JP5656112B2 - Method for producing magnesium alloy member - Google Patents

Description

  The present invention relates to a method for manufacturing a magnesium alloy member that has been subjected to press working. In particular, the present invention relates to a production method capable of producing a magnesium alloy member having an anticorrosion layer such as a chemical conversion layer or an anodized layer or a coating layer with high productivity.

  A magnesium alloy that is lightweight and excellent in specific strength and specific rigidity has been used as a constituent material of various members such as a casing of a portable electric / electronic device such as a mobile phone and a notebook personal computer, and an automobile part.

  As for the members made of magnesium alloy, casting materials (ASTM standard AZ91 alloy) by die casting method or thixo mold method are mainly used. In recent years, a member obtained by pressing a plate made of a magnesium alloy for extension represented by ASTM standard AZ31 alloy is being used. Patent Document 1 discloses a pressed member obtained by rolling a cast plate made of a magnesium alloy equivalent to the AZ91 alloy in the ASTM standard by a twin roll continuous casting method, and pressing the rolled plate.

  By performing a pretreatment such as degreasing → acid etching → desmutting → surface adjustment on the pressed member, a corrosion prevention treatment such as a chemical conversion treatment is performed to form an anticorrosion layer (specifications 0033 and 0034 of Patent Document 1). The corrosion resistance of the pressed member can be improved. Further, by forming a coating layer on the anticorrosion layer (specification 0033 of Patent Document 1), the corrosion resistance can be further improved and the commercial value can be increased. The anticorrosion treatment for the magnesium alloy includes anodizing treatment in addition to the chemical conversion treatment.

JP 2009-120877

  However, conventionally, when manufacturing a magnesium alloy member having an anticorrosion layer or a coating layer, the number of steps is large, the efficiency is low, and it is desired to improve productivity.

  As described above, after press-molding into a predetermined shape, when forming the anticorrosion layer or further forming a coating layer on the anticorrosion layer, for each pressed member, the above pretreatment, anticorrosion treatment, It is necessary to paint appropriately and is complicated. Moreover, when using a jig | tool so that pre-processing and anticorrosion processing can be performed at once, it takes an effort to arrange | position the press-work member of various shapes in a jig | tool. In addition, when a long rolled material is prepared and press molding is performed on a plate material cut into an appropriate size, a cutting process is necessary. Thus, there are many processes and it is inferior to productivity.

  Then, the objective of this invention is providing the manufacturing method of the magnesium alloy member which can manufacture the magnesium alloy member which provides anticorrosion layers, such as a chemical conversion layer, with sufficient productivity.

  Compared to die-casting materials and thixo-mold materials, plastic working materials such as rolled materials are reduced in defects during casting or refined crystals, so even if they have the same composition, strength, toughness, etc. Excellent mechanical properties. In addition, a long rolled plate can be manufactured by rolling a cast material manufactured by a continuous casting method such as a twin roll continuous casting method. Therefore, although the present invention uses this long rolled plate as a material, it does not perform the anticorrosion treatment after producing a press-worked member from this material, but sequentially applies the anticorrosion treatment to the long rolled plate, as it is. The above-mentioned object is achieved by continuously pressing.

The present invention relates to a method of producing a magnesium alloy member by pressing a plate material made of a magnesium alloy, and includes the following preparation process, anticorrosion process, and molding process.
Preparation step: a step of preparing a rolled coil material in which a long rolled plate is wound up. Corrosion prevention step: a step of unwinding the rolled coil material and subjecting the rolled plate to an anticorrosion treatment to produce an anticorrosion treatment plate. A step of producing a magnesium alloy member by subjecting the anticorrosion treatment plate to progressive press processing following the anticorrosion treatment without winding up the anticorrosion treatment plate.

  According to the said structure, anti-corrosion treatment and press work can be easily performed continuously to a raw material board by rewinding the coil material used as a raw material, and finally winding up and making a raw material board drive | work. Moreover, according to the said structure, there is no winding-up operation | work from an anticorrosion process to a press work, and a press work member is produced as a continuation from an anticorrosion process to a press process. Therefore, compared with the manufacturing method which performed the anti-corrosion process for every press work member, the arrangement | positioning process etc. to the jig | tool mentioned above can be skipped, and the said this invention manufacturing method has good working efficiency. Therefore, the production method of the present invention can produce a magnesium alloy member that is pressed and has an anticorrosion layer with high productivity. In particular, the above-described configuration is a simple shape such as a plate material that is substantially flat instead of a concave-convex shape or a three-dimensional shape in which the material subjected to the anticorrosion treatment has protrusions such as ribs and bent portions. Therefore, even if the material is a long material or a wide material, the anticorrosion treatment can be easily and continuously performed. As described above, the production method of the present invention can contribute to the mass production of the magnesium alloy member, and it is expected that the cost can be reduced by improving the working efficiency.

  Furthermore, since the magnesium alloy member obtained by the manufacturing method of the present invention is a plastic working member obtained by pressing a rolled plate, mechanical properties such as strength and toughness compared to a die-cast material and a thixo mold material. Excellent. Moreover, this magnesium alloy member is excellent also in corrosion resistance by providing an anticorrosion layer.

  As one form of this invention, the said forming process WHEREIN: The form which performs the said progressive press process in the state which has arrange | positioned the lubricating sheet on both surfaces of the said anticorrosion processing board is mentioned.

  According to the above embodiment, even when relatively strong processing such as a small bending radius is performed, the presence of the lubricating sheet hardly causes cracks and cracks, and is excellent in formability, and the magnesium alloy base material. Seizure can be prevented. Moreover, since the anticorrosion layer can be sufficiently protected by this lubricating sheet, even in the bent portion, the base material of the magnesium alloy and the anticorrosion layer are hardly scratched, and the press workability is excellent. In particular, if the lubricating sheet is made of a continuous long material and the lubricating sheet travels along with the traveling of the anticorrosion treatment plate, the lubricating sheet can be easily and reliably placed in the molding region of the anticorrosion treatment plate, Efficiency is good. In addition, when the bending radius is large or the like and molding is possible without using the lubricating sheet, the lubricating sheet may not be used.

