WO2010087074A1 - Rolled plate and method of manufature thereof - Google Patents

Rolled plate and method of manufature thereof Download PDF

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Publication number
WO2010087074A1
WO2010087074A1 PCT/JP2009/070640 JP2009070640W WO2010087074A1 WO 2010087074 A1 WO2010087074 A1 WO 2010087074A1 JP 2009070640 W JP2009070640 W JP 2009070640W WO 2010087074 A1 WO2010087074 A1 WO 2010087074A1
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Prior art keywords
rolled sheet
rolled
plate
rolling
rolled plate
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PCT/JP2009/070640
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French (fr)
Japanese (ja)
Inventor
正禎 沼野
龍一 井上
伸之 奥田
望 河部
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住友電気工業株式会社
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Publication of WO2010087074A1 publication Critical patent/WO2010087074A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H8/00—Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects, e.g. checkered sheets
    • B21H8/02—Rolls of special shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H8/00—Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects, e.g. checkered sheets

Definitions

  • the present invention relates to a rolled plate made of a magnesium alloy that can be suitably used for a casing of a portable electric device and the like, and a manufacturing method thereof.
  • Magnesium alloys containing various additive elements in magnesium have been used as materials for casings of portable electric devices such as mobile phones and notebook computers and members of automobile parts.
  • one of the objects of the present invention is to provide a plate material made of a magnesium alloy, which is thin but has high rigidity, and a method for manufacturing the same.
  • the present invention is a rolled plate made of a magnesium alloy, comprising a plate-like rolled plate main body and a ridge formed integrally with the main body, and this ridge is 10 times or more the thickness of the rolled plate main body. It has the length of.
  • the protrusions integrated with the rolled sheet main body and having a length 10 times the thickness of the rolled sheet main body serve as ribs in the rolled sheet, the rigidity of the rolled sheet can be greatly improved. Therefore, the rolled sheet of the present invention has high rigidity even if the thickness of the rolled sheet body is reduced.
  • the protrusions when the protrusions are integrated with the rolled plate body, the protrusions can be included in a portion deformed by the processing when performing secondary processing such as press processing on the rolled plate.
  • At least one protrusion intersects an arbitrary straight line perpendicular to the length direction of the protrusion on the rolled sheet. If at least one ridge intersects an arbitrary straight line perpendicular to the length direction of the ridge, any ridge will bend even if an attempt is made to bend the rolled sheet using the above arbitrary straight line as a bending allowance. Therefore, it becomes a rolled sheet that is difficult to bend, that is, a highly rigid rolled sheet.
  • the cross-sectional shape of the protrusion is rectangular.
  • the height of the protrusion is equal to or greater than the thickness of the rolled plate body. According to this configuration, the strength of the rolled plate can be improved.
  • the Al content is preferably 8.3 to 9.5% by mass. According to this configuration, it is possible to obtain a rolled sheet having excellent mechanical properties such as strength and difficulty in cracking during plastic deformation and corrosion resistance.
  • the present invention is a method for producing a rolled plate by rolling a material made of a magnesium alloy with a rolling roll, and the rolling roll has a configuration having a groove on its outer periphery, and the material is rolled with this rolling roll.
  • rolling is made of a magnesium alloy having a plate-like rolled plate body and a protrusion formed integrally with the rolled plate body, and the protrusion has a length of 10 times or more the thickness of the rolled plate body.
  • a board is manufactured. According to this configuration, the protrusions can be formed integrally with the plate material with high productivity.
  • the concave grooves are preferably provided along the circumferential direction of the rolling roll. According to this structure, the protrusion along the rolling direction of the rolled sheet can be easily formed.
  • groove is provided in parallel with the width direction of a rolling roll.
  • the ridges orthogonal to the rolling direction can be formed in parallel with a predetermined interval in the rolling direction.
  • the rolled plate of the present invention has a high strength even if it is thin because the ridges are formed on the rolled plate body. Therefore, if the rolled plate of the present invention is used as a casing of a portable device, the weight of the device can be reduced while satisfying the strength required for the device.
  • FIG. 1A is a perspective view of a rolled sheet of the present invention, and shows a rolled sheet provided with a plurality of series-length protrusions arranged in parallel.
  • FIG. 1B is a perspective view of the rolled sheet of the present invention, and shows a rolled sheet provided with a plurality of ridge groups composed of a plurality of ridges arranged in a straight line.
  • FIG. 2A is a partial cross-sectional view of the rolled sheet of the present invention obtained by cutting the rolled sheet of the present invention in a direction orthogonal to the direction in which the protrusions are formed, and shows a rolled sheet having protrusions having a rectangular cross section.
  • FIG. 1A is a perspective view of a rolled sheet of the present invention, and shows a rolled sheet provided with a plurality of series-length protrusions arranged in parallel.
  • FIG. 1B is a perspective view of the rolled sheet of the present invention, and shows a rolled sheet provided with
  • FIG. 2B is a partial cross-sectional view of the rolled sheet of the present invention obtained by cutting the rolled sheet of the present invention in a direction orthogonal to the direction in which the protrusions are formed, and shows a rolled sheet having protrusions having a triangular cross section.
  • FIG. 2C is a partial cross-sectional view of the rolled sheet of the present invention obtained by cutting the rolled sheet of the present invention in a direction orthogonal to the direction in which the protrusions are formed, and shows a rolled sheet having a trapezoidal protrusion in the cross section.
  • FIG. 2D is a partial cross-sectional view of the rolled sheet of the present invention obtained by cutting the rolled sheet of the present invention in a direction perpendicular to the direction in which the protrusions are formed, and shows a rolled sheet having a projected dome-shaped protrusion.
  • FIG. 3A is a schematic view of a rolling roll and a rolled plate produced using the rolling roll, and shows a case where a rolling roll having a groove formed along the circumferential direction of the rolling roll is used.
  • FIG. 3B is a schematic view of a rolling roll and a rolled plate produced using the rolling roll, and shows a case where a rolling roll having a groove formed in parallel to the axial direction of the rolling roll is used.
  • Drawing 4 is an explanatory view about the method of measuring the amount of deflection of the test piece cut out from the rolled sheet concerning an embodiment.
  • the present invention is a rolled plate made of a magnesium alloy, comprising a plate-like rolled plate main body and a ridge formed integrally with the main body, and this ridge is 10 times or more the thickness of the rolled plate main body.
  • a length of a magnesium alloy comprising a plate-like rolled plate main body and a ridge formed integrally with the main body, and this ridge is 10 times or more the thickness of the rolled plate main body.
  • the protrusions integrated with the rolled sheet main body and having a length 10 times the thickness of the rolled sheet main body serve as ribs in the rolled sheet, the rigidity of the rolled sheet can be greatly improved. Therefore, the rolled sheet of the present invention has high rigidity even if the thickness of the rolled sheet body is reduced.
  • the protrusions when the protrusions are integrated with the rolled plate body, the protrusions can be included in a portion deformed by the processing when performing secondary processing such as press processing on the rolled plate.
  • ⁇ Overall configuration of rolled sheet> It can be easily understood by examining the physical properties of the rolled sheet that the rolled sheet of the present invention is obtained by rolling. Typical physical properties include the structure of the rolled plate, tensile strength, hardness, elongation, surface condition, and the like.
  • the plate material when the elongation of the plate material is less than 10%, if the plate material is a rolled plate, judging from the structure of the plate material, a shear band (from fine crystals formed by accumulation of dislocations due to high strain due to rolling) Since the band-like structure) has a mesh shape in the plate thickness cross section, if it is judged from the tensile strength, it is 300 MPa or more, so if it is judged from the surface state, the arithmetic average roughness Ra It can be seen from the fact that (JIS B06001 01) is 1.5 ⁇ m or less.
