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Патент USA US3037899

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June 5, 1962
c. M. NYSTROM
3,037,339
METHOD AND APPARATUS FOR ANNEALING cons OF STRIP METAL
Filed Dec. 4, 195a
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Inventor I
Carl M Nys/rom
Attorney
United States Patent 0 "ice
3,037,889
Patented June 5, 1962
2
1
3,037,889
NLETHOD AND APPARATUS FGR ANNEALING
COILS ()F STRlP METAL
Carl M. Nystrom, McKeesport, Pa., assignor to United
States Steel Corporation, a corporation of New Jersey
Filed Dec. 4, 1958, Ser. No. 778,139
3 Claims. (Cl. 148—13.1)
This invention relates to an improved method and
atmosphere entrained in the coil convolutions at the start
of annealing to be displaced by the controlled atmos
phere circulated by the fan 10 through duct 8 and hole
16.
Use of the pad of this invention has obviated the neces
sity of edge trimming of coils of strip metal because of
deformation or sticking during annealing. In the case
of electrical or other steels coated with a separating
medium the same has been preserved intact so that it
apparatus for annealing coils of strip metal particularly 10 remains as an even coating over the annealed strip.
for high temperature annealing silicon thereof for long
While I have shown and described one speci?c em
periods of time.
bodiment of my invention, it will be understood that this
embodiment is merely for the purpose of illustration and
In annealing ferrous strip material, such as silicon elec
description and that various other forms may be devised
trical steels, the coils are supported on their lower edges
for long periods of time at temperatures exceeding 2000° 15 within the scope of my invention, as de?ned in the ap
F. The total annealing cycle may involve periods up
pended claims.
to 7 days. At such temperatures, the strip metal be
I claim:
comes softened and the weight of the coil as well as
1. Apparatus for annealing coiled strip metal including
relative movement between the coil and the supporting
a supporting base member, a porous resilient pad of
base tends to deform the edge portion. Moreover, such 20 high temperature resistant aluminum-silicate ?ber dis
posed on said supporting member adapted to resiliently
relative movement exerts considered pressure between
support all of the convolutions of a coil disposed thereon
wraps or convolutions of the coils which in some instances
causes localized welding or sticking despite the presence
and means for circulating a controlled atmosphere through
of a separating material such as magnesia. Since such
a coil of strip metal disposed on said pad.
deformation and sticking may require removal of as much 25
2. A method of annealing a coil of coiled strip metal
comprising supporting said coil on a base member hav
as 11/2 of the strip which may amount to 6% of the
ing a different coe?icient of expansion than said coil,
total strip area, it is evident that such loss adds con
siderably to the annealing costs.
disposing a porous pad of resilient ceramic ?ber between
It is accordingly an object of the present invention to
all of the convolutions of said coil and said base and
provide a method and apparatus for preventing edge de 30 in direct contact with all of said convolutions, heating
formation of coiled strip metal during annealing thereof.
said coil and said base, said pad absorbing the di?erence
The foregoing and further objects will become apparent
in expansion therebetween during said heating and cir
from the following speci?cation when read in conjunction
culating a controlled atmosphere through said porous pad
with the attached drawing, wherein:
and vertically between all of the convolutions of said coil
The single ?gure is a vertical sectional view of an 35 during said heating.
nealing apparatus embodying the teachings of my inven
3. A method of annealing a coil of coiled strip metal
comprising supporting said coil on a base member hav
tion.
Referring more particularly to the drawing, the numeral
ing a different coei?cient of expansion than said coil,
2 indicates a base member adapted to support a coil of
disposing a porous pad of resilient aluminum silicate
strip metal 4 disposed on its edge during annealing there 40 ?ber between all of the convolutions of said coil and said
of. The base may have a refractory upper surface 6
base and in direct contact with all of said convolutions,
supported by ba?ie plates 7 arranged around the fan 10.
heating said coil and said base, said pad absorbing the
During most annealing operations, an atmosphere of the
difference in expansion therebetween during said heating
desired composition is circulated around the coil and
and circulating a controlled atmosphere through said
this may be done by introducing the gas through a duct 45 porous pad and vertically between all of the convolutions
8 circulated by means of a fan It}.
If desired the coil
of said coil during said heating.
can be covered during annealing operations by an inner
cover 12.
In accordance with the teachings of my invention, a
pad or cushion 20 is interposed between the base 2 or 50
refractory top 6 and the coil 4. This pad 20' is com
posed of ceramic ?ber which is su?iciently porous to
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,427,319
Peacock _____________ __ Aug. 29, 1922
1,691,369‘
Baker _______________ __ Nov. 13, 1928
1,893,847
1,895,269‘
1,915,747
1,952,402
Simpson ______________ _._ Jan. 10,
Simpson _____________ __ Jan. 24,
‘Moore ______________ __ June 27,
Wilson _____________ __ Mar. 27,
2,137,869‘
2,557,834
Woodson ____________ _._ Nov. 22, 1938
McMullen ___________ __ June 19, 1951
2,603,577
2,769,630
Eckel _______________ _._ July 1'15, 1952
Keller ________________ __ Nov. 6', 1956
be interposed between wraps or convolutions of the coil
819,001
France ______________ _._. Mar. 10, 1937
thereof. Additionally the pad being porous permits the
515,331
Great Britain ________ __' June 18, 1938
permit the passage of gas therethrough and is sufficiently
heat resistant to retain its resiliency at temperatures of
the order of 2000° F. The ?ber of the pad may con 55
veniently be formed of a ceramic material such as alumi
num silicate.
During annealing the pad resiliently supports the coil
permitting relative movement of the coil and the base
and thereby acts as a lubricant so the lower edges of the 60
coil are not deformed by such movement. This also
1933
1933
1933
1934
FOREIGN PATENTS
prevents dislodging any separating medium which may
UNITED STATES PATENT OFFICE
CERTIFICATE OF CORRECTION
Patent No.’ 3,037,889
'
June 5,
1962
Carl M. Nystrom
It is hereby certified that error appears in the above numlieiiigéii pat
ent requiring correction and that the said Letters Patent should read as
corrected below.
Column 1, line 11, for "thereof" read —— electrical steel
--; llne 21, for "considered" read —— considerable —-; line 26,
‘
after
"1%"
insert
—- inches
—-.
Signed and sealed this 9th day of 0ctoberl962.
a
(SEAL)
Attest:
ERNEST W. SWIDER
Attesting Officer
DAVID L. LADD
Commissioner of Patents
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