TW201247336A - Magnesium alloy rolled material, magnesium alloy member and method for producing magnesium alloy rolled material - Google Patents

Abstract

Provided are a rolled Mg alloy material having a wide width and exhibiting uniform mechanical characteristics in the width direction; a Mg alloy member formed by plastically forming the rolled Mg alloy material; and a method for producing the rolled Mg alloy material. The method for producing a rolled Mg alloy material involves rolling a Mg alloy material with reduction rollers. The width of the Mg alloy material is 1000 mm or more and the reduction rollers have three or more regions in the width direction. The temperature in each region is controlled such that the difference between the maximum temperature and the minimum temperature is 10 DEG C or lower in the width direction of the reduction roller surfaces. It is possible to reduce the variation of the rolled state in the width direction by minimizing the temperature difference in the entire width direction of the reduction rollers. As a consequence, it is possible to produce a rolled Mg alloy material that exhibits substantially uniform mechanical characteristics in the width direction.

Description

201247336 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a magnesium alloy rolled material, a magnesium alloy member, and a method for producing a magnesium alloy rolled material. In particular, it relates to a magnesium alloy rolled material in which the mechanical properties of the rolled material are uniform in the width direction, a magnesium alloy member after plastic working the magnesium alloy rolled material, and the above magnesium. A method of manufacturing an alloy rolled material. [Prior Art] In recent years, magnesium alloy sheets have been used for applications such as mobile phones and notebook computers. Magnesium alloys are mainly made of cast materials made by precision casting and die casting because of poor plastic workability. Usually, the casting material is subjected to processing such as rolling processing in order to improve the mechanical properties. The technique disclosed in Patent Document 1 is a cast material produced by a two-roll continuous casting method using a magnesium alloy corresponding to the AZ91 alloy in the A S TM specification, and is subjected to rolling. Specifically, the roller L is carried out by controlling the surface temperature of the magnesium alloy material plate and the surface temperature of the rolling mill immediately before the insertion into the rolling mill to a specific temperature. [PRIOR ART DOCUMENT] [Patent Document 1] [Patent Document 1] JP-A-2007-098470 (Summary of the Invention) -5-201247336 [Problems to be Solved by the Invention] With the expansion of the use range of magnesium alloys, large sizes The development of magnesium alloy materials has been expected by the industry. According to the above rolling, for example, in the case where the width of the magnesium alloy material is not too large, the respective surface temperatures of the magnesium alloy material and the rolling mill naturally tend to be uniform in the width direction. Therefore, it is difficult to cause a problem that the degree of rolling is not uniform in the width direction, and therefore it is easy to become a magnesium alloy rolled material having uniform mechanical properties in the width direction. However, if the width of the above-mentioned alloy material becomes larger, especially when it is changed to 1,000 mm or more, it is difficult to maintain the mechanical properties in the width direction. When the width is larger, the center portion in the width direction of the magnesium alloy material is easily maintained in a heated state during the rolling, but the both ends of the magnesium alloy material in the width direction tend to be easily cooled. Therefore, in the heating state in which the center portion and the both end portions are hard to maintain, the difference in the degree of rolling may occur. The present invention has been made in view of the above circumstances, and its object is to provide a magnesium alloy rolled material having a large width and uniform mechanical characteristics in the width direction. Another object of the present invention is to provide a magnesium alloy member using the above-described magnesium alloy rolled material. Another object of the present invention is to provide a method for producing the above-described magnesium alloy rolled material. [Means for Solving the Problem] The magnesium alloy rolled material of the present invention is a magnesium alloy material which is fed into a rolling mill.

-6- S 201247336 Rolled, the width is 1000mm or more. In the width direction of the magnesium alloy rolled material, the (0〇2) plane, the (1〇〇) plane, the (101) plane, the (102) plane, the (110) plane, and the (103) plane of the center portion The peak intensity of X-ray diffraction is Ic( 002) 'lc(l〇〇) , ic(i〇i) , Ic(l〇2) 'Ic(110) , Ic(i〇3). The peak intensity of the X-ray diffraction at the above-mentioned respective faces in the width direction is IE (002), ΙΕ(100), Ι"1〇1), ϊ"102), Ie(" 〇), IE (l〇3). And when the bottom surface peaks 〇c and 〇E of the central portion and the end portion of the above-mentioned central portion and the end portion respectively adopt the following formula, the bottom surface peak ratio 〇c ·· Ic ( 002) / { Ic ( 100 ) + lc ( 002 + Ic ( 101) +IC ( 102) +IC ( 110) +IC ( 103) } Underside peak-to-peak ratio 0E : IE ( 002 ) / { IE ( 100 ) +IE ( 002 ) + Ie ( 101) +IE (102) +IE (110) + IE (103) } The ratio of the peak-to-bottom ratio of the end portion to the central portion 〇E/〇c is in accordance with the relationship of 0.89$ 〇E/〇cS 1.15. According to the magnesium alloy rolled material of the present invention, since the ratio of the peak-to-bottom ratio of the end portion of the magnesium alloy rolled material to the bottom portion of the central portion is 0E/0C in accordance with the above range, the alignment of the crystal faces is uniform in the width direction. of. Therefore, it is possible to produce a rolled material in which the plastic workability (formability) of the magnesium alloy rolled material is uniform in the width direction. Therefore, when the rolled material is plastically processed, substantially uniform processing can be achieved regardless of which place is processed. In one embodiment of the rolled material of the present invention, the average crystal grain size in the cross section orthogonal to the rolling direction of the center portion and the end portion is Dc 201247336 or DE, respectively, and the average of the end portion and the center portion The crystal grain size ratio de/dc is in accordance with the relationship of 0,7$ DE/Dcs 1.5. According to the above configuration, since the average crystal grain size ratio of the end portion of the magnesium alloy rolled material to the central portion is in the above range, the average crystal grain size is uniform in the width direction. Therefore, it is possible to produce a rolled material in which the strength and the corrosion resistance are substantially uniform in the width direction. In one embodiment of the rolled material according to the present invention, in the center portion and the end portion, when the elongation amount in the tensile test in the rolling direction is Ec or Ee, respectively, the elongation ratio of the end portion to the center portion is Ee/Ec It is in line with the 2/3SEe/Ec helmet 3/2 relationship. According to the above configuration, since the elongation ratio Ee/Ec of the end portion and the center portion of the magnesium alloy rolled material conforms to the above range, the elongation in the rolling direction is uniform in the width direction. In other words, substantially uniform processing can be achieved no matter which place is plastically machined. In one embodiment of the rolled material of the present invention, in the center portion and the end portion, when the tensile strength of the tensile test in the rolling direction is Tsc and TsE, respectively, the tensile strength ratio TsE of the end portion and the central portion is /Tsc is in accordance with the relationship of 〇.9STsE/TscS 1.1. According to the above configuration, the tensile strength ratio TsE/Tsc of the end portion and the central portion of the magnesium alloy rolled material conforms to the above range, so the tensile strength in the rolling direction is substantially uniform in the width direction. . An embodiment of the rolled material of the present invention, at the center portion and the end -8 -

