US2649002A - Seamless tube drawing tool - Google Patents

Seamless tube drawing tool Download PDF

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Publication number
US2649002A
US2649002A US178687A US17868750A US2649002A US 2649002 A US2649002 A US 2649002A US 178687 A US178687 A US 178687A US 17868750 A US17868750 A US 17868750A US 2649002 A US2649002 A US 2649002A
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point
sleeve
mandrel
seamless tube
end portion
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US178687A
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Donovan P Gremling
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs

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  • This invention relates to machines for drawing seamless tubing by the axial rolling process wherein billets are forced by a ram over a point with a pair of pressure rollers traveling around the point for forming the billets into a seamless tube, and in particular this invention relates to an improved mounting for the points over which the billets are forced, wherein the point is journaled on a tubular spindle that telescopes over a mandrel with a ball thrust bearing behind the point to facilitate rotation thereof and with a cooling water opening extended into the point to hold the temperature of the point comparatively low.
  • the purpose of this invention is to reduce the friction resulting from rotation of comparatively long mounting sleeves on which points over which billets are forced are carried whereby the points rotate more freely and consequently wear longer.
  • this invention contemplates separating the points from the spindle and rotatably mounting the points on a tubular shaft with a ball thrust bearing behind the points so that the points only rotate and the rotating part is journaled against a ball thrust bearing to reduce the friction where the resulting force is applied.
  • the object of this invention is, therefore, to provide means for forming a point over which billets of seamless tube rolling mills are driven whereby the point, only, rotates and whereby means is provided for reducing the friction and temperature.
  • Another object of the invention is to provide a mounting for points of seamless tube mills wherein a cushion is provided for taking the shock load from the thrust bearing and associated parts.
  • a further object of the invention is to provide an improved mounting for the point of seamless tube mills over which billets are driven between pairs of rolls, which is of a comparatively simple and economical construction.
  • the invention embodies a conical shaped point rotatably mounted on a tubular shaft with the shaft extended from a sleeve telescoping on a spindle, with a ball thrust bearing between the point and shoulder of the sleeve and with a spring between the end of the sleeve and a shoulder of the spindle.
  • Figure 1 is a longitudinal section through a point of a seamless tube mill showing the point entering a billet being driven over the point and showing a pair of rolls that travel around the point to form the billet into a tube.
  • Figure 2 is a cross section through the point taken on line 2-2 of Figure 1.
  • the improved seamless tubing forming point of this invention includes a conical shaped point it, a shaft l l on which the point is mounted, a sleeve l2 from which the shaft extends, a ball thrust bearing [3, a mandrel I4 and a spring l5 between the inner end of the sleeve and a shoulder It on the mandrel.
  • the point It is illustrated with a substantially pointed outer end to provide a piercing point, the point may also be formed to provide a reeling point, and the slope of the point may be changed as may be desired.
  • the point it is provided with a bore I! in which the tubular shaft H is positioned and a bushing [8 may be provided at the end of the shaft.
  • the bushing [8 may be replaced with a bushing of a different size as the point wears.
  • the base of the point is provided with a oounterbore 19 to provide clearance for a set screw 20 that is threaded into the shaft H to hold the ball thrust bearing Is in position against a shoulder 2
  • the sleeve [2 is also provided with a bore 229 in which the end 23 of the mandrel 54 extends and, as illustrated in Figure 1 the mandrel is provided with an elongated slot 2 3 into which the inner end of a set screw 25, threaded in the sleeve l2 extends to key the sleeve to the spindle.
  • a space 26 is provided between the end of the spindle and inner end of the bore of the sleeve whereby the sleeve telescopes on the spindle providing a reciprocating action, thereby forming a cushion to relieve the thrust bearing [3 of the shock load.
  • the spindle is provided with an opening 27 through which cooling water passes to the bore 28 of the shaft ll upon which the point is is carried.
  • V v 1 In a seamless tube forming tool, the combination which comprises a mandrel having areduced end portion and a bore therethroug-h, a shoulder on the outer surface of the mandrel spaced from the end of the reduced end portion and a longitudinally disposed slot extended inwardly from the outer surface of the reduced end portion, a sleeve having an extended tubular shaft at one end thereof slidably mounted on the reduced end portion of the' mandrel, resilient means between the end of the sleeve and shoulder of the mandrel, a point for receiving a billet journaled on the tubular shaft of the sleeve, and a ball thrust bearing positioned between the base of the point and shoulder at the end of the sleeve, said sleeve having a set screw extended into the longitudinally disposed slot of the mandrel to limit the longitudinal movement of the sleeve on the reduced end portion.
  • a seamless tube forming tool which comprises a mandrel having" a reduced end portion and a bore therethrough, a shoulder on the outer surface of the mandrel spaced from the end of the reduced end portion and a longitudinally disposed slot extended inwardly from the outer surface of the reduced end portion, a sleeve having an extended tubular shaft at one end thereof slidably mounted on the reduced end portion of the mandrel, resilient means between the end of the sleeve and shoulder of the mandrel, a point for receiving a billet journaled on the tubular shaft of the sleeve, a ball thrust bearing positioned between the base of the point and shoulder at the end of the sleeve, said sleeve having a set screw extended into the longitudinally disposed slot of the mandrel to limit the longitudinal movement of the sleeve on the reduced end portion, and a pushing in the point positioned against the end of the tubular shaft.
  • a seamless tube forming tool which comprises mandrel having a reduced end portion and a bore therethrough, a shoulder on the outer surface of the mandrel spaced from the end of the reduced end portion and a longitudinally disposed slot extended inwardly from the outer surface of the reduced end portion, a sleeve having an extended tubular shaft at one" end thereof slidably mounted on the reduced end portion of the mandrel, resilient means between the end of the sleeve and shoulder of the mandrel, a point for receiving a billet journaled on the tubular shaft of the sleeve, a ball thrust bearing positioned between the base of the point and shoulder at the end of the sleeve, said sleeve having a set screw extended into the longitudinally disposed slot of the mandrel to limit the longitudinal moveiiintof the sleeve on the reduced end portion, a bushing in the point positioned against the end or the tubular shaft, said point having a couriter

