Aluminum Alloy Plate For Hood Inner Panel Of Automobile And Manufacturing Method Thereof

Abstract

PURPOSE: An aluminum alloy plate for a hood inner panel of an automobile is provided to regulate less than 0.5% of Fe (however, 0% is included), less than 0.5% of Zn (however, 0% is included), less than 0.1% of Cu (however, 0% is included), less than 0.5% of Mn (however, 0% is included), less than 0.5% of Cr (however, 0% is included), less than 0.3% of Zr (however, 0% is included), and less than 0.1% of Ti (however 0% is included) among inevitable impurities. CONSTITUTION: An aluminum alloy plate for a hood inner panel for an automobile comprises 0.4-1.5% of Si and 0.2-1.0% of Mg by mass. The aluminum alloy plate for the hood inner panel is Al-Mg-Si group aluminum alloy plate comprised of Al and an inevitable impurity of a remainder. A property of the aluminum alloy plate after an artificial ageing hardening process of 170°Cx20 minutes after 2% of a pre-strain is 80-160 MPa of 0.2% internal force. In a molded vehicle hood inner panel, a head injury criterion value given with an FEM interpretation to a relative formula of a maximum value of a multiplication of a generation time and 2.5 multiplication of an average acceleration within an arbitrary time is less than 1000 mm / s^2. A difference of a tensile strength of the aluminum alloy plate and the 0.2% internal force is less than 70 MPa. [Reference numerals] (AA) Outer; (BB,GG) Hinge R / F; (CC) Inner; (DD) Striker; (EE) Front of a vehicle; (FF) Hitting point

Description

[0001] This application is a divisional application of the application number 201310044020.4, the application date is February 04, 2013, and the invention title is "Aluminum alloy plate for the inner panel of the engine hood of the automobile". technical field [0002] The invention relates to a method for manufacturing an aluminum alloy plate for an inner panel of an automobile engine hood and the aluminum alloy plate. [0003] The aluminum alloy sheet referred to in the present invention is a sheet subjected to heat treatment (tempering treatment) after cold rolling, that is, an aluminum alloy sheet before forming an automobile hood inner panel by press forming. Furthermore, in the following description, aluminum is also called Al. Background technique [0004] In recent years, pedestrian protection in automobile accidents has been regulated, and the pedestrian protection performance is also used as an index for evaluating the hood (also called bonnet) for automobiles. On...

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Problems solved by technology

[0017] However, the yield strength becomes high due to the heating during such a relatively low-temperature coating and sintering treatment. If the strength is too high, the reaction force when the head of a pedestrian hits becomes large, causing damage to the head, and there is an impact caused by the head collision. The problem that (energy) absorption performance does not increase

As a result, the hood inner panel itself made of 6000 series aluminum alloy cannot meet the standardized head injury value (HIC value)

[0018] However, only lowering the yield strength has the following problems: the head injury value is not satisfied, and other required properties as the hood inner panel of the automobile, such as handleability and formability, cannot be satisfied.

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