TWI510639B - Magnesium alloy coil material - Google Patents

Description

Magnesium alloy coil

The present invention relates to a magnesium alloy coil material and a magnesium alloy sheet suitable for a material of a magnesium alloy member which is subjected to plastic working such as press working, a grinding method of a magnesium alloy coil material suitable for the production of the coil material, and a magnesium alloy. Use a grinding device. In particular, it relates to a magnesium alloy coil having a small difference in thickness across the entire length in the wide direction.

A magnesium alloy which is light in weight and excellent in specific strength and rigidity is gradually used as a constituent material for various components such as a portable electronic/electronic device such as a mobile phone or a notebook computer, or an automobile component.

The member made of the magnesium alloy is mainly made of a cast material (ASTM-size AZ91 alloy) produced by a die casting method or a semi-molten thixomolding method. In recent years, members subjected to press working on a plate made of a magnesium alloy for stretching represented by an ASTM standard AZ91 alloy have been gradually reused. Patent Document 1 discloses that a cast sheet of a magnesium alloy corresponding to an ASTM alloy of the ASTM specification is rolled by a two-roll continuous casting method, and the rolled sheet is subjected to press working.

The aforementioned pressure delay is performed, and the lubricant is usually used to reduce the frictional resistance. Next, the lubricant remaining on the surface of the rolled plate or the oxide layer formed on the surface is removed by polishing after rolling (paragraphs 0015, 0030 of Patent Document 1).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2009-120877

In the production of the magnesium alloy member of the above-described press-worked member, when a continuous long-sized plate is used as the material, it is expected to reduce the throughput and improve the productivity as compared with the case of cutting a sheet having a specific length. That is, the long-sized rolled sheet or the coil material on which the above-mentioned ground sheet is applied to the rolled sheet can be said to be a material suitable for mass-produced magnesium alloy members.

However, in the coil material composed of the above-described magnesium alloy, there is a problem in that the thickness of the coil material constituting the coil material (typically a rolled sheet) is narrowed.

Here, a coil composed of an iron-based alloy such as steel, aluminum or an alloy thereof is generally produced by cold rolling. In the calender which is used for the cold rolling, a variety of mechanisms for suppressing the difference in thickness in the width direction or the thickness in the longitudinal direction of the rolled sheet after rolling are provided by processing heat generation or the like, and rolling is performed. The thickness of the rolled plate is controlled with great precision. That is, in the above-mentioned steel or the like, the difference in thickness in the width direction and the length direction is small across the entire length thereof.

On the other hand, the magnesium alloy has poor plastic workability at normal temperature (about 20 ° C). Therefore, as described in Patent Document 1, the inter-temperature rolling is performed. The heated material itself is easily deformed by the inter-temperature rolling. Therefore, the thickness of the rolled rolled sheet in the width direction or the thickness in the longitudinal direction is likely to be different.

Further, in addition to the case where the material is also heated to the calender roll, the deformation of the thermal expansion of the calendered roll caused by the heat such as heating and heating, and the like, and other reaction forces such as pressing pressure cause the calendered roll. The influence of deformation (deflection) and the like also makes it easy for the rolled sheet to differ in thickness in the width direction or thickness in the longitudinal direction. Further, the shape of the rolled roll or the like is also a cause of a difference in the thickness of the rolled sheet in the width direction.

Moreover, the material to be calendered itself also has a difference in thickness. Here, in the case where the rolled sheet itself is also a long-sized material, the cast material which is the material thereof is preferably not an ingot (slab), but a long-sized material is preferable. For the production of a long-sized cast material, as described in Patent Document 1, a continuous casting method called a two-roll continuous casting method can be used. However, in the case of a very long-sized cast material having a total length of 30 m or more and even 50 m or more and a weight of 100 kg or more, even if the continuous casting method as described above is used, for example, casting is performed. The initial difference between the thickness and the thickness at the end of casting.

Further, when the width of the material is wide, particularly when the width is wider than 100 mm, the center portion of the material in the width direction is easily maintained in a heated state, and the same two edges or both sides are easy. The tendency to be cooled. Thereby, the difference in thickness in the width direction of the rolled sheet is also likely to occur.

From such a background, in the manufacture of a magnesium alloy coil, there is a limit to the thickness difference for reducing the low pressure delay.

Further, in the sheet, it is easy to suppress the difference in thickness in the longitudinal direction, and it is possible to easily remove the difference in the thin plate unit. Therefore, the decrease in the yield can be suppressed to some extent. However, in the case of producing a coil obtained by winding a long-sized sheet, if there is a portion having a large difference in thickness, the commercial value of the entire coil is lost, and the yield is lowered.

In other words, in the production of a magnesium alloy coil obtained by winding a long-sized plate as described above, it is desirable to develop a method for reducing the difference in thickness between both the width direction and the longitudinal direction of the above-mentioned sheet material.

Here, an object of the present invention is to provide a magnesium alloy coil having a small difference in thickness across the entire length, and a magnesium alloy sheet produced from the coil.

Here, another object of the present invention is to provide a grinding device for a magnesium alloy and a grinding method for a magnesium alloy coil which can produce a magnesium alloy coil having a small difference in thickness over the entire length.

In the magnesium alloy to which the inter-temperature rolling is applied as described above, since the difference in thickness is likely to occur due to the press-delay, the present invention proposes a grinding step after rolling, which is a difference in thickness.

The grinding method of the magnesium alloy coil material of the present invention is defined as a coiled material obtained by winding a long-sized sheet material made of a magnesium alloy, and is ground under specific conditions in order to reduce the difference in thickness across the entire length of the sheet material. More specifically, in the grinding method of the present invention, first, the thickness of the center portion in the width direction of the sheet material which is traveled by the coil material composed of the magnesium alloy and the thickness of both edge portions are measured. Next, in order to reduce the difference in the thickness, the size of the gap between the contact roller of the rotary grinding belt and the billet roll holding the plate together with the contact roller becomes uneven. The method increases or decreases the aforementioned gap. Next, the sheet material is conveyed between the adjusted gaps, and the grinding belt is ground by the grinding belt, and the total length of the grinding board after the grinding is made such that the difference in thickness in the width direction of the grinding board is within 40 μm.

In the grinding method of the magnesium alloy coil of the present invention, the following grinding apparatus for a magnesium alloy of the present invention can be suitably used. The grinding device of the present invention is a device for grinding a sheet material which is produced by discharging a coil composed of a magnesium alloy, and includes a grinding belt for grinding the sheet material, and a thickness measuring device for measuring the thickness of the sheet material on the upstream side, and adjusting the thickness A roller adjusting means for a gap between the contact roller and the anti-wrap roller through which the sheet passes, and a control portion for controlling the operation of the roller adjusting means. The thickness measuring device on the upstream side is disposed on the upstream side of the grinding belt, and measures the thickness of the center portion in the width direction of the plate material and the thickness of both edge portions. The roller adjusting means increases or decreases the size of the gap between the contact roller that rotates the grinding belt and the billet roll that holds the sheet together with the contact roller. The gap is such that a part of the pressing state of the sheet material in the width direction is different. The control unit operates the roller adjusting means so that the thickness difference in the wide direction of the grinding plate is 40 μm or less across the entire length of the grinding plate after the grinding, based on the measurement result of the thickness measuring device on the upstream side.

