US3354682A - Apparatus for forming metal tubes to the shape of a frustum of a pyramid - Google Patents
Apparatus for forming metal tubes to the shape of a frustum of a pyramid Download PDFInfo
- Publication number
- US3354682A US3354682A US448053A US44805365A US3354682A US 3354682 A US3354682 A US 3354682A US 448053 A US448053 A US 448053A US 44805365 A US44805365 A US 44805365A US 3354682 A US3354682 A US 3354682A
- Authority
- US
- United States
- Prior art keywords
- rolls
- frustum
- pyramid
- shape
- mandrel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/155—Making tubes with non circular section
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/16—Making tubes with varying diameter in longitudinal direction
- B21C37/18—Making tubes with varying diameter in longitudinal direction conical tubes
Definitions
- ABSTRACT OF THE DISCLOSURE Apparatus for producing tubular frustums of a pyramid from a tubular blank in which two spaced rolls are each provided on its periphery with an engraving of a gradually decreasing depth and breadth, the cross-sections of said engravings in transverse section cooperatively defining the outer surface of the frustum to be obtained.
- a polygonal frustopyramidal mandrel is provided having a shape matching the inner surface of the frustum to be obtained, the mandrel -being adapted to carry the tubular blank and be urged therewith through the gap between the rolls in a direction perpendicular to the plane of the axes of the rolls, to cause the blanks to engage the engravings of the rolls.
- the input and output ends of each engraving is separated by a relieved portion of the corresponding roll.
- the present invention has as an object a novel method which is much more economical because it is speedier and because it allows obtaining tubes the shape of which is perfect While their mechanical resistance is substantially increased.
- the invention consists chiefly in fitting the tubular blank, whether cylindrical or conical over a mandrel of which the outer shape of which matches that to be assumed by the inner surface of the tube when finished, after which the blank fitted on its mandrel, is caused to enter a rolling gear, preferably of the returning roll type, of which the rolls operate during a fraction of a revo1ution and return to their starting point during the idle period corresponding to the end of the operative revolution, said rolls having engravings of a gradually decreasing depth and breadth, matching the outer frustopyramidal shape to be given to the tube.
- the above-mentioned pyramidal shape is given preferably to the blank by a succession of operative steps between the rolls of several pairs of rolls.
- the gap between two rolls allows introducing between them the blank fitted on its mandrel, whereas the rotary movement of said cylinders ensuring the rol-ling procedure returns the tube forwardly during its deformation, that is, it urges the tube towards the operator whereby the tube is released at the end of its travel.
- the improved method according to the invention thus enables the inner and outer cross-sections of the tubular frusto-pyramid to be very accurately obtained. It is consequently possible to define the thicknesses of the tube at different points and in particular to remove the eXtraice thicknesses in those parts where they may occur detrimentally, that is over the fiat sections of the frustum, as a consequence of the reductions in cross-section and consequently it is possible to produce an elongation of the tube through extrusion of the metal, which may lead to a substantial increase in length, of a magnitude of 10%.
- the ridges of the mandrel are rounded and the connections between the successive flat surfaces of the engravings of the cylinders are flattened so that it is possible not only to reinforce the ridges of the finished work which forms its weakest parts, but it also allows giving the outer outline of the work a bevelled shape.
- a frustum of a pyramid may be given to the blank throughout its entire length or only over a fraction of the latter.
- FIGS. l and 2 are transverse cross-sections of the arrangement used for the execution of the invention, respectively before land during the rolling operation.
- FIG. 3 is a cross-section on a larger scale through line 3-3 of a part of FIG. 2,
- FIG. 4 illustrates on the same scale as FIG. 3, a crosssection of the finished tubular frustum of a pyramid
- FIG. 5 shows on a still larger scale, one of the ridges of the finished tubular frustum of a pyramid with further detail.
- FIGS. l to 3 designate the two rolls of a pair of rolls provided each With a recess or engraving 3, the rbottom of which is eccentric with reference to the roll.
- Said cylinders revolve in opposite directions as illustrated by the arrows x and y and they are each provided with a relieved section 4.
- the blank tube is designated by 5 and the mandrel by 6.
- each engraving is bounded by two surfaces 7 sloping at with reference to each other and at 45 with reference to a plane perpendicular to the axes of the rolls, the ends of each surface which registers with the other surface 7 or with the periphery of the cylinder, being cut off as Shown at 8.
- the parts of the engraving in the roll 1 associated with those in the roll 2 define between them an empty space having a square cross-section the corners of which are cut ofi and the depth of which decreases from the input up to the output point 10.
- the mandrel 6 is in the shape of a solid square frustum of izpyramid, the ridges of which are rounded as shown at When the end of the mandrel engages the stop 11 (FIGS. 1 and 2) defining the starting point of its path, said stop acts on an electric switch, a pneumatic valve or the like releasing means starting the rotation of the rolls.
- the blank is thus carried along W-ith its mandrel in the direction of the arrow p, that is towards the operator (FIG. 2) and the blank is thus shaped by rolling as provided by its matching intimately the ou-ter surface of the mandrel 6.
- FIG. 5 shows in cross-section a fraction of the square tube obtained. It is found that the thickness e of the fiat sections of said square is constant Iand is retained throughout the length of the tube in spite of the shrinking o-f its cross-section. Said thickness e may be even still further reduced if required. During yits shaping, the length of the tube increases, which leads to a saving of metal. In contradis'tinction, the thicknesses a, b, c Iat diierent points of the corner ridges are larger than the thickness e by reason of the large radius 15 (FIG. 4) 'assumed by the blank under the -action of the Irounded ridges of the mandrel.
