US3845649A - Tube production - Google Patents

Tube production Download PDF

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Publication number
US3845649A
US3845649A US00376838A US37683873A US3845649A US 3845649 A US3845649 A US 3845649A US 00376838 A US00376838 A US 00376838A US 37683873 A US37683873 A US 37683873A US 3845649 A US3845649 A US 3845649A
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US
United States
Prior art keywords
rotation
tube
rotated
angle
tubes
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
Application number
US00376838A
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English (en)
Inventor
P Joeres
J Gerretz
F Zeunert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wean United Inc
Original Assignee
Wean United Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE2231741A priority Critical patent/DE2231741A1/de
Priority to GB1855673A priority patent/GB1428546A/en
Priority to FR7319717A priority patent/FR2190534B1/fr
Priority to CA174,716A priority patent/CA976391A/en
Priority to US00376838A priority patent/US3845649A/en
Application filed by Wean United Inc filed Critical Wean United Inc
Application granted granted Critical
Publication of US3845649A publication Critical patent/US3845649A/en
Assigned to PITTSBURGH NATIONAL BANK reassignment PITTSBURGH NATIONAL BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEAN UNITED, INC., A CORP.OF OH
Assigned to PITTSBURGH NATIONAL BANK reassignment PITTSBURGH NATIONAL BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEAN UNITED, INC., A CORP. OH.
Assigned to PITTSBURGH NATIONAL BANK reassignment PITTSBURGH NATIONAL BANK RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). RECORDED ON REEL 4792 Assignors: WEAN UNITED INC./NOW WEAN INCORPORATED PA CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B21/00—Pilgrim-step tube-rolling, i.e. pilger mills
    • B21B21/06—Devices for revolving work between the steps
    • B21B21/065—Devices for revolving work between the steps for reciprocating stands