The grinding of the present invention is carried out by the above-described grinding method of the present invention or by the above-described grinding device of the present invention. For example, the following magnesium alloy coil of the present invention can be obtained. The magnesium alloy coil of the present invention is obtained by winding a long-sized plate made of a magnesium alloy. In particular, in the coil material, the surface roughness in the width direction of the sheet material satisfies the total length Rz of 20 μm or less, the arithmetic mean roughness Ra is 1.2 μm or less, and the ten-point average roughness Rz. It is at least one condition of 12 μm or less; the difference in thickness in the width direction of the sheet is within 40 μm. The magnesium alloy sheet of the present invention obtained by cutting the magnesium alloy coil of the present invention into a specific length satisfies the difference in thickness between the surface roughness and the width direction of the coil.

The so-called full length of the magnesium alloy coil according to the present invention means the following.

When the total length of the coil is less than 100 m, the edging material of 5% of the total length cut from both ends is cut to a length corresponding to 10% of the entire length of the trimming material, and is measured for all the cut pieces. Regarding the difference in surface roughness and thickness, all the cut pieces satisfy the above specifications.

When the total length of the coil is 100 m or more, the trimming material is cut at intervals of 5 m from both ends, and the trimming material is cut every 10 m, and the difference in surface roughness and thickness is measured for all the cut sheets. All cut pieces meet the above requirements.

The method of measuring the surface roughness and thickness will be described in detail later.

When the grinding method of the present invention or the grinding device of the present invention is used for the grinding, before the magnesium alloy sheet which is advanced as described above is supplied to the grinding belt, the thickness difference in the width direction of the sheet is measured. In the thickness difference, the size of the gap between the contact roller and the anti-wrap roll is changed in a manner such that the amount of grinding in the wide direction of the grinding belt is different. In short, in the grinding method of the present invention or the grinding method using the grinding device of the present invention, the difference in thickness in the width direction of the material is reduced by the feedforward control grinding.

According to the above configuration, even when the thickness of the magnesium alloy sheet material (typically a rolled sheet) which is a material has a large difference in the width direction, the difference in thickness in the width direction can be reduced, and specifically, it can be reduced to 40 μm or less (±20 μm or less). That is, according to the grinding method of the present invention or the grinding device of the present invention, for example, a long-sized plate having a weight of 100 kg or more and a total length of 100 m or more, or a wide-width plate having a width of 100 mm or more can be continuously produced, and A sheet with a small difference in thickness in the width direction. That is, according to the grinding method of the present invention or the grinding device of the present invention, the thickness difference in any direction in the width direction and the length direction of the sheet material can be made small, that is, the thickness difference across the full length is small. A magnesium alloy coil (representatively a coil of the invention). Further, according to the grinding method of the present invention or the grinding device of the present invention, since the thickness can be adjusted and the lubricant or the oxide layer can be removed, a magnesium alloy coil having a smooth surface and excellent surface properties can be produced. That is, according to the grinding method of the present invention or the grinding device of the present invention, the guiding of the thickness difference and the improvement of the surface properties can be achieved in one step.

In the coil material of the present invention, the thickness of the sheet material constituting the coil material in both the width direction and the longitudinal direction is uniform. In other words, the coil material of the present invention can be suitably used for, for example, a material of a magnesium alloy member to be subjected to plastic working (secondary processing) such as press working or forging. In particular, since the coil material of the present invention is composed of a long-sized sheet material, it is expected to contribute to mass production of the above-mentioned magnesium alloy member.

Further, the web of the present invention has a smooth surface by being subjected to grinding, and has a small surface roughness as described above across the entire length of the sheet material constituting the web. The surface roughness can be made smaller by changing the particle size of the abrasive grains of the grinding belt. For example, as one type of the coil material of the present invention, the surface roughness of the sheet material in the width direction is such that the maximum height Rz is 10 μm or less, the arithmetic mean roughness Ra is 0.6 μm or less, and the ten-point average roughness is obtained. The degree Rz is at least one condition of 6 μm or less, and further includes at least one condition that satisfies the maximum height Rz of 5 μm or less, the arithmetic mean roughness Ra of 0.3 μm or less, and the ten-point average roughness Rz of 3 μm or less. Type.

In one form of the coil material of the present invention, the sheet material has a width of 100 mm or more and a total length of 200 m or more, and the sheet material has a width of 200 mm or more and a total length of 400 m or more.

As a material to be supplied to the above-described grinding method of the present invention or the above-described grinding device of the present invention, calendering by using a wide-width and long-length material, for example, a rolled sheet having a width of 100 mm or more and a total length of 200 m or more is used. The coil material can be obtained from the wide and wide-sized coil of the present invention as described above. Further, as the material, a rolled web composed of a rolled sheet having a width of 200 mm or more and a total length of 400 m or more can be used to obtain a wider and wider size and longer size of the present invention as described above. Coil. Such a wide-width, long-sized coil material can be suitably used in the production of magnesium alloy members of various sizes, such as small parts such as parts for portable equipment and parts up to the conveyor equipment.

The type of the coil of the present invention may be a type in which the weight of the coil is 100 k g or more, and the weight of the coil is 200 k g or more.

The above-mentioned large-weight coil material may vary depending on the width or thickness of the sheet material constituting the coil material, but the thinner the thickness, for example, when the thickness of the sheet material is 1 mm or less, the full length is 200 m or more. Furthermore, it is a long-length material of 400 m or more, or a wide-width web of a width of 100 mm or more and further up to 200 mm or more. That is, the weight of the web can be utilized as an indicator showing that it is a long size or a wide width. Such a large-weight coil can also be produced by using a long-length material or a wide-width web as a material as described above.

The grinding method of the present invention or the grinding device of the present invention can be expected to be applied to a magnesium alloy in which various elements are added as elements (the balance being magnesium and impurities). In particular, an alloy having a high concentration of an additive element, specifically, a magnesium alloy having a total content of 7.3 mass% or more, has poor plastic workability at normal temperature (about 20 ° C), so it must be carried out as described above. Temperature rolling. Therefore, if a rolled sheet having a long dimension or a wide width is formed as described above, the grinding method of the present invention or the grinding device of the present invention is expected to be particularly suitable because the thickness variation tends to occur across the entire length. Applied in the addition of elements to a high concentration of magnesium alloy. Next, the coil of the present invention obtained by the grinding method of the present invention can also be obtained from a magnesium alloy having various compositions.

Specific additives are selected from the group consisting of Al, Zn, Mn, Si, Be, Ca, Sr, Y, Cu, Ag, Sn, Li, Zr, Ce and rare earth elements (except Y, Ce). At least 1 element. Examples of the impurities include Fe, Ni, and the like.

In particular, the aluminum-containing magnesium-aluminum alloy is excellent in corrosion resistance and excellent in mechanical properties such as strength and plastic deformation resistance. The higher the content of aluminum, the higher the effect is, and it is preferably 4.5% by mass or more, more preferably 7% by mass, and particularly preferably 7.3 % by mass or more. However, when the aluminum content exceeds 12% by mass, the plastic workability is lowered, so the upper limit is 12% by mass, and the upper limit is preferably 11% by mass.

