Abstract: Apparatus for making a spindle-type body with at least one eccentric zone from a semi-product of circular cross-section by gradually radially displacing the eccentric zone of the semi-product to bring its eccentricity from zero to the desired value. The apparatus includes a multi-part die with shaping jaws providing a semi-product shaping passage therein, the semi-product being thrust axially into the die while the semi-product and the die rotate relatively to each other.

Abstract: An improved contoured orifice configuration in the interior of a forming die for manufacturing elongated twist bodies of non-circular cross-section is described. A prescribed interior portion of the orifice in the die is formed with a cross-section corresponding to the cross-section of the body. The portion of the orifice upstream of the interior forming section is similar to the interior cross-section but increases along a spiral path that terminates at the upstream end surface of the die. A localized region of the orifice immediately upstream of the interior portion extends generally tangentially to the angle of twist of the twist body.