US3292414A - Apparatus for localized swaging of pipes - Google Patents

Apparatus for localized swaging of pipes Download PDF

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Publication number
US3292414A
US3292414A US405545A US40554564A US3292414A US 3292414 A US3292414 A US 3292414A US 405545 A US405545 A US 405545A US 40554564 A US40554564 A US 40554564A US 3292414 A US3292414 A US 3292414A
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US
United States
Prior art keywords
blank
swaging
bore
die
conical bore
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
US405545A
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English (en)
Inventor
Goeke Alfons
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.)
TH Kieserling and Albrecht GmbH and Co
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TH Kieserling and Albrecht GmbH and Co
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Filing date
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Application filed by TH Kieserling and Albrecht GmbH and Co filed Critical TH Kieserling and Albrecht GmbH and Co
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Publication of US3292414A publication Critical patent/US3292414A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C5/00—Pointing; Push-pointing
    • B21C5/003—Pointing; Push-pointing of hollow material, e.g. tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C5/00—Pointing; Push-pointing
    • 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
    • Y10T29/49391—Tube making or reforming

Definitions

  • the present invention relates to a method and apparatus for localized swaging, also known as setting down, of pipes. More particularly, the invention relates to a method and apparatus for providing comparatively thinwalled tubular blanks with swaged-down end portions to facilitate engagement of such end portions by draw-bench tongs or similar gripping devices when the blanks are subjected to one or more drawing operations.
  • the end portion may be readily introduced into and engaged by the gripping mechanism of a draw bench, and by providing at least one passage for fluid the swaged-down end portion will allow for evacuation of pickling liquid, tallow and other types of fluids which are used between consecutive drawing steps.
  • the end portions of thin-walled tubular blanks are often provided with corrugations which are separated by gaps so that the liquid is free to flow into and from the pipe.
  • corrugated end portions cannot withstand very high gripping stresses and are not satisfactory for repeated drawing.
  • the end portion of a thin-walled tubular blank is swaged down to be provided with a pair of bent-over portions, and the thus treated end portion is thereupon squeezed to form a body consisting of adjacent layers which completely seal the respective end.
  • such blank is hard-to-handle because any liquid which has been admitted into its interior cannot escape through the end portion.
  • Another object of the invention is to provide a method of the just outlined characteristics which may be used with particular advantage in connection with thin-walled tubular blanks which must undergo one but normally at least two or more drawing operations.
  • the wall thickness is a small fraction of the diameter.
  • a further object of the invention is to provide a method of setting down end portions of tubular blanks which consist of ductile material and which must be subjected to repeated action of redrawing dies because the depth of the desired draw is so great that the material may fracture if the shape change to ultimate wall thickness is attempted in a single draw.
  • An additional object of the invention is to provide a novel apparatus for the pracitce of my method and to construct the apparatus in such a way that the blanks may be provided with swaged-down end portions with little loss in time and with a high degree of uniformity.
  • Still another object of the invention is to provide an improved swaging die which may be used in the apparatus of the just outlined character.
  • Another object of the invention is to provide a swaging die which may be put to use in many types of presently known machine tools whereby such machine tools require minimal alterations to accommodate the die.
  • a concomitant object of the invention is to provide improved swaged-down end portions on seamless metallic pipes and similar tubular blanks so that such blanks may withstand very high tensional and other stresses when they undergo repeated drawing in a draw bench or a similar machine tool.
  • FIG. 1 is a side elevationalview of a tubular blank in the form of a seamless metallic pipe of ductile material one end portion of which has undergone partial deformation such as is necessary to set it down gradually to a desired diameter;
  • FIG. 1a is an end view of the structure shown in FIG. 1, looking downwardly;
  • FIG. 2 is another side elevational view of the blank and illustrates the next stage in the formation of a swageddown end portion