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Description

8, 1953 D. P. GREMLING 2,649,002
SEAMLESS TUBE DRAWING TOOL Filed Aug. 10, 1950 FIIJ IN VENT OR.
Wmwvmz P firemZz'n ATTORNEYS Patented Aug. 18, 1953 UNITED STATES EATENT OFFICE SEAMLESS TUBE DRAWING TOOL Donovan P. Gremling, Shelby, Ohio Application August 10, 1950, Serial N 0. 178,687
3 Claims. (01. 80-13) This invention relates to machines for drawing seamless tubing by the axial rolling process wherein billets are forced by a ram over a point with a pair of pressure rollers traveling around the point for forming the billets into a seamless tube, and in particular this invention relates to an improved mounting for the points over which the billets are forced, wherein the point is journaled on a tubular spindle that telescopes over a mandrel with a ball thrust bearing behind the point to facilitate rotation thereof and with a cooling water opening extended into the point to hold the temperature of the point comparatively low.
The purpose of this invention is to reduce the friction resulting from rotation of comparatively long mounting sleeves on which points over which billets are forced are carried whereby the points rotate more freely and consequently wear longer.
In the conventional type of points over which billets are forced to form seamless tubing the points are provided on spindles and the length of the spindles increases the bearing surface area and at the extreme heat the rotation of the points is restricted. To obtain efiicient operation it is desired that the point rotate as freely as possible and to accomplish this purpose this invention contemplates separating the points from the spindle and rotatably mounting the points on a tubular shaft with a ball thrust bearing behind the points so that the points only rotate and the rotating part is journaled against a ball thrust bearing to reduce the friction where the resulting force is applied.
The object of this invention is, therefore, to provide means for forming a point over which billets of seamless tube rolling mills are driven whereby the point, only, rotates and whereby means is provided for reducing the friction and temperature.
Another object of the invention is to provide a mounting for points of seamless tube mills wherein a cushion is provided for taking the shock load from the thrust bearing and associated parts.
A further object of the invention is to provide an improved mounting for the point of seamless tube mills over which billets are driven between pairs of rolls, which is of a comparatively simple and economical construction.
With these and other objects and advantages in view the invention embodies a conical shaped point rotatably mounted on a tubular shaft with the shaft extended from a sleeve telescoping on a spindle, with a ball thrust bearing between the point and shoulder of the sleeve and with a spring between the end of the sleeve and a shoulder of the spindle.
Other features and advantages of the invention will appear from the following description taken in connection with the drawings wherein:
Figure 1 is a longitudinal section through a point of a seamless tube mill showing the point entering a billet being driven over the point and showing a pair of rolls that travel around the point to form the billet into a tube.
Figure 2 is a cross section through the point taken on line 2-2 of Figure 1.
Referring now to the drawings wherein like reference characters denote corresponding parts the improved seamless tubing forming point of this invention includes a conical shaped point it, a shaft l l on which the point is mounted, a sleeve l2 from which the shaft extends, a ball thrust bearing [3, a mandrel I4 and a spring l5 between the inner end of the sleeve and a shoulder It on the mandrel.
It will be understood that although the point It is illustrated with a substantially pointed outer end to provide a piercing point, the point may also be formed to provide a reeling point, and the slope of the point may be changed as may be desired.
In the design shown the point it is provided with a bore I! in which the tubular shaft H is positioned and a bushing [8 may be provided at the end of the shaft. The bushing [8 may be replaced with a bushing of a different size as the point wears. The base of the point is provided with a oounterbore 19 to provide clearance for a set screw 20 that is threaded into the shaft H to hold the ball thrust bearing Is in position against a shoulder 2| and on a bearing surface 22 between the shaft H and sleeve 12.
