WO2011122390A1 - コイル材及びその製造方法 - Google Patents
コイル材及びその製造方法 Download PDFInfo
- Publication number
- WO2011122390A1 WO2011122390A1 PCT/JP2011/056722 JP2011056722W WO2011122390A1 WO 2011122390 A1 WO2011122390 A1 WO 2011122390A1 JP 2011056722 W JP2011056722 W JP 2011056722W WO 2011122390 A1 WO2011122390 A1 WO 2011122390A1
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- WIPO (PCT)
- Prior art keywords
- plate
- cast
- coil material
- temperature
- magnesium alloy
- Prior art date
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- 239000000463 material Substances 0.000 title claims abstract description 723
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- 238000004804 winding Methods 0.000 claims abstract description 163
- 238000009749 continuous casting Methods 0.000 claims abstract description 62
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- 229910052710 silicon Inorganic materials 0.000 claims description 18
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- 229910052782 aluminium Inorganic materials 0.000 claims description 16
- 239000011777 magnesium Substances 0.000 claims description 14
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- 230000002093 peripheral effect Effects 0.000 claims description 6
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 6
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- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 11
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- 229910018137 Al-Zn Inorganic materials 0.000 description 2
- 229910018573 Al—Zn Inorganic materials 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 229910019018 Mg 2 Si Inorganic materials 0.000 description 2
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 2
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- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 1
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- 229910019406 Mg—Si Inorganic materials 0.000 description 1
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 1
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
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- 239000000378 calcium silicate Substances 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
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- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
-
- 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
- B21C47/02—Winding-up or coiling
- B21C47/04—Winding-up or coiling on or in reels or drums, without using a moving guide
-
- 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
- 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
- B21C47/32—Tongs or gripping means specially adapted for reeling operations
- B21C47/326—Devices for pressing the end of the material being wound against the cylindrical wall of the reel or bobbin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
-
- 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
- B21B3/003—Rolling non-ferrous metals immediately subsequent to continuous casting, i.e. in-line rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/68—Furnace coilers; Hot coilers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12292—Workpiece with longitudinal passageway or stopweld material [e.g., for tubular stock, etc.]
Definitions
- the present invention relates to a coil material made of a cast material of magnesium alloy suitable for a material of a magnesium alloy member, a manufacturing method thereof, a magnesium alloy plate material manufactured using the coil material, a manufacturing method thereof, and a coil material suitable for manufacturing the coil material.
- This relates to a winder.
- the present invention relates to a coil material that can contribute to an improvement in productivity of a high-strength magnesium alloy member and a manufacturing method thereof.
- a magnesium alloy that is lightweight and excellent in specific strength and specific rigidity is being studied.
- the members made of magnesium alloy are mainly cast materials by die casting method or thixomold method (for example, ASTM standard AZ91 alloy). In recent years, it is a plate made of expanded magnesium alloy represented by ASTM standard AZ31 alloy. Pressed members are being used.
- Patent Document 1 discloses that a rolled plate made of an AZ91 alloy or an alloy containing Al at the same level as the AZ91 alloy is manufactured under specific conditions and subjected to press working.
- Patent Document 2 discloses a technique for producing a cast material as a material for such a rolled plate by a twin roll type continuous casting apparatus.
- the twin-roll type continuous casting apparatus is an apparatus that obtains a plate-shaped cast material by supplying molten metal between a pair of casting rolls rotating in opposite directions and rapidly solidifying the molten metal between the casting rolls.
- Cast material produced by this twin-roll continuous casting machine is usually rolled up and wound on a take-up reel, and the take-up reel is transported to a separate secondary processing site, or the customer. Or shipped first.
- Patent Document 3 discloses a casting nozzle suitable for a twin roll type continuous casting apparatus. This nozzle is configured by combining a pair of main body plates arranged apart from each other and rectangular parallelepiped side dams arranged on both sides of both main body plates, and the opening is rectangular.
- magnesium alloys with high strength, corrosion resistance, flame retardancy, etc. have a high content of additive elements.
- the AZ91 alloy containing more Al than the AZ31 alloy has higher tensile strength than the AZ31 alloy and is excellent in corrosion resistance.
- a processed material obtained by adding various plastic processing such as rolling, forging, drawing, and pressing to the cast material has higher strength than the cast material.
- the members such as the casing In general, it is desirable for the members such as the casing to have high strength and rigidity and excellent corrosion resistance. However, it is difficult to produce a member made of a magnesium alloy having excellent properties such as strength and corrosion resistance with high productivity.
- a magnesium alloy member having excellent strength is produced by subjecting a rolled plate to plastic working such as pressing
- a continuously produced long rolled plate is used as a material, it is cut into a predetermined length. It is expected that the yield can be reduced and the productivity can be improved as compared with the case where a unit-length rolled plate is used as the material.
- a cast material made of a high-strength magnesium alloy it is difficult to manufacture the cast material long and wind up the long body.
- the present inventors examined a plate-shaped cast material having a tensile strength of 250 MPa or more as an example of a material for producing a high-strength magnesium alloy member.
- the tensile strength of the cast material is 250 MPa or more by using a magnesium alloy containing 7.3 mass% or more in total of elements such as Al, Zr, Y, Si, Zn, and Ca as additive elements. can do.
- a magnesium alloy satisfying the above-described tensile strength for example, in the case of an Mg—Al—Zn-based magnesium alloy, an alloy containing Al in an amount of 7.3 mass% or more can be cited.
- a magnesium alloy with a high concentration of such additive elements a casting material having excellent surface properties such as substantially no discoloration (mainly due to oxidation) on the surface and few defects such as minute centerline segregation.
- the temperature of the cast material is lowered at a rate of about 25 ° C./min to 50 ° C./min after casting due to natural cooling.
- the magnesium alloy has a hexagonal crystal structure (hcp structure)
- the plastic workability at room temperature is poor. Therefore, the plastic workability is deteriorated due to the above-mentioned temperature drop, and the conventional winder takes up. It is difficult.
- the cast structure is a structure in which fragile microsegregation rich in the additive element is generated in the vicinity of the columnar crystal. Due to this segregation, the cast material has poor toughness, and the curvature (allowable bending radius) that can be bent without cracking is limited. Therefore, with a conventional winder, it is difficult to wind a long cast material produced continuously without causing cracks or the like. Although it is conceivable to increase the radius of the winding drum of the winding machine in accordance with the allowable bending radius, it is not practical because the winding mechanism needs to be enlarged due to the increase in size of the winding drum.
- a magnesium alloy having a low concentration of additive elements such as AZ31 alloy has a toughness that can be bent even at room temperature. I can't get it.
- the wound casting material has defects due to undissolved portions, surface deterioration due to oxidation, and the like. Therefore, it is necessary to remove these defects and the surface layer before the next step such as rolling, which leads to a decrease in productivity of the magnesium alloy member.
- the edge of the cast plate tends to have a lower flow rate of the molten metal than the center portion of the cast plate, so that the edge is likely to be chipped or cracked. Therefore, when performing processing such as rolling on the cast plate, trimming both edge portions of the cast plate to adjust to a predetermined width is performed before the processing. If the crack at the edge extends to the center portion, the amount of trimming increases, a predetermined width cannot be secured, and the yield decreases. Therefore, it is desirable to reduce edge cracks in the production of long cast materials. However, a manufacturing method and a shape of a cast material that can effectively reduce the cracking of the edge have not been sufficiently studied.
- the molten metal existing in the vicinity of the end portion in the nozzle is cooled by the side dam, and solidified matter may be locally generated in the vicinity of the side dam.
- the solidified material further cools the surrounding molten metal or reduces the flow rate of the molten metal flowing toward the nozzle opening, thereby gradually increasing the solidified region. Large cracks or cracks may occur at the edges of the film.
- the flow rate of the molten metal flowing in the vicinity of the corner portion in the nozzle tends to be relatively slower than the molten metal flowing in a portion other than the corner portion.
- the molten metal with which the said corner part was filled tends to become relatively low temperature compared with the molten metal which flows through places other than a corner part. Accordingly, the molten metal filled in the corners of the nozzle is easily solidified, and due to the solidified product, the edge portion is chipped or cracked as described above. In the worst case, the desired plate width is obtained by solidification. If the cast plate cannot be obtained, casting may have to be stopped.
- long cast plates such as 30 m or more, especially 100 m or more are continuously manufactured. It is not desirable to stop casting in the middle. Therefore, it is desired to develop a production method that can continuously and stably produce a long cast plate and a shape of a cast material that can be produced continuously and stably.
- one of the objects of the present invention is to provide a coil material that can contribute to the improvement of productivity of a high-strength magnesium alloy member, and a manufacturing method thereof.
- Another object of the present invention is to provide a magnesium alloy plate suitable for the material of the magnesium alloy member and a method for producing the same.
- Another object of the present invention is to provide a coil material winding machine suitable for manufacturing a coil material made of a magnesium alloy casting material.
- the manufacturing method of the present invention regulates the temperature of the cast material immediately before winding when manufacturing a plate-shaped cast material by continuous casting. Specifically, it is a method of manufacturing a coil material in which a plate material made of metal is wound into a cylindrical shape to form a coil material.
- This plate-like material is a magnesium alloy cast material discharged from a continuous casting machine and has a thickness t (mm) of 7 mm or less. And the next winding process is provided.
- Winding step The surface strain ((t / R) ⁇ 100) expressed by the thickness t of the plate-like material and the bending radius R (mm) immediately before winding the plate-like material.
- a cast material plate-shaped material having a relatively low toughness such as an elongation el r at room temperature of 10% or less can be easily wound, so that a cast coil material can be produced with high productivity.
- the manufacturing method of the present invention for example, even when the radius of the winding drum around which the casting material is wound is smaller than the allowable bending radius at room temperature of the casting material, the winding drum is used.
- the cast material can be easily wound up.
- the magnesium alloy cast coil material whose thickness of a plate-shaped material is 7 mm or less is a magnesium alloy cast coil material with little segregation in a plate-shaped material. This is because if the thickness of the plate-shaped material to be produced is thin, it is rapidly solidified rapidly to the center of the plate-shaped material at the time of rapid solidification at the time of casting, so that segregation hardly occurs in the cast material.
- the following coil material of the present invention is obtained by the above-described manufacturing method of the present invention.
- the coil material of the present invention is made of a magnesium alloy cast plate, has a thickness of 7 mm or less, an elongation at room temperature of 10% or less, and is wound into a cylindrical shape.
- This cast coil material can be wound to a small diameter while being a cast material with relatively low toughness.
- a high-strength magnesium alloy member can be obtained if this cast coil material is used as a raw material. Further, the dimensions of the cast coil material can be reduced. Therefore, it is expected that the production method of the present invention and the coil material of the present invention can contribute to the improvement of productivity of a high strength magnesium alloy member.
- the magnesium alloy sheet of the present invention can be obtained by subjecting the coil material of the present invention to the following various treatments.
- the solidus temperature of the magnesium alloy constituting the coil material is Ts (K) and the heat treatment temperature is Tan (K)
- Tan (K) the heat treatment temperature Tan (K) satisfying Tan ⁇ Ts ⁇ 0.8 is maintained.
- a plate is manufactured by performing a heat treatment for 30 minutes or more.
- a plate material is manufactured using a portion of t ⁇ 90% or more with respect to the thickness t of the coil material.
- the coil material is rolled to a rolling reduction of less than 20% to produce a plate material.
- the coil material obtained by the production method of the present invention and the coil material of the present invention can be made long, the material can be continuously supplied to a secondary process such as rolling by using these as a material. Therefore, by using these cast coil materials, a magnesium alloy member including the magnesium alloy plate material of the present invention can be manufactured with high productivity.
- This winder is a coil material winder for winding a plate-like material continuously produced by a continuous casting machine into a cylindrical shape.
- This plate-like material is made of a magnesium alloy.
- this winding machine is provided with the chuck
- This winder can easily control the temperature of the plate-like material at the start of winding and immediately after starting by providing a predetermined heating means.
- the coil material of the present invention can be easily manufactured with high productivity.
- the magnesium alloy sheet material of the present invention can be produced with high productivity by the method for producing the magnesium alloy sheet material of the present invention using the coil material of the present invention.
- the coil material winding machine of the present invention can be suitably used for manufacturing the coil material of the present invention.
- FIG. 1 is a schematic explanatory view for explaining a manufacturing process of a coil material of the present invention
- FIG. 1A shows an example in which a heating means is provided between a continuous casting machine and a winder.
- FIG. 1 is a schematic explanatory view for explaining a manufacturing process of the coil material of the present invention
- FIG. 1B shows an example in which a winder is provided with heating means.
- FIG. 2 shows the heating temperature T and surface strain (t / R) when bending was performed at various bending radii R in producing a magnesium alloy cast coil material having various thicknesses t in Test Example 1-1. It is a graph which shows the relationship.
- FIG. 1 is a schematic explanatory view for explaining a manufacturing process of a coil material of the present invention
- FIG. 1A shows an example in which a heating means is provided between a continuous casting machine and a winder.
- FIG. 1B shows an example in which a winder is provided with heating means.
- FIG. 2 shows the heating temperature
- FIG. 3 shows the heating temperature T and surface strain (t / R) when bending was performed at various bending radii R in manufacturing a magnesium alloy cast coil material having various thicknesses t in Test Example 1-2. It is a graph which shows the relationship.
- FIG. 4A is a schematic cross-sectional view showing an example of a chuck portion provided in the winder.
- FIG. 4B is a schematic cross-sectional view illustrating an example of a chuck portion in which a plate material is bent substantially along the shape of a convex portion or a concave portion.
- FIG. 5 is a graph showing the relationship between the test temperature and the elongation at break when a tensile test was performed on the twin roll cast material of the AZ91 alloy.
