US3327512A - Fine pitch finned tubing and method of producing the same - Google Patents

Fine pitch finned tubing and method of producing the same Download PDF

Info

Publication number
US3327512A
US3327512A US421390A US42139064A US3327512A US 3327512 A US3327512 A US 3327512A US 421390 A US421390 A US 421390A US 42139064 A US42139064 A US 42139064A US 3327512 A US3327512 A US 3327512A
Authority
US
United States
Prior art keywords
tube
roll
rolls
finning
fins
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
US421390A
Other languages
English (en)
Inventor
Arthur H Novak
Jr James G Withers
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.)
WOLVERINE ACQUISITION CORP A DE CORP
Bank of Nova Scotia
Calumet and Hecla Inc
Original Assignee
Calumet and Hecla 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 BE669560D priority Critical patent/BE669560A/xx
Application filed by Calumet and Hecla Inc filed Critical Calumet and Hecla Inc
Priority to US421390A priority patent/US3327512A/en
Priority to GB25026/65A priority patent/GB1039063A/en
Priority to ES0314142A priority patent/ES314142A1/es
Priority to NL6509946A priority patent/NL6509946A/xx
Priority to SE13390/65A priority patent/SE321912B/xx
Priority to DEC37644A priority patent/DE1265696B/de
Application granted granted Critical
Publication of US3327512A publication Critical patent/US3327512A/en
Anticipated expiration legal-status Critical
Assigned to BANK OF NOVA SCOTIA, THE reassignment BANK OF NOVA SCOTIA, THE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WOLVERINE ACQUISITION CORP. A CORP. OF DE
Assigned to WOLVERINE ACQUISITION CORP., A DE CORP reassignment WOLVERINE ACQUISITION CORP., A DE CORP ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WOLVERINE TUBE, INC.,
Expired - Lifetime legal-status Critical Current

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
    • B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls
    • B21C37/205—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls with annular guides
    • 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
    • B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls
    • B21C37/207—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls with helical guides
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49377—Tube with heat transfer means
    • Y10T29/49378—Finned tube
    • Y10T29/49382—Helically finned
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49377—Tube with heat transfer means
    • Y10T29/49378—Finned tube
    • Y10T29/49385—Made from unitary workpiece, i.e., no assembly

