
metal plate
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Application number
KR1020120053844A
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Korean (ko)
Inventor
원광우
김대근
서판기
남재두
차승훈
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주식회사 신영
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Publication of KR20130122493A publication Critical patent/KR20130122493A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/361—Removing material for deburring or mechanical trimming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/60—Preliminary treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Laser Beam Processing (AREA)

Abstract

The present invention discloses a method for manufacturing a vehicle body part using TBPH technology which enables stiffness to be improved. To this end, the body part manufacturing method using the TBPH technology is to remove the welded portion of the Al-Si coating layer on at least one surface of the metal plate, and to close the Al-Si coating layer removed from the metal plate by laser Welding, and heating the welded metal sheets, followed by processing and cooling to a specific shape. Accordingly, even if both the TWB method and the hot stamping method are performed, the mechanical strength of the manufactured object is not reduced, thereby improving impact absorption performance while realizing light weight and high strength of the object.

Description

Manufacturing method of vehicle part using Tailored Blank Press Hardening}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a body part using TBPH technology, and more particularly, to a method for manufacturing a body part using TBPH technology used to manufacture a part constituting a part of a vehicle.

Recently, as oil prices have soared and interest in environmental issues has increased, efforts to increase fuel efficiency of vehicles have been increasing. Fuel economy of a vehicle is generally reduced as the weight of the vehicle increases, and increases as the weight of the vehicle is decreased. Therefore, in order to increase the fuel economy of the vehicle, it is necessary to reduce the weight of the body of the vehicle, and to reduce the weight of the body of the vehicle, the weight of the components constituting the vehicle must be reduced.

In particular, the weight reduction of the vehicle is attracting the most attention among the fuel efficiency improvement technology, and research and development are being conducted in various fields such as parts reduction, structural improvement, and light weight of materials. In addition, weight reduction of the vehicle material increases the engine efficiency to maximize the performance of the vehicle, thereby improving fuel efficiency, and thus is the most suitable and effective method for environmental pollution prevention and fuel reduction.

In addition, the vehicle is moved at a high speed, and there is a need to protect the occupant by absorbing an external shock in case of a contact accident with another vehicle or a specific member. Accordingly, there is an increasing demand for components that maintain crash stability while realizing lightweight vehicles.

On the other hand, in order to realize the weight reduction of the vehicle parts, the vehicle parts are recently manufactured by a hot stamping method. Hot-stamping is a method of heating and cooling an object with high heat. When manufacturing the vehicle body of the vehicle by such a hot stamping method, it is possible to increase the strength of the vehicle body, but there is a problem that the collision absorption performance is reduced.

In order to solve this problem, a method of manufacturing a vehicle body by a tail welded blank (TWB) method may be provided.

Korean Patent Laid-Open Publication No. 10-2006-0059468 (published June 2006) discloses a mold for molding aluminum TWB material. The TWB method using such a mold is to weld two steel plates and press them into a press or a mold so that an object becomes a specific shape. The TWB method can eliminate the reinforcement material, which is very effective in reducing cost and weight by reducing mold cost and material. In addition, the body of the vehicle manufactured by the TWB method has the advantage of improving the impact absorption performance while implementing a lighter weight and higher strength.

On the other hand, in manufacturing a vehicle body, Al-Si-coated boron alloy steel may also be manufactured. Al-Si serves to improve the chemical performance of alloy steels. For example, Al-Si prevents corrosion of alloy steels, prevents oxidation, and improves resistance to high temperatures. When Al-Si-coated boron alloy steels are welded by the TWB method, there is a problem in that the mechanical strength of the welded portion, that is, the bonding force, is reduced.

It is an object of the present invention to provide a method of manufacturing a vehicle body and a method of manufacturing the same, in which the TBPH technique is applied, which enables the reduction in the mechanical strength of the welded object to be prevented.

In order to achieve the above object, the method for manufacturing a vehicle body part using the TBPH technology according to the present invention includes removing the welded portion from the Al-Si coating layer on at least one surface of the metal sheet, and the Al-Si coating layer from the metal sheet. Contacting the removed portion by laser welding, and heating the welded metal sheet, followed by processing and cooling to a specific shape.

Body parts manufacturing method applying the TBPH technology of the present invention in the body parts manufacturing method applying the TBPH technology according to the present invention, even if the part of the Al-Si coating layer to perform both the TWB method and hot stamping method manufactured object By not reducing the mechanical strength of the, it is possible to improve the impact absorption performance while realizing the weight and strength of the object.

