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Патент USA US2106614

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` Janffzs, 193s.
Filed Jan. so, 193s
Il ~
2 sheets-sheetgl'
Patented Jan. 25, >1938 _
f ’ 2,106,614'
'_ > 2,106,314
Meur. Mom
Karl A. Lindner, Baltimore,_Md.,
American Smelting and lte?'nin
New York, N. Y., .a corporation of New Jersey
_Application _January so, _1936, semi __No. 61,449
5' claims. (ci. cle-_139)
'This invention relates to metal molds for cast
ing metals and particularly concerns certain im
Like reference characters .denote like parts in
theseveral figures of the drawings.
provements in the construction of such molds ' . Referring more particularly to the drawings, I0
for inhibiting or preventing deformation 'thereof' designates generally a relatively thick-walled _
in use.
copper mold comprising two corresponding pieces _5
In the production of vertical cast copper' cakes, 1 or
halves I2 and Il defining a vertical mold cavity -
i for example, it is lcustomary to pour the molten
copper into a copper mold provided with a vertl
cally disposed cavity and having relatively thick
l0_ walls which are cooled by circulating a stream
of water through conduits disposed therein.
However, notwithstanding the presence ofv the
it which is closed at the bottom' by a removable.
~gate I8. Passageways~~ 20 communicating with
inlets 22 and outlets 2_4 are provided in the mold `
walls for the circulation of the cooling fluid. In 10
the two-piece mold shown, the two halves, after
accurate and true machining'of the abutting sur- _
cooling water. the high temperature of _the molten faces, are held in assembled position by bolts 28
copper introduced into the mold causes strains fitted through holes 28: Recesses 30 are provided ‘ '
15 and stresses to be set up in th'e mold _walls which, for securing the assembled mold in the usual 15
in the case of the ordinary copper mold, exceeds
the elastic' limits"of the mold to such an extent. ' During the casting’operation, the' molten metal
Athat the mold ultimately becomes so warped or induces expansion of the` mold walls which is
deformed that imperfect cakes result.
followed by contraction as the cakes cool and as a
20 »"In accordance with‘thepresent invention, it result
of- these-repeated' strains and stress the 20
has been found that the warping or deformation ordinary mold soon becomes deformed and pro
of the mold is minimized by providing open spaces duces irregularities and imperfections in the cakes.
or areasin the mold walls which allow free ex
In casting substantially parallel-sided cakes par- _ pansion thereof _thus providing relief from _the __ticular1y,`_the warping of the mold may become
25 _distortional forces accompanying the casting op
so pronounced as `to cause the cakesto become 25
eration. These open-areas also facilitate cooling lodged
in the mold from which ¿they are removed
of the >mold and tend to maintain same at lower lonly with dimculty.
operating temperatures by reason of the increased
' surface arca of the mold which they provide.
_Various other featuresof the invention, which
The present' invention overcomes these disad
vantages by insuring freedom of expansion which.
it has been found, may be readily provided by- 30
embrace new and original features of construe-_ »open spaces in the mold wall. These open spaces
» tion. arrangements ofelements and combinations or areas are shown as vertical slots or grooves 32 -
of parts, _will be apparent from the f_ollowingpar-~ -in Figs. 1, land 3, ashorizontal slots or grooves
ticular description and from an inspection of~ the vIl
in Fig. 4; and as both horizontal and vertical
“5 - accompanying drawings.A
4slots in F18. 5.
Although the novel features which are believed
_ The number and spacing of the slots or grooves
to becharacterlstic of this invention will belier-_' will vto a large extent depend upon the size of
ticlllsrly Pointed out in the claims` appended here- - the mold. In 'general the slots may extend to a
40 to, the invention itself, as to its objects and 'ad-l _ 4depth of approximately one half theA thickness
vantages, and >the manner in Vwhich itmay be of the mold wall although a _greater or lesser
a carried out, may be better understood by re-_ ' depth maybe provided as desired. _
» __ „ferring to the following description taken in. con
- nection with the
drawings forming
`- apart thereof, in which -
In the moldshown in Figs. 1-3 two slots in
either half Foi? the mold body are shown and in a -
mold for casting a 800 lb. copper cake with a cav
-1"ig. lis a sectional plan' view of one'form of _ vity measuring v12"' x 4%"`x 35" the slots may be 4»
mold embodying the .present
'alongthe line I-I ofFlg. 2;
.4%" deep and V4" wide.
