Die cooling pipe

Claim 1

A die cooling pipe for use with a die having a cooling hole therein, said die cooling pipe comprising a hollow pipe which includes a sidewall and which defines opposite first and second ends, said second end being uncovered, said hollow pipe also including a water intake hole in said sidewall near the first end thereof, a single integral baffle which extends axially within said hollow pipe from said first end thereof to said second end thereof, said baffle dividing said hollow pipe into an axial forward water channel and an axial backward water channel, said hollow die pipe and said baffle being integrally formed by extrusion forming, a water stopper fixedly attached to said first end of said hollow pipe, said water stopper including a main portion, an integral water inlet nozzle extending away from said main portion and an integral water outlet nozzle extending away from said main portion, said water stopper including a water inlet passageway which extends through said water inlet nozzle and communicates with said water intake hole in said sidewall of said hollow pipe and a water outlet passageway which extends through said water outlet nozzle and communicates with said backward water channel in said hollow pipe, and a seal means extending around the sidewall of said hollow pipe, said die cooling pipe being insertable into the cooling hole in said die so that cooling water which has passed through said water inlet passageway, through said water intake hole and along said forward water channel will flow out said second end of said hollow tube and into said cooling hole to cool said die, then flow into and along said backward water channel and through said water outlet passageway.