Definitions

  • FIGURE 1 is an enlarged fragmentary sectional view illustrating the form and arrangement of the tube engaging portions of a roll.
  • FIGURE 2 is a plan view of a roll and tube in starting position.
  • FIGURE 3 is an elevational view of the roll and tube of FIGURE 2.
  • FIGURE 4 is a plan view of the roll and tube in rolling position.
  • FIGURE 5 is an elevational view of the roll and tube of FIGURE 4.
  • FIGURE 6 is a section of finned tubing produced in accordance with the present invention.
  • Integrally finned tubing has long been produced by an operation in which a tube is engaged by a plurality, usually three, finning rolls spaced uniformly about its periphery, each of the rolls being formed of a stack of discs of progressively increasing diameter positioned with their axes at skew angles with respect to the axis of the tube so that as the rolls are rotated, rotation and axial advance are transmitted to the tube and at the same time the maice terial of the tube wall is rolled into one or a plurality of continuous integral helically extending fins. It has long been recognized that the finer the pitch, the more difi'icult the manufacturing process becomes. In the interaction between the forming tools or rolls and the tube, accommV dations which are readily made for coarse pitch finning are not available in fine pitch finning.
  • fins having a pitch of down to inch become practical. While the present invention makes available for the first time a commercial offering of very fine pitch tubing, as for example from to inch, it nevertheless offers advantages in the formation of fins whose pitch is not as fine as the extremely fine pitch of the example. Actually, the present invention offers substantial commercial advantages in producing finned tubing in which the pitch is at least 15 fins per inch.
  • the present invention has particular application in the production of finned tubing of the type in which a finned section of tube is provided intermediate to adjacent plain or unfinned sections.
  • this type of tubing the production involves the feeding of the rolls radially inwardly into the tube to finning depth. This relative infeed is required to be somewhat gradual with the result that during the interval between initial contact of the rolls with the work piece and the arrival of the rolls at finning depth, there is produced on the work piece an imperfectly finned transition zone in which the fins are of gradually increasing height until at the end of the transition zone they reach full height and proper form.
  • the finning rolls which are normally driven in rotation are moved radially inwardly of the tubing from a position in clearance with respect to the tubing to a working position at finning depth.
  • the skew and taper angles are simultaneously and continuously varied so that the cutter disc or discs of the minimum diameter properly preform the fins which are subsequently developed by the action of the finishing discs of larger diameter and the misalignments which have heretofore led to shearing off of the fine pitch fins is eliminated.
  • the present invention involves a dynamic or in-process change of the taper and skew angles. It is to be sharply distinguished from the use of heads in which the taper and/or skew angles of the rolls may be adjusted beforehand.
  • FIGURE 1 shows a fragmentary sectional view through a portion of a finning roll.
  • a plurality of discs designated 10, 12, 14, and 16 all of which are of uniform thickness so as to provide a constant pitch.
  • the edges of the discs are shaped so that the discs are of progressively increasing diameter from the initial disc to the final disc 16.
  • the initial disc 16 which is referred to as a cutter disc, has its peripheral portion shaped to a relatively thin cross-section.
  • the second disc 12 while of slightly greater diameter than the disc 10, also has its peripheral portion shaped so that it too may be referred to as a cutting disc.
  • the discs 14 and 16 which are of increasing diameter, have their peripheral portions shaped more bluntly so as to provide the desired contour to the bottoms of the spaces between the fins on the tube.
  • a series or stack of four discs is illustrated but it is common to use more than four, and in fact, in FIG- URES 25, the rolls are illustrated as provided with five discs in each stack.
  • the first disc of the roll to contact the tube is the disc 16 and that the discs of successively smaller diameter; namely, the discs 14, 12 and 10, will come into operation only as the radial infeed of the tool continues.
  • the finning operation continues exactly as in the case where the end of the tube is introduced between the space between the rolls.
  • the transition zone which is formed by the rolls from the interval between initial contact between the rolls and the tube to the arrival of the rolls at finning depth, in many cases results in garbled fins and therefore a scrap work piece.
  • each of the rolls is positioned with its axis oriented with respect to the axis of the tube so as to provide an angle therebetween which is referred to herein as the skew angle.
  • This angle is determined by the pitch of the fin or fins, the number of starts or separate continuous helical fins produced on the work piece, and the diameter of the work piece. It will be observed that the skew angle increases with an increase in fin pitch, decreases with an increase in tube diameter, and is approximately doubled or trebled when changing from a single start fin to a two or three-start fin, respectively.
  • FIGURES 2 and 3 there is illustrated a section of tube T and a roll R, the roll comprising as illustrated a series of five discs 10, 12, 14, 16 and 18, mounted on an arbor 20 which is adapted to be driven in rotation by suitable means (not shown). It will be observed that the successive discs 10, 12, 14, 16 and 18 are of progressively increasing diameter.
  • the roll R has been fed radially inwardly with respect to the tube T so that initial contact has been made only between the first or cutting disc 10 of the roll, the remaining discs 12, 14, 16 and 18, as clearly seen in FIGURE 3, remaining in a position of radial clearance with respect to the tube T. It will also be observed that at this time the roll R is so oriented with respect to the tube T that its skew angle, as seen in FIGURE 2 where it is designated as the angle A1, has a positive value but less than the angle required for continuous finning when the roll R has reached full depth as may be seen by comparing FIGURES 2 and 4.
