| 摘要 |
A centrifugal rotational countersink reamer for three-dimensional bores, being comprised mainly of an axial screw typed spring and an encircling screw typed spring, the encircling screw typed spring loosely slips over and encircles the threads of the axial screw typed spring, one end of the axial screw typed spring forms a central rod mounted in a cylindrical seat, the countersink reamer is inserted and fixedly mounted on an electric or pneumatic hand tool or a claw on a drilling machine; then the countersink reamer can be inserted into a rough bore, the hand tool is activated to rotate the countersink reamer, thus the axial screw typed spring creates a centrifugal swivelling wiping action during rotation, the threads of the encircling screw typed spring form grinding blades to abrase during rotation rough edges, especially the rough edges in the rough bore or on the three-dimensional interior/exterior bore rims located in a narrow area which makes the rough edges hard to be accessed for grinding. The reamer can solve the technical impediments resided in the conventional grinding and countersink reaming work on three-dimensional interior/exterior bores.
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