US 5,292,352 AGranted

Method for grinding plastics or glass

AssigneeC. & E. Fein GmbH

InventorsBoris E. Rudolf, Horst Moissl

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Abstract

The invention proposes a method for grinding plastics or glass, in particular for grinding acrylic glass, where a mechanically driven grinding tool is moved across a surface to be finished (44). Grinding is effected by a dry process, without any liquid working agent, the grinding tool performing an orbital movement, or oscillating about a fixed rotary axis at high frequencies, while the grinding dust is extracted from the marginal area. The grinding tool comprises a closed abrasive with resiliently embedded abrasive grains, a plurality of the resiliently embedded abrasive grains having, preferably, level front surfaces which are delimited by relatively sharp edges at the transition to their lateral surfaces, the greatest part of the front surfaces being oriented to extend substantially in parallel to the surface to be worked (44). The method enables plastic and glass surfaces to be micro-finished to a particularly high grade (FIG. 1).

Claims10

Dependent claims

A dry method for treating the surface of a transparent acrylic glass with an abrasive, comprising the steps of:

moving a mechanically driven grinding tool across said surface of transparent acrylic glass, said grinding tool performing at least one of an orbital movement and an oscillating movement about a fixed rotary axis and using a dry abrasive without any liquid working agent, said abrasive comprising abrasive grains held resiliently on a carrier that is removably attached to said grinding tool;
extracting, from a marginal area of said grinding tool, grinding dust arising from the movement of said abrasive across the transparent acrylic glass surface;
controlling the speed of the grinding tool such that the average speed of the abrasive grains relative to the surface of transparent acrylic glass is in the range of two to twenty meters per second;
and
controlling the contact pressure between the grinding tool and the surface of transparent acrylic glass such that a surface temperature of approximately 50.degree. Centigrade is not exceeded.

2 more elements

Dependencies are inferred from the claim text.