Method of Manufacturing Metallic Pipes without Welding Joint.
Year: 1892

page_text: PROVISIONAL SPECIFICATION.
Method of Manufacturing Metallic Pipes without Welding Joint.
1, CARL GUSTAF PATRIK DE LAVAL, Dr. Phil., of No. 16ª Handtverkaregatan
Stockholm, Sweden, do hereby declare the nature of this invention to be as
follows:-
:-
According to the present invention pipes or pipe blanks of iron, brass, copper or
other metals are manufactured without welding joint by casting and at the same
time pressing molten metal near the point of solidification round a triblet or core-
bar of the shape wanted to be imparted to the pipe. The process is substantially
as follows. By means of two rollers, which are provided either respectively with
a flange or one of them with two flanges, between which the other roller is running,
is formed a receptacle, into which the molten metal is cast at either side of a core-
bar or triblet placed in the receptacle thus formed, and being of the shape to be
imparted to the interior of the pipe, so that the metal is flowing all around the
core-bar and filling, the receptacle. By suitable refrigeration either from without
or from within of the revolving rollers as well as of the triblet, the metal at and
nearest to the contact surfaces of the rollers and the core-bar is caused to coagulate
while the metal between the said surfaces remains in fusion. By rotating the
rollers, the metal, which owing to the refrigeration is adhering like a tough skin
to the contact surfaces, is drawn in between the rollers and the triblet or core-
bar and is pressed or welded together so as to form a pipe or pipe blank of the
shape, determined by the flanges of the rollers and the triblet whereby the metal
still in fusion between these parts is pressed off upwards. By continually pouring
in molten metal lengths of pipe blanks may be manufactured, which then, if desired
or required, may be transformed by compression or drawing to any desired form.
In order to be able to produce a pipe with approximately uniform thickness and
to obtain nevertheless a necessary strength of the rollers, the core-bar is not round,
as in this case the side surfaces of the rollers would form an acute angle to the end
surfaces, whereby the rollers might easily be burnt or broken at this place. The
triblet or core-bar is thus at the point, where the pipe is formed, made to represent
in section a figure with either two opposite or two adjacent corners rectangular or
nearly rectangular.
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COMPLETE SPECIFICATION.
Method of Manufacturing Metallic Pipes without Welding Joint.
I, CARL GUSTAF PATRIK DE LAVAL, Dr. Phil, of No.16 Handtverkaregatan,
Stockholm, Sweden 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:-
.i.
to
According to the present invention pipes or pipe blanks of iron, brass 'copper or
other metals are manufactured without welding joints by casting and at the same
time pressing molten metal near the point of solidification round a mandrel of the
shape to be imparted to the pipe. This pipe may afterwards be transformed to
any other desired form by pressing or rolling. The process is substantially as
follows. By means of two rotating rollers which are provided either respectively
with a flange of one of them with two flanges between, which the other roller runs,
ja receptacle is formed into which molten metal is cast at each side of a mandrel
placed in the receptacle thus formed, and being of the shape to be imparted to the
interior of the pipe so that the metal flows all around the mandrel and fills the
receptacle. By suitable refrigeration either from within or from without of
the revolving rollers as well as of the mandrel the metal at and nearest to the
contact surfaces of the rollers and the mandrel is caused to coagulate while the
metal between the said surfaces remains in fusion.
By rotating the rollers
the metal which owing to the refrigeration adheres like a tough skin to the said
ontact surfaces is drawn, in between the rollers and the mandrel and is transformed
to the shape determined by the flanges and the mandrel. By continually pouring
in molten metal lengths of pipe blanks may be manufactured which then if desired
or required may be transformed by compression or drawing to any desired form.
In order to be able to produce a pipe with approximately uniform thickness and
to obtain nevertheless a necessary strength of the rollers the mandrel. is not round,
as in this case the side surfaces of the rollers would form an acute angle to the end
surfaces whereby the rollers might be burnt or broken at this place. The side,
surface of the rollers must therefore form a right or nearly right angle to the
end surface without flange in order to obtain the necessary firmness, and the
mandrel receives in consequence a particular, corresponding form, namely in section
at the point where the pipe is formed representing a figure with either two opposite
or two adjacent corners rectangular or nearly rectangular.
14 1
In the accompanying drawings
Figs. 1 and 2 shew in vertical section and in plan an apparatus applicable for
carrying out the above described method.
a a are two revolving rollers which are each provided at one side with a flange b.
The rollers are placed abreast and somewhat sideways of each other; having their
flanges directed from each other, so as to form with the flanges a receptacle into
which is introduced a mandrel'c of the section shown in Fig. 2. The mandrel. in
this case in section forms an oval with two opposite rectangular corners cc'whereby
'the rollers'a a at the part. resting against the flanges will obtain sufficient
strength and the produced pipe receive all over nearly the same thickness of the
walls. In the space between the mandrel and the rollers molten metal near the
point of solidification, is poured in from two sides and this forced to flow exactly
round the mandrel so that the pipe when pressed between the rollers obtains the
desired shape. The revolving rollers a a obtain the requisite refrigeration from
within or from without. The mandrel c is hollow and in its lower end a piece c
provided with holes is screwed in. By conducting or pressing a suitable refrigerating
liquid through the mandrel this obtains the requisite refrigeration. Owing to this
refrigeration of the rollers and the mandrel the metal at and nearest to these parts
is caused to set or solidify and adheres like a tough skin c³ to said surfaces. The
skins thus produced are then during the revolution of the rollers drawn in between
i

page_text: the same and welded together so as to form a pipe. The refrigerating liquid
escaping through the holes in the pipe plug refrigerates the pipe immediately
after its formation.
Figs. 3 and 4 show an apparatus somewhat modified. a' a' are the two revolving
rollers. One of them is provided at each side with a flange between which
flauges the other roller a enters so as to form a receptacle between the first
mentioned roller with its two flanges and the last mentioned roller. Into this
receptacle the mandrele is placed. For the above purpose viz. necessary strength
of the corner between the lateral surfaces of the roller without flanges and its end
surface this can here be in question only at this roller, this surface makes a right
angle with the end surface whereby the mandrel obtains the section shown in Fig. 4,
that is, with two adjacent corners rectangular. The shape of the mandrel may
however be varied at will.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed i declare that what I
claim is:
1. The method of manufacturing metallic pipes without welding joints consisting
in casting molten metal near the point of solidification from two or more sides
around a core bar or mandrel placed between two rollers into the space or receptacle
formed by the mandrel, the rollers and the projecting flanges of the rollers, the
pipe being produced by welding of the metal refrigerated to a tough skin at its
contacts with these parts substantially as set forth.
2. In an apparatus for carrying out the method indicated in Claim 1 the
application of a core bar or mandrel which at the place where the pipe blank is
formed is provided with two rectangular or nearly rectangular corners in order to
obtain a satisfactory strength of the forming parts of the rollers in manufacturing
a pipe blank with nearly uniform thickness of the walls substantially as set forth.
Dated this 2nd day of June 1893.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.