close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2134620

код для вставки
‘
Oct. 25, 1938.
‘ G. s. MCLAYI ‘
‘
,
. TUBULAR ARTICLE ‘MANUFACTURE
Filed March 24, 1957
2,134520
Patented Oct. 25, 1938
V‘ ‘ 2,134,620
" UNITED“: STATES
PATENT OFFICE
2,134,620 '
TUBULAR ARTICLE‘ ‘MANUFACTURE 1
Gavin Smellie McLay, Strand, London, England,
assignor to Wcllman Seaver Rolling Mill‘Com
pany Limited, London, England, [a company of
Great Britain
I Application March 24, 1937, Serial No. 132,829
-
1
In Great Britain July 30, 1936
‘
'
10 ‘Claims. (o1.v 205-4)
This invention‘relates to a method of and ap
paratus for the manufacture of metal'tubes and
other tubular metal articles hereinafter called
tubes.
‘
>
-
»
>
g
_
The apparatus is of the push bench type by
p which a somewhat thick cup-shaped hollow billet
or blank, usually termed a bottle, carried on an
end of a mandrel‘ is pushed through reducing
means, such as dies, or through passes between
rolls ‘which decrease successively in cross-sec
tional area in the forward direction, whereby the
billet is reduced in thickness and spread out
lengthwise along the mandrel until the billet is
brought to or approximately to the form of a
tube of the required ‘thickness and length. An
example of such apparatus is'described in the
speci?cation of U. S. Letters Patent-No. 1,979,579.
In a usual method of operation of such’ ap
paratus', the mandrel is removed from‘ the ap-‘
paratus, . the tube stripped therefrom and the
mandrel returned tothe'apparatus with the same
end at the front for use in the production of a
overcome this dif?culty and to provide a mandrel
which may be reversed and which will at all
times be maintained in engagement and correct
alignment with the mandrel carrier during the
pushing operation whatever shocks may be pro- 5
duced during that operation.
Experiment has shown that this purpose may
be satisfactorily effected by shaping the co-oper
ating ends of the mandrel and mandrel carrier
so that the one has, for example, a conical ex
10.
tension of less diameter at its base than the di
ameter of the mandrel and the other has a cor->
responding depression to receive said extension,
the mandrel being shaped similarly at its two
ends and having no depressions or grooves in its 15.
cylindrical face.
The present invention comprises a method of
producing metal tubes in which a closed ended
hollow blank is appliedrto one end of a mandrel
having its cylindrical surface plain without de
pressions or grooves and its opposite ends alike
and whose other end is connected to the man
drel carrier by a connection which maintains said
further tube. It is found that the mandrel be- ‘ mandrel
carrier and mandrel coaxial and which
comes non-uniformly heated which causes
is not broken when the mandrel is subjected to 25
25 changes of shape resulting in uneven wear of the
mandrel and lack of ' uniformity in successive
tubes produced.
It is an object of the'present
invention to overcome these difficulties.
_
It has been proposed in the'operation of push
bench drawing apparatus (see the speci?cation of
U. S. LettersrPa'tent No. 2,098,153) to reverse the
mandrel end for end after the formation’ and re
moval of a tube and before it is used'for the pro
shocks during the pushing operation, pushing the
blank carried on the mandrel through reducing
means to convert it to a tubular article, remov
ing said tubular article from the mandrel, revers
ing the mandrel end for end and reintroducing it 30
into the push bench apparatus for use in the
production of a further tubular article.
According to the invention also apparatus for
the production of metal tubes comprises in com
bination, a mandrel carrier, a mandrel having its 35
35
cylindrical surface plain without depressions or
their ends similar so that either end can be en- .
gaged by the mandrel carrier which operates on grooves and its opposite ends alike, a connection
the mandrel to- move it forward. A mandrel to between the front end of the mandrel carrier and
be reversed has been proposed having both ends the adjacent end of the mandrel which maintains
the mandrel carrier and mandrel coaxial and
4:0 similar and with each end formed slightly round
ed or convex to co-operate with a mandrel carrier which is not broken when the mandrel is sub
jected to shocks during the pushing operation,
having its end hollow or concave of correspond
ing shape to engage the end of the mandrel. It driving means for the mandrel, stripping means
has been found that such shaping. of the end of to remove a tube from the mandrel and means to 45
receive the mandrel and reverse it end for end‘
45 the mandrel and mandrel carrier is unsatisfac
tory in that under the shocks experienced during prior to reintroducing it in front ‘of the mandrel
duction of a second tube.
