US20110067474A1 - Magnesium hot rolling apparatus - Google Patents

Magnesium hot rolling apparatus Download PDF

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Publication number
US20110067474A1
US20110067474A1 US12/682,798 US68279808A US2011067474A1 US 20110067474 A1 US20110067474 A1 US 20110067474A1 US 68279808 A US68279808 A US 68279808A US 2011067474 A1 US2011067474 A1 US 2011067474A1
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US
United States
Prior art keywords
magnesium alloy
temperature
rollers
rolling mill
hot rolling
Prior art date
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Abandoned
Application number
US12/682,798
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English (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
Primetals Technologies Holdings Ltd
Original Assignee
IHI Corp
IHI Metaltech Co Ltd
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.)
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Publication date
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Application filed by IHI Corp, IHI Metaltech Co Ltd filed Critical IHI Corp
Assigned to IHI CORPORATION, IHI METALTECH CO., LTD. reassignment IHI CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HONJOU, HISASHI, MATSUMURA, HIDEO, TAZOE, NOBUHIRO, YANAI, FUMITAKA, YANAI, KATUHIKO
Publication of US20110067474A1 publication Critical patent/US20110067474A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • 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
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/26—Special arrangements with regard to simultaneous or subsequent treatment of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/08—Lubricating, cooling or heating rolls internally
    • B21B2027/086—Lubricating, cooling or heating rolls internally heating internally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/006—Pinch roll sets