- FIG. 6 is a schematic view of a production facility for a magnesium alloy cast coil material shown in Embodiment 2-1, and FIG. 6A is a top view.
- FIG. 6 is a schematic view of a production facility for a magnesium alloy cast coil material shown in Embodiment 2-1, and FIG. 6B is a side view.
- FIG. 7 is a schematic diagram for explaining the definitions of w and d in the magnesium alloy cast coil material.
- w is the width of the coil material
- d is the maximum distance from a straight line circumscribing both end faces of the coil material to the outer peripheral surface of the coil material.
- FIG. 8A is a schematic perspective view schematically showing a cast plate constituting the magnesium alloy cast coil material of Embodiment 3-2.
- FIG. 8B is a cross-sectional view schematically showing a casting nozzle used in the method for producing a magnesium alloy cast coil material of Embodiment 3-2.
- FIG. 9A is a schematic perspective view schematically showing a cast plate constituting the magnesium alloy cast coil material of Embodiment 3-3.
- FIG. 9B is a cross-sectional view schematically showing a casting nozzle used in the method for producing a magnesium alloy cast coil material according to Embodiment 3-3.
- FIG. 10 schematically shows the vicinity of an opening of a casting nozzle used in the method for producing a magnesium alloy cast coil material of Embodiment 3-4, and
- FIG. 10A is a perspective view.
- FIG. 10 schematically shows the vicinity of an opening of a casting nozzle used in the method for producing a magnesium alloy cast coil material of Embodiment 3-4
- FIG. 10B is a plan view seen from the main body plate side.
- Embodiment 1-1 [Cast coil material, Magnesium alloy sheet] (composition)
- the magnesium alloy constituting the coil material of the present invention and the magnesium alloy plate material of the present invention include those having various compositions containing Mg as an additive element (remainder: Mg and impurities).
- the continuously cast cast material has various compositions satisfying an elongation at room temperature of 10% or less.
- a composition satisfying a tensile strength at room temperature of 250 MPa or more is preferable.
- a typical composition includes one having a total content of additive elements of 7.3% by mass or more. The more additive elements, the better the strength and corrosion resistance.
- the additive element is, for example, at least one selected from Al, Si, Ca, Zn, Mn, Sr, Y, Cu, Ag, Sn, Li, Zr, Ce, Be, and rare earth elements (excluding Y and Ce). These elements are mentioned.
- Mg-Al alloys containing Al are excellent in corrosion resistance, and as the amount of Al increases, the corrosion resistance tends to be excellent. However, if too much, the plastic workability is lowered. Therefore, the content of Al in the Mg-Al alloy is preferably 2.5% by mass or more and 20% by mass or less, and particularly preferably 7.3% by mass or more and 12% by mass or less.
- the total content of additive elements other than Al in the Mg-Al alloy is preferably 0.01% by mass or more and 10% by mass or less, particularly preferably 0.1% by mass or more and 5% by mass or less.
- Mg—Al based alloy an intermetallic compound such as Mg 17 Al 12 is precipitated, and the precipitate particles are uniformly dispersed, whereby strength and rigidity can be increased.
- Mg-Al alloy include an AZ alloy (Mg-Al-Zn alloy, Zn: 0.2 mass% to 1.5 mass%) and an AM alloy (Mg-Al- Mn-based alloy, Mn: 0.15 mass% to 0.5 mass%), AS-based alloy (Mg-Al-Si-based alloy, Si: 0.3 mass% to 4 mass%), others, Mg-Al- Examples thereof include RE (rare earth element) -based alloys.
- the AZ-based alloy include alloys containing Al in the range of 8.3% to 9.5% by mass and Zn in the range of 0.5% to 1.5% by mass, typically the AZ91 alloy.
- the mechanical properties such as strength, rigidity, toughness, and heat resistance of the magnesium alloy are improved. It can be improved and is preferable.
- Mg—Si based alloys containing Si and Mg—Ca based alloys containing Ca are more likely to produce precipitates than Mg 17 Al 12 (Mg 2 Si, Al 2 Ca, etc.). It is expected that the effect of improving strength by precipitates is great.
- the elements such as Si, Ca, Zn, and Sn are industrially beneficial because they have a relatively large reserve and are available at low cost.
- the strengthening improvement effect due to the dispersion of the precipitate particles described above mainly depends on the content of the additive element.
- Si that forms an intermetallic compound with Mg
- its content is 2.71 times (when the atomic weight of Mg is 24 and the atomic weight of Si is 28, the atomic weight 76 of Mg 2 Si depends on the atomic ratio of Si.
- Al that forms an intermetallic compound with Mg
- the content is 2.26 times (Mg atomic weight: 24, Al).
- the atomic weight is set to 27, it is possible to expect the strength improvement effect of the atomic weight 732 of Mg 17 Al 12 divided by the amount corresponding to the atomic ratio of Al (27 ⁇ 12).
- the content thereof is 2.35 times (when the atomic weight of Al is 27 and the atomic weight of Ca is 40, the atomic weight 94 of Al 2 Ca is set according to the atomic ratio of Ca. It is possible to expect an effect of improving the strength (value divided by 40 ⁇ 1).
- the atomic ratio of Al in Al 2 Ca is The amount of Al that contributes to strength improvement is reduced because Al corresponding to 54: the amount obtained by dividing 54 by the atomic ratio of Ca: 40) is consumed for precipitation with Ca.
- the magnesium alloy contains at least one element selected from Al, Ca, and Si and satisfies the above formula value D ⁇ 14.5 as an index of a preferable content of the additive element.
- this formula value D is not followed about the element (solid solution type element) which increases in strength by dissolving in the ⁇ phase of the magnesium alloy.
- the elongation at room temperature (about 20 ° C.) satisfies 10% or less (excluding 0%). The higher the tensile strength, the lower the elongation. Depending on the composition of the magnesium alloy, the elongation may be 5% or less, and further 4% or less. In order to stably produce a cast coil material, the elongation at room temperature is preferably 0.5% or more.
- the cast coil material of the present invention has a low elongation at room temperature, but since it has excellent surface properties as described later, it is difficult for cracks to occur in a tensile test at high temperatures, and the elongation at high temperatures is high. This is one of the features.
- the elongation at 200 ° C. is 10% or more, preferably 40% or more.
- the elongation at room temperature of the cast coil material of the present invention after being wound is low as described above. There is no problem even if it exists.
- the coil material of the present invention is preferably a high-strength material satisfying a tensile strength at room temperature (about 20 ° C.) of 250 MPa or more in addition to the above-mentioned definition of elongation.
- the tensile strength of the cast coil material mainly varies depending on the composition. Depending on the type and content of the additive element, for example, the tensile strength at room temperature can satisfy 280 MPa or more.
- the cast coil material of the present invention includes t / In this state, a surface strain represented by Rmin is applied.
- the cast coil material of the present invention is manufactured under specific manufacturing conditions as described above, and thus has a form in which a large surface strain is imparted, for example, a form satisfying t / Rmin ⁇ 0.02, or t / Rmin. It can be set as the form which satisfy
- fills> 0.025.
- the coil material of the present invention is a form in which a thin plate material having a thickness t of 7 mm or less is wound in a cylindrical shape.
- This cast coil material is manufactured by the manufacturing method of the present invention that controls the temperature of the plate-like material immediately before winding as described above, so that the entire length including the winding start point gripped by the chuck portion of the winder Over the surface, the surface is substantially free from discoloration due to cracking or oxidation, and the surface properties are excellent.
- the precipitate particles existing inside are fine (average particle size: 50 ⁇ m or less), and have a depth of 100 ⁇ m or more and a width of 100 ⁇ m or less on the surface, and the longitudinal direction of the coil material.
- the oxide film is very thin or substantially non-existent, and quantitatively, the maximum thickness of the oxide film is 0.1 mm or less, preferably 10 ⁇ m or less, more preferably 1 ⁇ m or less. Is mentioned. The thinner the oxide film present on the surface of the cast coil material, the better the surface properties. Therefore, as long as the maximum thickness satisfies the above range, the overall thickness may not be uniform.
- plate material is an average thickness when taking thickness in the direction (width direction in a cast coil material) orthogonal to a longitudinal direction in the arbitrary points of a longitudinal direction. Say it.
- the winding start location gripped by the chuck portion of the winder is not used for post-processing as a discard dimension, and if there is no crack over the entire length of the plate-like material other than this winding start location, the winding start location Very fine wrinkles and grip wrinkles are allowed to occur.
- the length of the plate material constituting the coil material of the present invention is preferably 30 m or more.
- a more preferable length of the cast material is 50 m or more, and a particularly preferable length is 100 m or more.
- the length of the cast material is 30 m or more, many magnesium alloy members can be manufactured with one coil material.
- the fact that a large number of magnesium alloy members can be produced with a single coil material means that a single coil material prepared at the site where the magnesium alloy member is produced may be sufficient. In that case, it is possible to save the space for placing the coil material on site, improve the productivity of the magnesium alloy member, and greatly reduce the manufacturing cost of the magnesium alloy member.
- the magnesium alloy plate material of the present invention is a thin plate material having a thickness of 7 mm or less by being manufactured using the coil material of the present invention as a raw material.
- the cast coil material was cut into a predetermined shape, length, etc., the cast coil material was subjected to a surface treatment such as anti-corrosion treatment such as polishing, chemical conversion treatment or anodizing treatment, and painting.
- a surface treatment such as anti-corrosion treatment such as polishing, chemical conversion treatment or anodizing treatment, and painting.
- Form, form in which the cast coil material is subjected to heat treatment form in which the cast coil material is subjected to plastic processing such as rolling, and the cast coil material are combined with the above cutting, surface treatment, heat treatment, plastic processing, etc. (For example, a form in which cutting, heat treatment, plastic working, and surface treatment are performed).
- the coil material of the present invention has high strength and excellent surface properties as described above, it can be expected that it can be sufficiently used as a magnesium alloy plate material even in the form of being simply cut as described above.
- the surface treatment it is possible to obtain a magnesium alloy sheet that is further excellent in surface properties and corrosion resistance, and the commercial value is increased.
- surface treatment such as polishing and plastic working such as rolling, a magnesium alloy plate material thinner than the thickness of the coil material of the present invention used for the material can be obtained.
- the magnesium alloy sheet material subjected to the plastic working is further excellent in strength and rigidity than the cast coil material by work hardening.
- plate material is substantially the same thickness as this invention coil material used for the raw material.
- the magnesium alloy plate material of the present invention can be used as a magnesium alloy member as it is, or as a material for producing a magnesium alloy member obtained by subjecting this plate material to plastic working such as bending or drawing. You can also
- the coil material of the present invention is manufactured by winding a plate-shaped material manufactured by supplying a magnesium alloy in a molten state to a continuous casting machine using a winder. At that time, a cast coil material is obtained by controlling the temperature immediately before winding the plate-like material.
- the continuous casting method can be rapidly solidified, segregation and oxides can be reduced even when the content of the additive element is large, and a cast material excellent in plastic workability such as rolling can be obtained.
- a twin roll casting method there are various methods such as a twin roll casting method, a twin belt casting method, and a belt and wheel casting method, but the twin roll casting method and the twin belt casting method are suitable for producing a plate-like material.
- the twin roll casting method is particularly preferable because it can be rapidly solidified using a mold having excellent rigidity and thermal conductivity and a large heat capacity.
- center line segregation may be generated, but the region where the center line segregation exists is the thickness of the cast material. It has been confirmed that there is no problem when used for the material of the magnesium alloy member described above within the range of ⁇ 20% from the center in the vertical direction, particularly within the range of ⁇ 10%.
- the thickness of the plate-like material to be cast is 7 mm or less because segregation is likely to occur if it is too thick. In particular, it is preferable that the thickness is 5 mm or less because segregation can be sufficiently reduced.
- the lower limit of the thickness of the plate-like material is about 1 mm, more preferably about 2 mm, and still more preferably about 4 mm.
- the temperature of the plate-like material immediately after being discharged from the continuous casting machine is 350 ° C. or less.
- the temperature of the plate-like material immediately after being discharged from the continuous casting machine is 350 ° C. or less.
- the time for the molten metal to contact the mold hereinafter referred to as mold contact time
- the mold cooling temperature are adjusted, and the continuous casting machine
- a forced cooling means may be disposed at a position close to the downstream side.
- the temperature of the plate material in the range from the discharge port of the continuous caster to 500 mm, particularly 150 mm, in the traveling direction of the plate material is 350 ° C. or less, preferably 250 ° C. or less. It is desirable to perform casting so that By casting so as to be 350 ° C. or less, preferably 250 ° C. or less substantially immediately after being discharged from the continuous casting machine, it is possible to suppress excessive generation of crystallized products and growth of crystallized products, It is possible to reduce coarse crystallized substances that are the starting points of cracks and the like. Furthermore, in this case, the thickness of the oxide film naturally formed on the surface of the cast material can be reduced to 1 ⁇ m or less, and a cast material having excellent surface properties can be obtained without removing the oxide film in a subsequent process. .
- the lower the temperature of the plate material immediately after being discharged from the continuous casting machine the more preferable it is in terms of suppressing the generation of segregation and the growth of particles constituting the structure.
- the temperature of the plate-like material in the range of 500 mm, particularly 150 mm from the discharge port achieves 150 ° C. or less in the range.
- the lower limit of the temperature of the plate-like material immediately after casting is preferably room temperature or higher, preferably 80 ° C.
- the temperature of the plate-like material immediately before winding when controlling the temperature of the plate-like material immediately before winding by maintaining the temperature without heating the plate-like material discharged from the continuous casting machine, immediately after casting so as not to fall below the predetermined temperature just before winding.
