A New or Improved Method of Drying Moulds and Composition for Use with same.
Year: 1896

page_text: A New or Improved Method of Drying Moulds and Composition for
Use with same.
I, JOSEPH ROWLEY Barn Meadow Iron Works Dukinfield near Manchester,
Engineer do hereby declare the nature of this invention to be as follows :-
This invention consists in a new or improved method of drying moulds and also in
the composition for use with same, the objects being to dry the mould without
burning same and also to render the sand used in moulding sufficiently porous so as
to allow of the free escape of steam or gases through same during the process of
casting. When forming the mould I cause a required number of holes or cavities
to be formed in same at those parts which require drying and I then before casting
fill these holes or cavities with molten metal which dries the mould round about
the holes or cavities the required amount.
In order to render the sand or substance sufficiently porous I mix with same what
is know as short cut straws, chaff or the like material in suitable proportions
for the casting to be made thus dispensing with what is known as sprigging or
venting.
Dated this 5th don
1000
A New or Improved Method of Drying Moulds and Composition for
Use with same.
I JOSEPH ROWLEY, of Barn Meadow Iron Works, Dukinfield near Manchester, in
the County of Lancaster, 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 consists in a new or improved method of drying moulds for casting,
and also an improved composition to be used with the same, the objects of the
invention being to dry the surface of certain parts of the mould without burning the
same, and also to render the sand used in moulding sufficiently porous to allow
of the free escape of steam or gases through the same during the process of
casting.
The nature of my invention and the manner in which the same is to be performed
or carried into practical effect will be readily understood on reference to the sheet of
diagrams hereunto annexed and the following explanation thereof.
Supposing for example that I wish to mould a casting of the form shewn at
diagram No. 1 (say a hammer block), it will be evident to any person acquainted

page_text: with moulding that the principal part of the mould which requires to be dried before
pouring in the molten metal will be the surface of the sides and bottom, and for this
purpose when forming the mould I cause a required number of holes or cavities c to
be formed round the central cavity b (as seen also in plan view at diagram No. 2)
the holes c being preferably parallel or nearly so with the surface or surfaces of the
cavity b which requires drying, and I then (before casting) fill these holes c with
molten metal which dries the inner surface of the mould round the cavity b to the
required amount, and in some cases I prefer also to fill all the holes c partially and
complete the filling thereof at one or more subsequent operations.
Different forms of casting will of course require some variation in the treatment,
but any practical moulder will know what parts of each mould will require drying
previous to casting and will make the holes c for receiving the molten metal for
drying, in the required position and direction.
When the mould is broken up after casting, the metal plugs from the holes c may
be recovered and re-melted.
In order to render the sand or substance used for forming the body of the mould
sufficiently porous to allow of the escape of the steam or gases through the same I
mix therewith what is known as "short cut straws," chaff, or the like material in
suitable proportions for making the mould, the surface being of course "faced up"
with fine sand as usual, and by thus inaking the body of the mould porous I dispense
with the operation known as "sprigging" or "venting."
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I
claim is :-
First. The improved method of drying moulds consisting in forming holes or
cavities at or around the parts requiring to be dried and running molten metal
therein; and
Secondly. Making the body of the moulds porous by the use of a composition
formed of a mixture of sand or the like with short cut straws, chaff, or the like,
substantially as hereinbefore described.
Dated this 2nd day of July 1897.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.