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Member for reinforcing vehicle body

A component and car body technology, applied in the field of car body reinforcement components, can solve the problems that it is difficult to traverse the entire length and circumference of the reinforcement components, uneven deformation, soft spots, etc.

Active Publication Date: 2008-02-27
NIPPON STEEL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] For example, when processing a "full-length R bend pipe", the bending processing method of the door protection beam described in the above-mentioned Japanese Patent Application Laid-Open No. 4-280924 utilizes a linear pipe that is directly energized and heated, and then pressed into a mold while The method of spraying cooling water, therefore, it is difficult to uniformly cool and quench across the entire length and circumference of the reinforcing member, and soft spots may occur
[0019] Therefore, the door protection beam with bending process described in the above-mentioned JP-A-4-280924 has problems that the quality is not stable due to the occurrence of soft spots, and the dimensional accuracy cannot be ensured due to uneven deformation, and the shape freezes. property, it is impossible to obtain products requiring stable impact resistance quality

Method used

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  • Member for reinforcing vehicle body
  • Member for reinforcing vehicle body
  • Member for reinforcing vehicle body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142] In order to confirm the thinning (lightweight) effect of using a steel pipe as a vehicle body reinforcement member of the present invention, a representative composition of 0.22%C-1.20%Mn-0.20%Cr-0.02%Ti-0.0015 was used as a raw material. Low-strength (YP: 450MPa, TS: 555MPa, EL: 23%) raw material tubes composed of %B are heated at 950°C by high-frequency heating, and after successive bending by thermal processing, they are cooled by water at a cooling rate of 300°C / sec. Sequential quenching was carried out, and a "multi-part R bend" consisting of a convex curved part having three local curvature radii R (curvature 1 / R) and a straight part in the adjacent part as shown in the above-mentioned Fig. 6 was fabricated. 1470MPa grade steel pipes for testing.

[0143] The manufactured steel pipes for test have the dimensions and shapes shown in Table 1, the tensile strength exceeds 1500 MPa, and the microstructure is martensite and bainite.

[0144] As Comparative Example 1, ...

Embodiment 2

[0151] A detailed investigation was conducted on the properties of the steel pipe used as the vehicle body reinforcement member of the present invention, that is, tensile strength, structure, hardness distribution, shape freezing, flatness, residual stress, and resistance to delayed failure. As a raw material, a raw material tube having an outer diameter of 31.8 mm, a wall thickness of 2.3 mm, a component composition of 0.22%C-1.20%Mn-0.20%Cr-0.02%Ti-0.0015%B, and varying strength levels was prepared. Bending processing was performed on the prepared raw material pipes to produce test steel pipes, and various characteristics were investigated. Table 2 shows the strength level of the raw material pipes, the bending processing conditions, and the strength level and structure of the steel pipes tested.

[0152] 【Table 2】

[0153] Table 2

[0154] try

test

No.

differentiate

Strength conditions of raw material tubes

Bending conditions

(he...

Embodiment 3

[0197] In order to confirm the effect of thinning (weight reduction) when steel plates are used as car body reinforcement members of the present invention, a representative composition of 0.22%C-1.20%Mn-0.20%Cr-0.02%Ti-0.0015 A low-strength (YP: 450MPa, TS: 555MPa, EL: 23%) steel plate composed of %B is heated at 950°C by high-frequency heating, and after being stamped in a hot state, it is cooled in a stamping metal mold in this state , Quenching, and thus, a 1470MPa-class stamped product with a U-shaped cross-section was produced.

[0198] Fig. 25 is a diagram showing the shape of the press-formed product used in Example 3. The same figure (a) shows the overall shape of the "partially R-bent formed product" tested as Examples 1 and 2 of the present invention, and the same figure (b) Shows the overall shape of the "partially concave-convex curved molded product" tested as Example 3 of the present invention, the same figure (c) shows the overall shape of the "partially concave...

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Abstract

A member for reinforcing a vehicle body capable of absorbing more energy than conventional reinforcement members using straight tubes and ''overall length R-bent tubes'' at the time of collision of the vehicle body by applying either of a ''partially R-bent tube'', a ''multi-portion R-bent tube'' and a ''partially recessed and protruded bent tube'' specified in this invention to the member for reinforcing the vehicle body so as to develop excellent impact resistance for reinforcing the vehicle body. The dimensions (outer diameter, wall thickness) of a metal tube used as the member for reinforcing the vehicle body are reduced while maintaining the impact resistance and the shape thereof is reviewed to reduce the weight and cost of the vehicle body. Also, since the member can cope with a requested level for a more and more increasing impact resistance of the vehicle body, it can be widely used as an occupant protective technology.

Description

technical field [0001] The present invention relates to a vehicle body reinforcement member capable of exhibiting excellent impact resistance in the event of a vehicle body collision and at the same time reducing the weight of the vehicle body. A member for car body reinforcement that further improves impact resistance due to buckling properties. Background technique [0002] In recent years, in the automotive industry, the safety requirements for the vehicle body have been increased, and the development of technology to protect passengers in the event of a collision has been increasingly advanced. Along with this, in order to improve the occupant protection performance, the structure of each part of the vehicle body including the door is improved, and the reinforcement member for effectively protecting occupants is studied. [0003] FIG. 1 is a diagram showing, for example, a structure of a vehicle body in which a reinforcement member is used as a door bumper for a door of...

Claims

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Application Information

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IPC IPC(8): B60J5/00B21D7/08B21D7/16B60R21/02C21D9/08
CPCC21D9/08C21D9/00B21D7/08B60J5/0431B21D7/16B60J5/0444B60J5/0448B60J5/0433B60J5/0443
Inventor 内田光俊服部义孝诸井贤儿井上三郎菊池文彦
Owner NIPPON STEEL CORP
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