-
.
Mandrels which are to be reversed should have
the pushing operation and particularly the shock
produced when the bottle meets the ?rst die, the
‘end of the mandrel becomes disengaged from the
mandrel carrier with the result that its align
ment may become incorrect and also when the
mandrel carrier catches up and again engages
the mandrel the engagement is not correct. The
tube produced is then imperfect and not true.
55
Itis also an objectof the present inventionto'
carrier.
.
Further according to the invention a mandrel
for use with push bench apparatus has its cylin
drical wall plain without depressions or grooves, 50
and its ends shaped alike, each with a conical ex
tension or a conical depression of less diameter at
its base than the diameter of the mandrel and
of such length that it will. not be disengaged '
from a corresponding andsimilar hollow in or 55
2
..
2,134,620
extension on the end of the mandrel carrier when
subjected to shocks during the pushing operation.
The means to receive the mandrel and reverse
it end for end may comprise a turntable which
operates in a horizontal or a vertical plane.
One form of push bench plant embodying the
features of the present invention and its opera
tion will now be described by way of example
10
with a second roller conveyor table 22 con
sisting of a series of driven rollers 23.
The
with reference to the accompanying drawing,’ mandrels which have been turned round end for
wherein
end by the turntable l9 are delivered by the roller
Fig. 1 shows a diagrammatic plan of the lay
conveyor table 22 to a point opposite to a skid
out of the apparatus, and
table 24 by which they may be delivered as re
Fig. 2 shows to an enlarged scale the connec
tion between the mandrel carrier and the man
15 drel and the other end of the mandrel forced into
the metal of the bottle after it has met the ?rst
part of the reducing means.
Fig. 3 is a fragmentary view showing an alter
native form of the connection.
20
means to raise it vertically prior to its rotation.
The frame structure 20 is associated with two
sets of driven rollers 2| which assist in delivering
the mandrels to and from it. The turntable may
be operated manually or may be power driven.
The other side of the turntable I9 is in line
_
.
.
The plant comprises a push bench apparatus
having a driving rack I, a mandrel carrier 2,
a mandrel 3, and dies 4 which decrease succes
sively in cross-sectional area and which are
mounted in a ring bed 5 and, if desired, a reel
25 ing mill 6 of a known form and arranged in line.
I is the hollow billet or bottle and 8 is the tube
formed on the mandrel 3. The mandrel 3 is a
cylindrical steel bar with its cylindrical face
plain without grooves or depressions. In Fig. 2,
30 each end is formed with a conical extension 9
whose base has a diameter less than that of the
mandrel. The junction of the conical wall with
the end wall is preferably rounded as is the end
ID of the extension.
quired to the push bench apparatus. The roller
table 22 is disposed opposite to a furnace 25
into which the mandrels may be fed. The fur
nace has a sloping floor so that the mandrels
delivered to it travel across it from one side 26
to the other 21. It is provided
side with a pushing rod 28 to
from the furnace and deliver it
24 by which it is delivered toapparatus.
at the discharge
push a mandrel
to the skid table 20
the push bench
Treating the mandrels in the furnace prior
to their being reintroduced into the push bench
apparatus assists in restoring the condition of 25
the metal which may have changed due to un
even heating caused during the operation of the
of the push bench apparatus.
It will be understood that various modi?ca
tions can be made without departing from the
invention, for example, the turntable may be
arranged to operate in a vertical plane.
