Patent ID: 6418889
Filing Date: 2002-07-16
Classification: B22C,F02B,F02F,Y10T

Abstract:
A method for producing a closed deck cylinder block having a top deck surface and formed with a plurality of cylinders juxtaposedly arranged to each other and a water jacket portion surrounding the plurality of cylinders, the water jacket portion having an opening opened at the top deck surface of the cylinder block, and the opening being partly closed by bridge portions, the opening having an area ratio of from 10 to 30% of a projection area of the water jacket portion at the top deck surface, the method comprising the steps of:molding a water jacket core, so as to provide the opening having the area ratio of from 10 to 30% of the projection area of the water jacket portion at the top deck surface, with a mold material in a free flowability comprising a refractory aggregate, a curable organic binder containing as a requisite component polyfunctional acrylamide having at least two ethylenically unsaturated groups in one molecule, and at least one metal oxide selected from the group consisting of iron oxide and copper oxide; forming a coating layer over the molded water jacket core; setting the coated water jacket core in a metal mold and injecting a molten metal into the metal mold to produce a cylinder block product by die-casting; and discharging waste sand converted from the water jacket core from the cylinder block product only by shaking the cylinder block product.