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The illustrated bearing
cage was manufactured as a sand casting requiring extensive
secondary machining to provide the tolerances needed for proper
functioning. In addition, problems were encountered when crimping
the ears to hold the balls in place. The inconsistency in the
sand-cast alloy caused breakage.
PIAD's objective was to eliminate
all machining and provide a material with sufficient ductility to
prevent breakage when crimping.
In consultation with S.K.F. design
engineers, tolerances on the pockets as well as for the pitch
diameter were established which allowed proper functioning and were
achievable by PIAD in the as cast condition. The total as cast
tolerance on the ball pocket radius is being held at
± .0035" and the pockets are co-plane within .010".
The as cast surface finish in the ball pockets does not exceed 63
R.M.S.
The material chosen by PIAD is a
lead free yellow brass (PIAD alloy
M010) with a minimum elongation of 40%.
All machining operations as well as
breakage of the ears when crimping have been eliminated.
The stated objectives were
accomplished.
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Solutions |
Bearing
Cage
