US3155229A - Drawing mandrel - Google Patents

Drawing mandrel Download PDF

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Publication number
US3155229A
US3155229A US199714A US19971462A US3155229A US 3155229 A US3155229 A US 3155229A US 199714 A US199714 A US 199714A US 19971462 A US19971462 A US 19971462A US 3155229 A US3155229 A US 3155229A
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US
United States
Prior art keywords
mandrel
pipe
hard metal
pull rod
guiding
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
US199714A
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English (en)
Inventor
Lacksinger Rudolf Bruno Josef
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.)
Outokumpu Stainless AB
Original Assignee
Avesta Jernverks AB
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
Application filed by Avesta Jernverks AB filed Critical Avesta Jernverks AB
Application granted granted Critical
Publication of US3155229A publication Critical patent/US3155229A/en
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Expired - Lifetime legal-status Critical Current

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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
    • B21C1/00—Manufacture of metal sheets, wire, rods, tubes or like semi-manufactured products by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes
    • B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes specially adapted for making tubular articles
    • B21C1/24—Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes specially adapted for making tubular articles by means of mandrels
    • 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
    • B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels for metal drawing
    • B21C3/02—Dies; Selection of material therefor; Cleaning thereof
    • B21C3/12—Die holders; Rotating dies
    • B21C3/14—Die holders combined with devices for guiding the drawing material or combined with devices for cooling, heating, or lubricating
    • 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
    • B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels for metal drawing
    • B21C3/16—Mandrels; Mounting or adjusting same
    • 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
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles 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
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0807—Tube treating or manipulating combined with, or specially adapted for use in connection with tube making machines, e.g. drawing-off devices, cutting-off
    • B21C37/0811—Tube treating or manipulating combined with, or specially adapted for use in connection with tube making machines, e.g. drawing-off devices, cutting-off removing or treating the weld bead

