Grinding
closes the pores of all grades of this porous steel. Milling
will close the pores of 7 micron and reduce the pore size of
the 20-micron material down to about 7 microns (when done
correctly) by partially closing the pore opening at the
surface. Stoning, using a back and forth/side to side method,
will re-establish permeability by removing the metal that is
crushed over the pores. Stoning and polishing, up to about a
number 800 - 1000 stone/paper finish, is possible. During the
stoning and polishing process, it is important to occasionally
flush the pores at the surface to prevent packing the pores
with debris.
Electric
Discharge Machining is the best way to re-establish
permeability. This
method will burn away the metal fragments that are crushed
over the pores by milling and/or grinding.
Note:
When using wire EDM machining methods, Porcerax II is porous
and generates waste particles that can create
"arcing" conditions between the wire and the
work-piece. This arcing can cut the wire. As a countermeasure,
increase wire winding speed.
Note:
When using an electrode for EDM, it is important to program a
peak-to-valley burn rate that exceeds the pore size; i.e. <
7 micron depth for 7 micron pore size is desirable.
The
illustrations above show how particles created by the wire EDM
process carry the electrical current across to the work-piece,
creating the potential for a discharge that can break the
wire. Increasing the wire winding speed not only greatly
reduces the potential for wire breakage but also increases
machining times. <
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All technical and engineering data and suggested procedures,
specifications and applications contained in this publication are for
general information only. Sintokogio, Ltd. International Mold Steel and/or
their distributors disclaim any and all express or implied warranties of
merchantability, suitability for any particular purpose or use, or freedom
from infringement of any patent, trademark or copyright. Porcerax II® is
a registered trademark of International Mold Steel, Inc. and Sintokogio,
Ltd. |
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1-800-625-6653 |
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| International
Mold Steel, Inc. is a licensed distributor of Porcerax II, a
SINTOKOGIO,LTD. product. |
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International
Mold Steel, Inc.
6796 Powerline Drive
Florence, KY 41042 USA
Tel: (859) 342-6000 or 1-800-625-6653
Fax: (859) 342-6006
Literature: info@imsteel.com
Sales
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