FIELD: process engineering.
SUBSTANCE: invention relates to metallurgy. Stretching job us performed including grip of the bowl with sidewall and bed made integral therewith. Note here that said bowl is made of metal sheet. Then, one of circular areas of one wall or both walls is squeezed to make a closed section including a part of or all bed to be deformed within said closed section to increase surface area and to decrease bed thickness. Circular squeezing is intended for limitation or prevention of metal flow from squeezed area into closed section at stretching. Then, bowl stretching is performed to stretch and displace metal from stretched and thinned bed. Drawing is intended for tensioning and displacement of material of stretched and thinned bed to sidewall for make said bowl of lower weight.
EFFECT: decreased bowl bed depth relative to material input size.
15 cl, 20 dwg, 1 tbl
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