EP2208547B1 - Magnesium hot rolling method and apparatus - Google Patents

Magnesium hot rolling method and apparatus Download PDF

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Publication number
EP2208547B1
EP2208547B1 EP08839763.3A EP08839763A EP2208547B1 EP 2208547 B1 EP2208547 B1 EP 2208547B1 EP 08839763 A EP08839763 A EP 08839763A EP 2208547 B1 EP2208547 B1 EP 2208547B1
Authority
EP
European Patent Office
Prior art keywords
magnesium
downstream
heating furnace
upstream
rolling
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.)
Not-in-force
Application number
EP08839763.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2208547A1 (en
EP2208547A4 (en
Inventor
Nobuhiro Tazoe
Hisashi Honjou
Hideo Matsumura
Katuhiko Yanai
Fumitaka Yanai
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.)
IHI Corp
Original Assignee
IHI Corp
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
Priority claimed from JP2007269058A external-priority patent/JP5173347B6/ja
Application filed by IHI Corp filed Critical IHI Corp
Publication of EP2208547A1 publication Critical patent/EP2208547A1/en
Publication of EP2208547A4 publication Critical patent/EP2208547A4/en
Application granted granted Critical
Publication of EP2208547B1 publication Critical patent/EP2208547B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
    • B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • B21B1/34—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by hot-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/12—End of product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product