  • the orientation of the roll R with respect to the tube T is such as to provide a taper angle B1 measured in a plane at right angles to the plane containing the skew angle A1.
  • the taper angle B1 is such that initial contact between the roll R and the tube T is limited to contact of the initial or cutting disc 10 and the outer surface of the tube T.
  • the continued radial infeed of the rolls to finning depth is accomplished by a continuous change in both the skew angle and the taper angle.
  • FIGURES 4 and 5 are respectively, plane and elevational views of the roll R and tube T after the roll has arrived at its full finning depth.
  • the skew angle has increased from A1 to A2, this being the angle determined by pitch of the fins, the diameter of the tube, and the number of starts of the helical fin or fins.
  • the change in taper angle is such that when the roll R is at finning depth with respect to the tube T, the taper angle which was initially the angle B1 at contact as shown in FIG- URE 3, has now approached zero although this angle is designated B2 in FIGURE 5. This is for the reason that the taper angle, while it approaches zero, need not actually be a zero angle and instead, may have a small positive value.
  • transition Zone at the start of finning may be from one to two inches measured axially of the tube.
  • the transition Zone at the end of the finning operation is of course determined solely by the dimensions of the rolls, measured axially of the tube.
  • the skew angle A2 which prevails during the finning operation as previously discussed, is an angle whose value may be computed in accordance with fin pitch, tube diameter, and the number of starts of the fin.
  • the initial skew angle A1 must be of a value sulficient to produce appreciable axial advance of the tube and in practice, the angle A1 existing at initial contact between the roll and tube may be approximately one-half A2.
  • the angle B2 prevailing during the continuous finning operation may be zero or may be a small positive angle, as for example not ordinarily exceed ing one degree.
  • the initial taper angle B1 at the initiation of contact between the roll R and the tube T will be determined largely by the geometry of the roll and will of course be somewhat greater than the angle between a line tangent to the edge portions or tips of the discs 10, 12, 14, 16 and 18 and the axis of the roll.
  • the change in the angles from A1 to A2 and from B1 to B2 is continuous throughout the radial feed of the rolls, and preferably takes place at a uniform rate. This permits the required continuous variation in the skew and taper angles to be properly related to the infeed of the rolls by suitable camming devices.
  • FIGURE 6 there is illustrated the product produced by the practice of the present invention.
  • the tube T is illustrated as provided with plain or unfinned edge portions 22 and 24 between which is the finned portion herein designated 26.
  • the finned portion herein designated 26.
  • no effort is made to illustrate the transition zone between the unfinned portions 22 and 24 and the intermediate full finned portions of the finned zone or section 26.
  • the present invention produces fins having a fin height extending radially above the outer surface of the plain end portions 22 and 24.
  • the finning operation shall be carried out, as is well known in the art, with such reduction of tube diameter as to provide a finned portion in which the crests of the fins are of the same or of a lesser diameter than the diameter of the unfinned tube portions 22 and 24.
  • a mandrel may in some cases be located within the tubes, as is well understood in the art.
  • the method of making fine pitch finned tubing which comprises the steps of providing rotation of a plain tube and a finning roll having a plurality of discs of progressively increasing diameter, providing a relative feed motion between said tube and roll in a direction substantially radial of said tube, and decreasing the taper angle of the roll relative to said tube and increasing the skew angle of said roll relative to said tube during the feed motion.
  • the method of forming a section of fine pitch finned tubing intermediate plain section which comprises positioning a plurality of finning rolls with their axes skewed with respect to the axis of the tube and located at equal intervals around a plain tube, the rolls being formed of a series of discs of progressively increasing diameter, driving the rolls in rotation and supporting the tube for rotation and axial advance as a result of its engagement with the rotating finning rolls, feeding the rolls radially inwardly of the tube to proper finning depth, during such feed changing the angular orientation of the rolls to decrease the taper angle thereof from a taper angle at contact with the tube such that only the first disc of least diameter contacts the tube in advance of successive discs, to a taper angle not substantially greater than zero when the roll is at finning depth, continuing rotation of the rolls and tube and axial advance thereof as a result of the skew angle of the rolls, and moving the rolls radially outwardly of the tube to terminate the finned section adjacent a section of plain tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Metal Rolling (AREA)
US421390A 1964-12-28 1964-12-28 Fine pitch finned tubing and method of producing the same Expired - Lifetime US3327512A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BE669560D BE669560A (xx) 1964-12-28
US421390A US3327512A (en) 1964-12-28 1964-12-28 Fine pitch finned tubing and method of producing the same
GB25026/65A GB1039063A (en) 1964-12-28 1965-05-27 Fine pitch finned tubing and method of producing the same
ES0314142A ES314142A1 (es) 1964-12-28 1965-06-12 El metodo de hacer tubos provistos de aletas de paso fino.
NL6509946A NL6509946A (xx) 1964-12-28 1965-07-30
SE13390/65A SE321912B (xx) 1964-12-28 1965-10-15
DEC37644A DE1265696B (de) 1964-12-28 1965-12-10 Vorrichtung zum Herstellen von Rippenrohren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US421390A US3327512A (en) 1964-12-28 1964-12-28 Fine pitch finned tubing and method of producing the same