  Both the chemical conversion treatment and the anodizing treatment can be used for the anticorrosion treatment. That is, as one aspect of the present invention, a form in which the anticorrosion treatment is a chemical conversion treatment and a form in which an anodizing treatment is performed can be given.

  As one form of this invention, the form which comprises the coating process which gives a coating to at least one surface and produces a coating board, without winding up the said anti-corrosion processing board is mentioned. And in the said formation process, the said progressive press process is given to the said coating plate following the said coating, without winding up the said coating plate.

  According to the said form, the magnesium alloy member which provides a coating layer in addition to a corrosion prevention layer is obtained. The obtained magnesium alloy member is further improved in corrosion resistance by the coating layer, and is also excellent in decorativeness and design. And according to the said structure, by performing coating also after anti-corrosion treatment, work efficiency is further improved, and since the time from anti-corrosion treatment to painting is short, inclusions etc. are hard to be generated. The layer can be firmly adhered. In addition, since the object to be coated is a simple shape such as a plate material, the coating can be performed easily and accurately. Furthermore, by applying press processing to the coated plate, the coating layer functions as a protective layer for the anticorrosion layer, so that the anticorrosion layer can be effectively prevented from being damaged or peeled off during pressing. Here, when the press working is performed after the anticorrosion treatment as described above, the anticorrosion layer may be scratched or peeled off depending on the processing conditions. Although it is conceivable to use a lubricant as an anti-scratch, if the coating is performed with the lubricant remaining, the adhesion between the anticorrosion layer and the coating layer may be reduced. It is conceivable to remove the lubricant by performing degreasing before painting, but this degreasing may damage the anticorrosion layer. On the other hand, according to the said structure, by forming a coating layer continuously on an anticorrosion layer, a lubricant interposes between an anticorrosion layer and a coating layer, or an anticorrosion layer is removed by degreasing. There is no fear. If the above-described lubricating sheet is used in place of the lubricant, the press working can be performed stably regardless of the press working conditions, and the steps of applying and degreasing the lubricant can be omitted. In addition, both the anticorrosion layer and the coating layer can be protected by the lubricating sheet during pressing.

  As one form of this invention, the form which comprises the pre-processing process which unwinds the said rolling coil material, performs the pre-processing which adjusts the surface to the said rolled sheet, and produces a pre-processed board is mentioned. In the anticorrosion step, the anticorrosion treatment is performed on the pretreatment plate following the pretreatment without winding the pretreatment plate.

  According to the above configuration, the pretreatment such as degreasing, acid etching, desmutting and surface adjustment is continuously performed, so that the work efficiency is further improved and the material (pretreatment plate) having excellent surface properties is immediately subjected to anticorrosion treatment. And the magnesium alloy base material and the anticorrosion layer can be firmly adhered to each other. In addition, in the process from pre-treatment → anti-corrosion treatment → painting as appropriate, the material can be subjected to press work while keeping the material substantially flat without being curled up by not winding up the material. it can. Therefore, according to the said structure, it can press accurately with respect to a continuous long raw material.

  As one aspect of the present invention, at least one surface processing selected from hairline processing, diamond cut processing, shot blast processing, spin cut processing, and etching processing is given to at least one surface of the rolled plate. It is done.

  According to the said structure, the magnesium alloy member which is excellent in corrosion resistance by having high designability and a metal texture and providing a corrosion prevention layer is obtained. In particular, in this embodiment, it is preferable to select a treatment liquid capable of forming a transparent anticorrosion layer and a coating material capable of forming a transparent coating layer so as not to impair the design and metal texture.

  As one form of this invention, the form which comprises the grinding process which unwinds the said rolling coil material, performs mechanical grinding | polishing to the said rolling plate, and produces a grinding | polishing plate is mentioned. In the anticorrosion step, the anticorrosion treatment is performed on the polishing plate subsequent to the mechanical polishing without winding the polishing plate.

  Here, the chemical conversion layer is formed by a reaction between the magnesium component in the magnesium alloy and the chemical conversion treatment liquid, and the anodic oxidation layer is energized using the magnesium alloy immersed in the treatment liquid as an anode, It consists of an oxide formed by a reaction between a magnesium component in the magnesium alloy and oxygen in the treatment liquid. For this reason, in forming the chemical conversion layer and the anodized layer, the magnesium alloy base material needs to be exposed on the material surface. That is, before the anticorrosion treatment, pretreatment such as degreasing and acid etching is performed to remove the oxide film formed on the surface of the material and the lubricant used during rolling to expose the base material. It is necessary to generate a new surface. According to the above configuration, a new surface of the magnesium alloy is generated by mechanical polishing instead of the pretreatment such as degreasing, so that the number of processes and the process time are shortened compared to the case where the pretreatment is performed. The line length can be shortened and the productivity is further improved. Mechanical polishing, in particular with wet belt polishing, can effectively prevent the scattering of grinding powder generated during grinding, and it is continuous and easy even if the material plate is long or wide. Work efficiency is good because it can be ground. In addition, this configuration also has the same precision as the pretreatment described above, because the material is not wound up in the process from mechanical polishing → anticorrosion treatment → coating as appropriate, and the material is maintained in a substantially flat state. It can be pressed well.

  As a form comprising the grinding step, at least one selected from hairline processing, diamond cut processing, shot blast processing, and spin cut processing on at least one surface of the polishing plate between the grinding step and the anticorrosion step The form which comprises the processing process which performs surface processing of this is mentioned.

  Any of the above surface treatments can form a new surface. Therefore, according to the said form, an anticorrosion layer can be favorably formed in the next anticorrosion process, without impairing the new surface formed by the grinding process, or forming a new new surface. Therefore, according to the said form, the magnesium alloy member which is excellent in corrosion resistance by providing the anticorrosion layer with the high designability and metal texture is obtained. Also in this form, it is preferable to form a transparent anticorrosion layer or a transparent coating layer so as not to impair the design and metal texture.

  The production method of the present invention is expected to be applicable to magnesium alloys (remainder Mg and impurities) containing various elements as additive elements. In particular, alloys with high concentrations of additive elements, specifically magnesium alloys with a total content of 7.3% by mass or more, depend on the type of additive elements, but mechanical properties such as strength and hardness, corrosion resistance, and flame resistance Excellent in various properties such as heat resistance. Therefore, according to the production method of the present invention, a magnesium alloy member made of magnesium alloys having various compositions and excellent in the above characteristics can be produced.