Definitions

  • the present invention relates to a drawing mandrel of the kind used for cold reduction of metal pipe in a drawing bench. Such mandrels are subject to extraordinarily high abrasion which necessitates their replacement after a relatively short period of useful service, which involves trouble and cost.
  • the abovementioned drawback of drawing mandrels made of hard metal has been obviated by the feature of providing the hard metal mandrel with an extension made of a steel which is resistant to impact stresses and which extension, when, upon completion of the drawing operation, the hard-metal mandrel is suddenly pulled out through the end opening of the pipe, will remain within the pipe in guiding engagement with the Walls of the latter and will not until after that moment slowly pass out of the pipe, and to let the pipe, after the drawing die, pass through a guiding member which supports the pipe as the end of the latter is suddenly pulled oil the drawing mandrel, the pipe after a while leaving this guiding member at the slow drawing speed.
  • the guid ing extension of the hard metal mandrel is designed in the form of an elongated supporting nut which is screwed onto the screw-threaded end portion of the pull rod and with which the hard metal mandrel, which is formed with a bore for passing the pull rod, is connected by a soldered joint.
  • the drawing mandrel should be of such design and should be maintained, during the drawing operation, in such a position relative to the drawing die,
  • soldered joint will be situated externally of the zone within which the deformation of the pipe wall is being effected.
  • mandrel ring of hard metal may be pushed with a force fit onto the pull rod, thereby affording further security against any relative displacement of the hard metal ring relative to the supporting nut.
  • a reinforcement of the soldered joint may be obtained by making the same conical in shape, for example.
  • the guiding extension need not necessarily fit snugly within the pipe, but a certain, relatively large clearance may be allowed. As a rule, however, it will be preferable to dimension the guiding extension to slidingly engage the pipe wall peripherally with its extreme end portion. Such a safe guiding action can be obtained by making the 3,l55,229 Patented Nov. 3, 1964 end portion of the guiding extension resiliently expansible. It would also be conceivable to form a die serving for guiding the pipe as a further pipe-diameter reducing drawing die adapted to force the pipe into engagement with the end portion of the guiding extension, this end portion being then formed as a second drawing mandrel.
  • FIG. 1 illustrates a first embodiment
  • FIG. 2 a second embodiment of a drawing mandral constructed in accordance with the invention.
  • FIG. 3 shows a modified form of soldered joint between the hard metal drawing mandrel and the supporting nut for the latter.
  • the drawing mandrel proper comprises a cylindrical ring 10 of hard metal which is passed with a snug or force fit over a cylindrical portion 11 of the pull rod 12 close to the screw-threaded end portionof the latter.
  • the hard metal mandrel 10 is supported against an elongated nut 15 of hardened steel into which the pull rod is screwed.
  • the hard metal mandrel 10 is rigidly connected to the nut 13 by a soldered joint 14.
  • the nut is formed at its free end with a ball-shaped enenlargement 15 of a diameter slightly less than that of the hard metal mandrel 19.
  • the pipe 16 to be cold-reduced is drawn in the conventional manner over the mandrel 19 and through a drawing die 17 where a reduction of the pipe diameter and, possibly, also of the wall thickness is effected.
  • the mandrel 10 is held by the pull rod 12 in the position shown relative to the drawing die 17, in which position the soldered joint 14 is situated ahead of the zone within which the pipe-wall material is being deformed, whereby the soldered joint will remain relieved of shearing stresses tending to destroy the soldered connection.
  • a second drawing die 18 Positioned opposite the ball-shaped end 15 of the supporting nut in the operating position of the mandrel is a second drawing die 18 which is maintained in properly spaced relation to the first drawing die 17 by a spacer ring 19.
  • the second drawing die 18 serves exclusively as a guiding member for the pipe 16 and, therefore, has an opening diameter which is equal to, or slightly larger than that of the first drawing die 17 serving to reduce the pipe diameter, whereby the pipe will pass through the second drawing die with unnoticeable friction.
  • the diameter of the ball 15 is slightly less than that of the mandrel 10 so that the ball will slide through the pipe with a certain clearance relative thereto.
  • FIG. 2 One conceivable embodiment is illustrated in FIG. 2.
  • the end of the supporting nut 13 is designed to serve as a second cylindrical drawing mandrel 20. Due to the fact that this second drawing mandrel 20 is made of a material of less abrasion strength than that of the first drawing mandrel 10, it should be ascertained that the second or trailing mandrel will not be subjected to higher Wear than that corresponding to a useful service life approximately equal to that of the leading drawing mandrel 10. It should be suitable, therefore, to keep the pipe reduction effected by the second drawing die 18 within much closer limits than that effected by the first drawing die 17.
  • FIG. 3 illustrates an alternative method of securing the hard-metal mandrel 10 to the supporting nut 13.
  • the punch ring is formed with a conical inner end face engaging a correspondingly concave-conical end face of the supporting nut 13, whereby the soldered joint 21 will have an enlarged connection interface, and will, in addition, no longer be exactly perpendicular to the drawing direction.
  • a soldered joint designed in accordance with FIG. 3, or in other similar wa will be more resistant to transversely directed forces than a soldered joint according to FIGS. 1 and 2.
  • An apparatus for the cold reduction of the diameter of metal tube in a drawing bench which comprises in combination:
  • said trailing guide extension being made of a steel which is less resistant to abrasive forces but more.
  • said trailing guide extension is in the form of a second mandrel being dimensioned to etiec't a further reduction in the diameter of said tube.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
US199714A 1961-06-30 1962-06-04 Drawing mandrel Expired - Lifetime US3155229A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE683861 1961-06-30

Publications (1)

Publication Number Publication Date
US3155229A true US3155229A (en) 1964-11-03

Family

ID=20269723

Family Applications (1)

Application Number Title Priority Date Filing Date
US199714A Expired - Lifetime US3155229A (en) 1961-06-30 1962-06-04 Drawing mandrel

Country Status (4)

