US20200156127A1 - Continuous tube rolling method and mandrel assembly for the implementation thereof - Google Patents

Continuous tube rolling method and mandrel assembly for the implementation thereof Download PDF

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Publication number
US20200156127A1
US20200156127A1 US16/610,739 US201716610739A US2020156127A1 US 20200156127 A1 US20200156127 A1 US 20200156127A1 US 201716610739 A US201716610739 A US 201716610739A US 2020156127 A1 US2020156127 A1 US 2020156127A1
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United States
Prior art keywords
mandrel
mandrel assembly
wear
rolling
cylindrical
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.)
Abandoned
Application number
US16/610,739
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English (en)
Inventor
Alexander Anatolyevich Klachkov
Igor Yuryevich Pyshmintsev
Alexander Vladimirovich Vydrin
Dmitriy Olegovich Struin
Pavel Yuryevich Gorozhanin
Nikolay Vladimirovich Trutnev
Vladimir Alexandrovich Toprov
Ivan Igorevich Lube
Ivgeniy Alexandrovich Shkuratov
Ivan Nikolaevich Chernykh
Alexander Nikolaevich Kuznetsov
Dmitriy Valerievich Lokhanov
VLADISLAV ANATOLYEViCH MAMCHENKO
Vladimir Leonidovich Pyatkov
Boris Griggryevich Pyankov
Igor Anatglyevich Ershov
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Pubiichnoe Aktsionernoe Obshchestvo Trubnaya Metallurgicheskaya Kompaniya
Original Assignee
Pubiichnoe Aktsionernoe Obshchestvo Trubnaya Metallurgicheskaya Kompaniya
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Publication of US20200156127A1 publication Critical patent/US20200156127A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
    • B21B25/06—Interchanging mandrels, fixing plugs on mandrel rods or cooling during interchanging mandrels

