US 5,019,196 AGranted

Sand muller bowl liner

AssigneeCMI International, Inc.

InventorsKenneth D. McKibben, Thomas E. Wuepper

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Abstract

A thin wall liner is positioned within the circular bowl of a sand muller to overlay the interior mulling surface upon which foundry sand is placed and is mulled by a plow blade that rotates within the bowl over its mulling surface. The bowl surface is annular and ring-like in shape. The liner is formed of a number of similar segments which are arranged together in edge to edge relationship to form an annular, ring-like cover over the bowl surface. The liner segments are secured to the bowl by bolts which extend through aligned holes in the segments and in the bowl. Most of the outer surface of the liner is spaced a short distance from the bowl surface by means of thin pads formed on the outer surface of the liner, around the area of the bolt holes. The pads contact the bowl surface, to provide a space between the remainder of the liner and the bowl surface. This space is filled with a grout-like material for bonding the liner to the bowl and for shock absorbing and load distribution. The liner is formed of a hard material which is much more wear resistant than the bowl to permit extended use of a worn bowl or to extend the life of an unworn bowl.

Claims8

Dependent claims

A method for lining the interior wear surface of a sand muller bowl having an interior, generally horizontally arranged, generally circular face for supporting sand and over which a muller plow blade travels for mulling such sand upon said face, and having an integral, outer edge, upstanding rim portion substantially surrounding such face for containing the sand upon the face, comprising the steps of:

preparing a thin wall liner to overlay and cover substantially all of the muller bowl interior face and the interior surface of the rim portion around the face, with the liner having an inner surface and an outer surface which are formed in substantially the same size and shape as the bowl face and rim portion for closely fitting within the muller bowl and for providing an inner surface for supporting and mulling sand;
positioning the liner within the muller bowl, with a major portion of the liner exterior surface being spaced inwardly, away from the muller bowl face, but with means for supporting the liner upon the muller bowl face to provide a roughly uniform, narrow in cross section space between the bowl face and the liner inner surface;
filling the space with a material which bonds together and forms a load absorbing layer between the liner outer surface and the bowl face;
whereby the liner may be positioned within a worn muller bowl or an unworn muller bowl for extending the useful lives thereof.

1 more element

Dependencies are inferred from the claim text.