  • the fact that the protrusions are integrally formed on the rolled plate body can be easily understood by directly observing the rolled plate. For example, if the cross section of the rolled plate is observed with a microscope, it can be confirmed histologically that there is no joint between the rolled plate main body and the protrusions.
  • the protrusion 20 of the rolled sheet 1 of the present invention may be formed on one surface side of the rolled plate body 10. Unlike FIG. 1A, the one surface side of the body 10. And on the other surface side.
  • the protrusions 20 in the rolled plate 1 are calculated by, for example, calculating the average thickness of the rolled plate body 10 and setting the average thickness as the thickness t of the rolled plate body 10. What is necessary is just to prescribe
  • a preferable range of the thickness t of the rolled plate body 10 is 0.3 to 3.0 mm, and a more preferable range is 0.4 to 1.0 mm. This average thickness should just average the measured value in 10 or more different measurement points about the rolled sheet main body 10.
  • the length L of the ridge 20 may be 10 times or more of the thickness t of the main body 10, but from the viewpoint of increasing the rigidity of the rolled plate 1, it is preferably 20 times or more of t, more preferably, It is at least 30 times t.
  • the measured value of the length L is preferably, for example, 30 mm or more if the rolled sheet of the present invention is used as a casing of a mobile phone, and 100 mm or more if it is used as a casing of a personal computer.
  • the ridges 20 may be provided singly or plurally with respect to the rolled plate body 10. In the case of singular, it is preferably formed in a series length from one side of the rolled plate body 10 to a side opposite to the one side. In the case of a plurality, for example, as shown in FIG. 1A, a plurality of long ridges 20 may be arranged in parallel, or as shown in FIG. 1B, the plurality of ridges 20 are arranged on a straight line (L direction). A plurality of protrusion groups may be provided in parallel. Whatever configuration is selected, at least one ridge 20 intersects an arbitrary straight line perpendicular to the length direction of the ridge 20 (two two-dot chain lines shown in the figure as representative). To do.
  • any one of the ridges 20 becomes a bending resistance, so that the rolling plate 1 that is difficult to bend, that is, the highly rigid rolling plate 1 is used. It becomes.
  • the ridges 20 are arranged such that at least two ridges 20 intersect, for example, in a cross shape or a lattice shape. It may be arranged. Also in this case, it is preferable that at least one protrusion 20 intersects a straight line orthogonal to the length direction of the intersecting protrusions 20.
  • the cross-sectional shape of the ridge 20 is not particularly limited.
  • a rectangle see FIG. 2A
  • a triangle see FIG. 2B
  • a trapezoid see FIG. 2C, preferably an isosceles trapezoid
  • a dome see FIG. 2D.
  • the shape may be a semicircular shape, etc.).
  • the width W of the protrusion 20 is preferably in the range of 0.2 to 20 mm.
  • the width W is reduced, the ridge 20 is easily damaged when a physical force is applied to the ridge 20, and when the width W is increased, the degree of weight reduction of the rolled sheet 1 is reduced.
  • the optimum value of the height H of the ridge 20 varies depending on the shape of the ridge 20, but is preferably in the range of about 0.2 to 1.0 mm. More preferably, it is more than this.
  • the height H of the protrusion 20 may be defined from the cross-sectional shape and cross-sectional area of the protrusion 20. Considering the balance between the rigidity imparted to the rolled plate 1 and the weight reduction of the rolled plate 1, the preferred cross-sectional area of one protrusion 20 is 0.15 to 1.5 mm 2 . Then, the height H may be set so as to satisfy the preferable range of the width W described above with the selected cross-sectional shape while satisfying the area range. For example, in the case of the ridge 20 having a rectangular cross section, the height H may be set by setting the width W to 0.2 to 4 mm.
  • the number of ridges 20 formed on the rolled plate body 10 is not particularly limited. However, if the number of the protrusions 20 is too large, the effect of reducing the weight of the rolled sheet 1 is reduced. Therefore, if a plurality of ridges 20 are formed on the rolled plate body 10, the interval S between adjacent ridges 20 is set to 15 mm or more, and the ridges 20 formed on the rolled plate 1 are adjusted to an appropriate number. It is preferable. If there is even one ridge 20, it has the effect of improving the strength of the rolled sheet 1.
  • the magnesium alloy which comprises a rolled sheet is not specifically limited.
  • an Mg-Al based alloy containing Al for example, an AZ based alloy in the ASTM standard (Mg—Al—Zn based alloy, Zn: 0.2 to 1.5 mass%), AM alloy (Mg—Al—Mn alloy, Mn: 0.15 to 0.5 mass%), AS alloy (Mg—Al—Si alloy, Si: 0.6 to 1.4 mass%), An Mg—Al—RE (rare earth element) alloy or the like is preferable.
  • an AZ91 equivalent material containing 8.3 to 9.5% by mass of Al (for example, AZ91E; containing 8.3 to 9.2% by mass of Al, AZ91D; Al containing 8.5 to 9.5% by mass of Al) Is excellent in mechanical properties such as strength and resistance to cracking during plastic deformation and corrosion resistance.
  • ⁇ Method for producing rolled sheet of the present invention In order to manufacture a rolled plate in which the ridges are integrally formed on the rolled plate body, the ridges may be formed on the rolled plate body simultaneously with the rolling of the material. Below, the manufacturing method of the rolled sheet of this invention is demonstrated concretely.
  • the method for producing a rolled sheet according to the present invention is a method for producing a rolled sheet by rolling a material made of a magnesium alloy using a rolling roll, and the rolling roll has a groove having an outer periphery, and this rolling
  • the rolled sheet of the present invention is produced by rolling the material with a roll.
  • a rolling roll having a groove in the final pass may be used.
  • the groove formed in the rolling roll may be provided along the circumferential direction of the rolling roll, or may be provided in parallel to the width (axis) direction of the rolling roll.
  • 3A and 3B are schematic views of the rolling roll R in which the concave groove G is formed and the rolled sheet 1 formed by the rolling roll R.
  • FIG. 1 is schematic views of the rolling roll R in which the concave groove G is formed and the rolled sheet 1 formed by the rolling roll R.
  • the concave groove G is formed along the circumferential direction of the rolling roll R (circular arrow in the figure), theoretically, in the rolling direction of the rolled sheet 1 (straight arrow in the figure).
  • the projecting ridges 20 can be formed indefinitely.
  • the groove G formed in the rolling roll R does not need to be continuous in the circumferential direction, and may be divided in the middle.
  • the protrusions 20 having a predetermined length in the rolling direction are intermittently formed on the rolled plate 1 with a predetermined interval.
  • the ridges 20 perpendicular to the rolling direction can be formed in parallel with a predetermined interval in the rolling direction. it can. Further, according to this configuration, since the rolling direction and the formation direction of the groove G are orthogonal to each other during rolling, the material easily enters the groove G. Therefore, even if the concave groove G is deepened, it is possible to form the ridge 20 in which the shape of the concave groove G is accurately transferred.
  • Test Example 1 A rolled plate made of a plurality of magnesium alloys was produced and its strength was measured.
  • It consists of a magnesium alloy having a composition corresponding to AZ31 (Mg-3.0 mass% Al-1.0 mass% Zn) and a composition corresponding to AZ91 (Mg-9.0 mass% Al-1.0 mass% Zn).
