KR20170064271A - A bumper beam for vehicles - Google Patents

A bumper beam for vehicles Download PDF

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Publication number
KR20170064271A
KR20170064271A KR1020150169832A KR20150169832A KR20170064271A KR 20170064271 A KR20170064271 A KR 20170064271A KR 1020150169832 A KR1020150169832 A KR 1020150169832A KR 20150169832 A KR20150169832 A KR 20150169832A KR 20170064271 A KR20170064271 A KR 20170064271A
Authority
KR
South Korea
Prior art keywords
bumper beam
heat
treated
vehicle
bending
Prior art date
Application number
KR1020150169832A
Other languages
Korean (ko)
Inventor
노시영
이문용
Original Assignee
주식회사 성우하이텍
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 성우하이텍 filed Critical 주식회사 성우하이텍
Priority to KR1020150169832A priority Critical patent/KR20170064271A/en
Publication of KR20170064271A publication Critical patent/KR20170064271A/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/24—Arrangements for mounting bumpers on vehicles
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • B60R2019/1806—Structural beams therefor, e.g. shock-absorbing

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

A vehicle bumper beam is disclosed. The bumper beam for a vehicle according to an embodiment of the present invention forms a predetermined curvature and includes a front face facing forward and an upper face and a lower face bent and formed in the horizontal direction from the upper side and the lower side of the front face, The bumper beam is formed as a heat treatment unit uniformly heat-treated in a certain range of the front surface, the upper surface and the lower surface except for the bending portion.

Description

A BUMPER BEAM FOR VEHICLES < RTI ID = 0.0 >

More particularly, the present invention relates to a bumper beam for a vehicle, and more particularly, to a bumper beam which is formed by hot-stamping a boron steel plate as a material to produce a bumper beam. To a vehicle bumper beam.

Generally, a vehicle body including a beam such as a bumper of an automobile is formed by pressing a steel-based steel sheet material, and the rigidity of these steel sheet materials greatly affects the collision stability.

1 is a conceptual diagram of a general hot stamping process.

Referring to FIG. 1, a hot stamping technique, which is a hot press forming technique using a boron steel plate 111, has been actively researched in order to simultaneously satisfy the high strength and light weight of a steel sheet material.

That is, in the hot stamping method, the boron steel plate 111 is heated to austenite stabilization temperature (about 900 ° C.), molded at once in the press mold 113, and then rapidly cooled to manufacture the high strength body component 115 Molding method.

The boron steel sheet 111 is a steel sheet to which a small amount of boron (B) is added. Boron is segregated in an atomic state at the austenite grain boundary under the above-mentioned optimum temperature condition, and the free energy of the austenite grain boundary is lowered , It is possible to suppress the generation of pro-eutectoid ferrite nuclei, thereby remarkably improving the hardenability of the steel (the ability of the steel to harden by forming martensite at the time of quenching).

The hot stamping method using the boron steel plate 111 differs from the conventional method using a high strength steel, in that a boron steel sheet 111 having a ferrite structure having a tensile strength of about 500 to 800 MPa before molding is heat- Followed by rapid cooling to produce a molded article of martensite structure having a high tensile strength of about 1300 to 1600 MPa.

Therefore, the hot stamping molded article can have a strength of 4 to 5 times higher than that of a general steel plate part, but its weight can be reduced by up to 40% compared with the conventional one, which is advantageous in achieving both weight saving and high strength characteristics.

FIG. 2 is a perspective view of a conventional bumper beam unit according to the related art, and FIG. 3 is a sectional view of a conventional bumper beam according to the related art.

2 and 3, the bumper beam unit 100 for a vehicle manufactured by applying the hot stamping method described above has a structure in which the bumper beam 101 arranged in the vehicle width direction from the front and rear of the vehicle is supported by the two side stays 103 (Not shown) on the side of the vehicle body.

The bumper beam unit 100 absorbs the impact energy while the bumper beam 101 is deformed due to an impact at the time of a frontal collision of the vehicle, and then the impact energy is absorbed by the bumper beam unit 100 to the vehicle body such as the front side member And the minimum impact is transmitted.

The conventional bumper beam 101 is formed by hot stamping using a boron steel plate and has a bending portion B having a generally "C" -shaped cross section and bent in an annular shape at the upper and lower ends, F is formed with a groove portion G facing rearward to reinforce the rigidity with respect to the longitudinal direction.

However, since the bumper beam 101 according to the related art is made of a boron steel sheet, which is a single material, the whole is made rigid through the hot stamping molding. Accordingly, when the bumper beam 101 is collided, (B), cracks due to lack of ductility occur first.

