Improved Method of and Means for Spinning, Welding, and Shaping Metal Tubes.
Year: 1891

page_text: COMPLETE SPECIFICATION.
Improved Method of and Means for Spinning, Welding, and Shaping
Metal Tubes.
1, JULIUS GEORGE BOHL, in the City and County of Peoria, State of Illinois,
United States of America, Secretary and Treasurer of Peoria Metal Spinning Co.,
do hereby declare the nature of my invention for IMPROVEMENTS IN SPINNING
TUBES, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
My invention relates to the formation of tubes and other articles and to pro-
viding means for closing them at the ends or for reducing or increasing their
diameter, or welding or joining the ends of two or more tubes together, as will be
hereinafter described.
My invention consists in employing a hard metal die or former suitably
mounted upon the spindle of a lathe, said die or former provided with a smooth
recessed face or with a smooth longitudinal perforation, or with both, as may be
required. This recessed face or perforation receives the tube or other article to
be formed. When the die is revolved to sufficient velocity, the tube or other
article forced into the die or former becomes intensely heated from frictional contact,
thereby softened and made susceptible of being reduced, closed, or otherwise formed
in any suitable or desired manner. In the process the article to be formed may be
revolved while the die remains at rest, or both revolved in opposite directions, as
convenience may suggest.
Referring to the accompanying drawings, which form a part of this Specifi-
cation,
Figure I represents a side elevation of a lathe for spinning tubes or other articles
according to my method.
Fig. is a similar view with the parts transposed.
Fig. represents a longitudinal section of a die or former used in my process
of reducing a metal tube to one of smaller diameter. It also shows the tube before
being operated upon.
Fig. 11 is an end elevation of the die or former.
Fig. IV shows the tube and die after the tube has been operated upon.
Fig. V is a longitudinal section of a die where it is desired to close the end of
the tube. The tube is also shown.
Fig. VA is a view showing the operation completed.
Fig. VI represents the die used to weld two tubes together for the purpose of
lengthening the same.
Figs. VII, VIII, IX, X, XI, and XII represent some of the different results
accomplished by my process of reducing and increasing the diameter and closing
the ends of metal tubes.
In Fig. I, D represents a hard metal die or former securely held in the hollow
spindle of a lathe, and T a metal tube about to be forced into the hard metal die D
by means of the tail-stock screw or lever. The die D is revolved at a high rate
of speed and receives the tube, which, coming in contact with the die, is softened
by reason of the intense heat generated by frictional contact. The position of these
parts may be reversed, as shown at Fig. 1A, which represents the die inserted in the
tail-stock of the lathe and securely held by same, T representing the tube inserted
in the spindle and revolving rapidly. It receives the die, which is forced into it by
the tail-stock screw or lever.
In Figs. I and III, I show the die in longitudinal section and in front elevation.
This die is for the purpose of forming tubes with small termini, E representing
the large opening or entrance, and e the small opening or exit. At T, I show the
tube about to enter the dic.

page_text: Fig. IV represents the die as having received the tube and reduced and formed
it, as desired, with a small opening at d and a large opening at L.
Fig. V represents the central view of the dic, whereby the ends of a tube are
securely closed and welded by means of the tube striking the wall, which
bends, closes, and securely welds the end of a tube in a smooth manner.
represents the tube about to enter. Fig. VA represents this completed tube
closed at the end.
In Fig. VI, I represent a die in longitudinal section. X represents the opening
of the die to receive two tubes to be welded together.
represents a tube.
represents another tube slightly larger, which first has its end reduced, as at », to
enable it to be inserted into the first tube. The tubes are now forced into the
die D, and the moment the tube comes in contact with the die it becomes
reduced, and by reason of the intense heat generated by the frictional contact of the
rapidly-revolving die is immediately welded to the tube t, and passes out of the
opening o reduced to the same size and thickness as tube t.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, 1 declare that what I
claim is :-
--
1. The method of spinning metal by forcing it into or through a die of harder
metal revolving at a high rate of speed, so that the softer metal is heated by
the friction between the parts, whereby the metal may be more easily spun or
formed.
2. The method of forming tubes and other articles and reducing or increasing
their diameter and welding tubes together by frictional contact by means of a
revolving die or former, as hereinbefore described.
Dated this 20th day of February 1891
F. W. BARKER,
Applicant's Agent.