Improvements in or relating to the Coating of Moulds for Casting Metals.
Year: 1898

page_text: Date of Application, 8th Mar., 1898-Accepted, 6th Aug.,
1898
COMPLETE SPECIFICATION.
Improvements in or relating to the Coating of Moulds for Casting
Metals.
A communication from EDWARD A. UEILLING, Metallurgical Chemist and Engineer,
Newark, Essex, New Jersey, United States of America.
I, JAMES WILLIARD MILLER, Manufacturers' Agent, of Queen Anne's Mansions,
County of Middlesex, 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;-
The invention has relation to the means for coating the travelling moulds in
the Uehling casting apparatus with refractory or carbonaceous material for the
purpose of preventing the metal, which is cast therein, from adhering to the
moulds when solidified. It is necessary that the refractory or carbonaceous material
which is introduced in the form of a layer on the inside of the mould shall present
an approximate uniformity in the sense that the whole of the surface of the metal
mould with which the introduced metal is to come in contact, shall have a coating
of refractory or carbonaceous material, and while it is desirable that this coating
shall be of uniform thickness, perfect uniformity of thickness is not essential.
In the operation of the Uehling casting machine the moulds in an endless chain
move forward with the open side up and return with the open side down. It is
found altogether better to introduce the refractory material into the moulds in
the course of their return from the point of discharge to the point of refilling.
The invention set forth in the accompanying drawing is intended to be utilised to
coat the moulds on their return movement.
It has heretofore been found desirable to apply the coating of the refractory
material through the medium of a spray pneumatically operated. The advantage
of this spray has been found in part to be due to the fact that no part of the
coating becomes separated from the mould by reason of the presence between the
coating and the iron surface of a separating or disturbing agent such as water or
steam. The invention hereinafter set forth, though not a pneumatic spray, is
found to operate in a manner similar to a pneumatic spray, in that it projects the
refractory material in divided particles, or when as usual suspended in water,
them in drops, against the surface to be coated in a manner to prevent the presence
between the refractory or carbonaceous material and the metal or any separating
or disturbing element.
The drawing illustrates in vertical longitudinal section the apparatus forming
the subject of these Letters Patent and illustrating the mode of operation thereof.
A represents a portion of the series of inverted moulds passing in the direction
of the arrow back from the point of discharge to the point of refilling. Located
immediately below the line of movement of the moulds A is a tank B having the
A door E is provided for the
upward flaring mouth C and central well D.
admittance to the well of the refractory material as well as for use as a cleaning door.
In the bottom of the well D is located a rotary paddle F, the purpose of which is
thoroughly to stir the mixture of refractory or carbonaceous material in the
well E. The paddle F is usually driven by the same power that operates the mould

page_text: Toward the upper end of the well D) and projecting more or less if desired into
the flaring mouth C is a wheel & having the radial splashing arms or brushes H.
The material of the splashers H is preferably flexible wire, although a more or less
flexible material may be employed, and if desired, the splashers may be inflexible.
The length of the splashers H is subject to variation but it is usually preferred to
have them sufficiently long to enable them to bend or flex slightly, (if flexible)
while sufficiently short to enable them easily to enter below the level of the liquid
in the well D.
The operation will be manifest. The mixture of refractory or carbonaceous
material and water having been placed in the well D and the paddle F started,
then as the moulds A travel along the upper edge of the apparatus, the wheel G
is caused to be rotated at a high speed with the effect that the brushes splash in a
stream more or less divided against the inner surfaces of the moulds the liquid
refractory or carbonaceous material. The result is to give to the interior of the
mould a perfect and sufficiently uniform coating.
Having now particularly described and ascertained the nature of the said inven-
tion as communicated to me by my foreign correspondent, I declare that what I
claim is:-
1. As a means for coating moulds with refractory or carbonaceous material the
apparatus comprising a receptacle for the coating material mixed with the liquid,
and a moveable splasher operating to splash the liquid mixture against the moulds
as they pass along the open side of the apparatus.
2. The apparatus for applying to travelling moulds an internal coating of
refractory or carbonaceous material comprising a tank B containing the liquid
refractory or carbonaceous material & a rotary splasher located in the upper part
of the tank and partly above the level of the liquid therein, whereby the splasher
in its rotation shall direct the refractory or carbonaceous material against the
interior of the moulds, travelling across the open end of the tank.
3. The apparatus for coating the interior of travelling moulds with refractory
or carbonaceous material, comprising the tank, having the well D and the upper
flaring mouth C across which mouth the moulds travel, means for stirring the
refractory or carbonaceous material in the liquid contained in the well, and a
rotary splasher comprising a central body and radial splasher arms, preferably
in the form of a brush and operating substantially as described.
4. The method of coating the interior of travelling moulds with refractory or
carbonaceous material which consists in causing said moulds to travel in an
inverted position at approximately uniform speed and as they pass a given point to
splash against the moulds a mixture of carbonaceous or refractory material and
water.
5. The method of coating the interior of travelling moulds with refractory or
carbonaceous material which consists in placing the liquid refractory or car-
bonaceous material in a suitable receptacle, agitating the mixture to cause the
solid material therein to be thoroughly distributed, causing the moulds to be
coated to pass in an inverted position across the opening in said receptacle and
simultaneously splashing from the surface of the liquid in the receptacle and
against the inner surface of the moulds the mixture contained in said receptacle
substantially as set forth.
Dated thin Qth day of Moab 1900