DEBURRING & FINISHING
from 1.2 mm to 3/8" (9.5 mm) and are capable of deburring hole diameters from 1.3 to 51 mm. Typical applications in- clude hydraulic manifolds, fittings, elbows, camshafts, crank- shafts, and connecting rods, as well as large oil field parts.
Sandblasting Small Parts Where Nanometers Matter As today’s manufacturing processes enable the fabrica- tion of smaller and more intricate parts, traditional deburr- ing methods, using hand tools to carefully remove burrs, may no longer be adequate. Micro- abrasive blasting, or MicroBlasting, which is a subset of the larger grit blasting industry, effectively removes fine burrs on complex geometries without causing dimensional changes to the part. The process can be used on a wide range of applications in- cluding precision deburring, controlled erosion, surface texturing, selective cleaning, and shot peening. “We do a lot of work with
aerospace, medical, electronics, semiconductor, artisan/museums, and industrial controls for applications that are smaller, more fragile, and higher value and more susceptible to damage,” said Colin Weightman, president, Comco Inc. (Burbank, CA). “We take some of the attributes of the sandblasting process and shrink it down to the point where we are focusing a fine stream of abrasives at very high velocities in the 100–200 m/sec range, almost two-thirds the speed of sound to strike the surface. The abrasive fractures on impact, changing size and physical properties so rather than using a shotgun approach we use a machine gun approach of delivering a very accurate abrasive stream,” said Weightman. Selecting the right type of abrasive, nozzle size, and air pressure to quickly cut off fine burrs for the application is critical. “We work with everything from very hard cutting abrasives to very soft cleaning abrasives—from the harshest to the most gentle—from silicon car- bide, aluminum oxide, crushed glass, glass beads to walnut shells, plastic media, and sodium bicarbonate. The
See us at SOUTH-TEC Booth #1740 70
AdvancedManufacturing.org | October 2015
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