  • a plurality of material plates were prepared. The material plate in this test example was obtained by twin roll casting, but may be obtained by other methods such as extrusion.
  • a multi-pass rolling roll was prepared, and a rolled sheet having a final thickness of 0.5 mm was prepared by gradually reducing the thickness of the material sheet.
  • a normal rolling roll without unevenness is used for the upper rolling roll, and a plurality of concave grooves as shown in FIG. 3A is used for the lower rolling roll.
  • a roll R in which G is formed in parallel in the circumferential direction of the roll R was used.
  • test piece was prepared by cutting each obtained rolled plate into a size of 150 mm ⁇ 30 mm.
  • the test piece P obtained from the rolled sheet 1 having the ridges 20 was prepared so as to have one ridge 20 in the long side direction of the test piece P (see FIG. 4 described later).
  • the test piece P was arranged so as to be passed over two support bases A and B arranged with an interval of 100 mm.
  • the lengths of the portions of the test piece P on the support bases A and B are the same.
  • the test piece P which has the protrusion 20 it was made for the extending
  • a deflection amount (mm) of the test piece P was measured by applying a load of 1 kg from above to the middle part of the test piece P that is not supported by the support bases A and B.
  • a load was applied to the portion of the ridge 20 (see FIG. 4).
  • Table 1 shows the measured deflection amount of each test piece P.
  • the samples 2 and 4-6 having the protrusions 20 have a smaller amount of deflection and higher rigidity than the samples 1 and 3 without the protrusions 20.
  • the samples 7 and 8 are seen, if the thickness t of the rolled plate 1 is increased, the weight of the rolled plate 1 cannot be reduced, but the rigidity of the rolled plate 1 is increased.
  • the sample 5 in which the height H of the ridge 20 is 0.5 mm is superior to the sample 4 in which the height H is 0.2 mm.
  • the sample 6 in which the cross-sectional shape of the ridge 20 is rectangular is superior in rigidity to the sample 4 having an isosceles trapezoid.
  • Samples 2 and 4-6 having the above-described protrusions can be subjected to secondary processing. Specifically, when pressing was performed on these samples by bending the rolled plate at a right angle in a direction perpendicular to the extending direction of the protrusions, all the samples could be processed without causing damage. However, it is necessary to pay attention to those having a ridge having a rectangular cross section because damage may occur when the height H of the ridge is increased.
  • the magnesium alloy member of the present invention can be suitably used for a member that is desired to be lightweight, such as a portable device or a housing of a personal computer.

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Abstract

Provided is a rolled magnesium alloy plate having a rib which is formed integral with the plate, the rib having a height more than 10 times the thickness of the plate providing the plate with higher rigidity.  Also provided is a method of producing the magnesium alloy plate by means of a roll having a groove around the periphery thereof.

Description

圧延板、および圧延板の製造方法Rolled plate and method for producing rolled plate
　本発明は、携帯用電気機器の筐体などに好適に利用することができるマグネシウム合金からなる圧延板、およびその製造方法に関するものである。 The present invention relates to a rolled plate made of a magnesium alloy that can be suitably used for a casing of a portable electric device and the like, and a manufacturing method thereof.
　マグネシウムに種々の添加元素を含有したマグネシウム合金が、携帯電話やノートパソコンといった携帯用電気機器類の筐体や自動車部品などの部材の材料に利用されてきている。 Magnesium alloys containing various additive elements in magnesium have been used as materials for casings of portable electric devices such as mobile phones and notebook computers and members of automobile parts.
　最近、ＡＳＴＭ規格のＡＺ３１合金に代表される展伸用マグネシウム合金からなる板にプレス加工を施し、上記筐体を形成することが検討されている（例えば、特許文献１，２参照）。また、ＡＳＴＭ規格のＡＺ９１合金からなり、プレス加工性に優れる板も検討されている（例えば、特許文献３参照）。 Recently, it has been studied to press a plate made of a magnesium alloy for extension represented by ASTM standard AZ31 alloy to form the casing (for example, see Patent Documents 1 and 2). Further, a plate made of ASTM standard AZ91 alloy and excellent in press workability has been studied (for example, see Patent Document 3).
　近年では、携帯機器の更なる軽量化が望まれており、筐体の原料であるマグネシウム合金からなる板材を軽量化することが望まれている。しかし、軽量化のためにマグネシウム合金からなる板材の厚さを薄くすると、携帯機器の筐体として要求される剛性を満たさない虞がある。 In recent years, it has been desired to further reduce the weight of portable devices, and it is desired to reduce the weight of a plate made of a magnesium alloy, which is a raw material for a housing. However, if the thickness of the plate made of a magnesium alloy is reduced in order to reduce the weight, there is a possibility that the rigidity required for the casing of the portable device may not be satisfied.
　そこで、本発明の目的の一つは、マグネシウム合金からなる板材であって、薄くても剛性が高い板材、およびその製造方法を提供することにある。 Therefore, one of the objects of the present invention is to provide a plate material made of a magnesium alloy, which is thin but has high rigidity, and a method for manufacturing the same.
　本発明は、マグネシウム合金からなる圧延板であって、板状の圧延板本体と、本体に一体に形成される突条とを備え、この突条が、圧延板本体の厚さの１０倍以上の長さを有することを特徴とする。 The present invention is a rolled plate made of a magnesium alloy, comprising a plate-like rolled plate main body and a ridge formed integrally with the main body, and this ridge is 10 times or more the thickness of the rolled plate main body. It has the length of.
　圧延板本体に一体化され、圧延板本体の厚さの１０倍の長さを有する突条は、圧延板におけるリブの役割を果たすので、圧延板の剛性を大きく向上させることができる。そのため、本発明の圧延板は、圧延板本体の厚さを薄くしても、高い剛性を誇る。また、圧延板本体に突条が一体化されていると、圧延板にプレス加工などの二次加工を行う際、加工により変形する部分に突条を含めることができる。 Since the protrusions integrated with the rolled sheet main body and having a length 10 times the thickness of the rolled sheet main body serve as ribs in the rolled sheet, the rigidity of the rolled sheet can be greatly improved. Therefore, the rolled sheet of the present invention has high rigidity even if the thickness of the rolled sheet body is reduced. In addition, when the protrusions are integrated with the rolled plate body, the protrusions can be included in a portion deformed by the processing when performing secondary processing such as press processing on the rolled plate.
　本発明の圧延板において、圧延板上で突条の長さ方向に直交する任意の直線に少なくとも１つの突条が交差することが好ましい。突条の長さ方向に直交する任意の直線に、少なくとも一つの突条が交差するようにすれば、上記任意の直線を曲げ代として圧延板を曲げようとしても、いずれかの突条が曲げの抵抗となるので、曲がり難い圧延板、即ち剛性の高い圧延板となる。 In the rolled sheet of the present invention, it is preferable that at least one protrusion intersects an arbitrary straight line perpendicular to the length direction of the protrusion on the rolled sheet. If at least one ridge intersects an arbitrary straight line perpendicular to the length direction of the ridge, any ridge will bend even if an attempt is made to bend the rolled sheet using the above arbitrary straight line as a bending allowance. Therefore, it becomes a rolled sheet that is difficult to bend, that is, a highly rigid rolled sheet.
　本発明の圧延板において、突条の断面形状が矩形であることが好ましい。また、突条の高さが圧延板本体の厚さ以上であることが好適である。この構成によれば、圧延板の強度を向上させることができる。 In the rolled sheet of the present invention, it is preferable that the cross-sectional shape of the protrusion is rectangular. Moreover, it is preferable that the height of the protrusion is equal to or greater than the thickness of the rolled plate body. According to this configuration, the strength of the rolled plate can be improved.
