US3267564A - Method of producing duplex internally finned tube unit - Google Patents

Method of producing duplex internally finned tube unit Download PDF

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US3267564A
US3267564A US362029A US36202964A US3267564A US 3267564 A US3267564 A US 3267564A US 362029 A US362029 A US 362029A US 36202964 A US36202964 A US 36202964A US 3267564 A US3267564 A US 3267564A
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tube
drawing
method
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John M Keyes
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WOLVERINE ACQUISITION CORP A DE CORP
Calumet and Hecla Inc
BANK OF NOVA SCOTIA
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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.,
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/001Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by extrusion or drawing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
    • B21C1/22Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00Extruding metal; Impact extrusion
    • B21C23/02Making uncoated products
    • B21C23/04Making uncoated products by direct extrusion
    • B21C23/08Making wire, bars, tubes
    • B21C23/10Making finned tubes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00Extruding metal; Impact extrusion
    • B21C23/22Making metal-coated products; Making products from two or more metals
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06Manufacture 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
    • B21C37/15Making tubes of special shape; Making tube fittings
    • B21C37/154Making multi-wall tubes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06Manufacture 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
    • B21C37/15Making tubes of special shape; Making tube fittings
    • B21C37/20Making 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
    • B21C37/202Making 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 guides parallel to the tube axis
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00Making other particular articles
    • B21D53/02Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/06Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of metal tubes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00Tubular elements; Assemblies of tubular elements
    • F28F1/10Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/40Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/18Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
    • F28F13/185Heat-exchange surfaces provided with microstructures or with porous coatings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F28F19/06Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081Heat exchange elements made from metals or metal alloys
    • F28F21/084Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081Heat exchange elements made from metals or metal alloys
    • F28F21/085Heat exchange elements made from metals or metal alloys from copper or copper alloys
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S29/00Metal working
    • Y10S29/047Extruding with other step
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/4935Heat exchanger or boiler making
    • Y10T29/49361Tube inside tube
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/4935Heat exchanger or boiler making
    • Y10T29/49377Tube with heat transfer means
    • Y10T29/49378Finned tube
    • Y10T29/49384Internally finned
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49826Assembling or joining
    • Y10T29/49908Joining by deforming
    • Y10T29/49925Inward deformation of aperture or hollow body wall
    • Y10T29/49927Hollow body is axially joined cup or tube
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49826Assembling or joining
    • Y10T29/49908Joining by deforming
    • Y10T29/49925Inward deformation of aperture or hollow body wall
    • Y10T29/49934Inward deformation of aperture or hollow body wall by axially applying force

Description

Aug. 23, 1966 J KEYEs 3,267,564

METHOD OF PRODUCING DUPLEX INTERNALLY FINNED TUBE UNIT Filed April 25. 1964 lNVE/VTOR JOH -KEYES 19y A w A T TORNEVS United States Patent M 3,267,564 METHOD OF PRODUCING DUPLEX ENTERNALLY FINNED TUBE UNIT John M. Keyes, Northville, Mich., assignor to Calumet &

Hecla, Inc., Allen Park, Mich., a corporation of Michigan Filed Apr. 23, 1964, Ser. No. 362,029 6 Claims. (Cl. 29157.3)

The present invention relates to an improved method of producing duplex internally finned tube units for use in heat exchange installations. More particularly, the method deals with the production of a tube unit constituted by an external shroud tube of a metal impervious to deterioration in its surrounding environment, and an internal finned liner tube of a different metal which is also especially well suited for exposure to a fluid medium contained in or traversing the interior of the tube unit.

It is a general object of the present invention to provide a method which in particular enables the production of the liner tube of the unit, by initial extrusion and a subsequent drawing operation, in a very close spacing of its internal fin formations relative to one another, such as could not be accomplished by a single extruding operation using presently available equipment or tubing.

More specifically, the method of the invention contemplates the initial extrusion of the liner tube in an outer diameter substantially exceeding its ultimate OD, and with its internal, longitudinally extending radial fins disposed in a circumferential and radially spacing of their inner ends which is substantially greater than in the final tube product, this operation being followed by a drawing of the initial tube to reduce its O.D. to the desired ultimate dimension, while at the same time bringing the ends of its radial fins toward one another, in both the radial and circumferential senses, to the desired spacing thereof.

