EP1375019B1 - Thick-walled small diameter pipe producing method - Google Patents

Thick-walled small diameter pipe producing method Download PDF

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Publication number
EP1375019B1
EP1375019B1 EP02705123A EP02705123A EP1375019B1 EP 1375019 B1 EP1375019 B1 EP 1375019B1 EP 02705123 A EP02705123 A EP 02705123A EP 02705123 A EP02705123 A EP 02705123A EP 1375019 B1 EP1375019 B1 EP 1375019B1
Authority
EP
European Patent Office
Prior art keywords
tube
small diameter
final
drawing process
cutting
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
EP02705123A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1375019A4 (en
EP1375019A1 (en
Inventor
Shigetsugu c/o Sanoh Industrial Co. Ltd KAMEDA
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.)
Sanoh Industrial Co Ltd
Original Assignee
Sanoh Industrial Co Ltd
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Filing date
Publication date
Application filed by Sanoh Industrial Co Ltd filed Critical Sanoh Industrial Co Ltd
Publication of EP1375019A1 publication Critical patent/EP1375019A1/en
Publication of EP1375019A4 publication Critical patent/EP1375019A4/en
Application granted granted Critical
Publication of EP1375019B1 publication Critical patent/EP1375019B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • 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
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal 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
    • B21C1/22—Metal 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
    • B21C1/24—Metal 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 by means of mandrels
    • B21C1/26—Push-bench drawing
    • 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
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal 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
    • B21C1/22—Metal 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
    • B21C1/24—Metal 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 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 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
    • 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
    • B21C37/30—Finishing tubes, e.g. sizing, burnishing