　本発明の圧延板において、Ａｌの含有量が８.３～９.５質量％であることが好ましい。この構成によれば、強度、塑性変形時の割れ難さといった機械的特性や、耐食性に優れた圧延板を得ることができる。 In the rolled sheet of the present invention, the Al content is preferably 8.3 to 9.5% by mass. According to this configuration, it is possible to obtain a rolled sheet having excellent mechanical properties such as strength and difficulty in cracking during plastic deformation and corrosion resistance.
　　さらに、本発明は、圧延ロールによりマグネシウム合金からなる素材を圧延することで圧延板を製造する方法であって、圧延ロールは、その外周に凹溝を有する構成とし、この圧延ロールで素材を圧延することで、板状の圧延板本体と、圧延板本体に一体に形成される突条とを備え、突条が圧延板本体の厚さの１０倍以上の長さを有するマグネシウム合金からなる圧延板を製造することを特徴とする。この構成によれば、突条を板材に、高い生産性で、一体化して形成することができる。 Furthermore, the present invention is a method for producing a rolled plate by rolling a material made of a magnesium alloy with a rolling roll, and the rolling roll has a configuration having a groove on its outer periphery, and the material is rolled with this rolling roll. Thus, rolling is made of a magnesium alloy having a plate-like rolled plate body and a protrusion formed integrally with the rolled plate body, and the protrusion has a length of 10 times or more the thickness of the rolled plate body. A board is manufactured. According to this configuration, the protrusions can be formed integrally with the plate material with high productivity.
　前記凹溝は、圧延ロールの周方向に沿って設けられていることが好ましい。この構成によれば、圧延板の圧延方向に沿った突条を容易に形成することができる。 The concave grooves are preferably provided along the circumferential direction of the rolling roll. According to this structure, the protrusion along the rolling direction of the rolled sheet can be easily formed.
前記凹溝は、圧延ロールの幅方向に平行に設けられていることが好ましい。この構成によれば、圧延方向に直交する突条を圧延方向に所定の間隔を空けて並列するように形成することができる。 It is preferable that the said ditch | groove is provided in parallel with the width direction of a rolling roll. According to this configuration, the ridges orthogonal to the rolling direction can be formed in parallel with a predetermined interval in the rolling direction.
　本発明の圧延板は、圧延板本体に突条が形成されているため、薄肉であっても強度が高い。そのため、本発明の圧延板を携帯機器の筐体として利用すれば、その機器に要求される強度を満たしつつ機器の軽量化を図ることができる。 The rolled plate of the present invention has a high strength even if it is thin because the ridges are formed on the rolled plate body. Therefore, if the rolled plate of the present invention is used as a casing of a portable device, the weight of the device can be reduced while satisfying the strength required for the device.
図１Aは、本発明圧延板の斜視図であって、一連長の突条が複数並列された状態で設けられた圧延板を示す。FIG. 1A is a perspective view of a rolled sheet of the present invention, and shows a rolled sheet provided with a plurality of series-length protrusions arranged in parallel. 図１Bは、本発明圧延板の斜視図であって、一直線上に配列された複数の突条からなる突条群が複数並列された状態で設けられた圧延板を示す。FIG. 1B is a perspective view of the rolled sheet of the present invention, and shows a rolled sheet provided with a plurality of ridge groups composed of a plurality of ridges arranged in a straight line. 図２Aは、本発明圧延板を突条の形成方向と直交する方向に切断した本発明圧延板の部分断面図であって、断面矩形の突条を有する圧延板を示す。FIG. 2A is a partial cross-sectional view of the rolled sheet of the present invention obtained by cutting the rolled sheet of the present invention in a direction orthogonal to the direction in which the protrusions are formed, and shows a rolled sheet having protrusions having a rectangular cross section. 図２Bは、本発明圧延板を突条の形成方向と直交する方向に切断した本発明圧延板の部分断面図であって、断面三角形の突条を有する圧延板を示す。FIG. 2B is a partial cross-sectional view of the rolled sheet of the present invention obtained by cutting the rolled sheet of the present invention in a direction orthogonal to the direction in which the protrusions are formed, and shows a rolled sheet having protrusions having a triangular cross section. 図２Cは、本発明圧延板を突条の形成方向と直交する方向に切断した本発明圧延板の部分断面図であって、断面台形の突条を有する圧延板を示す。FIG. 2C is a partial cross-sectional view of the rolled sheet of the present invention obtained by cutting the rolled sheet of the present invention in a direction orthogonal to the direction in which the protrusions are formed, and shows a rolled sheet having a trapezoidal protrusion in the cross section. 図２Dは、本発明圧延板を突条の形成方向と直交する方向に切断した本発明圧延板の部分断面図であって、断面ドーム状の突条を有する圧延板を示す。FIG. 2D is a partial cross-sectional view of the rolled sheet of the present invention obtained by cutting the rolled sheet of the present invention in a direction perpendicular to the direction in which the protrusions are formed, and shows a rolled sheet having a projected dome-shaped protrusion. 図３Aは、圧延ロールと、その圧延ロールを使用して作製される圧延板の概略図であって、圧延ロールの周方向に沿って形成される凹溝を有する圧延ロールを使用した場合を示す。FIG. 3A is a schematic view of a rolling roll and a rolled plate produced using the rolling roll, and shows a case where a rolling roll having a groove formed along the circumferential direction of the rolling roll is used. . 図３Bは、圧延ロールと、その圧延ロールを使用して作製される圧延板の概略図であって、圧延ロールの軸方向に平行に形成された凹溝を有する圧延ロールを使用した場合を示す。FIG. 3B is a schematic view of a rolling roll and a rolled plate produced using the rolling roll, and shows a case where a rolling roll having a groove formed in parallel to the axial direction of the rolling roll is used. . 図４は、実施形態に係る圧延板から切り出した試験片のたわみ量を測定する方法についての説明図である。Drawing 4 is an explanatory view about the method of measuring the amount of deflection of the test piece cut out from the rolled sheet concerning an embodiment.
　以下、本発明の実施の形態を説明する。なお、図面の説明においては、同一要素には同一符号を付し、重複する説明を省略する。また、図面の寸法比率は、説明のものと必ずしも一致していない。 Hereinafter, embodiments of the present invention will be described. In the description of the drawings, the same reference numerals are assigned to the same elements, and duplicate descriptions are omitted. Further, the dimensional ratios in the drawings do not necessarily match those described.
　本発明は、マグネシウム合金からなる圧延板であって、板状の圧延板本体と、本体に一体に形成される突条とを備え、この突条が、圧延板本体の厚さの１０倍以上の長さを有する。 The present invention is a rolled plate made of a magnesium alloy, comprising a plate-like rolled plate main body and a ridge formed integrally with the main body, and this ridge is 10 times or more the thickness of the rolled plate main body. Have a length of
　圧延板本体に一体化され、圧延板本体の厚さの１０倍の長さを有する突条は、圧延板におけるリブの役割を果たすので、圧延板の剛性を大きく向上させることができる。そのため、本発明の圧延板は、圧延板本体の厚さを薄くしても、高い剛性を誇る。また、圧延板本体に突条が一体化されていると、圧延板にプレス加工などの二次加工を行う際、加工により変形する部分に突条を含めることができる。これに対して、圧延板本体とは別部材とした突条を圧延板本体にネジ止めしたり溶接したりした場合、ネジ止め部や溶接部に変形が加わると、突条が圧延板本体から脱落するなどの不具合が生じる可能性が高い。 Since the protrusions integrated with the rolled sheet main body and having a length 10 times the thickness of the rolled sheet main body serve as ribs in the rolled sheet, the rigidity of the rolled sheet can be greatly improved. Therefore, the rolled sheet of the present invention has high rigidity even if the thickness of the rolled sheet body is reduced. In addition, when the protrusions are integrated with the rolled plate body, the protrusions can be included in a portion deformed by the processing when performing secondary processing such as press processing on the rolled plate. On the other hand, when a ridge that is a separate member from the rolled plate main body is screwed or welded to the rolled plate main body, if deformation is applied to the screwed portion or the welded portion, the ridge is removed from the rolled plate main body. There is a high possibility of problems such as dropping off.