- the temperature of the plate material is adjusted so that it is not too low.
- the temperature may be 150 ° C. or higher, particularly 200 ° C. or higher, and lower than the temperature of the plate-like material immediately after casting.
- the plate-like material obtained by the above casting is adjusted in temperature between the casting machine and the winder to control the temperature of the plate-like material immediately before winding.
- the temperature T (° C.) of the plate-like material immediately before winding is the surface strain ((t / R) ⁇ 100) represented by the thickness t of the plate-like material and the bending radius R (mm).
- the temperature is set to be not more than the elongation el r (%) of the plate material at T (° C.), preferably not more than the elongation el r (%) of the plate material at room temperature.
- the generation of cracks accompanying the winding of the plate-like material is caused mainly by the fact that the surface distortion generated in the plate-like material exceeds the elongation of the plate-like material.
- the elongation of the plate material increases as the temperature increases. Therefore, if the temperature of the plate-like material immediately before winding is controlled as described above, it is possible to obtain a cast coil material that is hardly cracked or has no cracks.
- the surface distortion is relatively large, for example, when t / R ⁇ 0.01, it is effective to control the temperature of the plate-like material immediately before winding.
- the minimum bending radius Rmin is 500 mm or less, more preferably 400 mm or less, still more preferably 300 mm or less, especially 250 mm or less.
- the temperature control is performed by adjusting the temperature immediately before winding by adjusting the temperature of the plate-like material after casting to a predetermined temperature or less and then heating it. There is a case where the temperature drop of the plate-like material from the casting machine to the winder is suppressed by adjusting the heat retention or cooling time without performing heating.
- the plate-like material immediately before winding is controlled by heating, it is preferable that the plate-like material is once cooled to 150 ° C. or less between the continuous casting machine and the heating device that performs the heating.
- this cooling in-line for example, the distance from the discharge port of the continuous casting machine (in the case of a twin roll casting machine, the point where it is not sandwiched between a pair of rolls) to the heating point described later, the mold contact time, the mold It is possible to adjust the cooling temperature of the product and let it cool naturally.
- a forced cooling means is arrange
- the plate-like material is heated to control the temperature of the plate-like material immediately before winding to a predetermined temperature described later.
- An appropriate heating means can be used for this heating.
- the heating means may be, for example, an atmosphere furnace that fills and circulates a heated gas in the furnace, an induction heating furnace, a direct current heating furnace that directly energizes the plate-like material, a radiant heating device, a commercially available electric heater, or other high temperature And an immersion apparatus using a high-temperature liquid that is heated by being immersed in a liquid such as oil.
- the heating temperature is preferably 350 ° C. or lower because deformation may occur. Note that when the heating temperature is higher than 350 ° C., it is preferable to perform heating in an atmosphere having a low oxygen concentration because oxidation can be prevented.
- the oxygen concentration in the atmosphere at this time is preferably less than 10% by volume. However, even in an atmosphere with a low oxygen concentration, if the heating temperature is too high, problems such as the growth of precipitates may occur as described above. Therefore, the heating temperature is preferably 400 ° C. or lower.
- the plate-shaped material after casting is not heated and the temperature drop of the plate-shaped material from the casting machine to the winder is suppressed, at least a part of the space between the continuous casting machine and the winder is required.
- the plate material may be surrounded by a heat insulating material (heat insulating material).
- the temperature of the plate-like material immediately after being discharged from the continuous casting machine is adjusted to a relatively high temperature in the range of 350 ° C. or less so that the temperature of the plate-like material does not greatly decrease just before winding. It is preferable to do.
- the magnesium alloy has higher elongation (breaking elongation) as the temperature is increased.
- FIG. 5 shows the relationship between the test temperature (° C.) and the elongation at break (%) when a tensile test was performed on the twin roll cast material of AZ91 alloy.
- the twin roll cast material of the AZ91 alloy has a high elongation by increasing the temperature even if the elongation at room temperature is small.
- the thickness t of the plate-like material is large and the bending radius Rb is small, the surface strain t / Rb exceeds the room temperature elongation (2.3%) shown in FIG. 5 as shown in Table 1. . Therefore, in this case, it is found that it is difficult to wind up at room temperature due to cracks or the like. Therefore, in the manufacturing method of the present invention, the temperature of the plate material before winding is appropriately controlled as described above.
- the plate-shaped member, and its thickness t since the surface strain t / R b corresponding to the radius R b bending is applied, the temperature of the plate material just before coiling, the It can be said that it is preferable to set according to the surface distortion.
- this temperature T (degreeC) ) Is proposed to control the temperature of the plate material so that the following equation (1) is satisfied.
- t / Rmin is a range where T can take a real number.
- the temperature T (° C.) immediately before winding is set to 150 ° C. or more when the surface strain is large, specifically when t / Rmin> 0.01, and specifically when the surface strain is relatively small.
- the temperature is 120 ° C. or higher.
- the surface strain is small, specifically, when t / Rmin ⁇ 0.008, 100 ° C. or higher is preferable. .
- the temperature T (° C.) immediately before winding the plate-like material is controlled from the winding start point of the plate-like material (typically, the point gripped by the chuck portion provided in the winder) to the winding end point. It is performed on a portion where a bending that does not satisfy the allowable bending radius at room temperature of the plate-like material is applied to the entire length. That is, temperature control may be performed on the entire length from the winding start position to the winding end position of the plate-like material, or temperature control may be performed on only a part thereof.
- the winding radius increases as the number of winding layers increases.
- the temperature immediately before winding of the plate-like material may be controlled from the winding start position to the middle, and may be wound at room temperature without being controlled after the middle.
- the temperature may be controlled only at a location gripped by the chuck portion.
- temperature control may be performed over the entire length from the winding start point to the winding end point.
- the plate material can be wound with a sufficiently high elongation, which can more effectively suppress the occurrence of cracks and the like. it can.
- the control temperature from the winding start position to the middle may be different from the control temperature after the middle, or the same control temperature may be used over the entire length.
- the winding machine of the present invention is a coil material winding machine for winding a plate-like material continuously produced by a continuous casting machine into a cylindrical shape, and a chuck portion for holding an end of the plate-like material And a heating means for heating a region gripped by the chuck portion in the plate-like material.
- a heating means is provided so that the winding start portion is sufficiently heated and then gripped by the chuck portion.
- This heating means can be easily used by an electric heater or the like.
- the wiring of a heating means may be twisted by rotation of a winding drum, it is preferable to utilize a sliding contact etc.
- the heating by the heating means provided in the winder and the heating by the heating means disposed between the continuous casting machine and the winder may be used in combination.
- the cast coil material obtained by the manufacturing method of the present invention is excellent in surface properties as described above, for example, the cast coil material is prepared, and t ⁇ 90 with respect to the thickness t of the cast coil material.
- the magnesium alloy sheet material of the present invention can be produced using a portion of% or more. More specifically, the magnesium alloy plate material is manufactured by performing cutting or the like as appropriate after performing a simple polishing process that requires little removal by polishing without performing a process such as polishing. can do. In this way, by using the cast coil material of the present invention, a magnesium alloy plate material having excellent surface properties can be produced with high productivity.
- This magnesium alloy sheet has the same thickness, the same strength and toughness as the cast coil material.
- the magnesium alloy sheet of the present invention can be manufactured by preparing the cast coil material and rolling the cast coil material with a reduction rate of less than 20%.
- the cast coil material can be rolled as it is without being subjected to heat treatment or the like in advance.
- the manufactured magnesium alloy sheet material is plastic-cured and has higher strength than the cast coil material as described above. Therefore, by using the cast coil material of the present invention, a stronger magnesium alloy sheet can be manufactured with high productivity.
- cracking and the like are unlikely to occur when the material is heated to 300 ° C. or lower, particularly 150 ° C. or higher and 280 ° C. or lower.
- rolling reduction the thickness of the pre-rolling stock t 0, when the thickness of the rolled sheet after rolling and t 1, is represented by ⁇ (t 0 -t 1) / t 0 ⁇ ⁇ 100 It is a value and in this specification refers to the total rolling reduction.
- the magnesium alloy sheet of the present invention can be manufactured by performing a heat treatment at a heat treatment temperature Tan (K) for a holding time of 30 minutes or more.
- Heat treatment temperature Tan preferably satisfies Ts ⁇ 0.80K or more and Ts ⁇ 0.90K or less because a magnesium alloy material having excellent toughness can be obtained.
- the holding time is more preferably 1 hour to 20 hours, and the holding time is preferably longer as the content of the additive element is higher.
- This heat treatment typically corresponds to a solution treatment, and can homogenize the composition and re-dissolve the precipitates to enhance toughness.
- the concentrated phase of the additive element can be diffused to some extent at the crystal interface constituting the cast structure. Thereby, the improvement effect of toughness is acquired. Therefore, by using the cast coil material of the present invention and performing the specific heat treatment, a magnesium alloy plate material having better toughness can be produced with high productivity. Note that in the step of cooling from the holding time, it is preferable to increase the cooling rate by using forced cooling such as water cooling or blast, which can suppress the precipitation of coarse precipitates.
- the plate subjected to the above heat treatment has improved toughness, it can be rolled with a larger reduction ratio (total reduction ratio), for example. That is, a higher strength magnesium alloy sheet can be produced with high productivity by rolling at a reduction rate of 20% or more after the heat treatment.
- the rolling reduction can be selected as appropriate. By rolling a plurality of times (multi-pass), a thinner plate can be obtained, and the average crystal grain size of the plate can be reduced to improve plastic workability such as press working.
- an intermediate heat treatment is performed between passes, and the strain, residual stress, texture, etc. introduced into the material by plastic working (mainly rolling) up to the intermediate heat treatment are removed and reduced. Rolling can be performed more smoothly by preventing inadvertent cracking, distortion and deformation during rolling.
- Examples of the intermediate heat treatment include heating temperature: 150 ° C. to 350 ° C., holding time: 0.5 hour to 3 hours.
- the plate material (rolled plate) subjected to the above rolling is subjected to final heat treatment (final annealing) or subjected to warm correction, plastic workability such as press working can be improved. Therefore, the plate material is subjected to the above plastic working. It is preferable when used as a material. Furthermore, heat treatment can be performed after the plastic working to remove distortion and residual stress introduced by the plastic working and improve mechanical characteristics. In addition, after the rolling, after the final heat treatment, after the warm correction, after the plastic processing, or after the heat treatment after the plastic processing, it is subjected to polishing, anticorrosion treatment, painting, etc. Can be further improved, mechanical protection can be achieved, and the commercial value can be increased.
- a molten magnesium alloy was prepared, and continuous casting was performed by a continuous casting machine 110 as shown in FIG. 1A, and the distance t between a pair of rolls as molds was adjusted to obtain a thickness t shown in Table 2.
- the plate material 1 is manufactured, and the plate material 1 is wound into a cylindrical shape by a winder 120 installed downstream of the continuous casting machine 110 to form a cast coil material.
- a magnesium alloy based on the ASTM standard, a composition equivalent to AZ91D alloy (Mg-9.0% Al-1.0% Zn, satisfying formula value D ⁇ 14.5), a composition equivalent to AZ31B alloy (Mg -3.0% Al-1.0% Zn), composition equivalent to AS42 alloy (Mg-4.0% Al-1.6% Si), composition equivalent to AX52 alloy (Mg-5.0% Al-1) (7% Ca) was prepared (all added elements were mass%). Each alloy was prepared so that a plate-like material having a total length of 50 m could be produced at any thickness t. Furthermore, a twin roll casting machine is used here as the continuous casting machine 110.
- the continuous casting machine 110 has a water-cooled movable mold (roll) and can rapidly cool and solidify the molten metal.
- the pair of rolls are rotated by a rotation mechanism (not shown).
- the winding machine 120 includes a winding drum 121 and a rotation mechanism (not shown) that rotates the winding drum 121, and the plate-like material 1 that is continuously cast by rotating the winding drum 121. Is moved to the winder 120 side, and finally the plate material 1 is wound up.
- the time for the molten metal to contact the roll is adjusted so that the temperature in the range A from the discharge port of the continuous casting machine 110 to 150 mm in the traveling direction of the plate-like material 1 is 140 to 150 ° C.
- the roll cooling temperature was adjusted. That is, the plate-like material 1 was cooled by natural cooling. And the heating means 130 is arrange
- the plate-like material 1 was heated so as to have the temperature shown in FIG. (Here, 100 ° C., 120 ° C., 150 ° C., 200 ° C.).
- the heating means 130 a commercially available electric heater was used.
- the heating temperature is determined by measuring the temperature of the plate-like material 1 during heating and immediately after heating with a thermometer (not shown) so that the plate-like material 1 is not burned or oxidized.
- the surface temperature of the plate-like material 1 just before being wound by the machine 120 was measured with a thermometer 125, and the heating means 130 was adjusted so that the measured temperature became the temperature shown in Table 2.
- the thermometer 125 a commercially available non-contact thermometer was used.
- the winding drum 121 of the winder 120 is prepared with various radii, and the plate material 1 is wound with the radius of the winding drum as the minimum bending radius Rmin.
- the surface state of the wound cast coil material was examined. The results are shown in Table 2 and FIG. In Table 2 and FIG. 2, ⁇ indicates that the plate-like material was broken or could not be wound up many times, and ⁇ was able to be wound up, but a crack was observed on a part of the surface. , ⁇ indicates that it was able to be wound up substantially without cracks over the entire length. The presence or absence of cracks was confirmed visually.
- the heating temperature T is such that when the surface strain is t / Rmin> 0.01: 150 ° C. or higher, 0.008 ⁇ t / Rmin ⁇ 0.01: 120 ° C. or higher, t / Rmin ⁇ 0.008 Case: It is understood that 100 ° C. or higher is preferable.
