Method of joining cylinder bore liners to an engine block

Details Method of joining cylinder bore liners to an engine block Method of joining cylinder bore liners to an engine block

B - Operations, Transporting

21

D

26/106, 26/151

B21D 39/06 (2006.01) F02F 1/10 (2006.01)

Patent

CA 2028084

-11- ABSTRACT OF THE DISCLOSURE Method of bonding cylinder liners to cylinder bore walls, comprising: (a) inserting a cylindrical work hardenable liner into a complementary sized cylindrical bore wall of the block, with a uniform annular radial spacing therebetween of about 0.005 inch; and (b) forcing a nondeformable mandrel throughout the interior length of the cylindrical liner to uniformly circumferentially expand the radially outer surface of the liner into full annular surface-to-surface heat exchange relationship with the interior surface of the bore wall, the mandrel having a cross-sectional radius greater than the interior radius of the liner by a dimension which is at least .001 inch in excess of such radial spacing. Preferably, the cylindrical liner is comprised of steel having a ductility of at least 30%, a hardness of at least 35 HRB, and a wall thickness in the range of 0.050-0.250. The mandrel is preferably formed as a spherical element by a process of pressing and sintering followed by precise grinding to shape, and has a hardness greater than either the liner or bore wall. 4577L

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