1 to 5 sequentially illustrate a method of manufacturing a vehicle body part to which TBPH technology is applied according to an exemplary embodiment of the present invention.
1 is a cross-sectional view showing a state where a metal sheet is provided,
2A is a cross-sectional view illustrating a state in which an Al-Si coating layer on a metal sheet is removed.
Figure 2b is a perspective view schematically showing the removal of the laser removal apparatus Al-Si coating layer.
Figure 3 is a cross-sectional view showing a state in which the metal plate material is removed Al-Si coating layer.
4 is a cross-sectional view showing a state in which metal sheet materials are welded.
5 is a cross-sectional view showing a state in which the welded metal sheet is deformed into a specific shape.
Figure 6 is a graph showing the measured tensile strength and elongation of each member.
Figure 7 is a graph showing the measured strain according to the stress of each member.

The present invention will now be described in detail with reference to the accompanying drawings. The same reference numerals are used for the same components, and repeated descriptions and detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

Body part manufacturing method applying the TBPH technology according to a preferred embodiment of the present invention is a method used to manufacture the parts of the vehicle by welding the metal plate formed with the Al-Si coating layer, Al-Si coating layer on at least one side of the metal plate Removing the welded portion from the metal sheet, welding the portion of the Al-Si coating layer removed from the metal sheets to be in close contact with the laser, and heating the welded metal sheets, followed by processing and cooling to a specific shape. It includes.

Hereinafter, with reference to the drawings, each step of the vehicle body manufacturing method to which the TBPH technology according to the present invention is applied will be described in detail.

First, as shown in FIG. 1, the metal plate 110 is provided. 2, the portion to be welded is removed from the Al-Si coating layer 110 on at least one surface of the metal plate 110. As an example of a method of removing the Al-Si coating layer 110 on the metal plate 110 in this step, a method of removing the Al-Si coating layer 110 using the laser removal apparatus 10 may be used. The laser removing device 10 is configured to irradiate a laser to the metal plate 110. The degree of removal of the surface of the metal plate 110 may be controlled through the moving speed and the removal frequency of the portion irradiated with the laser. The moving speed of the laser irradiated part 10 in the laser ablation apparatus 10 is repeated one to five times at a speed of approximately 200 mm / sec to 600 mm / sec to form the Al-Si coating layer 110 on the metal plate 110. This can be removed.

More preferably, the laser removing device 10 irradiates a laser on the metal sheet 110 at a rate of 280 mm / sec to 420 mm / sec once or twice to form the Al-Si coating layer formed on the metal sheet 110. 110 may be made to remove. This is to maximize the bonding force of the welded metal sheet 110.

Here, when the laser is moved on the metal plate 110 at a speed of less than 200 mm / sec, Al, Si particles are combined with the base material (Fe) to form or re-solidify the compound (FeAl3, Fe2Al5) to weaken the bonding force Can be done. In addition, when the laser is moved on the metal plate 110 at a speed exceeding 600 mm / sec, proper welding does not occur and the bonding force may be weakened.

Meanwhile, a part of the Al-Si coating layer 110 formed on one surface of the metal plate 110 is removed in the process of removing the welded portion of the Al-Si coating layer 110 on at least one surface of the metal plate 110. It is also possible to remove a portion of the Al-Si coating layer 110 formed on both sides of the metal plate 110.

In addition, the method of removing the welded portion from the Al-Si coating layer 110 on at least one surface of the metal plate 110 is not limited to using the laser removing device 10, and the removal tool on the metal plate 110. It is also possible to remove the Al-Si coating layer 110 by a mechanical method in close contact with the.

Next, referring to FIGS. 3 and 4, the Al-Si coating layer 110 is removed from the metal sheets 110 to be welded by laser. In this step, the metal plate 110 may be seated on the welding jig, and the metal plate 110 may be welded by a welder.

Finally, referring to FIG. 5, the welded metal sheet 110 is heated, then processed into a specific shape and cooled. This step will be described in more detail. The metal plate 110 is put into a heater and heated. Then, the metal plate 110 is heated to a specific shape by deforming with a press or the like. In this case, a hot stamping method may be used. The hot stamping method is a method in which the metal plate 110 is heated to about 900 ° C. or more, which is an austenite, and then cooled to be transformed into martensite. The metal sheet 110 produced by such hot stamping is improved in tensile strength to become a high strength metal sheet.

In the method of manufacturing a vehicle body part using the TBPH technology according to the present invention as described above, even if a part of the Al-Si coating layer is removed and then both the TWB method (Tailor Welded Blank) and the hot stamping method (Press Hardening) are performed, the mechanical strength of the manufactured object is achieved. By not being reduced, it is possible to improve the impact absorption performance while realizing the weight and strength of the object.

On the other hand, it can be more clearly understood from Fig. 6 and 7 that the stiffness of the vehicle parts manufactured by the vehicle body part manufacturing method to which the TBPH technology according to the present invention as described above is improved than the conventional body part manufacturing method. have.

