DOUBLE-STAND UNIT OF THREE-ROLLER STANDS Russian patent published in 2000 - IPC

FIELD: plastic metal working, namely apparatuses for drawing. SUBSTANCE: double-stand unit includes foundation with struts. Roller holders with non-driven rollers and mechanisms for individual and group-type radial adjustment of rollers are rotatably mounted with mutual inclination angles equal to 120 degrees on said struts. Roller holder is in the form of double-arm lever whose support is jointly mounted in eccentric sleeves. Roller holder is mounted with possibility of additional motion along axis of said joint. Three pairs of mutually parallel flanges with openings for eccentric sleeves are provided in strut of stand and they are inclined one relative to another by 120 degrees. There are rectangular windows between said flanges. Mechanism for radial group-type adjustment of roller includes heavy hollow screw and massive nut engaging with screw. Casing with three jointly secured metallic plates is clearance-fit mounted on nut. Each plate is jointly connected with roller holder. Roller bearing assembly is mounted on sleeve in double-stand unit of three-roller stands. Struts of stands are mutually joined by means of four braces. Lower braces are secured to foundation of double-stand unit. EFFECT: lowered size and mass of double-stand unit, enhanced accuracy of drawn section due to axial adjustment of rollers, elimination of axial clearance in roller set. 4 cl, 7 dwg