Unlock instant, AI-driven research and patent intelligence for your innovation.

Metal pipe for reinforcing car body and member for reinforcing car body employing it

一种金属管、车体的技术，应用在车辆部件、车辆安全安排、工艺效率的提高等方向，能够解决不能作为制品使用、不均一变形、淬火不匀等问题

Active Publication Date: 2007-01-17
NIPPON STEEL CORP +2
View PDF1 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a method, it is difficult to perform uniform cooling and quenching throughout the entire length and circumference of the pipe, and uneven quenching may occur.
[0017] For this reason, the quality of the door guard beam accompanying the bending process described in JP-A-4-280924 becomes unstable due to the occurrence of uneven quenching, and uneven deformation is the main cause, so that dimensional accuracy and shape accuracy cannot be obtained. Cannot be used as a product

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Metal pipe for reinforcing car body and member for reinforcing car body employing it
  • Metal pipe for reinforcing car body and member for reinforcing car body employing it
  • Metal pipe for reinforcing car body and member for reinforcing car body employing it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] In order to confirm the effect of the metal pipe for vehicle body reinforcement of the present invention, the following test steel pipe was produced: as a raw material, a representative composition of 0.22%C-1.20%Mn-0.20%Cr-0.02%Ti-0.0015%B was used. The low-strength (YP: 450 MPa, TS: 555 MPa, EL: 23%) capillary tube has the outer diameter, wall thickness, length, and warpage shown in Table 1, and the strength after bending is 1470 MPa class. The main structures of the tested steel pipes are martensite and bainite.

[0133] During the bending process of the steel pipe, high-frequency heating is performed to 950°C, and after the hot successive bending process, it is quenched by water cooling at a cooling rate of 300°C / sec. The degree of warpage η of the produced warped tube was varied within a range of 0.0017% to 4.720%, and the tensile strengths were all over 1500 MPa. Straight pipes with a tensile strength of 1500 MPa higher than that of warped pipes are also prepared.

[...

Embodiment 2

[0141] Various characteristics when bending the metal pipe for vehicle body reinforcement of the present invention, that is, tensile strength, structure, hardness distribution, shape freezing property, edge flatness, residual stress, and delayed destruction resistance were investigated in detail. As a raw material, a capillary with an outer diameter of 31.8 mm, a wall thickness of 2.3 mm, and a composition of 0.22% C-1.20% Mn-0.20% Cr-0.02% Ti-0.0015% B was prepared, and the strength level was varied. The prepared capillary tube was bent to produce test steel pipes, and various characteristics were investigated. Table 2 shows the strength level of the capillary tube, the bending processing conditions, and the strength level and structure of the test steel pipe.

[0142] Test

No

Distinguish

Strength condition of capillary

Bending conditions

(Heating-bending-cooling)

Strength conditions of test steel pipe (after bending)

YP

MPa

T...

Embodiment 3

[0172] In order to confirm the effect of thinning when the metal pipe for vehicle body reinforcement of the present invention is used, as a raw material, a representative composition composed of 0.22%C-1.20%Mn-0.20%Cr-0.02%Ti-0.0015%B is used Low-strength (YP: 450MPa, TS: 555MPa, EL: 23%) capillary tube, under the same conditions as in Example 1, high-frequency heating, thermal successive bending, followed by successive rapid cooling to produce the outer tube shown in Table 9 1470MPa test steel pipe with diameter, wall thickness, length and warpage. The warpage η of the prepared test steel pipe is 0.262%, the tensile strength exceeds 1500MPa, and the main structure is martensite and bainite.

[0173] As a comparative example, with the outer diameter, wall thickness, and length dimensions shown in Table 9, a straight pipe with a tensile strength exceeding 1500 MPa was prepared. Together with the example of the present invention, the image 3 (b) The three-point support bending test...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A metal pipe for reinforcing a car body and a member for reinforcing a car body each having a full-length or partial bend. Since the outer circumferential side of the bend is arranged to substantially match the direction of an impact being applied to the car body, the load rising gradient, maximum load and absorption energy are increased when the car body collides. Since the load rising gradient as the load characteristics increases especially when deformation is started, excellent impact resistance is attained for reinforcing the car body. Furthermore, ever increasing request level for the impact resistance of car body can be dealt with while reducing the weight and cost of the car body, and the invention is applicable as a protective technology of a crew to a wide field.

Description

Technical field [0001] The present invention relates to a metal pipe for vehicle body reinforcement and a vehicle body reinforcement member using the same, which can exhibit excellent impact resistance when a vehicle body collides, and can reduce the weight of the vehicle body. Background technique [0002] In recent years, in the automotive industry, the requirements for the safety of the vehicle body have increased, and the development of technologies for protecting passengers in the event of a collision has been promoted. Subsequently, in order to improve the performance of passenger protection, the structure of various parts of the vehicle body including the door was re-adjusted, and the use of reinforcement members for effective passenger protection was discussed. [0003] figure 1 It is a figure which shows the vehicle body structure which used the reinforcement member as a door impact bar (door impact bar) for the door for a motor vehicle, for example. In this door 1, a ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B60J5/00B60J5/04B60R21/02
CPCC21D9/085B60J5/0444C21D9/0068C21D7/13C21D8/105C21D8/10B21C37/155B60J5/0433B60J5/0431C21D1/42Y10T29/49622Y02P10/25
Inventor 内田光俊诸井贤儿服部义孝饭野吉克井上三郎菊池文彦
Owner NIPPON STEEL CORP