Definitions

  • the disclosure of this invention relates to a method and apparatus for producing tubes from billets by'cold working by intermittently rotating the billets to and fro to a predetermined angle wherein the billets are first rotated a number of times in one direction throughout the cold working operation and are thereafter rotated a number of times in the opposite direction.
  • the roll gap thickening which intially occurs at each working travel is rolled out again at the next travel by the turning of the tube billet.
  • the next travel also contributes to the final rounding of the tube and to the production oif uniformity therein, more especially in regard to its internal stresses. It has been observed in the manufacture of ball bearing tubes that this uniformity of the internal stresses around the periphery of the tube can be very well produced by small angles of rotation and a progressive rotation in one direction.
  • a further aim of the invention is to find a suitable apparatus by which it is possible, by means of simple design, i.'e., involving low cost of construction, to effect a rapid adaptation to change of the angle of rotation of the product. It has hitherto been very difficult to change over a machine operating on an angle of rotation of 60 to an angle of rotation of 30 because a special rotating gearing must be provided for this purpose. Steps involving complexity of construction have been necessary so that one and the same installation can be run with one and the same angle of rotation.
  • the tube billets are first rotated a number of times in one direction, during periods when the tube and mandrel are free of the roll dies of the roll stand in first dead times between a number of rolling travels, and are thereafter turned back a number of times in the opposite direction during other free periods of the succeeding rolling strokes.
  • a cam for use in intermittently rotating to and fro tube billets, wherein the cam profile is continuous and comprises at least four circular paths, all having a common centre, each circular path being connected to an adjacent circular path by a non-circular path and wherein adjacent circular paths are at a different radius from the common center of the path.
  • an apparatus for producing tubes, wherein the cam is connected to a cam follower which is connected to a device for-rotating tube billets wherein on rotation of the cam the motion of the follower is transmitted to the tube billetrotating device causing rotation of a tube billet.
  • the invention completely obviates the thickenings occurring during rolling by repeated rotation in one direction, even with small angles of rotation, while at the same time affording the advantages of to and fro rotation.
  • the tube billet can be rotated through the same angle in each instance or the tube rotated in one direction through different angles in each instance.
  • the tube billet can be rotated at least twice, and preferably three times, in the same direction.
  • the angle of rotation or the smallest angle of rotation, can be adapted to the quality of material to be worked or to the magnitude of the forward feed, in
  • the tube billet can be rotated through about 30 to at each rotation.
  • One type of apparatus suitable for carrying out the invention is characterized in coupling a roll stand drive to a drive of a device for the rotation of tube billetsthrough a cam disc continuously rotating synchronously with the roll stand drive.
  • the closed cam path of the cam disc comprises at least four circular path sections associated with the center of rotation of the cam disc, which have in part different radii, and between these radii are provided transition curves which are synchronous with the periods during the reduction operation when the roll dies are free or out of contact with the tube.
  • the cam disc is replaceable so that it is possible to change the angle of rotation merely by replacing the cam disc.
  • the longitudinally displaceable member is in the form of a toothed rack, one end of which supports a cam disc roller following the cam disc path, and of which the teeth situated in the region of the other end are in engagement with the pinion of the rotating device.
  • FIG. 1 shows a cam disc with a toothed rack which is operable thereby and which is in engagement with a pinion;
  • FIG. 2 shows a cam disc which is driven at one-sixth of the machine speed.
  • FIG. 1 The construction illustrated in FIG. 1 comprises a cam disc 1 which is mounted on a control shaft taken from the main drive and in which a cam path 2 is cut. Bearing against this cam path 2 is a cam roller 3 secured to an appropriately mounted toothed rack 4.
  • the toothed rack 4 is in engagement with a toothed wheel mounted on a rotatable shaft 6 of a rotatable device such as a chuck. Between the shaft 6 and the device there can be arranged a multi-speed shift gear box.
  • suitable, known means for example through a rotary chuck to the workpiece (billet and finished tube).
  • the transmitting means and rotary chuck along with other well-known components are illustrated in US. Pat. No. 3,344,644 dated Oct. 3, 1967, and issued to Heinz H. Fahrenholz and entitled Pilger Rolling Mills.
  • the manner of operation of the apparatus using a cam disc according to FIG. 2 is as follows:
  • the cam disc 1 is driven at one-sixth of the speed of the machine.
  • the cam roller 3 moves a distance AC
  • the toothed rack 4 and the toothed wheel 5 travel a distance equal to AC, whereby the workpiece is turned through a particular angle chosen to correspond to the travel AC.
  • the first return travel with the travel LM i.e., the workpiece is turned back through a particular angle corresponding to the travel LM.
  • the curve MN is again an arc of a circle, and therefore the workpiece cannot be rotated in this time.
  • the workpiece is again turned back through a particular angle corresponding to the travel OP.
  • the curve PO is again an arc of a circle, because the workpiece cannot be rotated in this interval of time.
  • the third backward travel takes place along the path QS with the travel RS, whereafter the curve SC is completed again as an arc of a circle.
  • the positions for the exit dead center must be set along the line XX, YY and 22. If it is desired to operate by the method of rotation at the entry dead center and rotation at the exit dead center, it would merely be necessary to change the cam disc 1 so that it has the same speed of rotation, but then rotates six times in the forward direction and six times in the backward direction.
  • angles of rotation other than those indicated in FIG. 2 are to be used for the workpiece, it is again necessary merely to fit into the rolling mill a different cam disc having correspondingly changed lifts.
  • the wear on the outer rolling tools is rendered symmetrical and more uniform over the periphery of the groove, whereby the useful life of the outer rolling tools is increased.
  • the twist which is undesirable with various coldreduced materials in rolling can be avoided by employing, for example, a cam disc which gives a turning angle of 90 at a time.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
  • Control Of Metal Rolling (AREA)
  • Forging (AREA)
US00376838A 1972-06-26 1973-07-05 Tube production Expired - Lifetime US3845649A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE2231741A DE2231741A1 (de) 1972-06-26 1972-06-26 Verfahren zum herstellen von rohren aus rohrluppen durch kaltpilgern
GB1855673A GB1428546A (en) 1972-06-26 1973-04-17 Tube production
FR7319717A FR2190534B1 (show.php) 1972-06-26 1973-05-30
CA174,716A CA976391A (en) 1972-06-26 1973-06-22 Tube production
US00376838A US3845649A (en) 1972-06-26 1973-07-05 Tube production

