Vehicle collision energy absorbing member excellent in energy absorbing performance and manufacturing method thereof
An energy absorbing member, a technology for vehicle collision, which is applied in the field of vehicle axle crushing member to stably improve the collision energy absorption performance, and can solve the problems of ductility deterioration, inability to obtain buckling, unstable deformation shape, etc.
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Embodiment 1）
[0183] Each molten steel having the chemical composition of Table 1 was prepared by a steelmaking process and cast into a slab (steel raw material) having a thickness of 300 mm. Subsequently, the slabs thus obtained were each heated to the heating temperature shown in Table 2, then subjected to hot rolling including finish rolling under the conditions shown in Table 2, and then cooled under the conditions shown in Table 2 and Coils were coiled at the coiling temperatures shown in Table 2 to obtain hot-rolled sheets (sheet thickness: 2.4 mm).
[0184] Subsequently, the hot-rolled sheets thus obtained were each subjected to cold rolling at the cold-rolling reduction ratios shown in Table 2 to obtain cold-rolled steel sheets (sheet thickness: 1.2 mm). Subsequently, the cold-rolled steel sheets thus obtained were each subjected to an annealing process under the conditions shown in Table 2.
[0185] The steel sheets thus obtained (cold-rolled and annealed sheets) were subjected to...
Embodiment 2）
[0212] Collision energy absorbing members were produced using thin steel sheets having tensile properties, n values, and bending properties (mechanical bending radius Rc) shown in Table 5, each having a tensile strength of the order of 980 MPa to 1300 MPa, as raw materials . The collision energy absorbing member is formed as figure 2 One of these shapes of members X, W, and J of . The back plates were each formed from a 590 MPa class high strength steel plate, as in Example 1.
[0213] A crush test was performed by using these collision energy absorbing members configured as described above. The test methods were the same as those employed in Example 1.
[0214] The obtained results are shown in Table 5.
[0215] [table 5]
[0216]
[0217] All of the inventive embodiments are stably buckled in the axial direction to be crushed into a bellows shape.
[0218] In addition, the results obtained in Example 1 and Example 2 with respect to the limit bending radius and the ...
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Abstract
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