　＜圧延板の全体構成＞
　本発明の圧延板が圧延により得られたものであることは、圧延板の物理的特性を調べることで容易にわかる。代表的な物理特性としては、圧延板の組織や、引張り強さ、硬度、伸び、表面状態などを挙げることができる。例えば、板材の伸びが１０％未満の場合、板材が圧延板であることは、板材の組織から判断するのであれば、剪断帯（圧延による高歪によって転位が蓄積されて形成された微細結晶からなる帯状の組織）が板厚断面に網目状となっていることから、引張り強さから判断するのであれば、３００ＭＰａ以上であることから、表面状態から判断するのであれば、算術平均粗さＲａ（ＪＩＳ　Ｂ０６０１　０１）が１.５μｍ以下であることからわかる。 <Overall configuration of rolled sheet>
It can be easily understood by examining the physical properties of the rolled sheet that the rolled sheet of the present invention is obtained by rolling. Typical physical properties include the structure of the rolled plate, tensile strength, hardness, elongation, surface condition, and the like. For example, when the elongation of the plate material is less than 10%, if the plate material is a rolled plate, judging from the structure of the plate material, a shear band (from fine crystals formed by accumulation of dislocations due to high strain due to rolling) Since the band-like structure) has a mesh shape in the plate thickness cross section, if it is judged from the tensile strength, it is 300 MPa or more, so if it is judged from the surface state, the arithmetic average roughness Ra It can be seen from the fact that (JIS B06001 01) is 1.5 μm or less.
　また、突条が圧延板本体に一体に形成されていることは、圧延板を直接観察することで容易にわかる。例えば、圧延板の断面を顕微鏡観察すれば、圧延板本体と突条との間につなぎ目がないことを組織学的に確認できる。 Also, the fact that the protrusions are integrally formed on the rolled plate body can be easily understood by directly observing the rolled plate. For example, if the cross section of the rolled plate is observed with a microscope, it can be confirmed histologically that there is no joint between the rolled plate main body and the protrusions.
　＜突条の形状と寸法＞
　例えば、本発明圧延板１の突条２０は、図１Aの斜視図に示すように、圧延板本体１０の一面側に形成されていても良いし、図１Aとは異なり、本体１０の一面側と他面側の両方に設けられていても良い。圧延板１における突条２０は、例えば、圧延板本体１０の平均厚さを算出して、この平均厚さを圧延板本体１０の厚さｔとし、この厚さｔよりも厚い圧延板１の箇所として規定すれば良い。圧延板本体１０の厚さｔの好ましい範囲は、０.３～３.０ｍｍ、より好ましい範囲は、０.４～１.０ｍｍである。この平均厚さは、圧延板本体１０について１０点以上の異なる測定点での測定値を平均したものとすれば良い。 <Shape shape and dimensions>
For example, as shown in the perspective view of FIG. 1A, the protrusion 20 of the rolled sheet 1 of the present invention may be formed on one surface side of the rolled plate body 10. Unlike FIG. 1A, the one surface side of the body 10. And on the other surface side. The protrusions 20 in the rolled plate 1 are calculated by, for example, calculating the average thickness of the rolled plate body 10 and setting the average thickness as the thickness t of the rolled plate body 10. What is necessary is just to prescribe | regulate as a location. A preferable range of the thickness t of the rolled plate body 10 is 0.3 to 3.0 mm, and a more preferable range is 0.4 to 1.0 mm. This average thickness should just average the measured value in 10 or more different measurement points about the rolled sheet main body 10. FIG.
　突条２０の長さＬは、本体１０の厚さｔの１０倍以上であれば良いが、圧延板１の剛性を高める観点からすれば、好ましくは、ｔの２０倍以上、より好ましくは、ｔの３０倍以上である。長さＬの実測値としては、例えば、本発明圧延板を携帯電話の筐体として利用するのであれば３０ｍｍ以上、パソコンの筐体として利用するのであれば１００ｍｍ以上とすることが好ましい。 The length L of the ridge 20 may be 10 times or more of the thickness t of the main body 10, but from the viewpoint of increasing the rigidity of the rolled plate 1, it is preferably 20 times or more of t, more preferably, It is at least 30 times t. The measured value of the length L is preferably, for example, 30 mm or more if the rolled sheet of the present invention is used as a casing of a mobile phone, and 100 mm or more if it is used as a casing of a personal computer.
　突条２０は、圧延板本体１０に対して単数設けられていても複数設けられていても良い。単数の場合、圧延板本体１０の一辺から、この一辺に対向する辺にかけて一連長に形成されていることが好ましい。複数の場合、例えば、図１Aに示すように、一連長の突条２０を複数並列しても良いし、図１Bに示すように、複数の突条２０を一直線（Ｌ方向）上に配置した突条群を複数並列して設けても良い。どのような構成を選択するにせよ、突条２０の長さ方向に直交する任意の直線（図中に代表して４本示す二点鎖線）に、少なくとも一つの突条２０が交差するようにする。このようにすれば、上記任意の直線を曲げ代として圧延板１を曲げようとしても、いずれかの突条２０が曲げの抵抗となるので、曲がり難い圧延板１、即ち剛性の高い圧延板１となる。その他、複数の突条２０を設ける場合、圧延板１を上面視（下面視）したときに、少なくとも２つの突条２０が交差するような配置、例えば、十字架状や格子状に突条２０を配置しても良い。この場合も、交差する各突条２０の長さ方向と直交する直線に少なくとも一つの突条２０が交差するようにすることが好ましい。 The ridges 20 may be provided singly or plurally with respect to the rolled plate body 10. In the case of singular, it is preferably formed in a series length from one side of the rolled plate body 10 to a side opposite to the one side. In the case of a plurality, for example, as shown in FIG. 1A, a plurality of long ridges 20 may be arranged in parallel, or as shown in FIG. 1B, the plurality of ridges 20 are arranged on a straight line (L direction). A plurality of protrusion groups may be provided in parallel. Whatever configuration is selected, at least one ridge 20 intersects an arbitrary straight line perpendicular to the length direction of the ridge 20 (two two-dot chain lines shown in the figure as representative). To do. In this way, even if it is going to bend the rolling plate 1 by using the above-mentioned arbitrary straight line as a bending allowance, any one of the ridges 20 becomes a bending resistance, so that the rolling plate 1 that is difficult to bend, that is, the highly rigid rolling plate 1 is used. It becomes. In addition, in the case where a plurality of ridges 20 are provided, when the rolled plate 1 is viewed from the top (bottom view), the ridges 20 are arranged such that at least two ridges 20 intersect, for example, in a cross shape or a lattice shape. It may be arranged. Also in this case, it is preferable that at least one protrusion 20 intersects a straight line orthogonal to the length direction of the intersecting protrusions 20.