Publications (1)

Publication Number Publication Date
US3327512A true US3327512A (en) 1967-06-27

Family

ID=23670317

Family Applications (1)

Application Number Title Priority Date Filing Date
US421390A Expired - Lifetime US3327512A (en) 1964-12-28 1964-12-28 Fine pitch finned tubing and method of producing the same

Country Status (7)

Country Link
US (1) US3327512A (xx)
BE (1) BE669560A (xx)
DE (1) DE1265696B (xx)
ES (1) ES314142A1 (xx)
GB (1) GB1039063A (xx)
NL (1) NL6509946A (xx)
SE (1) SE321912B (xx)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3383892A (en) * 1965-08-13 1968-05-21 Anaconda American Brass Co Manufacture of integrally finned tubing
US3855832A (en) * 1974-01-21 1974-12-24 A Novak Method of and apparatus for manufacturing integral finned tubing
US4299106A (en) * 1978-09-22 1981-11-10 Heat Exchangers Africa Limited Finned tubing
US4366859A (en) * 1975-04-02 1983-01-04 Keyes John M Refractory heat exchange tube
DE4301668C1 (de) * 1993-01-22 1994-08-25 Wieland Werke Ag Wärmeaustauschwand, insbesondere für Sprühverdampfung
DE4404357C1 (de) * 1994-02-11 1995-03-09 Wieland Werke Ag Wärmeaustauschrohr zum Kondensieren von Dampf
DE4420756C1 (de) * 1994-06-15 1995-11-30 Wieland Werke Ag Mehrgängiges Rippenrohr und Verfahren zu dessen Herstellung
DE19529559A1 (de) * 1995-08-11 1997-02-13 Wieland Werke Ag Wärmeaustauschsystem zur Wassererwärmung
DE19757526C1 (de) * 1997-12-23 1999-04-29 Wieland Werke Ag Verfahren zur Herstellung eines Wärmeaustauschrohres, insbesondere zur Verdampfung von Flüssigkeiten aus Reinstoffen oder Gemischen auf der Rohraußenseite
EP1113237A2 (de) 1999-12-28 2001-07-04 Wieland-Werke AG Beidseitig strukturiertes Wärmeaustauscherrohr und Verfahren zu dessen Herstellung
EP1156294A2 (de) 2000-05-18 2001-11-21 Wieland-Werke AG Wärmeaustauscherrohr zur Verdampfung mit unterschiedlichen Porengrössen
US6382311B1 (en) 1999-03-09 2002-05-07 American Standard International Inc. Nucleate boiling surface
EP1223400A2 (de) 2001-01-16 2002-07-17 Wieland-Werke AG Wärmeaustauscherrohr und Verfahren zu dessen Herstellung
US6427767B1 (en) 1997-02-26 2002-08-06 American Standard International Inc. Nucleate boiling surface
US20030094272A1 (en) * 2001-11-16 2003-05-22 Karine Brand Heat-exchanger tube structured on both sides and a method for its manufacture
US20040244449A1 (en) * 2003-04-17 2004-12-09 International Roller Technology Inc. Method and apparatus to reduce slot width in tubular members
US20050204528A1 (en) * 2004-03-22 2005-09-22 Darcy Culp Method to reduce the width of a slot in a pipe or tube
US7073366B2 (en) 2004-09-16 2006-07-11 Reservior Management (Barbados) Inc. Method and apparatus to reduce the width of a slot or opening in a pipe, tube or other object
JP2014149124A (ja) * 2013-02-01 2014-08-21 Denso Corp 熱交換器用フィン一体型チューブの製造方法および製造装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3648502A (en) * 1970-03-04 1972-03-14 Trane Co Method and apparatus for forming a heat exchanger tube with closely spaced integral fins
GB2146930B (en) * 1983-09-24 1987-04-23 Eschweiler Bergwerksverein A planetary skew-rolling mill
SE509379C2 (sv) * 1996-11-12 1999-01-18 Interproperty Nv Sätt att framställa en flänsförsedd kropp, samt maskin härför