Definitions

  • the present invention relates to a method for manufacturing a thick wall small diameter tube, and more particularly to a method for manufacturing a thick wall small diameter tube capable of being used suitably as a fuel injection tube for a diesel engine, in an efficient manner.
  • a thick wall small diameter tube used as a fuel injection tube for a diesel engine is required to have a high degree of smoothness on the inner circumferential surface of the tube, in order to reduce the flow resistance in the tube and to prevent blocking of the injection nozzle. Furthermore, it is also required that defects, and in particular, fine cracks, in the inner circumferential surface of the tube, are reduced, in such a manner that the tube is able to withstand the repeated fatigue of high pressure.
  • the thick wall small diameter tube used in this application is normally based on a seamless stock tube formed by hot rolling, such as Mannesmann mill piercing, rolling in a mandrel mill, and the like.
  • This seamless stock tube is then set to a prescribed diameter by a cold drawing process involving repetition of a tube drawing process using a draw bench, or the like, and a heat treatment process.
  • the tube member adapted to the desired diameter is then cut to a product dimension, thereby completing manufacture of a thick wall small diameter tube for use as a fuel injection tube in a diesel engine.
  • a black skin layer containing cracks, and indent-shaped wrinkles caused by the Mannesmann mill piercing process, the mandrel mill rolling, or the like, involved in the hot rolling process form on the inner and outer surfaces of the seamless stock tube.
  • fine cracks caused by the repeated tube drawing processes using a draw bench, or the like, followed by heat treatment processing also form on the inner and outer surfaces of the tube member that has been adjusted to the desired diameter.
  • Japanese Patent Publication No. S51-21391 discloses a method wherein the black skin layer on the inner circumferential surface of a seamless stock tube is removed by mechanical cutting, before the seamless stock tube formed by hot rolling is drawn into a thick wall small diameter tube forming product.
  • Japanese Patent Laid-open No. H5-154536 discloses a method wherein defects, such as fine cracks, and the like, which are present in the inner circumferential surface of the tube to be processed, are removed by mechanical cutting or grinding before the final tube drawing process, or a tube drawing process proximate thereto.
  • Japanese Patent Laid-open No. H9-57329 discloses a method wherein the inner circumferential surface of a seamless stock tube obtained by hot rolling is ground by a shot blasting process, either before the tube drawing process, or at an intermediate stage of a plurality of tube drawing processes.
  • the process of cutting, grinding, or the like, of the inner circumferential surface of the tube described above is effective in manufacturing a thick wall small diameter tube having an inner surface that is smooth and free of defects, and in particular, cutting or grinding carried out at a stage as proximate as possible to the final stage of processing is very effective, since there is only slight generation of cracks, and the like, in the subsequent processing.
  • the present invention was devised with the foregoing problems of the prior art in view, an object thereof being to provide a method whereby a thick wall small diameter tube, having an inner circumferential surface that is smooth and free of defects, which can be used suitably as a fuel injection tube for a diesel engine, can be manufactured in an efficient manner.
  • the present invention is such that, in manufacturing a thick wall small diameter tube by performing a plurality of tube drawing processes on a seamless stock tube, prior to a final tube drawing process, the tube being processed is cut to a length whereby it will assume the product dimension by means of the final tube drawing process, and a cutting or grinding process is performed on the inner circumferential surface of the cut tube.
  • the cutting or grinding process of the inner circumferential surface is performed at a stage where only the final tube drawing process remains, it is possible to provide a thick wall small diameter tube having an inner circumferential surface that is smooth and free of defects. Moreover, since the cutting or grinding process is carried out on a cut piece which has been cut to a length whereby it will assume the product dimension by means of the final tube drawing process, the length of the piece is short and the cutting or grinding process can be performed readily, in a highly accurate manner.
  • this final tube drawing process can be carried out readily by means of a forging process using a pressing force created by a press, or a forging process using a parts former employed in the formation of various parts, such as bolts, nuts, or the like, for example, this process being carried out in a short period of time in comparison with a tube drawing process using a draw bench, as in the prior art, and furthermore, there being no need for chucking in order to perform drawing, thus allowing the product yield rate to be improved.
  • Fig. 1 is a diagram showing a conceptual view of a method for manufacturing a thick wall small diameter tube relating to the present invention.
  • Fig. 2 is a diagram showing a conceptual view of one example of a final tube drawing process.
  • seamless carbon steel stock tube (JIS G 3455) having an external diameter of 34 mm and a wall thickness of 4.5 mm, formed by hot rolling involving Mannesmann mill piercing, rolling in a mandrel mill, or the like, is taken and is subjected to cold drawing consisting of repetitions of tube drawing work using a draw bench and a heat treatment process, as implemented in the prior art, thereby obtaining a tube member having an external diameter of 11 mm and a wall thickness of 2.0 mm (Fig. 1(a)).
  • the steps of cutting or grinding the inner circumferential surface of the tube as performed in the prior art are carried out during this process, since they are easy to carry out when the diameter of the tube is still relatively large, but these are not essential steps in the present invention.
  • the aforementioned tube member of 11 mm external diameter and 2.0 mm wall thickness is cut to a length of 150 mm by a cutting machine (see Fig. 1(b)).
  • the length to which the tube member is cut is such that the tube will assume a product length after subsequent tube drawing processing.
  • the object of the cutting or grinding according to the present invention is a short piece having a length of approximately 150 mm, as described above, and therefore these steps can be performed readily and in a highly accurate manner.
  • the inner circumferential surface is such that the black skin layer formed during hot rolling has been removed completely from same, and furthermore, that defects (having a size of 50 ⁇ m or above) such as indent-shaped wrinkles arising during the tube drawing work, or fine cracks, or the like, formed on the basis of these indent-shaped wrinkles, have been removed completely.
  • the cut piece which has undergone cutting or grinding on the inner surface thereof as described above is then subjected to a final tube drawing process in such a manner that the product dimensions of 8 mm external diameter, 2.0 mm wall thickness and 230 mm length are obtained (see Fig. 1(d)).
  • this final tube drawing process is performed on a short tube of approximately 150 mm length, it is possible to carry out drawing and forming using a parts former, which is used in the formation of various types of parts, such as bolts, nuts, and the like.
  • the tube to be processed A is inserted into a dice 1 having a pierce hole of restricted diameter, by means of press equipment using water pressure, hydraulic oil pressure or a clamp mechanism, and the tube to be processed A is drawn by means of a forging process.
  • Element 3 in Fig. 2 is a plug which is inserted inside the tube to be processed A.
  • This final tube drawing process is carried out in a short period of time in comparison with conventional tube drawing processes using a draw bench, and moreover, it requires no chucking for the purpose of drawing, and hence the product yield rate can be improved.
  • the thick wall small diameter tube manufactured in this manner may contain slight cracks (of maximum size 10 ⁇ m) generated by the final tube drawing process, but it is a thick wall small diameter tube having an inner circumferential surface which is sufficiently smooth and free of defects, and it can be used appropriately as a fuel injection tube for a diesel engine.
  • the method for manufacturing a thick wall small diameter tube according to the present invention is also applicable to thick wall small diameter tubes used in applications other than fuel injection tubes for a diesel engine, and may be employed appropriately for the manufacture of any thick wall small diameter tube having strict requirements with regard to the properties of the inner circumferential surface thereof.
  • the method of the present invention may also be applied to the manufacture of thick wall small diameter tube of any type of steel, such as carbon steel, alloy steel, stainless steel, and the like.
  • the final tube drawing process may be implemented by dividing it over a plurality of tube drawing steps.
  • a thick wall small diameter tube relating to the present invention as described above, since a cutting or grinding process on the inner circumferential surface is carried out at a stage where only the final tube drawing process remains, it is possible to provide a thick wall small diameter tube having an inner circumference that is smooth and free of defects, in addition to which, since the cutting or grinding process is carried out on a cut piece that has been cut to a length whereby it will assume the product dimension by means of the final tube drawing process, then a merit is obtained in that, since the length of the piece is short, the cutting or grinding process can readily be carried out with good accuracy.
  • the tube to be processed is cut to a length whereby it will assume the product dimension by means of the final tube drawing process, before the final tube drawing process, it is possible to carry out the final tube drawing process readily by means of a forging process using a pressing force created by a press, or by means of a forging process using a parts former employed to form various parts, such as bolts, nuts, or the like, for example, and this process can be carried out in a short period of time in comparison with a tube drawing process using a draw bench, as in the prior art, in addition to which, chucking for the purpose of drawing is not required and hence a merit is obtained in that the product yield rate can also be improved.
  • the method for manufacturing a thick wall small diameter tube relating to the present invention is applicable to cases where thick wall small diameter tubes having strict requirements with respect to the properties of their inner surface, such as fuel injection tubes for a diesel engine, are manufactured in an efficient manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
  • Fuel-Injection Apparatus (AREA)
EP02705123A 2001-03-21 2002-03-13 Thick-walled small diameter pipe producing method Expired - Lifetime EP1375019B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2001080073A JP3920581B2 (ja) 2001-03-21 2001-03-21 厚肉細径管の製造方法
JP2001080073 2001-03-21
PCT/JP2002/002349 WO2002074462A1 (fr) 2001-03-21 2002-03-13 Procede de fabrication de tuyau de faible diametre a paroi epaisse