6 is a graph showing the measured tensile strength and elongation of each member.

Referring to Fig. 6, member A is a pure metal plate. The B member is a welded metal sheet on which both surfaces of the Al-Si layer have been removed by a laser. The C member is welded to the metal sheet on which both surfaces of the Al-Si layer are removed by the removal tool. The member D is a welded metal sheet from which the Al-Si layer on the upper surface has been removed by a laser. E member welds the metal plate from which the Al-Si layer of the lower surface was removed by the laser. The F member is a welded metal sheet in which the Al-Si layer is not removed.

As shown in Figure 6, it can be seen that the tensile strength and elongation of the B member to E member than the F member. And, it can be seen that the tensile strength and elongation excellent from the E member to the B member. That is, a vehicle part manufactured by a conventional vehicle body part manufacturing method of welding metal plate members without removing the Al-Si coating layer removes the Al-Si coating layer and welds the metal plate members according to the present invention. It can be seen that the rigidity is superior to the vehicle parts manufactured by the manufacturing method. In addition, it can be seen that the vehicle parts welded by removing only the Al-Si coating layers on both sides of the metal plates are superior in rigidity than the vehicle parts welded by removing only the Al-Si coating layers on one side of the metal plates. In particular, it can be seen that the vehicle parts welded by removing the Al-Si coating layer by irradiating laser on both sides of the metal sheet material have the best rigidity.

7 is a graph illustrating a measurement of strain according to stress of each member.

As shown in FIG. 7, the F member, which welded the metal plate without removing the Al-Si layer, was destroyed at about 1150 Mpa, but the B member, which is the metal plate material on which the Al-Si layer on both sides was removed by laser, was about 1500 Mpa. It can be seen from the destruction. That is, a vehicle part manufactured by a conventional vehicle body part manufacturing method of welding metal plate members without removing the Al-Si coating layer removes the Al-Si coating layer and welds the metal plate members according to the present invention. It can be clearly seen that the rigidity is superior to the vehicle parts manufactured by the manufacturing method.

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by the embodiments and the accompanying drawings. . The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

100: vehicle parts
110: metal sheet
120: Al-Si coating layer

Claims (4)

In the method of manufacturing a vehicle body part by applying the TBPH technology for manufacturing a vehicle part by welding the metal plate formed Al-Si coating layer,
Removing the welded portion of the Al-Si coating layer on at least one surface of the metal sheet;
Welding the laser-bonded portions of the metal sheets to which the Al-Si coating layer has been removed; And
Heating the welded metal sheets and then processing and cooling to a specific shape;
Body parts manufacturing method applying TBPH technology comprising a. The method of claim 1,
In the step of removing the welded portion of the Al-Si coating layer on at least one surface of the metal sheet,
A method of manufacturing a vehicle body part using TBPH technology, characterized in that the Al-Si coating layer formed on the metal sheet is removed by irradiating a laser once or twice on the metal sheet at a speed of 280 mm / sec to 420 mm / sec. The method of claim 1,
In the step of removing the welded portion of the Al-Si coating layer on at least one surface of the metal sheet,
A method of manufacturing a body part using TBPH technology, characterized in that a part of Al-Si coating layer formed on one side of a metal sheet is removed. The method of claim 1,
In the step of removing the welded portion of the Al-Si coating layer on at least one surface of the metal sheet,
A method for manufacturing a body part using TBPH technology, characterized in that a part of Al-Si coating layer formed on both sides of a metal sheet is removed.
KR1020120053844A 2012-04-30 2012-05-21 Manufacturing method of vehicle part using tailored blank press hardening KR20130122493A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20120045826 2012-04-30
KR1020120045826 2012-04-30

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105382409A (en) * 2015-12-25 2016-03-09 中国航空工业集团公司北京航空制造工程研究所 Laser shock processing method of thin plate welding structure
CN111801192A (en) * 2018-03-02 2020-10-20 奥钢联汽车零部件林茲股份有限公司 Welding pretreatment method for coated steel plate
US11491581B2 (en) 2017-11-02 2022-11-08 Cleveland-Cliffs Steel Properties Inc. Press hardened steel with tailored properties

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105382409A (en) * 2015-12-25 2016-03-09 中国航空工业集团公司北京航空制造工程研究所 Laser shock processing method of thin plate welding structure
US11491581B2 (en) 2017-11-02 2022-11-08 Cleveland-Cliffs Steel Properties Inc. Press hardened steel with tailored properties
CN111801192A (en) * 2018-03-02 2020-10-20 奥钢联汽车零部件林茲股份有限公司 Welding pretreatment method for coated steel plate

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