In S 201247336, when the 0.2% proof stress of the tensile test in the rolling direction is ps C and P s E respectively, the 0.2% endurance ratio PsE/Psc of the end portion and the center portion is in accordance with the relationship of 0.9 SPsE/PscS 1.1. According to the above-described configuration, the 0.2% proof ratio PsE/Psc of the end portion of the magnesium alloy rolled material and the center portion is in the above range, so that the above-described endurance ratio in the rolling direction is uniform in the width direction. Therefore, it is possible to produce a rolled material having a formability in the roll direction and a substantially uniform roll width in the width direction. In one embodiment of the rolled material of the present invention, the magnesium alloy material contains 5% by mass or more and 12% by mass or less of aluminum. According to the above configuration, since aluminum is contained in the above range, a magnesium alloy rolled material having higher hardness and excellent corrosion resistance can be produced. The magnesium alloy member of the present invention is produced by subjecting the magnesium alloy rolled material of the present invention to plastic working. According to the above-described configuration, since the magnesium alloy rolled material having uniform mechanical properties in the width direction is plastically worked, it is possible to produce a magnesium alloy member having uniform characteristics regardless of the place. The method for producing a magnesium alloy rolled material according to the present invention is a method in which a magnesium alloy material is rolled by a rolling mill. The above-mentioned magnesium alloy material has a width of 1 000 mm or more. The above-mentioned rolling mill has three or more fields in the width direction. And controlling the temperature in each field such that the difference between the highest temperature and the lowest temperature in the width direction of the surface of the rolling mill is less than 10 ° C. According to the manufacturing method of the present invention, the width direction of the rolling mill is reduced. -9 - 201247336 The overall temperature difference is reduced, and the difference in the degree of rolling in the width direction can be reduced. Therefore, for a magnesium alloy material having a large width of 1 000 mm or more, uniform rolling in the width direction can be performed. Therefore, it is possible to produce a magnesium alloy rolled product in which the difference in thickness and edge cracking are few, the width is 1 000 mm or more, and the mechanical properties are substantially uniform in the width direction. In one embodiment, the temperature control is performed by introducing the temperature-adjusted heat medium oil into the rolling mill. According to the above configuration, since the heat medium oil is used for the temperature control, it is possible to quickly control the predetermined temperature from the inside of the rolling mill in each of the above fields. In one embodiment of the manufacturing method of the present invention, the temperature control is performed by attaching a temperature-adjusted heating fluid to the surface of the rolling mill. According to the above-described configuration, since the heating fluid is directly attached to the surface of the rolling mill for temperature control, it is possible to perform fineness in the width direction of the rolling mill for various fields and parts such as fields. control. Moreover, it is not necessary to assemble the temperature control mechanism inside the rolling mill. In other words, even if the existing rolling mill does not have the temperature control mechanism, the surface temperature can be easily controlled from the outside of the rolling mill for various fields by using the heating fluid. In one embodiment of the production method of the present invention, the temperature control is performed by controlling the temperature difference between two - 10, 2012,473,36 points of the surface of the rolling mill which are separated by 100 mm in the width direction to be 6 ° C or lower. According to the above configuration, the difference in temperature distribution of the entire rolling mill in the width direction can be easily controlled by reducing the temperature difference between the two points which are close to each other. Therefore, the difference in the degree of rolling of the magnesium alloy material in the width direction can be reduced. One embodiment of the manufacturing method of the present invention is to perform preheating so that the difference between the highest temperature and the lowest temperature in the width direction of the surface of the above-mentioned magnesium alloy material immediately before passing through the above rolling mill is 8 ° C or lower. According to the above configuration, the difference in the degree of rolling of the magnesium alloy material in the width direction can be more effectively reduced by reducing the temperature difference of the entire magnesium alloy material in the width direction. In other words, not only the rolling mill, but also the temperature of the material is reduced in the width direction, whereby uniform rolling can be performed. An embodiment of the manufacturing method of the present invention is to perform preheating so that the temperature difference between the two points of the surface of the magnesium alloy material before the rolling mill is separated by 10 mm in the width direction is controlled to 6 °C or less, and the temperature control is performed such that the temperature difference between the two points of the surface of the magnesium alloy rolled material immediately after passing through the rolling mill separated by 10 mm in the width direction is controlled to be 6 ° C or less. of. According to the above configuration, it is possible to more easily control the difference in the temperature distribution of the entire rolling mill in the width direction by reducing the temperature difference between the two points which are close to each other before and after the rolling. Therefore, the difference in the degree of rolling of the magnesium alloy material in the width direction can be more effectively reduced. -11 - 201247336 [Effects of the Invention] The magnesium alloy rolled material of the present invention has a large width and mechanical properties are uniform in the width direction. According to the magnesium alloy member of the present invention, the characteristics can be made uniform regardless of which part. According to the method for producing a magnesium alloy rolled material of the present invention, even a magnesium alloy material having a width of a width of 10 mm or more can be used to produce a rolled material having uniform mechanical properties in the width direction. [Embodiment] Hereinafter, embodiments of the present invention will be described. First, a magnesium alloy roll material will be described, and then a manufacturing method will be described with reference to Fig. 1 . <<Magnesium Alloy Rolled Material>> [Composition] The magnesium alloy rolled material includes various components including magnesium as a main component and the added element in the magnesium (the rest) It is an inevitable impurity). In particular, in the present invention, a magnesium-aluminum (Mg-Al)-based alloy containing at least aluminum (A1) in the additive element is preferably used. The more the aluminum is contained, the more excellent the corrosion resistance is, and the mechanical properties such as strength and plastic deformation resistance are also excellent. Therefore, in the present invention, the content of aluminum is preferably 3% by mass or more, more preferably 5% by mass or more, and particularly preferably 7.0% by mass or more, and more preferably 7.3 % by mass or more. However, if the content of aluminum exceeds 12% by mass, the plastic workability is lowered, so the upper limit is made 12% by mass. Aluminum

The amount of -12-S 201247336 is particularly preferably 11% by mass or less, and further preferably 8.3% by mass to 9.5% by mass. Examples of the additive element other than aluminum include zinc (Zn), manganese (Mn), bismuth (si), bismuth (Be), calcium (Ca), strontium (Sr), silver (γ), and copper (Cu). ), silver (Ag), tin (Sn), nickel (Ni), gold (Au), lithium (U), zirconium (Zr), planer (Ce), and rare earth elements RE (except Y, Ce) More than one element. In the case of containing such an element, the content thereof is 〇1% by mass or more and 10% by mass or less, more preferably 0.1% by mass or more and 5% by mass or less. Among these additive elements, at least one element selected from Si, Sn, Y, Ce, Ca, and a rare earth element (excluding Y and Ce) is 〇〇01% by mass or more, more preferably The total amount is 0.1% by mass or more and 5% by mass. /. In the following cases, it is excellent in heat resistance and flame retardancy. In the case of containing a rare earth element, the total content is preferably 0.1% by mass or more, and particularly preferably, the content of Y is 0.5% by mass or more. The impurity may be, for example, iron (F e ) or the like.

A more specific composition of the Mg-Al-based alloy is, for example, an AZ-based alloy in the ASTM standard (Mg-A Zn-based alloy 'Zn: 0.2% by mass to 1.5% by mass), and an AM-based alloy. (Mg-Al-Mn alloy, Μη: 0.15 mass% to 0.5 mass%), Mg-Al-RE (rare earth element) alloy, AX alloy (Mg-Al-Ca alloy, Ca: 0.2) Mass % to 6.0% by mass), AJ-based alloy (Mg-Al-Sr-based alloy 'Sr: 0.2% by mass to 7.0% by mass), and the like. In particular, the Mg-Al alloy-13-201247336 containing aluminum in an amount of 8.3% by mass to 9.5% by mass and Zn in an amount of 0.5% by mass to 1.5% by mass, and a representative AZ9 1 alloy, is excellent in corrosion resistance. it suits well. [size and size]

The magnesium alloy rolled material is not particularly limited as long as it has a width of 100 mm and a thickness as long as it matches the magnesium alloy member to be produced. For example, it is preferable that the gold strip-shaped coil is cut into a short length of an appropriate length, and it is preferable that the rolled material of which length has substantially the same thickness. In particular, the central portion and the end portion in the direction of the magnesium alloy must have a thickness ratio tE/tc of 〇.97StE/tcS when their thicknesses are respectively. By conforming to this range, in the case where the magnesium alloy is rolled into a strip-shaped coil, the occurrence of coiling and smashing can be reduced because of the thickness in the width direction. Here, from the center in the width direction of the rolled material, the range of about 50 mm or less, which is referred to herein as the end portion, is preferably within a range of about 100 mm or less in the direction toward the center. In the following description, the central portion and the end portion are the same positions as those described herein. [Mechanical characteristics] When the width of the magnesium alloy rolled material of the present invention is more than or equal to the width and the mechanical properties, a long strip or a magnesium rolled material or the like is appropriately selected. Regardless of the width direction, when the width of the gold roll material is tc, tE, the condition of 1.03 is that the material is coiled into the magnesium alloy degree, which is uniform, and the center portion is referred to the direction of the side edges. : From the vicinity of the side edge location, the central part mentioned above and the end more than 1 000mm, -14-