Definitions

  • the present invention relates to a magnesium hot rolling method and to a magnesium hot rolling apparatus.
  • a round bar-shaped billet having, for example, a diameter of approximately 300 to 400 mm and a length of approximately 500 to 600 mm is molded by hot extrusion molding into a thick plate having a thickness of, for example, 10 mm or less.
  • This thick plate is then cut to a predetermined length (for example, 3 m) so as to form a cut plate material, and this cut plate material is then rolled to a thickness of not more than1 mm by rough rolling.
  • magnesium alloy In order to roll magnesium alloy at room temperature a large amount of pressure is required. However, even if a large amount of pressure is applied, it still cracks easily. Accordingly, it is preferably rolled using hot rolling.
  • FIG. 1 of patent document 1 Conventional examples of apparatuses for the hot rolling of magnesium alloy are disclosed in FIG. 1 of patent document 1 and FIG. 1 of patent document 2.
  • the hot rolling apparatuses disclosed in these patent documents are provided with a rolling mill which rolls the magnesium alloy while transporting it reciprocatingly, and with two heating furnaces which are located on the upstream side and the downstream side of the rolling mill.
  • the magnesium alloy is heated to a predetermined temperature by these heating furnaces and is rolled in the rolling mill.
  • the present invention was conceived in view of the above described circumstances and it is an object thereof to provide a magnesium hot rolling method and a magnesium hot rolling apparatus which are able to prevent any reduction in the quality of a product which is due to temperature variations during the hot rolling of a magnesium alloy.
  • a magnesium alloy hot rolling method which has: a first rolling step in which a magnesium plate is rolled reciprocatingly between an upstream heating furnace which is located on an upstream side of a rolling mill and which heats the magnesium plate, and a downstream heating furnace which is located on a downstream side of the rolling mill and which heats the magnesium plate; and a second rolling step in which the temperature of respective end portions of the magnesium plate on both the upstream and downstream sides is maintained while the magnesium plate is being rolled reciprocatingly between an upstream temperature maintaining apparatus which is located further on the upstream side than the upstream heating furnace and which transports the magnesium plate which has been heated by the upstream heating furnace while maintaining the temperature thereof, and a downstream temperature maintaining apparatus which is located further on the downstream side than the downstream heating furnace and which transports the magnesium plate which has been heated by the downstream heating furnace while maintaining the temperature thereof.
  • a wind-on step in which, while tension is applied by a tension applying apparatus which is located on the downstream side of the downstream temperature maintaining apparatus to the magnesium plate which has been rolled to a predetermined thickness, the magnesium plate is wound onto a winder which is placed further on the downstream side than the downstream temperature maintaining apparatus.
  • a magnesium alloy hot rolling apparatus which is provided with: a rolling mill which performs reciprocating rolling on a magnesium plate; an upstream heating furnace which is located on the upstream side of the rolling mill and which heats the magnesium plate; a downstream heating furnace which is located on the downstream side of the rolling mill and which heats the magnesium plate; an upstream temperature maintaining apparatus which is located further on the upstream side than the upstream heating furnace, and which transports the magnesium plate which has been heated by the upstream heating furnace and also maintains the temperature of upstream side end portions thereof; and a downstream temperature maintaining apparatus which is located further on the downstream side than the downstream heating furnace, and which transports the magnesium plate which has been heated by the downstream heating furnace and also maintains the temperature of downstream side end portions thereof.
  • a tension applying apparatus which is located on the downstream side of the downstream temperature maintaining apparatus and which applies tension to the magnesium plate; and a winder which is located further on the downstream side than the tension applying apparatus and onto which the magnesium plate is wound.
  • a magnesium plate is rolled while substantially the entire length thereof is being heated and held at a predetermined temperature, it is possible to suppress any drop in the temperature of the magnesium plate, and to prevent errors in the dimensional accuracy of a product as well as any consequent deterioration in product quality which are due to temperature variations during hot rolling, and to thus maintain a superior quality in a finished product.
  • FIG. 1 is a schematic front view showing the schematic structure of a hot rolling apparatus 100 (i.e., a magnesium alloy hot rolling apparatus) in the present embodiment.
  • a hot rolling apparatus 100 i.e., a magnesium alloy hot rolling apparatus
  • the hot rolling apparatus 100 is provided with a rolling mill 1, a first heating furnace 2, a second heating furnace 3, pinch rollers 4, a first table roller 5, a second table roller 6, a winder 7, and pinch rollers 8.
  • the rolling mill 1 has a pair of working rollers 1a that are in parallel with each other and also face each other, and with a drive source (not shown) which drives the working rollers I a to rotate.
  • the working rollers 1a are heating rollers whose surface temperature is raised to a suitable temperature and which, while feeding a magnesium cut plate material M0 (i.e., a magnesium plate) which is passing between the working rollers 1a in one direction, apply predetermined pressure to this magnesium cut plate material M0.
  • a magnesium cut plate material M0 i.e., a magnesium plate
  • the rolling mill 1 reduces the thickness of the magnesium cut plate material M0 so as to cause it to become elongated.
  • the rolling mill 1 performs reciprocating rolling by reversing the feed direction of the magnesium cut plate material M0 at a predetermined timing. By doing this, the rolling mill 1 reduces the thickness of the magnesium cut plate material M0 from, for example, a thickness of approximately 6 mm and a length of approximately 3 m to a thickness of approximately 1 mm and a length of approximately 18 m.
  • magnesium cut plate material M0 i.e., magnesium plate
  • magnesium alloy M0 which forms a work piece for this hot rolling apparatus 100 is a plate material formed from magnesium alloy
  • the first heating furnace 2 (i.e., the upstream heating furnace) is a heating furnace which is located on the upstream side of the rolling mill 1.
  • the second heating furnace 3 (i.e., the downstream heating furnace) is a heating furnace which is located on the downstream side of the rolling mill 1.
  • the pair of heating furnaces 2 and 3 have a length which is longer than that of the magnesium cut plate material M0 prior to rolling, and are also provided with heaters and transporting rollers (neither are shown).
  • the magnesium cut plate material M0 is heated by the heaters to a predetermined temperature (approximately 100 to 350 °C with 200 to 300 °C being preferable), and the magnesium cut plate material M0 is transported by the transporting rollers.
  • the pinch rollers 4 are heating rollers whose surface temperature is raised to a suitable temperature, and they provide auxiliary transporting for the magnesium cut plate material M0 which is traveling reciprocatingly in conjunction with the reciprocating rolling of the rolling mill 1.
  • a plurality of sets of these pinch rollers 4 are provided respectively between the rolling mill 1 and the first heating furnace 2, and between the rolling mill 1 and the second heating furnace 3.
  • the pinch rollers 4 can be made to apply suitable tension to the magnesium cut plate material M0 which is being rolled by the rolling mill 1.
  • the first table roller 5 i.e., the upstream temperature maintaining apparatus
  • the second table roller 6 i.e., the downstream temperature maintaining apparatus
  • These table rollers 5 and 6 each have transporting rollers 5a and 6a and temperature maintaining covers 5b and 6b.
  • the table rollers 5 and 6 transport and support the end portions of the magnesium cut plate material M0 which are protruding from the heating furnaces 2 and 3 using the transporting rollers 5a and 6a, and also shield them from the outside air by covering them with the temperature maintaining covers 5b and 6b.
  • the table rollers 5 and 6 maintain the temperature of the magnesium cut plate material M0 by not allowing heat to escape therefrom.
