DIE SET FOR DRAWING BODY PARTS Russian patent published in 1997 - IPC

FIELD: all branches of machine engineering; part drawing of sheet materials; particularly, complex-shape parts of motor vehicle body in motor industry, agricultural industry branch, domestic appliances. SUBSTANCE: die set for drawing body parts includes punch, die, die insert and holder. Clamping surfaces of die and holder have slopes in zones needing additional effort for braking motion of blank flange. Slopes of clamping surfaces are in the form of pieces of straight lines forming with clamping surfaces of die and holder angles equal to 15-25 degrees or in the form of circle arcs with radius values equal to (8.5-10)So, where So is initial thickness of blank, or in the form of hyperbolic curves. EFFECT: lowered rolled sheet consumption due to reduced technological allowances for holder surfaces and decreased time periods of die set adjustment. 6 dwg