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Патент USA US2261937

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- Nov. 11, 1941.
J. w. KELSO
2,261,937
MEANS FOR COOLING PIERCING POINTS‘ OF ‘TUBE ROLLING MILLS
Filed July 22, 1939
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Patented Nov. 11, 1941
2,261,937‘ '
UNITED STATESPATENT OFFICE"
>MEANS FOR, COOLING PIERCING POINTS
OF TUBE ROLLING MILLS
John W. Kelso, East McKeesport, Pa., assignor to.
National Tube ‘Company, a corporation of New
Jersey
Application July 22, 1939, Serial No. 286,016
3 Claims. (Cl. 80—13)
This invention relates to tube or pipe rolling
Referring more particularly towthe drawing.
mills and, particularly, to an improved means for
there is shown a pair of driven metal-working
cooling the piercing points thereof.
rolls 2 and guides 3 of the conventional type for
In one method of manufacturing pipes or
tubes, as is well known to those skilled in the art,
it is the practice after ?rst piercing the hot steel
drawing a pierced shell or blank 4 over the pierc
ing point 5 and hollow mandrel bar 6 to expand
and elongate the same, a practice which is well
known to those skilled in the art.
~ billet to expand and shape the resulting shell to
size by providing a mandrel bar having a larger
piercing point on the end thereof and to expand
the shell or cylindrical blank by forcing it over
According to the present invention, there is
disposed in the outer endof the mandrel bar 6
v10 between the end thereof and. the piercing point
a piercing pointand mandrel bar, thereby ex
5, a bar cap member ‘I having a reduced inner
panding the shell which, of course, results in the
threaded end portion 8 which is screwed into
shell surrounding and enclosing therein both the
the outer end of the mandrel bar. On the inner
mandrel bar and the piercing point during the
end of the bar cap 1 there is arranged an out
expanding operation. Consequently, the mandrel 15 wardly tapered or tang portion 9 having a rela
bar and piercing point become extremely hot and
tively small outer diameter on which the pierc
overheated after a short period of use and tend
ing point 5 is disposed. The intermediate por
to become distorted, thereby rendering them un
tion ll] of the bar cap 1 preferably has an outer
?t for further use. It is now'the general prac
diameter substantially equal to the outer diam
tice to cool the mandrel bars by making them 20 eter of the mandrel bar 6 and there is arranged
hollow and supplying a cooling .fluid thereto to
axially through the bar cap ‘I an opening or
cool the same, thereby eliminating any danger
of them becoming overheated and distorted.
passageway 12. There is disposed axially in the
inner end of the piercing point 5 an inwardly
tapered opening l3 corresponding with the out
However, no provision has been made for cooling
the piercing points, especially the outer surfaces 25 wardly tapered or tang portion 9 of the bar cap
thereof and dissipating the heat absorbed there~
1 for holding the piercing point in position there~
by from the hot steel shells or blanks.
on. There is arranged axially in the outer or
Accordingly, it is one of the objects of the ‘ forward end of the piercing’point 5, an opening
present vinvention to provide an improved means
M in which there is disposed a nozzle member
for cooling piercing points of tube or pipe rolling 30 Hi. In the piercing point 5 between the opening
mills which is very effective in its operation and
l3 in the inner end thereof and the opening M
use, thereby completely dissipating the heat
in the outer end thereof, there is arranged an
therefrom.
’
inner chamber Hi. There is disposed within the
. It is another ‘object of the present invention
mandrel bar 6 and extending through the open
to provide an improved means for cooling pierc
ing l2 in the bar cap ‘I and terminating in the
ing points of tube or pipe rolling mills which is
chamber I6 of the piercing point 5 a cooling‘
simple and inexpensive in its construction, and,
fluid supply pipe l'l having an outer diameter
at the same time, one that is rugged and easily
slightly smaller than the diameter of the axial
maintained.
'
,
opening l2 of the bar cap.
'
‘Various other objects and advantages of this
invention will become more apparent in the
course of the following speci?cation, and will be
particularly pointed out in the appended claims.
In the accompanying drawing there is shown,
for the purpose of illustration and description, 45
one embodiment which my invention may assume
in practice.
In the drawing:
_
Figure 1 is a horizontal longitudinal section
through the improved means for cooling piercing
points of my invention;
_
Figure 2 is a similar vertical section there
through; and,
Figure 3 is a sectional view taken on the line
III-III of Figure 1.
'
The nozzle member 15 disposed in the outer
end of the piercing point 5 consists of a body
portion 18 having a reduced threaded portion
on the inner end thereof which is adapted to
cooperate with an interiorly threaded portion in
the outer end of the opening !4 so as to be se
curely held therein. The outer portion IQ of the
body member. I 8 conforms substantially to the
pointed portion or forward end of the piercing
point and there is arranged therein a plurality of
angularly, radially extending passageways or jets
20 which communicate with an axially arranged
passageway 2| disposed in the body member It.
