Improvements in Moulding Materials for Use in the Manufacture of Steel Castings and in the Method of Preparing the same."
Year: 1898

page_text: Date of Application, 26th Jan., 1898-Accepted, 12th Mar., 1898
COMI LETE DIECIFICATION (AMENDED.)
66 Improvements in Moulding Materials for Use in the Manufacture of
Steel Castings and in the Method of Preparing the same."
We, ADAM HELMER PEHRSON, of Söderfors Bruk, in the Kingdom of Sweden,
Mining Engineer, and ERLAND VICTOR PEHRSON, of Bofors Bruk, in the Kingdom of
Sweden, Mining Engineer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
This invention relates to a moulding material for the manufacture of steel castings
and to a method of preparing such material.
It is well known that for the moulding and casting of cast iron so-called raw sand
is used, that is to say sand moistened with water. This moulding material cannot,
however, be employed when casting Martin, Bessemer or crucible steel or another
steel having a high melting point, as the high temperature causes the formation of a
great quantity of steam in the mould and consequently blisters in the castings. It
has, therefore, been necessary to cast such steel in dry sand moulds, and for the
preparation of moulding material for dry sand moulds finely ground and highly burnt
refractory clay with an addition of petroleum or another oil has been used. The
employment of this moulding material is, however, expensive and causes waste of
time in consequence of the drying operation to which the moulds must be subjected
before the casting process. A moulding material for steel castings, which material
shall be cheaper and more easy to employ than those hitherto used, has therefore
been wanted for many years.
According to our invention we employ a moulding sand which, instead of being
moistened with water, is moistened with a liquid having a high boiling point,
for instance an-oil-(either vegetable,,-animal---or mineral.) Other suitable
liquids for-the--purpose--are glycerine, syrup, sugar solution or the like. When
employing our moulding material the casting of iron or steel is effected as easily and
completely and in the same manner as when casting iron in raw sand moulds. Drying
the moulds before the casting process is not necessary, and when using the moulds
no gases causing blisters in the castings are generated.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
1. The method of preparing a moulding material adapted for moulds for casting steel
or iron from Martin, Bessemer or crucible steel furnaces, such method consisting in
noistening ordinary moulding sand with a liquid having a high boiling point,
preferably an oil-of vegetable, mineral-or-animal-origin, or glycerine, syrup, or sugar
solution, substantially as herein before described.

page_text: 2. Moulding material adapted to be used for the casting of iron and steel without
being dried, the said material consisting of ordinary moulding sand, moistened with
a liquid of the kind described in the preceding claiming clause.
Dated this 26th day of January 1898.
G. F. REDFERN & Co.
4, South Street, Finsbury, London, Agent for the Applicants.