- the heating temperature T is increased, a cast coil material having excellent surface properties can be produced without causing cracks and the like. Therefore, when the heating temperature T was further increased, when the temperature exceeded 350 ° C., discoloration of the surface was remarkable. Therefore, it can be said that the heating temperature T is preferably 350 ° C. or lower.
- Test Example 1-2 When producing a cast coil material in the same manner as in Test Example 1-1, the heating temperature at which winding was possible without causing cracks was investigated when the surface strain was large. The results are shown in Table 3 and FIG.
- FIG. 4A shows an example of the chuck portion.
- the chuck portion 122 has a pair of gripping pieces 122a and 122b that sandwich the winding start position of the plate-like material 1.
- One gripping piece 122a is compatible with the convex portion 123a
- the other gripping piece 122b is compatible with the convex portion 123a.
- Each of the concave portions 123b is provided.
- the plate-like material 1 By inserting the plate-like material 1 between the convex portion 123a and the concave portion 123b, meshing the convex portion 123a and the concave portion 123b, and applying a predetermined pressure, the plate-like material 1 is formed with the convex portion 123a and the concave portion 123b. Is bent so as to be firmly held by the convex portion 123a and the concave portion 123b. Then, as shown in FIG. 4B, the plate-like material 1 is subjected to bending substantially along the shapes of the convex portions 123a and the concave portions 123b.
- the winder 120 is heated so that the region where the plate-like material 1 is gripped by the chuck portion (not shown) can be heated.
- a heating unit 131 provided with a winding drum 121 for heating the above-described region is used.
- the surface temperature of the plate-like material 1 immediately before being taken up by the winder 120 is measured by the thermometer 125, and the region (winding) of the plate-like material 1 held by the chuck portion is measured.
- the heating temperature at which the first part) can be wound up without breaking was measured.
- the radius of the winding drum was 600 mm.
- the relationship between the surface strain t / Rmin and the heating temperature T was examined.
- the surface strain t // was measured using samples excluding the sample Nos. 2-5, 2-8, 2-9, 2-11, 2-12, and 2-14 that had prominent values.
- the heating temperature T preferably satisfies the above-described formula (1-1), and more preferably satisfies the above-described formula (2-1).
- Test Example 1-3 Using the magnesium alloy cast coil material obtained in Test Example 1-1, a magnesium alloy sheet was produced.
- Sample No. 3-15 had a dent having a depth of less than 0.1 mm on the surface of the cast material before winding. When the cast material was heated up as described above and wound up and the surface after winding was examined, there was no change in the size of the recess before and after winding. Therefore, Sample No. 3-15 was subjected to belt polishing before rolling to remove the surface layer portion to remove the dent.
- the surface layer portions having a thickness of 0.15 mm and a total of 0.3 mm were removed from the front and back of the cast material.
- the thickness of the obtained magnesium alloy plate material is 3.7 mm, and the thickness of the magnesium alloy cast coil material: 90% or more of 4 mm is satisfied.
- the temperature of the plate-like material immediately before winding was 150 ° C. As a result, it was confirmed that even if the minimum bending radius Rmin is 300 mm, the plate-like material can be wound without cracking. Furthermore, the test was also performed on a plate-like material having a higher heat dissipation property because it is thinner and has a larger specific surface area. As a result, a plate-like material having a thickness of 3 mm and a width of 250 mm was kept warm so that the temperature immediately before winding was 150 ° C., and as a result, the plate-like material was not cracked even when the minimum bending radius Rmin was 200 mm. I confirmed that it could be rolled up.
- Embodiment 2-1 it can be suitably used when casting and winding a plate-like material in the embodiment 1-1 and other embodiments described later, and of course, regardless of the presence or absence of the prescribed conditions in these embodiments.
- a method for producing a magnesium alloy cast coil material applicable to the production of a magnesium alloy cast coil material and a magnesium alloy cast coil material obtained by the method will be described. According to this technique, it is possible to obtain a magnesium alloy cast coil material that is wound so that a gap is not easily formed between the turns of the coil material.
- the present inventors have made the magnesium alloy cast coil material obtained by winding the cast material into secondary processing such as rolling and polishing. It has been found that not only the quality of the cast material itself but also the shape and form of the coil material are important.
- a gap is formed between the turns of the coil material, for example, when the coil material is further solution-treated and water-cooled, cooling water enters the gap and partial corrosion or Discoloration may occur.
- the present inventors have conducted various studies. As a result, in producing a magnesium alloy cast coil material, the temperature distribution in the width direction of the cast material immediately before winding and the winding tension are in an appropriate range. As a result, it was found that it was difficult to form a gap between the turns of the produced magnesium alloy cast coil material. Based on this knowledge, the following magnesium alloy cast coil material and its manufacturing method are defined.
- This magnesium alloy cast coil material is formed by winding a long cast material made of a magnesium alloy, from a straight line circumscribing both end faces of the coiled cast material to the outer peripheral surface of the coiled cast material. Of these distances, when d is the farthest distance and w is the width of the cast material, 0.0001w ⁇ d ⁇ 0.01w is satisfied. And the outer peripheral surface of a coil-shaped casting material is located in the core part side of a coil-shaped casting material rather than the said straight line.
- This magnesium alloy cast coil material has a drum-like shape with a recessed middle portion in the width direction, but the recess is a magnesium alloy cast coil material limited to the above range.
- the recess in the intermediate portion in the width direction of the magnesium alloy cast coil material is in the above range, the coil material is strongly wound, and the gap formed between the turns of the coil material Became very small.
- the casting material can be stably supplied to the secondary processing step, so that secondary processing with excellent quality is possible. Product can be made.
- this magnesium alloy cast coil material is solution-treated and then cooled with water, it is difficult for cooling water to enter the gaps between the turns of the coil material, so that the magnesium alloy cast coil material is partially corroded due to the cooling water. Can be suppressed.
- the steel strip for preventing coil unwinding is difficult to come off from the coil material, and therefore when the coil material is subjected to secondary processing. And it is very easy to handle when shipping to customers.
- the gap between turns in the magnesium alloy cast coil material is preferably 1 mm or less.
- the fact that the gap between the turns is small means that the flatness of the cast material constituting the coil material is high (that is, there is little variation in the thickness of the cast material). Therefore, when the cast material obtained by rewinding the coil material is subjected to secondary processing, an excellent quality secondary processed product can be manufactured.
- a more preferable value of the gap is 0.5 mm or less.
- the variation in the thickness of the cast material constituting the magnesium alloy cast coil material is ⁇ 0.2 mm or less.
- the variation in the plate thickness may be obtained, for example, from the result of measuring at least 10 points with a predetermined interval (for example, every 10 m) in the longitudinal direction of the cast material.
- Each measurement point in the longitudinal direction is preferably obtained by averaging the results of measuring the plate thickness at least at three locations in the width direction on both edges and the middle portion of the cast material.
- a center sensor that measures the thickness of the intermediate portion in the width direction of the cast material and a pair of side sensors that respectively measure the thickness of both edges in the width direction of the cast material are arranged on a straight line in the width direction.
- the thickness of three places in the width direction of the cast material every 10 m is measured, and the average is obtained. And when the average thickness of the cast material for every 10 m is compared, the variation in plate thickness may be ⁇ 0.2 mm.
- the thickness variation in the width direction of the cast material is preferably ⁇ 0.05 mm or less.
- the position measured by the side sensor is at least 20 mm inside from the side edge of the cast material.
- the small variation in the thickness of the cast material in the coil material is synonymous with the fact that the cast material has less irregularities, and therefore it can be said that the flatness of the cast material in the coil material is high. That is, it can be said that the gap formed between the turns is very small in the magnesium alloy cast coil material formed by winding a cast material with a small variation in plate thickness.
- the same composition, mechanical characteristics, and form as those of the plate-like material in Embodiment 1-1 can be used.
- the magnesium alloy cast coil material mentioned above can be manufactured by the manufacturing method of the magnesium alloy cast coil material shown below.
- This magnesium alloy cast coil material is produced by continuously producing a plate-like cast material made of a magnesium alloy by a continuous casting machine, and winding the produced plate-like cast material into a cylindrical shape to produce a magnesium alloy cast coil.
- the temperature of the casting material is set so that the variation in the temperature in the width direction of the cast material immediately before winding is within 50 ° C., and the temperature of the intermediate portion in the width direction of the cast material is higher than the temperature of both edges. Control.
- the cast material is wound up by applying a winding tension of 300 kgf / cm 2 or more.
- the temperature of both edges in the width direction of the cast material is a measurement result at a position 20 mm or more closer to the middle in the width direction from the side edge of the cast material. This is because the side edges of the cast material have large temperature fluctuations.
- the both edge parts can be easily cooled before the intermediate part, and the resulting magnesium alloy casting
- the coil material tends to have a drum shape with a concave middle portion in the width direction.
- the temperature difference is within 50 ° C., and the winding tension when winding the cast material is constant at 300 kgf / cm 2 or more. So that both edges of the wound cast material do not warp excessively in the outer circumferential direction of the coil material, and it is difficult to form a non-uniform gap in the width direction of the coil material between the turns of the magnesium alloy cast coil material that is completed. It can be tightened strongly.
- a more preferable temperature difference is within 15 ° C.
- a magnesium alloy cast coil material even if it is a magnesium alloy cast coil material formed by winding up a cast material of 30 m or more, a gap is not easily formed between the turns of the coil material. According to the manufacturing method, a cast material of 100 m or more can be wound in a coil shape.
- the first is to control the cooling temperature when a plate-shaped cast material is produced from the molten metal with a continuous casting machine.
- a continuous casting machine is a twin roll type continuous casting apparatus
- the temperature of the casting roll may be adjusted, or the casting speed and the temperature of the molten metal may be adjusted.
- the second is to control the natural cooling of the cast material from the continuous caster to the winder. For example, shortening the section from the continuous casting machine to the winder or increasing the sealing property and heat retention of the section. Usually, since both edges in the width direction of the cast material are easily cooled, it is preferable to reduce the cooling of both edges.
- the third is to heat the cast material again before being wound on the winder. If it is reheating, the temperature of the cast material in the width direction can be easily controlled. This reheating also contributes to making the ASTM-based AZ91 alloy having high rigidity easy to wind.
- the winding tension in the method of manufacturing the magnesium alloy cast coil material may be appropriately selected depending on the cross-sectional area of the cast material to be wound, but it is preferable to set the winding tension to be generally high.
- the winding tension is preferably constant at 450 kgf / cm 2 or more.
- the winding tension is 125 [kgf / (cm 2 ⁇ cm 2 )] ⁇ S (cm 2 : breakage of the casting material. Area) or less.
- both the temperature of the intermediate part in the width direction and the temperature of both edges of the cast material just before winding at 150 ° C. to 350 ° C.
- the cast material can be easily wound regardless of the composition of the cast material. For example, even a cast material made of AZ91 alloy having high rigidity can be wound without causing cracks.
- the quality of the wound casting material in the longitudinal direction can be stabilized by reducing the temperature variation in the longitudinal direction of the casting material.
- the longitudinal temperature variation in the cast material is within 50 ° C.
- the winding tension acting on the cast material can be stabilized throughout the winding operation.
- this magnesium alloy cast coil material it is preferable to start the measurement of the temperature of the cast material immediately before winding from the position 10 m from the winding end (winding start end) of the cast material. . This is because the cast material up to 10 m from the winding end lacks temperature stability, and it is difficult to reduce the temperature variation of the cast material.
- Embodiment 2-2 >> Next, with reference to FIG. 6A, FIG. 6B, and FIG. 7, the drum-shaped magnesium alloy cast coil material and the manufacturing method thereof will be described more specifically.
- This embodiment can also be used in combination with other embodiments.
- a cast material made of a magnesium alloy is produced, and a magnesium alloy cast coil material obtained by winding the cast material into a coil shape based on the above-described production method of the magnesium alloy cast coil material or a conventional production method is produced.
- a melt 1A ′ of a magnesium alloy (Mg-9.0 mass% Al-1.0 mass% Zn) equivalent to AZ91D according to the ASTM standard is prepared, and a twin roll type continuous casting machine as shown in FIGS. 6A and 6B. 210 was continuously cast to produce a plate-like cast material 1A.
- the produced cast material 1A is wound into a cylindrical shape by a winder 220 installed downstream of the caster 210 to become a magnesium alloy cast coil material 2.
- the twin-roll continuous casting machine 210 used in this embodiment includes a pair of water-cooled casting rolls 211 and 211 and a casting nozzle 212 that supplies molten metal 1A ′ between the two rolls 211 and 211.
- the molten metal 1A ′ supplied from the casting nozzle 212 is rapidly cooled and solidified by the water-cooled casting rolls 211 and 211, so that a plate-like casting material 1A with little segregation can be produced.
- the cast material 1A of various thickness can be produced by adjusting the space
- the width of the cast material 1A to be produced is mainly defined by the width of the side weir of the casting nozzle 212 inserted into the casting rolls 211 and 211. Further, the plate thickness of the cast material 1A mainly adjusts the interval between the opposing casting rolls 211 and 211 and the rotational speed of the casting rolls 211 and 211, and fluctuates the rotational speed of the winding drum 221 of the winder 220, It is defined by adjusting the tension acting on the cast material 1A. Variations in the thickness of the cast material 1A are affected by the rotational speed, shape, temperature, and other tensions acting on the cast material 1A.
- the variation in the thickness of the cast material 1A is reduced by adjusting the rotation speed of the casting rolls 211 and 211 and the tension acting on the cast material 1A.
