Improvements in the Treatment of Metallic Tubes, Rods, and the like to Prepare them for Cold Drawing, and Apparatus for that Purpose.
Year: 1898

page_text: Improvements in the Treatment of Metallic Tubes, Rods, and the like
to Prepare them for Cold Drawing, and Apparatus for that Purpose.
I, OLIVER IMRAY, of Birkbeck Bank Chambers, Southampton Buildings, in the
County of London, Chartered Patent Agent, do hereby declare the nature of this
invention (as communicated to me from abroad by William A. McCool, of
No. 1008, Eighth Avenue, Beaver Falls, County of Beaver, State of Pennsylvania,
United States of America, Manufacturer) to be as follows:-
This invention relates to the treatment of metallic tubes, rods, and the like
which are to be subjected to cold drawing operations, for removing rust, cinder
or other foreign substance from their surface and then coating them with lubri-
cating material before they are acted on by dies or mandrels.
The articles are first pickled in suitable chemical liquid for cleansing the sur-
faces, this being effected in an apparatus of the following description. A deep
vessel or tank, preferably cylindrical with a bottom sloping towards a central
outlet provided with a valve, has fixed at its bottom angle an annular steam pipe
having numerous holes through its upper side.
A central rod longer than any of the pipes or rods to be operated on has fixed
on it near its one end a disc with numerous perforations through it, and has also
fixed at different parts of its lengths intermediate discs with holes through them
through which the tubes or rods to be pickled can be passed. The central rod
having a shackle or other lifting appliance at its upper end, is placed in a vertical
position in the tank, its lower end resting on a step elevated a little above the
bottom of the tank, while a number of tubes or rods passed through the holes of
the intermediate discs, rest on the perforated disc near the end of the central
rod.
The tank being charged with dilute acid or other suitable chemical liquid,
steam supplied to the annular pipe at the bottom issues from the holes and creates
an upward current of the liquid near the wall of the tank, producing a corre-
sponding downward current through the tubes and through the space between
the tubes or rods, exercising a scouring as well as a chemical action. By opening
the valve at the bottom of the tank deposited matters can be run out.
The tubes or rods, after being pickled, instead of being oiled as is usually done,
are, according to this invention, coated with paraffin wax or like material by
immersing them in a tank in which it is kept in a melted condition by the heat
of a steam coil or jacket.
By using paraffin or such like material which sets solid on the pipe or rod,
instead of employing oil which is easily rubbed off, the coated articles can be
kept in store before being subjected to drawing still retaining the lubricant, and
when they are drawn, the lubricant scales off and can be collected for future use,

page_text: whereas oil, when employed for lubricating the articles become lost and covers
the tools and workshop with masses of waste oil.
Dotod this 28th day of February 1808
ABEL & IMRAY,
Agents for the Applicant.
Improvements in the Treatment of Metallic Tubes, Rods, and the like
to Prepare them for Cold Drawing, and Apparatus for that Purpose.
I, OLIVER IMRAY, of Birkbeck Bank Chambers, Southampton Buildings, in the
County of London, Chartered Patent Agent, do hereby declare the nature of this
invention (as communicated to me from abroad by William A. McCool, of
No. 1008, Eighth Avenue, Beaver Falls, County of Beaver, State of Pennsylvania,
United States of America, Manufacturer) and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:—
This invention relates to the treatment of metallic tubes, rods, and the like
which are to be subjected to cold drawing operations, for removing rust, cinder
or other foreign substance from their surface and then coating them with lubri-
cating material before they are acted on by dies or mandrels.
The articles are first pickled in suitable chemical liquid for cleansing the sur-
faces, this being effected in an apparatus which I shall describe referring to the
accompanying drawings.
Fig. 1 is a vertical section of the pickling tank. Figs. 2 and 3 are horizontal
sections on the lines and yy respectively of Fig. 1.
A is a tank containing the chemical reagent, such as dilute sulphuric or other
acid. It is preferably of sufficient height to receive the entire length of long
tubes or bars B supported by the carrier.
The tube carrier comprises a central rod C, a perforated floor D, and one or more
adjustable perforated plates E fixed at various distances from the bottom.
In the bottom of the tank A, there is a step F with a recess f to receive the end
of the central rod C. At the upper end of the rod C is a swivel at G, and
chain H by which the tube carrier can be raised and lowered.
Below the step F is a valve I which can be opened by means of a lever J when
desired. K is a perforated pipe surrounding the step and connected with a
pipe K. The effect of admitting steam is to heat the liquid and cause it to circu-
late as indicated by the arrows in Fig. 1. This circulation serves to carry the
scale or foreign materials removed from the metal surfaces by action of the
acid, to the inclined bottom of the tank, from which it can be removed by opening
the valve I from time to time.
"
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The bottom a, of the tank is inclined towards the valve so that when it is open
the escaping fluid carries with it all the deposited sediment.
The tubes or rods, after being pickled, instead of being oiled as is usually done,
are, according to this invention, coated with paraffin wax or like material by
immersing them in a tank in which it is kept in a melted condition by the heat
of a steam coil or jacket.
By using paraffin or such like material which sets solid on the pipe or rod,
instead of employing oil which is easily rubbed off, the coated articles can be
kept in store before being subjected to drawing still retaining the lubricant, and
when they are drawn, the lubricant scales off and can be collected for future use,
whereas oil, when employed for lubricating the articles become lost and covers
the tools and workshop with masses of waste oil.

page_text: Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what I claim in
respect of method and mechanism for treating metallic articles, such as tubes,
bars, rods and the like, is:-
1. The method of preparing metallic articles for the action of a draw bench
by removing "scale" and other foreign material from the surfaces of the metal
and then immersing the cleaned article in a bath of molten lubricating liquid
which when set forms a film over the surface, substantially as set forth.
2. Apparatus for removing "scale" etc. from metallic articles, by the action
of acid, comprising a tank, a carrier having a perforated bottom supporting the
articles to be cleaned, and a number of vertically adjustable retaining devices
for preventing lateral movement of the articles, substantially as described.
3. In the apparatus above referred to a perforated steam pipe causing a circu-
lation of the pickling liquid within the tank, and a valve in the sloping tank
bottom for withdrawing sediment substantially as described.
Dated this 9th day of December 1898.
ABEL & IMRAY,
Agents for the Applicant.