A more specific composition of the magnesium-aluminum alloy may, for example, be an AZ-based alloy of the ASTM specification (Mg-Al-Zn alloy, Zn: 0.2% by mass to 1.5% by mass), or an AM-based alloy (Mg-Al-Mn). Alloy, Mn: 0.15 mass% to 0.5 mass%), Mg-Al-RE (rare earth element) alloy, AX alloy (Mg-Al-Ca alloy, Ca: 0.2% by mass to 6.0% by mass), AJ-based alloy (Mg-Al-Sr-based alloy, Sr: 0.2% by mass to 7.0% by mass).

In one aspect of the invention, the magnesium alloy contains 8.3 mass% or more and 9.5% by mass or less of aluminum.

The form containing 7.3 mass% or more and 12 mass% or less of aluminum, particularly in the form of 8.3% by mass to 9.5% by mass of aluminum as described above, is excellent in strength and excellent in corrosion resistance. As an alloy containing 8.3% by mass to 9.5% by mass of aluminum, and further containing 0.5% by mass to 1.5% by mass of the Mg-Al-Zn-based alloy containing zinc, a representative alloy is AZ91 alloy.

In the case of the above-mentioned elements, the content of each element is 0.00001% by mass or more and 20% by mass or less, and the total content is 50% by mass or less.

In particular, the magnesium alloy contains at least one element selected from the group consisting of Y, Ce, Ca, and a rare earth element (excluding Y, Ce) in an amount of 0.001% by mass or more, preferably 0.1% by mass or more in total. In the case of % or less (the rest is Mg and impurities, or the elements listed above, and the balance is Mg and impurities), it is excellent in heat resistance and flame resistance. The content of the rare earth element is preferably 0.1% by mass or more, and particularly preferably the Y content is 0.5% by mass or more.

In one aspect of the grinding apparatus of the present invention, the thickness of the center portion in the width direction of the grinding plate after grinding and the thickness of both edge portions are measured, respectively, on the downstream side of the grinding belt. The thickness measuring device on the downstream side and the measurement result of the thickness measuring device on the downstream side increase the conveying speed of the plate material and the rotation speed of the grinding belt according to the grinding amount of the grinding belt. The type of speed control unit.

When the thickness of the material supplied to the grinding device of the present invention differs greatly in the width direction, it is difficult to sufficiently narrow the difference even if feedforward control is performed as described above. In this case, by increasing the amount of grinding (absolute amount) of the material, it is expected that the above difference can be easily reduced. Here, in addition to the aforementioned feedforward control, a configuration in which feedback control can be performed is also proposed. Specifically, the thickness measuring device is disposed on the downstream side of the polishing tape as described above, and the difference in thickness in the width direction of the grinding plate after the grinding is measured, and the conveying speed of the plate is lowered in order to correct the difference. Slow), or increase the rotation speed of the grinding belt (to make it faster) to speed up the peripheral speed of the grinding belt. According to the above configuration, for example, in the case where a rolled plate having a large difference in thickness in the wide direction is used as the material, it is possible to more reliably produce a plate material having a small difference in thickness across the entire length thereof.

The difference between the full-length thickness of the magnesium alloy coil of the present invention and the magnesium alloy sheet of the present invention is small. The grinding method of the magnesium alloy coil of the present invention and the grinding apparatus for magnesium alloy of the present invention can produce a coil having a small difference in thickness over the entire length of the sheet material.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The same symbols in the figure show the same name.

[Implementation type 1]

A grinding device for a magnesium alloy according to Embodiment 1 will be described with reference to Fig. 1 . This grinding device 10 is a device that travels a long-sized sheet (hereinafter referred to as a material sheet 100) and grinds the surface thereof by the grinding belt 13. The long-sized material sheet 100 is wound up to form a coil, and is placed in the delivery cylinder 41 and sent out, and the ground material is ground by the grinding belt 13 to be ground (hereinafter referred to as a cutting board 1). By winding up the winding cylinder 42, the material sheet 100 and the grinding board 1 are integrated and continuously travel. The grinding device 10 is characterized in that it includes a so-called surface foreign matter such as a lubricant which is present on the surface of the material sheet 100 or an oxide layer formed on the surface of the material sheet 100, and reduces the thickness difference of the material sheet 100 in the width direction. mechanism.

First, the target material plate 100 will be described, and the grinding device 10 will be described in more detail later.

(material board)

Here, the material sheet 100 is a rolled roll obtained by winding up and rolling up a long rolled sheet made of a magnesium alloy. Rolled coil material, for example, a magnesium alloy is produced by a continuous casting method called a two-roll casting method, and a long-sized cast sheet is taken up, and the coiled coil is wound up, and at least one time is applied to the manufactured sheet. A long-sized calendered sheet is produced by rolling between the rolls to obtain the rolled sheet.

By using a continuous casting method capable of rapid solidification, it is possible to reduce oxides, segregation, and the like, and it is possible to suppress the formation of coarse crystal precipitates exceeding 10 μm. In particular, the twin-roll continuous casting method is excellent in both rigidity and thermal conductivity, and it is easy to form a cast plate having little segregation.

The thickness, width, and length of the aforementioned cast sheet can be appropriately selected. For example, when the thickness is 10 mm or less, and further, it is 7 mm or less, particularly 5 mm or less, segregation and the like are hard to exist, and the strength is excellent. In addition, a cast sheet having a length of 30 m or more, further 50 m or more, particularly 100 m or more, or a width of 100 mm or more, and further 200 mm or more, particularly 250 mm or more, is used as a material for the rolled sheet. In this case, a long-sized rolled sheet or a wide-width rolled sheet can be produced, and the rolled web of the rolled sheet can be taken up, and can be suitably used for a material of a plastic-worked member such as a press-worked member. Further, in particular, when the inner diameter of the cast coil material is small, it can be wound up in a state of being heated to 150 ° C or higher before the casting of the cast sheet, and it can be wound without being broken. Further, in the case where both edge portions (both sides in the width direction) of the slab are cast before the rolling, even if cracks occur at both edge portions of the cast sheet, it is possible to prevent the crack from continuing to develop in the pressurization. It is also possible to apply trimming to the rolled plate.

The rolling includes temperature rolling which is performed by heating the material containing the cast plate to 150 ° C or more and 400 ° C or less. By heating the material in the above temperature range and improving the plastic workability of the material, it is difficult to cause cracks even when the rolling reduction rate per pass is increased to, for example, 10% to 30%. Further, in the above temperature range, deterioration due to scorching or the like on the surface of the material can be suppressed, and thermal deterioration of the calender roll can be suppressed. The heating temperature of the material is preferably 350 ° C or lower, more preferably 300 ° C or lower, and particularly preferably 280 ° C or lower. In addition to the material, the calender roll is heated, and rolling can be performed by controlled rolling, other known conditions, etc., which are disclosed in JP-A-2007-098470. Further, after the cast plate is subjected to a solution treatment (for example, a heating temperature of 350 ° C to 420 ° C and a holding time of 1 hour to 40 hours), rolling may be performed.