- the plate thickness and its variation are measured by measuring the stress applied to the cast material 1A by the casting rolls 211 and 211, and depending on the stress, the rotational speed of the casting rolls 211 and 211 and the tension acting on the cast material 1A are determined. It may be adjusted so as to be substantially constant during the winding of 1A.
- the heating means 230 that can reheat the cast material 1 ⁇ / b> A before being wound by the winder 220 is disposed and immediately before being wound by the winder 220.
- Non-contact-type thermometers 240, 240, and 240 that can measure surface temperatures at three locations in the width direction intermediate portion and both edge portions of the cast material 1A are arranged.
- the center thermometer 240 is disposed at the center in the width direction of the cast material 1A, and the thermometers 240 and 240 on both sides are disposed 20 mm inside from the side edge of the cast material 1A.
- the heating means 230 can change the heating temperature in the width direction of the cast material 1A and can change the temperature in the width direction of the cast material 1A.
- Example 2-1 A plurality of coil materials 2 (samples 4-1 to 4-9 in Table 5) in which the casting material 1A is continuously produced by the coil material manufacturing facility described above and the casting material 1A is wound in a coil shape.
- the dimensions of the cast material 1A in each sample are all the same (length 200 m, average width 300 mm, average plate thickness 5 mm, plate thickness variation ⁇ 0.3 mm or less), and the number of turns (45 turns) of the coil material 2 is also the same. It was. Further, the winding tension of the cast material 1A was also made constant at about 400 kgf / cm 2 by adjusting the rotational speed of the winding drum 221 of the winding machine 210.
- the plate thickness of the cast material 1A was obtained by averaging a plurality of measurement results measured with a non-contact type measuring device arranged in the vicinity of the exits of the casting rolls 211 and 211.
- the measurement of the numerical value was performed every 10 m from the position of 10 m from the winding end in the casting material 1 ⁇ / b> A to the end of winding at the three places in the width direction intermediate portion and both edge portions in the casting material 1 ⁇ / b> A.
- the measurement position of the thickness of the cast material 1A is 20 mm from the center in the width direction of the cast material 1A and the side edge of the cast material 1A, similarly to the measurement position of the temperature of the cast material 1A.
- the temperature in the width direction of the cast material 1A immediately before winding was changed by switching the heating means 230 on and off.
- On / off adjustment of the heating means 230 is performed continuously (or intermittently in the longitudinal direction of the cast material 1A) from the time when the thermometer 240, 240, 240 is made 10 m from the winding end of the cast material 1A. )) Was performed based on the surface temperature of the cast material 1A measured.
- the temperature in the width direction of the cast material 1A in Table 5 is an average value of the surface temperature of the cast material 1A measured from the time when the cast material 1A is made 10 m from the winding end to the end of winding.
- the temperature of both edge parts in Table 5 is an average value of the left and right end part temperatures.
- the index d (mm) of the dent in the intermediate portion in the width direction of the magnesium alloy cast coil material 2 is a straight line circumscribing both end faces of the produced magnesium alloy cast coil material 2 (as shown in FIG. 7). The distance farthest from the distance from the straight line parallel to the axis) to the outer peripheral surface of the coil material 2 was determined by measuring with a commercially available gap gauge.
- the temperature of the intermediate part in the width direction of the cast material immediately before winding is higher than the temperature of both edge parts, and the temperature difference between the intermediate part and both edge parts is 50 ° C. or less.
- the coil material produced so as to have a drum shape with a concave middle portion in the width direction.
- the indentation d of the coil material thus produced was out of the range of 0.03 mm to 3 mm.
- Embodiment 3-1 When the plate-like material is cast and wound in the above embodiments 1-1 to 2-2 and other embodiments described later, magnesium is widely used regardless of the presence or absence of the prescribed conditions in these embodiments.
- a method for producing a magnesium alloy cast coil material that can be suitably applied to the production of an alloy cast coil material, and a magnesium alloy cast coil material obtained by the method will be described. According to this technique, a plate-like material having an irregular cross-sectional shape can be obtained by setting the nozzle used for casting to a specific shape.
- This method of manufacturing a magnesium alloy cast coil material includes a step of supplying a molten magnesium alloy to a continuous casting machine to manufacture and wind a long cast plate. And the nozzle which supplies the said molten metal to the casting_mold
- This production method can produce, for example, a magnesium alloy cast coil material composed of a cast plate having the following specific cross-sectional shape.
- the magnesium alloy cast coil material is formed by winding a long cast plate made of a magnesium alloy, and in the cross section of the cast plate, the side surface of the cast plate has at least one curved portion, and The maximum protruding distance of the curved portion in the direction orthogonal to the thickness direction of the cast plate is 0.5 mm or more.
- the inner surface of the nozzle is not a flat surface over the entire surface.
- a nozzle is comprised so that it may become a shape which has a recessed part.
- a cast plate made of a magnesium alloy can be continuously and stably manufactured.
- a long cast plate having a length of 30 m or more, further 100 m or more, particularly 400 m or more is manufactured. It is possible to obtain a cast coil material having a length of 30 m or more by winding the cast plate. Moreover, this cast plate has few chippings or cracks at the edge, and can sufficiently secure a predetermined width. Therefore, according to this manufacturing method, the amount of trimming of the obtained cast plate can be reduced and the yield can be improved, and a coil material (typically, winding up such a long cast plate) Cast coil material) can be manufactured with high productivity.
- the coil material obtained by the above manufacturing method can be suitably used as a material for a magnesium alloy member. More specifically, primary plastic processing such as rolling is performed by unwinding the coil material, and various secondary processing such as polishing processing, leveler processing, and plastic processing (for example, press processing) is appropriately performed on the rolled plate.
- primary plastic processing such as rolling is performed by unwinding the coil material
- various secondary processing such as polishing processing, leveler processing, and plastic processing (for example, press processing) is appropriately performed on the rolled plate.
- the raw material can be continuously supplied to the processing apparatus. Therefore, the coil material and the cast coil material obtained by the manufacturing method can contribute to mass production of magnesium alloy members such as press-worked members.
- composition of the cast material to be the magnesium alloy cast coil material the same composition, mechanical characteristics, and form as those of the plate material in Embodiment 1-1 can be used.
- a pair of main body plates that are spaced apart from each other and a rectangular opening that is disposed so as to sandwich both edges of the main body plate and combined with the main body plate.
- the form comprised with a pair of prismatic side dam which forms a part is mentioned.
- a nozzle formed integrally with a uniform material can be used.
- the main body plate that mainly guides the molten metal that forms the front and back surfaces of the cast plate and the side dam that mainly guides the molten metal that forms the side surface of the cast plate are separate members.
- Various three-dimensional shapes can be easily configured when the materials are different or combined.
- At least the tip side region of the inner side surface in contact with the molten metal in the side dam protrudes from the central portion in the thickness direction of the nozzle and is recessed from the central portion toward the main body plate side.
- the shape is one mountain shape, and the maximum distance between the protruding portion and the concave portion is 0.5 mm or more.
- the shape of the inner side surface of the side dam can be various so that the side surface of the cast plate has a concave portion or a convex portion.
- the maximum distance is a specific size and is a single ridge protruding toward the inside of the nozzle
- the recess formed in the connection portion between the main body plate and the side dam has an rectangular opening. Since it is a narrow area
- the maximum distance between the protruding portion and the concave portion is 1 mm or more and 4 mm or less, and that the solidification in the nozzle described above can be easily suppressed.
- the lateral cross-sectional shape of the side surface of the obtained cast plate is recessed at the center in the thickness direction, and from this center to each surface of the cast plate It is an uneven shape that swells and dents. To put it simply, it is a shape in which two arcs are arranged or a two-peak shape in which two peaks are connected.
- the cross-sectional shape of the cast plate is an uneven shape in which three or more peaks are connected.
- At least the tip side region of the inner surface in contact with the molten metal in the side dam has an arc shape in which the central portion in the thickness direction of the nozzle is recessed,
- the form whose maximum distance with the string of a recessed part is 0.5 mm or more is mentioned.
- the shape of the nozzle opening is a shape (typically a racetrack shape) in which a pair of main body plates are connected by a smooth curve. Therefore, according to the said form, the local coagulation
- the maximum distance between the concave portion and the chord of the concave portion is 1 mm or more and 4 mm or less, so that the solidification in the nozzle described above can be easily suppressed.
- the lateral cross-sectional shape of the side surface of the obtained cast plate becomes a convex shape, typically a semicircular arc shape, protruding from the center in the thickness direction.
- the side dam has an inclined surface with a corner portion formed by an end surface on the nozzle tip side and an inner surface in contact with the molten metal, and the inclined surface. And the angle formed by the virtual extension surface of the inner surface is ⁇ , the ⁇ is 5 ° or more and 45 ° or less.
- the side dam is arranged so that the ridge line between the inclined surface and the inner side surface is located on the inner side of the front end edge of the main body plate.
- the vicinity of the opening of the nozzle has a tapered shape that spreads forward in the traveling direction of the molten metal.
- the vicinity of the molten metal outlet (nozzle opening) is tapered, so that the molten metal flowing along the inner surface is adjusted by adjusting the flow rate of the molten metal, and the inner surface of the side dam near the outlet.
- the above aspect it is possible to accurately and stably manufacture a cast plate having a size capable of sufficiently securing a predetermined plate width by reducing the chipping and cracking of the edge portion. Further, since the molten metal is not supported by the side dam in the vicinity of the outlet, the side surface of the formed cast plate tends to have a shape having at least one curved portion.
- ⁇ is less than 5 ° and more than 45 °, a solidified product is generated like the nozzle having the rectangular shape described above, and the edge is not easily cracked or cracked.
- ⁇ is more preferably 20 ° or more and 40 ° or less.
- the nozzle is guided to the nozzle outlet in a state where the molten metal is in contact with the side dam in the same manner as the nozzle having a rectangular opening. Therefore, the distance between the ridge line and the front edge of the main body plate is preferably 5 mm or less.
- the molten metal can be kept at a high temperature near the nozzle outlet and transferred to the mold as described above. Therefore, it is possible to more effectively prevent the occurrence of chipping and cracking at the edge.
- the magnesium alloy cast coil material characterized in the cross-sectional shape and the manufacturing method thereof will be described more specifically. 8B and 9B, only the left half is shown in the cross section of the casting nozzle, but the right half actually exists. Further, in FIGS. 8A and 8B to 10A and 10B, the shape in the thickness direction is shown highlighted so that the side surface shape of the cast plate and the inner side surface of the nozzle can be easily understood.
- the casting nozzle used in each of the following embodiments can be applied to the production of a magnesium alloy cast coil material regardless of the presence or absence of the conditions defined in the other embodiments as well as other embodiments.
- Embodiment 3-2 a magnesium alloy cast coil material according to Embodiment 3-2 and a method for manufacturing the same will be described.
- This magnesium alloy cast coil material (not shown) is obtained by winding a long cast plate 1B made of a magnesium alloy.
- This cast coil material is characterized by the cross-sectional shape of the cast plate 1B.
- the cast plate 1B has a concavo-convex side surface 310 in its cross section (showing the end face in FIG. 8A).
- the side surface 310 has a concave central portion in the thickness direction of the cast plate 1B and is once swollen from the central portion toward each surface 311 of the cast plate 1B. It has a double mountain shape with semicircular arcs.
- the maximum protrusion distance Wb in the direction orthogonal to the thickness direction of the cast plate 1B is 0.5 mm or more.
- the maximum protrusion distance Wb is a straight line in the thickness direction orthogonal to the surface 311 of the cast plate 1B, and in the concave portion of the side surface 310, in the straight line l 1 passing through the most concave point and in the convex portion of the side surface 310.
- the straight line l 2 passing through the most protruding point is taken, the distance between the straight lines l 1 and l 2 is taken.
- the thickness, width, and length of the cast plate 1B can be appropriately selected.
- the cast coil material is used as a material for a rolled plate that is a material for a plastic working member such as a pressed member
- the cast plate has a thickness of 10 mm or less, more preferably 7 mm or less, and particularly 5 mm or less. It does not exist and has excellent strength.
- the width of the cast plate 1B can be selected according to, for example, the size of the plastic working member or the rolled plate, and may be 100 mm to 900 mm.
- the length of the cast plate 1B can be very long, such as 30 m or more, and further 100 m or more, and can be shortened depending on the application.
- the long cast plate 1B having the side surface 310 having the specific shape can be manufactured by a continuous casting method using a casting nozzle 4A shown in FIG. 8B.
- the nozzle 4A is a cylindrical body composed of a pair of main body plates 420 and a pair of prismatic side dams 421A that are combined with the main body plates 420 to form a rectangular opening.
- the main body plates 420 are arranged apart from each other by a predetermined interval (an interval designed corresponding to the thickness of the cast plate 1B), and the side dams 421A are combined so as to sandwich both edges of the main body plates 420.
- the side dam 421A is particularly characterized by the shape of its inner side surface 410.
- the central portion in the thickness direction of the nozzle 4A protrudes toward the inside of the nozzle 4A, and from this central portion toward the main body plate 420 side. It has a concave mountain shape.
- the inner side surface 410 has the above-mentioned single mountain shape over the entire length of the side dam 421A. As described above, the inner side surface 410 may not have a uniform shape over the entire length.
- the tip side region of the nozzle 4A for example, a region within 10% of the length of the body plate 420 from the tip edge of the body plate 420 toward the inside of the nozzle 4A
- a region exceeding 10% of the length of the main body plate 420 from the front end edge of the main body plate 420 toward the inside of the nozzle 4A may be the above-described one mountain shape.
- the inner surface 410 has a uniform shape over the entire length, a side dam is easily formed.
- the above-described single mountain shape indicates a form constituted by a plane, but a form constituted by a curved surface, for example, an arc shape or a wave shape may be employed.