S 201247336 is still as described later, so that the degree of rolling in the width direction tends to be uniform, so that the various physical quantities described below tend to be uniform throughout the width direction. Hereinafter, specific mechanical characteristics will be described. (Bottom-to-peak ratio) The bottom-to-side ratio is obtained by X-ray diffraction and the center portion and the end portion in the width direction of the magnesium alloy rolled material. The bottom surface peak ratio 〇c in the central portion referred to herein is based on the (002) plane, the (100) plane, the (101) plane, the (102) plane, the (110) plane, and the (103) plane. The peak intensity Ic (002), Ic (100), Ic (101), IC(102), Ic(ll〇), Ic(l〇3) obtained by X-ray diffraction, using IC(002)/ { Ic ( 1 〇〇) +Ic ( 002 ) + IC ( 101 ) + IC (102) + IC ( 1 10 ) + IC ( 103 ) } is expressed by the equation. Similarly, the aspect ratio 〇E at the end of the surface referred to herein means: according to the (002) plane, the (100) plane, the (101) plane, the (102) plane, the (110) plane, and (103). The peak intensity I e (0 0 2 ), I e ( 1 0 〇), I e ( 1 〇 1 ) , I e ( 1 〇 2 ) , I e ( 1 ) obtained by the X-ray diffraction of the surface 1 〇) , I e ( 1 0 3 ), using IE ( 〇〇 2 ) / { IE ( 1 〇〇 ) + IE ( 002 ) + IE ( 101 ) + IE ( 102 ) + IE ( 110 ) + IE ( 103) The expression of } is expressed. The ratio 〇e/〇c of the peak-to-bottom ratio of the end portion to the bottom surface at the center portion obtained in this manner, if the condition of 0.89 S 0E/0CS 1.15 is satisfied, the aspect ratio in the width direction is It is essentially uniform. The magnesium alloy rolled material has the same crystal orientation in the width direction of the magnesium alloy rolled material, and has a substantially uniform plastic workability (formability) in the width direction. 201247336. These places where the x-ray diffraction is measured are measured at the center portion and the end portion, respectively. (Average crystal grain size) According to "Microscopic test method for crystal grain size of steel prepared by Japanese Industrial Standard JIS G 0551 (2005)", the center portion and the end portion are respectively obtained: a section orthogonal to the rolling direction The average crystal grain size in the middle. If the average crystal grain size of the central portion and the end portion are D c, D e , respectively, and the average crystal grain size ratio of the end portion to the central portion is DE/DC in accordance with the condition of 0.7 guest DE/DCS 1.5, It is considered that the average particle diameter is in the width direction and the tannin is uniform. In the case of such a magnesium alloy rolled material, the strength in the width direction and the corrosion resistance can be substantially uniform. This average crystal grain size is better than DE/DC if it is 0, and 9SDE/Dc is 1.1 each. (Elongation, tensile strength, and 0.2% endurance) The elongation, tensile strength, and 0.2% of the endurance are based on the tensile test method for metal materials specified in the Japanese Industrial Standards IS Z 2241 (1998). It is obtained for the center portion and the end portion. The tensile test is performed on the center portion and the end portion, respectively, so that the long side of the test piece is along the rolling direction, and the JIS 13B can be obtained in accordance with Japanese Industrial Standards jIS Z 2201 (1998). Test piece, and the tensile test was carried out using this test piece. And the elongation of the central part and the end part is regarded as Ec, ee ’ when -16 -

S 201247336 When the elongation ratio Ee/Ec of the end portion and the center portion is in accordance with the condition of 2/3$Ee/EcS 3/2, the elongation fl in the width direction is regarded as substantially the same. Similarly, the tensile strength is regarded as Tsc and TsE, respectively, and when the tensile strength ratio TsE/Tsc of the end portion and the central portion conforms to the condition of 0.9 STse/Tsc$1.1, it is regarded as stretching in the width direction. The intensity is essentially the same. Further, 0.2% of the endurance is regarded as Psc and PsE, respectively. When the endurance ratio of the end portion and the central portion is 0.2% of the PsE/Psc according to the condition of 0.9 SPse/PscS 1.1, it is regarded as 0.2 in the width direction. % of endurance is essentially consistent. When the elongation, the tensile strength, and the endurance of 0.2% satisfy the above range, the formability in the width direction tends to be uniform. <Magnesium alloy member> By the magnesium alloy roll material for the present invention By performing plastic working, a magnesium alloy member can be obtained. The plastic working system can be processed by various processes such as press working, deep drawing drawing, forging processing, flexing processing, and the like. A representative example of the magnesium alloy member subjected to such plastic working is a plastic working member including a three-dimensional shape such as a tubular member or a wavy member, which is integrally plasticized. Only a part of the magnesium alloy rolled material is subjected to plastic working, and a form having a plastic worked portion. Since the magnesium alloy rolled material of the present invention has the same mechanical properties in the width direction, the place where the plastic working can be performed is not limited by -17 to 201247336, and can be appropriately selected, so that it can be flexibly freely Plastic processing such as music. In the plastic working, when the rolled material is heated to 200 t to 300 ° C and then applied, cracking is less likely to occur, and a magnesium alloy member excellent in surface properties can be obtained. Further, since the magnesium alloy rolled material having the same mechanical properties in the width direction as described above is produced, the properties are uniform regardless of the magnesium alloy member. In addition, the magnesium alloy rolled material of the present invention can be formed into a plate-shaped magnesium alloy member having a predetermined shape by performing various processes such as cutting and punching of a suitable length. The obtained magnesium alloy member is further subjected to surface modification such as honing, chemical treatment, anti-corrosion treatment such as anodizing treatment, and decorative surface treatment such as coating, which can further improve corrosion resistance. In order to improve the commercial price, it is possible to increase the price of the product. <<Production method of magnesium alloy rolled material>> The above-mentioned magnesium alloy having a width of 1 000 mm or more and uniform mechanical characteristics in the width direction The rolled material is produced by rolling a magnesium alloy material by a roll mill. As shown in Fig. 1(A), the rolling mill is rolled by a rolling mill 3 from a magnesium alloy material sheet 1 fed from one of the winches 10a (10b). The material sheet 1 is taken up by the other-side winch 10b (10a), so that one process is performed once (one) roll (ONE PASS), and it is manufactured by performing multiple rolling. Here, in each rolling, reverse rolling in which the direction of rotation of each of the winches 10a (10b) is reversed is performed. In order to make

-18- S 201247336 The surface temperature of the magnesium alloy material sheet 1 is not lowered before and after the light rolling, and the protective cover 5 is disposed in the middle of the winch 10a (10b) and the rolling mill 3. Further, temperature detectors 4r' 4bf, 4bb for measuring the surface temperature of the material sheet 1 immediately before passing through the rolling mill 3 and before passing through the rolling mill 3 are provided. The manufacturing method of the present invention is characterized in that the rolling mill has three or more fields in the width direction, and temperature control is performed for each field so that the difference between the highest temperature and the lowest temperature in the width direction of the surface of the rolling mill is The magnesium alloy rolled material of the present invention can be obtained at a temperature below 1 °C. Hereinafter, this method will be described in detail. [Preparation of magnesium alloy material] (casting) First, the magnesium alloy material plate 1 is prepared. Such a magnesium alloy material sheet 1' is preferably a cast material (cast sheet) having the same composition as that of the above-described rolled material. The cast material is produced by a continuous casting method such as a twin roll casting method or a precision casting method. In particular, since the twin-roll casting method can perform rapid cooling and solidification, it is possible to reduce internal defects such as oxides and segregation, and it is possible to reduce the occurrence of cracks or the like when these internal defects are used as a starting point in plastic working such as rolling. phenomenon. That is, 'the two-roller casting method can be used to obtain a cast material excellent in rollability. In particular, when a magnesium alloy material having a large aluminum content is used, crystallization and segregation are likely to occur during casting, and even after casting, a process such as light rolling is performed, and crystallization and segregation tend to remain in the interior. In the case of the cast material obtained by the two-roller casting method, as described above, it is possible to reduce segregation and the like from -19 to 201247336, and therefore it is suitable as a magnesium alloy material. The thickness of the material to be formed is not particularly limited. However, if it is too thick, segregation is likely to occur. Therefore, it is preferably 10 mm or less, more preferably 5 mm or less, particularly preferably 4 mm or less. The width of the cast material is above l〇〇〇mm. The maximum width of the cast material that can be manufactured by the manufacturing equipment can be used. In the present example, the cast strip obtained by casting is taken up into a metal coil shape to be used as a cast magnesium alloy coil for use in the next process. When the coiling is performed, the temperature of the portion of the cast material, in particular, the portion to be coiled, is heated to 10 〇 (TC 〜 20 (the degree of TC, even if it is an alloy which is prone to cracking, such as AZ91 alloy) It can be easily flexed and easily wound up. (Melting treatment) Although the above-mentioned cast material can be rolled, it is also possible to carry out a melt treatment on the cast material before rolling to obtain The melted material is used as the magnesium alloy material plate 1. By the melt treatment, the homogenization of the cast material can be achieved. The conditions of the melt treatment are as follows: the holding temperature is 3 50 ° C or more, preferably It is 380 ° C ~ 420 ° C; the holding time is 30 minutes ~ 24 〇 0 minutes. The higher the aluminum content, the longer the holding time is better. In addition, in the cooling process after the above holding time, if using water cooling or When the cooling rate is increased by the forced cooling method such as blowing, it is possible to suppress the precipitation of coarse crystallization and obtain a sheet having excellent rollability. If the casting material for the length: strip is melted, As above In the case of a cast magnesium alloy coiled material, the cast material is first taken up into a shape of a magnesium alloy coil,