  • FIG. 2a is an end view of the structure shown in FIG. 2, looking downwardly;
  • FIG. 3 is a side elevational view of the blank as it appears subsequent to completion of the swaging operation
  • FIG. 3a is an end view of the blank, looking downwardly in FIG. 3;
  • FIG. 4 is an enlarged axial section through a swaging die which may be used to provide the blank of FIGS. 1 to 3a with a swaged-down end portion, the section being taken in the direction of arrows as seen from the line A-B in FIG. 5;
  • FIG. 4a is a transverse section as seen in the direction of arrows from the line CD of FIG. 4;
  • FIG. is a front elevational view of a swaging apparatus which utilizes the swaging die of FIGS. 4 and 4a.
  • one feature of the present invention resides in the provision of a method of setting down the ends of ductile tubular blanks preparatory to a drawing operation.
  • the method comprises the steps of deforming at least three but preferably four or even more angularly spaced equidistant sections or zones at one end of the blank inwardly to provide axially extending corrugations whose depth decreases in a direction away from the corresponding end of the blank whereby the thus deformed length resembles the frusturn of a first hollow cone, and thereupon compressing the outer portion of the thus deformed length of the blank to immediately transform such outer portion into a substantially cylindrical body of constant cross section wherein the corrugations are flattened out or collapsed to form substantially radially extending equidistant twin-walled partitions defining between themselves a series of passages through which a fluid may flow into and from the interior of the blank.
  • the remainder of the deformed length of the blank forms the frustum of a second hollow cone whose corrugations constitute extensions of twin-walled partitions on the outer portion.
  • the innermost portions of the partitions may be and are preferably moved into actual abutment with each other along the axis of the outer portion whereby the partitions resist crushing of the outer portion in response to clamping forces transmitted by gripping instrumentalities which are used to connect the blank to the moving carriage of a draw bench when the blank is subjected to one or more drawing operations.
  • the corrugations may be formed by passing the blank through a composite annular swaging die which comprises inwardly extending projections. Once the blank is provided with such corrugations, the outer portion of the thus deformed length is forced into a second annular die or into an annular portion of the composite swaging die which causes the material of the outer portion to move inwardly whereby the corrugations are flattened and form the aforementioned partitions.
  • a composite annular swaging die 4 which comprises four arcuate segments in, 1b, 1c, 1d. These segments are assembled to form an annulus having a first portion which defines a conical bore 2 and a coaxial second portion which defines a cylindrical bore 3.
  • the diameter of the conical bore 2 diminishes in a direction toward the cylindrical bore 3, and the latter communicates with the smaller-diameter end of the conical bore.
  • the internal surface of the first portion whichforms the conical bore 2 is provided with four equidistant axially extending projections.
  • Each such projection comprises a first semiconical portion whose tip is adjacent to the larger-diameter end of the bore 2 and a second semiconical portion 4b whose tip is adjacent to the inlet end of the bore 3.
  • the semiconical portions 41) may be dispensed with because the semiconical portions 4a will suflice to form the end portion of a tubular blank 6 with four equidistant corrugations 6a (see FIGS. 1-3a) by bending angularly spaced sections or zones of a blank radially inwardly. It is normally advisable to form the projections in the form of twin semiconical bodies 4a, 4b because such projections can be machined more readily than projections which merely comprise a single semiconical portion 4a.
  • FIG. 5 illustrates a swaging apparatus which utilizes the annular die 4 of FIGS. 4 and 4a.
  • This apparatus comprises four radially reciprocable tool holders 9 each of which grips one of the segments la-ld.
  • the tool holders 9 may support other types of tools to carry out a swaging operation upon a piece of solid rod stock.
  • the apparatus of FIG. 5 is useful to carry out a conventional swaging operation and also to provide thin-walled tubular blanks With swaged-down end portions.
  • the mechanism including the parts for reciprocating the segments la-ld toward and away from the axes of the bores 2, 3 is well known in the art and forms no part of the present invention.
  • the numeral 5 indicates the housing for the tool holders 9.
  • the apparatus of FIG. 5 operates as follows:
  • the leading end 6b of the tubular blank 6 shown in FIG. 1 is introduced into the conical bore 2, either by hand or by an automatic feeding mechanism not shown in the drawings.