A further object of the invention is to provide a method of producing a dual or duplex tube unit including an internally finned liner tube formed as just described, in which an outer shroud tube of a different material is drawn or sunk onto the liner tube in a manner to produce an extremely tight interface contact between the smooth outer surface of the liner tube and the smooth inner surface of the shroud tube, thus promoting very efficient heat transfer by the duplex tube unit.

Still more specifically, in accordance with the improved method the inner, internally finned liner tube is of a metal not only metallurgically suited to its environment of exposure but also possesses substantially greater yield strength than the different metal of the outer shroud tube, Thus, upon termination of the final drawing or sinking operation performed on the telescoped tubes, both thereof tend to spring back or outwardly; but because of its greater yield strength than the outer tube, this tendency is stronger in the inner tube, so that a strong and continuing pressure grip exists at the contacting interface of the tubes.

In yet another aspect, the invention contemplates the aging of the internal liner tube, which is preferably of aluminum, prior to its drawn or sunk union with the shroud tube, which is preferably of copper. In this connection, the initial drawing or sinking of the aluminum liner substantially increases its hardness and strength by work hardening, thus supplementing the age hardening effect.

The foregoing as well as other objects will become more apparent as this description proceeds, especially when con- Patented August 23, 1966 sidered in connection with the accompanying drawing illustrating the invention, wherein:

FIG. 1 is an enlarged scale view, in section in a transverse radial plane at to its axis, of a typical finned internal liner tube as extruded initially for the purposes of the invention;

FIG. 2 is a similar view showing a liner tube'as preliminarily drawn to reduce its outer diameter and modify the relationship to one another of its internal fin formations; and

FIG. 3 is a further similar cross sectional view showing the modified liner of FIG. 2 as finally associated with the outer shroud tube of the tube unit.

In various heat transfer applications, such for example as one utilizing water chiller tubes of a relatively small O.D., it is desirable to employ a double or duplex tube unit, including an inner tube component able to resist corrosive deterioration and having circumferentially spaced, longitudinally extending fins radiating inwardly from its inner surface, and an outer tube component also suited for the environment to which it is exposed. The extrusion procedure is obviously best suited to the production of an internally finned inner or liner tube of the above general description, and an aluminum alloy having the desired metallurgical resistance to attack can be readily extruded. However, in the small diameter size involved, for example about 4 inch outer diameter, of the ultimate duplex tube unit, it is impossible, using presently available extrusion tooling, to produce such a tube size which still has the internal finning in the desired close central spacing, radius-andcircumference-wise, of the inner ends of the fin formations.

It is in the production of such tube unit sizes that the method of the present invention comes into play; as well as in the accomplishment of a very tight contact of interface surfaces of the liner and shroud tube components to insure highly efficient heat transfer capacity.

The reference numeral 10 in FIG. 1 generally designates a liner tube as inwardly extruded from an aluminum alloy, such as alloy 6063-T5. In a typical production of a final duplex tube unit of the approximate /1v inch outer diameter instanced above, liner tube 10 will, as extruded, have an OD, say, of 0.805 inch, and a wall thickness of 0.025 inch. This tube may, utilizing existing extrusion tooling, be produced in the diameter and wall dimension indicated, and also may be provided with different types of integral, internal fin formations 12, 14, respectively, projecting radially inwardly toward the tube axis A and extending continuously along the length of the extrusion.

Thus, larger radial fins 12 of the initial liner extrusion 10 of FIG. 1 are shown to extend a radial distance a of 0.282 inch (from the inner surface of the tube wall 16; and the smaller fin formations 14 will, for example, have a corresponding dimension b of 0.080 inch. The large fins 12 are shown as having corrugated or zig-zag sides 18 and 20, but this is of no particular significance in the present invention.

As also shown in FIG. 1, the pointed ends 20 of fins 12 terminate a radical distance c of 0.096 inch from the tube axis A; and the circumferential spacing of the termini 20 of successive fins 12 from one another is sufficiently great to permit extrusion by tooling equipment capable of successfully producing the relatively small dimensions mentioned. This circumferential spacing is later reduced substantially, as will be described.

