Prodn. of impact-absorbing beam for e.g. car - by placing lightweight core with foaming cover in metal sections, welding them, and hot dip coating to foam up cover, and fill remaining spaces

摘要

A beam component is produced by enclosing a lightweight core in a hollow metal body made up of profiled sections hot bonded together, the core being present to raise the mechanical strength. This core has a covering of hot-foaming material; localised changes in the section of the core and/or outer body form spaces between them; the two are then combined together using those spaces for thermal insulation by hot dip-coating which causes the cover material to foam up and fill the spaces. ADVANTAGE - For beam to absorb kinetic energy, e.g., for a vehicle. Its prod. increases stiffness and/or buckling strength in a crash, and does so by welding assembled hollow beams. It avoids damage to the core. It uses minimum number of stages in producing a load-transmitting connection between the lightweight core and hollow beam.