Abstract: A method for manufacturing a core plug from a core blank having an outer rim, a top surface and a bottom surface. The method comprises positioning the core blank into a stamping apparatus. Subsequently, a recess is stamped into the outer rim of the bottom surface of the core blank. Next, the bottom surface of the core blank is positioned in a blank accepting region of a second die member of a core die formation apparatus. The core blank is then propelled through an opening extending through the second die member, and, the outer rim is deformed inward and upward, thus forming the core plug. The deformation does not affect the recessed region of the resulting core plug. The invention additionally comprises a core plug manufactured by the foregoing method and a core die formation apparatus used in conjunction with the method.

Abstract: A method for manufacturing a core plug from a core blank having an outer rim, a top surface and a bottom surface. The method comprises positioning the core blank into a stamping apparatus. Subsequently, a recess is stamped into the outer rim of the bottom surface of the core blank. Next, the bottom surface of the core blank is positioned in a blank accepting region of a second die member of a core die formation apparatus. The core blank is then propelled through an opening extending through the second die member, and, the outer rim is deformed inward and upward, thus forming the core plug. The deformation does not affect the recessed region of the resulting core plug. The invention additionally comprises a core plug manufactured by the foregoing method and a core die formation apparatus used in conjunction with the method.