  Specific additive elements are selected from Al, Zn, Mn, Si, Be, Ca, Sr, Y, Cu, Ag, Sn, Li, Zr, Ce, Ni, Au, and rare earth elements (excluding Y and Ce) And at least one element. Examples of the impurity include Fe.

  In particular, Mg-Al alloys containing Al are excellent in corrosion resistance and mechanical properties such as strength and plastic deformation resistance. The above effect tends to be higher as the Al content is higher, 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, if the Al content exceeds 12% by mass, the plastic workability is lowered, so the upper limit is preferably 12% by mass, and more preferably 11% by mass. The total content of each element other than Al is 0.01% by mass or more and 10% by mass or less, preferably 0.1% by mass or more and 5% by mass or less.

  More specific compositions of Mg-Al alloys include, for example, AZ alloys (Mg-Al-Zn alloys, Zn: 0.2% to 1.5% by mass), AM alloys (Mg-Al-Mn) according to ASTM standards. Alloy, Mn: 0.15 mass% to 0.5 mass%), AS alloy (Mg-Al-Si alloy, Si: 0.01 mass% to 20 mass%), Mg-Al-RE (rare earth element) alloy, AX Alloy (Mg—Al—Ca alloy, Ca: 0.2 mass% to 6.0 mass%), AJ alloy (Mg—Al—Sr alloy, Sr: 0.2 mass% to 7.0 mass%), and the like.

  As one form of this invention, the form in which the said magnesium alloy contains Al 8.3 mass% or more and 9.5 mass% or less is mentioned.

  The form containing Al in the range of 7.3% by mass to 12% by mass, particularly the form containing Al in the range of 8.3% by mass to 9.5% by mass is excellent in strength and corrosion resistance. Examples of the alloy containing 8.3 mass% to 9.5 mass% of Al further include an Mg—Al—Zn alloy containing 0.5 mass% to 1.5 mass% of Zn, typically AZ91 alloy.

  In addition, it contains at least one element selected from Y, Ce, Ca, and rare earth elements (excluding Y and Ce) in a total amount of 0.001% by mass or more, preferably a total of 0.1% by mass or more and 5% by mass or less, and the balance A magnesium alloy composed of Mg and impurities is excellent in heat resistance and flame retardancy. When the rare earth element is contained, the total content is preferably 0.1% by mass or more, and particularly when Y is contained, the content is preferably 0.5% by mass or more.

  The method for producing a magnesium alloy member of the present invention can produce a magnesium alloy member having an anticorrosion layer with high productivity.

FIG. 1 is a schematic process diagram illustrating a method for manufacturing a magnesium alloy member according to Embodiment 1. FIG. 2 is a schematic perspective view showing an example of a magnesium alloy member. FIG. 3 is a schematic process diagram illustrating a method for manufacturing a magnesium alloy member according to Embodiment 2, and shows only a forming process. FIG. 4 is a graph showing the relationship between the bending radius R2 and the drawing depth D when the magnesium alloy plate is pressed so as to form a rectangular box-shaped body. FIG. 5 is a schematic process diagram illustrating a method for manufacturing a magnesium alloy member according to Embodiment 3, and shows only a grinding process and an anticorrosion process. FIG. 6 is a schematic process diagram illustrating a method for manufacturing a magnesium alloy member according to Embodiment 4, and shows a corrosion prevention process.

[Embodiment 1]
Hereinafter, a method for manufacturing a magnesium alloy member according to Embodiment 1 will be described with reference to FIG. This manufacturing method relates to a method of manufacturing a magnesium alloy member 10 that includes a chemical conversion layer as an anticorrosion layer and is pressed. This manufacturing method prepares a rolled coil material on which a long rolled plate made of a magnesium alloy is wound as a material, runs a material plate 100 (rolled plate) on which the rolled coil material is rewound, and performs the following: It moves to each process continuously. Specifically, the material plate 100 is transported to the chemical conversion treatment mechanism 30 and subjected to anticorrosion treatment (chemical conversion treatment) to produce an anticorrosive treatment plate (chemical conversion treatment plate 104), and this chemical conversion treatment plate 104 is conveyed to the press mechanism 40. Then, progressive press working is performed to produce the magnesium alloy member 10. And this manufacturing method is characterized in that progressive press working is performed subsequent to the anticorrosion treatment without winding up the chemical conversion treatment plate 104. Further, in the manufacturing method of the first embodiment, the material plate 100 is introduced into the pretreatment mechanism 20 before the anticorrosion treatment to perform the pretreatment, and the anticorrosion treatment is performed following the pretreatment. Hereinafter, the material plate 100 will be described first, and then each process will be described in more detail.

(Material board)
The rolled coil material used for the material plate 100 is obtained as follows, for example. A long magnesium alloy cast plate is produced and wound by a continuous casting method such as a twin-roll continuous casting method, the wound cast coil material is rewound, and the cast plate is rolled for at least one pass (typically warm). A long rolled sheet is produced by winding the rolled sheet.

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

  The thickness, width, and length of the cast plate can be appropriately selected. For example, when the thickness is 10 mm or less, further 7 mm or less, particularly 5 mm or less, segregation or the like hardly occurs and the strength is excellent. In addition, if a long cast plate having a length of 30 m or more, further 50 m or more, especially 100 m or more, or a wide cast plate having a width of 100 mm or more, 200 mm or more, especially 250 mm or more is used as the material of the rolled plate, the long plate The rolled coil material obtained by winding the rolled plate can be suitably used as a material for a plastically processed member (secondary processed material) such as a pressed member. In addition, when the inner diameter of the cast coil material is small, it is preferable to wind the cast plate in a state of being heated to 150 ° C. or more immediately before winding the cast plate because it can be wound without causing cracks. In addition, if both edges (both sides in the width direction) of the cast plate are trimmed before rolling, even if cracks have occurred on both edges of the cast plate, the cracks will progress during rolling. Can be prevented. Trimming may also be applied to the rolled plate.