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2231741A DE2231741A1 (de) 1972-06-26 1972-06-26 Verfahren zum herstellen von rohren aus rohrluppen durch kaltpilgern
US00376838A US3845649A (en) 1972-06-26 1973-07-05 Tube production

Publications (1)

Publication Number Publication Date
US3845649A true US3845649A (en) 1974-11-05

Family

ID=25763485

Family Applications (1)

Application Number Title Priority Date Filing Date
US00376838A Expired - Lifetime US3845649A (en) 1972-06-26 1973-07-05 Tube production

Country Status (5)

Country Link
US (1) US3845649A (show.php)
CA (1) CA976391A (show.php)
DE (1) DE2231741A1 (show.php)
FR (1) FR2190534B1 (show.php)
GB (1) GB1428546A (show.php)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6006575A (en) * 1999-03-25 1999-12-28 Usx Corporation Reversible mandrel bar assembly
US8402870B1 (en) * 2008-11-13 2013-03-26 Michael S. Marquette Multi-function flying notching and shearing machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1565436A (en) * 1977-10-10 1980-04-23 Gni I Pi Splav I Obrabot Tsvet Pilger rolling of tubes

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1013429A (en) * 1910-03-26 1912-01-02 Adolf Alexander Karl Nowak Rolling-mill.
US2388251A (en) * 1944-06-22 1945-11-06 Rockrite Processes Inc Tube reducing mill
US2560934A (en) * 1947-07-05 1951-07-17 Tube Reducing Corp Reducing mill drive
US3211027A (en) * 1958-06-06 1965-10-12 Blaw Knox Co Tube rolling method
US3274816A (en) * 1963-09-20 1966-09-27 Held Richard Anthony Machine for tapering tubing
US3411336A (en) * 1966-04-06 1968-11-19 Blaw Knox Co Tube rolling machine
US3416346A (en) * 1964-05-11 1968-12-17 Calumet & Hecla Method and apparatus for reducing the wall thickness of metal tubing

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1013429A (en) * 1910-03-26 1912-01-02 Adolf Alexander Karl Nowak Rolling-mill.
US2388251A (en) * 1944-06-22 1945-11-06 Rockrite Processes Inc Tube reducing mill
US2560934A (en) * 1947-07-05 1951-07-17 Tube Reducing Corp Reducing mill drive
US3211027A (en) * 1958-06-06 1965-10-12 Blaw Knox Co Tube rolling method
US3274816A (en) * 1963-09-20 1966-09-27 Held Richard Anthony Machine for tapering tubing
US3416346A (en) * 1964-05-11 1968-12-17 Calumet & Hecla Method and apparatus for reducing the wall thickness of metal tubing
US3411336A (en) * 1966-04-06 1968-11-19 Blaw Knox Co Tube rolling machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6006575A (en) * 1999-03-25 1999-12-28 Usx Corporation Reversible mandrel bar assembly
US8402870B1 (en) * 2008-11-13 2013-03-26 Michael S. Marquette Multi-function flying notching and shearing machine

Also Published As

Publication number Publication date
CA976391A (en) 1975-10-21
GB1428546A (en) 1976-03-17
DE2231741A1 (de) 1974-01-10
FR2190534B1 (show.php) 1976-09-17
FR2190534A1 (show.php) 1974-02-01

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AS Assignment

Owner name: PITTSBURGH NATIONAL BANK

Free format text: SECURITY INTEREST;ASSIGNOR:WEAN UNITED, INC., A CORP.OF OH;REEL/FRAME:004458/0765

Effective date: 19850610

AS Assignment

Owner name: PITTSBURGH NATIONAL BANK

Free format text: SECURITY INTEREST;ASSIGNOR:WEAN UNITED, INC., A CORP. OH.;REEL/FRAME:004792/0307

Effective date: 19860630

Owner name: PITTSBURGH NATIONAL BANK,PENNSYLVANIA

Free format text: SECURITY INTEREST;ASSIGNOR:WEAN UNITED, INC., A CORP. OH.;REEL/FRAME:004792/0307

Effective date: 19860630

AS Assignment

Owner name: PITTSBURGH NATIONAL BANK

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:WEAN UNITED INC./NOW WEAN INCORPORATED PA CORP.;REEL/FRAME:005004/0152

Effective date: 19881013