- the tube to be obtained should include a frustum of a pyramid provided with an extension 14 retaining the original cylindrical shape of the blank.
- tubes of any desired cross-section in the shape of a frustum of a pyramid intended more particularly but not exclusively to serve -in the execution of -the legs of seats, tables and the like.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Of Metal (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Metal Extraction Processes (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR42008921 | 1964-04-17 | ||
FR8921A FR1401473A (fr) | 1964-04-17 | 1964-04-17 | Procédé de façonnage de tubes métalliques en vue de leur donner un profil en tronc de pyramide |
Publications (1)
Publication Number | Publication Date |
---|---|
US3354682A true US3354682A (en) | 1967-11-28 |
Family
ID=26162356
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US448053A Expired - Lifetime US3354682A (en) | 1964-04-17 | 1965-04-14 | Apparatus for forming metal tubes to the shape of a frustum of a pyramid |
Country Status (2)
Country | Link |
---|---|
US (1) | US3354682A (de) |
NL (1) | NL6504723A (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3756057A (en) * | 1970-05-11 | 1973-09-04 | Roll Forming Corp | Roll forming |
US3813911A (en) * | 1972-10-18 | 1974-06-04 | Superior Tube Co | Tube rolling mill for producing tubing with various internal configurations |
US3853310A (en) * | 1970-05-08 | 1974-12-10 | Spectra Mcintosh Corp | Taper leaf spring blank |
EP0018056A1 (de) * | 1979-04-24 | 1980-10-29 | M. &. M. Technics AG | Verfahren und Vorrichtung zum Walzen eines Rohres zu einem konischen Mast ohne Verwendung eines Innendornes |
US20080226935A1 (en) * | 2007-03-14 | 2008-09-18 | Kabushiki Kaisha Kunitec | Tubular product and manufacturing method and manufacturing device thereof |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US274964A (en) * | 1883-04-03 | Machine for rolling metal bars | ||
US480609A (en) * | 1892-08-09 | Fred nevegold | ||
US738067A (en) * | 1903-01-27 | 1903-09-01 | Jaques Reimann | Machine for profiling non-circular tubes or rods. |
US1007924A (en) * | 1910-08-06 | 1911-11-07 | Thomas Curr Jr | Tube-rolling mill. |
US1510586A (en) * | 1921-03-22 | 1924-10-07 | Leonard D Davis | Machine for forming metal tubes |
US1810885A (en) * | 1927-10-31 | 1931-06-16 | George E Neuberth | Method of tapering metal tubes |
USRE19734E (en) * | 1935-10-22 | Method of drawing tubes | ||
US2085963A (en) * | 1935-07-12 | 1937-07-06 | Pittsburgh Crucible Steel Comp | Method of making a deformed bar |
US2347904A (en) * | 1941-07-26 | 1944-05-02 | Gerald G Greulich | Method of cold-working metallic bars |
-
1965
- 1965-04-13 NL NL6504723A patent/NL6504723A/xx unknown
- 1965-04-14 US US448053A patent/US3354682A/en not_active Expired - Lifetime
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US274964A (en) * | 1883-04-03 | Machine for rolling metal bars | ||
US480609A (en) * | 1892-08-09 | Fred nevegold | ||
USRE19734E (en) * | 1935-10-22 | Method of drawing tubes | ||
US738067A (en) * | 1903-01-27 | 1903-09-01 | Jaques Reimann | Machine for profiling non-circular tubes or rods. |
US1007924A (en) * | 1910-08-06 | 1911-11-07 | Thomas Curr Jr | Tube-rolling mill. |
US1510586A (en) * | 1921-03-22 | 1924-10-07 | Leonard D Davis | Machine for forming metal tubes |
US1810885A (en) * | 1927-10-31 | 1931-06-16 | George E Neuberth | Method of tapering metal tubes |
US2085963A (en) * | 1935-07-12 | 1937-07-06 | Pittsburgh Crucible Steel Comp | Method of making a deformed bar |
US2347904A (en) * | 1941-07-26 | 1944-05-02 | Gerald G Greulich | Method of cold-working metallic bars |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3853310A (en) * | 1970-05-08 | 1974-12-10 | Spectra Mcintosh Corp | Taper leaf spring blank |
US3756057A (en) * | 1970-05-11 | 1973-09-04 | Roll Forming Corp | Roll forming |
US3813911A (en) * | 1972-10-18 | 1974-06-04 | Superior Tube Co | Tube rolling mill for producing tubing with various internal configurations |
EP0018056A1 (de) * | 1979-04-24 | 1980-10-29 | M. &. M. Technics AG | Verfahren und Vorrichtung zum Walzen eines Rohres zu einem konischen Mast ohne Verwendung eines Innendornes |
US20080226935A1 (en) * | 2007-03-14 | 2008-09-18 | Kabushiki Kaisha Kunitec | Tubular product and manufacturing method and manufacturing device thereof |
US8020422B2 (en) * | 2007-03-14 | 2011-09-20 | Kabushiki Kaisha Kunitec | Tubular product and manufacturing method and manufacturing device thereof |
Also Published As
Publication number | Publication date |
---|---|
NL6504723A (de) | 1965-10-18 |
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