  The rolling preferably includes warm rolling performed by heating the material including the cast plate to 150 ° C. or more and 400 ° C. or less. By heating the material in the above temperature range, the plastic workability of the material can be improved, and even if the rolling reduction per pass is increased to, for example, about 10% to 50%, cracks are hardly generated. Moreover, by setting it as the said temperature range, suppression of the deterioration by the seizure etc. of the raw material surface and suppression of the thermal deterioration of a rolling roll can be aimed at. 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. Rolling can be performed by heating not only the raw material but also the rolling roll, utilizing the controlled rolling disclosed in JP 2007-098470 A, and other known conditions. The cast plate may be subjected to solution treatment (for example, heating temperature: 350 ° C. to 420 ° C., holding time: 1 hour to 40 hours) and then rolled.

  The rolling including the warm rolling may be performed in one pass or multiple passes. By rolling a plurality of passes, a thin rolled sheet can be obtained, and the average crystal grain size of the structure constituting the rolled sheet can be reduced (for example, 10 μm or less, preferably 5 μm or less), or press working. It is possible to improve the plastic workability. The number of passes, the reduction rate of each pass, and the total reduction rate can be appropriately selected so that a rolled sheet having a desired thickness can be obtained.

  When performing multi-pass rolling, an intermediate heat treatment is performed between the passes, and the strain, residual stress, texture, etc. introduced into the material by the plastic working (mainly rolling) up to the intermediate heat treatment are removed and reduced. Rolling can be performed more smoothly by preventing inadvertent cracking, distortion and deformation during rolling. Examples of the intermediate heat treatment include heating temperature: 150 ° C. to 350 ° C., holding time: 0.5 hour to 3 hours.

  The thickness, width, and length of the rolled plate can be appropriately selected. In particular, the thickness of the rolled plate is preferably 0.1 mm or more and 2.0 mm or less because of excellent press workability, and 0.3 mm to 1.2 mm is easy to use. Further, by using a long material having a length of 50 m or more, further 100 m or more, particularly 200 m or more, a press-worked member can be continuously produced. Furthermore, by using a wide material having a width of 100 mm or more, further 200 mm or more, particularly 250 mm or more, a large press-worked member can be continuously produced. Therefore, such a long material or a rolled coil material obtained by winding a wider material can be suitably used for mass production of the pressed member.

  In the above rolling, if a lubricant is appropriately used, the frictional resistance at the time of rolling can be reduced, and the material can be prevented from being seized and rolled easily.

  After the rolling, a coil material obtained by winding the rolled plate after correction can be used for the material plate 100. This straightening treatment is particularly preferably carried out by heating the rolled plate to 100 to 300 ° C, preferably 150 to 280 ° C. The straightening treatment is, for example, a heating furnace capable of heating the rolled plate, and a roll in which a plurality of rolls are arranged in a staggered manner facing each other in order to continuously bend (strain) the heated rolled plate. A roll leveler device comprising a portion can be suitably used. The straightened plate subjected to such warm correction is dynamically recrystallized during plastic processing such as press processing, and is excellent in plastic workability.

  If the anticorrosive layer is provided on only one of the front and back surfaces of the material plate 100, masking is appropriately applied to the surface where the anticorrosion layer is not required so that the pretreatment liquid and the anticorrosion treatment liquid do not come into contact with each other. can do.

  In addition, after the rolling or straightening treatment, at least one surface processing selected from hairline processing, diamond cut processing, shot blast processing, spin cut processing, and etching processing is performed on at least one of the front and back surfaces of the material plate. Can do. That is, as the material plate 100, one having the above surface processing can be used. By using such a material plate, a magnesium alloy member having a high metal texture and excellent design can be obtained.

(Feeding drum / winding drum)
The rolled coil material is arranged on the feeding drum 50 and feeds the material plate 100. Here, the magnesium alloy member 10 that is finally obtained from the chemical conversion treatment plate 104 that has been subjected to an appropriate treatment on the material plate 100 is left after being punched (by removing the magnesium alloy member 10, a plurality of windows are provided. The belt-shaped material (scrap 105) in a state is wound up by a winding drum (not shown). The feed drum 50 and the take-up drum are rotated by a power source such as a motor, whereby the material plate 100 to the chemical conversion treatment plate 104 to the scrap 105 travel between the two drums. This traveling speed becomes the conveyance speed (line speed) of the material plate 100 (= pretreatment plate (described later) = chemical conversion treatment plate 104 = scrap 105). The scrap 105 may not be wound up. In this case, the material plate 100 (= pretreatment plate (described later) = chemical conversion treatment plate 104 = scrap 105) is caused to travel by arranging a delivery roller or the like for encouraging the conveyance of the material plate 100 or the like at an appropriate position in the line. Can do. Further, the scrap 105 may constitute a molding die to be described later so as to be appropriately cut after the magnesium alloy member 10 is punched or simultaneously with the punching. If it is set as the structure wound up like this example, it can convey by pushing the magnesium alloy member 10 with the window part formed in the scrap 105. FIG.

(Pretreatment mechanism)
The material plate 100 rewound from the feeding drum 50 is transferred to the pretreatment mechanism 20. The pretreatment mechanism 20 includes a degreasing tank 21 that degreases the raw material plate 100, a first surface adjustment tank 22 that performs acid etching as a first surface adjustment on the degreased degreased plate 101, and surface-adjusted etching. The plate 102 is provided with a second surface conditioning tank 23 that performs desmutting and surface conditioning as second surface conditioning. The surface adjustment plate 103 that has passed through the second surface adjustment tank 23 becomes the final pretreatment plate introduced into the chemical conversion mechanism 30. Each of the above processes is sequentially performed without winding any of the plates 100, 101, and 102.