In use the mandrels are fed to one side of the
turntable at the same time that mandrels are
The front end of the mandrel carrier has a
removed from the other side, and preferably they
conical depression H into which the conical ex
are reversed by the turntable in groups or batches
tension 9 of the mandrel is received. The length _
of several together so that they are returned to
of the extension 9 is such that it will not become the push bench apparatus at the same rate as
disengaged from the mandrel carrier when sub
they are received from it.
40 jected to the shocks experienced in the pushing
To remove a tube from a mandrel the tube
operation. As an example for producing a tube
35
of 4.5 inches diameter at a pushing speed of 300.
feet per minute the length of the extension may
be 2 inches. The two ends of the mandrel are
exactly similar, each having a conical exten
sion 9.
In use on meeting the ?rst die the bottle 1 is
forced on to the mandrel 3 so that the conical
extension 9 is forced into the metal of the end
50 Wall of the bottle 1 as indicated in Fig. 2.
After the mandrel with the tube on it has
passed through the reeling mill 6 by which the
tube is loosened on the mandrel it is ‘delivered
to a skid table I2 by which it is delivered to
45
stripping apparatus.
The stripping apparatus
illustrated comprises a pair of gripping jaws l-3
which engage the mandrel and hold it while a
slotted plate M placed at the back of the tube 8
and attached by rods l5 to hydraulic apparatus
60 I6 is drawn back by the latter to remove the tube
from the mandrel. From the grippers l3 the
mandrel is delivered to a roller conveyor table
II which comprises a series of driven rollers I8
and is arranged in line with a turntable IS. The
65 turntable is divided longitudinally so that the
roller conveyor table I‘! delivers the mandrel
to one side of said turntable.
The turntable l9 conveniently consists of a
long frame structure 20 and it is of a Width to
70 receive a desired number of mandrels on each
side of the central division, for example 3.
It
carries on its underside rollers which run on. a
circular path carried on a frame, so that it may
easily be rotated by any ‘usual driving mecha
75. nism, and if desired it may be provided with
may be held stationary and the mandrel with
drawn forwardly from it.
The ends of the mandrel being exactly similar
either is successively engaged with the front end
of' the mandrel carrier and the connection is
such that the mandrel is not disengaged ‘from
the mandrel carrier when subjected to the shocks
received during the pushing operation.
In the alternative arrangement illustrated in
Fig. 3, each end of the mandrel 3 is formed with
a conical depression I l , the extension 9 being pro
vided on the mandrel carrier 2. This arrange
ment has advantages similar to those set forth
above.
'
What I claim is:
1. A method of producing metal tubes in
which a closed ended hollow blank is applied to
one end of a mandrel having its cylindrical sur
face plain without depressions or grooves and
having its opposite ends alike and whose other 60
end is connected to the mandrel carrier by a con
nection which maintains said‘ mandrel carrier
and mandrel coaxial and which is not broken
when the mandrel is’ subjected to shocks during
the pushing operation, pushing the blank carried 65
on the mandrel'through reducing means to ‘con
vert it to a tubular article, removing said tubu-'
lar article from the mandrel, reversing ‘the man
drel end for end and reintroducing it into the
push bench apparatus for use in the production
70
of a further tubular article.
2. A method of producing metal tubes in which
a closed ended‘hollow blank is applied to one end
of a mandrel having its cylindrical surface plain
without depressions or -g~rooves,’and having its 75
A
2,134,620
7 3
opposite ends alike andwhose other end is con
nected to the mandrel carrier by a connection
broken when the mandrel is subjected to shocks
during the pushing operation, driving means for
which is received into a similar shaped depres
sion in the other, pushing the blank‘carried on
the mandrel through reducing means to convert
it to a tubular article, removing said tubular arti
cle from thee mandrel, reversing the mandrel
end for end and reintroducing it into the push
fromthe mandrel and means to receive the man
drel and reverse it end for end prior to rein
which comprises a conical projection on one , the mandrel, stripping meansto remove a tube
troducing it in front of the mandrel carrier. ‘
6. Apparatus for the production of metal tubes
comprising in combination a mandrel carrier ele
ment, a mandrel element having its cylindrical
_ surface plain without depressions or grooves and 10
10 bench apparatus for use in the production of a
further tubular article.