  • a portion at the leading end 6b of the blank 6 is provided with angularly spaced axially extending corrugations 6a whose depth decreases in a direction away from the end 65.
  • the end face of the blank 6 then resembles a cross with the walls of the corrugations 6a forming substantially V-shaped troughs.
  • the corrugated length of the blank 6 forms the frustum of a hollow cone whose diameter diminishes in a direction away from the leading end 6b.
  • the blank 6 continues to penetrate into the annulus of segments 1a1d whereby the outer portion 8 of the frustum enters the cylindrical bore 3 and is compressed radially to form a cylindrical body of constant cross section which is ready to be gripped by the tongs on the carriage of a draw bench.
  • the remainder 7 of the deformed length of the blank 6 forms a second conical frustum Whose axial length is determined by the axial length of the bore 2.
  • the corrugations 6a are compressed to form twin-walled partitions defining between themselves four passages 6d which allow a liquid medium to flow into and from the interior of the blank 6.
  • the outer portion 8 is capable of withstanding very high compressive and tensional stresses which arise when the blank 6 is subsequently treated in a draw bench to form a thin-walled pipe.
  • the innermost portions 60 of the twin-walled partitions will move in abut! ment with each other to ofiFer very high resistance to compression (crushing) of the outer portion 8.
  • the innermost portions 6c of the partitions may move into actual abutment at the time the outer portion 8 is driven into the bore 3.
  • the axis of the outer portion 8 coincides with the axis of the undeformed part of the blank 6, and its diameter is shown as approximating one-half of the diameter of the blank.
  • the blank may be formed with three, five or more twin-walled partitions, and each segment may consist of two portions whereby one portion of'each segment cooperates with the corresponding portions of the other segments to form the conical bore 2, and the other portion of each segment cooperates with the corresponding portions of the other segments to form the cylindrical bore 3.
  • the projections 4a, 4b may be replaced by teeth which are adjustable radially of the annulus 4.
  • the diameter of the bore 3 preferably equals or approximates the diameter of the thin-walled pipe which is obtained when the blank 6 Because the undergoes one or more drawing operations.
  • outer portion of the swaged-down length of the blank 6 is shaped as a true cylinder, this outer portion may be introduced into the gripping mechanism of a draw bench with the help of automatic transfer devices. Also, such cylindrical outer portion can withstand very high compressive or crushing stresses and enables the blank to undergo a series of drawing operations without the formation of fissures.
  • a die for setting down the ends of ductile tubular blanks preparatory to a drawing operation, said die comprising at least three arcuate segments movable radially with reference to each other and together forming an annulus including a first portion defining a conical bore having a larger-diameter end and a smaller-diameter end, and a second portion defining a cylindrical bore coaxial to and communicating with the smaller-diameter end of said conical bore, and at least one axially extending projection provided on each of said segments and extending substantially radially inwardly into said conical bore; and means for reciprocating said segments radially toward and away from each other to corrugate the leading end of a tubular blank which is introduced into and through the larger-diameter end of said conical bore, the outer portion of the thus deformed length of the blank being thereupon compressed radially inwardly to form a substantially cylindrical body on introduction into said cylindrical bore.
  • each of said projections are equidistant from each other and wherein each of said projections comprises a semiconical portion extending axially of said first portion and having a tip adjacent to the larger-diameter end of said conical bore.
  • a die for setting down the ends of ductile tubular blanks preparatory to a drawing operation comprising at least three die members movable radially with reference to each other and each having a first portion carrying at least one axially extending projection protruding radially inwardly along a frustoconical surface having a larger-diameter end and a smaller-diameter end, and a second portion, said second portions defining a cylindrical bore coaxial to and communicating with the smaller-diameter end of said frustoconical surface; and means for reciprocating said die members radially toward and away from each other to corrugate the leading end of a tubular blank which is introduced through said larger-diameter end of said frustoconical surface between said axially extending radially inwardly protruding projections, the outer portion of the thus deformed length of the blank being thereupon compressed radially inwardly by said second portions of said

