Casting applications have a long history. Ancient people used castings and some living utensils. In modern times, castings are mainly used as blanks for machine parts, and some precision castings can also be directly used as parts of machines. Castings account for a large proportion of mechanical products. For example, in tractors, the weight of castings accounts for 50-70% of the weight of the whole machine, 40~70% of agricultural machinery, and 70~90% of machine tools and internal combustion engines. Among all kinds of castings, the most used castings are mechanical, the shape is the most complicated, and the amount is also the largest, accounting for about 60% of the total casting output. This is followed by steel ingot molds for metallurgy and pipes for engineering, as well as some tools in life.
Castings are also closely related to daily life. For example, door handles, door locks, radiators, water pipes, iron pans, gas hobs, irons, etc., which are often used, are castings.
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