Definitions

  • the present invention relates to the industry of tube production (also known as pipe manufacturing), in particular to the production of tubes (pipes) on a continuous tube rolling mill and the design of a mandrel assembly therefor.
  • Continuous tube rolling mills with a floating long cylindrical mandrel have been known since 1885 (patent of Canada No. 24956, published on 13 Sep. 1886).
  • a floating mandrel is used, it is inserted into a tubular billet (hollow shell), and when rolling the mandrel moves with rolled material beyond the continuous mill, then the mandrel is removed from the rolled material using a chain-type mandrel extractor.
  • the mandrel is made monolithic, with a guide cone at the front end, a cylindrical part and a tail part in the form of an annular groove, for which a mandrel extractor grip is hooked.
  • a mandrel assembly with controlled movement during rolling is used for rolling tubular billets (hollow shell) on continuous tube rolling mills of two- and three-roll type (MPM, PQF, FQM).
  • the retention rate of the mandrel assembly during rolling may be in the range from 500 to 2000 mm/s depending on rolled tube grades, equipment design features and selected parameters for rolling. Extracting the mandrel from the rolled material is carried out with a mill-extractor, which is located on the same line with the continuous mill.
  • the mandrel assembly consists of a cylindrical mandrel with a guiding taper section at the front end, which opposite end is connected to an extension element through a nipple connection, and in the same way the extension element is connected to a shank end (the rear end part of a mandrel assembly) to retain the mandrel in a gripper during rolling (U.S. Pat. No. 3,120,139, B21B 25/04, published on 4 Feb. 1964).
  • mandrel assembly When rolling with a mandrel assembly, hollow shells are deformed by a cylindrical mandrel, other elements of the mandrel assembly relate to a machine-tool attachment and may include one or more extension elements, a shank end, a plug fitting, various inserts, bushings and fixtures.
  • the working part of the mandrel assembly is operated under complex temperature conditions during the production process and is subjected to constant cyclic alternating loads, which intensify its wear from level of which the quality of finished tubes is depended.
  • a significant problem in the tube production on units with a continuous rolling mill is a short service life and a high cost of mandrels, which are mostly imported.
  • the critical value of mandrel wear is regarded as the mismatch of geometric parameters and the state of a mandrel surface to specified requirements.
  • the critical value of mandrel wear is specified in technological instructions of tube manufacturers.
  • the mandrels are taken out of service when exceeding the wear critical value that includes various parameters, for example: occurrence of sections where the wear value at an outer diameter is above the specified one, occurrence of the variety of surface inconsistencies in the form of “comets” on the mandrel surface, mechanical damage, rough cracks formed as a result of temperature influence, as well as when mandrel surface roughness exceeds the specified critical values.
  • the average specific mandrel consumption ranges from 0.1 to 4.0 kg/ton.
  • the specific consumption is regarded as the difference between weight of a worn mandrel before regrinding and mandrel weight after regrinding, referred to the number of rolled tons of products.
  • the technical problem solved in the Invention is to extend the service life of the mandrel through increasing the number of rolled tubes on the same mandrel, improving tubes surface quality and eliminating emergency situations during rolling.
  • the inventive continuous tube rolling method includes deformation of a tubular hollow shell using a cylindrical mandrel with identical coaxial blind openings at the ends, control of mandrel dimensions and mandrel regrinding.
  • the mandrel is connected with the mandrel assembly attachment alternately to deform the tubular hollow shell by working sections from different ends of the mandrel.
  • the deformation of the tubular hollow shell is carried out until the wear value is at least 25% of the critical value for one end of the mandrel working section.
  • the mandrel regrinding is carried out after changing the end connection of the mandrel with the mandrel assembly attachment, after subsequent deformation of the tubular hollow shells and the wear of the working section on the other mandrel end is at least 25% of the critical value.
  • the mandrel assembly of a continuous tube rolling mill comprising a cylindrical mandrel that is made with a beveled side surface at one end, has identical coaxial blind thread openings at the mandrel ends for an alternate connection through joining the mandrel to the mandrel assembly attachment according to the Invention, the opposite mandrel end is made with a beveled side surface, the angle of the beveled surfaces generatrix with the longitudinal mandrel axis at the both ends is the same and is in the range from 10 to 70 degrees, whereas the opening at the front mandrel end is plugged at the working position.
  • the invention is illustrated by the attached drawing, which schematically shows a mandrel assembly for the implementation of the method of continuous tube rolling.
  • the mandrel assembly includes a cylindrical mandrel 1 with a beveled side surface 2 at both ends and a machine-tool attachment in the form of an extension element 3 and a shank end 4 .
  • identical blind thread openings 5 are made for connecting the mandrel to the extension element 3 alternately by means of, for example, a nipple connection.
  • the opening at the mandrel front end is plugged with the plug fitting 6 to protect from external influence and prevent from clogging of scale and lubricant materials during rolling.
  • the mandrel assembly can be connected with the shank end 4 also by means of a nipple connection.
  • the wear of a section of the mandrel cylindrical part occurs mainly closer to the front mandrel end, whereas the mandrel section near to the opposite mandrel end is not almost subjected to the wear.
  • the deformation of the billets (hollow shells) is carried out until the wear value of the working mandrel section on the one end is at least 25% of its critical value.
  • the plug fitting is inserted into an opening at the front mandrel end and hollow shells are deformed. Furthermore, during the next operation cycle rolling is carried out on the unworn working mandrel section until the wear value reaches at least 25% of the critical value at the section on the other mandrel end. After wearing of the cylindrical mandrel is at least 25% of critical value almost along its entire length, the mandrel can be reground to other outer diameter along its entire length, which favor to increase the service mandrel life, taking into account the regulation of its wear value and improve the quality of finished tubes.
  • the mandrels wear value is regulated in the technological documentation of the enterprise and depends, in particular, on deformation modes on a continuous rolling mill, on power parameters of the process, on the range and steel grade of rolled tubes, on the temperature of rolled metal and rolling tools, on lubricants properties and antioxidants for different tubes grades.
  • the mandrel is designed in such a way that the angle of the beveled surfaces 2 generatrix with the longitudinal mandrel axis at the both ends is the same and is in the range from 10 to 70 degrees, which ensures to insert the mandrel easily into a hollow shell before rolling in a continuous rolling mill and favors the reduction of the number of defects on the inner tubes surface during the insertion and removal of the mandrel, as well as during rolling. If the generatrix angle is less than 10 degrees, there can be difficulties when the mandrel is inserted into a hollow shell and when the extractor takes a mother tube out, in addition defects on the inner surface of the rolled material are formed in the form of scratches and imprints.
  • the generatrix angle is more than 70 degrees, the possibility of cracks formation increases at the mandrel ends and in areas of blind openings, designed to connect with the machine-tool attachment, which reduces the reliability of the connection.
  • the angle of the beveled surfaces generatrix remains in the specified range, difficulties do not occur when the mandrel is inserted into a hollow shell and there is practically no formation of defects on the inner surface of a hollow shell.
  • Thread connections of all the elements of the mandrel assembly are made comparable to the connection of casing tubes and have a tapered trapezoidal thread or, for example, a Buttress thread. Before screwing, a lubricant is put on threads.
  • Such constructive design of the mandrel assembly allows increasing the mandrels service life, the quality of the inner tube surface and preventing accidents during rolling.
  • the proposed method for the continuous tubes rolling with the use of the mandrel assembly is as follows.
  • the mandrel assembly is inserted into a hollow shell and then, together with the hollow shell, is set into a continuous mill.
  • the hollow shell is deformed into a mother tube strictly on the cylindrical mandrel part, located between two sections with beveled side surfaces.
  • the wear of the cylindrical part section of the mandrel is formed mainly closer to the front end, and the section of the mandrel near to the opposite end practically does not wear out.
  • the plug fitting is removed from the opening at the front end of the mandrel, the mandrel is disconnected from the attachment, connected by the other end with the attachment and the plug fitting is inserted into the opening at the other mandrel end.
  • the operation of connecting and disconnecting components of the mandrel assembly can be carried out on a machine for screwing and unscrewing mandrels. After that, during the next cycle, the rolling process is carried out on the unworn section of the mandrel until it reaches a critical wear value at least of 25%.
  • the mandrel After wear of the cylindrical mandrel almost the entire length of at least 25% of the critical, the mandrel can be reground along its entire length to another outer diameter, which increases the service life of the mandrel and improves the quality of the finished tube.
  • the mandrel When implementing this method for rolling tubes, the mandrel is easily inserted into a hollow shell and removed, which leads to a significant reduction in the number of defects on the inner surface of the rolled material.
  • the operational mandrels life is significantly reduced, since in this case the average specific mandrels consumption increases from 2 to 40 times. Furthermore, the service life increases due to the possibility of using a plug fitting made without a thread, which reduces thread wear in the thread openings due to a smaller number of screwing and unscrewing operations.
  • the proposed method for the tubes production was tested on a PQF continuous tube mill.
  • mandrels with the diameter of 149.20 ⁇ 179.55 mm and with an angle of 25 degrees for the beveled surfaces generatrix at the both ends were used. Tubes were rolled using the 190 mm PQF mill calibration system. The most significant mandrels wear occurred at the section located at a distance of up to 5000 mm from the front mandrel end. The mandrel section, located at a distance from 5,000 and up to 11,500 mm (rear end) from the front end, was almost not subjected to wear.
  • the plug fitting was removed from the opening at the mandrel front end, the mandrel was joined to the extension element by another end, in particular, on an equipment for the mandrel screwing on and unscrewing, then, the mandrel was put into operation again. Thereafter, the mandrel was operated until its other end working section was worn at 75% of the critical value.
  • the wear occurred along the entire length of the working sections; both rolling cycles was characterized by stable operation of the mandrel assembly, without damage to the mandrel and threaded connections.
  • the depth of single defects of various types did not exceed critical values, the tubes quality was satisfactory.
  • the mandrels service life was increased by an average of 45.6%, emergency situations did not occur on a continuous rolling mill and mill-extractor.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Metal Extraction Processes (AREA)
US16/610,739 2017-05-10 2017-05-05 Continuous tube rolling method and mandrel assembly for the implementation thereof Abandoned US20200156127A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/RU2017/000296 WO2018208184A1 (ru) 2017-05-10 2017-05-10 Способ непрерывной прокатки труб и оправочный узел для его осуществления

