Improvements in the Method of Upsetting Boiler and other Tubes or Analogous Articles.
Year: 1898

page_text: Date of Application, 1st July, 1898-Accepted, 27th Aug., 1898
COMPLETE SPECIFICATION.
[Communicated from abroad by JOHN R. BLAKESLEE, of Cleveland, Ohio, U.S.A.,
Mechanical Engineer.]
Improvements in the Method of Upsetting Boiler and other Tubes or
Analogous Articles.
I, FRED EUGENE BRIGHT, Mechanical Engineer, of 145, Cannon Street,
London, E.C., 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: —
Heretofore in upsetting boiler tubes and analogous articles in dies, two diffi-
culties have presented themselves; First, the male die becomes so tightly
wedged in the article to be upset as to withdraw the article with the male die
as the latter is withdrawn. Second, it has been found almost impossible to avoid
crimping, wrinkling or corrugating the upset portion of the tube. My invention
obviates both these difficulties.
The annexed drawings and the following description set forth in detail, certain
mechanism embodying the invention; such disclosed means constituting but one
of various mechanical forms in which the principle of the invention may be used.
In said annexed drawings:-
Figure I represents a side elevation of one die section showing two half dies
and their accompanying tools, the tube being shown in section; and Figure II
is a plan view of one half of the two-part die in which the tubes are upset.
The die A, is made in two half sections, each section being formed with two
half dies respectively a, and a', in which the two operations of upsetting the tube
is performed. The half sections of the dies are attached to suitable gripping
mechanism adapted to cause said die sections to grip and firmly hold the end of
the tube B, and die a, is formed at its upper portion with an enlargement b, having
a contour conforming approximately with the ultimate conformation of the end
of the tube to be upset. Die a', is formed with a similar enlargement a³, having
a contour of the exact conformation or dimension of the article to be upset. The
male die D, for the first operation is formed with a working surface d, of gradually
decreasing periphery from the top downward. The second male die E, is of
similar conformation but somewhat longer in length. Male die D, is provided
with an upset-forming shoulder d¹, and a male die E, is provided with an upset-
forming shoulder e¹. The enlarged upset-forming portion b, of the die a, is of
increasing diameter from the top downward and the enlarged portion a², of the
die a¹, is also of increasing diameter from the top downward. This is the most
important feature of my invention, it serves two purposes: First, after the metal
is upset into the enlargement a², the increased diameter of said enlargement
at its lower end prevents the upset tube from being withdrawn from the die as
the heading tool D, is withdrawn. Second, it prevents the crimping or corru-
gating of the upset portion of the tube from taking place. This has always been
the greatest difficulty with reference to upsetting boiler tubes and similar articles.

page_text: I find by means of my dies having a larger diameter at the lower portion than
at the upper, all this bending, crimping and corrugating is prevented, and a
smooth finished surface is produced.
As shown in Figure II the die is made in two parts whereby it may be opened
and the upset tube removed therefrom without difficulty.
Other modes of applying the principle of my invention may be employed,
instead of the one explained; change being made as regards the mechanism
herein disclosed, provided the means covered by any one of the following claims
be employed. I, therefore, particularly point out and distinctly claim as my
invention:-
-
1. In dies for upsetting boiler tubes and analogous articles, the combination of
a female die having an upset-forming-portion of increased diameter from the
top downward, with the male die having an upset-forming-portion of decreasing
diameter from the top downward, substantially as set forth.
2. In dies for upsetting boiler tubes and analogous articles, the combination
of a two part die, having an upset-forming opening of greater diameter at its
lower portion than at its upper portion, and a male die of greater diameter at
its upper portion than at its lower portion, substantially as set forth.
3. In dies for upsetting boiler tubes and analogous articles, the combination of
a separable die, having an upset-forming-opening of increasing diameter from
its entrance downward, and a male die provided with an upset-forming shoulder
and of decreasing diameter from said shoulder downward along its upset-forming
portion, substantially as set forth.
1000