The overall circumferential width d of the larger fins 12 amounts to 0.046 inch in the typical tube under condsideration. These fins are angularly spaced 72 from one another, with the smaller fins ll l intervening therebetween at intervals of 24.

As thus produced, the tube extrusion is next subjected to drawing in a die which will reduce its outer diameter to, say, 0.680 inch, as shown in FIG. 2 Olf the drawing. Dimensions of the tube other than its O.D. remain the same, but the result of the drawing just mentioned is to bring the ends 20 of the larger fins 12 substantially toward one another, to the extent that the circumferential spacing e between successive fin end means amounts to a desired value of 0.040 inch, a relationship incapable of accomplishment by the usually available extrusion equipment alone. The reduced tube is designated 22, and the reduction of its O.D. amounts to about 15%.

So reduced, the liner tube is telescoped within an outer shroud tube 24 (FIG. 3) of copper, for example, a DHP copper chosen in part for its suitability for exposure in the intended environment. The telescoped interfit is a fairly loose one in the interest of ease of assembly; and the assembled tubes 22, 24 are then submitted to a further drawing operation in an appropriately sized die. Assuming the thickness of the wall of shroud tube 22 to be, say, 0.036 inch, the die will be of a diameter, for example 0.750 inch or less, such as to sink the two tubes beneath their overall outer diameter amounting to 0.752 inch, to which dimension the tubes spring back following the final drawing.

In accordance with the invention, the method contemplates an intervening alge hardening of the aluminum liner following its initial extrusion and preliminary draw- .ing and prior to its sinking assembly to the copper tube 24, for the purpose of improving its pressurestressed bond to tube 24 :to complete the final duplex tube, which is generally designated in FIG. 3 by the reference numeral 26. Thus, a heat treat of liner tube 22 at 350 F. for eight hours produces a T5 hardness.

As indicated above, the choice of the metal for the respective tubes 22, 24, or other different metals otherwise suited for the intended purpose, is in part governed by their respective yield strengths; and in accordance with the invention the yield strength of the inner tube should be substantially greater than that of the outer. For the selected aluminum alloy liner 22, the yield strength approximates 16,000 p.s.i., while the yield strength of the copper of outer shroud 24 approximates 9,000 p.s.i. Thus, following the final drawing or sinking of the telescoped tubes 22, 24, the former, by reason of its much greater yield strength than the outer tube 24, has a substantially greater tendency to spring back outwardly than the copper shroud; and the greater springback force of liner 22 creates a continuing, strongly stress-pressurized contact of the mating smooth tube surfaces at their interface.

Non-ferrous alloys other than those referred to above may be employed, and particularly in the case of the outer shroud tube, for example, brass, a c0pper-nickel alloy, or the like.

The aging step of the operation is of significance in increasing the hardness of the pre-extruded and pre-drawn liner tube 22, to increase its hardness and ductile strength, which increase is also contributed to by the drawing of the extrusion to the form of FIG. 2. Thus, the drawing and aging steps are seen to be complementary to one another, and in certain eases the work hardening in the draw will sufiice to produce adequate hardness and yield strength, so that aging need not be resorted to.

The method of the invention is rapidly and efiiciently performed on standard extrusion and drawing equipment, extending the field of use to :the production of integrally and internally finned tube units of small diameter incitpable of present day production by extrusion tooling a one.

What I claim as my invention is:

1. A method of producing an internally finned tube unit, comprising extruding a first metal tube to provide fins predeterminedly spaced circumferentially about and projecting inwardly of the inner surface of said tube, drawing said tube. to reduce the outer diameter thereof and bring the inner extremities of said spaced fins radially and circumferentially closer to one another than was practically possible in said extruding of said first tube, telescoping said first tube within a second tube of metal, and sinking said telescoped tubes to bring the same in tight contact with one another.

2. A method of producing an internally finned tube unit, comprising extruding a first metal tube to provide fins predeterminedly spaced circumferentially about and projecting inwardly of the inner surface of said tube, drawing said tube to reduce the outer diameter thereof and bring the inner extremities of said spaced fins radially and circumferentially closer to one another than was practically possible in said extruding of said first tube, the metal of said first tube having a given yield strength after the drawing, telescoping said first tube within a second tube of metal having a yield strength less than that of said extruded and drawn first tube, and sinking said telescoped tubes to bring the same in continuing tight pressure contact with one another.

