Improvements in Construction of Dies for the Rolling, Drawing, or Pressing of Metal Tubes or other Cylindrical Bodies, and in the Manufacture of Metal Tubes or Cylindrical Bodies
Year: 1887

page_text: Date of Application, 15th Dec., 1887
Complete Specification Left, 13th Sept., 1888
Complete Specification Accepted, 9th Nov., 1888
Improvements in Construction of Dies for the Rolling, Drawing, or
Pressing of Metal Tubes or other Cylindrical Bodies, and in the
Manufacture of Metal Tubes or Cylindrical Bodies.
1, THORSTEN NORDENFELT of 53 Parliament Street in the City of Westminster,
Civil Engineer, do hereby declare the nature of this invention to be as follows:-
Tubes and cylindrical metal articles are usually made by forcing blanks cups or
roughly shaped metal cylinders through steel or case hardened iron dies or holes by
means of a hydraulic press plunger or by a chain draw bench, tho said dies or holes
being made of a solid piece of metal which is difficult to construct and uniformly
harden or temper, moreover considerable force is required to press or pull the article
being manipulated through said dies or holes, also the tubes or cylinders frequently
adhere strongly to the punch or mandrel employed to apply the pressure.
The improvements consist in making the die or hole of a solid metal hoop or ring
holding within it exchangeable rollers or wearing parts which can be readily produced,
which can be adjusted for various sizes and diaineters of tubes and which can be
thoroughly hardened. The containing ring referred to takes the strain and the
renewable parts take the wear.
In the case of using rollers several are applied in suitable bearings fitted to interior
curve of ring radially arranged, and under or beyond the first rollers a supplementary
set of rollers are fitted so as to cover or roll over the spaces between first set of
rollers. Packings or liners are employed to set up the roller bearings.
In order not
only to extend the tube or cylinder lengthways but also to enlarge or lengthen its
circumference and so loosen it on its mandrel the rollers are applied in some cases
with their axes inclined to the direction of the mandrel the mandrel being permitted
to slightly revolve.
In the case of using stationary but exchangeable wearing parts-these are so placed
within the containing ring or hoop that they are to some extent adjustable for
various sizes of diameter of tube.
Both rollers and fixed parts readily admit of tube being withdrawn and repeatedly
passed through die without taking same off the mandrel.
Dated this 15th day of December 1887
CARPMAEL & Co.,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Construction of Dies for the Rolling, Drawing, or
Pressing of Metal Tubes or other Cylindrical Bodies, and in the
Manufacture of Metal Tubes or Cylindrical Bodies.
1, THORSTEN NORDENFELT, of 53 Parliament Street, in the City of Westminster,
Civil Engineer, do hereby declare the nature of this invention and in what manner
the same is to he performed to be particularly described and ascertained in and
by the following statement:-
:-
Tubes and cylindrical metal articles are usually made by forcing blanks cups or
roughly shaped metal cylinders through steel or case hardened iron dies or holes by
means of a hydraulic press plunger or by a chain draw bench, the said dies or holes
being made of a solid piece of metal which is difficult to construct and uniformly
harden or temper, morcover considerable force is required to press or pull the article
being manipulated through said dies or holes, also the tubes or cylinders frequently
adbere strongly to the punch or mandrel employed to apply the pressure.
The improvements consist in making the die or hole of a solid metal hoop or ring
holding within it exchangeable rollers or wearing parts which can be readily produced,
which can be adjusted for various sizes and diameters of tubes and which can be
thoroughly hardened. The containing ring referred to takes the strain and the
renewable parts take the wear.
In the case of using rollers several are applied in suitable bearings fitted to interior
curvo of ring radially arranged, and under or beyond the first rollers a supplementary
set of rollers are fitted so as to cover or roll over the spaces between first set of rollers.
Packings or liners are employed to set up the roller bearings. In order not only to
extend the tube or cylinder lengthways but also to enlarge or lengthen its circum-
ference and so loosen it on its mandrel the rollers are applied in some cases with their
axes inclined to the direction of the mandrel the mandrel being permitted to slightly
revolve.
In the case of using stationary but exchangeable wearing parts these are so placed
within the containing ring or hoop that they are to some extent adjustable for various
sizes of diameter of tube.
Both rollers and fixed parts readily admit of tube being withdrawn and repeatedly
passed through die without taking same off the mandrel.
In order that my said invention may be more fully understood and readily carried
into effect I will proceed to describe the drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a vertical section of a pair of dies constructed in accordance with my
invention.
Figure 2 is a plan of the same.
Figures 3, 4 and 5 are back clevations of some of the rollers.
A A is a solid metal boop or ring of a strength sufficient to sustain the strain of

page_text: within this ring, and in these blocks the rollers C, C, are mounted; they are arranged
in two tiers and filling pieces can be inserted behind the blocks to adjust the rollers to
the positions required nearer to or further from the centre. The rollers are set
obliquely so that they tend to turn the tube forced between them and so to loosen it
from the mandrel upon which it is carried. The Figures 3, 4 and 5 represent back
elevations of the rollers. The die is employed in the hydraulic press in the same way
as dies all in one piece are now employed, but it performs the work much more
readily and with loss power. In place of rollers I can use stationary blocks of similar
form but rollers are to be preferred.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. Dies for rolling, drawing or pressing metal tubes or cylinders consisting of a
ring of sufficient strength to sustain the strain and containing within it rollers or
exchangeable wearing parts substantially as described.
2. Dies for rolling, drawing or pressing metal tubes or cylinders having rollers or
renewable wearing parts obliquely set so as to effect the loosening of the tube or
cylinder upon its mandrel substantially as described.
3. The manufacture of metal tubes or cylinders by means of dies substantially as
described.
'
Cantambor 1980