  Each tank: The degreasing tank 21, the first surface conditioning tank 22, and the second surface conditioning tank 23 are appropriately filled with the processing liquid used for each of the above treatments, and each traveling plate: the material plate 100, the degreasing plate 101, the etching The plate 102 is immersed. Each of the tanks 21, 22, and 23 has a size capable of storing a necessary amount of liquid so that the plates 100, 101, and 102 are sufficiently in contact with the respective processing liquids and the predetermined processing is sufficiently performed. This size can be appropriately selected in consideration of parameters relating to the immersion time, such as the length of immersion of each plate 100, 101, 102, the conveyance speed, and the type of treatment liquid. For example, when the immersion length is increased, that is, when the length of each plate 100, 101, 102 in each tank 21, 22, 23 is increased in the traveling direction, a sufficient immersion time is ensured even if the conveyance speed is increased. it can. Or when shortening immersion length, ie, shortening the said length in each tank 21,22,23, predetermined | prescribed immersion time is fully securable by making conveyance speed comparatively slow. Alternatively, a predetermined immersion time may be ensured by adjusting the conveying speed and the tension applied to each plate 100, 101, 102 so that each plate 100, 101, 102 bends within each tank 21, 22, 23. In order to bend each of the plates 100, 101, 102, for example, a pinch roll (not shown) may be disposed on at least one of the front and rear sides of each of the tanks 21, 22, 23 to sandwich the plates 100, 101, 102. By pinching each plate 100, 101, 102 with a pinch roll, it is difficult for the tension by the feeding drum 50, the take-up drum, the press mechanism 40, etc. to be applied to the region where each plate 100, 101, 102 is introduced into each tank 21, 22, 23 ( Alternatively, the plates 100, 101, 102 can be bent by a desired amount.

  Each tank 21, 22, 23 can be provided with a liquid stirring means such as an ultrasonic stirring device, or a heating means such as a heater and a control means therefor. By providing liquid stirring means, each plate: material plate 100, degreasing plate 101, and etching plate 102 can be in uniform contact with each processing liquid, and by providing heating means, each processing liquid can be easily brought to a predetermined temperature. Can be retained. This also applies to the chemical conversion treatment mechanism 30 described later.

  In the example shown in FIG. 1, cleaning nozzles 25, 26, and 27 that discharge cleaning liquid for cleaning each processing liquid are disposed downstream of the tanks 21, 22, and 23. By providing a cleaning process, the processing liquid of the previous process is unlikely to remain on each plate: degreasing plate 101, etching plate 102, and surface adjustment plate 103, and each plate 101, 102, 103 is excessive in the processing liquid. Can be prevented from touching. The cleaning nozzles 25, 26, and 27 are provided in pairs, and are arranged to face each other with the plates 101, 102, and 103 interposed therebetween. For example, water can be used as the cleaning liquid (this also applies to the cleaning liquid after the anticorrosion treatment described later). The temperature of the cleaning liquid can also be appropriately selected. It can also be set as the form which applies the washing | cleaning liquid from which temperature differs with respect to one process.

(Chemical conversion processing mechanism)
Final pretreatment plate: The surface adjustment plate 103 is also transferred to the chemical conversion treatment mechanism 30 without being wound. The chemical conversion treatment mechanism 30 is filled with a chemical conversion treatment liquid, and a treatment tank 31 in which the traveling surface adjustment plate 103 is immersed in the chemical conversion treatment liquid, and a drying means 32 for drying the chemical conversion treatment plate 104 drawn from the treatment tank 31. With.

  The treatment tank 31 has a size capable of storing the amount of liquid necessary for the pretreatment plate (surface adjustment plate 103) to be in sufficient contact with the chemical conversion treatment liquid to form a chemical conversion layer having a desired thickness. . Similar to the pretreatment step described above, this size can be appropriately selected in consideration of parameters relating to the immersion time such as the length of immersion of the pretreatment plate, the conveyance speed, and the type of chemical conversion treatment liquid. As described above, depending on the immersion time, the immersion length and the conveyance speed can be adjusted, or the pretreatment plate can be appropriately bent.

  The chemical conversion treatment liquid is typically a P (phosphorus) liquid, P-Mn (phosphorus-manganese) liquid, or Cr (chromium) liquid, and a known chemical conversion liquid can be used. In particular, the P-based liquid does not substantially contain Cr or Mn and is easy to use from the viewpoint of environmental conservation. In the case of using a P-based liquid, the chemical conversion layer is mainly composed of a phosphate, for example. When using a material plate 100 that has been subjected to surface processing such as hairline processing as described above, the metal texture is excellent when the treatment liquid is selected so that a transparent (colored or colorless) chemical conversion layer is formed. A magnesium alloy member is preferably obtained.

  In addition, the chemical conversion treatment mechanism 30, as in the pretreatment step, is a cleaning means for cleaning the chemical conversion treatment liquid downstream of the treatment tank 31, for example, a cleaning nozzle or a cleaning liquid tank (not shown) for storing the cleaning liquid. It can be set as the form which arranged. By this form, the chemical conversion liquid adhering to the process target can be removed.

  The drying means 32 is for drying the cleaning liquid and the like adhering to the chemical conversion treatment plate 104. As the drying means 32, for example, a fan or an air blow nozzle that blows out air with a suitable temperature (such as warm air) can be used. Further, when a liquid absorption roll for wiping off the liquid such as the cleaning liquid is provided on the upstream side of the drying means 32, the liquid such as the chemical conversion liquid can be more reliably removed, and the surface properties resulting from the adhesion of these liquids Can be prevented. Therefore, the form including the wiping means and the drying means 32 can manufacture the chemical conversion treatment plate 104 that is superior in surface properties.

(Press mechanism)
The chemical conversion treatment plate 104 is transferred to the press mechanism 40 as it is without being wound. The press mechanism 40 is a progressive press device that forms a desired press-worked member.For example, a plastic working part that performs press work of an appropriate shape, and a magnesium alloy member (press-worked member) 10 from the chemical conversion treatment plate 104. A final punching section for finally separating the scrap 105; In FIG. 1, only the plastic working part is shown. The plastic working portion includes a molding die having an upper die 41 and a lower die 42 for molding the chemical conversion treatment plate 104, and a region for molding a press-work member in the chemical conversion treatment plate 104 at the time of molding (hereinafter referred to as a molding region). And a plurality of guide pins (not shown) for guiding the opening / closing operation (in this case, movement in the vertical direction) of the mold. At least one molding die is provided. In a general progressive press apparatus, a plurality of molding dies are provided with molding die blocks that are integrally provided in multiple stages along the material traveling direction, and the traveling material is molded little by little by each molding die. Then, a final molded body is formed. Further, the upstream molding die includes an initial punching die that performs a punching process of separating the molding region of the material and a portion other than the molding region, leaving a connection portion. As such a progressive press apparatus, an appropriate apparatus capable of performing desired molding can be used. Here, a plastic working part having at least the initial punching die and one molding die is used.