-20 - S 201247336, if it is melted again, it can be heated very efficiently [preheating] Rolling of the above-mentioned cast material or the magnesium alloy material that has been subjected to the above melt treatment And a magnesium alloy rolled material having desired mechanical properties is produced. In the case of rolling, in addition to improving the plastic workability (rolling property) of the magnesium alloy material, preheating may be performed so as not to cause a difference in the degree of rolling in the width direction. When the heating means such as the heating box 2 shown in Fig. 1(B) is used for the preheating, the heating can be performed once for the long magnesium alloy material sheet 1, and the workability is excellent. The heating box 2 is capable of accommodating a sealed container of the magnesium alloy material sheet 1 that has been wound into a roll shape, and supplies a hot air heated to a predetermined temperature to the container, and maintains the inside of the container at a desired temperature. Gas phase environment furnace. In particular, when the magnesium alloy material sheet 1 is directly pulled out from the heating box 2 and rolled, the time taken before the heated magnesium alloy material sheet 1 comes into contact with the rolling mill 3 can be shortened. Effectively suppressing: the temperature of the magnesium alloy material sheet 1 before the magnesium alloy material sheet 1 contacts the rolling mill 3 is lowered. Specifically, the heating box 2 is exemplified by a magnesium alloy material sheet 1 that can be taken up in a roll shape, and the winch 10 for feeding and winding the magnesium alloy material sheet 1 can be rotatably Support structure. The magnesium alloy material plate 1 is housed in such a heating box 2, and is heated to a specific temperature. In addition, Fig. 1(B) shows a state in which the magnesium alloy material sheet 1 that has been wound into a roll shape is housed in the case 21 of the heating - 21 to 24,736,536, and is actually used in a closed state, but For the sake of easy understanding, the system shows the state that will open the front. In the preheating step, heating is performed so that the temperature of the magnesium alloy material tends to be 300 ° C or less. The set temperature of the heating means such as the heating box can be selected to be in the range of 300 ° C or less, especially before the rolling is being performed, it is preferable to adjust the set temperature to: the surface temperature of the material is rolled once in one time. The process is maintained in the range of 150 ° C ~ 280 ° C. Here, if the magnesium alloy material is subjected to multiple rolling, the temperature of the magnesium alloy material tends to rise due to the heat energy generated by the processing. On the other hand, the temperature of the magnesium alloy material is lowered after the magnesium alloy material is re-rolled back and before being contacted to the rolling mill. Therefore, it is preferable to adjust the heating means in consideration of the rolling speed (mainly the traveling speed of the material during rolling), the distance from the heating means to the rolling mill, the temperature of the rolling mill, the number of rolling, and the like. Set the temperature to be appropriate. In general, the setting temperature of the heating means is preferably 150 ° C to 280 ° C, more preferably 20 (TC or more, especially 23 CTC to 2 80 ° C is relatively easy to use. As for the length of the heating time, although As long as the magnesium alloy material can be heated to a predetermined temperature, but for the magnesium alloy coil which has been wound into a roll, in order to reduce the temperature difference between the inner side and the outer side of the magnesium alloy coil, the most It is good to use sufficient heating time to make the temperature of the magnesium alloy coil material uniform. The other 'heating time is as long as the weight, size (width, thickness) of the magnesium alloy coiled material, winding number, etc. If the factors are set appropriately, it is sufficient to be preheated before passing through the rolling mill 3.

-22- S 201247336 The surface temperature of the magnesium alloy material sheet 1 does not vary in the width direction. It is preferable to cover the material sheet 1 with a protective cover 5 made of a heat insulating material. In particular, since the heating state of both end portions in the width direction of the material sheet 1 is difficult to maintain and it is easy to cool off, it is necessary to cover at least both end portions so that the temperature in the width direction does not cause a difference. By this means, it is easy to maintain a uniform rolling in the width direction by rolling in the subsequent direction, and it is not easy to cause the degree of rolling to be caused by the rolling of the magnesium alloy material sheet 1 before and after passing through the light rolling mill 3. The surface temperature of the magnesium alloy material sheet 1 was measured. These temperature detectors are respectively disposed between the rolling mill 3 and the winch 1 〇a, and between the rolling mill 3 and the winch 1 〇b. For example, in Fig. 1(A), if the traveling direction of the material sheet 1 from the left side of the paper surface to the right side is regarded as the outward traveling direction, the temperature detector 4bf disposed on the left side of the rolling mill 3 is used for detecting The surface temperature of the magnesium alloy material sheet 1 immediately before passing through the rolling mill 3 is placed on the temperature detector 4bb on the right side of the rolling mill 3 to detect the surface temperature of the rolled sheet immediately after passing through the rolling mill 3. On the other hand, if the traveling direction of the material sheet 1 from the right side of the paper surface to the left side is regarded as the returning direction, the temperature detector 4bf disposed on the right side of the rolling mill 3 is used to detect the magnesium immediately before passing through the rolling mill 3. The surface temperature of the alloy material sheet 1 and the temperature detector 4bb disposed on the left side of the rolling mill 3 are used to detect the surface temperature of the rolled sheet immediately after passing through the rolling mill 3. Before the rolling, the temperature detector 4bf is used to measure the surface temperature of the magnesium alloy material sheet 1 which has been preheated to the above temperature range. This -23-201247336 type of temperature detector 4bf, although it is a contact type detector that can be measured by contact with the material board 1, in order not to cause flaws on the material board i, a non-contact type detector is used. It is appropriate. The number and arrangement position of the temperature detectors 4bf can be appropriately selected as long as they can be individually measured at at least three places in the center portion and the both end portions in the width direction of the material sheet i. Its number and configuration location. For example, three temperature detectors 4 b f are disposed at the center portion and both end portions, and the temperatures of the respective portions are measured. As will be described later, if you want to control: the temperature difference between the two points of the width of the material sheet 1 (rolled sheet) at intervals of 100 mm, set a temperature every 100 mm apart for the width of the rolled sheet. The detector is OK. Then, based on the temperature measured by the detector 4bf, it is preferable to control the heating temperature of the preheating, the heating temperature of the auxiliary heating means such as a heat generating lamp to be described later, and the like. As a result, the temperature difference of the magnesium alloy material sheet 1 over the entire width direction can be easily reduced. It is preferable to arrange an auxiliary heating means (not shown) for reheating the magnesium alloy material sheet 1 in accordance with the measured temperature of the temperature detector 4bf. This auxiliary heating means may be exemplified by a heating means such as a heat generating lamp, which is disposed closer to the side of the winch 10a (l〇b) than the temperature detector 4bf. The number of the auxiliary heating means can be appropriately selected as long as it can be heated at least in two places at both end portions in the width direction of the magnesium alloy material sheet 1. In this way, it is difficult to maintain the heating state because of rolling, that is, the temperature control is performed individually at both ends which are easily cooled, so that the width can be reduced by -24-

