Automatic blowing of long foundry sand cores round mandrels - using cold core box with automatic mandrel extn.

摘要

The core box is closed round a mandrel mounted o a carrier, sand is then blown into the box and the core hardened. The core box is opened, with the simultaneous motion of the mandrel carrier through 90 degrees so the core is located directly above a conveyor fitted with an extractor which draws the core off the mandrel. The core box pref. has a vertical joint line, one half of the box moving horizontally for opening and closing, the carrier being restored to its initial position during closure via a return spring. Alternatively a core box with a horizontal joint line may be used. In one pref. machine, four mandrels are located one carrier moved vertically by a work cylinder to align the mandrels in the core box.