  When the press working is performed in a temperature range of 200 ° C. to 300 ° C., the plastic workability of the material is enhanced and the plastic working is easy. For example, a heating means is provided in the molding die of the plastic working part, and the chemical conversion treatment plate 104 is heated by heating the molding die, or a heating part is provided upstream of the molding die of the plastic working part. The heating unit 104 heats the chemical conversion treatment plate 104 to be sent to the molding die, or includes a heating means upstream of the press mechanism 40 to heat the chemical conversion treatment plate 104 by the heating means. Examples of the drying means 32 include using a device that blows warm air to heat the chemical conversion treatment plate 104 along with drying.

  Here, the pressed member is a box having a rectangular top plate (or bottom surface) as shown in FIG. Here, the present inventors can use a rolled plate (thickness: 0.6 mm) made of a magnesium alloy containing 8.3 mass% or more and 9.5 mass% or less of Al, and can be formed by pressing without applying a lubricant. The shape was investigated. As a result, the bending radius R1 of the corner of the top plate is preferably 10 mm or more, the bending radius R2 of the corner formed by the top plate and the side wall is preferably 5 mm or more, and the length of the side wall (drawing depth D) is preferably 3 mm or less. And gained knowledge. Therefore, here, a box having a dimension appropriately selected within a range of a bending radius R1: 10 mm or more, a bending radius R2: 5 mm or more, and a drawing depth D: 3 mm or less is formed. By not using the lubricant, the magnesium alloy member 10 after press working does not require a degreasing process or a cleaning step for removing the lubricant, and the productivity is excellent.

  In addition, a traveling guide or the like can be provided on the upstream side of the press mechanism 40 in order to improve the straightness of the chemical conversion treatment plate 104 introduced into the press mechanism 40.

  A winding drum (not shown) is provided on the downstream side of the press mechanism 40, and the scrap 105 from which the magnesium alloy member 10 has been cut is wound. The pressed member 10 existing in the window portion of the scrap 105 traveling by the winding is pushed by the window portion and sequentially conveyed to the winding drum side as described above. Therefore, the magnesium alloy member 10 can be easily recovered by providing a press member recovery location immediately before the winding drum.

[Test Example 1]
Based on the manufacturing method of the magnesium alloy member of the present invention of Embodiment 1 described above, a magnesium alloy member was produced.

  In this test, a molten magnesium alloy with a composition equivalent to AZ91 alloy (Mg-8.7% Al-0.65% Zn (all mass%)) was prepared, and a 4mm thick cast plate was continuously produced by a twin roll continuous casting machine. And wound up to produce a cast coil material. The cast coil material was charged into a batch furnace and subjected to a solution treatment at 400 ° C. for 24 hours. The obtained solid solution coil material was unwound and rolled by multiple passes under the following conditions to produce a rolled coil material having a thickness of 0.6 mm, a width of 250 mm, and a length of 800 m. Here, the rolled coil material obtained was further rewound, charged into a roll leveler device and subjected to warm correction (plate temperature: 150 ° C. to 280 ° C.), and then a wound correction coil material was prepared. .

[Rolling conditions]
Rolling rate: 5% / pass to 40% / pass Material heating temperature: 250 ° C to 280 ° C
Roll temperature: 100 ℃ ~ 250 ℃

  The rolled coil material (corrected coil material) subjected to the above warm correction is placed on the feeding drum 50 and rewound, and pretreatment (degreasing, acidifying) is performed on the material plate 100 (here, the rolled plate subjected to warm correction). Etching, desmutting, and surface adjustment) were sequentially performed. Here, commercially available products (chemical solutions manufactured by Million Chemical Co., Ltd.) were prepared for all of the degreasing solution, the etching solution, the desmutting and the surface conditioning solution. Then, depending on the chemical solution used, the immersion time of the degreasing treatment liquid of the material plate 100, the immersion time of the acid etching solution of the degreasing plate 101, the desmutting of the etching plate 102 and the immersion time of the surface adjustment solution are set, and the setting The size and transport speed of the degreasing tank 21, the first surface adjustment tank 22, and the second surface adjustment tank 23 were adjusted so that time would be reached. Further, after each treatment, the distance between the tanks and the conveyance speed were adjusted so that running water washing (room temperature) from the washing nozzles 25, 26, and 27 was appropriately performed.

  The obtained pretreatment plate (surface adjustment plate 103) was not taken up and subsequently subjected to anticorrosion treatment. Here, a commercial product (chemical conversion treatment chemical manufactured by Million Chemical Co., Ltd.) was used as the anticorrosion treatment solution, and a chemical conversion layer mainly composed of phosphate was formed. Further, here, the immersion time of the pretreatment plate was set according to the chemical solution used, and the size of the treatment tank 31, the conveyance speed, and the like were adjusted so as to be the set time.

  After immersing the pretreatment plate (surface adjustment plate 103) in the treatment tank 31, the chemical conversion treatment plate 104 that has passed through the treatment tank 31 is washed by running water cleaning (room temperature), and by the drying means 32, warm air (80 ° C to 100 ° C) Etc.) was sprayed to dry the cleaning solution. The obtained chemical conversion treatment plate 104 was subsequently subjected to a progressive press to produce 2000 rectangular box-shaped magnesium alloy members 10 having chemical conversion layers (bending radius R1: 12 mm, bending radius R2: 7 mm, drawing depth). : 2.5mm).

  In any of the obtained magnesium alloy members 10, the chemical conversion layer is not damaged or peeled off (visual confirmation), is in close contact with the base material of the magnesium alloy, and the base material is not cracked. (Visual confirmation), it was molded with high accuracy.

