METHOD FOR KNURLING INTERNAL GEAR PROFILES Russian patent published in 1998 - IPC

FIELD: plastic metal working, namely knurling internal toothed profiles on tubular parts, particularly at restoring them. SUBSTANCE: method comprises use of worn part as blank 2 with uniform thickness t of fused layer 3 on its outer surface 1. Thickness t is directly proportional to sum l of wear value and allowance S for subsequent working of internal gear profile 4. Blank 2 is heated up to plastic deformation temperature and it is secured to mandrel that is mounted without possibility of rotation. Then blank 2 is deformed by axial effort P equal to $$$, where n - number of intertooth recesses; R - radius of shaped roller 8, mm; R<Mv>1<D> - radius of tooth extensions, mm; $$$- metal yield strength, MPa; $$$- allowance for rolling, mm. Internal toothed surface 4 of blank 2 is deformed lengthwise by means of rotating shaped rollers 9 set in double-section holder 16 and radially arranged on beam lines connecting rotation center 7 of knurled blank 2 with symmetry axis of intertooth recesses. Simultaneously outer cylindrical surface 1 of said blank is step by step knurled crosswise by means of stepped double-row roller unit 11. Deformation is over at temperature of crystallization start. Such method may be used at restoring by hot knurling internal toothed profile of splined sleeve of Cardan joint transmission of motor vehicle GAS-53 and other tubular articles with complex profile. EFFECT: enhanced efficiency. 5 dwg