S 201247336 The difference in temperature in the direction of the degree. By preheating the heat treatment including the reheating, the magnesium alloy material sheet 1 is preferably subjected to temperature control at the above set temperature to set the maximum temperature and the lowest temperature of the entire field in the width direction of the magnesium alloy material sheet 1. The difference in temperature is controlled below 8 °C, especially below 5 °C. As a result, even in the magnesium alloy material sheet 1 having a large width of 1000 mm or more, the difference in temperature in the entire width direction is small, and therefore, it is less likely to cause a difference in the degree of rolling of the magnesium alloy material sheet 1. Further, if the temperature difference between the two points of the magnesium alloy material sheet 1 at a distance of 10 〇 mm in the width direction is controlled to be 6 t or less, even if it is controlled to be 3 t or less, it is more preferable. By reducing the temperature difference between two points adjacent to each other, it is possible to easily control the difference in the overall temperature distribution of the magnesium alloy material sheet 1 in the width direction, and as a result, the magnesium alloy material sheet 1 can be more effectively reduced. The difference in the degree of rolling. [Rolling] The magnesium alloy material sheet 1 heated by the heating means of the heating box 2 is sent out from the heating box 2, and supplied to the rolling mill 3 to be rolled. Specifically, an example of a rolling line as shown in Fig. 1(A) can be cited. The rolling production line has a pair of winches l〇a, 10b which can be reversed, and is disposed between the pair of winches 10a, 1 Ob which are disposed separately to hold the magnesium alloy material in progress. A pair of rolls 3 (roller 3) arranged in opposite directions are formed in the form of the plate 1. After the wound-shaped magnesium alloy material sheet 1 is provided on one of the winches 10a, the roll is poured into -25-47347336, and one end of the magnesium alloy material sheet 1 is taken up by the other winch 1 Ob, so that The magnesium alloy material sheet 1 can travel between the two winches 10a, 10b. During this travel, it is sandwiched by the rolls 3, whereby the surface alloy material sheet 1 is rolled. In the example shown in Fig. 1(A), each of the winches 10a, 10b is housed in the heating boxes 2a, 2b, and the magnesium alloy material sheets 1 wound by the winches 10a, 10b are available. The heating boxes 2a, 2b are heated to perform heating. Then, the heated magnesium alloy material sheet 1 is inverted from one of the winches, and is discharged from the heating box* toward the other heating tank, and is taken up by the other winch. Here, both ends of the magnesium alloy material sheet 1 are wound around the respective winches 10a, 10b, and are wound around the ends of the magnesium alloy material sheets 1 on the winches 10a, 10b. The intermediate field is introduced into the rolling mill 3, and rolling is performed plural times. Each of the rolling is performed by reversing the direction of rotation of the winches 10a, 10b each time. That is, reverse rolling is performed. Therefore, the magnesium alloy material sheet 1 is not taken out from the winches 10a, 10b until the last rolling is performed. Further, the number of the rolling mills 3 in the first drawing is only one example, and a configuration in which a plurality of pairs of rolls (rollers) are arranged in the traveling direction of the magnesium alloy material sheet 1 may be employed. On the other hand, the surface temperature of the rolling mill 3 is heated to reach 23 (TC~29 (the range of TC. By heating to 23 °C or more, the material sheet 1 can be maintained in a sufficient heating state, so the material sheet can be kept at In the state of excellent plastic workability, it is possible to smoothly perform good rolling. By controlling the temperature to 290 ° C or lower, it is possible to suppress the coarsening of the crystal grain size of the material sheet 1 and the cause thereof.

-26- S 201247336 The smashing of the processing deformation introduced by rolling and rolling, which is excellent in manufacturability. In the temperature range described above, the temperature is controlled so that the highest temperature in the width direction of the surface and the temperature of the lowest temperature are not more than j °C. By reducing the width of the rolling mill 3 in the width direction, it is possible to reduce the difference in the degree of rolling in the width direction so that the mechanical properties of the magnesium alloy rolled material are in the width direction, and the rolled sheet can be effectively reduced. The difference in thickness is the difference in the thickness caused by the tape roll. The difference between the highest temperature and the lowest temperature in the width direction is better. Further, it is preferable to control the temperature difference of the rolling mill 3 at a distance from the width direction to 6 ° C or less, more preferably less. By reducing the temperature difference between two adjacent points to the overall temperature distribution in the width direction of the rolling mill 3, the distance between the two points of the rolling process of the magnesium alloy material sheet 1 can be more effectively reduced, although it is also possible It is set below 100mm], but the shorter it is, the easier it is to control the temperature difference in width, so it is better. The temperature of the rolling mill 3 can utilize the temperature detector L. The temperature detector 4r may be a contact type detector connected to the roll 3 or a number and a position of the non-contact type detector 4r as long as it is at least three places at the center portion and the both end portions of the rolling direction. , can be made into a stamping process to control the rolling mill surface coma to a temperature difference of 1 carcass. In other words, it can tend to be consistent. In addition, because this rolling mill 3 system is set at 5 °C and 100 mm, the two are controlled at 3 °C, and it is easy to control the difference, and the difference in the degree of the result. The overall tr on the 4 or 1 〇〇 mm direction is confirmed and touched to perform the measurement. Temperature Detector If the width of the roller 3 is measured, -27-201247336 can be appropriately selected for its number and configuration position. For example, an example in which the three temperature detectors 4r are disposed at the center portion and both end portions to measure the temperature of each portion can be mentioned. If the temperature difference is controlled for each interval of 1 〇〇 mm in the width direction of the rolling mill 3, the temperature detector corresponding to the width of the rolling mill is provided at intervals of 100 mm. can. Further, the temperature of the material sheet 1 immediately after passing through the rolling mill 3 is also confirmed by the temperature detector 4bb. It is preferable to carry out temperature control such as appropriately changing the heating temperature of the rolling mill 3 in accordance with the temperature measured by the temperature detector 4bb. As a result, the overall temperature difference in the width direction of the magnesium alloy material sheet 1 can be more easily reduced. According to the measurement by the temperature detector 4bb, the temperature difference between the two points at a distance of 100 mm in the width direction of the magnesium alloy material sheet 1 may be 6 ° C or less, and more preferably 3 ° C or less. Further, the entire material sheet 1 that has been wound into a roll shape is compared with a part of the material sheet 1 that has been rewinded, and its heat capacity is large. Therefore, when the above-described conveyance or installation is performed, the temperature is not easily lowered. In contrast, the amount of temperature reduction from the winch 1 〇 or the supply device until it comes into contact with the rolling mill 3 tends to be relatively large. The reason is because, as described above, it is only a part of the material, the heat capacity is small, and the magnesium alloy is a metal excellent in thermal conductivity, so it is easy to cool. The extent to which the temperature of the material sheet 1 before the contact with the rolling mill 3 is lowered is affected by the thickness of the material sheet 1, the traveling speed of the material sheet 1, and the like, and the thinner the sheet thickness, or the slower the rolling speed, the Temperature