The rolling including the above-described inter-temper rolling can be carried out in a plurality of passes by one pass. By rolling a plurality of passes, a rolled plate having a small thickness can be obtained, and the average crystal grain size of the structure constituting the rolled plate (for example, 10 μm or less, preferably 5 μm or less) can be reduced, or the press working can be improved. Plastic processing. The reduction ratio and the total reduction ratio of the passage number and the passage can be appropriately selected so that the rolled sheet having a desired thickness can be obtained.

The thickness, width, and length of the rolled sheet described above can be appropriately selected. In particular, when the rolled sheet is used for a material of a plastic working member of a press-formed member, the thickness is preferably 0.1 mm or more and 2.0 mm or less, and preferably 0.3 mm to 1.2 mm. Further, the length is 50 m or more, further 100 m or more, particularly 200 m or more, or a width of 100 mm or more, and further 200 mm or more, particularly a wide width of 250 mm or more, and these are used for the plastic working member. In the case of the material, the plastic working member can be continuously manufactured. That is, the rolled web of the above-mentioned long-length material or wide-width web can contribute to the improvement of the productivity of the above-mentioned plastic-worked member.

However, if the thickness of the rolled sheet constituting the rolled coil is a long dimension or a wide width as described above, the rolled sheet is likely to have a difference in the width direction or the longitudinal direction. Here, the difference in the thickness of the grinding device 10 is controlled so that the total length of the span is a desired thickness (for example, 0.1 mm to 2.0 mm).

(send the cylinder / take-up cylinder)

The rolled coil to be ground is placed in the delivery cylinder 41 and sent out, and the grinding belt 13 of the grinding device 10 is ground to form the cutting board 1. By winding the cutting plate 1 by the take-up cylinder 42, it is possible to manufacture a magnesium alloy coil having a small difference in thickness across the entire length.

The two cylinders 41 and 42 are controlled to operate by the cylinder driving unit 45 (Fig. 2). The cylinder drive unit 45 includes a so-called power means for a motor (not shown) that supplies a power source for rotating the cylinders 41 and 42, and an opening/closing that controls the rotation operation or the rotation of the cylinders 41 and 42. A cylinder control unit (not shown) such as a number (rotation speed) and a rotation direction. The cylinder control unit controls the number of rotations and the like by an instruction from a control unit 20 to be described later.

(grinding device)

The grinding device 10 includes a grinding mechanism that directly relates to the grinding of the material plate 100, and a thickness adjusting mechanism that contributes to reducing the difference in thickness of the material plate 100 when the material plate 100 is ground.

<grinding mechanism>

The grinding mechanism includes a grinding belt 13 for grinding the material sheet 100, a contact roller 11 and a wrap roller 14 that straddle the grinding belt 13, and an anti-wrap roller that is disposed at a position where the contact roller 11 is opposed to the material sheet 100. 12.

The grinding belt 13 is an infinite orbit (belt) having abrasive grains which are particle sizes. The aforementioned particle size (mesh size) can be appropriately selected, and the larger the number, the smoother the grinding plate can be manufactured. For example, the particle size can be appropriately used with #320 or more, and further #400 or more, particularly #600 or more.

The rotation direction of the grinding belt 13 may be the same as the conveying direction of the material sheet 100 (lower cutting), or may be one of the directions (upper cutting) opposite to the conveying direction, and the surface roughness may be reduced. In the case where the amount of grinding is increased, it is preferable to perform the upper cutting with high grinding efficiency.

The grinding belt 13 is such that the contact roller 11 is a driving roller that rotates with a power source such as a motor, and the traveling roller 14 is a driven roller, and the contact roller 11 rotates to drive the rotation. Further, the anti-wrap roll 12 disposed opposite to the material plate 100 is also rotated by a power source such as a motor. The rotation speed (circumferential speed) of the anti-wrap roll is equal to the conveyance speed (line speed) of the material sheet 100 (the grinding plate 1).

The material plate 100 is ground by a rotating grinding belt 13. At this time, the material sheet 100 is stably ground by being held by the contact roller 11 and the anti-wrap roll 12 . Further, the grinding plate 1 that has been ground by the rotation of the anti-wrap roll 12 is stably sent to the downstream side from the upstream side, and is taken up by the take-up reel body 42.

Further, here, a bearing (not shown) that rotatably supports the winding prevention roller 12 is configured to be movable in the thickness direction of the material sheet 100 (in the vertical direction in FIG. 1). By moving the anti-wrap roller 12 so as to move away from the contact roller 11 in accordance with a moving mechanism (not shown), the gap between the two rollers 11 and 12 can be adjusted to increase or decrease the amount of grinding.

Further, the grinding device 10 is provided with a roller adjusting means for increasing or decreasing the gap so that the size of the gap between the contact roller 11 and the yoke roller 12 is uneven. Next, in the grinding method of the present invention using the grinding device 10, the most important feature is that the adjustment operation of the roller adjusting means is performed during the grinding.

Here, as the roller adjusting means, a center cylinder 150 that can press the center portion of the anti-wound roller 12 in the wide direction and a pair of side cylinders 151 that can press the bearings disposed at both ends of the winding roller 12 are provided. 152. The entanglement roller 12 is held in a pressurized state by the cylinders 150 to 152 being held pressed against the contact roller 11 side.

For example, in the state in which the cylinders 150, 151, and 152 are pressed across the wide direction of the grinding belt 13 with a uniform pressing force, as shown in FIG. 3(I), the axial direction of the contact roller 11 and the anti-wrap are made. The two rolls 11, 12 are disposed such that the axial direction of the rolls 12 is parallel. In this case, the entire length of the spanning plate 100 in the wide direction (the horizontal direction in FIG. 3) is a substantially uniform thickness depending on the amount of grinding of the grinding belt 13.

For example, in a state where the anti-wrap rolls 12 are pressed by the side cylinders 151, 152 with uneven pressing force, as shown in Fig. 3 (II), the extension of the shaft of the anti-wrap roll 12 is brought into contact with each other. The two rolls 11, 12 are disposed in such a manner that the extension of the shaft of the roller 11 intersects. In this case, depending on the amount of grinding of the grinding belt 13, the width direction of the material sheet 100 (the horizontal direction in FIG. 3) is from the edge portion side (here, the left side) to the other side edge portion side ( Here is the right side) in order. Further, in FIGS. 3(II) to (IV), the degree of inclination or the degree of deformation of the anti-wrap roll 12 is exaggeratedly displayed.

For example, in a state where the anti-wrap roller 12 is pressed by a larger pressing force than the side cylinders 151, 152 by the center cylinder 150, as shown in Fig. 3 (III), the center of the wrap-around roller 12 in the width direction is made. The portion is pressed up to approach the contact roller 11, and both edge portions in the wide direction are deformed and disposed so as to be separated from the contact roller 11, that is, the wrapping roller 12 is bent. In this case, depending on the amount of grinding of the grinding belt 13, the center portion of the material sheet 100 in the width direction is large, and the center portion is sequentially reduced toward each edge portion.