That is, it is difficult to predict the directionality of deformation due to the impact of the bumper beam 101 itself due to the occurrence of cracks in the bending portion (B), and thus it is more difficult to predict the impact energy absorption and dispersion ability.

The matters described in the background section are intended to enhance the understanding of the background of the invention and may include matters not previously known to those skilled in the art.

In the embodiment of the present invention, the hot stamping process is performed in a state in which the bending portion requiring ductility is not heated during the production of the bumper beam by hot stamping-molding the boron steel sheet as a material, thereby ensuring the ductility of the bending portion, To thereby provide a bumper beam for a vehicle having improved impact energy absorption and dispersion performance.

In one or more embodiments of the present invention, a curved surface is formed, which has a front surface facing forward, an upper surface and a lower surface that are respectively bent in a horizontal direction from the upper and lower sides of the front surface, Wherein the bumper beam is formed by a bumper beam that is uniformly heat treated within a certain range of the front surface and the upper surface and the lower surface except for the bending portion. Can be provided.

Further, at the center of the front surface, a backward facing groove may be formed at a predetermined depth along the longitudinal direction of the bumper beam.

Further, the heat treatment unit may be heat-treated by energization heating in which electrodes are connected to the bending units on both sides.

Also, the heat treatment unit may be heat-treated by irradiating a laser beam of a non-focal region to a portion excluding the both-side bending portion.

In addition, the heat treatment unit may be heat-treated by a near infrared ray heating to a portion except for the two side bending portions.

In addition, the heat treatment unit may be heat-treated by far-infrared heating to a portion except for the two side bending portions.

Further, the heat treatment section may be subjected to heat treatment by high frequency induction heating at a portion excluding the both bending portions.

Also, the bumper beam can be hot-stamped using a boron steel sheet as a material.

In the embodiment of the present invention, hot stamping molding is performed on a boron steel plate as a material, hot stamping is performed in a state in which a bending part requiring ductility is not heated at the time of manufacturing a bumper beam to secure ductility of the bending part, It is possible to suppress the occurrence of cracks in the bending portion at the time of deformation of the beam to improve the absorption and dispersion performance of impact energy.

1 is a conceptual diagram of a general hot stamping process.
2 is a perspective view of a conventional bumper beam unit for a vehicle.
3 is a cross-sectional view of a conventional bumper beam for a vehicle.
4 is a perspective view of a bumper beam for a vehicle according to an embodiment of the present invention.
5 is a cross-sectional view of a bumper beam for a vehicle according to an embodiment of the present invention.
Fig. 6 is a view showing a manufacturing process of a bumper beam for a vehicle according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It should be noted that the sizes and thicknesses of the respective components shown in the drawings are arbitrarily shown for convenience of explanation, and parts that are not related to the description will be omitted for clarifying the embodiments of the present invention.

FIG. 4 is a perspective view of a bumper beam for a vehicle according to an embodiment of the present invention, and FIG. 5 is a sectional view of a bumper beam for a vehicle according to an embodiment of the present invention.

Referring to FIGS. 4 and 5, the vehicle bumper beam according to the embodiment of the present invention is disposed in the vehicle width direction from the front or rear of the vehicle, and is mounted on a vehicle side member (not shown) through stays Respectively.

Here, the vehicle bumper beam 1 according to the embodiment of the present invention is manufactured by hot stamping using a boron steel plate as a material.

That is, the bumper beam 1 has a front surface 3 and a top surface 5 and a bottom surface 7 in a horizontal direction with respect to the front surface 3, so that the bumper beam 1 has a "C" shape as a whole.

The front face 3 forms a curvature and faces forward and the upper face 5 and the lower face 7 form curved corner portions A in the horizontal direction from the upper side and the lower side of the front face 3 And is bent and formed.

The upper surface 5 and the lower surface 7 are bent and formed perpendicularly to the respective ends to form a bending portion B for forming a flange F. A bumper beam 1) is formed with a predetermined depth to the rear side along the longitudinal direction.

The heat treatment part HT is uniformly heat treated within a certain range of the front surface 3 and the upper surface 5 and the lower surface 7 except for the bending part B.

The heat treatment portion HT is a portion heated by using a heating source before the hot stamping molding of the boron steel sheet as a material and has a stiffness as high as 4 to 5 times higher than a portion not heated.

That is, the heat treatment unit HT is heated to the annealing temperature of the metal structure by the heating source, and then cooled, so that the internal stress is removed, and the surface modification has characteristics of high rigidity and high hardness.

