Machinery's Handbook, 31st Edition
1292 GRINDING WHEELS where the use of a single type of wheel for both soft and hardened steel materials is considered more important than the selection of the best suited types for each condition of the work materials, Table 5 lists “All Around” wheels in its last column. For applications where cool cutting properties of the wheel are particularly important, Table 6 lists, as a second alternative, porous-type wheels. The sequence of choices as presented in these tables does not necessarily represent a second, or third best; it can also apply to conditions where the first choice did not provide optimum results and by varying slightly the composition of the grinding wheel, as indicated in the subsequent choices, the performance experience of the first choice might be improved. Table 3. Classification of Tool Steels by their Relative Grindability Relative Grindability Group AISI-SAE Designation of Tool Steels GROUP 1—Any area of work surface W1, W2, W5 S1, S2, S4, S5, S6, S7 High grindability tool and die steels O1, O2, O6, O7 (Grindability index greater than 12) H10, H11, H12, H13, H14 L2, L6 GROUP 2—Small area of work surface H19, H20, H21, H22, H23, H24, H26 ( as found in tools ) P6, P20, P21 T1, T7, T8 Medium grindability tool and die steels M1, M2, M8, M10, M33, M50 (Grindability index 3 to 12)
D1, D2, D3, D4, D5, D6 A2, A4, A6, A8, A9, A10
T4, T5, T6, T8
GROUP 3—Small area of work surface
( as found in tools )
M3, M6, M7, M34, M36, M41, M42, M46, M48, M52, M62
Low grindability tool and die steels (Grindability index between 1.0 and 3) GROUP 4—Large area of work surface (as found in dies)
D2, D5
A11
All steels found in Groups 2 and 3
Medium and low grindability tool and die steels (Grindability index between 1.0 and 12) GROUP 5—Any area of work surface
D3, D4, D7 M4
Very low grindability tool and die steels
A7
(Grindability index less than 1.0)
T15
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