For example, in a state where the anti-wrap roller 12 is pressed by a larger pressing force than the center cylinder 150 by the both side cylinders 151, 152, as shown in Fig. 3 (IV), the anti-wound roller 12 is oriented in the width direction. Both edge portions are pressed to approach the contact roller 11, and the center portion in the wide direction is deformed and disposed so as to be separated from the contact roller 11, that is, the wrap-proof roller 12 is bent. In this case, depending on the amount of grinding of the grinding belt 13, both edge portions in the width direction of the material sheet 100 are large, and the edge portions are sequentially reduced toward the center portion.

Here, the anti-wound roller 12 is configured to be movable/tilted/deformed. For example, the contact roller 11 may be configured to be movable/tilted/deformed, or both rollers 11 and 12 may be movable. / Tilt / deformation composition. Further, it is of course possible to tilt and deform the anti-wrap roll 12 as described above before the start of the grinding. For example, in the case of a wide and wide sheet material which is not a long size, the difference in thickness in the width direction is measured in advance, and according to the measurement result, the anti-wrap roll 12 is inclined and deformed so that even if it is a sheet material, it is ground. It is also possible to reduce the thickness difference in the wide direction.

The contact roller 11 and the anti-wrap roller 12 are controlled to operate by the roller drive unit 15 (Fig. 2). The roller drive unit 15 includes a so-called power means (not shown) for supplying a power source for rotating the rollers 11 and 12 as described above, and on/off or rollers 11 and 12 for performing a rotation operation. The number of rotations (rotation speed), the control of the movement mechanism of the anti-wrap roll 12, and the roller control unit (not shown) that controls the roller adjustment means. The roller control unit controls the roller adjusting means by tilting or deforming the anti-wrap roller 12 as described above by an instruction from a control unit 20 to be described later, or controls the number of rotations of the contact roller 11 or the anti-wrap roller 12. .

<thickness adjustment mechanism> Sensor

The grinding device 10 includes a thickness measuring device (forward sensor 31) disposed on the upstream side of the grinding belt 13 and a thickness measuring device disposed on the downstream side of the grinding belt 13 in order to measure the thickness of the traveling material sheet 100. (Retraction sensor 35).

The forward sensor 31 includes a center sensor 31c that measures the thickness of the center portion of the material sheet 100 in the width direction, and a side sensor 31e that measures the thickness of both edge portions of the material sheet 100. The back sensor 35 includes a center sensor 35c that measures the thickness of the center portion in the width direction of the grinding plate 1 on which the material plate 100 is subjected to grinding, and one side of the thickness of each edge portion of the material plate 100. Side sensor 35e.

The distance from the grinding belt 13 to the sensors 31 and 35 can be appropriately selected. When the component for removing the grinding fluid to be described later is provided, when the back sensor 35 is provided downstream of the component, it is expected to reduce the measurement error caused by the grinding fluid. Here, the side sensors 31e and 35e are disposed so that the distance We from the side edges of the material sheet 100 or the grinding board 1 is 20 mm, and the thickness of the spot is the thickness of the both edge portions. .

The grinding step using the grinding device 10 is basically performed at room temperature, so that each of the aforementioned sensors 31, 35 can utilize a contact or non-contact type sensor. Here, a laser displacement meter using a non-contact sensor is used. The laser displacement meter can easily measure the thickness at any position even when the material sheet 100 has a wide width, so that it can be easily used.

Control Department

The grinding device 10 is provided with information for receiving the sensors 31 and 35 to operate the roller adjusting means or to adjust the rotational speed of the contact roller 11 or the anti-wrap roller 12, the delivery cylinder 41 or the take-up cylinder 42. Control unit 20.

As shown in FIG. 2, the control unit 20 includes a feed control unit 20f that controls the roll adjustment means based on information from the forward sensor 31, and controls the above-described roll drive unit 15 based on information from the backward sensor 35. The roller control unit or the feedback control unit 20b of the cylinder control unit of the cylinder drive unit 45.

The feedforward control unit 20f includes: a pre-entry input means 21 for acquiring the information from the forward sensor 31, and a calculation method 22 for calculating the thickness difference of the material board 100 based on the input information, and determining whether or not to proceed based on the difference The driving advance determination means 23 of the roller adjusting means and the advance command means 24 for issuing the command to the roller driving section 15 by appropriately driving the roller adjusting means based on the determination result. In addition, the feedforward control unit 20f and the feedback control unit 20b, which will be described later, include a memory means (not shown) for storing a set value or the like.

The feedback control unit 20b includes a back-feed input means 25 for acquiring the information from the back sensor 35, and a calculation method 26 for calculating the thickness difference of the cutting board 1 based on the input information, and determining whether or not to change the contact based on the difference. The rotation speed retreat determining means 27 of the roller 11, the wrapping roller 12, the feeding cylinder 41, and the winding cylinder 42 and the rotation driving speed of the rollers 11 and 12 are appropriately issued to the roller driving unit 15 based on the determination result. The command or the retreat command means 28 that issues a command to the cylinder drive unit 45 in order to appropriately change the rotational speed of the tubular bodies 41, 42.

Here, the control unit 20 is configured to include both the feedforward control unit 20f and the feedback control unit 20b. However, the control unit 20 may be a grinding device having an individual control unit. Further, the control unit 20 can appropriately use a circuit board having a CPU, a computer having the substrate, and the like. The grinding device 10 may further include a direct input means such as a keyboard or a display device such as a monitor.

(other components)

On the other hand, in the case of grinding a material composed of a magnesium alloy, it is preferable to carry out the wet method using a grinding liquid so that the cut powder is hard to be scattered. In the case of performing the grinding according to the wet method, it is possible to arrange a spray nozzle which is disposed upstream or downstream of the grinding belt and sprays the grinding fluid onto the grinding roller or the material plate, and is disposed downstream of the grinding belt to discharge the washed powder or The cleaning nozzle of the cleaning liquid of the grinding liquid, the liquid suction roller of the cleaning liquid or the grinding liquid, and the blowing nozzle for blowing the wind at a suitable temperature (for example, warm air) so that the cleaning liquid can be sufficiently removed. Wait. By sufficiently wiping and drying the grinding liquid or the cleaning liquid, it is possible to suppress the deterioration of the surface properties due to the adhesion of these liquids, and to produce the grinding board 1 which is more excellent in surface properties.

(Adjustment step of thickness difference)

Hereinafter, a step of adjusting the thickness difference will be described using the grinding device 10 having the above configuration with reference to Fig. 4 .

First, at the time of grinding according to the grinding device 10, the particle size of the abrasive grains of the grinding belt 13, the gap between the contact roller 11 and the entanglement roller 12, the rotational speed of the contact roller 11, and the rotational speed of the contact roller 11 are set so as to have a desired amount of grinding. The rotation speed of the cylinder 41 and the take-up cylinder 42 is sent out. The aforementioned amount of grinding is determined on the assumption that the material (for example, a magnesium alloy rolled web) has a uniform thickness across its entire length. In this case, the amount of grinding (removing the thickness) of the material in the wide direction is uniform. Moreover, the conveyance speed of the material board 100 and the grinding board 1 is determined by the rotation speed of the two cylinders 41 and 42, and the rotation speed of the anti-wrap roll 12 is made equal to this conveyance speed.

