MANDRINO CON DISPOSITIVO AUTOMATICO DI SPOSTAMENTO ANGOLARE A PASSO DEL LE GRIFFE COSIDETTO DI INDEXAGGIO

摘要

An automatic indexing mandrel comprises a dividing pivot (20) separately and in succession, operated by a dividing shaft (29) and a locking sleeve (23). The dividing shaft (29) is slideably and sealingly accommodated in the cavity of the locking sleeve (23) which has retention planes (28) for the dividing pivot and is in turn sealingly accommodated in a mandrel body cavity divided into counterposed chambers (24,32) by a separator (31); the dividing shaft (29) and the locking sleeve (23) forming a single circuit fluidodynamic system with counterposed pistons and reversible inlet and outlet, the pistons moving in opposite directions to perform in succession unlocking, rotation and locking of the dividing pivot (20).