| 摘要 |
<p>A pattern for a casting process machined from a billet material according to a basic, programmed, five-axis machining process to form multiple copies of a reproducible complex pattern body (18). Machining the complex patterns (18) and producing variations by changing the machine program permit multiple bit patterns of variable forms to be produced without need for building an intermediate, reusable pattern mold that would require multiple mold pieces. The pattern is machined in a single chucking operation in a machine tool (26) adapted for machining plastics in a three-dimensional global process. Bit patterns formed in the process have forward canted blades (35) that are machined from mating planar surfaces to simplify the machining process. Forward canting makes the blades (35) stronger and thus permits the blades (35) to be thinner than non-canted blades to increase the clearance between blades (35), which improves the movement of cutting past the bit.</p> |
