COMBINED TOOL FOR SIMULTANEOUS BORING AND EXPANDING OF OPENINGS Russian patent published in 1997 - IPC

FIELD: mechanical engineering. SUBSTANCE: bearing portion 8 of the first row of deforming members 4 of the tool can move from bearing portion 9 of the second row of deforming members 5 by the width of replaceable ring 10 interposed between the bearing portions to arrange the deforming members of the first row over the diameter by 1/3-1/2 of allowance for plastic deformation of a part. Separators 6 and 7 are mounted on the mandrel for permitting combined axial movement. Deforming members 4 of the first row are shifted over periphery by 1/2 of the pitch with respect to deforming members 5 of the second row. EFFECT: improved design. 2 dwg