The delivery cylinder 41 is disposed and wound back into a material to be material, and one end of the material plate 100 (for example, a rolled plate) is wound around the winding cylinder 42 and the two cylinders 41 and 42 are rotated to make the material. The plate 100 and the grinding plate 1 travel. Further, if the specific length including the one end to be wound is not subjected to grinding, and the grinding and thickness adjustment are performed after the traveling is stabilized, it is expected that the thickness difference guide can be stably performed.

Here, after the start of the grinding, the forward sensor 31 and the backward sensor 35 are configured to measure the thickness at any time.

<Feed Forward Control>

Hereinafter, the steps of feedforward control will be specifically described.

The center portion thickness t _c of the width direction of the traveling material sheet 100 and the thickness t _{e1 of the} both edge portions are respectively measured by the center sensor 31c of the forward sensor 31 and the side sensor 31e. , t _e2 , the control unit 20 advances the input means 21 to obtain the thicknesses t _c , t _e1 , t _e2 (step S1).

Next, the control unit 20 advances the calculation means 22 to calculate the difference in thickness of the material board 100. Here, the magnitude relationship of the aforementioned thicknesses t _c , t _e1 , t _e2 is obtained (t ₁ ≦t ₂ ≦t ₃ , t _n ={t _c , t _e1 , t _e2 }), and the maximum value is calculated: t ₃ and Minimum value: difference between t ₁ (hereinafter referred to as advance difference): x _f = t _{3 -} t ₁ (step S2).

Next, the control unit 20 advances the determination means 23 to compare the forward difference: x _f with the threshold value, and determines whether or not the gap between the contact roller 11 and the entanglement roller 12 is to be changed. Specifically, the threshold value is 40 μm, and the difference in advance is determined: whether or not x _f satisfies 40 μm or less (step S3).

Advance difference: When x _f satisfies 40 μm or less, the difference in thickness in the width direction of the material sheet 100 is considered to be small. Here, in this case, the gap between the contact roller 11 and the entanglement roller 12 is not changed.

On the other hand, the difference in advancement is not satisfied when x _f is less than 40 μm, that is, when the thickness exceeds 40 μm, the thickness variation of the material sheet 100 in the width direction is large, and it is considered to be necessary for guiding. Here, the difference in thickness in the width direction of the material sheet 100 is specifically investigated. Here, when it is investigated whether or not any of the center portion and each of the edge portions of the material sheet 100 is thick, the forward determination means 23 determines whether or not the _{e e1} is satisfied, using the previously obtained magnitude relationship t ₁ ≦t ₂ ≦t ₃ as an index. , t _e2 < t _c (step S4).

When t _e1 , t _e2 < t _c is satisfied, t _c is too thick, that is, the center portion of the material sheet 100 in the width direction is thicker than the both edge portions, so that the center portion is made thin. Specifically, the forward command means 24 commands the roller control unit of the roller drive unit 15 to drive the center cylinder 150 (step S5), and deforms the anti-wrap roll 12 as shown in Fig. 3 (III). The amount of grinding in the center portion is larger than that in the above-mentioned both edge portions. Further, the amount of pressing of the center cylinder 150 and the side cylinders 151 and 152 is set in advance in accordance with the value of the forward difference: x _f , and each of the cylinders 150, 151, and 152 is first set to press only the predetermined amount.

When t _e1 and t _e2 < t _c are not satisfied, the advance determination means 23 further determines whether or not t _e1 and t _e2 > t _c are satisfied (step S6). When t _e1 , t _e2 &gt; t _c is satisfied, t _{c is} too thin, and t _e1 , t _{e2 are} too thick, that is, both edge portions of the material sheet 100 are thicker than the center portion, so that the both edge portions are thinned. Specifically, the forward command means 24 commands the roller control unit of the roller drive unit 15 so as to drive the side cylinders 151 and 152 (step S7), and deforms the anti-wrap roller 12 as shown in Fig. 3 (IV). The amount of grinding of the both edge portions is made larger than the amount of grinding of the center portion.

When t _e1 and t _e2 > t _c are not satisfied, the advance determination means 23 further determines whether or not t _e1 > t _e2 is satisfied (step S8). When t _e1 > t _e2 is satisfied, t _{e2 is} too thin, and t _e1 is too thick, that is, one edge portion of the material sheet 100 is thicker than the center portion or the other edge portion in the width direction, so that one side is made The edge portion is thinned. Specifically, the forward command means 24 commands the roller control unit of the roller drive unit 15 to drive the side cylinders 151 and 152 (here, the side cylinder 151) (step S9) to become the same as FIG. 3 (FIG. 3). The inclination of the opposite inclination shown in II) (the inclination extending to the lower right in FIG. 3) is such that the anti-wrap roll 12 is inclined, and the amount of grinding is sequentially decreased from one edge portion toward the other edge portion. On the other hand, when less than _{e e1} > t _e2 , the other edge portion is too thick. Therefore, in order to make the thickness of the other thinner, the advance command means 24 is driven to the roller control portion of the roller drive unit 15 The side cylinders 151, 152 (here, the side cylinders 152) are commanded (step S10), and the winding prevention roller 12 is tilted as shown in Fig. 3 (II).

By appropriately tilting or deforming the anti-wrap roll 12 as described above, the state in which the material sheet 100 is pressed against the grinding belt 13 in a wide direction is partially different, and the contact roller 11 and the anti-wrap roll 12 can be made between The size of the gap in the width direction becomes uneven. That is, the amount of grinding in the width direction of the material sheet 100 can be partially different, and the difference in thickness in the width direction can be guided.

<feedback control>

With the aforementioned feedforward control, the difference in thickness in the width direction of the material sheet 100 can be reduced. Further, in the grinding device 10, the difference can be more reliably reduced by the following feedback control. Hereinafter, the steps of the feedback control will be specifically described.

The center portion thickness t _c of the width direction of the traveling cutting plate 1 and the thickness t _{e1 of the} both edge portions are respectively measured by the center sensor 35c of the back sensor 35 and the side sensor 35e. , t _e2 , the control unit 20 retreats the input means 25 to obtain the thicknesses t _c , t _e1 , t _e2 (step S11).

Next, the control unit 20 follows the calculation means 26 and calculates the difference in the thickness of the cutting board 1. Specifically, the magnitude relationship of the aforementioned thicknesses t _c , t _e1 , t _e2 is obtained (t ₁ ≦t ₂ ≦t ₃ , t _n ={t _c , t _e1 , t _e2 }), and the maximum value is calculated: t ₃ The difference from the minimum value: t ₁ (hereinafter referred to as a back difference): x _b = t _{3 -} t ₁ (step S12).

Next, the backward determination means 27 of the control unit 20 compares the backward difference: x _b with a threshold value, and determines whether or not the amount of grinding is to be increased. Specifically, the threshold value is 40 μm, and it is determined whether or not the difference in retreat: x _b satisfies 40 μm or less (step S13).

Regression difference: When x _b satisfies 40 μm or less, the thickness of the grinding plate 1 after grinding is sufficiently guided by the grinding according to the feedforward control, and the difference in thickness in the width direction of the grinding plate 1 should be Very small. Here, in this case, the change in the amount of grinding is not performed.