Definitions

  • the present invention relates to a magnesium alloy 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 approximately 1 mm by rough rolling.
  • This magnesium alloy coil which has a thickness of approximately 1 mm is then further rolled by finishing rolling so that a coil material having a thickness of approximately 0.2 to 0.5 mm or a coil having a thickness of 50 ⁇ m or less (for example, 30 to 40 ⁇ m) is manufactured.
  • Magnesium alloy not only requires a large amount of pressure if it is rolled at room temperature, but it also 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 reciprocatingly rolls the magnesium alloy, 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.
  • Patent document 1 Japanese Patent Publication No. 3521863
  • Patent document 2 Japanese Patent Publication No. 3821074
  • the winder portion at the distal end portion of the coil and the unprocessed portion at the rear end thereof are not able to be heated and rolled with any stability. Because of this, they cannot be used for finished product coils. Furthermore, they cause the yield to drop and have other drawbacks such as not allowing the production volume to be increased.
  • the present invention was conceived in view of the above described circumstances and it is an object thereof to provide a magnesium alloy hot rolling apparatus which prevents any reduction in the quality of a product which is due to temperature variations during the hot rolling of a magnesium alloy, and which makes it possible to improve the yield and increase the production volume.
  • the rolling mill in which winders that are able to apply heat to and then maintain the temperature of a magnesium alloy sheet while this sheet is in a coiled state are installed on both entry and exit sides of a rolling mill, and in which the magnesium alloy sheet undergoes a sequential thickness reduction via a plurality of reverse rollings, the rolling mill is provided with working rollers and back-up rollers whose surface temperature can be heated to a particular fixed temperature and then maintained at this temperature.
  • the rolling mill in the magnesium alloy hot rolling apparatus according to the above described first aspects of the present invention, it is also possible for the rolling mill to be a switchable stage rolling mill in which it is possible for small diameter working rollers which can be heated and then kept at a particular temperature to be installed.
  • the magnesium alloy hot rolling apparatus in the magnesium alloy hot rolling apparatus according to the above described first aspects of the present invention, it is also possible for a plurality of pairs of pinch rollers which incorporate vertical rollers which can be heated and then kept at a particular temperature to be placed between the rolling mill and each one of the pair winders so that stable transporting of the magnesium alloy coil is performed, and for tension adjustment apparatuses to be provided between the pinch rollers.
  • working rollers and back-up rollers of a rolling mill enables to heat a magnesium alloy sheet and maintain the temperature thereof, it is possible to prevent any reduction in product quality which is due to temperature variations during the hot rolling of a magnesium alloy sheet. Furthermore, it is possible to improve the yield and increase the production capacity, and to maintain a superior quality in a sheet material or foil material.
  • FIG. 1 is a typical view showing the schematic structure of a hot rolling apparatus in an embodiment of the present invention.
  • FIG. 2 is a typical view showing the schematic structure of a temperature maintaining and heating winder in the aforementioned embodiment.
  • FIG. 3A is a view showing an alteration of the setting of a rolling mill of the aforementioned embodiment.
  • FIG. 3B is a view showing an alteration of the setting of a rolling mill of the aforementioned embodiment.
  • FIG. 4A is a view showing an example of a different number of rolling mill stages in the aforementioned embodiment.
  • FIG. 4B is a view showing an example of a different number of rolling mill stages in the aforementioned embodiment.
  • FIG. 5 is a view showing the schematic structure of a tension adjustment apparatus in the aforementioned embodiment.
  • FIG. 1 is a front view showing the structure of a hot rolling apparatus 100 in the present embodiment.
  • the hot rolling apparatus 100 i.e., a magnesium alloy hot rolling apparatus
  • the hot rolling apparatus 100 is provided with a first temperature maintaining and heating winder 1 (winder), a second temperature maintaining and heating winder 2 (winder), a rolling mill 3 , a plurality of pairs of pinch rollers 4 , and a tension adjustment apparatus 5 .
  • FIG. 2 is a typical view showing the schematic structure of the first temperature maintaining and heating winder 1 and the second temperature maintaining and heating winder 2 .
  • the two temperature maintaining and heating winders 1 and 2 are provided with winder portions 1 a and 2 a and with heating and a temperature maintaining furnaces 1 b and 2 b.
  • the heating and a temperature maintaining furnaces 1 b and 2 b have internal heaters H.
  • These temperature maintaining and heating winders 1 and 2 are installed on both the entry and exit sides of the rolling mill 3 , and are able to heat up and then maintain the temperature of a magnesium alloy sheet while this sheet is in a coiled state. They are also able to freely wind on or unwind both end portions in a longitudinal direction of a magnesium alloy sheet S in a coil shape using the winder portions 1 a and 2 a , and to heat the interiors of the heating and a temperature maintaining furnaces 1 b and 2 b to a predetermined temperature (a first temperature) using the heaters H and then maintain this temperature. As a result, the magnesium alloy sheet S which has been wound into a coil shape (i.e., a magnesium alloy coil) is maintained at the predetermined temperature.
  • a predetermined temperature a first temperature
  • the aforementioned (first temperature) is, for example, approximately 100 to 350° C., and from 200 to 250° C. is preferable.
  • the rolling mill 3 (a rolling mill, a switchable stage rolling mill) has a pair of working rollers 3 a that are placed between the aforementioned pair of temperature maintaining and heating winders 1 and 2 in parallel with and facing each other and that are able to apply heat and maintain the temperature, a pair of back-up rollers 3 b that are provided in parallel with and facing the respective working rollers 3 a and that are able to apply heat and maintain the temperature, a housing 3 c which contains the two pairs of rollers 3 a and 3 b and supports them such that they are able to rotate freely, and a drive source (not shown) which drives the two pairs of rollers 3 a and 3 b to rotate.
  • the working rollers 3 a and the back-up rollers 3 b are heating rollers which can be heated so that the surface temperature thereof is raised to a fixed temperature and maintain the temperature thereof (a second temperature), and, while feeding the magnesium alloy sheet S in one direction between the working rollers 3 a , are able to heat the magnesium alloy sheet S so as to raise the temperature thereof and roll it at the same time. Thereby, the thickness of the magnesium alloy sheet S is reduced.
  • the working rollers 3 a and the back-up rollers 3 b have a structure in which, for example, a plurality of rod-shaped cartridge heaters are embedded at predetermined intervals in the axial direction at positions which are a predetermined depth from the surface.
  • the aforementioned (second temperature) is, for example, approximately 150 to 350° C. or less.
  • the rolling mill 3 stably reduces the thickness of the magnesium alloy sheet S so as to cause it to become elongated.
