EXPANDING MANDREL Russian patent published in 1995 - IPC

FIELD: mechanical engineering. SUBSTANCE: base 1 has mounting conical tail 2 on one of its ends and on another end - threading part 3, near which there is expanding cone 4, used for detachable expanding elastic ring 5 mounting on it. Ring 5 is made stepped and has three steps: "a" and "b" side steps are of equal length, "c" middle step - is protruding outside over side butt and is made less than length of mounted blanks. Stepped ring 5 has uniformly located along its perimeter longitudinal H-shaped closed slits 6 with location of parallel components "e" of the slits on "a" and "b" side steps of ring. H-shaped slits form elastic beams 7 on "a" and "b" steps. Ring 5 is moved on conical step 4 by pressing but 8 through easy changeable washer 9. After blank 10 is mounted on "c" middle step of ring 5 nut 8 is turned tight. In the case, thrust through easy changeable washer 9 is transferred on ring 5, that slides by its conical hole on conical step 4 of rod base 1 and is unclasped by "c" middle step with mounted on it blank 10, that at the instant is being centered in respect to axis of mandrel and is clasped unmovingly on "c" step of ring 5. EFFECT: expanding mandrel allows to machine outer surface and butts of blanks with central hole for one set on lathe. 3 dwg