Tungsten Carbide Indexable Inserts Precision Choosing

The national standard GB/T2076 – 1987 has stipulated twelve grades of precision towards tungsten carbide indexable inserts, which include A, F, C, H, E, G, J, K, L, M, N, u and so on.

G, M, u grades are normally adopted in turning machining, among which, G grade is of the highest precision, and M grade takes the second place, while U grade of the lowest precision. Obviously, during high precision machining, low precision blade can not be used, or it will affect the machining precision and quality of workpieces. Therefore, the precision of tungsten carbide indexable inserts should be chosen according to the precision requirements of the workpieces being processed. Principles below should be followed during the choosing.

I.    Blades of G grade should be adopted during the finish machining and semi-finish machining of non ferrous metal materials and in the finish machining of quenched steel.
II.    Blades of M grade should be adopted during finish, semi-finish, rough, and heavy cut machining except the two cases above.
III.    Blades of u grade can also be adopted in the rough and heavy cut machining.
IV.    The precision of indexable inserts used in automatic production lines should be higher than that in the common machining.
V.    If there are tool setting gauges, it can be not so strict with the blade precision choosing.

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