Improved Bottom Plate for Ingot Moulds.
Year: 1892

page_text: Date of Application, 11th Nov., 1892.
Complete Specification Left. 11th Aug., 1893-Accepted. 16th Sept. 1893
PROVISIONAL SPECIFICATION.
Improved Bottom Plate for Ingot Moulds.
CHARLES JOHN BAGLEY General Manager care of Moor Steel and Iron
Co. Ld. Stockton-on-Tees, County of Durham LLEWELYN ROBERTS Steel Works
Manager care of Moor Steel and Iron Co. Ld. Stockton-on-Tees, County of
Durham do hereby declare the nature of this invention to be as follows:-
Our invention consists of an improved bottom plate for ingot moulds to stand on
when casting steel ingots, to prevent excessive waste in crop ends caused by the
whole of the bottom end of ingots being flat, and in the process of rolling into
plates, rails, angles, girders &c. the steel laps over and causes unsound ends.
We
purpose obviating this by having the ingot mould bottom cast bevel the present
casting forming the ingot mould bottom to slope or bevel inwardly for a few inches
towards the centre from the inner edge of the vertical part of the mould at an angle
of about 45° or other suitable angle, but the centre for about one half or a third of
the area to be flat and in this a recess formed to a suitable depth for the reception
of a fire brick or bricks or other refractory substance.
Dated this Tenth day of November 1892
CHARLES JOHN BAGLEY.
LLEWELYN ROBERTS.
COMPLETE SPECIFICATION.
Improved Bottom Plate for Ingot Moulds.
We, CHARLES JOHN BAGLEY, and LLEWELYN ROBERTS, General Manager
and Works Manager respectively, of the Moor Steel and Iron Company, Limited,
Stockton-on-Tees, in the County of Durham, 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 :-
Our invention consists of a specially constructed bottom plate for ingot moulds
to stand in the vertical position in which they receive the charge of molten steel
which forms the ingot. .
Usually such bottom plates have been constructed with a flat and level surface
only, thus imparting to the ingot a flat or approximately flat bottom end, and it is
found in practice that when the ingot is passed through the rolls to reduce it to the
thickness at which it is sheared into slabs for the reheating furnace the bottom end
becomes fish-tailed sometimes to a distance of several inches into the end of the
slab.
As it is essential to the subsequent operation in dealing with these slabs, such as
rolling them into plates, rails, angles or girders, as the case may be, that the ends
of each slab be sound, these fish-tailed ends have to be sheared off the material so
cut to waste amounting to from 2 to 3 cwt. for an ingot of 3 tons when rolled down
from the usual mean thickness of twelve inches in the ingot to a uniform thickness
of 5 inches in the slab.
The object of our invention is to avoid this waste by obtaining sound ends in the
slabs as they leave the rolls, and to this end we use a bottom plate of the special
form hereinafter described and illustrated in the drawings hereto annexed, in
which
Figure 1 is a side elevation partly in section and Figure 2 a corresponding plan
view of our improved bottom plate as constructed for the reception of three ingot
moulds.

page_text: .
Figure 3 is a transverse sectional view taken on line a x of Figure 2 with the
ingot mould shown in position upon the plate for the reception of the molten steel.
Figure 4 is a longitudinal narrow side view of an ingot when cast on the ordinary
flat bottom mould, and
Figure 5 is a corresponding edgewise view intended to illustrate the fish-tailed
end which is formed as the ingot is rolled down to the thickness of a slab.
Figure 6 also represents a longitudinal narrow side view of an ingot when cast
on our improved bottom plate to obtain the form of bottom end which does not
become fish-tailed as the ingot is rolled down.
It will be observed that in place of the flat or level bottom plate hitherto used,
we provide the bottom plate with recesses a, a, a, the special configuration of which
constitutes the essential feature of our invention. The contour of each recess a
corresponds to the internal form of the ingot mould b so that the molten steel
instead of being received on a flat or level surface is received into the recess or
tray a, the sides of which are sloped or bevelled inwardly in the manner shown, that
is to say that the sides at a¹ converge almost in a continuous curve as shown more
particularly in Figure 1; whilst the ends a converge only slightly as shown
more particularly in Figure 3. A relatively small and central area c amounting
to about one-half or one-third of the area of the whole recess is occupied by a
cushion of fire brick or the like refractory material which is readily removable and
therefore easily renewed from time to time as required. The surface of this brick
conforms to the contour of the recess in the manner shown in the figures.
The principle involved in substituting a recess of the special configuration as
herein before described and shown in the accompanying drawings whereby the bottom
end of ingot takes the 'form shown in transverse view in Figure 6 is that this
departure from a flat end serves the purpose of an excresence to the ingot proper
which instead of being drawn into the form of a fish-tail as shown in Figure 5
(which is intended to illustrate the result to be looked for in rolling down the
ordinary flat bottom end ingot as shown in Figure 4) is only drawn into line with
'the rest of the material by the action of the rolls when reducing the ingot to the
thickness of a slab, so that there is no waste end to shear off the slab as has hitherto
been the case.
It is obviously desirable that the mould shall be without difficulty made to
exactly correspond with the recess a and to ensure this result we provide the
tapered guide pieces d cast on the bottom plate in any required position for guiding
the ingot moulds into exact position with their respective recesses in the bottom
plate.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we would observe in
conclusion that we are aware that the method or principle of causing bottom plates
for ingot moulds to be recessed is not new, we therefore make no general claim to
such method or principle, but we declare that what we claim is :-
In bottom plates for ingot moulds the use of a recess for each mould by which
the bottom end of the ingot is caused to take the precise form of a tapered or
converging excresence to be drawn into the bulk of the ingot as the ingot is being
rolled down, substantially as and for the purpose as hereinbefore described with
reference to the accompanying drawings.
Dated this 10th dex of Avec 1902
G. J. CLARKSON,
Chartered Patent Agent,
Stockton-on-Tees, Agent for the Applicants.
G. J. CLARKSON,
Chartered Patent Agent,
Stockton-on-Tees, Agent for the Applicants.