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Патент USA US2131307

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Sept. 27, 1938.
v
2,131,307
G. BEHRENDT
CHILLYFOR CONTINUOUS STRING CASTING
Filed Nov. V12, 195e
.
.
i
Patented Sept. 2_7, 1938 '
_2,131,307
. UNITED » STATES
PATENT OFFICE)
“allais”
.
cmu. >ron. coN'rlNUoUs arma cAs'rlNG
Ger-ima Behrendt, Denim-mr, Germany
.Appueeaen November 12,1936, s‘erl'n Ne. 110,538
-> .~
In Germany October 25, _1935.
p
«The present invention relates .to >casting molds~ the pressure of the liquid metal. Thus, it has
and more particularly pertains to. the longitu
been noticed, particularly in the case of steel
dinal shape of a chill adapted i'or continuous`> ingots of large diameter, which during the shrink
' stringcasting- of steel._
38e lnove away much farther from the mold
5
It is known to cast metals in acontinuous wall than those ot small diameter, that the dan- 5
string. For carrying out this process it has been >ger of the forming of longitudinal cracks is much
proposed to cast the metal in a hottomless mold. » greater `than in the case of thin ingots." This is
allow it to- congeal therein and continually and primarily due to the reduced withdrawal of heat
uniformly remove it fromthe mold according to set forth' above and the results therefrom.
l0 the progress of the congealing. ' The casting
.` .According to the invention the objections- to l0 _
molds generally employed forshaping the string
casting _molds hitherto used forstring cast- A
have a prismatic -or cylindrical internal shape... ing are 'eliminated or at least considerably re- '
Various suggestions have, however.> been made »_duced by a special shape of the casting chill.
to .give the casting’ mold a shape widening in. The shape of the casting chill accordingto the
1.5 cross-sectional area towards its outlet end. invention is characterized in that the internal l5v
Such molds add to instead of avoiding the chf cross-sectional -area oi the string mold narrows
jections hereinafter set forth, inherent to the along vthe 'portion on which the string contracts
continuous string casting process in that, espe- ' during «the congealing process. so that the for
cially when castingmetals withl a high melting
20 'point such as steel, the diii‘iculty arises that the ' mation vci' an air gap between the wall _of the
chill -and the cast stringis as far- as possible pre- 20
quantity of _heat accumulated in th'e material to
be cast cannot be conducted oi!V suiliciently
vented. and, on the other hand, the extent o!
the narrowing does not exceed that of the shrink
quickly, so that the economy'and practical carry- '
Consequently. the internal cross-sectional
ing cut of the string-casting is ieopardised,
25
area- of-theingot mold decreases eithenalong the
’The llíi‘iid meta'l 'comes' into contact with ‘the y entire. lengthh' or only along a portionthereoi 2_5
*cold mold wall in the string'casting chill. and towards the discharge end.
becomes coated with a thin skin of congealed
The drawing shows a vertical cross-section of.
. As the conducting oi! of'theheat pro
vthe mold.
gressesthisskinincreasesinthickneasincon
'
.wana meld conm-wea in this mannertne `
30 tact with the cold mold,wall until it can wi
vmovingïstring«will always remain as near as l0 _
possibleto the‘cold mold wall. Thus, the cool
‘ing conditions prevailing in the.. charging~ end of'
.the mold do not change -at all or> only slightly, -
wallsothatagapisproduced. .Thewayinwhich so> that-the danger of formation of cracks is
36 the heat’is conducted di'. therefore. varies-in
eliminated.
such a `manner that the leading ci! ci the heat
Furthermore it is more easily pos- $5' v -
`siixole to. cause large quantities of metal to congeai
.in a short time. _'
by
'changes
conduction
into a leading
predominating
oi! chieilyat
cilectcd by ll‘a
diation. During the continuous and also
d0 rupted discharging ot the Matting from
'chill mold inthe string casting chills
.
,
’
'I claim:
>>1.4i :ma emu-"for string wenn: steel, the
cross sectional area of the chill decreasing in'io
-thedirection inwhich the string is adapted tol
employed, an air, gap is -formed which
move therethrough, and the extent oi' the de
- larger towards the delivering side t the string
creasenot exceeding that of the shrinkage ot the
-ltF-"M-
j
'
`
‘2. Achiliasspeciiiedinclaim Linwhichthe ß
o! theheat.
`-
.
l
Thisisincontradictiontotherequiremenhto
withdraw from theingct at leasttheaamequan
titles of heat after as_beiore theshrinkage com
z-menceabecauseitmayotherwisehappenthat
V the core, which is still liquid. reheats'the ingot
skln,sottensitandthmcausesitto~bmst_under.
decrease incroß sectional area extends alongA
the entire length-'of the chill.
f 3. Achillasspecinedinclaimhinwhiehthe
ibcrease incl-oss sectional area only extends
along a portion of the entire length of the-chill. l
GERHARD
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