  • the rolling mill 3 performs reciprocating rolling by reversing the feed direction of the magnesium alloy sheet S at a predetermined timing. By doing this, the rolling mill 3 causes the magnesium alloy sheet S to become elongated by reducing the thickness thereof from, for example, a thickness of approximately 1 mm to a thickness of approximately 0.2 to 0.5 mm or to 50 ⁇ m or less (for example, to 30 to 40 ⁇ m).
  • the rolling mill 3 of the present embodiment is a switchable stage rolling mill in which it is also possible for small diameter working rollers to be installed.
  • FIG. 3A shows a rolling mill 3 which has been set as a four-stage structure (i.e., the structure shown in FIG. 1 ), while FIG. 3B shows a rolling mill 3 which has been set as a ten-stage structure.
  • This type of rolling mill 3 is normally set as the four-stage structure shown in FIG. 3A , however, for a thin material, for example, for a 50 ⁇ m foil material, as is shown in FIG. 3B , the rolling mill 3 can be altered to a ten-stage structure which has a pair of small-diameter working rollers 3 d and two vertically aligned pairs of horizontal support rollers 3 e provided on an intermediate path thereof.
  • FIG. 4 shows another structural example of this type of rolling mill 3 .
  • FIG. 4A shows a rolling mill 31 having a six-stage structure
  • FIG. 4B shows a rolling mill 32 having a ten-stage structure.
  • the rolling mill 31 has a pair of working rollers 3 a and two pairs of back-up rollers 3 b
  • the rolling mill 32 has a pair of working rollers 3 a and four pairs of back-up rollers 3 b.
  • the two pairs on the inner side i.e., the ones in contact with the working rollers 3 a
  • the two pairs on the inner side are known as intermediate rollers.
  • the pinch rollers 4 have a plurality of rod-shaped cartridge heaters embedded at predetermined intervals in the axial direction at positions which are a predetermined depth from the surface.
  • These pinch rollers 4 are heating rollers whose surface temperature is raised to a suitable temperature and the temperature is maintained (for example, from 150° C. to 350° C.), and provide auxiliary transporting for the magnesium alloy sheet S which is traveling left or right in conjunction with the reciprocating rolling of the rolling mill 3 .
  • a plurality of sets of these pinch rollers 4 are provided respectively between the rolling mill 3 and the first temperature maintaining and heating winder 1 , and between the rolling mill 3 and the second temperature maintaining and heating winder 2 .
  • the pinch rollers 4 can be made to impart suitable tensile force to the magnesium alloy sheet S which is being rolled by the rolling mill 3 .
  • the tension adjustment apparatuses 5 are sandwiched between two adjacent pairs of pinch rollers 4 and, as is shown in FIG. 5 , are each provided with two fixed rollers 5 a and one dancer roller 5 b .
  • the magnesium alloy sheet S is entrained such that the dancer roller 5 b is suspended between the two fixed rollers 5 a by the magnesium alloy sheet S, and the tension thereof is controlled by the vertical movement of the dancer roller 5 b such that measurement values of a separately installed tension meter (not shown) stay constant.
  • a hot rolling apparatus 100 performs finishing rolling on the magnesium alloy sheet S.
  • the operation of the hot rolling apparatus 100 will be described.
  • the magnesium alloy sheet S is rolled by the rolling mill 3 while being transported in one direction by being unwound from the first temperature maintaining and heating winder 1 and wound onto the second temperature maintaining and heating winder 2 , or by being unwound from the second temperature maintaining and heating winder 1 and wound onto the first temperature maintaining and heating winder 2 .
  • the temperature of the magnesium alloy sheet S drops somewhat between the first temperature maintaining and heating winder 1 and the second temperature maintaining and heating winder 2 .
  • the working rollers 3 a , the back-up rollers 3 b and the pinch rollers 4 are heating rollers, there is little temperature drop or temperature variation in the material caused by the material contacting these rollers.
  • the hot rolling apparatus 100 When the unwinding of the magnesium alloy sheet S from the first temperature maintaining and heating winder 1 (or the second temperature maintaining and heating winder 2 ) has finished, the hot rolling apparatus 100 reverses the rolling direction. The hot rolling apparatus 100 repeats this process so that the magnesium alloy sheet S is rolled reciprocatingly, and the thickness of the magnesium alloy sheet S is sequentially reduced. As a result, a sheet material having a thickness of approximately 0.2 to 0.5 mm, or a foil material having a thickness of 50 ⁇ m or less (for example, 30 to 40 ⁇ m) is manufactured.
  • the magnesium alloy sheet S is a coil material having a material quality of AZ31B, a thickness of 1.00 mm, and a width of 300 mm.
  • the rolling mill 3 has four stages. The diameter of each roller of the working roller pairs 3 a is 165 mm and the barrel length thereof is 500 mm, while the diameter of each of the back-up rollers 3 b is 300 mm, and the diameter of each of the pinch rollers 4 is 150
  • the temperature which the interiors of the two temperature maintaining and heating winders 1 and 2 are heated to and held at is 250° C.
  • the working rollers 3 a , the back-up rollers 3 b , and the pinch rollers 4 are heating rollers having internal heaters and the surface temperature of these is set to 200° C.
  • the rolling speed was set to a fixed speed of 30 m/minute, and nine passes (i.e., four and a half reciprocations) of reciprocating rolling were performed resulting in a foil material having a final thickness of 0.04 mm being obtained.
  • the rolling mill was switched to a ten-stage small-diameter mill (i.e., to working rollers having a diameter of ⁇ 60 mm), and this was subsequently used until the final pass (i.e., the ninth pass).
  • the magnesium alloy sheet S 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 3 is used.
  • the hot rolling apparatus 100 of the present invention because the magnesium alloy sheet S 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 alloy sheet S is small as a result of being dispersed, and there is no concern that pitting from the pinch rollers 4 will remain.
  • the tension of the magnesium alloy sheet S is kept constant from one pinch roller 4 to the next pinch roller 4 by the tension adjustment apparatus 5 .
  • any twisting or wrinkling of the magnesium alloy sheet S is prevented, and stable rolling is guaranteed.
  • this type of hot rolling apparatus 100 because a magnesium alloy sheet S is rolled while substantially the entire length thereof is heated and held at a predetermined temperature, it is possible to suppress any drop in the temperature of the magnesium alloy sheet S, and it is possible to prevent any deterioration in the quality of a product which is caused by temperature variations during the hot rolling. Accordingly, it is possible to improve the yield and increase the production volume, and it is also possible to maintain a superior finished product, namely, a superior quality in the sheet material or foil material.
  • the magnesium alloy hot rolling apparatus of the present invention is constructed such that working rollers and back-up rollers of the rolling mill are able to apply heat to a magnesium alloy sheet and to hold the temperature thereof, it is possible to prevent any deterioration in the quality of a product which is caused by temperature variations during the hot rolling of the magnesium alloy sheet. Furthermore, it is possible to improve the yield and increase productivity, and it is also possible to maintain a superior quality in the sheet material or foil material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)
US12/682,798 2007-10-16 2008-10-16 Magnesium hot rolling apparatus Abandoned US20110067474A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2007-269057 2007-10-16
JP2007269057A JP5264140B2 (ja) 2007-10-16 2007-10-16 マグネシウム合金熱間圧延装置
PCT/JP2008/068745 WO2009051176A1 (ja) 2007-10-16 2008-10-16 マグネシウム合金熱間圧延装置

