Theoretical and experimental study of the wear factor for a diamond stone-cutting tool

Abstract

Results are provided for a study of the wear factor in cutting Kursebi deposit teshchenite with a diamond cutter segmented wheel 1250 mm in diameter made of SAM 500/400 diamonds. Analysis shows that diamond consumption varies within considerable limits. For wheels with a diameter of 500-1250 mm, the maximum consumption reaches 0.9-1.5 carat/m 2 . where H m is weighted mean rock-forming mineral microhardness, N/m 2 ; and P p is rock punch hardness, N/m 2 . Abrasiveness is the capacity of machined material to wear a stone-cutting tool. During cutting with a diamond tool, the abrasive properties develop as wear of diamond grains due to their wearing away with friction over the rock and break- ing bonds, to which the diamonds are fastened, as a result of the action of broken material particles upon them. Therefore, the wear factor, specifying the capacity of rock to wear a diamond tool as a whole, should reflect both the abrasive proper- ties of the unbroken mass, and the abrasive properties of rock particles already dispersed. The abrasiveness factor is taken as this index: R a = (H m /P p ) 1/2 . Kursebi teshchenite has the following physical parameters: H m = 450-880 N/m 2 , P p = 150-300 N/m 2 , R a = 1.8-2.0, and Q = 300-400 N/m 2 . A diamond cutter segmented wheel has been developed that consists of steel body, made in the form of a flat disk, and diamond segments fastened to it whose diamonds break the material being machined. The segments consist of diamond (Sd) and diamond-free (S-Sd) layers, and the latter is necessary in order to provide the required strength of segment fasten-