<Effect>
In the production method of the present invention, since the object to be subjected to the anticorrosion treatment is a simple shape such as a plate, even if the object is long or wide, the anticorrosion treatment (here, chemical conversion treatment) can be easily performed. . And this invention manufacturing method cuts | disconnects the process arrange | positioned to a jig | tool and a long coil material separately in performing a pre-processing, an anti-corrosion process, etc. to a press material by performing a progressive press following the said anti-corrosion process. A process etc. can be skipped and the magnesium alloy member which comprises a corrosion prevention layer (here chemical conversion layer) can be manufactured with high productivity. In addition, by not winding between the anticorrosion treatment and the progressive press, there is no curl on the material, and there is no need for a process to correct curl before press processing after the anticorrosion treatment, improving work efficiency. In addition, it is possible to perform press processing on a material excellent in straightness, and therefore press processing can be performed with high accuracy. Therefore, the obtained magnesium alloy member has an anticorrosion property by providing an anticorrosion layer, and also has excellent dimensional accuracy.

  In particular, in the manufacturing method of Embodiment 1, the adhesion between the base material of the magnesium alloy and the anticorrosion layer is excellent by adopting a configuration in which the pretreatment of the anticorrosion treatment is continuously performed. In addition, the winding work and the curl correction work in the pretreatment process are unnecessary, and from this point, the manufacturing method of Embodiment 1 can improve work efficiency.

  In addition, the above-mentioned pre-processing is sequentially performed and wound up on the material plate prepared by rewinding the rolled coil material described above, and the wound pre-processed coil material is rewound, and the anticorrosion treatment and progressive feeding as described above. Pressing can be performed sequentially. In this embodiment, the line length can be shortened by not making the pretreatment, the anticorrosion treatment, and the progressive press the same line.

[Embodiment 2]
Hereinafter, a method for manufacturing a magnesium alloy member according to Embodiment 2 will be described with reference to FIG. This manufacturing method is basically the same as the manufacturing method of the first embodiment, and appropriately performs pretreatment, anticorrosion treatment, and progressive press successively on a material plate obtained by rewinding a rolled coil material made of a magnesium alloy. The present invention relates to a method for producing a magnesium alloy member having a corrosion prevention layer and subjected to press working. The manufacturing method of the second embodiment is different in that the lubricating sheets 61 and 62 are arranged on both surfaces of the chemical conversion treatment plate 104 when the anticorrosion treatment plate (here, chemical conversion treatment plate 104) introduced into the press mechanism 40 is pressed. . Hereinafter, this difference will be described in detail, and a detailed description of the configuration and effects that are the same as those in the first embodiment will be omitted.

  The lubrication sheets 61 and 62 are belt-like materials arranged for the purpose of improving moldability, preventing material seizure, and preventing damage to the chemical conversion layer when the chemical conversion treatment plate 104 is pressed. As the lubricating sheets 61 and 62, those made of a fluororesin such as polytetrafluoroethylene and made of a material excellent in lubricity can be suitably used. Such a lubricating sheet can be suitably used for relatively strong processing such as a bending radius R1: less than 10 mm, a bending radius R2: less than 5 mm, and a drawing depth D: more than 3 mm. Here, when the inventors investigated using a lubricating sheet made of polytetrafluoroethylene (thickness: 50 μm), as in Embodiment 1, in the rolled plate having a thickness t: 0.6 mm, the bending radius R1: Up to 2 mm, bending radius R2: up to 0.9 mm, and drawing depth D could be pressed into the hatched area shown in FIG. FIG. 4 shows the relationship between the bending radius R2 and the drawing depth D in the rectangular box shown in FIG. 2, and the hatched area shows an area where pressing can be performed without causing cracks. The smaller the bending radius R2, the stronger the processing. As shown in FIG. 4, it can be seen that the drawing depth D can be increased as the bending radius R2 is increased. In particular, when pressing twice (when using the above-described two-stage molding die as a progressive press device), it was possible to press the bending radius R2: 0.2 mm. Therefore, when forming a press-worked member having such a small bending radius or a large drawing depth, a lubricating sheet can be suitably used.

  The thickness of the lubricating sheets 61 and 62 is easily about 20 μm to 100 μm. If it is too thin as less than 20 μm, there is a risk of breaking during press processing, and if it is too thick as over 100 μm, it is necessary to increase the gap between the molding die and the chemical conversion treatment plate 104, and the dimensional accuracy of the pressed member There is a risk of lowering. It is preferable that the widths of the lubricating sheets 61 and 62 be equal to or greater than the width of the chemical conversion treatment plate 104 because the molding region of the chemical conversion treatment plate 104 can be sufficiently covered. As the lubricating sheets 61 and 62, those having a size that can cover at least the molding region of the chemical conversion treatment plate 104 are used.

  The lubricating sheets 61 and 62 are wound around the feeding bobbins 65 and 66, respectively, and the lubricating bobbins 65 and 66 are rewound to feed the lubricating sheets 61 and 62 and cover the molding region of the chemical conversion treatment plate 104. . In addition, when the pressed member is punched from the forming region of the chemical conversion treatment plate 104, the portion covering the above-mentioned forming region in the lubricating sheets 61 and 62 is simultaneously punched, and the rest (similar to the scrap 105, a plurality of window portions are provided. A configuration in which the belt-like material in the formed state (hereinafter referred to as the remaining portion) is wound up by the winding bobbins 67 and 68 is mentioned. By feeding the feeding bobbins 65 and 66 and winding the winding bobbins 67 and 68, the lubricating sheets 61 and 62 can travel between the feeding bobbins 65 and 66 and the winding bobbins 67 and 68, and the lubricating sheet 61 , 62 can be effectively prevented from remaining in the molding die or being caught during pressing.

  In the manufacturing method of the second embodiment, the feeding bobbins 65 and 66 may be disposed on the upstream side of the press mechanism 40, and the winding bobbins 67 and 68 may be disposed on the downstream side of the pressing mechanism 40.