There is preferably arranged on the inner end of
the body member l8 a conical shaped screen or
55 strainer member 22 which is preferably screwed
2 -
2301,93?
forms may be devised within the scope of my
into the outer end of the passageway 2| of the
body member and preferably extends into, the
invention, as de?ned in the appended claims.
chamber it of the piercing point. There is ac
curely arranged on the outer end of the body
member l8 beyond the outer portion I! a cap
I claim:
-
.
1. In a tube rolling mill, a hollow mandrel bar,
a hollow mandrel plug arranged on the outer end
of said mandrel bar, means for supplying a cool
like member 23.
_
ing ?uid into and through said mandrel bar into
It will be understood that the cooling ?uid
the hollow interior of said plug, a nozzle member
used, preferably water, is introduced under
arranged on the extreme outer end of said plug
pressure from a source of supply into and
through the hollow mandrel bar i and bar cap ‘I 10 communicating with the hollow interior thereof,
said nozzle member having a main ?uid passage
into the inner chamber IS in the piercing point 5
way therein arranged substantially axially there
by means of the ?uid supply pipe II. The cool
ing ?uid then passes from the inner chamber I‘ , of and a plurality of radially extending ?uid pas
sageways communicating with said main ?uid
through the conical shaped screen or strainer
22 in the inner end of the nozzle I5, which sepa 15 passageway, and means arranged with said noz_ ,
zle member beyond said radially extending ?uid
rates any foreign materials from the cooling
passageways whereby said cooling ?uid as it is
?uid, into and through the passageway 2| and
delivered through and from said passageways is
out through the radially extending passageways
directed back over the exterior surface of the
or jets 2|! which deliver the cooling ?uid forcibly
therefrom against the inner walls of the cap 20 mandrel plug in substantially a circular spray.
2. In a tube rolling mill, a hollow mandrel bar,
member 23 which, in turn, directs a circular spray
of the cooling ?uid back over the piercing point 1 a hollow mandrel plug arranged on the outer end
of said mandrel bar, means for supplying a cool
to cool the same. It will be seen that, if an ex
ing ?uid into and through said mandrel bar into
cessive amount of the cooling ?uid were delivered
to the‘ inner chamber‘ it, it would over?ow and . the hollow interior of said plug, a nozzle member
arranged on the extreme outer end of said plug
pass back through the opening I2 in the bar cap
communicating with the hollow interior thereof,
‘I on/the outside of the cooling ?uid supply pipe
said nozzle member having a main ?uid passage
11 into the mandrel bar 6, thereby tending to
way therein arranged substantially axially there
dissipate any heat absorbed by the bar cap ‘I as
'well as by the mandrel bar 6. It will be noted 30 of and a plurality of radially extending ?uid pas
sageways communicating with said main ?uid
‘also that, due to the shell assuming an oval sec
passageway, and a cap member arranged with
tional conformation in the working zone, as
said nozzle member beyond said radially extend
shown in Figure 2 of‘the drawing, two cavities
ing ?uid passageways, said cooling ?uid adapted
are formed, one at each side of the shell between
the inner surface thereof and the piercing point, 35 to be delivered through said passageways and
against the interior walls of said cap member
that is, there is always a clearance therebetween
whereby it is directed thereby back over the ex
at the sides of the piercing point on which the
terior surface of the mandrel plug in substan
guides 3 are disposed during the drawing opera
tion, thereby permitting the cooling ?uid to pass
along the exterior surface of the piercing point 40
at these points so as to reach practically the en
tire exterior surface of the same.
As a result of my invention. it will be seen that
there is provided a cooling means which quickly
and effectively dissipates; the heat absorbed by
the piercing point from the hot steel shell there
by eliminating the danger of ‘the piercing point
becoming overheatéd and damaged.
tially a circular spray.
-
3. In a tube rolling mill, a. hollow mandrel bar,
a. bar cap arranged on the outer end of said man
drel bar, a mandrel plug having an inner cham
ber therein arranged on the outer end of said bar
cap, means for supplying a cooling ?uid into and
, through said mandrel bar and said bar cap into
the chamber in said piercing point, a nozzle
member arranged on the extreme outer end of
said plug, said nozzle member having a main
?uid passageway therein arranged substantially
axially thereof and communicating with the
chamber in said piercing point and a plurality of
point for the purpose of cooling the same, it will
radially extending ?uid passageways communi
be understood that my improved cooling means
cating with said main ?uid-passageway, and
can be used in connection with any other typeof
means arranged with said nozzle member beyond
point or mandrel bar plug such as, for example,
- in connection with the type of plug used on ro 55 said radially extending ?uid passageways where
by said cooling ?uid as it is delivered through
tary rolling mills for sizing and expanding pipe.
and from said passageways is directed back over
While I have shown and described one embodi
the exterior surface of the mandrel plug in sub
ment of my invention, it will be understood that
stantially a circular spray.
this embodiment is merely for the purpose of il
JOHN W. KELSO.
lustration and description and that various other 60
While the improved cooling means of my in
vention is shown incorporated with a piercing
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