  • the temperature maintaining portion of the end portion of the magnesium cut plate material M0 which is positioned on the downstream side is moved inside the heating furnace during the subsequent rolling in the opposite direction.
  • the heating portion of the end portion which is positioned on the downstream side is placed inside the temperature maintaining apparatus during the rolling in the opposite direction, and by repeating this process alternatingly, it is possible to minimize any reduction in the temperature of the end portions.
  • the winder 7 is a machine onto which is wound the manufactured product obtained by rolling the magnesium cut plate material M0, namely, a magnesium sheet M1 (i.e., a magnesium plate).
  • the pinch rollers 8 are located in front of the winder 7 and by adjusting the transporting speed of the magnesium sheet M1, they are able to apply tension to the magnesium sheet M1 in the opposite direction from the wind-on direction of the winder 7.
  • the hot rolling apparatus 100 performs rough rolling on the magnesium cut plate material M0.
  • an operation of the hot rolling apparatus 100 will be described.
  • the magnesium cut plate materials M0 which are the objects to be rolled by this hot rolling apparatus 100 are manufactured by performing hot extrusion molding (at between approximately 100 and 300 °C with 200 °C being preferable) on a rod-shaped billet having, for example, a diameter of 300 to 400 mm and a length of 500 to 600 mm so as to mold it into a thick plate having a thickness of, for example, 10 mm or less (for example, 6 mm). This thick plate is then cut into predetermined lengths (for example, 3 m).
  • the crystal grains of the magnesium forming the magnesium cut plates M0 which have been molded by hot extrusion molding are mechanically refined by being extruded, they are extremely strong and are of high quality. They are also difficult to break and have superior press-moldability.
  • the magnesium cut plate materials M0 are transported from the first table rollers 5 to the first heating furnace 2. They are then heated to a predetermined temperature (approximately 100 to 350 °C with 200 to 300 °C being preferable) inside the first heating furnace 2 and are then transported to the rolling mill 1.
  • a predetermined temperature approximately 100 to 350 °C with 200 to 300 °C being preferable
  • the rolling mill 1 rolls the magnesium cut plate material M0 and, at the same time as this, transports it to the second heating furnace 3.
  • the temperature of the magnesium cut plate materials M0 drops somewhat as it moves from the first heating furnace 2 to the second heating furnace 3.
  • the working rollers 1a and the plurality of pinch rollers 4 are heating rollers, and because the magnesium cut plate material M0 is once again heated to the predetermined temperature inside the second heating furnace 3, there is little temperature variation.
  • the hot rolling apparatus 100 When the terminal end of a magnesium cut plate material M0 has passed through the rolling mill 1, the hot rolling apparatus 100 reverses the rolling direction. The hot rolling apparatus 100 repeats this process so that the magnesium cut plate material M0 is rolled reciprocatingly, and the thickness of the magnesium cut plate material M0 is sequentially reduced. As a result, a magnesium sheet M1 is manufactured.
  • the magnesium cut plate material M0 has a material quality of AZ31B, and has dimensions of a thickness of 6.00 mm, a width of 300 mm, and a length of 3000 mm.
  • the diameter of the working rollers 1a is 400 mm and the barrel length thereof is 500 mm, while the diameter of the pinch rollers 4 is 250 mm.
  • the heating temperature in the heating furnaces 2 and 3 is 220 °C
  • the pinch rollers 4 and the working rollers 1 a are heating rollers having internal heaters and the surface temperature of these heating rollers is 200 °C.
  • a magnesium cut plate material M0 having a thickness of 6.00 mm is changed by five passes of reciprocating rolling (i.e., by two and a half reciprocations) into a magnesium sheet M1 having a thickness of 1.01 mm, and this is then wound onto the winder 7 after the five passes.
  • the magnesium cut plate material M0 becomes gradually more elongated as it is rolled, and when the terminal end thereof has passed through the rolling mill 1, the end portions including the starting end protrude from the heating furnaces 2 and 3.
  • the table rollers 5 and 6 support the end portions which are protruding from the heating furnaces 2 and 3 using the transporting rollers 5a and 6a, and also maintain the temperature thereof by means of the temperature maintaining covers 5b and 6b.
  • a magnesium cut plate material M0 having a length L0 prior to rolling is rolled in a section A1 until it attains a length L1 (first rolling step). It is then rolled in a section A2 until it exceeds the length L1 and attains a length L2 (second rolling step). It is then wound on (winding-on step).
  • this hot rolling apparatus 100 performs reciprocating rolling using the first rolling step in the section A1, namely, in the section formed by the first heating furnace 2, the rolling mill 1, and the second heating furnace 3 while the magnesium cut plate material M0 has a length between L0 and L1.
  • the hot rolling apparatus 100 then performs reciprocating rolling using the second rolling step in the section A2, that is, in the section formed by the first table roller 5, the first heating furnace 2, the rolling mill 1, the second heating furnace 3, and the second table roller 6 after the magnesium cut plate material M0 has exceeded the length L1 and until it attains the length L2.
  • the finished product, namely, the magnesium sheet M1 is then wound onto the winder 7.
  • the magnesium cut plate M0 is heated or has its temperature maintained over its entire length, and is kept at a temperature which remains substantially within a fixed range. Accordingly, it is possible to prevent any reduction in the quality of a product which is due to temperature variations in the magnesium cut plate material M0, and it is possible to maintain a superior quality in the finished product, namely, in the magnesium sheet M1.
  • the magnesium cut plate material M0 is soft during the rolling process due to the high temperature, and there is a possibility that pitting will remain if high pressure is also applied to areas other than those areas where the rolling mill 1 is used.
  • this hot rolling apparatus 100 because the magnesium cut plate material M0 is nipped in a plurality of locations by a plurality of groups of pinch rollers 4, the force with which each pinch roller 4 nips the magnesium cut plate material M0 is small as a result of being dispersed, and any concern that pitting from the pinch rollers 4 will remain is reduced.
  • the hot rolling apparatus 100 winds this magnesium sheet M1 onto the winder 7 so as to form a coil material.
  • the pinch rollers 8 adjust the transporting speed of the magnesium sheet M1 so that predetermined tension is applied to the magnesium sheet M1 being wound onto the winder 7, and thereby apply tensile force to the magnesium sheet M1 in the opposite direction from the wind-on direction of the winder 7.
  • the hot rolling apparatus 100 of the present invention because the magnesium cut plate material M0 is rolled while substantially the entire length thereof is being heated and held at a predetermined temperature, it is possible to suppress any drop in the temperature of the magnesium cut plate material M0, and to prevent any reduction in the product quality which is due to temperature variations during the hot rolling, and it is thereby possible to maintain a superior quality in the finished product, namely, in the magnesium sheet M1.
  • the pinch rollers 8 function as a tension applying apparatus, however, the tension applying apparatus may also be formed by a leveler which flattens the magnesium sheet M1.
  • the leveler is formed by alternatingly combining three or more rollers in two rows in a beehive pattern when viewed in cross-section, and the magnesium sheet M1 is flattened as a result of the sheet-shaped material being passed between these rollers.
  • the magnesium hot rolling apparatus of the present invention and to the magnesium hot rolling method of the present invention which uses this apparatus, it is possible to prevent errors in the dimensional accuracy of a product as well as any consequent deterioration in product quality which are due to temperature variations during hot rolling, and to also maintain a superior quality in a finished product.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
EP08839763.3A 2007-10-16 2008-10-15 Magnesium hot rolling method and apparatus Not-in-force EP2208547B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007269058A JP5173347B6 (ja) 2007-10-16 マグネシウム合金熱間圧延方法及びマグネシウム合金熱間圧延装置
PCT/JP2008/068654 WO2009051134A1 (ja) 2007-10-16 2008-10-15 マグネシウム熱間圧延方法及びマグネシウム熱間圧延装置

