CZ409698A3 - Process for producing shock-absorbing structural part of motor vehicle, - Google Patents

Abstract

The invention relates to a method for producing a component designed to transform impact energy in a motor vehicle, wherein a starting material which is initially heated to forming temperature is shaped in the form of a profiled bar, which is then divided into impact-absorbing elements (3) as required. This procedure enables rational and economical production of the impact-absorbing elements (3). Practically all desired geometrical designs for an impact-absorbing element (3) can be realized depending on specific vehicle requirements. Connecting holes (5) to fix the impact-absorbing element (3) to the vehicle are produced during pressing. The impact-absorbing element (3) has hollow cavities (7, 8) and inner braces (11, 12), thereby enabling considerable weight reduction while preserving functional impact-absorbing capacity of the impact-absorbing element (3).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a component for motor vehicles for converting impact energy.

Background Art

DE 43 00 284 A1 discloses a prior art component of a motor vehicle for converting the impact energy transmitted to the motor vehicle upon impact. Such an impact energy absorber is. as a safety member incorporated between the bumper and the chassis of the motor vehicle. The shock absorber consists essentially of two tubes concentrically inserted into β. Both tubes are dimensioned so that they * slide into each other upon impact and impact energy h

it converts by deforming the tubes.

Because of their weight, but above all because of production costs, such shock absorbers are considered disadvantageous.

In principle, engine components are subject

76607 and 76607a rinr-l * vehicles, such as chassis and body parts, to the highest requirements in terms of their strength and load behavior. Because they are exposed to extreme static and dynamic operating loads, they must meet high safety standards. At the same time, it also strives to design motor vehicle components as lightly and rationally as possible. By reducing weight, material consumption, motor vehicle consumption and pollutant emissions can be reduced.

SUMMARY OF THE INVENTION

The object of the invention is therefore, based on the state of the art, the task of rationalizing the production and the overall economy of producing shock absorbing components for motor vehicles.

According to the invention, this object is achieved by the features set forth in the characterizing part of claim 1. Accordingly, the starting material heated to the deformation temperature is first formed into a profiled blank and is subsequently subdivided into impact elements as desired.

Various materials may be used as starting material. Due to their low specific weight and strength properties, aluminum, aluminum alloys, manganese, titanium or plastic are offered.

AlMgSi alloy is considered to be particularly preferred. The

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9 9 · 99 enables high pressing speed and complicated profiles, especially hollow profiles with low wall thickness. It also has very good corrosion resistance.

Also, aluminum-lithium alloys contribute to the desired weight loss due to their low bulk density. With aluminum-lithium alloys that have a Li content around _? 2.5%, a volume reduction of almost 10% is achieved.

At the same time, the modulus of elasticity is increased by about 10%, which further reduces the weight of the component.

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It is also possible to use multilayer materials in which the fibers are fused into an aluminum matrix.

The method according to the invention enables the rational and economical production of impact elements for motor vehicles having a high degree of impact energy conversion capability.

The impact elements are simple to design and can be adapted to the requirements of the vehicle and the requirements of the motor vehicle.

i In principle, connection holes can be made to fix the impact elements in the vehicle after their manufacture. In particular, the connection holes are advantageously produced in the molding of the profiled workpiece as proposed in claim 2. This results in a further rationalization of production.

According to the features of claim 3, a profiled blank with hollow spaces and internal reinforcements is pressed. In this way, the mass of the components of the motor vehicle may be

7CCn7 / 7CCn7'J '; It is considerably reduced and the ability to absorb energy, respectively. the ability to convert energy increases. In addition, the strength of a motor vehicle component may be adjusted as desired.

The method according to the invention allows the production of impact elements in only two main working operations. Overall, motor vehicle components are manufactured rationally and thus not very costly. The saving of weight compared to steel tube construction allows further reduction of the total weight of the motor vehicle. This contributes to reducing the consumption of motor vehicles and reducing pollutant emissions.

The shape and design of the impact elements may be functionally adapted in a simple manner to specific requirements of the type of motor vehicle, for example with regard to the energy storage capability, the geometry requirements and the static load capacity. Ability to capture the force, respectively. The impact strength can be determined by internal reinforcements, honeycomb structure or wall thickness variations. geometry changes.

Overview of pictures in drawings

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be explained in more detail with reference to the drawings, in which: FIGS.

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DETAILED DESCRIPTION OF THE INVENTION 1

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Figures 1 and 2 show two embodiments of the component 1 and 2 respectively. 2, for the transformation of impact energy in motor vehicles, in the form of impact elements 2, respectively. A, separated from the molded profiled blank.

In production, the starting material was first heated to the forming temperature and pressed to a profiled blank.

The longitudinal span of the preform is indicated by the arrow L on the component.

In the subsequent operation, the profiled blank * is divided into impact elements of appropriate dimensions as required.

Connection holes 2, 6 for fastening the impact elements 2,

And in a motor vehicle, they were made while molding a profiled blank; -,. ·. - λ

Impact elements 2, A have hollow spaces 7-10 and internal reinforcement 1.1-14. This reduces the weight of the impact elements 2, A and increases the energy absorption capacity. The reinforcements 11-14 guarantee sufficient specific strength with respect to the vehicle.

The production of the impact elements 2, A according to the invention is possible rationally with only two main operations. This results in high time and cost savings. With the method according to the invention, impact elements of different configurations with high energy absorption capability can be produced with a low weight compared to known motor vehicle components.

Claims (3)

Method for manufacturing a component for the conversion of impact energy in motor vehicles, characterized by: This is characterized in that the starting material heated to the deformation temperature is first formed into a profiled workpiece and this is then subdivided into impact elements (3, 4) as required. Method according to claim 1, characterized in that the connection openings (5, 6) for fastening the impact elements (3, 4) in a motor vehicle are made by molding the profiled blank. Method according to claim 1 or 2, characterized in that the profiled blank is pressed with hollow spaces (7-10) and internal reinforcements (11-14).