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
US405545A 1963-11-21 1964-10-21 Apparatus for localized swaging of pipes Expired - Lifetime US3292414A (en)

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Application Number Priority Date Filing Date Title
DEK0051420 1963-11-21

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Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3436949A (en) * 1965-04-27 1969-04-08 George A Mitchell Co Tube pointing apparatus
US3695087A (en) * 1970-08-26 1972-10-03 Arthur H Tuberman Method and apparatus for pointing tubes
US4048933A (en) * 1976-04-05 1977-09-20 Dixico Inc. Container head forming
US4308744A (en) * 1980-02-08 1982-01-05 United Wire & Supply Corporation Tube pointer
US4350036A (en) * 1980-02-07 1982-09-21 Vale Industries Inc. Apparatus for pointing work pieces
US4417462A (en) * 1980-08-28 1983-11-29 Rockwell International Corporation Axle spindle and method for making the same
US4594874A (en) * 1983-07-11 1986-06-17 Veeder Industries Inc. Method of forming socket wrenches from tubing
US4625537A (en) * 1982-12-06 1986-12-02 Grumman Aerospace Corporation Localized boss thickening by cold swaging
WO1989007056A1 (en) * 1988-01-29 1989-08-10 Biomet, Inc. Variable wall thickness interlocking intramedullary nail and method for making same
US4961576A (en) * 1988-11-23 1990-10-09 Sandvik Special Metals Corporation Constant wall shaft with reinforced tip
US5074555A (en) * 1989-04-24 1991-12-24 Sandvik Special Metals Corp. Tapered wall shaft with reinforced tip
US5136872A (en) * 1990-12-05 1992-08-11 Europa Mettali-Lmi S.P.A. Process for the preparation of tubular ingot moulds intended for installations for the continuous casting of steel
US5311661A (en) * 1992-10-19 1994-05-17 Packless Metal Hose Inc. Method of pointing and corrugating heat exchange tubing
US5409057A (en) * 1993-01-22 1995-04-25 Packless Metal Hose, Inc. Heat exchange element
DE19632012A1 (de) * 1996-08-08 1998-04-09 Karsten Bock Umformpresse zum Anspitzen von Rohren
US5803128A (en) * 1994-04-28 1998-09-08 Packless Metal Hose, Inc. Braided conduit and method of making a braided conduit
US5813438A (en) * 1994-04-28 1998-09-29 Packless Metal Hose, Inc. Braided conduit and method of making a braided conduit
US6447399B1 (en) * 1998-06-05 2002-09-10 Textron Fastening Systems Limited Method of forming a tubular member
US20070290505A1 (en) * 2006-06-15 2007-12-20 Foxconn Technology Co., Ltd. Sealing structure of heat pipe and method for manufacturing the same
US20080012308A1 (en) * 2005-10-11 2008-01-17 Foxconn Technology Co., Ltd. Heat pipe and method for sealing the heat pipe
JP2020157354A (ja) * 2019-03-27 2020-10-01 住友重機械工業株式会社 金属パイプ及び金属パイプの成形方法
US11097385B2 (en) * 2016-06-29 2021-08-24 Compagnie Generale Des Etablissements Michelin Method for producing a heat pipe

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1070379A (en) * 1912-10-19 1913-08-12 Chase Rolling Mill Co Tube-pointing machine.
DE576747C (de) * 1931-06-27 1933-05-16 Richard Gottschalk Herstellung von mit gerieften oder genuteten Kegelflaechen versehenen Kuppelmuffen und Bremswiderlagern fuer Freilaufnaben
US2055771A (en) * 1933-04-18 1936-09-29 Aluminum Co Of America Method of making shafts
GB567355A (en) * 1943-09-14 1945-02-09 Wellman Seaver Rolling Mill Co Improvements in or relating to tube swaging machines
CA672439A (en) * 1963-10-15 M. Stoner Arthur Warm heading method of making chuck keys
US3154978A (en) * 1962-07-09 1964-11-03 United Wire & Supply Corp Tube pointer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA672439A (en) * 1963-10-15 M. Stoner Arthur Warm heading method of making chuck keys
US1070379A (en) * 1912-10-19 1913-08-12 Chase Rolling Mill Co Tube-pointing machine.
DE576747C (de) * 1931-06-27 1933-05-16 Richard Gottschalk Herstellung von mit gerieften oder genuteten Kegelflaechen versehenen Kuppelmuffen und Bremswiderlagern fuer Freilaufnaben
US2055771A (en) * 1933-04-18 1936-09-29 Aluminum Co Of America Method of making shafts
GB567355A (en) * 1943-09-14 1945-02-09 Wellman Seaver Rolling Mill Co Improvements in or relating to tube swaging machines
US3154978A (en) * 1962-07-09 1964-11-03 United Wire & Supply Corp Tube pointer

