Bp. Fraticelli et al., SEQUENTIAL TOLERANCE CONTROL IN DISCRETE PARTS MANUFACTURING, International Journal of Production Research, 35(5), 1997, pp. 1305-1319
Citations number
17
Categorie Soggetti
Engineering,"Operatione Research & Management Science
The machining of complex parts typically involves a logical and chrono
logical sequence of n operations on m machine tools. Because manufactu
ring datums cannot always match design datums, some of the design spec
ifications imposed on the part are usually satisfied by distinct subse
ts of the n operations prescribed in the process plan. Conventional to
lerance control specifies a fixed set point for each operation and per
missible variation about this set point to insure compliance with the
specifications. This approach is inadequate for complex, low volume, h
igh-value added parts such as those found in the aircraft, nuclear, or
precision instrument manufacturing industry. This paper introduces th
e concept of Sequential Tolerance Control, an approach that uses real-
time measurement information at the completion of stage j to exploit a
vailable space inside a dynamic feasible zone and reposition the set p
oint for operations j + 1 to n. The procedure is repeated at appropria
te locations along the n operations so as to optimize the production o
f an acceptable part.