FIELD: study of plastic properties of hard materials by application of loads to them. SUBSTANCE: magnitude and type of deformation on hard to stamp parts in zones critical by deformation are determined. Relation of diameters of ellipse hole of die is selected by appearance of deformations. Forming part of die is chosen depending on magnitude of deformation in critical zones. Samples are extracted by manufactured die. Metal is rejected if cracks and thinning are detected. EFFECT: optimized technology of rolling of sheets for complex parts. 2 cl
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