-28- S 201247336 Easy to reduce. Preferably, the material sheet 1 is supplied to the rolling mill before the surface temperature of the material sheet 1 is lower than 170 ° C, more preferably at 18 or more, particularly preferably above 210 ° C. 3 is preferable. In addition, the rotation speed (peripheral speed) of the rolling mill can be appropriately adjusted according to the traveling speed of the material, for example, 5 meters/minute to 200 meters/minute, which can be efficiently performed. In order to control the temperature of the surface of the rolling mill 3 in the above-described manner, the rolling mill 3 has three or more fields in the width direction, and performs temperature control for each field. For example, this means: There is a heater (heater type) called a "cartridge heater": a liquid such as heated oil (heat medium oil) is introduced into the rolling mill, or the liquid is allowed to be carried out inside the roll. Circulation (liquid circulation type): a method of directly attaching a heating fluid whose temperature has been adjusted to a roll. A specific means for directly attaching a heating fluid to the rolling mill 3 is to blow a gas such as hot air to Roller 3 body (hot (Formula): A method of applying a lubricant or the like described later. Among these, in particular, the heated oil is circulated inside the rolling mill 3 to heat the roll, and the width direction and the circumferential direction of the rolling mill 3 are used. The heating liquid can be completely charged, and therefore, the inside of the rolling mill 3 can be quickly controlled to a predetermined temperature for each of the above fields, and the difference between the highest temperature and the lowest temperature in the width direction of the roll can be easily made.値 is controlled within the above range. The temperature of the liquid to be circulated varies depending on the size (width, diameter) and material of the rolling mill 3, the width and position of the above-mentioned field, but is the surface set by the rolling mill 3. The degree of temperature +1 CTC is appropriate. To promote the above-mentioned liquid to circulate -29-201247336, it is possible to use a liquid circulation mechanism which is used for applications such as water-cooled copper. Others, in order to reduce the width direction of the rolling mill 3 The difference in temperature, if it is a heater method, it is best to adjust the heaters in each of the above areas. In other words, it is preferable to store the number of heaters in the center portion of the roll which is relatively easy to maintain the heating state, and the number of heaters to be accommodated in the end portion where the heating state is difficult to maintain, or must be different or necessary The temperature of the heater is changed. The electrical connection between the heater side and the power source side on the rotating shaft of the rolling mill 3 can be performed by using a sliding contact. If the hot air type is used, it can be adjusted by: The temperature of the gas, the amount of the blowing, the number of the outlets, the arrangement position of the outlet, etc. In each rolling process, the rolling ratio of each of the ONE PASS rolls can be appropriately selected. The roll rate of milk is preferably 10% or more and 40% or less. The total rolling rate is preferably 75% or more and 85% or less. With such a roll rate, the material is multiplied several times (multiple passes). Rolling can not only roll to a desired thickness, reduce the average crystal grain size, and improve press workability, but also suppress the occurrence of surface cracks. When rolling is used, it is suitable if the lubricant is used to reduce the friction between the rolling mill and the material and to perform good rolling. The lubricant can be applied to the rolls as appropriate. However, depending on the type of lubricant, there are occasions when some lubricant remaining on the material is burnt in the next preheating process because it is heated or heated by contact with the rolls. The metamorphic layer. Moreover, if there is such a metamorphic layer, the material cannot be uniformly rolled by the uniform sentence, and the thickness -30-201247336 will be inconsistent, because the difference in thickness causes the material to snake, in a certain direction. Tilting (cross-flow phenomenon), as a result, it is easy to cause an increase in the amount of deformation of the winding. Further, although the detailed machine transition is not conclusive, the lubricant is more likely to remain on the both edge sides than the center portion in the width direction of the material. Therefore, considering the maximum enthalpy of the heating temperature of the rolling mill: 290 ° C, and additionally giving it some allowance, the lubricant is preferably a lubricant which does not form a deteriorated layer even at a temperature of 300 ° C. Further, in order to prevent such a part of the lubricant or the deterioration layer from being locally present on the material, it is preferable to uniformly distribute the lubricant on the surface of the material immediately before supplying the material to the rolling mill. For example, on the upstream side of the rolling mill, a uniform dispensing means such as a bristles or a blade is preliminarily disposed, and the amount of lubricant applied to the surface of the material can be uniformly uniformized. In order to adjust the tension applied to the material sheet 1 during the rolling, a pinch roller (not shown) may be disposed in front of and behind the rolling mill 3. In order to prevent the temperature of the material from being lowered by contact between the material and the pinch roller, the pinch roller is preferably heated to a temperature of from 200 ° C to 250 ° C. (Winding) The rolled sheet obtained by the above rolling is wound into a roll shape. Then, a series of steps such as the preheating step, the rolling step, and the winding step are continuously and repeatedly performed, and after the desired number of rollings are completed, the obtained rolled sheet (magnesium alloy sheet) is finally It is taken up in a coil shape. In the magnesium alloy sheet constituting such a coiled material, there is a processing deformation (shear deformation region) introduced into the metal structure by rolling. Since the above-mentioned magnesium alloy sheet is subjected to plastic working such as press working, it is dynamically recrystallized, and thus the plastic workability is excellent. In particular, in the last rolling, the temperature of the rolled sheet immediately before the winding is maintained at a temperature at which recrystallization does not occur, and specifically, it is maintained at 15 (TC or less) for winding. A magnesium alloy sheet excellent in flatness can be obtained, and a structure in which the above-described processing deformation is sufficiently retained can be obtained. In order to maintain the temperature at which the re-crystallization does not occur, the rolled sheet before being wound up can be adjusted by adjusting the material. In the case where the rolling speed is cooled by forced cooling such as blowing, the temperature can be set to a predetermined temperature in a short period of time, and the workability is excellent (correction step). The material can be directly used as a product (a representative example is a material of a magnesium alloy material called "plastic material"). In addition, the coil material can be rewinded and rolled. The predetermined deflection of the plate is performed to correct the machining deformation introduced by the rolling. When correcting, the roller straightening machine can be suitably used. Having a pair of rollers arranged in opposite directions, the material is interposed between the pair of rollers to impart a flexible region to the material. Especially suitable for use: the plurality of rollers are arranged in a zigzag staggered shape and will be rolled The plate passes through between these rollers, and the roller straightener can be repeatedly imparted to the rolled sheet by the deflection. By performing such correction, not only a magnesium alloy sheet having more excellent flatness but also the above-described processing deformation is sufficient. Exist, called "-32-

S 201247336 Pressing is excellent in plastic workability. Further, the roller is provided with a heating means such as a heater, and when the heated roller is used to perform the temperature correction for imparting deflection to the rolled plate, cracks or the like are less likely to occur. The temperature of the above roller is preferably 300 t or more. The adjustment of the amount of deflection by the correction is adjusted by adjusting the size and number of the rollers, the interval (gap) between the rollers arranged in the opposing direction, and the interval between the rollers adjacent to each other in the direction in which the material is advanced. Come on. It is also possible to preheat the magnesium alloy sheet (rolled sheet) to be used as material before the correction is performed. The specific heating temperature is, for example, 10 ° C or more and 250 ° C or less, more preferably 200 ° C or more. The magnesium alloy sheet which has undergone the correction process can be used as a product (a representative example of a material of a magnesium alloy material called "plastic material"). Further, in order to make the surface state better, surface honing can be performed by using a honing belt or the like. <Operation and Effect> According to the method for producing a magnesium alloy rolled material and a magnesium alloy rolled material according to the above embodiment, the following effects can be obtained. (1) Magnesium alloy rolled material having a width of 100 mm or more in width and mechanical characteristics are substantially uniform in the width direction. Therefore, when plastic working is performed on such a rolled material, substantially uniform processing can be performed regardless of which place is processed. (2) Since the mechanical properties in the width direction are uniform, even if one piece of the rolled material is divided in the width direction, a magnesium alloy rolled sheet having a narrow width of a plurality of sheets of -33 to 201247336 is produced. It is also possible to obtain a rolled material having the same mechanical properties. (3) According to the above manufacturing method, by reducing the temperature difference of the entire rolling mill in the width direction, even if the width is 1 000 mm or more, the difference in the degree of rolling in the width direction can be reduced. Therefore, a magnesium alloy rolled material having a width of 1 000 mm or more and uniform mechanical properties in the width direction can be produced. <Test Example> As a test example, the next magnesium alloy rolled material was produced, and the mechanical properties thereof were examined. First, a two-roller casting method is used to produce a magnesium alloy material sheet containing a composition of the mass ratio of aluminum, an aluminum, a mass%, a zinc equivalent to an az9 1 alloy, and a magnesium content of 3.0% by mass. Aluminium 1.0 material II%, zinc equivalent to the composition of the AZ3 1 alloy magnesium alloy material plate. Each of these panels has a plate thickness of 5.0 mm, a plate width of 1,020 mm, and a length of 1,000 mm. For each of these samples, a melt treatment was carried out for 20 hours at 4 ° C before rolling. Then, the samples 1 to 3 made of the AZ91 alloy and the samples 4 to 6 made of the AZ31 alloy were produced by rolling under the following conditions. (Rolling conditions) • Multiple rolling (rolling) was carried out, and the rolling ratio was 15 to 25%/pass rolling. • Final thickness: Rolling up to 1.0 mm (width: -34-

