Grinding ratio (GR) is calculated as the ratio of weight loss of material to the weight loss of abrasive wheel for a specific grinding time.
1.49 3.92 Table 4: Speed test results Type of Material Breaking Point Allowable (rpm) Speed (rpm) L bond wheel 10500 6875 H bond wheel 11500 7625 Type of Material Material Loss Wheel Loss Grinding Ratio per Hour (g) per Hour (g) L bond wheel 19.8 0.6 33 H bond wheel 22.2 0.4 55.5 Type of Material Surface Finish Ra([micro]m) L bond wheel 0.527 H bond wheel 0.472
Although it can be ground with pure silicon carbide wheels, the grinding ratio
is very low and the material is easily damaged.
Although performance was outstanding, when compared with conventional aluminum oxide wheels with respect to grinding ratio and form holding capabilities, it needed its own bond formulations to be optimized for the "chip" producing process of steel grinding.
The grmndability of various materials can vary greatly from one material to the next and can be measured by means of the grinding ratio, "G" (volumetric ratio of material removed divided by the volume of grinding wheel consumed during the process).
In tests grinding Inconel 718, N-CBN wheels had a grinding ratio
of 4000 at removal rates up to 5000 [mm.sup.3]/mm compared with a P-CBN ratio of 400 and stock removal rate of 1000 [mm.sup.3]/mm.
The grinding ratio
of a CBN wheel can often be as much as 200 times greater than that of an aluminum oxide wheel and, in many cases, after initial wheel preparation, may require no additional maintenance for the life of the wheel.
This grinding ratio
is a comparison point or a measure of efficiency.
has just introduced a new, blue, vitrified polycrystalline diamond grinding wheel, which it says, will reduce grinding times by 30 percent and improve grinding ratios
by 50 percent.
Both diamond and CBN abrasives provided grinding ratios
(G-ratios) well above those of the SiC abrasive: G for the SiC wheel was about 1, while G-ratios for the superabrasive wheels ranged from about 50 for Borazon 560 CBN to more than 150 for GE MBG-II, a medium-tough diamond material.