Improvements relating to the Manufacture of Weldless Tubes.
Year: 1898

page_text: Date of Application, 20th Apr., 1898
PROVIDIUNAL DE MULTTOAITON.
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Improvements relating to the Manufacture of Weldless Tubes.
I, WILLIAM PILKINGTON, of Sandfields, Erdington, in the County of Warwick,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention consists of improvements relating to the manufacture of weld-
less tubes, my object being to pierce solid steel or other ingots and form them
into tubes by the direct application of a force such as is produced by gun-
powder or other explosive.
In the application of my invention I employ a die or dies with holder and the
like appliances such as are now used in hydraulic or other machines in which
the plug or piercing mandrel is forced through the ingot. In combination with
such dies and the like I employ a suitably constructed appliance in which
the necessary power for forcing the mandrel through the billet can be obtained,
as in the case of gunnery or ordnance, from gun-powder, dynamite,. or other
explosive, or from a gaseous explosive mixture.
By such means I pierce the ingot, and in the same manner, with other mandrels
of suitable dimensions, I enlarge or expand the hole so formed to the required
size.
.
1000
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham Agents for the Applicant.
I, WILLIAM PILKINGTON, of Sandfields, Erdington, in the County of Warwick,
Engineer, 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:-
This invention consists of improvements relating to the manufacture of weld-
less tubes, my object being to pierce solid steel or other ingots or billets and form
them into tubes by the direct application of a force such as is produced by gun-
powder or other explosives.
In carrying my invention into effect I employ a die or dies with holders and the
like appliances such as are now used in hydraulic or other machines in which
the plug or piercing mandrel is forced through the ingot. In combination with
such dies and the like I employ a suitably constructed explosion chamber in which

page_text: the necessary power for forcing the mandrel through the ingot or billet can be
generated, as in the case of gunnery or ordnance, from gun-powder, dynamite,
or other explosives, or from a gaseous explosive mixture.
By such means I pierce the ingot, and in the same manner, with other mandrels
of suitable dimensions, I enlarge or expand the hole so formed to the required
size.
The illustration on the accompanying sheet is a sectional elevation through
appliances arranged for the piercing of solid steel or other ingots or billets in
accordance with my invention.
The solid ingot or billet A is placed in a holder or container B having one
end closed by a die plate carrying a die as C. The opposite end of the ingot
holder or container B is bolted or secured to the explosive chamber D) in which
the power necessary for forcing the piercing mandrel or plug E through the
billet is generated, preferably from a compressed explosive mixture of gas
and air introduced into the space d at the back of the piston F which is connected
directly to the piercing mandrel. The explosive charge is admitted and fired
in any convenient and ordinary manner.
The piercing end of the mandrel is caused to centrally enter the ingot or
billet A by the sliding guard bush G. A buffer spring as H is disposed in the
explosion chamber as illustrated.
The return stroke of the piston F is preferably effected by means of a tail rod J
connected with a piston working within a steam cylinder, the movement being
controlled by a hand operated valve arranged in any ordinary manner.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is:-
The piercing of solid steel or other ingots or billets and the formation of tubes
therefrom by the application of an explosive force, substantially as described.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and.
13, Temple Street, Birmingham Agents for the Applicant.