Publications (3)

Publication Number Publication Date
EP2208547A1 EP2208547A1 (en) 2010-07-21
EP2208547A4 EP2208547A4 (en) 2013-04-03
EP2208547B1 true EP2208547B1 (en) 2014-07-30

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ID=40567396

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Application Number Title Priority Date Filing Date
EP08839763.3A Not-in-force EP2208547B1 (en) 2007-10-16 2008-10-15 Magnesium hot rolling method and apparatus

Country Status (8)

Country Link
US (1) US20110100083A1 (ru)
EP (1) EP2208547B1 (ru)
KR (1) KR101204494B1 (ru)
CN (1) CN101821025B (ru)
CA (1) CA2702659A1 (ru)
RU (1) RU2438806C1 (ru)
TW (1) TW200927315A (ru)
WO (1) WO2009051134A1 (ru)

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US9248482B2 (en) 2011-03-11 2016-02-02 Fata Hunter, Inc. Magnesium roll mill
KR101428308B1 (ko) * 2012-12-21 2014-08-07 주식회사 포스코 연연속 압연 방법 및 연연속 압연 장치
CN105149352B (zh) * 2015-09-30 2017-11-07 中镁镁业有限公司 变形镁合金板带材在线补温、恒温轧制与卷取的方法
CN108787762B (zh) * 2017-04-26 2019-10-25 中国宝武钢铁集团有限公司 一种镁合金自适应控温连续轧制的方法和系统
CN108787779B (zh) * 2017-04-26 2019-10-08 中国宝武钢铁集团有限公司 一种镁合金连挤控温连轧生产方法和系统
EP3711873B1 (en) 2019-03-22 2022-07-20 SSAB Technology AB Method and hot-rolling equipment

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Also Published As

Publication number Publication date
WO2009051134A1 (ja) 2009-04-23
CN101821025A (zh) 2010-09-01
RU2438806C1 (ru) 2012-01-10
CN101821025B (zh) 2013-10-30
JP2009095849A (ja) 2009-05-07
EP2208547A1 (en) 2010-07-21
KR20100072349A (ko) 2010-06-30
TW200927315A (en) 2009-07-01
JP5173347B2 (ja) 2013-04-03
CA2702659A1 (en) 2009-04-23
US20110100083A1 (en) 2011-05-05
EP2208547A4 (en) 2013-04-03
KR101204494B1 (ko) 2012-11-26

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