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3436949A (en) * 1965-04-27 1969-04-08 George A Mitchell Co Tube pointing apparatus
US3695087A (en) * 1970-08-26 1972-10-03 Arthur H Tuberman Method and apparatus for pointing tubes
US4048933A (en) * 1976-04-05 1977-09-20 Dixico Inc. Container head forming
US4350036A (en) * 1980-02-07 1982-09-21 Vale Industries Inc. Apparatus for pointing work pieces
US4308744A (en) * 1980-02-08 1982-01-05 United Wire & Supply Corporation Tube pointer
US4417462A (en) * 1980-08-28 1983-11-29 Rockwell International Corporation Axle spindle and method for making the same
US4625537A (en) * 1982-12-06 1986-12-02 Grumman Aerospace Corporation Localized boss thickening by cold swaging
US4594874A (en) * 1983-07-11 1986-06-17 Veeder Industries Inc. Method of forming socket wrenches from tubing
WO1989007056A1 (en) * 1988-01-29 1989-08-10 Biomet, Inc. Variable wall thickness interlocking intramedullary nail and method for making same
US4961576A (en) * 1988-11-23 1990-10-09 Sandvik Special Metals Corporation Constant wall shaft with reinforced tip
US5074555A (en) * 1989-04-24 1991-12-24 Sandvik Special Metals Corp. Tapered wall shaft with reinforced tip
US5136872A (en) * 1990-12-05 1992-08-11 Europa Mettali-Lmi S.P.A. Process for the preparation of tubular ingot moulds intended for installations for the continuous casting of steel
US5311661A (en) * 1992-10-19 1994-05-17 Packless Metal Hose Inc. Method of pointing and corrugating heat exchange tubing
US5409057A (en) * 1993-01-22 1995-04-25 Packless Metal Hose, Inc. Heat exchange element
US5551504A (en) * 1993-01-22 1996-09-03 Packless Metal Hose, Inc. Heat exchange element
US5803128A (en) * 1994-04-28 1998-09-08 Packless Metal Hose, Inc. Braided conduit and method of making a braided conduit
US5813438A (en) * 1994-04-28 1998-09-29 Packless Metal Hose, Inc. Braided conduit and method of making a braided conduit
US5819807A (en) * 1994-04-28 1998-10-13 Packless Metal Hose, Inc. Braided conduit and method of making a braided conduit
DE19632012A1 (de) * 1996-08-08 1998-04-09 Karsten Bock Umformpresse zum Anspitzen von Rohren
US6447399B1 (en) * 1998-06-05 2002-09-10 Textron Fastening Systems Limited Method of forming a tubular member
US20080012308A1 (en) * 2005-10-11 2008-01-17 Foxconn Technology Co., Ltd. Heat pipe and method for sealing the heat pipe
US7543380B2 (en) * 2005-10-11 2009-06-09 Foxconn Technology Co., Ltd. Heat pipe and method for sealing the heat pipe
US20070290505A1 (en) * 2006-06-15 2007-12-20 Foxconn Technology Co., Ltd. Sealing structure of heat pipe and method for manufacturing the same
US7494160B2 (en) * 2006-06-15 2009-02-24 Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. Sealing structure of heat pipe and method for manufacturing the same
US11097385B2 (en) * 2016-06-29 2021-08-24 Compagnie Generale Des Etablissements Michelin Method for producing a heat pipe
JP2020157354A (ja) * 2019-03-27 2020-10-01 住友重機械工業株式会社 金属パイプ及び金属パイプの成形方法

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Publication number Publication date
AT256007B (de) 1967-08-10

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