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE917724C (de) * 1945-10-01 1954-09-09 Calumet And Hecla Cons Copper Rippenrohr sowie Verfahren und Vorrichtung zur Herstellung desselben

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3383892A (en) * 1965-08-13 1968-05-21 Anaconda American Brass Co Manufacture of integrally finned tubing
US3855832A (en) * 1974-01-21 1974-12-24 A Novak Method of and apparatus for manufacturing integral finned tubing
US4366859A (en) * 1975-04-02 1983-01-04 Keyes John M Refractory heat exchange tube
US4299106A (en) * 1978-09-22 1981-11-10 Heat Exchangers Africa Limited Finned tubing
US5513699A (en) * 1993-01-22 1996-05-07 Wieland-Werke Ag Heat exchanger wall, in particular for spray vaporization
DE4301668C1 (de) * 1993-01-22 1994-08-25 Wieland Werke Ag Wärmeaustauschwand, insbesondere für Sprühverdampfung
DE4404357C1 (de) * 1994-02-11 1995-03-09 Wieland Werke Ag Wärmeaustauschrohr zum Kondensieren von Dampf
DE4404357C2 (de) * 1994-02-11 1998-05-20 Wieland Werke Ag Wärmeaustauschrohr zum Kondensieren von Dampf
US5775411A (en) * 1994-02-11 1998-07-07 Wieland-Werke Ag Heat-exchanger tube for condensing of vapor
DE4420756C1 (de) * 1994-06-15 1995-11-30 Wieland Werke Ag Mehrgängiges Rippenrohr und Verfahren zu dessen Herstellung
EP0687880A1 (de) 1994-06-15 1995-12-20 Wieland-Werke Ag Mehrgängiges Rippenrohr und Verfahren zu dessen Herstellung
US5803164A (en) * 1994-06-15 1998-09-08 Wieland-Werke Ag Multiple finned tube and a method for its manufacture
DE19529559A1 (de) * 1995-08-11 1997-02-13 Wieland Werke Ag Wärmeaustauschsystem zur Wassererwärmung
US6427767B1 (en) 1997-02-26 2002-08-06 American Standard International Inc. Nucleate boiling surface
DE19757526C1 (de) * 1997-12-23 1999-04-29 Wieland Werke Ag Verfahren zur Herstellung eines Wärmeaustauschrohres, insbesondere zur Verdampfung von Flüssigkeiten aus Reinstoffen oder Gemischen auf der Rohraußenseite
US6067832A (en) * 1997-12-23 2000-05-30 Wieland-Werke Ag Process for the production of an evaporator tube
US6382311B1 (en) 1999-03-09 2002-05-07 American Standard International Inc. Nucleate boiling surface
DE19963353A1 (de) * 1999-12-28 2001-07-26 Wieland Werke Ag Beidseitig strukturiertes Wärmeaustauscherrohr und Verfahren zu dessen Herstellung
DE19963353B4 (de) * 1999-12-28 2004-05-27 Wieland-Werke Ag Beidseitig strukturiertes Wärmeaustauscherrohr und Verfahren zu dessen Herstellung
US6488078B2 (en) 1999-12-28 2002-12-03 Wieland-Werke Ag Heat-exchanger tube structured on both sides and a method for its manufacture
EP1113237A2 (de) 1999-12-28 2001-07-04 Wieland-Werke AG Beidseitig strukturiertes Wärmeaustauscherrohr und Verfahren zu dessen Herstellung
EP1156294A2 (de) 2000-05-18 2001-11-21 Wieland-Werke AG Wärmeaustauscherrohr zur Verdampfung mit unterschiedlichen Porengrössen
US20020092644A1 (en) * 2001-01-16 2002-07-18 Andreas Beutler Heat transfer tube and a method of fabrication thereof
EP1223400A2 (de) 2001-01-16 2002-07-17 Wieland-Werke AG Wärmeaustauscherrohr und Verfahren zu dessen Herstellung
US6913073B2 (en) 2001-01-16 2005-07-05 Wieland-Werke Ag Heat transfer tube and a method of fabrication thereof
US20030094272A1 (en) * 2001-11-16 2003-05-22 Karine Brand Heat-exchanger tube structured on both sides and a method for its manufacture
US20040244449A1 (en) * 2003-04-17 2004-12-09 International Roller Technology Inc. Method and apparatus to reduce slot width in tubular members
US7146835B2 (en) 2003-04-17 2006-12-12 International Roller Technology, Inc. Method and apparatus to reduce slot width in tubular members
US20050204528A1 (en) * 2004-03-22 2005-09-22 Darcy Culp Method to reduce the width of a slot in a pipe or tube
US7069657B2 (en) 2004-03-22 2006-07-04 Reservoir Management (Barbados) Inc. Method to reduce the width of a slot in a pipe or tube
US7073366B2 (en) 2004-09-16 2006-07-11 Reservior Management (Barbados) Inc. Method and apparatus to reduce the width of a slot or opening in a pipe, tube or other object
JP2014149124A (ja) * 2013-02-01 2014-08-21 Denso Corp 熱交換器用フィン一体型チューブの製造方法および製造装置

