Method of drawing an axial tube made of aluminum material and a cowl cross bar manufactured using same
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United States of America
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Jan 28, 2025
Grant Date -
Jun 1, 2023
app pub date -
May 26, 2022
filing date -
May 26, 2022
priority date (Note) -
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Abstract
A method of drawing an axial tube made of an aluminum (Al) material for a cowl cross bar includes performing NaOH etching on an extruded pipe having a single diameter and made of an Al alloy and performing high frequency heat treatment on the extruded pipe to increase a tube reduction ratio of the extruded pipe. The cowl cross bar is manufactured having a large diameter section and a small diameter section have a difference in diameter, due to a tube reduction ratio, of 40% by a diameter reduction section. Therefore, even when an Al alloy is manufactured as the axial tube having different diameters, the occurrence of cracks is prevented.
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