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Since the advent of machinery, there have been corresponding mechanical parts. But as a discipline, mechanical parts are separated from mechanical construction and mechanics. With the development of the machinery industry, new design theories and methods, new materials, and new processes appear, and mechanical parts have entered a new stage of development. Finite element method, fracture mechanics, elastic hydrodynamic lubrication, optimization design, reliability design, computer-aided design (CAD), solid modeling (Pro, Ug, Solidworks, etc.), system analysis and design methodology and other theories have gradually been used in the research and design of mechanical parts. Cast iron and steel are iron-carbon alloys, and their difference mainly lies in the difference in carbon content. An iron-carbon alloy with a carbon content of less than 2% is called steel, and an iron with a carbon content greater than 2% is called cast iron. Cast iron has proper fusibility and good liquid fluidity, so it can be cast into parts with complex shapes.
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