S 201247336 1 020mm ), total rolling rate: 80%. • Preheating of the material board (in the heating furnace, heating time: 30 minutes). • Heating method of the rolling mill: heating from the outside of the roll. The heating method of the rolling mill is carried out by dividing the width direction of the rolling mill into three fields evenly, by directly applying a lubricant having a temperature adjusted in these three fields. For the sample 1, the lubricant applied to the center of the three fields has been adjusted to 250 ° C ~ 255 ° C, for the two sides of the lubricant has been adjusted to 255 ° C ~ 260 ° C, so that the roll surface The temperature tends to be uniform in the width direction. On the other hand, for the sample 4', the central application has been adjusted to 23 (TC~23 5 ((: Lubricant' for the two sides of the smear has been adjusted to 2 3 5 °C ~ 2 4 01 lubricant, In order to make the surface temperature of the rolls tend to be uniform in the width direction. When rolling is performed, it is measured in the following manner: the surface of the magnesium alloy material sheet immediately before the rolling, the surface of the rolling mill, just passed the roll The temperature of the surface of the rolled magnesium alloy sheet after rolling. In the field of contact with the material sheet on the surface of the rolling mill, an arbitrary straight line is taken along the width direction of the roll (the direction parallel to the axial direction). And measuring the temperature of the complex point on the straight line. Here, for each surface of the magnesium alloy material plate 'rolling mill, magnesium alloy rolled material, take out one of the above-mentioned arbitrary straight lines, on this straight line, From the one end in the width direction, a point of 10 mm is counted, and from this point, the point 取 is taken at a distance of 00 mm each time to take 11 points in total, and the temperature of each point is measured by a non-contact type temperature detector. Time The temperature in the width direction of the rolling mill, in order not to measure the temperature of the lubricant itself, is for the surface of the rolling mill, -35- 201247336 to measure the temperature in the field not sprayed by the lubricant.値 is shown in Tables 1 to 3. [Table 1] Sample No. Upper section: Surface temperature of Mg alloy material plate (°C) Lower section: Temperature difference between 2 points (°C) Maximum temperature and bottom temperature measurement location (mm) 10 110 210 310 410 510 610 710 810 910 1010 1 251 255 257 255 257 256 258 256 255 253 250 8 4 ; 2 j 2 i 2 j ; 2 j 2 j 1 j 2 i 3 2 243 249 257 256 258 260 263 259 258 250 236 27 6 ! 8 ! | 2 | 2 | 3 Μ [8 j 14 3 281 275 259 255 252 250 251 256 259 272 288 38 4 | 16 Η 3 丨 2 jj 5 j 3 j 13 j 16 4 225 230 232 230 231 232 230 231 232 228 224 8 5 j 2 | 2 I j ! 2 j MM { 4 5 212 220 231 231 232 231 231 229 224 215 210 22 8 j 11 ί 0 |, lj 0 ! 2 | 5 | 9 j 5 6 245 239 232 229 230 229 231 229 232 239 243 16 6 | 7 | 3 | i 2 i 2 i 3 丨7 丨 4 [Table 2] Sample No. Upper: Roller surface temperature (°c) Lower section: Temperature difference between 2 o'clock (°C) Maximum temperature and bottom temperature measurement location (mm) 10 110 210 310 410 510 610 710 810 910 1010 1 249 250 252 250 251 253 252 250 251 250 248 5 1 ! 2 j 2 !. I 2 I j 2 j | 2 2 241 248 247 252 256 256 255 253 248 243 238 18 7 ! j 5 ! 4 | 0 ! | 2 | 5 j 5 j 5 3 250 249 251 252 250 253 251 251 250 251 250 4 1 j 2 | 1 j 2 j 3 ! 2 j 0 j · ! 1 j 1 4 228 229 232 231 231 232 231 230 230 230 229 4 1 |3|1|〇|1| 1|1||〇|〇|1 5 220 229 226 231 234 235 234 233 229 223 218 17 9 |3|5;3|1|1|1|4|6| 5 6 229 229 232 232 231 233 232 231 232 231 230 .4 〇|3|〇|1|2|1|1|1|1| 1 -36-

S 201247336 [Table 3] Sample No. Upper section: Surface temperature of Mg alloy rolled sheet (. Lower section: Temperature difference between 2 points (. 〇 Maximum temperature, lowest temperature measurement point (mm) 10 110 210 310 410 510 610 710 810 910 1010 1 250 254 255 256 254 255 257 255 253 252 249 8 4 | 1 2 j I 2 j 2 j 2 j 1 j 3 2 242 247 251 254 257 258 258 253 256 248 235 23 5 | Μ 3 ! 3 ί | 0 | 5 j 3 j 8 ! 13 3 260 267 255 254 252 253 252 2S4 257 262 270 18 7 ] 12 | 1 ! 2 jj 2丨3丨5丨8 4 226 230 233 231 231 j 231 230 231 232 229 226 7 4 1 3 I 2 1 0 1 0 1 I 3 j 3 5 215 225 229 232 234 233 234 231 223 218 212 22 10 i Μ 3 I 2 jj 3 { 8 { 5 i 6 6 241 237 231 230 1 230 232 232 230 233 237 240 11 4 | 6 ! |0) 2|0) 2|3|4| 3 [Mechanical characteristics evaluation] For the samples 1 to 6 of the obtained magnesium alloy rolled material, The following various characteristics were evaluated. [Bottom-to-bottom ratio] The ratio of the bottom-to-side ratio of the samples 1 to 6 was measured based on the peak intensity of the X-ray diffraction. This measurement is performed by X-ray diffraction on the surface of a portion of 50 mm (end portion), 500 mm (center portion), and 95 mm (end portion) from one end in the width direction of each sample, and obtains (002) The peak intensity of the surface, the (1) plane, the (101) plane, the (102) plane, the (1 1 0) plane, and the (1 03) plane. From the results, the ratio of the peak-to-edge ratio of the end portion to the center portion was 0E and 0c, and the ratio 〇E/〇c was also obtained. The peak-to-peak ratio of the bottom surface is 0C and 0E, and the peak intensity of the X-ray diffraction at the central portion and the end portion is Ic (002), Ic -37-201247336 (Ϊ00), Ic(101), respectively. , IC(102), Ic(ll〇), IC(103) ' ( 002) > IE ( 100) , IE (101) ' IE ( 102 ) , IE ( 1 1 〇 ) , I e ( 1 0 3 When it is expressed, it is expressed by the following formula. Bottom peak-to-peak ratio Oc : Ic ( 002 ) / { Ic ( 100 ) + IC ( 002 ) + Ic ( 101 ) + IC ( 102 ) + IC ( 110 ) + Ic ( 103 ) } Surface peak ratio 〇 e: Ie (002) / { Ιβ ( 100) + iE ( 002) + Ie ( 101 ) + IE ( 102 ) + IE ( 110 ) + Ie ( 103 ) } and the results are shown in Table 4. [Average crystal grain size] The average crystal grain size of the samples 1 to 6 was measured in accordance with "Microscopic test method for crystal grain size of steel specified in Japanese Industrial Standard JIS G 055 1 (2005)". In the measurement, the portion perpendicular to the rolling direction is 50 mm (end portion), 510 mm (center portion), and 97 mm (end portion) from one end in the width direction of the sample. Face to measure. From the results, the average crystal grain size ratio DE/DC between the end portion and the center portion was obtained. The results are shown in Table 4. [Tensile test] The elongation, tensile strength, and 0.2% of the endurance of the samples 1 to 6 were measured in accordance with "Metal material tensile test method" as defined in Japanese Industrial Standard JIS Z 2241 (1998). In the measurement, the first part is: 50mm (end part), 510mm (central part), 970mm (end part) from the one end in the width direction of the sample, and cut out according to Japanese industry.

-38- S 201247336 JIS No. 13 1 (1 998) JIS No. 13B The long side of the test piece is in the rolling direction, and the tensile test is performed for this line. From the results, the end-to-center ratio Ee/Ec, the tensile strength ratio TsE/Tsc, and the 0.2% endurance t丨〇 were obtained and the results were shown in Table 5° test piece (test piece). Elongation of the entrance; Pse/Psc -39- 201247336

Crystalline particle size ratio (de/dc) 970/510 0.981 I 0.677 I 0.980 II 0.714 I 1.804 50/510 0.981 I 0.662 II 1.618 I 0.980 0.696 1.696 Crystal size -? Pack 1 § CNJ in inch · inch · LO σ> 5 τ-· 1 510 | CO in in cb in IT) o in CO in CO in S CM in CO xr σ> CO σ> 7 CO in σ> i 〇 S S 950/500 oo I 1.166 I 丨0·86 (Π 〇I 1191 I 0.848 50/500 1.002 1.158 0.895 1.001 0.866 Bottom peak 値 旦 950 0.861 I 0.988 II 0.730 I 0.711 1 0.830 1 0.597 1 0.860 I 0.847 | 0.849 0.710 1 0.697 1 0.704 S 0.862 0.981 0.760 Γ 0 -711 | 0.825 0.610 Sample No. CM co ιο CO -40 s 201247336 [i] Elongation ratio (Ee/Ec) 970/510 0.917 I 0.615 I 0.833 I 0.944 II 0.778 I 0.800 50/510 0.833 I 0.769 I 0.833 1.000 I 0.611 | 0.850 Elongation (%> im § Exhibit > 00 o Bu <DT - 〇CSi τ - CO r- CM 00 00 s S Ο Ο τ- 〇00 T-T- Bu T- €- w 970/510 I 0.985 1.103 I 0.894 | I 0.987 I 1.103 0.890 50/510 I 0.991 II 1.044 | 0.897 I 0.993 I 1.055 I 0.903 拉伸 Stretching Degree (MPa) 蒺〇 ai Ο CO CO ΙΟ C0 CNJ § CM CM CO JO CNJ 〇LO ΙΟ C0 CO τ — CM CO CO s CO CNJ σ> CNJ σ> Another S CNJ C0 C0 ιο CO CO CO CO s CO GO σ> CM 0.2% endurance ratio (Ps^/Psc) 970/510 0.985 1.102 I 0.898 II 0.992 I 1.102 0.897 50/510 I 0.993 II 1.059 II 0.902 | I 0.996 | I 1-058 | 0.893 0.2% Endurance (MPa ) 〇 η η (Ο CSJ o 00 CNJ 00 CO CSJ CO CO CM CSJ Ο TF-CSJ Ο ΙΟ σ > (Ο CSJ s eg in to CNJ 00 CO <N lh CM CM inch CO CNJ s Γ ΙΟ c\j σ><Ώ CM a> co CNJ CO CNJ 00 CO CNj σ> s sample No. τ—CSJ co inch in <c -41 - 201247336 [Results] From the above results, it can be known that the width is 1000 mm or more When the magnesium alloy material having a large width is rolled, the difference in the degree of rolling in the width direction (inconsistency) can be reduced by reducing the temperature difference in the entire width direction of the surface of the rolling mill. In addition, if the temperature difference in the entire width direction of the surface of the magnesium alloy material is also reduced before the rolling, the difference in the degree of rolling (inconsistency) can be further reduced, and the magnesium alloy can be obtained. The material is uniformly rolled in the width direction. In such a manner as to reduce the difference (inconsistency) in the degree of rolling, a magnesium alloy rolled material having uniform mechanical properties in the width direction can be obtained. In addition, the above-described embodiment can be appropriately modified without departing from the gist of the present invention, and is not limited to the above-described configuration. [Industrial Applicability] The magnesium alloy rolled material of the present invention It can be suitably used as: components of various types of motor and electronic equipment, especially housings of portable or small-sized motor and electronic equipment; and components of various technical fields that are required to have high strength, such as automobiles, airplanes, etc. The material of the components of the transportation machine. The method for producing a magnesium alloy rolled material according to the present invention is suitably used for producing a magnesium alloy rolled material having a width of 1 000 mm or more and a uniform mechanical characteristic in the width direction. -42-

