SURFACE TREATMENT OF CIRCULAR SAW BLADES

摘要

A carbide-tipped circular saw blade is formed by brazing cutting tips of tungsten carbide to the teeth of a steel blade blank, thereby creating discolora tion on the planar surfaces of the blade adjacent the rim. Substantially the entire surf ace of the blade is sandblasted with blast media to remove the discoloration while generati ng a substantially uniform coloration and texture to the planar surfaces of the blade . User-readable graphics are overprinted upon the blasted surface. The graphics an d the surface appearance of the blasted area are selected to be at a predetermined con trast, and the carbide cutting tips retain a visual appearance different from the rest of the blade, such that the graphics and cutting tips are visually perceptible to a pot ential purchaser at the blade's point of sale. The saw blade surfaces are sandblasted b y jets directed at both sides of the saw blade. The blast nozzles are oriented such tha t the vertical components of force of the jets offset one another. This assists in min imizing the blade warping that would otherwise occur due to the sandblasting operation. In all-sandblasted "softbody" blades, a reduction of 20% in deviation from flatness has been achieved compared to similar blades which are polished and rim-blasted.