| 摘要 |
This invention relates to a method of making a sand mould (1) for casting at least one piston ring blank. The method comprises the steps of: forming a mixture of sand and a hardening binder, filling a mould jacket (2) with a sufficient amount of said mixture, forming said mixture in said jacket (2) to a desired density and with at least one planar surface, allowing for said mixture to cure, applying an axially rotating cutting device (5) to the mixture in substantially normal direction relative to said planar surface, pressing said axially rotating cutting device (5) into the mixture, moving said axially rotating cutting device (5) in at least a generally cylindrical path, relative to said planar surface, within said jacket for providing a groove (3) between a wall (4a) and a core (4b) of said mixture. |