The sleeve [2 is also provided with a bore 229 in which the end 23 of the mandrel 54 extends and, as illustrated in Figure 1 the mandrel is provided with an elongated slot 2 3 into which the inner end of a set screw 25, threaded in the sleeve l2 extends to key the sleeve to the spindle.
A space 26 is provided between the end of the spindle and inner end of the bore of the sleeve whereby the sleeve telescopes on the spindle providing a reciprocating action, thereby forming a cushion to relieve the thrust bearing [3 of the shock load.
The spindle is provided with an opening 27 through which cooling water passes to the bore 28 of the shaft ll upon which the point is is carried.
With the parts formed in this manner a billet;
be made in the design and arrangement of the" parts without departing from the spirit of the invention.
What is claimed is: V v 1. In a seamless tube forming tool, the combination which comprises a mandrel having areduced end portion and a bore therethroug-h, a shoulder on the outer surface of the mandrel spaced from the end of the reduced end portion and a longitudinally disposed slot extended inwardly from the outer surface of the reduced end portion, a sleeve having an extended tubular shaft at one end thereof slidably mounted on the reduced end portion of the' mandrel, resilient means between the end of the sleeve and shoulder of the mandrel, a point for receiving a billet journaled on the tubular shaft of the sleeve, and a ball thrust bearing positioned between the base of the point and shoulder at the end of the sleeve, said sleeve having a set screw extended into the longitudinally disposed slot of the mandrel to limit the longitudinal movement of the sleeve on the reduced end portion.
2. In a seamless tube forming tool, the combination which comprises a mandrel having" a reduced end portion and a bore therethrough, a shoulder on the outer surface of the mandrel spaced from the end of the reduced end portion and a longitudinally disposed slot extended inwardly from the outer surface of the reduced end portion, a sleeve having an extended tubular shaft at one end thereof slidably mounted on the reduced end portion of the mandrel, resilient means between the end of the sleeve and shoulder of the mandrel, a point for receiving a billet journaled on the tubular shaft of the sleeve, a ball thrust bearing positioned between the base of the point and shoulder at the end of the sleeve, said sleeve having a set screw extended into the longitudinally disposed slot of the mandrel to limit the longitudinal movement of the sleeve on the reduced end portion, and a pushing in the point positioned against the end of the tubular shaft.
3. In a seamless tube forming tool, the combination which comprises mandrel having a reduced end portion and a bore therethrough, a shoulder on the outer surface of the mandrel spaced from the end of the reduced end portion and a longitudinally disposed slot extended inwardly from the outer surface of the reduced end portion, a sleeve having an extended tubular shaft at one" end thereof slidably mounted on the reduced end portion of the mandrel, resilient means between the end of the sleeve and shoulder of the mandrel, a point for receiving a billet journaled on the tubular shaft of the sleeve, a ball thrust bearing positioned between the base of the point and shoulder at the end of the sleeve, said sleeve having a set screw extended into the longitudinally disposed slot of the mandrel to limit the longitudinal moveiiintof the sleeve on the reduced end portion, a bushing in the point positioned against the end or the tubular shaft, said point having a couriterboi on the base and a set screw threaded in themselar shaft for securing the ball thrust bearing in position on the sleeve, I v H DONOVAN P. GREMLING.
References Cited in the file of this patent UNITED STATES PA'I EN'I S Bark et a1. July 21, 1931 Becker Die'scher Jan. 29', 1935 Indge' Aug 5,1941
FOREIGN PATENTS Country Date
US178687A 1950-08-10 1950-08-10 Seamless tube drawing tool Expired - Lifetime US2649002A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011012761A1 (en) * 2011-03-01 2012-05-24 Sms Meer Gmbh Method for producing tube blank, involves rolling heated full block, perforating heated full block to hollow block by inner tool with piercer, and deoxidizing hollow block inner surface during rolling and/or perforating