- the maximum distance Ws between the projecting portion and the recessed portion in the single mountain-shaped inner surface 410 is 0.5 mm or more.
- the maximum distance Ws corresponds to the distance from the most protruding point to the plane including the ridgeline between the inner surface of the main body plate 420 and the inner surface 410 of the side dam 421A, from the plane in the thickness direction of the nozzle 4A. .
- the side surface 310 of the cast plate 1B is uneven as if the shape of the inner surface 410 of the nozzle 4A is transferred. It becomes a shape.
- the constituent material of the nozzle 4A is a material having excellent heat resistance and high strength, such as aluminum oxide, silicon carbide, calcium silicate, alumina sintered body, boron nitride sintered body, carbon-based material, glass fiber-containing material, etc. Can be used. Since the oxide material easily reacts with molten magnesium, when the oxide material is used as a constituent material of the nozzle 4A, a low oxygen layer made of a material having a low oxygen content is provided at a contact point with the molten metal. preferable. Examples of the constituent material of the low oxygen layer include at least one selected from boron nitride, graphite, and carbon.
- the constituent materials of the main body plate 420 and the side dam 421A may be the same or different.
- the above continuous casting method can utilize a twin roll casting method or a twin belt casting method.
- the continuous casting method is preferable because rapid melting and solidification of the molten metal can reduce oxides and segregation, and can suppress generation of coarse crystal precipitates exceeding 10 ⁇ m.
- the twin roll casting method is preferable because it can be rapidly solidified by using a mold having excellent rigidity and thermal conductivity and a large heat capacity, so that a cast plate with less segregation can be formed.
- the cooling rate at the time of casting is preferably as high as possible. For example, if the cooling rate is 100 ° C./second or more, precipitates generated at the interface of the columnar crystals can be made as fine as 20 ⁇ m or less.
- the nozzle 4A is arranged in a continuous casting machine, and the molten magnesium alloy is discharged from the nozzle 4A, and the molten metal is rapidly solidified by a mold to continuously produce the cast plate 1B.
- the produced long cast board 1B can manufacture a cast coil material by winding up with a winder suitably.
- the inner diameter and outer diameter of the cast coil material can be appropriately selected according to, for example, the thickness and length of the cast plate. However, if the inner diameter is too small or the thickness is too thick, the cast plate may be cracked when the cast plate is wound. In the case where the inner diameter is small, it is preferable to control the temperature immediately before winding the cast plate as in the case of Embodiment 1-1 so that winding can be performed without causing cracks.
- the casting nozzle 4A having the concave and convex inner side surface 410 As shown in a test example to be described later, the chipping and cracking of the edge portion are suppressed, and a long cast plate made of a magnesium alloy is continuously formed. And can be manufactured stably. Moreover, the long cast board 1B can be manufactured continuously and stably by making the cross-sectional shape of the cast board 1B into a specific uneven
- Embodiment 3-3 a magnesium alloy cast coil material according to Embodiment 3-3 and a method for manufacturing the same will be described.
- the basic configuration of the embodiment 3-3 is the same as the casting coil material 1B and the manufacturing method (casting nozzle 4A) of the embodiment 3-2 described above, and the main differences are the side shape of the casting coil material 1C, It is in the shape of the inner surface of the casting nozzle 4B used for manufacturing this casting coil material 1C.
- this difference will be described in detail, and detailed description of configurations and effects overlapping with those of the embodiment 3-2 will be omitted.
- the cast plate 1 ⁇ / b> C has a side surface 312 formed of a curved surface in a cross section (showing an end surface in FIG. 9A).
- the side surface 312 has a shape in which a central portion in the thickness direction of the cast plate 1C swells and converges from the central portion toward each surface 311 of the cast plate 1C, and has a semicircular arc shape at the end.
- the maximum protrusion distance Wb in the direction orthogonal to the thickness direction of the cast plate 1C is 0.5 mm or more.
- the maximum protrusion distance Wb is a straight line in the thickness direction orthogonal to the surface 311 of the cast plate 1C, and the straight line l 2 passing through the most protruding point in the convex portion of the side surface 312, the side surface 312 and the surface 311
- a straight line l 3 passing through the ridge line 313 is taken, the distance between the straight lines l 2 and l 3 is taken.
- the ridge line 313 is typically a straight line passing through the inflection point on the surface 311.
- the long cast plate 1C having the side surface 312 having the specific shape can be manufactured by a continuous casting method using a casting nozzle 4B shown in FIG. 9B.
- the nozzle 4B is a cylindrical body composed of a pair of main body plates 420 and a pair of prismatic side dams 421B, like the nozzle 4A of the embodiment 3-1.
- the side dam 421B is particularly characterized by the shape of its inner side surface 411.
- the central portion in the thickness direction of the nozzle 4B is recessed, and the width of the side dam 421B increases from this central portion toward the main body plate 420 side. It is concave.
- the width of the side dam 421B refers to the size in a direction (left and right direction in FIGS. 9A and 9B) orthogonal to the thickness direction of the nozzle 4B (up and down direction in FIGS. 9A and 9B).
- the inner side surface 411 has the concave shape over the entire length of the side dam 421B.
- the concave shape indicates a form constituted by a curved surface, but a form constituted by a plane, specifically, the single mountain shape shown in the embodiment 3-2 (however, the direction of the depression is reversed) It can be.
- the maximum distance Ws between the concave portion and the chord of the concave portion is 0.5 mm or more.
- the maximum distance Ws is a distance from the most concave point to a plane including the ridgeline between the inner surface of the main body plate 420 and the inner side surface 411 of the side dam 421B, along the thickness direction of the nozzle 4B.
- the string for the concave portion corresponds to a straight line connecting both ridge lines in the thickness direction.
- the molten magnesium alloy is guided by the concave inner side surface 411 and transferred to the mold, so that the side surface 312 of the cast plate 1C has a convex shape in which the shape of the inner side surface 411 of the nozzle 4B is transferred. .
- the chipping and cracking of the edge portion are suppressed, and the magnesium alloy A long cast plate made of can be manufactured continuously and stably.
- the long cast board 1C can be manufactured continuously and stably by making the cross-sectional shape of the cast board 1C into a specific convex shape.
- Embodiment 3-4 A method for manufacturing a magnesium alloy cast coil material according to Embodiment 3-4 will be described with reference to FIGS. 10A and 10B.
- the basic configuration of the embodiment 3-4 is the same as the method for producing the cast coil material (cast nozzle 4A) of the embodiment 3-2 described above, and the main difference is the casting nozzle used for producing the cast coil material. Is in the shape of Hereinafter, this difference will be described in detail, and detailed description of configurations and effects overlapping with those of the embodiment 3-2 will be omitted.
- the casting nozzle 4C is a cylindrical body composed of a pair of main body plates 420 and a pair of prismatic side dams 421C, like the nozzle 4A of the embodiment 3-2.
- the side dam 421C is characterized by the shape of the tip portion (portion on the nozzle opening side). Specifically, the corner formed by the end surface 413 of the side dam 421C on the front end side of the nozzle 4C and the inner side surface 412 of the side dam 421C is cut off, and the side dam 421C includes an inclined surface 414 on the front end side.
- the inclined surface 414 forms an angle ⁇ with the virtual extension surface of the inner side surface 412 between 5 ° and 45 °.
- the inner side surface 412 is a flat surface and does not have a curved portion, unlike the side dams 421A and 421B of the embodiments 3-1 and 3-2.
- the casting nozzle 4C is arranged such that the front end edge 420E of the main body plate 420 and the end surface 413 of the side dam 421C are shifted in the longitudinal direction of the nozzle 4C (vertical direction in FIG. 10B, equal to the molten metal transfer direction).
- the side dam 421C is disposed so that the end surface 413 of the side dam 421C protrudes forward in the molten metal transfer direction from the tip edge 420E of the main body plate 420.
- the side dam 421 ⁇ / b> C is arranged so that the ridge line 415 between the inclined surface 414 and the inner side surface 412 is located on the inner side of the front end edge 420 ⁇ / b> E of the main body plate 420.
- the flow rate of the molten magnesium alloy flowing through the nozzle 4C is adjusted, and the ridgeline 415 and the main body plate are also adjusted.
- the distance d between the front end edge 420E of 420 the molten metal can be discharged toward the mold without being guided by the side dam 421C at the front end portion of the nozzle 4C. That is, the nozzle 4C can be configured to have a portion (here, the tip portion) that does not contact the molten metal.
- the molten metal can be effectively prevented from being cooled by the side dam 421C, particularly at the tip portion of the nozzle 4C, and the high temperature molten metal can be transferred to the tip of the nozzle 4C.
- the distance d between the ridge line 415 and the front edge 420E of the main body plate 420 is 5 mm or less.
- the molten metal flowing through the casting nozzle 4C is not guided by the side dam 421C at the tip of the nozzle 4C as described above, it can be freely deformed to some extent. Therefore, by performing continuous casting using the nozzle 4C, for example, the cast plate 1B having the uneven side surface 310 of Embodiment 3-2 or the cast plate having the convex side surface 312 of Embodiment 3-3.
- a cast plate having a shape having at least one curved portion on the side surface, such as 1C, can be manufactured.
- ⁇ Modification 3-1 >>
- the inner side surface has a specific shape, and the shape on the tip side can be the corner drop shape described in the embodiment 3-4.
- a molten magnesium alloy having a composition equivalent to AZ91 alloy (Mg-9.0% Al-1.0% Zn (all mass%)) was prepared, and a cast plate having a thickness of 5 mm and a width of 400 mm was continuously formed.
- the length (m) that can be manufactured without chipping at the edge of the cast plate was examined.
- Both the casting nozzle 4A of the embodiment 3-2 and the casting nozzle 4B of the embodiment 3-3 have a maximum distance Ws of 1.0 mm.
- the casting nozzles 4A and 4B were used, a long cast plate having a length of 400 m could be continuously produced.
- the obtained cast plate is expected to have few edge cracks and cracks over the entire length, and to reduce the removal amount by trimming.
- the manufactured long cast board was wound up and used as the coil material.
- the casting nozzle prepared as a comparison when the cast plate was produced 15 m, chipping and cracking of the edge increased, and casting was stopped.
- a long cast plate having a length of 400 m could be produced in the same manner as the test results.
- the obtained cast plate had few chippings and cracks at the edge, and the chipping and cracking at the edge could be further reduced by combining the corner dropping structure with the casting nozzles 4A and 4B.
- the above-described embodiment can be appropriately changed without departing from the gist of the present invention, and is not limited to the above-described configuration.
- the composition (type and content of additive element) of the magnesium alloy, the thickness, width, and length of the magnesium alloy cast coil material, the shape of the inner surface of the side dam, the maximum protruding distance, and the like can be appropriately changed.
- a drum-shaped coil material wound to a small diameter can be obtained.
- Embodiment 1-1 by combining the technique of Embodiment 1-1 and the techniques of Embodiments 3-1 to 3-4, a coil material obtained by winding a plate-like material having a non-rectangular section into a small diameter can be obtained. Then, by combining the techniques of Embodiment 1-1, Embodiments 2-1 to 2-2, and Embodiments 3-1 to 3-4, a sheet material having a non-rectangular cross section is wound to a small diameter. A drum-shaped coil material can be obtained.
- the magnesium alloy sheet of the present invention is a member of various electric / electronic devices, particularly a portable or small-sized electric / electronic device casing, various fields where high strength is desired, such as automobiles and aircraft. It can utilize suitably for the raw material of components, such as. Moreover, this invention magnesium alloy casting coil material can be utilized suitably for the raw material of the said this invention magnesium alloy board
- the manufacturing method of the magnesium alloy cast coil material of the present invention can be suitably used for the production of the magnesium alloy cast coil material of the present invention.
