In the same material(40Cr)Under similar external conditions,Researchers compared flange forgings manufactured by forging and free forging。The results show,Mold forgings are filled with cavities due to the metal's three-dimensional compressive stress state,The residual stress distribution is more uniform and the concentration value is lower by about30%;However, free forgings suffer from uneven deformation,Surface residual tensile stress area is wider,Not conducive to subsequent processing deformation and fatigue life。This study suggests that during the product design phase, forging methods should be selected more scientifically based on the stress characteristics of the parts,Not just based on cost considerations。
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