On the other hand, the difference in retreat: when x _{b does} not satisfy 40 μm or less, that is, when the thickness exceeds 40 μm, the difference in thickness in the width direction of the material sheet 100 is very large, and it is considered that it is difficult to sufficiently guide only by feedforward control. The difference is the aforementioned. Here, in order to increase the amount of grinding in a manner in which the difference is sufficiently corrected for the material sheet 100 that has not been subjected to grinding in the measurement space, the conveying speed of the material sheet 100/the grinding board 1 is slowed down, or the grinding belt 13 is accelerated. The speed of rotation. Specifically, the retracting command means 28 commands the roller control unit of the roller drive unit 15 to increase the rotational speed of the contact roller 11, or the roller control unit reduces the rotational speed of the anti-wrap roller 12, and the cylinder. The cylinder control unit of the drive unit 45 commands the lowering of the rotational speed of the delivery cylinder 41 or the take-up cylinder 42 (step S14).

By repeating each of the steps S1 to S14 at any time, even if the material sheet 100 is a long-sized material or a wide-width web, the slab 1 having a uniform thickness across the entire length can be obtained.

<Modification of determination step>

In the foregoing steps, the maximum and minimum values of the thicknesses t _c , t _e1 , t _e2 of the material plate 100 and the grinding plate 1 are used to describe the difference in thickness difference, but the above steps are not limited. For example, the steps described below can be employed.

Using the aforementioned thicknesses t _e1 , t _c , t _e2 , each calculation means, the difference between the three thicknesses is obtained, for example, t _{e1 -} t _c , t _{e1 -} t _e2 , t _{c -} t _e2 . Each of the determination means determines whether or not the difference is equal to the threshold (here, within ±20 μm).

Next, in the case of the feedforward control, the forward command means commands the roller drive unit so as to change the gap between the contact roller and the anti-wrap roller based on the difference in the threshold value. For example, when t _{e1 -} t _c is a negative value and is less than the threshold value, t _c is too thick, that is, the center portion of the material sheet 100 in the thickness direction is excessively thicker than the one edge portion. In this case, when t _c -t _e2 satisfies the threshold value or when the positive value is less than the threshold value, the center portion of the material sheet 100 is excessively thicker than the both edge portions, so that the center portion is thinned and the anti-wrap is made The roller 12 is deformed (refer to Fig. 3 (III)). Alternatively, when t _c -t _e2 is a negative value and is less than the threshold value, the material sheet 100 is gradually thicker from one edge portion toward the other edge portion, so that the edge portion of the other edge is thinned toward one edge portion. The manner of tilting the anti-wrap roll 12 (refer to Fig. 3 (II)).

On the other hand, in the case of the feedback control, as long as the difference is less than the threshold value, the command means is retracted in the same manner as the above-described step (step S12 and later), and the roller drive unit or the cylinder drive unit is commanded to adjust the amount of grinding.

(effect)

According to the grinding method of the present invention using the above-described grinding device 10, the difference in thickness in the width direction of the material sheet 100 is measured before the grinding belt 13, so that the gap between the contact roller 11 and the anti-wrap roller 12 is in the width direction thereof. The size of the material is increased or decreased in a non-uniform manner, and even if the material sheet 100 is a long-sized material or a wide-width web, the slab 1 having a uniform degree across the entire width and length directions can be obtained. In addition, the grinding plate 1 is wound up, for example, in a total length of 200 m or more, further 400 m or more, and a width of 100 mm or more, further 200 mm or more, and a weight of 100 kg or more, and further a length of 200 kg or more. Material or wide web, the difference in thickness can be reduced across its entire length as described above (for example, the difference is within 40 μm), and the surface is smooth (for example, surface roughness in a wide direction, satisfying the maximum height Rz) It is a magnesium alloy coil of 20 μm or less, an arithmetic mean roughness Ra of 1.2 μm or less, and at least one of ten-point average roughness Rz of 12 μm or less. The obtained magnesium alloy coil or the magnesium alloy sheet which is cut into a specific length can be suitably used for a material which is subjected to plastic processing by so-called press working.

[Implementation 2]

In the foregoing embodiment 1, the types of both the feedforward control and the feedback control can be described. As another mode of the grinding device of the present invention, it is possible to adopt a type in which only feedforward control is performed. Specifically, in addition to the back-off sensor 35 and the feedback control unit 20b, the steps S1 to S10 may be repeated.

[Modification 1]

In order to obtain a smoother and more uniform surface, the grinding can be carried out in multiple stages. In this case, the particle size of the abrasive grains in all the grinding steps may be the same or different. For example, it is possible to adopt a grinding step in the upstream, and to use a grinding belt having a small particle size (number) to increase the amount of grinding, and to adjust the thickness mainly, and in the grinding step on the downstream side, a grinding belt having a large particle size is used. Mainly seeking the smoothing of the surface. At this time, in the grinding step on the downstream side, the thickness adjustment mechanism may be operated without being subjected to grinding.

[Modification 2]

In the above embodiment, a form in which one side of the material sheet 100 is ground is displayed, but a form in which both sides of the material sheet 100 can be ground may be employed. Specifically, it may be provided to hold the material sheet 100. The type of a pair of grinding belts configured in the manner of the back of the watch.

[Test example]

The magnesium alloy grinding apparatus 10 of the above-described embodiment 1 was used for grinding, and the difference in thickness and surface roughness of the obtained long-sized sheet material were examined.

In this test, a soup of magnesium alloy equivalent to the composition of AZ91 alloy (Mg-8.7% Al-0.65% Zn (all mass%)) was prepared, and a casting plate having a thickness of 4 mm was continuously produced by a twin-roll casting machine. It is taken up and a cast coil is produced. This cast coil was placed in a batch furnace and subjected to a solution treatment at 400 ° C for 24 hours. The solid solution coil obtained by winding back was wound up by rolling several times under the following conditions to produce a rolled coil having a target thickness of 0.6 mm, a width of 250 mm, and a length of 800 m. The rolled web was wound up, ground by a grinding device 10, and the obtained grinding plate was taken up to prepare a magnesium alloy coil (width 250 mm, length 760 m, 200 kg). The particle size of the abrasive grains of the belt was ground using a #600, wet-type grinding. In addition, when winding up, the appropriate length is adjusted.

(calendering conditions)

Reduction rate: 5% / after ~40% / after

Heating temperature of the material: 250 ° C ~ 280 ° C

Roller temperature: 100 ° C ~ 250 ° C

The rolled magnesium alloy coil was wound up, and the trimming material cut by 5 m at both ends was cut every 10 m to prepare a sheet of 10 m. For each of the 10 m sheets, the center portion of the width direction of each of the sheets is taken, and a straight line passing through the width direction of the center portion of the ruler is taken, and the distance from the edge portion to the distance of 20 mm is present with the center. The total amount of the parts was 3 points, and the thickness was measured. The thickness can be measured by using an X-ray or the like in addition to a measuring device such as a laser displacement meter. The average thickness of 3 points for all 10m sheets was averaged to 0.590 mm, which is almost the target thickness.

Further, each thickness of the measurement was 0.570 to 0.610 mm, and when the difference between the maximum value and the minimum value of the thickness of the three points measured was 10 mm each of the sheets, the thickness of all the sheets of 10 m was The difference in thickness is below 40 μm.

