Improved Method of Producing Grinding Wheels and the like and Grinding Bodies thus Produced.
Year: 1898

page_text: Date of Application, 10th June, 1898
Complete Specification Left, 7th Mar., 1899-Accepted, 22nd Apr., 1899
PROVISIONAL SPECIFICATION.
Improved Method of Producing Grinding Wheels and the like and
Grinding Bodies thus Produced.
We, KNUT ELOF LJUNGMAN, of Odengatan 8, Stockholm, Sweden, Mechanical
Engineer, and OTTO UNDEN, of Gossater, Sweden, Mechanical Engineer, do hereby
declare the nature of this invention to be as follows.-
The object is to produce in a cheap and effective manner such grinding bodies
as grinding wheels, grinding cylinders or parts thereof that will be efficient, strong
and cheap
The invention consists, briefly speaking, in mixing carborundum with clay,
thereupon pressing the same by means of high pressure into the shape of wheels,
cylinders or the like or parts thereof and thereupon heating the bodies so pressed
in a suitable furnace to such a temperature that the clay just commences to fuse.
Finely washed clay 18 diluted with water until a mass is obtained that may
be kneaded Carborundum 18 thereupon added to and thoroughly mixed with the
clay in a suitable quantity for instance 0 to 75 per cent. by weight. The mass
thus obtained is thereupon pressed into moulds of a shape corresponding to the
shape of the grinding parts desired and subjected to a high pressure so that all
the water is forced out and a very compact mass is obtained Said mass 18 there-
upon heated in a suitable furnace to such a temperature that the clay commences
to fuse Upon cooling off the parts are ready to be mounted either upon rotating
axles or in suitable holders, as the case may be
Grinding-wheels and the like made in the aforesaid manner are very strong;
the burned clay forms a cementing mass for the grains of carborundum, that is
strong, cheap and moreover acts itself as a grinding material.
The method may therefore be modified to the extent that the carborundum is
entirely left out Grinding bodies will thus be obtained of clay alone that are
as good as emery wheels but stronger and cheaper
By mixing in with the common clay, emery or corundum, which are modifications
of alumina, the best product will be obtained for apecial purposes By the word
clay is here meant alumina as well as all kinds of silicate of alumina
D
1
100
1
T
1000
WP THOMPSON & Co.,
322, High Holboin, London, W.C, Patent Agents for the Applicant.
Improved Method of Producing Grinding Wheels and the like and
Grinding Bodies thus Produced.
We, KNUT ELOF LJUNGMAN, of Odengatan 8, Stockholm, Sweden, Mechanical
Engineer, and OTTO UNDEN, of Gossater, Sweden, Mechanical Engineer, do hereby
Price 8d l

page_text: declare the nature of this invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement;-
The object is to produce in a cheap and effective manner such grinding bodies
as grinding wheels, grinding cylinders or parts thereof for working stone and
the like material
The invention consists, biefly speaking in mixing carborundum with clay
with or without emery, or corundum or similar modification of clay thereupon
pressing the same by means of high pressure in moulds of suitable form, and
finally heating the bodies so pressed in a suitable furnace to such a temperature
that the clay and emery or corundum just commences to fuse.
Finely washed clay is diluted with water until a mass is obtained, that may
be kneaded, and eventually emely or corundum 19 added. Carborundum 18 there-
upon added to and thoroughly mixed in with the said mass and in a suitable
quantity, for instance 10 to 75 per cent by weight The mass thus obtained 18
thereupon pressed into moulds of a shape corresponding to the shape of the grind-
ing paits desired and subjected to a very high pressure in order to make the mass
firmly embed the particles of carborundum, so that a very compact mass 19
obtained Said mass is thereupon heated in a suitable furnace to such a tempera-
ture that the clay and emery on corundum commences to fuse Upon cooling off,
the parts are ready to be mounted either upon rotating axles or in suitable holders
as the case may be
Grinding-wheels and the like made in the aforesaid manner are very strong;
the buined clay forms a cementing mass for the grains of carborundum, that is
stronger and cheaper than the formerly known cementing matters and, moreover,
aots itself as a grinding material. It is harder but less brittle than the various
kinds of glass used or proposed for this purpose These gunding bodies are, how-
ever, not suitable for working metals, since the metal adheres to the clay and
glazes the surfaces thereof.
The mixing in with the clay of emery or corundum results in a softer but
tougher artificial clay, which is especially suitable as binding mass for the
carborundum when strength rather than extreme hardness is desired. The emery
or colundum 18 consequently not used as cutting material, since in fusing together
with the clay to a new cement, it disappears By the word clay is here meant
alumina as well as all kinds of silicate of alumina.
Having now particularly described and ascertained the nature of this said
invention, and in what manner the same 18 to be performed, we declare that we
claim 18.
1 The method of producing grinding bodies, which consists in mixing clay with
cai borundum with or without emeiv or corundum or similar modifications of
clay, thereupon pressing the same in a mould to the desired shape by means of
very high pressure, and finally heating the bodies so pressed until the clay and
emery, or corundum, commence to fuse, substantially as described
2 Gunding bodies produced in the manner set forth in Claim 1.
✓ of Malch 1899
'W P THOMPSON & Co,
Of London, Liverpool, Manchester and Birmingham