Also Published As

Publication number Publication date
NL6509946A (xx) 1966-06-29
DE1265696B (de) 1968-04-11
BE669560A (xx)
ES314142A1 (es) 1965-10-01
GB1039063A (en) 1966-08-17
SE321912B (xx) 1970-03-23

Similar Documents

Publication Publication Date Title
US3327512A (en) Fine pitch finned tubing and method of producing the same
US3186464A (en) Thread forming screw and method and apparatus for making the same
CA1150723A (en) Heat transfer surface and method of manufacture
US4179911A (en) Y and T-finned tubes and methods and apparatus for their making
CA2150588C (en) Multiple finned tube and a method for its manufacture
US4059147A (en) Integral finned tube for submerged boiling applications having special O.D. and/or I.D. enhancement
US4796693A (en) Finned tube with indented groove base and method of forming same
US3383892A (en) Manufacture of integrally finned tubing
US3795125A (en) High-fin integral finned tube of heat-resisting alloys, and multi-pass process for making the same
US3383893A (en) Apparatus for producing integral finned tubing of fine pitch
US5010643A (en) High performance heat transfer tube for heat exchanger
US3559437A (en) Method and apparatus for making heat transfer tubing
US4353234A (en) Heat transfer surface and method of manufacture
US3600922A (en) Manufacture of integrally finned tubing
US3495429A (en) Method of reducing tubes,especially thick-walled tubes and means for practicing the method
US1982369A (en) Method and machine for making corrugated tubes
US2761336A (en) Apparatus for finning metal tubes
US4134958A (en) Method of manufacturing corrugated tubing of polytetrafluorethylene
US4571972A (en) Skewed-axis cylindrical die rolling
RU2225768C1 (ru) Способ изготовления оболочки осколочного боеприпаса
JPS62124023A (ja) スパイラルフイン付き金属管の製造方法
US3855832A (en) Method of and apparatus for manufacturing integral finned tubing
JP3345225B2 (ja) 異形管の製造方法
US4211104A (en) Cold drawing die for drawing polygonal shapes
GB2183519A (en) Method of and apparatus for producing helically finned tubes

Legal Events

Date Code Title Description
AS Assignment

Owner name: BANK OF NOVA SCOTIA, THE, 44 KING STREET, WEST, TO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WOLVERINE ACQUISITION CORP. A CORP. OF DE;REEL/FRAME:004696/0897

Effective date: 19870313

AS Assignment

Owner name: WOLVERINE ACQUISITION CORP., CORPORATION TRUST CEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WOLVERINE TUBE, INC.,;REEL/FRAME:004728/0083

Effective date: 19870318

Owner name: WOLVERINE ACQUISITION CORP., A DE CORP,DELAWARE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WOLVERINE TUBE, INC.,;REEL/FRAME:004728/0083

Effective date: 19870318