美国Briggs & Stratton公司每年大批量生产割草机,扫雪机以及工业/商业发动机.这些发动机的曲轴是用延性铸铁制造的。从粗糙的铸铁锭到光洁的曲轴,需要切除大量的材料。例如,3.5马力的发动机曲轴需从锭坯上切除1/4时材料。以前是以车削作为材料切除初始工序,而后进行粗磨和精磨直到获得所要求的尺寸和光 The United States Briggs & Stratton company mass-produce lawn mowers, snowplows and industrial / commercial engines each year.The crankshafts of these engines are made of ductile iron. From rough cast iron ingots to smooth crankshafts, a large amount of material needs to be cut off. For example, an engine crankshaft of 3.5 horsepower requires cutting 1/4 of the material from the billet. In the past, turning was used as a material removal initial process, followed by roughing and finish grinding until the desired size and light were obtained