　突条２０の断面形状は、特に限定されない。例えば、断面形状として、矩形（図２Aを参照。）、三角形（図２Bを参照。）、台形（図２C参照。好ましくは、等脚台形でもよい。）、ドーム状（図２Dを参照。断面形状は、半円状などでも良い、）などを挙げることができる。 The cross-sectional shape of the ridge 20 is not particularly limited. For example, as a cross-sectional shape, a rectangle (see FIG. 2A), a triangle (see FIG. 2B), a trapezoid (see FIG. 2C, preferably an isosceles trapezoid), or a dome (see FIG. 2D. The shape may be a semicircular shape, etc.).
　突条２０の幅Ｗは、０.２～２０ｍｍの範囲とすることが好ましい。幅Ｗが小さくなると、突条２０に物理的な力が作用したときに突条２０が破損し易いし、幅Ｗが大きくなると、圧延板１の軽量化の度合いが低下する。 The width W of the protrusion 20 is preferably in the range of 0.2 to 20 mm. When the width W is reduced, the ridge 20 is easily damaged when a physical force is applied to the ridge 20, and when the width W is increased, the degree of weight reduction of the rolled sheet 1 is reduced.
　また、突条２０の高さＨは、突条２０の形状によって最適な値が変化するが、概ね０.２～１.０ｍｍの範囲とすることが好ましく、この範囲で圧延板本体１０の厚さ以上とすることがより好ましい。その他、突条２０の高さＨは、突条２０の断面形状と断面積とから規定しても良い。圧延板１に付与する剛性と圧延板１の軽量化とのバランスを考慮すれば、一つの突条２０の好ましい断面積は、０.１５～１.５ｍｍ２である。そして、この面積の範囲を満たしつつ、選択した断面形状で上述した幅Ｗの好ましい範囲を満たすように高さＨを設定すれば良い。例えば、断面矩形の突条２０であれば、幅Ｗを０.２～４ｍｍとして高さＨを設定すれば良い。 In addition, the optimum value of the height H of the ridge 20 varies depending on the shape of the ridge 20, but is preferably in the range of about 0.2 to 1.0 mm. More preferably, it is more than this. In addition, the height H of the protrusion 20 may be defined from the cross-sectional shape and cross-sectional area of the protrusion 20. Considering the balance between the rigidity imparted to the rolled plate 1 and the weight reduction of the rolled plate 1, the preferred cross-sectional area of one protrusion 20 is 0.15 to 1.5 mm 2 . Then, the height H may be set so as to satisfy the preferable range of the width W described above with the selected cross-sectional shape while satisfying the area range. For example, in the case of the ridge 20 having a rectangular cross section, the height H may be set by setting the width W to 0.2 to 4 mm.
　また、圧延板本体１０に形成される突条２０の数は、特に限定されない。但し、突条２０の数があまりに多くなると、圧延板１の軽量化の効果が低くなる。従って、圧延板本体１０に複数の突条２０を形成するのであれば、隣り合う突条２０間の間隔Ｓを１５ｍｍ以上として、圧延板１に形成される突条２０を適当な数に調整することが好ましい。突条２０が一つでもあれば、圧延板１の強度を向上させる効果を有する。 Further, the number of ridges 20 formed on the rolled plate body 10 is not particularly limited. However, if the number of the protrusions 20 is too large, the effect of reducing the weight of the rolled sheet 1 is reduced. Therefore, if a plurality of ridges 20 are formed on the rolled plate body 10, the interval S between adjacent ridges 20 is set to 15 mm or more, and the ridges 20 formed on the rolled plate 1 are adjusted to an appropriate number. It is preferable. If there is even one ridge 20, it has the effect of improving the strength of the rolled sheet 1.
　＜圧延板の材質＞
　圧延板を構成するマグネシウム合金は、特に限定されない。例えば、耐食性を重視するのであれば、Ａｌを含有するＭｇ－Ａｌ系合金、例えば、ＡＳＴＭ規格におけるＡＺ系合金（Ｍｇ－Ａｌ－Ｚｎ系合金、Ｚｎ：０.２～１.５質量％）、ＡＭ系合金（Ｍｇ－Ａｌ－Ｍｎ系合金、Ｍｎ：０.１５～０.５質量％）、ＡＳ系合金（Ｍｇ－Ａｌ－Ｓｉ系合金、Ｓｉ：０.６～１.４質量％）、Ｍｇ－Ａｌ－ＲＥ（希土類元素）系合金などが好適である。特に、Ａｌを８.３～９.５質量％含有するＡＺ９１相当材（例えば、ＡＺ９１Ｅ；８.３～９.２質量％のＡｌを含有、ＡＺ９１Ｄ；Ａｌ８.５～９.５質量％のＡｌを含有）は、強度、塑性変形時の割れ難さといった機械的特性や、耐食性に優れる。 <Material of rolled plate>
The magnesium alloy which comprises a rolled sheet is not specifically limited. For example, if corrosion resistance is important, an Mg-Al based alloy containing Al, for example, an AZ based alloy in the ASTM standard (Mg—Al—Zn based alloy, Zn: 0.2 to 1.5 mass%), AM alloy (Mg—Al—Mn alloy, Mn: 0.15 to 0.5 mass%), AS alloy (Mg—Al—Si alloy, Si: 0.6 to 1.4 mass%), An Mg—Al—RE (rare earth element) alloy or the like is preferable. In particular, an AZ91 equivalent material containing 8.3 to 9.5% by mass of Al (for example, AZ91E; containing 8.3 to 9.2% by mass of Al, AZ91D; Al containing 8.5 to 9.5% by mass of Al) Is excellent in mechanical properties such as strength and resistance to cracking during plastic deformation and corrosion resistance.
　＜本発明圧延板の製造方法＞
　圧延板本体に突条が一体に形成された圧延板を製造するためには、素材の圧延と同時に、圧延板本体に突条が形成されるようにすると良い。以下に、本発明の圧延板の製造方法を具体的に説明する。 <Method for producing rolled sheet of the present invention>
In order to manufacture a rolled plate in which the ridges are integrally formed on the rolled plate body, the ridges may be formed on the rolled plate body simultaneously with the rolling of the material. Below, the manufacturing method of the rolled sheet of this invention is demonstrated concretely.
　本発明の圧延板の製造方法は、圧延ロールによりマグネシウム合金からなる素材を圧延することで圧延板を製造する方法であって、前記圧延ロールは、その外周に凹溝を有する構成とし、この圧延ロールで素材を圧延することで、本発明の圧延板を製造することを特徴とする。例えば、本発明の圧延板を得るにあたって複数パスの圧延ロールにより連続して圧延を行う場合、最終パスに凹溝を有する圧延ロールを使用すれば良い。 The method for producing a rolled sheet according to the present invention is a method for producing a rolled sheet by rolling a material made of a magnesium alloy using a rolling roll, and the rolling roll has a groove having an outer periphery, and this rolling The rolled sheet of the present invention is produced by rolling the material with a roll. For example, when continuously rolling with a plurality of passes of rolling rolls to obtain the rolled sheet of the present invention, a rolling roll having a groove in the final pass may be used.
