The Study Of The Infection Of Cutting Usage To Tool Durability In Machining Compacted Graphite Iron

With strict exhaust emission request increasingly, the cylinder header of compacted graphite iron are used more broad in diesel engine. Contrast with machining grey cast iron, tool durability is shortened sharply in machining the cylinder header of compacted graphite iron. To avoid tool failure, small cutting parameter is adopted. That will reduce the producing rate. On the contrary, large cutting parameter will induce frequent tool replacement.For solving this mater, this thesis study coated carbide hard metal drill (6.7mm≤φ≤20mm) to machine the compacted graphite iron, experiment largely with horizontal machining centre, study for the affection of tool durability by changing cutting speed, feed rate and cutting depth, confirm the experiential expressions of the tool durability express with three elements of cutting parameter. The research of optimization of cutting parameters is not only significant to the machining of compacted graphite iron, but also can improve the interrelated theory.This thesis indicates that, with the increase of cutting speed, feed rate and cutting depth, the tool durability of coated carbide hard metal drill decreases, the tool durability decreases most with the increase of cutting speed, more with increase of cutting feed, least with increase of cutting deep. Expressed with dual logarithm coordinate, the tool durability has linear relation with cutting speed/feed/deep. According to the coefficient of linear relation, experiential expressions are gained to better the manufacturing process of compacted graphite iron.