IMPROVEMENTS IN CAST-IRON CHILLED ROLLS
Year: 1878

page_text: LETTERS PATENT to John David Grey, of Aberavon, and Isaac Davies, of
Britton Ferry, both in the County of Glamorgan, South Wales, for the Inven-
tion of "IMPROVEMENTS IN CAST-IRON CHILLED ROLLS."
Sealed the 22nd November 1878, and dated the 23rd May 1878.
PROVISIONAL SPECIFICATION left by the said John David Grey and
Isaac Davies at the Office of the Commissioners of Patents on the 23rd May
1878.
JOHN DAVID GREY, of Aberavon, and ISAAC DAVIES, of Britton Ferry, both in
the County of Glamorganshire, South Wales. "IMPROVEMENTS IN CAST-IRON
CHILLED ROLLS."
This Invention relates to improvements in cast-iron chilled rolls, and has refer-
once both to the process of manufacture of the rolls and to the rolls themselves.
Cast-iron chilled rolls as at present used are cast solid, the process of manufac-
ture being to run the molten metal into a mould or chill of the required form and
size. Such rolls in rolling heated metal for the production of plates of metal or for
other such purpose, are found frequently to break owing to the great expansion
and contraction thereof caused by the contact with the heated metal.
According to our Invention we form the roll with a concentric hole throughout
its length of any desired diameter, and through this hole we run water when the
roll is in use, thus maintaining it comparatively cool, and so reducing the expan-
sion and contraction thereof to a minimum. The roll is thus prevented breaking,
and its original and desired dimensions maintained throughout the working.
In casting rolls as above described we place a wrought-iron pipe in the centre of
the mould or chill, which chill is of the ordinary construction and material. We
then run in the metal round said pipe, which, after the casting has cooled down,
remains in the centre of the roll, thus forming a concentric hole throughout its
Prine G21

page_text: length. We prefer to cast the roll on end and to introduce the molten metal at the
bottom of the mould.
To prevent the internal tube collapsing during the above operation we either fill
it hard with sand or clay, or run water through it to keep it cool and strong.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Jolin David Grey and Isaac Davies in the Great Seal Patent Office
on the 23rd November 1878.
JOHN DAVID GREY, of Aberavon, and ISAAC DAVIES, of Britton Ferry, both in
the County of Glamorgan, South Wales. "IMPROVEMENTS IN CAST-IRON CHILLED
ROLIS."
This Invention relates to improvements in cast-iron chilled rolls.
Cast-iron chilled rolls as heretofore used (for rolling iron plates, bars, and such
like purposes) have been cast solid, the process of casting being to run the molten
metal into a mould or chill of the required formn and size. Such rolls while in use
for rolling heated metal for the production of plates or bars of metal, or for other
similar purposes, have been found frequently to break owing to their expansion and
contraction caused by contact with the heated metal operated upon and their cou-
sequent heating and cooling. To prevent such breakage is one of the objects of the
present Invention.
According to our Invention we form the roll with a concentric hole throughout
its cutiro length, the hole throughout its length being uniformly of the same
diameter. Through this hole we run water or force air when the roll is in use, thus
maintaining it comparatively cool, and so reducing the expansion and contraction
to a minimum. With rolls thus constructed and used the liability to break is
removed, the original and desired dimensions of the roll are practically maintained
throughout the working, the roll is rendered much more durable, and a great saving
in the quantity of the lubricant required is effected.
In casting rolls as above described we prefer the following system:-We place a
wrought-iron pipe in the centre of the mould or chill, which is of the ordinary
construction and material. The molten metal is then run in round the said pipe
which after the casting has cooled down is found firmly embedded therein and
remains there as part of the roll, thus forming a concentric hole throughout its
length. We cast the roll on end and introduce the molten metal at the bottom of
the mould.
To prevent the internal or central tube collapsing during the process of casting
we either fill it with sand tightly rammed down, or run cold water through it till
the casting has cooled down to keep the tube cool and strong.
Figure 1 of the accompanying Drawings is a longitudinal central sectional view

page_text: of a roll constructed according to our Invention, and Figure 2 an end view of
same.
A is the roll, and a the central tube as remaining in the casting and constituting
a part of the roll. These views show the proportions of the diameter of the hole in
relation to that of the roll we prefer, though we do not confine ourselves thereto;
neither do we confine ourselves to the particular manufacture described; also, wo
have described the roll as having an internal tube embedded in it and forming part
of the roll. This is preferred by us but is not absolutely essential. The roll may
be cast with the hole as described through it but without the internal tube. Thus
constructed the roll will be found much superior to those heretofore used, but is not
so good as with the interior embedded tube; neither is it absolutely essential that
water or air should be passed through the roll during its use, but nevertheless by
such means the advantage derived from our construction of roll will be materially
increased. Further, we have described the hole through the roll as being of uniform
diameter throughout. This should be practically adhered to, but any slight devia-
tion therefrom would not materially alter the principle of our Invention.
In Figures 3, 4, 5, & 6, of the accompanying Drawings we have shown two
examples of such slight modification.
In Figures 3 & 4. the hole is shown as slightly and gradually increasing in
diameter from one ond to the other.
In Figure 5 & 6 the diameter of the hole is shown slightly enlarged towards the
centre of the roll. We, however, much prefer the hole of uniform diameter through-
out its length.
Having thus particularly described and ascertained the nature of this our
Invention and the manner in which the same is to or may be performed, wo
claim as our Invention to be secured by the herein-before in part recited Letters
Patent,
Firstly. The improvements in chilled rolls, substantially as herein-before set forth
and described, and illustrated in the accompanying Drawings.
Secondly. The employment with such rolls, when in use, of a stream of water or
current of air, substantially as herein-before set forth and described.
In witness whereof, I, the said Isaac Davies, on behalf of myself and the said
John David Grey, have hereunto set my hand and seal, the Twenty-third
day of November, One thousand eight hundred and seventy-eight.
ISAAC DAVIES. (L.S)