Bulletin 2/2010 - Siempelkamp NIS

SIEMPELKAMP | FOUNDRY 18 19
plaints about our parts following their installation have convinced
our customers of our technical competence,” describes Dirk
Howe.
A top raw casting in regard to geometry and material is the
basic prerequisite for a high-quality fi nished product. Prior to the
actual making of each component part, it is simulated on a
computer. When planning the pattern, Siempelkamp is taking
unusual but successful steps in order to increase the effi ciency
during production. We cast the mill heads including the
trunnions, with diameters of approx. 8 m, in one piece. Heads
with a larger diameter are produced in several segments (2 x
180° or 4 x 90° segments) and the trunnion is produced
separately. At fi rst glance, the segments seem simple, however,
due to the unfavorable properties of these castings including a
small wall thickness but a large area, these parts are very tricky to
produce. In order to reduce costs during mechanical machining,
Siempelkamp focuses on fi lling the mold quickly without
turbulences, on avoiding breaking on the sand moulding edges
and on minimal dross. Our successes in the area of manu facturing
accuracy were a shared team effort. Indispensable in this regard
are the workshops that have been developed specifi cally for this
purpose.
Spectacular and stress-free
The Siempelkamp scope of supply does not only include the raw
casting but also the mechanical machining of the casting and its
Mold fi lling and solidifi cation simulation for mill head production
Removal of the trunnion from the mold
Pattern of a trunnion during molding