- plate material can be utilized suitably for manufacture of the said this invention magnesium alloy board
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Abstract
Description
巻取工程:前記板状材の巻き取り直前の温度T(℃)を、その板状材の厚さtと曲げ半径R(mm)とで表される表面歪み((t/R)×100)が、室温における当該板状材の伸びelr(%)以下となる温度に制御して巻取機により巻き取り、室温における伸びelrが10%以下である鋳造コイル材を得る。
(1)コイル材を構成するマグネシウム合金の固相線温度をTs(K)、熱処理温度をTan(K)とするとき、Tan≧Ts×0.8を満たす熱処理温度Tan(K)で、保持時間が30分以上の熱処理を施して板材を製造する。
(2)コイル材の厚さtに対して、t×90%以上の部分を用いて板材を製造する。
(3)コイル材に圧下率20%未満の圧延を施して板材を製造する。
[鋳造コイル材、マグネシウム合金板材]
(組成)
上記本発明コイル材や本発明マグネシウム合金板材を構成するマグネシウム合金は、Mgに添加元素を含有した種々の組成のもの(残部:Mg及び不純物)が挙げられる。特に、本発明では、連続鋳造された鋳造材において、室温での伸びが10%以下を満たす種々の組成のものが挙げられる。さらには、上記の伸びの規定に加え、室温での引張強さが250MPa以上を満たす組成が好ましい。代表的な組成は、添加元素の合計含有量が7.3質量%以上のものが挙げられる。添加元素が多いほど、強度や耐食性などに優れるが、多過ぎると偏析による欠陥や塑性加工性の低下による割れなどが生じ易くなることから、合計含有量は、20質量%以下が好ましい。添加元素は、例えば、Al、Si、Ca、Zn、Mn、Sr、Y、Cu、Ag、Sn、Li、Zr、Ce、Be及び希土類元素(Y、Ceを除く)から選択される少なくとも1種の元素が挙げられる。
本発明コイル材は、室温(20℃程度)での伸びが10%以下を満たす(0%を除く)。引張強さが高いほど伸びが低い傾向にあり、マグネシウム合金の組成によっては、上記伸びが5%以下、更に4%以下のものが挙げられる。鋳造コイル材を安定して生産するためには、室温での伸びは、0.5%以上が好ましい。本発明鋳造コイル材は、室温での伸びが低めであるが、後述するように表面性状に優れていることから、高温での引張試験において割れなどが生じ難く、高温での伸びが高いことが特徴の一つと言える。例えば、200℃での伸びが10%以上、好ましくは、40%以上を満たす。なお、上記本発明製造方法により製造されることで、巻取時には、伸びが高められた状態であるため、巻き取られた後の本発明鋳造コイル材の室温における伸びが上述のように低めであっても問題無い。
本発明コイル材は、厚さtが7mm以下の薄い板状材が円筒状に巻回された形態である。この鋳造コイル材は、上述のように巻き取る直前の板状材の温度を制御する本発明製造方法により製造されることで、巻取機のチャック部に把持された巻き始め箇所を含めた全長に亘って、その表面に割れや酸化などによる変色が実質的に無く、表面性状に優れる。より具体的には、例えば、内部に存在する析出物の粒子が微細であり(平均粒径:50μm以下)、表面に、深さ100μm以上、かつ幅100μm以下で、当該コイル材の長手方向となす角が5°以上である疵が存在しない形態が挙げられる。或いは、酸化膜が非常に薄い、或いは、実質的に存在しない形態、定量的には、酸化膜の最大厚さが0.1mm以下、好ましくは、10μm以下、より好ましくは、1μm以下である形態が挙げられる。鋳造コイル材の表面に存在する酸化膜は、薄いほど、表面性状に優れることから、最大厚さが上記範囲を満たせば、全体の厚さが均一的でなくても構わない。なお、本発明コイル材及び本発明マグネシウム合金板材の厚さは、長手方向の任意の地点において、長手方向と直交する方向(鋳造コイル材では、幅方向)に厚さをとったときの平均厚さとする。巻取機のチャック部に把持された巻き始め箇所は、捨て寸として後加工に用いない場合、この巻き始め箇所以外における板状材の全長に亘って割れなどが生じていなければ、巻き始め箇所にごく微細な疵や把持癖などが生じることは、許容される。
(コイル材の製造方法)
本発明コイル材は、溶融状態のマグネシウム合金を連続鋳造機に供給して製造した板状材を巻取機により巻き取ることで製造する。その際、この板状材の巻き取り直前の温度を制御することで鋳造コイル材を得る。
連続鋳造法は、急冷凝固が可能であるため、添加元素の含有量が多い場合でも偏析や酸化物などを低減でき、圧延などの塑性加工性に優れる鋳造材が得られる。連続鋳造には、双ロール鋳造法、双ベルト鋳造法、ベルトアンドホイール鋳造法といった種々の方法があるが、板状材の製造には、双ロール鋳造法や双ベルト鋳造法が好適である。双ロール鋳造法は、剛性及び熱伝導性に優れ、熱容量が大きい鋳型を用いて急冷凝固が可能であることから特に好ましい。なお、双ベルト鋳造法や双ロール鋳造法に代表される鋳造材の両面を急冷凝固する方法では、中心線偏析が生成されることがあるが、中心線偏析の存在領域が、鋳造材の厚さ方向において中心から±20%の範囲内、特に±10%の範囲内であれば、上述したマグネシウム合金部材の素材に利用する場合に不具合が生じないことを確認している。
上記の鋳造により得られた板状材は、鋳造機から巻取機までの間で温度を調整して、巻き取り直前の板状材の温度を制御する。この巻き取り直前の板状材の温度T(℃)は、その板状材の厚さtと曲げ半径R(mm)とで表される表面歪み((t/R)×100)が、温度T(℃)における当該板状材の伸びelr(%)以下、好ましくは、室温における当該板状材の伸びelr(%)以下となる温度とする。板状材の巻き取りに伴う割れの発生は、主に板状材に生じる表面歪みが板状材の伸びを上回ることにより生じると考えられる。この板状材の伸びは、後述するように、温度が高いほど大きくなる。そのため、巻き取り直前の板状材の温度を上記のように制御すれば、割れの生じにくい、或いは全く割れのない鋳造コイル材を得ることができる。特に、表面歪みの比較的大きい場合、例えばt/R≧0.01の場合に巻き取り直前の板状材の温度を制御することが有効である。より具体的な最小曲げ半径Rminとしては、500mm以下、より好ましくは、400mm以下、さらに好ましくは、300mm以下、とりわけ250mm以下が挙げられる。
特に、上記板状材の巻き始め箇所を加熱する場合、以下の本発明巻取機を好適に利用することができる。本発明の巻取機は、連続鋳造機により連続的に製造された板状材を円筒状に巻き取るためのコイル材用巻取機であり、上記板状材の端部を把持するチャック部と、上記板状材において上記チャック部により把持される領域を加熱する加熱手段とを備える。上記加熱手段を備える本発明巻取機を利用することで、上記チャック部によりマグネシウム合金からなる板状材に最小曲げ半径の曲げが加えられる場合であっても、上記板状材においてチャック部により把持される領域、即ち、巻き始め箇所を容易に加熱できる。この巻き始め箇所が十分に加熱されてからチャック部に把持されるように加熱手段を備えておく。この加熱手段は、電熱ヒータなどが利用し易いと考えられる。なお、巻胴の回転により加熱手段の配線が捩れる恐れがあるため、摺動接点などを利用することが好ましい。巻取機に備える加熱手段による加熱と、連続鋳造機と巻取機との間に配置した加熱手段による加熱とを併用して行ってもよい。
上記本発明製造方法により得られた鋳造コイル材は、上述のように表面性状に優れることから、例えば、上記鋳造コイル材を用意し、上記鋳造コイル材の厚さtに対して、t×90%以上の部分を用いて本発明マグネシウム合金板材を製造することができる。より具体的には、このマグネシウム合金板材は、研磨などの処理を実質的に行わずに、或いは、研磨による除去量が少なくてよい簡単な研磨処理を行ってから、適宜切断などすることで製造することができる。このように本発明鋳造コイル材を利用することで、表面性状に優れるマグネシウム合金板材を生産性よく製造することができる。このマグネシウム合金板材は、素材とした鋳造コイル材と同程度の厚さ、同程度の強度及び靭性を有する。
種々の厚さのマグネシウム合金鋳造材を巻き取る途中で、種々の温度に加熱して、種々の大きさの曲げ半径で巻き取って鋳造コイル材を製造した。そして、得られた鋳造コイル材の表面状態を調べた。
試験例1-1と同様にして鋳造コイル材を製造するにあたり、表面歪みが大きい場合について割れが生じることなく巻き取ることが可能な加熱温度を調べた。その結果を表3及び図3に示す。
試験例1-1で得られたマグネシウム合金鋳造コイル材を用いて、マグネシウム合金板材を作製した。
次に、鋳造後の板状材を、連続鋳造機から巻取機までの間に加熱を行うことなく巻き取りを行った試験例を説明する。本例では、連続鋳造機から排出された直後の板状材の温度が200℃となるように鋳造を行い、その板状材が巻取機に導入されるまでの間の板状材の全長を断熱材で囲って巻き取りを行った。本例では、AZ91D相当の組成のマグネシウム合金からなる溶湯を双ロール鋳造で鋳造し、得られた厚さ4mm、幅250mmの板状材を試料とした。巻き取り直前における板状材の温度は、150℃であった。その結果、最小曲げ半径Rminが300mmでも、板状材に割れが生じることなく巻き取れることが確認された。さらに、より薄く、比表面積が大きいために放熱性が高い板状材でも試験を行った。その結果、厚さ3mm、幅250mmの板状材を巻き取り直前の温度が150℃となるように保温し、巻き取った結果、最少曲げ半径Rminが200mmでも板状材に割れが生じることなく巻き取れることを確認した。
次に、上記の実施形態1-1や後述する他の実施形態において板状材を鋳造して巻き取る際に好適に利用できることは勿論、これらの実施形態における規定条件の有無に関わらず、広くマグネシウム合金鋳造コイル材の製造に適用できるマグネシウム合金鋳造コイル材の製造方法と、その方法により得られるマグネシウム合金鋳造コイル材を説明する。この技術によれば、コイル材の各ターン間に隙間ができ難いように巻き締められたマグネシウム合金鋳造コイル材を得ることができる。
このマグネシウム合金鋳造コイル材は、マグネシウム合金からなる長尺な鋳造材を巻き取ることで形成され、そのコイル状の鋳造材の両端面に外接する直線から、当該コイル状の鋳造材の外周面までの距離のうち、最も遠い距離をd、前記鋳造材の幅をwとしたとき、0.0001w<d<0.01wを満たす。そして、コイル状の鋳造材の外周面は、前記直線よりもコイル状の鋳造材の芯部側に位置する。
上述したマグネシウム合金鋳造コイル材は、以下に示すマグネシウム合金鋳造コイル材の製造方法により製造することができる。
巻き取り直前の鋳造材における幅方向の温度のバラツキを50℃以内とし、かつ当該鋳造材における幅方向の中間部の温度を両縁部の温度よりも高温となるように当該鋳造材の温度を制御する。
300kgf/cm2以上の巻き取り張力をかけて当該鋳造材を巻き取る。
次に、図6Aおよび図6B、図7を参照して、鼓状のマグネシウム合金鋳造コイル材とその製造方法をより具体的に説明する。この実施形態も他の実施形態と組み合せて利用することができる。ここでは、マグネシウム合金からなる鋳造材を作製し、この鋳造材を上記マグネシウム合金鋳造コイル材の製造方法、または従来の製造方法に基づいてコイル状に巻き取ったマグネシウム合金鋳造コイル材を作製する。
以上説明したコイル材の製造設備により、鋳造材1Aを連続的に作製しつつ、その鋳造材1Aをコイル状に巻き取った複数のコイル材2(表5の試料4-1~4-9)を作製した。各試料における鋳造材1Aの寸法は、全て同じ(長さ200m、平均幅300mm、平均板厚5mm、板厚のバラツキ±0.3mm以下)、コイル材2のターン数(45巻)も全て同じとした。また、鋳造材1Aの巻き取り張力も、巻取機210の巻胴221の回転速度を調節することで、ほぼ400kgf/cm2前後で一定となるようにした。なお、鋳造材1Aの板厚は、鋳造ロール211、211の出口近傍に配置された非接触式の測定器で測定した複数の測定結果を平均して求めた。数値の測定は、鋳造材1Aにおける幅方向中間部と両縁部の3箇所について、鋳造材1Aにおける巻き取り端から10mの位置から巻き終わり端に至るまでの間、10mごとに行った。鋳造材1Aの板厚の測定位置は、鋳造材1Aの温度の測定位置と同様に、鋳造材1Aの幅方向中央と、鋳造材1Aの側縁から20mm内側である。
次に、上記の実施形態1-1~2-2や後述する他の実施形態において板状材を鋳造して巻き取る際は勿論、これらの実施形態における規定条件の有無に関わらず、広くマグネシウム合金鋳造コイル材の製造に好適に適用できるマグネシウム合金鋳造コイル材の製造方法と、その方法により得られるマグネシウム合金鋳造コイル材を説明する。この技術によれば、鋳造に用いるノズルを特定の形状とすることで、異形の断面形状の板状材を得ることができる。このマグネシウム合金鋳造コイル材の製造方法は、マグネシウム合金の溶湯を連続鋳造機に供給して長尺な鋳造板を製造して巻き取る工程を備える。そして、上記連続鋳造機の鋳型に上記溶湯を供給するノズルが、上記鋳造板の側面が少なくとも一つの湾曲部を有する形状となるように構成されている。
図8Aおよび図8Bを参照して実施形態3-2に係るマグネシウム合金鋳造コイル材、及びその製造方法を説明する。このマグネシウム合金鋳造コイル材(図示せず)は、マグネシウム合金からなる長尺な鋳造板1Bが巻き取られてなるものである。この鋳造コイル材の特徴とするところは、鋳造板1Bの横断面形状にある。
図9Aおよび図9Bを参照して実施形態3-3に係るマグネシウム合金鋳造コイル材、及びその製造方法を説明する。実施形態3-3の基本的構成は、上述した実施形態3-2の鋳造コイル材1B、及び製造方法(鋳造ノズル4A)と同様であり、主たる相違点は、鋳造コイル材1Cの側面形状、この鋳造コイル材1Cの製造に利用する鋳造ノズル4Bの内側面の形状にある。以下、この相違点を詳細に説明し、実施形態3-2と重複する構成及び効果については、詳細な説明を省略する。
図10Aおよび図10Bを参照して実施形態3-4に係るマグネシウム合金鋳造コイル材の製造方法を説明する。実施形態3-4の基本的構成は、上述した実施形態3-2の鋳造コイル材の製造方法(鋳造ノズル4A)と同様であり、主たる相違点は、鋳造コイル材の製造に利用する鋳造ノズルの形状にある。以下、この相違点を詳細に説明し、実施形態3-2と重複する構成及び効果については、詳細な説明を省略する。
実施形態3-2、3-3で説明した、内側面が特定の形状であるノズルにおいて、その先端側の形状を実施形態3-4で説明した角落とし形状とすることができる。
実施形態3-2、3-3の鋳造ノズル4A、4Bと、比較として開口部が長方形状である鋳造ノズルとを用意し、双ロール鋳造機により連続鋳造を行い、鋳造板を連続して作製し、製造性を評価した。
110 連続鋳造機 120 巻取機 121 巻胴 122 チャック部
122a、122b 把持片
123a 凸部 123b 凹部 125 温度計 130、131 加熱手段
1A 鋳造材 1A´ 溶湯
2 マグネシウム合金鋳造コイル材
210 双ロール式連続鋳造機 211 鋳造ロール 212 鋳造ノズル
220 巻取機 221 巻胴 230 加熱手段 240 温度測定手段
