Patent ID: 6748655
Filing Date: 2004-06-15
Classification: B21J,F02F,Y10T

Abstract:
A method for producing, by forming techniques, an undercut profile in an outer circumferential face of a cylinder liner to be cast in place in a crankcase, the method comprising the steps of:introducing a bracing inner core into a cavity of the cylinder liner; introducing the cylinder liner equipped with bracing inner core into a first forming die, which is equipped on its working faces with a serrated profile and which comprises a plurality of jaws, which are closed radially relative to a common axis, the jaws being provided with a profile in the form of axially oriented ribs; pressing the first forming die with its serrated profile against the outer circumferential face of the cylinder liner, thus producing a complementary profile in the outer circumferential face of the cylinder liner; introducing the cylinder liner equipped with bracing inner core and provided with the complementary profile into a second forming die, which is equipped on its working faces with a smooth surface and which comprises a plurality of jaws, which are closed radially relative to a common axis; and pressing the second forming die against the outer circumferential face of the cylinder liner equipped with the complementary profile, thus squashing the complementary profile of the cylinder liner and converting it to an undercut profile.