JPS58105881A - Reinforcing treatment of chassis member for vehicle - Google Patents

Abstract

PURPOSE:To ensure that an impact load applied from both ends of a chassis member is absorbed in the chassis member, by quenching a part of the chassis member where a deforming load is concentrated. CONSTITUTION:In the chassis member 1, a base plate 5 is welded to a channel frame 4 provided with a displaced part 2' as the part where the deforming load is concentrated, which part 2' is provided with local parts 3'. The part 2' is subjected to a quenching treatment by using a high-frequency induction heating means, whereby the part 2' is hardened and reinforced over its entire thickness. Accordingly, when an impact load F is applied to both of the ends of the chassis member 1', the displaced 2' is not deformed because it has been reinforced, the energy of the load F is absorbed into the chassis member, and stress and strain due to the absorption of energy are dispersed.

Description

DETAILED DESCRIPTION OF THE INVENTION The disclosed technology belongs to the technical field of increasing the strength of a chassis member of an automobile or the like by heat treating a portion where collision deformation load is concentrated.

Therefore, this invention relates to a method for controlling the stress that can be applied to the front member, rear member, etc. of a frame forming the body frame of a vehicle such as an automobile by performing a reinforcing process. Reinforcement of a chassis member of a vehicle in which the entire wall thickness of the displaced portion is hardened to the displaced portion as a concentrated portion during collision deformation of the chassis member, thereby reinforcing the displaced portion. This invention relates to a processing method.

As is well known, as shown in FIG. 1, front and rear shear members 1, which together with sight rails form the chassis frame of a vehicle such as an automobile, have displacement portions 2 integrally molded due to structural constraints with the vehicle. Therefore, the load is concentrated on the displacement portion 2.

Therefore, when an impact load F is applied to both ends of the chassis member 1, the load is concentrated on the displaced portion 2 and the local portion 3 as shown in FIG. 2, as shown in the table of FIG. 3. There was a problem in that the energy absorption efficiency of stress strain λ was poor, and therefore, a load was applied to the local portion 3, causing buckling, deformation, etc. in the displacement portion 2.

To deal with this, the thickness and shape of the chassis members mentioned above,
A method of controlling the deformation mode by changing the section modulus or reinforcing the displacement portion 2 with means such as a patch plate has been devised and adopted.

However, in the former case, it is not only necessary to change the overall structure, but also to make the plate thickness /[%<L, the shape complicated, and to uniquely select a material with a high section modulus. Therefore, there were disadvantages such as poor workability, increased material cost, and excessive weight.

In addition, in the latter case, after the chassis member 1 is processed and formed, the patch plate and the like must be attached separately by spot welding, etc., which complicates the process and increases the number of machining steps. There was an IL point next.

The purpose of the present invention is to solve the two problems by applying hardening to the entire wall thickness of the displacement part of the chassis member, in view of the problems in the method of reinforcing the armor chassis member based on the above-mentioned prior art. It is an object of the present invention to provide an excellent method for reinforcing a chassis member of a vehicle in which the deformation mode can be easily controlled using conventional shapes, materials, and plate thicknesses.

In accordance with the above-mentioned object, the structure of the present invention is such that the deformation load concentrated portion of the chassis member is reinforced by hardening treatment,
The gist of the present invention is to ensure that the impact load applied from both ends of the chassis member is absorbed within the chassis member.

Next, one embodiment of the present invention will be described below with reference to the drawings from FIG. 4 onwards.

Reference numeral 1' denotes a seven-branch member similar to that shown in FIG. 1, which forms the chassis frame.A base plate 5 is welded to a channel frame 4 in which a displacement part 2' having a local part 3' and a deformation load concentration part has been formed. There is.

Then, the displaced portion 2' is hardened by means of high-frequency induction heating to harden the entire wall thickness of the displaced portion 2'.
reinforcement.

Then, an impact load F is applied to both ends of the chassis member 1'.
When the energy of the impact load F is reliably absorbed into the chassis member 1' without deforming the displaced portion 2' due to the reinforcement, as shown in the table shown in FIG. are distributed.

Therefore, by adjusting the above-mentioned hardening process in a predetermined manner, the desired deformation region, for example, the above-mentioned chassis member 1 as shown in FIG.
The deformation mode can be controlled so that energy is absorbed at both ends 6, 6 of '.

It should be noted that the embodiments of this invention are of course not limited to the above-mentioned embodiments; for example, the chassis member is not limited to the channel shape but may also be a pipe, and the hardening means may be spot or laser. Aspects can be adopted.

As described above, according to the present invention, in the method for reinforcing a seven-palm member of a vehicle, basically the entire thickness of the portion of the chassis member where the deformation load is concentrated is hardened. Since the deformation load concentrated portion is directly hardened and reinforced, it not only has good workability and reduced costs, but also has excellent effects such as versatility with conventional products.

Furthermore, since the reinforcement is achieved by hardening, not only can the reinforcement parts be made finer, but also the strength can be adjusted freely.Therefore, the deformation mode due to energy absorption can be controlled without changing the shape of the chassis member. This effect is also produced.

Furthermore, the reinforcement has the advantage that, depending on the design, the chassis member can be made even lighter.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of the chassis member, Fig. 2 is a distortion graph of the chassis member due to impact load, Fig. 3 is an explanatory diagram of the distortion state of the chassis member, and Fig. 4 and the following are parts of the present invention.
4 is a schematic explanatory diagram of the embodiment, FIG. 5 is a distortion graph due to impact load of the embodiment, and FIG. 6 is a diagram illustrating the state of distortion in the embodiment. 1.1'...Chassis member, 2.2'...Deformation load concentration part

Claims (1)

[Claims] A method of reinforcing a vehicle chassis member for collision deformation control, wherein the entire wall thickness of the deformation load concentrated portion of the seven-branch member is hardened. Reinforcement treatment method.