DRILLING METHOD AND DRILLING MACHINE TOOL Russian patent published in 2004 - IPC

FIELD: machine engineering, namely working graphite casting molds for wheels of railway road transport vehicle.

SUBSTANCE: method comprises steps of using machine tool having table; supporting plate secured to it; indexing disc mounted on supporting plate with possibility of rotation around predetermined axis together with blank placed in it; member for fixing indexing disc engaged with protruding band of indexing disc; spindle drive unit mounted in cantilever type bracket with possibility of drilling first opening in first predetermined place of blank and after rotation of indexing disc with blank drilling (without motion of spindle drive unit) second opening in second predetermined place of blank. First and second openings are spaced by the same distance from blank center. In order to simplify drilling process, fixing member of indexing disc is provided with group of openings. Predetermined openings of said group may be coincided with predetermined mounting openings of indexing disc for drilling in blank target number of openings mutually spaced by the same interval and spaced from blank center by desired distance.

EFFECT: decreased labor consumption of drilling process.

3 cl, 10 dwg