3. A method of producing an internally finned tube unit, comprising extruding a first non-ferrous metal tube to provide fins predeterminedly spaced circumferentially about and projecting inwardly of the inner surface of said tube, drawing said tube to reduce the outer diameter thereof and bring the inner extremities of said spaced fins radially and circumferentially closer to one another than was practically possible in said extruding of said first tube, the metal of said first tube having a given yield strength after the drawing, telescoping said first tube within a second tube of a different non-ferrous metal having a yield strength less than that of said extruded and drawn first tube, and sinking said telescoped tubes to bring the same in continuing tight pressure contact with one another.

4. A method of producing an internally finned tube unit, comprising extruding a first, externally smooth surfaced non-ferrous metal tube to provide fins predeterminedly spaced circumferentially about and projecting inwardly of the inner surface of said tube, drawing said tube to reduce the outer diameter thereof and bring the inner extremities of said spaced fins radially andcircumferentially closer to one another than was practically possible in said extruding of said first tube, the metal of said first tube having a given yield strength after the drawing, telescoping said first tube within a second, internally smooth surfaced tube of a different nonferrous metal having a yield strength less than that of said extruded and drawn first tube, and sinking said telescoped tubes to bring the same in continuing tight pressure conta t with one another at the interface thereof.

5. A method of producing an internally finned tube unit, comprising extruding a first tube of aluminum to provide fins predeterminedly spaced circumferentially about and projecting inwardly of the inner surface of said tube, drawing said tube to reduce the outer diameter thereof and bring the inner extremities of said spaced fins radially and circumferentially closer to one another than was practically possible in said extruding of said first tube, telescoping said first tube within a second tube of copper, and sinking said telescoped tubes to bring the same in continuing tight pressure contact with one another due to the differential in the yield strength of the metals thereof.

6. A method of producing an internally finned tube unit, comprising extruding a first, externally smooth surfaced tube of aluminum to provide fins predeterminedly spaced circumferentially about and projecting inwardl of the inner surface of said tube, drawing said tube to re- References Cited by the Examiner UNITED STATES PATENTS 813,918 2/1906 Schmitz. 5 1,441,459 1/1923 Small.

3,009,484 11/ 1961 Dollens.

FOREIGN PATENTS 526,593 9/ 1940 Great Britain.

10 CHARLIE T. MOON, Primary Examiner.

Claims (1)

1. A METHOD OF PRODUCING AN INTERNALLY FINNED TUBE UNIT, COMPRISING EXTRUDING A FIRST METAL TUBE TO PROVIDE FINS PREDETERMINEDLY SPACED CIRCUMFERENTIALLY ABOUT AND PROJECTING INWARDLY OF THE INNER SURFACE OF SAID TUBE, DRAWING SAID TUBE TO REDUCE THE OUTER DIAMETER THEREOF AND BRING THE INNER EXTREMITIES OF SAID SPACED FINS RADIALLY AND CIRCUMFERENTIALLY CLOSER TO ONE ANOTHER THAN WAS PRACTICALLY POSSIBLE IN SAID EXTRUDING OF SAID FIRST TUBE, TELESCOPING SAID FIRST TUBE WITHIN A SECOND TUBE OF METAL, AND SINKING SAID TELESCOPED TUBES TO BRING THE SAME IN TIGHT CONTACT WITH ONE ANOTHER.
US362029A 1964-04-23 1964-04-23 Method of producing duplex internally finned tube unit Expired - Lifetime US3267564A (en)

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Application Number Priority Date Filing Date Title
US362029A US3267564A (en) 1964-04-23 1964-04-23 Method of producing duplex internally finned tube unit
GB713565A GB1058409A (en) 1964-04-23 1965-02-18 Method of producing duplex internally finned tube unit
SE503965A SE310479B (en) 1964-04-23 1965-04-15
DE19651452244 DE1452244A1 (en) 1964-04-23 1965-04-22 Double-tube assembly with internal ribs and process for its preparation
FR7821A FR1425924A (en) 1964-04-23 1966-03-03 A method of manufacturing a composite wall pipe, internally lined with fins