Further, the surface roughness of each 10 m sheet was measured. The surface roughness was measured by taking a test piece from each of 10 m sheets each including a place where the thickness was measured. That is, three test pieces were taken from a single sheet along the width direction. That is, the surface roughness in the width direction of the sheet was measured for each test piece. A commercially available measuring device can be suitably used for the measurement of the surface roughness. Here, the surface roughness measuring machine manufactured by Mitutoyo was measured according to the industrial standard JIS B 0601 (2001) (measurement length: 4 mm). As a result, any of the test pieces was satisfied. The maximum height Rz (=maximum height Rmax) is 20 μm or less, the arithmetic mean roughness Ra is 1.2 μm or less, and the ten-point average roughness Rz is 12 μm or less. That is, it is understood that the coil obtained by using the above-mentioned grinding device has a small surface roughness in both the longitudinal direction and the wide direction, and the difference in the longitudinal direction and the wide direction is small.

Further, the present invention is not limited to the above-described embodiments, and can be appropriately modified without departing from the gist of the invention. For example, the composition (type and content of the additive element) of the magnesium alloy can be appropriately changed to form the thickness, width, length, and the like of the sheet material of the coil.

[Industry use possibility]

The magnesium alloy coil of the present invention and the magnesium alloy sheet of the present invention can be suitably used for various kinds of magnesium alloy members which are subjected to various plastic working such as press working, forging or bending, for example, portable or small electric Components such as various types of electrical/electronic equipment such as a casing, an outer casing, and a chassis of an electronic device, a constituent member of a transportation machine such as an automobile or an airplane, an exterior member such as a bag, and a skeleton member. The grinding device for a magnesium alloy of the present invention and the grinding method for the magnesium alloy coil of the present invention can be suitably used for the production of the magnesium alloy coil of the present invention.

1. . . Grinding board

100. . . Material board

10. . . Grinding device

11. . . Contact roller

12. . . Anti-wrap roll

13. . . Grinding belt

14. . . Swimming roller

15. . . Roller drive

150. . . Central cylinder

151, 152. . . Side cylinder

20. . . Control department

20f. . . Feedforward control unit

20b. . . Feedback control

twenty one. . . Forward input means

twenty two. . . Forward calculation

twenty three. . . Advance judgment

twenty four. . . Forward command means

25. . . Back input means

26. . . Backward calculation

27. . . Regression judgment means

28. . . Back command

31. . . Forward sensor

31c, 35c. . . Central sensor

31e, 35e. . . Side sensor

35. . . Backward sensor

41. . . Send out the cylinder

42. . . Take-up cylinder

45. . . Cylinder drive unit

Fig. 1 is a schematic configuration diagram of a grinding device for a magnesium alloy according to Embodiment 1.

Fig. 2 is a functional block diagram of a control unit provided in the grinding device for magnesium alloy according to the first embodiment.

Fig. 3 is an explanatory view showing a configuration pattern of a contact roller and an anti-wrap roller in a grinding device for a magnesium alloy according to Embodiment 1.

Fig. 4 is a flow chart showing an example of a procedure for adjusting the thickness when grinding a material using a grinding device for a magnesium alloy according to the first embodiment.

1. . . Grinding board

10. . . Grinding device

11. . . Contact roller

12. . . Anti-wrap roll

13. . . Grinding belt

14. . . Swimming roller

20. . . Control department

31. . . Forward sensor

31c, 35c. . . Central sensor

31e, 35e. . . Side sensor

35. . . Backward sensor

41. . . Send out the cylinder

42. . . Take-up cylinder

100. . . Material board

150. . . Central cylinder

151, 152. . . Side cylinder

We. . . distance

Claims (10)

A magnesium alloy coil material, which is a magnesium alloy coil material obtained by winding a long-sized sheet material composed of a magnesium alloy, characterized in that the magnesium alloy contains a total of 7.3 mass% or more of the added elements, and the thickness of the above-mentioned sheet material is 2.0 mm. In the following, the width of the sheet material is 200 mm or more, and the surface roughness in the width direction of the sheet material is such that the maximum height Rz is 20 μm or less, or the arithmetic mean roughness Ra is 1.2 μm or less, or The ten-point average roughness Rz is at least one condition of 12 μm or less; the thickness of the sheet material in the width direction is within 40 μm. The magnesium alloy coil according to claim 1, wherein the magnesium alloy contains 7.3 mass% or more and 12 mass% or less of aluminum. The magnesium alloy coil according to claim 1 or 2, wherein the magnesium alloy contains 8.3 mass% or more and 9.5 mass% or less of aluminum. The magnesium alloy coil according to claim 1 or 2, wherein the total length of the plate material is 200 m or more. A magnesium alloy coil according to claim 1 or 2, wherein the weight of the coil is 100 kg or more. A magnesium alloy coil according to claim 1 or 2, wherein the total length of the plate material is 400 m or more. A magnesium alloy coil according to claim 1 or 2, wherein the weight of the coil is 200 kg or more. A grinding device for a magnesium alloy, which is a grinding device for a magnesium alloy for grinding a sheet material which is fed by a coil made of a magnesium alloy, and is characterized in that the total content of the additive elements for grinding the magnesium alloy is 7.3 mass% or more. The grinding belt of the above-mentioned plate material having a thickness of 2.0 mm or less and a width of 200 mm or more is disposed on the upstream side of the grinding belt, and measures the thickness of the center portion in the width direction of the sheet material and the upstream side of the thickness of both edge portions. The thickness measuring device, the contact roller that rotates the grinding belt, and the gap in the width direction of the gap between the contact roller and the billet roll that holds the plate material together are increased or decreased in the gap. a roller adjusting means for differently pressing a portion of the sheet material in a wide direction, and a measurement result of the thickness measuring device on the upstream side, the entire length of the grinding board after the grinding is made so that the width of the grinding board is wide a control unit that operates the roller adjusting means within a range of 40 μm or less, and a downstream side of the grinding belt The thickness measuring device on the downstream side in the width direction of the grinding plate after the grinding, and the thickness measuring device on the downstream side of the thickness of the both edge portions, and the grinding belt are added in order to measure the thickness of the thickness measuring device on the downstream side. The amount of grinding is controlled by at least one of the conveying speed of the sheet material and the rotation speed of the grinding belt. A grinding method for a magnesium alloy coil, characterized in that: for a magnesium alloy containing 7.3 mass% or more in total of added elements The sheet material having a thickness of 2.0 mm or less and a width of 200 mm or more which is fed by the formed web is measured, and the thickness of the center portion in the width direction and the thickness of both edge portions are measured, and the grinding is performed in order to reduce the variation in the thickness. The contact roller of the belt is formed so that the gap between the contact roller and the billet roll that holds the plate material together is uneven, and the gap is increased or decreased, and the gap is transferred between the adjusted gaps. The plate material is ground by the grinding belt, and the thickness of the center portion in the width direction of the plate material after the grinding and the thickness of both edge portions are measured, and the difference in the positive thickness is increased to increase the grinding amount of the grinding belt for grinding. The total length of the slab after the lap grinding is such that the variation of the thickness of the slab in the width direction is within 40 μm. A magnesium alloy sheet characterized by cutting a magnesium alloy coil of any one of claims 1 to 7 into a specific length.