Dear Trevor,
We have extensive experience of producing large sand moulds successfully
and accurately with EOSINT S. Our application engineers will contact you
directly to give you some tips. Any other of our customers who have any
questions are of course also invited to contact our application
department directly.
Best Regards,
Mike Shellabear
********************************************
Dr. Michael Shellabear
Assistant to the Management Board
EOS GmbH Electro Optical Systems
Pasinger Strasse 2
D-82152 Planegg/Munich, Germany
Tel.: +49 (0) 89 85685-122
Fax: +49 (0) 89 8598402
Email: shellabear@eos-gmbh.de
********************************************
----------
Von: IAN HALLIDAY[SMTP:ESRMJ@atcmail.wmg.warwick.ac.uk]
Gesendet: Donnerstag, 7. August 1997 18:09
An: rp-ml@bart.lpt.fi
Betreff: DTM Zircon Sand Postcuring
Hello All Sand Users,
We are having some problems with the postcuring of the DTM
Zircon
sand when producing large sand boxes. The two sand boxes are 310
x
280 x 140 mm in size. The built perfectly on our 2500
Sinterstation
but both attempts to postcure them ended in failure. The first
attempt involved ramping up to 200 C in 1 hr and holding at
temp. for
2 hrs. The sand box had warped and cracked under its own weight
and
was a chocolate brown colour. The second attempt involved 1 hr
at 65
C, 1 hr at 110 C and 1 hr at 150 C. The sand was okay upto 110 C
but
after 0.5 hr at 150 C had warped and cracked very badly,
although it
was the required olive green colour.
Has anyone had experience in postcuring zircon sand in large
blocks.
We can do it for small pieces but not large blocks. Do you need
to
support the block in glass beads? Is the any benefit in surface
curing using a flame or hot air gun?
We have also experienced the same problem postcuring the same
sand
moulds produced on our EOSINT S in silica sand!
Hope to hear any of your experiences
Dr Trevor Illston
Rover Group RP&T
University of Warwick
United Kingdom
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Rover RP&T,
3rd Floor ATC,
University of Warwick,
Coventry,
CV4 7AL,
UK
Tel - 0044 1203 524907
Fax - 0044 1203 524878
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This archive was generated by hypermail 2.1.2 : Tue Jun 05 2001 - 22:40:17 EEST