In barrel finishing or tumbling, workpieces, abrasive particles, and a fluid are tumbled in a slowly rotating container. In vibratory grinding, also known by the trade name “trowalizing”, the container vibrates. The fluid can be water, acid, or alkaline compound [MENA00]. Barrel finishing and vibratory grinding are applied in die and mold manufacturing, medical and […]
Рубрика: Life Cycle and Sustainability of Abrasive Tools
Balancing Methods
Imbalances in rotating grinding tools can be static or dynamic and are caused by excentricity, form errors, or structure errors (Fig. 5.3). Imbalance, U, is defined as the product of the mass, m, that is out of symmetry and the excentricity, e, towards the rotational axis (Eq. 5.7) [KLOC09, p. 284, DIN05]. Standards, such as […]
Measuring, Replicating and Modeling of the Tool Topography
Already in 1936, Goedecke emphasized that the process performance of a grinding tool depends strongly on the spacial distribution of the cutting edges [GOED36, EVER06, p. 383]. Several methods to measure, replicate and model the tool topography exist. Karpuschewski summarizes sensors and methods for measuring the grinding tool microtopography [KARP01, p. 131 ff]. 6.2.2.1 Tactile […]
Dressing Mechanisms
During dressing with diamond tools, the active mechanisms are grit breakage and splintering, bonding breakage, grit break-out of the bonding, and grit deformation [MARI04, WIMM95, MINK88, MESS83, KLOC08b]. For vitrified bonded wheels, dressing forces seem to have a crucial effect on the disruption of the abrasive layer and therefore on the wear behavior after dressing […]
Functional Requirement of Controlling Workpiece Surface Grooves
The workpiece surface profile is defined by the generated surface grooves. A small roughness band needs shallow grooves and small chip thicknesses (Figs. 7.22 and 7.19). Shallow grooves can only be generated when both groove bottom shape and wheel deflection are controlled. The groove bottom is shallow for grits with large cutting edge radius and […]
Slotted Tools
Slotted tools or so-called segmented tools consist of a discontinuous abrasive layer either with geometrically defined or undefined cavities [KIRC10, p. 9]. Grooves can be perpendicular to the wheel perimeter or inclined. The so-called T-Tool wheel consists of a metal bonded, segmented superabrasive layer and can significantly reduce forces and temperatures in SiC grinding compared […]