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1537207A (en) * 1924-08-22 1925-05-12 Malcolm U Wikstrom Apparatus for forming metal tubes
US1815427A (en) * 1929-12-04 1931-07-21 Nat Tube Co Plug bar for tube making machines
US1910377A (en) * 1930-03-11 1933-05-23 Becker Leo Method and apparatus for manufacturing tubes
US1989507A (en) * 1933-05-03 1935-01-29 Diescher Tube Mills Inc Rolling mill mandrel
DE686767C (en) * 1937-10-23 1940-01-16 Roehrenwerke Akt Ges Deutsche Mandrel designed for inclined rolling mills for the production of tubes
US2251885A (en) * 1941-04-25 1941-08-05 Norton Co Grinding machine footstock

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1537207A (en) * 1924-08-22 1925-05-12 Malcolm U Wikstrom Apparatus for forming metal tubes
US1815427A (en) * 1929-12-04 1931-07-21 Nat Tube Co Plug bar for tube making machines
US1910377A (en) * 1930-03-11 1933-05-23 Becker Leo Method and apparatus for manufacturing tubes
US1989507A (en) * 1933-05-03 1935-01-29 Diescher Tube Mills Inc Rolling mill mandrel
DE686767C (en) * 1937-10-23 1940-01-16 Roehrenwerke Akt Ges Deutsche Mandrel designed for inclined rolling mills for the production of tubes
US2251885A (en) * 1941-04-25 1941-08-05 Norton Co Grinding machine footstock

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011012761A1 (en) * 2011-03-01 2012-05-24 Sms Meer Gmbh Method for producing tube blank, involves rolling heated full block, perforating heated full block to hollow block by inner tool with piercer, and deoxidizing hollow block inner surface during rolling and/or perforating

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