In Fig. v4 _the mold is shown provided with three
Fig.' 2 is a side elevation of the mold: . _
horizontal slots extending completely around the
__ Fig. 3 is an ‘end elevation thereof with portions _ mold body, the slots being/ approximately 6%"
broken away:
. Fig. 4 is a perspective view of a somewhat modl
.ñed form of mold; and
Fig. 5 is a perspective view of another modified
forìn of mold.
deep in the ends, and-8'.'-- deepin the sides. leav- .
_ ing a metal 'thicknessof about 3" between the
bottoms‘of the slots and the mold cavity. A _
mold of this type with‘the 'slots spaced ,at 4".
intervals has given excellentfresults in casting u
800 lb. copper cake ina mold with a cavity of
strains produced in the metal incident to cast
29" x 4” x 22B/2".
ing operations.
In the modified mold shown in Fig. 5, the slots ~
are both vertical and horizontal, three of the
former and four of the latter -being provided in
the particular mold shown in which the depth
of the vertical slots is 4%" and that of the hori
zontal slots 6" on the sides and 61/2" on the ends
of the mold.
'I'he specii‘lc constructions above described are,
2. A copper mold comprising a body defining a
mold cavity therein having uninterrupted walls,
said body being provided with expansion slots or
grooves extending from the outside of the mold
into the body to a depth of more than half of
the thickness of the body and of suiiicient width
to allow for free expansion of the body> for theV
relief of distortional strains produced in the metal
of course, to be regarded only as illustrative as
incident to casting operations.
the invention is capable of embodiment in va
rious other forms and modifications.
From the foregoing description it will be ap
tically cast copper cakes, the said body being
p 3. A copper mold comprising a body defining
a vertical mold cavity therein for producing ver
provided on its outside only with vertically ex
tending slots .or grooves of substantial depth
improved thin-walled mold in that a substan
tial reduction in thickness of the mold wa'llis ef . and of suflicient width to allow for free expan
fected at intervals while between the intervals sion ,of the body for the relief of distortional
strains produced in the metal incident to casting
of reduction in thickness the requisite reinforce
_ .
20 ment to prevent deformation of the mold under
the weight of the metal cast is present.
While certain- features and embodiments of a vertical mold cavity therein for producing ver
the invention have been described and referred to tically cast copper cakes, the said body being pro
_vided but only on the outside thereof with hori
r in detail for purposes of explanation and illus
zontally extending slots or grooves of substantial
25 tration, it will be understood vthat it is intended
depth and of -suiiicien't width to allow for free
' to embrace within the scope of the invention such
modifications and changes as may be made by expansion of the body. for the relief of distor
¢ those skilled in >the art to adapt it to varying tional strains produced in the metal incident ’to
15 parent that the invention, in a sense, provides an
conditions and uses'.
What is lclaimed is:
1. A multiple piece copper mold comprising two
side pieces joined together, said side pieces hav
ing recessesymachined therein forming a mold
cavity having uninterrupted walls, and slots in
- the outside surfaces only of the side pieces ex
tending _to a substantial depth therein to form
expansion spaces for the relief of distortional
casting operations.
5. A copper mold comprising a body enclosing 30
a mold cavity having uninterrupted surfaces, and
having intersecting slots o_r grooves on its outer
surfaces and extending to a substantial depth in
the mold body to provide free expansion spaces
for accommodating expansion of the mold and 35
alleviating distortional stresses in the mold
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