　マグネシウム合金からなる板材に突条を一体に形成する場合、圧延以外の方法を使用すると以下に列挙するような欠点がある。例えば、プレスや鍛造などの塑性変形加工では、形成する突条の形状に自由度を持たせることができるものの、板材の強度が低く、割れ易い。しかも、突条を作るための金型の部分に素材が入り込み難い。そのため、圧延板に形成する突条の数が多くなると、各突条の形状にばらつきが生じ易く、板材の剛性が板材の部位によって異なり、安定した品質を維持することができない。また、切削により板材に突条を形成する場合、反応性の高いマグネシウム合金の切削屑が大量に生じるため、作業時の安全性に問題がある上、歩留りが悪く生産性が良くない。これらのことから、板材に一体化された突条を形成するためには、圧延を利用することが最適である。 When a protrusion is integrally formed on a plate made of a magnesium alloy, there are drawbacks listed below when a method other than rolling is used. For example, in plastic deformation processing such as pressing and forging, the shape of the protrusions to be formed can be given a degree of freedom, but the strength of the plate material is low and it is easily cracked. Moreover, it is difficult for the material to enter the mold part for making the ridges. Therefore, when the number of ridges formed on the rolled plate increases, the shape of each ridge tends to vary, and the rigidity of the plate material varies depending on the portion of the plate material, and stable quality cannot be maintained. In addition, when the protrusions are formed on the plate material by cutting, a large amount of highly reactive magnesium alloy cutting waste is generated, so that there is a problem in safety during work and the yield is poor and the productivity is not good. From these facts, it is optimal to use rolling in order to form the protrusions integrated with the plate material.
　上記圧延ロールに形成される凹溝は、圧延ロールの周方向に沿って設けられていても良いし、圧延ロールの幅（軸）方向に平行に設けられていても良い。図３Aおよび図３Bに、凹溝Ｇを形成した圧延ロールＲと、この圧延ロールＲにより形成される圧延板１の概略図を示す。 The groove formed in the rolling roll may be provided along the circumferential direction of the rolling roll, or may be provided in parallel to the width (axis) direction of the rolling roll. 3A and 3B are schematic views of the rolling roll R in which the concave groove G is formed and the rolled sheet 1 formed by the rolling roll R. FIG.
　図３Aに示すように、圧延ロールＲの周方向（図中の円弧矢印）に沿って凹溝Ｇを形成すれば、理論的には、圧延板１の圧延方向（図中の直線矢印）に沿った突条２０を無限に形成することができる。ここで、圧延ロールＲに形成される凹溝Ｇは、周方向に連続している必要はなく、途中で分断されていても良い。この場合、圧延方向に所定の長さを有する突条２０が、所定の間隔を空けて圧延板１に断続的に形成される。 As shown in FIG. 3A, if the concave groove G is formed along the circumferential direction of the rolling roll R (circular arrow in the figure), theoretically, in the rolling direction of the rolled sheet 1 (straight arrow in the figure). The projecting ridges 20 can be formed indefinitely. Here, the groove G formed in the rolling roll R does not need to be continuous in the circumferential direction, and may be divided in the middle. In this case, the protrusions 20 having a predetermined length in the rolling direction are intermittently formed on the rolled plate 1 with a predetermined interval.
　図３Bに示すように、圧延ロールＲの幅方向に平行に凹溝Ｇを形成すれば、圧延方向に直交する突条２０を圧延方向に所定の間隔を空けて並列するように形成することができる。また、この構成によれば、圧延の際に、圧延方向と凹溝Ｇの形成方向とが直交しているので、凹溝Ｇに素材が入り込み易い。そのため、凹溝Ｇを深くしても凹溝Ｇの形状が精度良く転写された突条２０を形成することができる。 As shown in FIG. 3B, if the groove G is formed parallel to the width direction of the rolling roll R, the ridges 20 perpendicular to the rolling direction can be formed in parallel with a predetermined interval in the rolling direction. it can. Further, according to this configuration, since the rolling direction and the formation direction of the groove G are orthogonal to each other during rolling, the material easily enters the groove G. Therefore, even if the concave groove G is deepened, it is possible to form the ridge 20 in which the shape of the concave groove G is accurately transferred.
　また、図３に示す凹溝と、図３Bに示す凹溝とを組み合わせた圧延ロールとしても良い。この場合、圧延板を上面視したときに、十字架状に配された突条や、格子状に配された突条を形成することができる。 Moreover, it is good also as a rolling roll which combined the ditch | groove shown in FIG. 3, and the ditch | groove shown in FIG. 3B. In this case, when the rolled plate is viewed from above, it is possible to form protrusions arranged in a cross shape or protrusions arranged in a lattice shape.
　その他、凹溝を、圧延ロールの周方向と幅方向の両方に交差する方向に伸びるように形成しても良い。この場合、圧延板の斜め方向に伸びる突条を形成することができる。 In addition, you may form a ditch | groove so that it may extend in the direction which cross | intersects both the circumferential direction and width direction of a rolling roll. In this case, it is possible to form a ridge extending in the oblique direction of the rolled plate.
　[試験例1]
　複数のマグネシウム合金からなる圧延板を作製し、その強度を測定した。 [Test Example 1]
A rolled plate made of a plurality of magnesium alloys was produced and its strength was measured.
　ＡＺ３１相当の組成（Ｍｇ－３.０質量％Ａｌ－１.０質量％Ｚｎ）、およびＡＺ９１相当の組成（Ｍｇ－９.０質量％Ａｌ－１.０質量％Ｚｎ）を有するマグネシウム合金からなる素材板（厚さ３.０ｍｍ）を複数用意した。本試験例における素材板は、双ロール鋳造により得たが、他の方法、例えば押し出しなどにより得ても良い。 It consists of a magnesium alloy having a composition corresponding to AZ31 (Mg-3.0 mass% Al-1.0 mass% Zn) and a composition corresponding to AZ91 (Mg-9.0 mass% Al-1.0 mass% Zn). A plurality of material plates (thickness: 3.0 mm) were prepared. The material plate in this test example was obtained by twin roll casting, but may be obtained by other methods such as extrusion.
　次に、複数パスの圧延ロールを用意し、素材板の厚さを徐々に薄くすることで最終的な厚さが０.５ｍｍの圧延板を作製した。ここで、最終パスに使用する一対の圧延ロールのうち、上側の圧延ロールには、凹凸の無い通常の圧延ロールを使用し、下側のロールには、図３Aに示すような複数の凹溝ＧがロールＲの周方向に並列して形成されているロールＲを使用した。このようにすることで、圧延板本体１０の一面側に突条２０が並列して形成された圧延板１を作製した（図３Aを参照。）。 Next, a multi-pass rolling roll was prepared, and a rolled sheet having a final thickness of 0.5 mm was prepared by gradually reducing the thickness of the material sheet. Here, among the pair of rolling rolls used in the final pass, a normal rolling roll without unevenness is used for the upper rolling roll, and a plurality of concave grooves as shown in FIG. 3A is used for the lower rolling roll. A roll R in which G is formed in parallel in the circumferential direction of the roll R was used. By doing in this way, the rolled sheet 1 in which the protrusion 20 was formed in parallel on the one surface side of the rolled sheet main body 10 was produced (refer FIG. 3A).
　次いで、得られた各圧延板を１５０ｍｍ×３０ｍｍの寸法に切り出した試験片を作製した。突条２０を有する圧延板１から得られる試験片Ｐは、試験片Ｐの長辺方向に１つの突条２０を有するように作製した（後述する図４を参照。）。 Next, a test piece was prepared by cutting each obtained rolled plate into a size of 150 mm × 30 mm. The test piece P obtained from the rolled sheet 1 having the ridges 20 was prepared so as to have one ridge 20 in the long side direction of the test piece P (see FIG. 4 described later).