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DE (1) DE1452244A1 (en)
FR (1) FR1425924A (en)
GB (1) GB1058409A (en)
SE (1) SE310479B (en)

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3570593A (en) * 1968-02-05 1971-03-16 Trane Soc Heat-exchanger
US3833987A (en) * 1971-02-10 1974-09-10 Hudson Products Corp Finned tubes for use in heat exchangers
US4087893A (en) * 1974-11-08 1978-05-09 Nippon Gakki Seizo Kabushiki Kaisha Process for producing a heat pipe
US4204309A (en) * 1977-05-13 1980-05-27 Compagnie Generale Des Etablissements Michelin Process of fabricating hollow bead rings
US4256083A (en) * 1979-01-08 1981-03-17 Wilson Charles P Firebox
US4313301A (en) * 1979-10-25 1982-02-02 Caterpillar Tractor Co. Rotating fluidized bed heat exchanger
US4337824A (en) * 1980-10-24 1982-07-06 Amtrol Double wall heat exchanger
US4476704A (en) * 1980-12-24 1984-10-16 Wieland-Werke Ag Method for producing finned tubes
US4479359A (en) * 1980-10-01 1984-10-30 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Atmospheric heaters
US4546819A (en) * 1984-02-10 1985-10-15 Amtrol Inc. Double wall heat exchanger
US4657074A (en) * 1985-02-27 1987-04-14 Diesel Kiki Co., Ltd. Heat exchanger for combustion heater
US4677724A (en) * 1983-12-05 1987-07-07 Takanori Kuroki Heat exchanger structure and method of manufacturing same
US5409675A (en) * 1994-04-22 1995-04-25 Narayanan; Swami Hydrocarbon pyrolysis reactor with reduced pressure drop and increased olefin yield and selectivity
US5687677A (en) * 1995-05-22 1997-11-18 Delaware Capital Formation, Inc. Heat exchange tube and method of making same
US6070657A (en) * 1994-03-24 2000-06-06 Hoval Interliz Ag Heat exchanger tube for heating boilers
US6230511B1 (en) * 1997-08-26 2001-05-15 Lg Electronics, Inc. Evaporator in refrigerator
US6533030B2 (en) * 2000-08-03 2003-03-18 F.W. Brokelmann Aluminiumwerk Gmbh & Co. Kg Heat transfer pipe with spiral internal ribs
US6644358B2 (en) 2001-07-27 2003-11-11 Manoir Industries, Inc. Centrifugally-cast tube and related method and apparatus for making same
US20060201451A1 (en) * 2004-07-13 2006-09-14 Unical Ag S.P.A. Pipe in a fire tube boiler
US20060219191A1 (en) * 2005-04-04 2006-10-05 United Technologies Corporation Heat transfer enhancement features for a tubular wall combustion chamber
WO2006111315A1 (en) * 2005-04-18 2006-10-26 Unical Ag S.P.A. Protected carbon steel pipe for fire tube heat exchange devices, particularly boilers
US20070089868A1 (en) * 2005-10-25 2007-04-26 Hitachi Cable, Ltd. Heat transfer pipe with grooved inner surface
US20070224565A1 (en) * 2006-03-10 2007-09-27 Briselden Thomas D Heat exchanging insert and method for fabricating same
US20070259156A1 (en) * 2006-05-03 2007-11-08 Lucent Technologies, Inc. Hydrophobic surfaces and fabrication process
US20120048525A1 (en) * 2008-07-22 2012-03-01 Tai-Her Yang Conducting type inter-piping fluid thermal energy transfer device
US20120285190A1 (en) * 2010-01-13 2012-11-15 Mitsubishi Electirc Corporation Heat transfer pipe for heat exchanger, heat exchanger, refrigeration cycle apparatus, and air-conditioning apparatus
EP2814910A4 (en) * 2012-02-17 2015-11-11 Ceramatec Inc Advanced fischer tropsch system
USD837357S1 (en) * 2016-09-15 2019-01-01 Ngk Insulators, Ltd. Catalyst carrier for exhaust gas purification
USD837356S1 (en) * 2016-09-15 2019-01-01 Ngk Insulators, Ltd. Catalyst carrier for exhaust gas purification
USD841145S1 (en) * 2016-09-15 2019-02-19 Ngk Insulators, Ltd. Catalyst carrier for exhaust gas purification