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US (1) US20200156127A1 (ja)
EP (1) EP3623066A4 (ja)
JP (1) JP2020519452A (ja)
CN (1) CN110382126A (ja)
CA (1) CA3052867A1 (ja)
EA (1) EA036775B1 (ja)
MX (1) MX2019013406A (ja)
RU (1) RU2707052C1 (ja)
WO (1) WO2018208184A1 (ja)
ZA (1) ZA201907301B (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112474827A (zh) * 2020-10-28 2021-03-12 太原重工股份有限公司 用于减少限动芯棒定点磨损的自动控制方法

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Publication number Priority date Publication date Assignee Title
CN111203444B (zh) * 2020-01-07 2024-05-07 大冶特殊钢有限公司 用于薄壁无缝管生产的芯棒
CN112570448B (zh) * 2020-11-27 2023-04-14 中北大学 一种大型带内筋带导轨的矩形型材制造设备
JP7435652B2 (ja) * 2021-04-28 2024-02-21 Ｊｆｅスチール株式会社 マンドレルバー、管材の圧延方法および継目無管の製造方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112474827A (zh) * 2020-10-28 2021-03-12 太原重工股份有限公司 用于减少限动芯棒定点磨损的自动控制方法

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CA3052867A1 (en) 2018-11-15
EP3623066A4 (en) 2020-12-30
EA036775B1 (ru) 2020-12-21
EP3623066A1 (en) 2020-03-18
BR112019023482A2 (pt) 2020-06-30
MX2019013406A (es) 2020-08-17
JP2020519452A (ja) 2020-07-02
EA201800621A1 (ru) 2019-04-30
CN110382126A (zh) 2019-10-25
WO2018208184A1 (ru) 2018-11-15
RU2707052C1 (ru) 2019-11-21
ZA201907301B (en) 2023-11-29

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