Fig. 6 is a view showing a manufacturing process of a bumper beam for a vehicle according to an embodiment of the present invention.

6, the vehicle bumper beam 1 is an example in which the heating source is the electric heating heater 10, and the bumper beam 1 for the vehicle is provided at both ends of the boron steel plate 13, which is seated on the table 11 of the electric heater 10, The power source is supplied in a state in which the both side electrodes T1 and T2 are in contact with the bending portion B in the state where the bending portion B is in contact with each other, The boron steel plate 13 having the processing section CT and the heat treatment section HT heated and energized between the non-heat treatment sections CT is put into the mold of the hot stamping process to perform hot stamping molding. (S3)

At this time, in the case of energization heating by the energization heater 10, the non-heating portion CT of the bending portion B is formed using the fact that about 10 mm to 15 mm is not heated from the both electrodes T1 and T2 There is an advantage to be able to do.

Here, in the embodiment of the present invention, the material is heated by the electrification heating method using the heating source as the electrification heater 10, but the material is not necessarily limited to this, but the heating source may be heat treated by using a laser beam of a non- Or may be heat-treated using a near-infrared heater, or may be heat-treated using a far-infrared heater, or may be heat-treated using a high-frequency induction heater.

Therefore, the bumper beam 1 for a vehicle having the above-described structure has the upper and lower bending portions B as the non-heating portion CT, and the bumper beam B is formed on the front face 3, the upper face 5 and the lower face 7 It is possible to secure the ductility in comparison with the heat treatment unit HT formed and thus to minimize the occurrence of cracks in the bending portion B despite the fact that the bent shape of the bending portion B is applied at the time of collisional deformation.

That is, cracking in the bending portion B is suppressed, and the directionality of the deformation due to the impact of the bumper beam 1 itself can be predicted, so that the impact energy absorbing and dispersing ability can be predicted.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

1: Bumper beam
3: Front
5: Top surface
7: When
9: Groove
A:
B: Bending section
F: Flange
HT: heat treatment unit
CT: Specific heat treatment section

Claims (8)

The upper and lower surfaces being bent and formed in the horizontal direction from the upper and lower sides of the front surface and the both side bending portions forming the flange by being bent in the vertical direction from the upper surface and the lower surface, A vehicle bumper beam comprising:
Wherein the bumper beam is formed by a heat treatment uniformly heat-treated in a certain range of the front surface, the upper surface and the lower surface excluding the bending portion. The method according to claim 1,
In the center of the front surface
And a rearward-facing groove portion is formed at a predetermined depth along the longitudinal direction of the bumper beam. The method according to claim 1,
The heat-
Wherein the bumper beam is heat-treated by energization heating in which electrodes are connected to the bending portions on both sides. The method according to claim 1,
The heat-
Wherein the bumper beam is irradiated with a laser beam of a non-focal region to the portion excluding the both-side bending portion. The method according to claim 1,
The heat-
Wherein the bumper beam is heat-treated through near-infrared heating on a portion excluding the two bending portions. The method according to claim 1,
The heat-
Wherein the bumper beam is heat-treated through far-infrared heating to a portion except for the two bending portions. The method according to claim 1,
The heat-
Wherein the bumper beam is heat-treated by high-frequency induction heating at a portion excluding the bending portions. The method according to claim 1,
The bumper beam
Characterized in that the bumper beam is formed by hot stamping using a boron steel plate as a material.
KR1020150169832A 2015-12-01 2015-12-01 A bumper beam for vehicles KR20170064271A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150169832A KR20170064271A (en) 2015-12-01 2015-12-01 A bumper beam for vehicles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150169832A KR20170064271A (en) 2015-12-01 2015-12-01 A bumper beam for vehicles

Publications (1)

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KR20170064271A true KR20170064271A (en) 2017-06-09

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KR1020150169832A KR20170064271A (en) 2015-12-01 2015-12-01 A bumper beam for vehicles

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109513814A (en) * 2018-09-27 2019-03-26 合肥百恒设备模具有限公司 A kind of roof panel punching production technique
CN112455372A (en) * 2020-10-28 2021-03-09 南京航空航天大学 Automobile front anti-collision beam with heat dissipation function

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109513814A (en) * 2018-09-27 2019-03-26 合肥百恒设备模具有限公司 A kind of roof panel punching production technique
CN112455372A (en) * 2020-10-28 2021-03-09 南京航空航天大学 Automobile front anti-collision beam with heat dissipation function

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