1B、1C 鋳造板 310、312 側面 311 表面 313 稜線
4A、4B、4C 鋳造ノズル 420 本体板 420E 先端縁
421A、421B、421C サイドダム 410、411、412 内側面
413 端面 414 傾斜面 415 稜線
Claims (38)
- 金属からなる板状材を円筒状に巻き取ってコイル材とするコイル材の製造方法であって、
前記板状材は、連続鋳造機から排出されたマグネシウム合金の鋳造材で、その厚さt(mm)が7mm以下であり、
この板状材の巻き取り直前の温度T(℃)を、その板状材の厚さtと曲げ半径R(mm)とで表される表面歪み((t/R)×100)が、室温における当該板状材の伸び以下となる温度に制御して巻取機により巻き取り、室温における伸びが10%以下である鋳造コイル材を得ることを特徴とするコイル材の製造方法。 - 前記t/Rが0.01以上であることを特徴とする請求項1に記載のコイル材の製造方法。
- 前記板状材は、連続鋳造機から排出された直後の温度が350℃以下となるように鋳造されたことを特徴とする請求項1又は2に記載のコイル材の製造方法。
- 前記連続鋳造機から排出された板状材の温度を150℃以下の温度に冷却し、
前記冷却された板状材を巻取機により巻き取るまでの間に、この板状材の少なくとも一部を前記冷却温度よりも高い温度に加熱して前記板状材の巻き取り直前の温度を制御することを特徴とする請求項1~3のいずれか1項に記載のコイル材の製造方法。 - 前記連続鋳造機と巻取機との間に板状材の保温材を配置し、板状材の巻き取り直前の温度を制御することを特徴とする請求項1~4のいずれか1項に記載のコイル材の製造方法。
- 得られる鋳造コイル材の室温における引張強さが250MPa以上であることを特徴とする請求項1~5のいずれか1項に記載のコイル材の製造方法。
- 前記マグネシウム合金は、Al、Ca、Siから選択される少なくとも1種の元素を含有し、Al、Ca、Siの含有量(質量%)を用いて表わされる式値Dが以下を満たすことを特徴とする請求項1~8のいずれか1項に記載のコイル材の製造方法。
式値D={2.71×(Siの含有量)+2.26×[(Alの含有量)-1.35×(Caの含有量)]+2.35×(Caの含有量)}≧14.5 - 前記マグネシウム合金は、Al、Ca、Si、Zn、Mn、Sr、Y、Cu、Ag、Sn、Li、Zr、Be、Ce及び希土類元素(Y、Ceを除く)から選択される少なくとも1種の元素を含有することを特徴とする請求項1~9のいずれか1項に記載のコイル材の製造方法。
- 前記連続鋳造機は、双ロール鋳造機であり、
前記連続鋳造機の排出口から前記板状材の進行方向に500mmまでの範囲の板状材の温度が250℃以下となるように鋳造を行うことを特徴とする請求項1~10のいずれか1項に記載のコイル材の製造方法。 - 前記板状材を加熱するときの加熱温度は、350℃以下とすることを特徴とする請求項4に記載のコイル材の製造方法。
- 前記巻取機は、加熱手段を備えており、
前記板状材の加熱は、前記加熱手段により行うことを特徴とする請求項4又は12に記載のコイル材の製造方法。 - 巻き取り直前の前記板状材における幅方向の温度のバラツキを50℃以内とし、かつ当該板状材における幅方向の中間部の温度を両縁部の温度よりも高温となるように当該板状材の温度を制御し、
300kgf/cm2以上の一定の巻き取り張力をかけて当該板状材を巻き取ることを特徴とする請求項1~13のいずれか1項に記載のコイル材の製造方法。 - 前記板状材における長手方向の温度のバラツキを50℃以内としたことを特徴とする請求項14に記載のコイル材の製造方法。
- 巻き取り直前における板状材の温度の測定は、板状材の巻き取り端から10m作製した位置から開始することを特徴とする請求項14又は15に記載のコイル材の製造方法。
- 前記連続鋳造機は、鋳型にマグネシウム合金の溶湯を供給するノズルを備え、
このノズルは、前記板状材の側面が少なくとも一つの湾曲部を有する形状となるように構成されていることを特徴とする請求項1~16のいずれか1項に記載のコイル材の製造方法。 - 前記ノズルは、離間して配置される一対の本体板と、前記本体板の両縁を挟むように配置されて、前記本体板と組み合せて矩形状の開口部をつくる一対の角柱状のサイドダムとで構成され、
前記サイドダムにおける前記溶湯に接触する内側面の少なくとも先端側領域は、前記ノズルの厚さ方向における中心部が突出し、当該中心部から前記本体板側に向かって凹んだ一つ山形状であり、
前記突出部分と前記凹部分との最大距離が0.5mm以上であることを特徴とする請求項17に記載のコイル材の製造方法。 - 前記ノズルは、離間して配置される一対の本体板と、前記本体板の両縁を挟むように配置されて、前記本体板と組み合せて矩形状の開口部をつくる一対の角柱状のサイドダムとで構成され、
前記サイドダムにおける前記溶湯に接触する内側面の少なくとも先端側領域は、前記ノズルの厚さ方向における中心部が凹んだ円弧状であり、
前記凹部分と前記凹部分の弦との最大距離が0.5mm以上であることを特徴とする請求項17に記載のコイル材の製造方法。 - 前記ノズルは、離間して配置される一対の本体板と、前記本体板の両縁を挟むように配置されて、前記本体板と組み合せて矩形状の開口部をつくる一対の角柱状のサイドダムとで構成され、
前記サイドダムは、ノズル先端側の端面と、前記溶湯に接触する内側面とがつくる角部が角落としされた傾斜面を有しており、
前記傾斜面と、前記内側面の仮想延長面とがつくる角をθとするとき、前記θは、5°以上45°以下であり、
前記傾斜面と前記内側面との稜線が前記本体板の先端縁よりも内側に位置するように前記サイドダムを配置することを特徴とする請求項17~19のいずれか1項に記載のコイル材の製造方法。 - マグネシウム合金の鋳造板材からなり、
厚さが7mm以下、
室温における伸びが10%以下であり、
円筒状に巻き取られていることを特徴とするコイル材。 - 引張強さが250MPa以上であることを特徴とする請求項21に記載のコイル材。
- 前記鋳造板材の長さが30m以上であることを特徴とする請求項21又は22に記載のコイル材。
- 前記マグネシウム合金は、Al、Ca、Siから選択される少なくとも1種の元素を含有し、Al、Ca、Siの含有量を用いて表わされる式値Dが以下を満たすことを特徴とする請求項21~23のいずれか1項に記載のコイル材。
式値D={2.71×(Siの含有量)+2.26×[(Alの含有量)-1.35×(Caの含有量)]+2.35×(Caの含有量)}≧14.5 - 前記マグネシウム合金は、添加元素としてAl、Ca、Si、Zn、Mn、Sr、Y、Cu、Ag、Sn、Li、Zr、Be、Ce及び希土類元素(Y、Ceを除く)から選択される少なくとも1種の元素を合計7.3質量%以上含有し、残部がMg及び不純物からなることを特徴とする請求項21~24のいずれか1項に記載のコイル材。
- 前記マグネシウム合金は、Alを7.3質量%以上12質量%以下含有することを特徴とする請求項21~25のいずれか1項に記載のコイル材。
- 前記マグネシウム合金は、Y、Ce、Ca、及び希土類元素(Y、Ceを除く)から選択される少なくとも1種の元素を合計0.1質量%以上含有し、残部がMg及び不純物からなることを特徴とする請求項21~26のいずれか1項に記載のコイル材。
- 前記鋳造板材の横断面において、この鋳造板材の側面が少なくとも一つの湾曲部を有する形状であり、かつ、前記鋳造板材の厚さ方向に直交する方向における前記湾曲部の最大突出距離が0.5mm以上であることを特徴とする請求項21~27のいずれか1項に記載のコイル材。
- 鋳造板材を巻き取ったコイル材の両端面に外接する直線から、当該鋳造コイル材の外周面までの距離のうち、最も遠い距離をd(mm)、前記鋳造板材の幅をw(mm)としたとき、
0.0001w<d<0.01wを満たし、
かつ、コイル材の外周面は、前記直線よりも鋳造コイル材の芯部側に位置することを特徴とする請求項21~28のいずれか1項に記載のコイル材。 - 前記コイル材のターン間の隙間が1mm以下であることを特徴とする請求項29に記載のコイル材。
- 前記コイル材を構成する鋳造板材の板厚のバラツキが±0.2mm以下であることを特徴とする請求項29又は30に記載のコイル材。
- 請求項21~31のいずれか1項に記載のコイル材を用意し、
当該コイル材を構成するマグネシウム合金の固相線温度をTs(K)、熱処理温度をTan(K)とするとき、Tan≧Ts×0.8を満たす熱処理温度Tan(K)で、保持時間が30分以上の熱処理を施して板材を製造することを特徴とするマグネシウム合金板材の製造方法。 - 前記熱処理後に圧下率20%以上の圧延を施して前記板材を製造することを特徴とする請求項32に記載のマグネシウム合金板材の製造方法。
- 請求項21~31のいずれか1項に記載のコイル材を用意し、
当該コイル材の厚さt(mm)に対して、t×90%以上の部分を用いて板材を製造することを特徴とするマグネシウム合金板材の製造方法。 - 請求項21~31のいずれか1項に記載のコイル材を用意し、
当該コイル材に圧下率20%未満の圧延を施して板材を製造することを特徴とするマグネシウム合金板材の製造方法。 - 請求項1~20のいずれか1項に記載のコイル材の製造方法により得られたことを特徴とするマグネシウム合金コイル材。
- 請求項32~35のいずれか1項に記載のマグネシウム合金板材の製造方法により得られたことを特徴とするマグネシウム合金板材。
- 連続鋳造機により連続的に製造された板状材を円筒状に巻き取るためのコイル材用巻取機であって、
前記板状材は、マグネシウム合金からなり、
前記板状材の端部を把持するチャック部と、
前記板状材において前記チャック部により把持される領域を加熱する加熱手段とを備えることを特徴とするコイル材用巻取機。
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CN201180003026.6A CN102471859B (zh) | 2010-03-30 | 2011-03-22 | 卷材及其制造方法 |
KR1020127001982A KR101380461B1 (ko) | 2010-03-30 | 2011-03-22 | 코일재 및 그 제조 방법 |
AU2011233024A AU2011233024B2 (en) | 2010-03-30 | 2011-03-22 | Coil material and method for manufacturing the same |
US13/387,965 US9222160B2 (en) | 2010-03-30 | 2011-03-22 | Coil material and method for manufacturing the same |
EP11762622.6A EP2557197B1 (en) | 2010-03-30 | 2011-03-22 | Coil material and method for producing same |
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JP2010-157656 | 2010-07-12 | ||
JP2010157656 | 2010-07-12 | ||
JP2011050885A JP5939372B2 (ja) | 2010-03-30 | 2011-03-08 | コイル材及びその製造方法 |
JP2011-050885 | 2011-03-08 |
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EP (1) | EP2557197B1 (ja) |
JP (1) | JP5939372B2 (ja) |
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CN102933334B (zh) * | 2010-06-04 | 2016-11-02 | 住友电气工业株式会社 | 复合材料、连续铸造用部件、连续铸造用喷嘴、连续铸造方法、铸造材料和镁合金铸造卷材 |
CA2869103C (en) * | 2012-06-26 | 2023-05-02 | Biotronik Ag | Magnesium-zinc-calcium alloy, method for production thereof and use thereof |
SG11201406021PA (en) * | 2012-06-26 | 2014-10-30 | Biotronik Ag | Magnesium-aluminum-zinc alloy, method for the production thereof and use thereof |
WO2014001191A1 (en) * | 2012-06-26 | 2014-01-03 | Biotronik Ag | Magnesium alloy, method for the production thereof and use thereof |
CN103394543A (zh) * | 2013-07-22 | 2013-11-20 | 天津东义镁制品股份有限公司 | 一种led日光灯镁合金型材及其制造方法 |
JP5802818B1 (ja) * | 2014-10-29 | 2015-11-04 | 東芝産業機器システム株式会社 | 順送加工方法 |
CN106319311A (zh) * | 2015-06-18 | 2017-01-11 | 华为技术有限公司 | 通信设备 |
CN105950927B (zh) * | 2016-06-13 | 2018-04-10 | 太原理工大学 | 一种增强增韧型镁锂合金的制备方法 |
CN109136700A (zh) * | 2017-06-16 | 2019-01-04 | 比亚迪股份有限公司 | 高导热镁合金、逆变器壳体、逆变器及汽车 |
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KR101380461B1 (ko) | 2014-04-01 |
US9222160B2 (en) | 2015-12-29 |
AU2011233024A1 (en) | 2012-02-23 |
CN102471859A (zh) | 2012-05-23 |
CN104674143A (zh) | 2015-06-03 |
AU2011233024B2 (en) | 2014-09-25 |
EP2557197A4 (en) | 2017-08-16 |
JP5939372B2 (ja) | 2016-06-22 |
JP2012035323A (ja) | 2012-02-23 |
US20120128997A1 (en) | 2012-05-24 |
KR20120047917A (ko) | 2012-05-14 |
EP2557197A1 (en) | 2013-02-13 |
CN104674143B (zh) | 2017-04-12 |
EP2557197B1 (en) | 2019-05-29 |
CN102471859B (zh) | 2015-04-29 |
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