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US4216575A (en) * 1979-02-01 1980-08-12 Noranda Mines Limited Method of reforming the fins of a finned tube
DE19612470A1 (en) * 1996-03-28 1997-10-02 Km Europa Metal Ag Exchanger
KR101287707B1 (en) * 2011-11-14 2013-08-07 최성환 Heat exchanger pipe and manufacturing method therefor

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US813918A (en) * 1899-12-29 1906-02-27 Albert Schmitz Tubes, single or compound, with longitudinal ribs.
US1441459A (en) * 1921-02-04 1923-01-09 Philadelphia Bronze Bearing & Composite tube and method of making the same
GB526593A (en) * 1938-03-23 1940-09-20 Felten & Guilleaume Carlswerk Improvements in and relating to aluminium pipes
US3009484A (en) * 1958-09-08 1961-11-21 Arvin Ind Inc Sound attenuating laminated pipe

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Publication number Priority date Publication date Assignee Title
US813918A (en) * 1899-12-29 1906-02-27 Albert Schmitz Tubes, single or compound, with longitudinal ribs.
US1441459A (en) * 1921-02-04 1923-01-09 Philadelphia Bronze Bearing & Composite tube and method of making the same
GB526593A (en) * 1938-03-23 1940-09-20 Felten & Guilleaume Carlswerk Improvements in and relating to aluminium pipes
US3009484A (en) * 1958-09-08 1961-11-21 Arvin Ind Inc Sound attenuating laminated pipe

Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3570593A (en) * 1968-02-05 1971-03-16 Trane Soc Heat-exchanger
US3833987A (en) * 1971-02-10 1974-09-10 Hudson Products Corp Finned tubes for use in heat exchangers
US4087893A (en) * 1974-11-08 1978-05-09 Nippon Gakki Seizo Kabushiki Kaisha Process for producing a heat pipe
US4204309A (en) * 1977-05-13 1980-05-27 Compagnie Generale Des Etablissements Michelin Process of fabricating hollow bead rings
US4256083A (en) * 1979-01-08 1981-03-17 Wilson Charles P Firebox
US4313301A (en) * 1979-10-25 1982-02-02 Caterpillar Tractor Co. Rotating fluidized bed heat exchanger
US4479359A (en) * 1980-10-01 1984-10-30 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Atmospheric heaters
US4337824A (en) * 1980-10-24 1982-07-06 Amtrol Double wall heat exchanger
US4476704A (en) * 1980-12-24 1984-10-16 Wieland-Werke Ag Method for producing finned tubes
US4677724A (en) * 1983-12-05 1987-07-07 Takanori Kuroki Heat exchanger structure and method of manufacturing same
US4546819A (en) * 1984-02-10 1985-10-15 Amtrol Inc. Double wall heat exchanger
US4657074A (en) * 1985-02-27 1987-04-14 Diesel Kiki Co., Ltd. Heat exchanger for combustion heater
US6070657A (en) * 1994-03-24 2000-06-06 Hoval Interliz Ag Heat exchanger tube for heating boilers
US5409675A (en) * 1994-04-22 1995-04-25 Narayanan; Swami Hydrocarbon pyrolysis reactor with reduced pressure drop and increased olefin yield and selectivity
US5687677A (en) * 1995-05-22 1997-11-18 Delaware Capital Formation, Inc. Heat exchange tube and method of making same
US6230511B1 (en) * 1997-08-26 2001-05-15 Lg Electronics, Inc. Evaporator in refrigerator
US6533030B2 (en) * 2000-08-03 2003-03-18 F.W. Brokelmann Aluminiumwerk Gmbh & Co. Kg Heat transfer pipe with spiral internal ribs
US20100275753A1 (en) * 2001-07-27 2010-11-04 Manoir Industries, Inc. Centrifugally-cast tube and related method and apparatus for making same
US20060062646A1 (en) * 2001-07-27 2006-03-23 Manoir Industries, Inc. Centrifugally-cast tube and related method and apparatus for making same
US20090175697A1 (en) * 2001-07-27 2009-07-09 Manoir Industries, Inc. Centrifugally-cast tube and related method and apparatus for making same
US20090158807A1 (en) * 2001-07-27 2009-06-25 Manoir Industries, Inc. Centrifugally-cast tube and related method and apparatus for making
US8033767B2 (en) 2001-07-27 2011-10-11 Manoir Industries, Inc. Centrifugally-cast tube and related method and apparatus for making same
US6644358B2 (en) 2001-07-27 2003-11-11 Manoir Industries, Inc. Centrifugally-cast tube and related method and apparatus for making same
US20070178328A1 (en) * 2001-07-27 2007-08-02 Manoir Industries, Inc. Centrifugally-cast tube and related method and apparatus for making same
US8070401B2 (en) 2001-07-27 2011-12-06 Manoir Industries, Inc. Apparatus for making centrifugally-cast tube
US20100215454A1 (en) * 2001-07-27 2010-08-26 Manoir Industries, Inc. Centrifugally-cast tube and related method and apparatus for making same
US20060201451A1 (en) * 2004-07-13 2006-09-14 Unical Ag S.P.A. Pipe in a fire tube boiler
EP1617139B1 (en) 2004-07-13 2016-08-31 UNICAL AG S.p.A. Pipe in a fire tube boiler
US7464537B2 (en) * 2005-04-04 2008-12-16 United Technologies Corporation Heat transfer enhancement features for a tubular wall combustion chamber
US20060219191A1 (en) * 2005-04-04 2006-10-05 United Technologies Corporation Heat transfer enhancement features for a tubular wall combustion chamber
WO2006111315A1 (en) * 2005-04-18 2006-10-26 Unical Ag S.P.A. Protected carbon steel pipe for fire tube heat exchange devices, particularly boilers
EA011432B1 (en) * 2005-04-18 2009-02-27 Уникал Аг С.П.А. Protected carbon steel pipe for fire tube heat exchange device, particularly boilers
US20070089868A1 (en) * 2005-10-25 2007-04-26 Hitachi Cable, Ltd. Heat transfer pipe with grooved inner surface
US8091615B2 (en) * 2005-10-25 2012-01-10 Hitachi Cable, Ltd. Heat transfer pipe with grooved inner surface
US20070224565A1 (en) * 2006-03-10 2007-09-27 Briselden Thomas D Heat exchanging insert and method for fabricating same
US8162040B2 (en) 2006-03-10 2012-04-24 Spinworks, LLC Heat exchanging insert and method for fabricating same
US20070259156A1 (en) * 2006-05-03 2007-11-08 Lucent Technologies, Inc. Hydrophobic surfaces and fabrication process
US20120048525A1 (en) * 2008-07-22 2012-03-01 Tai-Her Yang Conducting type inter-piping fluid thermal energy transfer device
US20120285190A1 (en) * 2010-01-13 2012-11-15 Mitsubishi Electirc Corporation Heat transfer pipe for heat exchanger, heat exchanger, refrigeration cycle apparatus, and air-conditioning apparatus
EP2814910A4 (en) * 2012-02-17 2015-11-11 Ceramatec Inc Advanced fischer tropsch system
USD841142S1 (en) 2016-09-15 2019-02-19 Ngk Insulators, Ltd. Catalyst carrier for exhaust gas purification
USD837357S1 (en) * 2016-09-15 2019-01-01 Ngk Insulators, Ltd. Catalyst carrier for exhaust gas purification
USD837356S1 (en) * 2016-09-15 2019-01-01 Ngk Insulators, Ltd. Catalyst carrier for exhaust gas purification
USD841145S1 (en) * 2016-09-15 2019-02-19 Ngk Insulators, Ltd. Catalyst carrier for exhaust gas purification

Also Published As

Publication number Publication date
DE1452244A1 (en) 1971-07-22
SE310479B (en) 1969-05-05
GB1058409A (en) 1967-02-08
FR1425924A (en) 1966-01-24

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