S 201247336 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a manufacturing process of a magnesium alloy roll milk material according to an embodiment of the present invention, and Fig. 1 (A) is a schematic explanatory view showing an example of a light rolling mill production line; (B) is an explanatory diagram of a heating box for preheating magnesium alloy material. [Explanation of main component symbols] 1: Magnesium alloy material plate 2, 2a ' 2b: Heating box 3: Roller (roller) 4bf, 4bb 4r: temperature detector 5: protective cover 10, 10a ' 10b: winch - 43-

Claims (1)

201247336 VII. Patent application scope: 1. A magnesium alloy rolled material obtained by rolling a magnesium alloy material by a rolling mill, characterized in that: the width of the magnesium alloy rolled material is 1000 mm or more, in the above magnesium X-ray diffraction peaks at the (002) plane, (100) plane, (101) plane, (102) plane, (1 10 ) plane, and (103) plane of the center portion in the width direction of the alloy rolled material The 値 intensity is Ic(002), IC(100), Ic(l〇l), ic(102), Ic(1 10), Ic(103), and the X-ray diffraction of the aforementioned faces at the ends The peak intensity is Ie ( 002 ), IE (100), 1 "101), 1 "102), IE (110) ' IE ( 1 03 ) > when the bottom and bottom of each of the central portion and the end portion When the following equation is used for 0C and 0E, the peak-to-peak ratio 〇c : Ic ( 002) / { Ic ( 100 ) + IC ( 002 ) + IC ( 1〇ι ) + ic ( i〇 2 ) + lc ( 1 〇〇) +ic ( i〇3) }, the bottom peak ratio 〇E: Ie( 002) /{IE(100) +Ie(002 )+Ie(1〇1)+Ie(1〇2)+Ie (11〇)+Ie(1〇3) }, the ratio of the peak-to-bottom ratio of the end portion to the central portion is 0E/0C in accordance with 0-89$oe/Oc The relationship of 1.15. 2. The magnesium alloy rolled material according to claim 1, wherein Φ' in the central portion and the end portion has an average crystal grain size of Dc in a cross section orthogonal to the rolling direction, In the case of DE, the average crystal grain size ratio DE/DC of the end portion and the central portion is in accordance with the relationship of -44-S 201247336 0.7 S De/Dc S 1.5 . 3. The magnesium alloy rolled material according to the first or second aspect of the invention, wherein, in the central portion and the end portion, when the elongation of the tensile test in the rolling direction is Ec or Ee, respectively, The elongation ratio Ee/Ec of the end portion and the central portion is in accordance with the relationship of 2/3 SEe/EcS3/2. 4. The magnesium alloy rolled material according to claim 1 or 2, wherein, in the central portion and the end portion, the tensile strength of the tensile test in the rolling direction is Tsc and TsE, respectively. The tensile strength ratio TsE/Tsc between the end portion and the central portion is in accordance with the relationship of 0.9 STsE/TscS 1.1. 5. The magnesium alloy roll-rolled material according to the first or second aspect of the invention, wherein the center portion and the end portion have a tensile test of 0.2°/ in the rolling direction. When the endurance is Psc or PsE, the 0.2% endurance ratio PsE/Psc of the end portion and the central portion is in accordance with the relationship of 0.9SPse/PscS1_1. 6. The magnesium alloy roll-rolled material according to the first or second aspect of the invention, wherein the magnesium alloy material contains aluminum: 5% by mass or more and 12% by mass or less. A magnesium alloy member which is produced by plastic working a magnesium alloy rolled material as described in the first to sixth aspects of the patent application. A method for producing a magnesium alloy rolled material, which is obtained by rolling a magnesium alloy material by a rolling mill to produce a magnesium alloy rolled material, which is characterized in that: -45- 201247336, the width of the magnesium alloy material is 1 000 mm or more. The rolling mill has three or more fields in the width direction, and performs temperature control for each of the foregoing fields such that the difference between the highest temperature and the lowest temperature in the width direction of the surface of the rolling mill is 1 (TC = 〇 9. The method for producing a magnesium alloy rolled material as described in claim 8 wherein the temperature control is carried out by attaching a temperature-adjusted heating fluid to the surface of the rolling mill. The method for producing a magnesium alloy rolled material according to Item 8 or 9, wherein the temperature control is performed by introducing a temperature-adjusted heat medium oil into the rolling mill. The method for producing a magnesium alloy rolled material according to Item 8 or 9, wherein the temperature control is such that the surface of the rolling mill is separated by 100 mm in the width direction. The temperature difference between the two points is controlled to be lower than 6 ° C. 1 2. The method for producing a magnesium alloy rolled material according to claim 8 or claim 9, wherein the preheating is performed first. The difference between the highest temperature and the lowest temperature in the width direction of the surface of the aforementioned magnesium alloy material immediately before passing through the foregoing rolling mill is 8 ° C or less. 13. The magnesium alloy roll as described in claim 1 In the method for producing a rolled material, the preheating is performed so that the difference between the highest temperature and the lowest temperature in the width direction of the surface of the magnesium alloy material immediately before passing through the foregoing rolling mill is 8 ° C or less. The method for manufacturing a rolled metal material of the magnesium alloy roll-46-S 201247336 according to claim 8 or claim 9, wherein the preheating is performed first to make the surface of the aforementioned magnesium alloy material before the rolling mill The temperature difference between the two points of the width of 100 mm is controlled as follows. The temperature control is such that the temperature difference of the surface of the alloy roll of the alloy roll immediately after passing through the aforementioned rolling mill is 100 mm in the width direction is controlled below 6 ° C. 15) The method for producing a magnesium alloy according to claim 11, wherein the preheating is performed so that two points of the surface of the magnesium alloy material before the pass rolling mill are at a width of 100 mm. The temperature difference is controlled as follows, and the temperature control is performed such that the temperature difference of 100 mm in the width direction of the surface of the alloy roll immediately after passing through the above rolling mill is controlled to be 6 ° C or less. In the method for producing a magnesium alloy according to Item 12, the preheating is performed so that the temperature difference between the two points of the surface of the magnesium alloy material before the pass rolling mill at a width of 100 nm is controlled to be 6. (The following is a temperature control in which the temperature difference of the surface of the alloy roll after the above-mentioned rolling mill is separated by 100 mm in the width direction is controlled to 6 X: or less. 1 7 . The method for producing a magnesium alloy according to item 3, wherein the temperature difference is first pre-heated so that the temperature difference between the two points of the surface of the magnesium alloy material before the opening of the L machine is 100 mm or less at 6 ° C or less. , that is, the rolled material of the two points of the above-mentioned magnesium which is divided by the direction of the above-mentioned rolling points of the above-mentioned two points of the magnesium, which are separated by the aforementioned rolls, and the two points of the above-mentioned magnesium which are separated upward by the aforementioned rolls The above-mentioned roller is separated upwards -47-201247336 The temperature control is such that the temperature difference between the two points of the surface of the magnesium alloy rolled material immediately after passing through the aforementioned rolling mill separated by 10 mm in the width direction is controlled at 6°. C is carried out below. -48- S