Casting occupies a large proportion of mechanical products. For example, the weight of castings for tractors is about 50-70% of the weight of the whole machine. There are 40-70% castings in agricultural machinery, and 70-90% in machine tools and internal combustion engines.
Among all kinds of castings, mechanical castings have the most varieties, the most complex shapes, and the largest amount, accounting for about 60% of the total casting output.