‘3. A method of producing metal tubes in which
a closed ended hollow blank is applied to one
end of a mandrel having its cylindricalsurface
15 plain without depressions or grooves and having
its opposite ends alike and whose other end is
connected to the mandrel carrier by a connection
which comprises a conical projection on one
its opposite ends alike, a connection comprising
a conical extension on one of the said elements
‘received into a conical depression in the other
of the said elements, which extension at its base
is of less diameter than the diameter of the man 15
drel and is of such length that it will not be
disengaged from the. conical depression when the
mandrel is subjected to shocks during the push
ing operation, driving means for the mandrel,
which is received into a similar shaped depres—
stripping means to remove a tube from the man 20
20 sion in the other, said projection being of less ‘ drel, and means to- receive the mandrel and re
diameter at its base than the diameter of the
mandrel and of such length that it will not be verse it end for end prior to reintroducing it in
disengaged from the depression which receives front of the mandrel carrier.
it when subjected-to shocks'during the pushing
25 operation, pushing the blank carried on the man
drel through reducing means to convert it to a
tubular article, removing said tubular article
from the mandrel, reversing the mandrel end
for end ‘and reintroducing it into the push bench
30 apparatus for use in the production of a further
tubular article.
,
'
4. A method of producing metal tubes in which
a closed ended hollow blank is applied to one
end of a mandrel having its cylindrical surface
35 plain without depressions or grooves and having
its opposite. ends alike‘and whose other end is
connected to the mandrel carrier by a connection
'7. Apparatus for the. production of metal tubes
comprising in combination a mandrel carrier 25
element, a mandrel element having its cylindri
cal surface plain without depressions or grooves
and itslopposi'te ends alike, a connection com
prising a conical extension on one of the said ele
ments received in a conical depression in the other 30
of the said elements, which extension at its base
is of less diameter than the diameter of the man
drel and is of such length that it will not be dis
engaged from the conical depression when the
mandrel is subjectedto shocks during the pushing
which comprises a conical projection on one
operation, driving means for the mandrel, strip- ,
ping means to remove a tube from the mandrel,
means to receive the mandrel and reverse it end
which-is received into a similar shaped depres
sion in the other, said projection being of less
mandrel carrier, and furnace apparatus for the 40
diameter at its base than the diameter of‘ the
mandrel and of such length that it will not be
duced into the push bench apparatus.
disengaged from the depression which receives
it when subjected to shocks during the pushing
- operation, pushing the blank carried on the man
45 drel through reducing means‘ to convert it to a
tubular article, removing said tubular article
from the mandrel, reversing the mandrel end for
'end and reintroducing it into the push bench ap—‘
paratus for use in the production of a further
tubular article, and submitting the mandrel to a
heat treatment before it is reintroduced into the
push bench apparatus.
5. Apparatus for the production of metal tubes
comprising in combination, a mandrel carrier,
55 a mandrel having its cylindrical surface plain
for end prior to reintroducing it in front of the
heat treatment of a mandrel before it is reintro
8. Apparatus according to claim 6 wherein the
junction of the conical‘ extension with the wall
of the element on which it is formed, is rounded 45
and the end of the extension is also rounded.
9. A mandrel for use withpush bench appara
tus having its cylindrical wall plain without de
pressions or grooves, and its ends shaped alike,
each with a conical extension or a conical de
50
pression of less diameter at its base than the di
ameter of the mandrel and of such length that it
will not be disengaged from a corresponding and
similar hollow in or extension on the end of the
mandrel carrier when subjected to shocks dur
55
ing the pushing operation.
10. A mandrel according to claim 9, having a
without depressions or grooves and its opposite
rounded
junction of the conical extension or de
ends alike, a connection between the front end
of the mandrel carrier and the adjacent end ' pression with the end wally‘of the mandrel and a
of the mandrel which maintains the mandrel roundedend to the said extension or depression. 60
60
GAVIN SMELLIE McLAY.
carrier and mandrel coaxial and which is not
Документ
Категория
Без категории
Просмотров
0
Размер файла
647 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа