The invention discloses a production technology of an aluminum
alloy sectional bar for an automobile bumper and belongs to the technical field of
metal machining. The aluminum
alloy sectional baral bar for the bumper is processed through the steps of mixing, melting, permanent magnetic stirring,
temperature measurement, sampling, ingredient and temperature adjustment, turning down, refining(first purification), standing still, online addition of Al-Ti-B wire, online removal of gas and sand (secondary purification), two-stage
filtration, same-level hot top
casting, cast
ingot homogenization,
machining of cast
ingot, inspection of cast
ingot, heating of cast ingot by an
induction furnace,
extrusion, precise on-line
quenching, stretching and straightening, aging, structure and property inspection of sectional bars, and delivery. The aluminum
alloy sectional bar processed by the technology is excellent in
thermal deformation performance, and high in strength due to on-line
quenching during
extrusion. The product has excellent
welding performance and
corrosion resistance, certain resistance to stress
corrosion, and especially has strong shock absorption and folding resistance.