Jul
18
2007
Melting methods and materials
Development and use of a new optical sensor system for induction furnace crucible monitoring
Wilfried Schmitz *, Frank Donsbach * and Henrik Hoff **.
* Otto Junker GmbH, Simmerath, GERMANY, ** Lios Technology GmbH, GERMANY.
67th World Foundry Congress
Dependable protection of the induction coil against overheating and, the
more so, against contact with molten metal is of vital importance for
ensuring safe and reliable operation of an induction furnace.
Addressing this requirement, various technical solutions for monitoring the
refractory crucible condition were proposed and implemented in the past
but an optimum solution has not been found as yet.
The present paper describes the devel...
Jul
18
2007
Mould and coremaking
A technological advantage for the environmental age
L.R. Horvath
Ashland Casting Solutions, Columbus, Ohio, USA.
67th World Foundry Congress
In today’s world of the environmentally conscious foundryman,
technological progress is required to reduce waste, energy use and scrap
rates. As foundries are forced to turn away from solvent-based products
due to volatile organic compounds (VOC) and exposure limits, waterbased
products continue to grow as the consumables of choice.
Significant progress has recently been made to address the current and
future needs of foundries s...
Jul
18
2007
Mould and coremaking
The significance of total carbon in greensand systems
Alexander Brown
James Durrans and Sons Limited, UK
67th World Foundry Congress
The need for control of raw materials is critical to the success of iron
casting production from greensand systems. The base silica sand is often
overlooked with the main focus on bentonite additions. Carbonaceous
additives can be considered a “necessary evil” to ensure a good surface
finish and reduction in sand related surface defects. Other additives are
used when systems get out of balance and these in turn add further...
Jul
18
2007
Cast iron
Near net-shaping aerospace alloys by thixoforming
P. Kapranos & M. Farnsworth
The University of Sheffield, Advanced Manufacturing Research Centre, (AMRC/Boeing), UK
67th World Foundry Congress
Thixoforming, is the method of shaping metal components in a semi-solid
state, utilizing non-dendritic alloy feedstock heated to a semi solid state,
before being injected into a tooling cavity. The major advantages of this
process are the lower energy costs due to lower temperatures involved,
the removal of molten metal handling, reduced shrinkage porosity and gas
inclusions, fine grain structure and improved mechanical properties, and
t...
Jul
18
2007
Light alloys
A study on the hot tearing in Al-1% Sn cast alloys
G.L. Datta and D. Benny Karunakar
Mechanical Engg. Dept., IIT, Kharagpur, India
67th World Foundry Congress
Hot tearing in certain cast metals continues to bother metal casters. A
number of casting parameters affect the susceptibility to hot tearing.
Experiments were conducted on Al-1%Sn alloys. Al-1%Sn is a high
freezing range alloy known to be extremely prone to hot tear cracking.
Effects of grain refinement and presence of iron and nickel have been
investigated by making use of a ring type casting with a steel core. Al-5Ti-
1B was used as t...