Publications (3)

Publication Number Publication Date
EP1375019A1 EP1375019A1 (en) 2004-01-02
EP1375019A4 EP1375019A4 (en) 2004-06-02
EP1375019B1 true EP1375019B1 (en) 2005-12-14

Family

ID=18936422

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02705123A Expired - Lifetime EP1375019B1 (en) 2001-03-21 2002-03-13 Thick-walled small diameter pipe producing method

Country Status (4)

Country Link
EP (1) EP1375019B1 (ja)
JP (1) JP3920581B2 (ja)
DE (1) DE60208011T2 (ja)
WO (1) WO2002074462A1 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100468229B1 (ko) * 2002-01-16 2005-01-26 박종환 단조가공에 의해 다양한 종류의 밸브를 제조하는 장치
CN114669623B (zh) * 2022-03-03 2024-09-27 合肥聚能电物理高技术开发有限公司 一种椭圆截面薄壁无磁不锈钢真空管道的成型方法
DE102022114337A1 (de) * 2022-06-08 2023-12-14 Mannesmann Precision Tubes Gmbh Verfahren zur Herstellung eines nahtlosen Präzisionsstahlrohrs, derartiges Präzisionsstahlrohr und entsprechende Herstellungsanlage

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3085762B2 (ja) * 1991-12-02 2000-09-11 臼井国際産業株式会社 厚肉細径管の製造方法
JP3152360B2 (ja) * 1991-12-04 2001-04-03 臼井国際産業株式会社 厚肉細径管内周面切削装置
JPH09122795A (ja) * 1995-11-06 1997-05-13 Daido Steel Co Ltd 鋼の中空体を製造する方法

Also Published As

Publication number Publication date
JP2002273512A (ja) 2002-09-25
EP1375019A4 (en) 2004-06-02
EP1375019A1 (en) 2004-01-02
WO2002074462A1 (fr) 2002-09-26
DE60208011T2 (de) 2006-07-13
JP3920581B2 (ja) 2007-05-30
DE60208011D1 (de) 2006-01-19

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