Publications (1)

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US20110067474A1 true US20110067474A1 (en) 2011-03-24

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US12/682,798 Abandoned US20110067474A1 (en) 2007-10-16 2008-10-16 Magnesium hot rolling apparatus

Country Status (9)

Country Link
US (1) US20110067474A1 (de)
EP (1) EP2213387B1 (de)
JP (1) JP5264140B2 (de)
KR (1) KR101204497B1 (de)
CN (2) CN101821024A (de)
CA (1) CA2702723A1 (de)
RU (1) RU2449844C2 (de)
TW (1) TW200927314A (de)
WO (1) WO2009051176A1 (de)

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US20120244373A1 (en) * 2009-11-24 2012-09-27 Sumitomo Electric Industries, Ltd. Method for producing magnesium alloy sheet and magnesium alloy coil stock
US20120276402A1 (en) * 2009-11-24 2012-11-01 Sumitomo Electric Industries, Ltd. Magnesium alloy coil stock
CN102773255A (zh) * 2012-07-20 2012-11-14 北京科技大学 一种镁合金薄板带卷连续异步轧制装置
US9248482B2 (en) 2011-03-11 2016-02-02 Fata Hunter, Inc. Magnesium roll mill
KR101843203B1 (ko) * 2011-01-24 2018-05-14 아헨바흐 부쉬휘텐 게엠베하 운트 콤파니 카게 피니시 롤링 장치 및 피니시 롤링 장치에서 마그네슘 스트립을 제조하기 위한 방법
US11325171B2 (en) * 2017-02-17 2022-05-10 Samsung Electronics Co., Ltd. Apparatus of manufacturing panel for home appliance and method of manufacturing the home appliance

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CN103240281B (zh) * 2013-05-07 2015-05-20 太原科技大学 一种轧制镁合金输送辊道的保温装置
CN103480650A (zh) * 2013-10-09 2014-01-01 重庆市科学技术研究院 镁合金板轧制工艺
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CN103752647B (zh) * 2013-12-25 2016-02-03 中国重型机械研究院股份公司 重卷机组带材高速运行多辊稳定系统
JP6303820B2 (ja) * 2014-05-29 2018-04-04 東洋製罐株式会社 パウチの搬送装置
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CN104438329A (zh) * 2014-12-08 2015-03-25 太原科技大学 一种镁合金板材的轧制方法
CN105149355B (zh) * 2015-09-30 2017-09-01 中镁镁业有限公司 宽幅镁合金板状带材的异步温轧装置
CN105290108B (zh) * 2015-11-30 2017-07-07 太原科技大学 一种镁合金薄板带耦合变形组合轧制系统及其轧制方法
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CN108787746B (zh) * 2017-04-26 2021-03-12 中国宝武钢铁集团有限公司 一种连挤连轧控温生产镁合金产品的生产线
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CN108471647A (zh) * 2018-03-29 2018-08-31 苏州雪牛商贸有限公司 一种用于镁合金的加热装置
CN111842497A (zh) * 2020-07-21 2020-10-30 山西盛镁科技有限公司 金属板带材接触式在线加热恒温轧制系统及其轧制工艺

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EP2213387A1 (de) 2010-08-04
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WO2009051176A1 (ja) 2009-04-23
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KR101204497B1 (ko) 2012-11-26
CN103639199A (zh) 2014-03-19

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