Promieniowe ścienienie wióra wpływa na zwiększenie wydajności poprzez umożliwienie zastosowania narzędzi skrawających za zwiększonymi posuwami na ostrza w obróbce zgrubnej.
When rough miłling, the goat is to remove as much materia) from the workplene ai possible in the shortest amount of time. The meta)-removai ratę is pnmariy based on a machinę tooTs avaiłable horsepowar. of course, but even on a iow-horsepower machinę, productivity can be maxim<zed and desired cutting condbont maintalned via radia! chip thinning.
Radial chip thinning is the offset of ta king a radia! WOC (a*) iess than 25 percent of the milflng tool's diameter. The chip thickness based on the caiculated fedd per tooth (ft) will dimlnish as the radia) width decreases, rssubng in a lighter aetLial f, Th* causes the tool to rub the workpiece rather than cut it, sa the f, needs to be Increased as the radial depth decreases. The result is a decrease in cycie times and longer tool Hfe.
ifs In the Approach
Wlth chip thinning, the most important aspect is the approach angle of the cutting tool. As the approach angle (Kr) gets flatter, starting at 90* and progressing toward a Iow er value, the chip thickness, or h value decreases.
Based on the different values for the optimal chip thickness when machining a specific group of workpiece materials, the feed per tooth that should be eniered into the CNC program can be caiculated using the following formula:
Th# h v#lu« for a group of matariala i# praaantad «• » ranga, włłh tha iowar numbar bong the etarttog-pomł
Whether the approach angle Is 90°, 60°, 45°, 30° or flatter, the chip thickness wili always be constant (Figurę 1). The exception is the round, or button cutter, Insert, whlch, without any top geometry and a sllght chamfer, provides the strongest edge.
Rys. 1, Kształty przekrojów skrawanych dla narzędzi z różnymi kątami przystawienia, od 90° z lewej do okrągłej płytki z prawej. ap ■ głębokość skrawania; b ■ długość wióra; fx« posuw na ostrze; b ■ grubość wtóra; r * promień; k, ■ kąt przystawiania'.