Country Link
US (1) US3155229A (de)
AT (1) AT241398B (de)
CH (1) CH394997A (de)
GB (1) GB1006973A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3292407A (en) * 1964-06-18 1966-12-20 Bruce B Krost Tube drawing apparatus
US3487673A (en) * 1967-03-06 1970-01-06 Calumet & Hecla Corp Form drawing of fluted tubing
EP2241386A1 (de) * 2009-04-16 2010-10-20 Felss GmbH Umformwerkzeug zur Herstellung eines Innenprofils, insbesondere einer Innenverzahnung, eines Werkstücks
US20140295206A1 (en) * 2011-08-19 2014-10-02 Showa Denko K.K. Substrate for photosensitive drum
CN111215462A (zh) * 2020-03-02 2020-06-02 张家港保税区亚信汽车零部件科技有限公司 一种旋转冷拔芯棒座
CN113825574A (zh) * 2019-05-14 2021-12-21 菲尔斯系统有限责任公司 用于在工件壁上加工工件的加工单元和加工机以及用于制造所述类型的加工单元的方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111922105A (zh) * 2020-06-01 2020-11-13 广东和胜工业铝材股份有限公司 管材拉拔模具及拉拔工艺

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1166040A (en) * 1915-03-28 1915-12-28 William Burlingham Apparatus for lining tubes.
DE522161C (de) * 1928-06-13 1931-04-01 Max Bittersmann Einrichtung zum Kaltziehen von Metallrohren
US1928227A (en) * 1931-08-06 1933-09-26 Allegheny Steel Co Double reduction one-pass
DE936084C (de) * 1953-04-16 1955-12-07 Kronprinz Ag Einrichtung zum Herstellen von Rohren aus laengsnahtgeschweissten, einem Ziehvorgangzu unterwerfenden Ausgangsrohren mit einer Vorrichtung zum Entfernen des Schweissgrates

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1166040A (en) * 1915-03-28 1915-12-28 William Burlingham Apparatus for lining tubes.
DE522161C (de) * 1928-06-13 1931-04-01 Max Bittersmann Einrichtung zum Kaltziehen von Metallrohren
US1928227A (en) * 1931-08-06 1933-09-26 Allegheny Steel Co Double reduction one-pass
DE936084C (de) * 1953-04-16 1955-12-07 Kronprinz Ag Einrichtung zum Herstellen von Rohren aus laengsnahtgeschweissten, einem Ziehvorgangzu unterwerfenden Ausgangsrohren mit einer Vorrichtung zum Entfernen des Schweissgrates

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3292407A (en) * 1964-06-18 1966-12-20 Bruce B Krost Tube drawing apparatus
US3487673A (en) * 1967-03-06 1970-01-06 Calumet & Hecla Corp Form drawing of fluted tubing
EP2241386A1 (de) * 2009-04-16 2010-10-20 Felss GmbH Umformwerkzeug zur Herstellung eines Innenprofils, insbesondere einer Innenverzahnung, eines Werkstücks
US20140295206A1 (en) * 2011-08-19 2014-10-02 Showa Denko K.K. Substrate for photosensitive drum
CN113825574A (zh) * 2019-05-14 2021-12-21 菲尔斯系统有限责任公司 用于在工件壁上加工工件的加工单元和加工机以及用于制造所述类型的加工单元的方法
CN113825574B (zh) * 2019-05-14 2024-01-09 菲尔斯系统有限责任公司 用于在工件壁上加工工件的加工单元和加工机以及用于制造所述类型的加工单元的方法
US12214413B2 (en) 2019-05-14 2025-02-04 Felss Systems Gmbh Processing unit and processing machine for processing a workpiece wall of a workpiece, and method for producing such a processing unit
CN111215462A (zh) * 2020-03-02 2020-06-02 张家港保税区亚信汽车零部件科技有限公司 一种旋转冷拔芯棒座

Also Published As

Publication number Publication date
GB1006973A (en) 1965-10-06
AT241398B (de) 1965-07-26
CH394997A (de) 1965-07-15

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