　さらに、図４に示すように、１００ｍｍの間隔を空けて配置される２つの支持台Ａ，Ｂにかけ渡すように試験片Ｐを配置した。試験片Ｐの支持台Ａ，Ｂのそれぞれに乗っている部分の長さは、同じである。また、突条２０を有する試験片Ｐについては、突条２０の延伸方向が支持台Ａ，Ｂの並列方向に平行となるようにした（図４を参照。）。 Furthermore, as shown in FIG. 4, the test piece P was arranged so as to be passed over two support bases A and B arranged with an interval of 100 mm. The lengths of the portions of the test piece P on the support bases A and B are the same. Moreover, about the test piece P which has the protrusion 20, it was made for the extending | stretching direction of the protrusion 20 to become parallel to the parallel direction of the support bases A and B (refer FIG. 4).
　そして、試験片Ｐうち、支持台Ａ，Ｂに下支えされていない部分の中間部に上から１ｋｇの荷重をかけて試験片Ｐのたわみ量（ｍｍ）を測定した。ここで、突条２０を有する試験片Ｐにあっては、突条２０の部分に荷重をかけた（図４を参照）。測定した各試験片Ｐのたわみ量を表１に示す。 Then, a deflection amount (mm) of the test piece P was measured by applying a load of 1 kg from above to the middle part of the test piece P that is not supported by the support bases A and B. Here, in the test piece P having the ridge 20, a load was applied to the portion of the ridge 20 (see FIG. 4). Table 1 shows the measured deflection amount of each test piece P.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１の結果から、突条２０を有する試料２，４－６は、突条２０のない試料１，３よりもたわみ量が小さく、剛性が高い。これに対して、試料７，８を見れば、圧延板１の厚さｔを厚くすれば、圧延板１の軽量化を図ることはできないものの、圧延板１の剛性は、高まることがわかる。また、突条２０の高さＨが０.５ｍｍである試料５の方が、０.２ｍｍである試料４よりも剛性が優れることが明らかになった。さらに、突条２０の断面形状が矩形である試料６の方が、等脚台形である試料４よりも剛性が優れることが明らかになった。 From the results shown in Table 1, the samples 2 and 4-6 having the protrusions 20 have a smaller amount of deflection and higher rigidity than the samples 1 and 3 without the protrusions 20. On the other hand, when the samples 7 and 8 are seen, if the thickness t of the rolled plate 1 is increased, the weight of the rolled plate 1 cannot be reduced, but the rigidity of the rolled plate 1 is increased. Moreover, it became clear that the sample 5 in which the height H of the ridge 20 is 0.5 mm is superior to the sample 4 in which the height H is 0.2 mm. Furthermore, it became clear that the sample 6 in which the cross-sectional shape of the ridge 20 is rectangular is superior in rigidity to the sample 4 having an isosceles trapezoid.
　上述した突条を有する試料２，４－６は、二次加工に供することもできる。具体的には、これらの試料に対して突条の延伸方向と直交する方向に圧延板を直角に曲げるプレス加工を行ったところ、いずれの試料も損傷を生じることなく加工することができた。但し、断面矩形の突条を有するものについては、突条の高さＨを高くした場合に損傷が生じる虞があるので注意が必要である。 Samples 2 and 4-6 having the above-described protrusions can be subjected to secondary processing. Specifically, when pressing was performed on these samples by bending the rolled plate at a right angle in a direction perpendicular to the extending direction of the protrusions, all the samples could be processed without causing damage. However, it is necessary to pay attention to those having a ridge having a rectangular cross section because damage may occur when the height H of the ridge is increased.
　なお、本発明は、本発明の要旨を逸脱しない範囲において適宜変更することが可能であり、上述した実施形態の構成に限定されるものではない。 It should be noted that the present invention can be appropriately modified without departing from the gist of the present invention, and is not limited to the configuration of the above-described embodiment.
　本発明マグネシウム合金部材は、携帯機器やパソコンの筐体といった、軽量化が望まれる部材に好適に利用することができる。 The magnesium alloy member of the present invention can be suitably used for a member that is desired to be lightweight, such as a portable device or a housing of a personal computer.
　１　圧延板
　１０　本体　２０　突条
　ｔ　圧延板の厚さ
　Ｌ　突条の長さ　Ｗ　突条の幅　Ｈ　突条の高さ　Ｓ　突条間の間隔
　Ｒ　圧延ロール　Ｇ　凹溝
　Ｐ　試験片
　Ａ，Ｂ　支持台 DESCRIPTION OF SYMBOLS 1 Rolled sheet 10 Main body 20 ridge t thickness of rolled sheet L length of ridge W width of ridge H height of ridge S interval between ridges R rolling roll G concave groove P test piece A, B support Stand
特開２００１－１０５０２９号公報JP 2001-105029 A 特開２００２－２３９６４４号公報JP 2002-239644 A 特開２００７－０９８４７０号公報JP 2007-098470 A

Claims (8)

  1. 　マグネシウム合金からなる圧延板であって、
    　板状の圧延板本体と、
    　前記圧延板本体に一体に形成される突条とを備え、
    　前記突条は、圧延板本体の厚さの１０倍以上の長さを有することを特徴とする圧延板。     A rolled plate made of a magnesium alloy,
    A plate-shaped rolled plate body;
    Comprising a protrusion formed integrally with the rolled plate body,
    The said protruding item | line has a length 10 times or more of the thickness of a rolled sheet main body, The rolled sheet characterized by the above-mentioned.
  2. 　圧延板上で突条の長さ方向に直交する任意の直線に少なくとも１つの突条が交差することを特徴とする請求項１に記載の圧延板。 The rolled sheet according to claim 1, wherein at least one protrusion intersects an arbitrary straight line perpendicular to the length direction of the protrusion on the rolled sheet.
  3. 　前記突条の断面形状が矩形であることを特徴とする請求項１または２に記載の圧延板。 The rolled sheet according to claim 1 or 2, wherein a cross-sectional shape of the protrusion is rectangular.
  4. 　前記突条の高さが前記圧延板本体の厚さ以上であることを特徴とする請求項１～３のいずれか一項に記載の圧延板。 The rolled sheet according to any one of claims 1 to 3, wherein a height of the protrusion is equal to or greater than a thickness of the rolled sheet main body.
  5. 　前記マグネシウム合金は、Ａｌの含有量が８.３～９.５質量％であることを特徴とする請求項１～４のいずれか一項に記載の圧延板。 The rolled sheet according to any one of claims 1 to 4, wherein the magnesium alloy has an Al content of 8.3 to 9.5 mass%.
  6. 　圧延ロールによりマグネシウム合金からなる素材を圧延することで圧延板を製造する方法であって、
    　前記圧延ロールは、その外周に凹溝を有する構成とし、
    　この圧延ロールで素材を圧延することで、請求項１に記載の圧延板を製造することを特徴とする圧延板の製造方法。     A method for producing a rolled plate by rolling a material made of a magnesium alloy with a rolling roll,
    The rolling roll is configured to have a groove on its outer periphery,
    The rolled sheet manufacturing method according to claim 1, wherein the rolled sheet according to claim 1 is manufactured by rolling the material with the rolling roll.
  7. 　前記凹溝は、圧延ロールの周方向に沿って設けられていることを特徴とする請求項６に記載の圧延板の製造方法。 The method for producing a rolled sheet according to claim 6, wherein the groove is provided along a circumferential direction of the rolling roll.
  8. 　前記凹溝は、圧延ロールの幅方向に平行に設けられていることを特徴とする請求項６または７に記載の圧延板の製造方法。 The method for producing a rolled sheet according to claim 6 or 7, wherein the groove is provided in parallel to the width direction of the rolling roll.
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