Controlled nozzle cooling (CNC) of permanent mold casting
OwnerQingyou Haninventor
Life of this patent
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Abstract
A process for permanent mold casting of metals and their alloys includes the steps of providing at least a mold equipped with a plurality of cooling nozzles, making a layer of coolant permeable materials covering the nozzles and maintaining the materials at desired temperatures, delivering a molten metal into the mold, supplying predetermined amount of coolant to each nozzles to contact the external surface of the casting at desired rate, time, and duration to achieve an acceptable level of progressive solidification from the distal end of the casting towards the riser until the casting has reached desired temperatures.
Claims18
A process for casting of metals to maintain an acceptable level of progressive solidification from a distal end of a casting to its riser or its downsprue, comprising the steps of:
- preparing permanent or semi-permanent molds with a plurality of nozzle holes spaced at predetermined intervals;
- lining the molds with a coolant permeable liner composing of at least an aggregate to form a cavity for castings and a plurality of nozzle holes spaced at predetermined intervals, each hole for hosting a cooling nozzle with a tip of the nozzle separated from a surface of the casting by a thin layer of coolant permeable materials;
- preparing a plurality of venting systems in the molds and the liner to release used fluids, moisture and mold debris;
- holding at least part of the mold or the liner at predetermined temperatures;
- introducing a molten metal into the mold cavity to form castings;
- embedding nozzles into the nozzle holes in the at least a permanent or semi-permanent mold with the tip of each nozzle separated from the surface of the casting by a thin layer of coolant permeable materials;
- delivering a predetermined amount of a selected coolant including water to the tip of each nozzle at predetermined rates, times, and durations to break the thin layer of coolant permeable materials in order for the selected coolant to directly contact external surface of a solidifying casting to cool the solidifying casting sequentially;
- and
- cooling the casting under controlled conditions to predetermined temperatures before removing the casting out of the mold.
Dependencies are inferred from the claim text.