  According to the above configuration, a magnesium alloy member having a small bending radius and a magnesium alloy member having a large drawing depth can be accurately formed without using a lubricant. Further, according to the above configuration, the step of removing the lubricant is not required as in the case where the lubricant is used, and the anticorrosion layer (here, a chemical conversion layer, including an anodic oxide layer described later) is used when the lubricant is removed. In addition, the paint layer described later is not damaged. Furthermore, according to the said structure, since a corrosion prevention layer and the coating layer mentioned later can be protected at the time of press processing with a lubrication sheet, it can prevent effectively that a corrosion protection layer and a coating layer are damaged at the time of press processing.

[Test Example 2]
Based on the production method of the magnesium alloy member of the present invention of Embodiment 2 described above, a magnesium alloy member was produced.

  In this test, each of the rolled coil materials prepared in Test Example 1 (Mg-8.7% Al-0.65% Zn (all mass%), thickness 0.6 mm, width 250 mm, length 800 m) up to the anticorrosion treatment process. The process was performed in the same manner as in Test Example 1 to produce a similar anticorrosion treatment plate (here, a chemical conversion treatment plate). In order to progressively press this chemical conversion treatment plate, a polytetrafluoroethylene sheet (thickness: 50 μm, width: 250 mm) is prepared as a lubrication sheet, and the press is performed with a pair of lubrication sheets sandwiching the front and back of the chemical conversion treatment plate. It was set as the structure which processes. The rotational speeds of the feeding bobbin and the take-up bobbin were adjusted so that the lubricating sheet was supplied at a speed corresponding to the conveyance speed of the chemical conversion treatment plate. The pressing conditions were bending radius R1: 2 mm, bending radius R2: 0.9 mm, drawing depth: 5 mm, and stronger processing than in Test Example 1 was performed.

  As a result, 2000 rectangular box-shaped magnesium alloy members were produced, but none of the magnesium alloy members were damaged or peeled off (visual confirmation) and adhered to the base material of the magnesium alloy. In addition, the base material was not cracked (visual confirmation) and was molded with high accuracy.

[Embodiment 3]
Hereinafter, a method for manufacturing a magnesium alloy member according to Embodiment 3 will be described with reference to FIG. This manufacturing method is similar to the manufacturing method of the first embodiment, the material plate obtained by rewinding the rolled coil material made of a magnesium alloy is subjected to an anticorrosion treatment (here, a chemical conversion treatment plate) and a progressive press continuously, and the anticorrosion layer. The present invention relates to a method for manufacturing a magnesium alloy member that includes (in this case a chemical conversion layer) and is subjected to press working. The manufacturing method of Embodiment 3 is different in that mechanical polishing is performed on the material plate 100 instead of pretreatment such as degreasing, acid etching, desmutting, and surface adjustment. Hereinafter, this difference will be described in detail, and a detailed description of the configuration and effects that are the same as those in the first embodiment will be omitted.

  In the manufacturing method of the third embodiment, the material plate 100 unwound from the feeding drum 50 is mechanically polished by the grinding mechanism 70 to produce the polishing plate 110, and the polishing plate 110 is not wound up without winding up the polishing plate 110. Is introduced into the chemical conversion mechanism 30. Each process after the chemical conversion treatment process is the same as in the first and second embodiments.

(Grinding mechanism)
The grinding mechanism 70 is configured to perform wet belt polishing as mechanical polishing. Here, the grinding mechanism 70 includes a pair of grinding belts 71 arranged to face each other to grind the front and back surfaces of the material plate 100, and a contact roll 72 and an idle roll 73 around which each grinding belt 71 is stretched.

  The grinding belt 71 is an endless track having abrasive grains of an appropriate grain size. The particle size (mesh size) can be appropriately selected. The larger the particle size, the more smooth the surface can be produced. For example, # 320 or more, further # 400 or more, particularly # 600 or more can be suitably used as the particle size.

  The example shown in FIG. 5 shows an example in which a plurality of pairs (here, two sets) of a pair of grinding belts 71 arranged so as to sandwich the front and back of the material plate 100 are disposed along the traveling direction of the material plate 100. When a plurality of sets of grinding belts 71 are arranged in this way, the grinding belt 71 on the upstream side in the running direction (left side in FIG. 5) uses a coarse abrasive grain (one with a small grain size), and the downstream side in the running direction (see FIG. If the grinding belt 71 on the right side (5) has fine abrasive grains (large grain size), it is easy to generate a new surface by sufficiently removing oxide film, lubricant, and surface defects, and the polishing plate 110 The surface can be smoothed. By removing the oxide film, lubricant, surface defects and the like on the surface of the polishing plate 110, it is easy to form the anticorrosion layer with uniform thickness in the next step.

  As the rotation direction of the grinding belt 71, any of the same direction (down cut) as the travel direction of the material plate 100 and the reverse direction (up cut) of the travel direction can be used. When reducing the surface roughness, down-cutting is preferable, and when increasing the amount of grinding, up-cutting with high grinding efficiency is preferable. The example shown in FIG. 5 shows the case of down cut.

  The grinding mechanism 70 includes a spray nozzle (not shown) for injecting a grinding liquid onto the grinding belt 71, the material plate 100, and the like, and is configured to perform wet grinding during grinding. As the grinding fluid, an appropriate one that hardly reacts with the magnesium alloy can be used.

  The grinding belt 71 rotates when the contact roll 72 is a main roll that rotates with a power source such as a motor, the idle roll 73 is a driven roll, and the contact roll 72 rotates. In addition, the two contact rolls 72 that are opposed to each other with the material plate 100 interposed therebetween rotate in synchronization.

  The front and back of the material plate 100 are ground by a rotating grinding belt 71, respectively. Each grinding belt 71 arranged to be opposed is configured to be movable in the thickness direction (vertical direction in FIG. 5) of the material plate 100, and by moving the contact roll 72 so as to approach and separate from the material plate 100, The amount of grinding can be increased or decreased. The amount of grinding can be appropriately selected according to the particle size, rotation speed, and the like.

  The grinding mechanism 70 shown in FIG. The cleaning nozzle 75 is disposed on the downstream side (right side in FIG. 5) of the grinding belt 71 and discharges the cleaning liquid for cleaning the grinding powder and the grinding liquid. With this cleaning liquid, it is possible to wash away grinding powder and grinding liquid adhering to the surface of the traveling polishing plate 110. By providing a cleaning step between the grinding step and the anticorrosion treatment step so that no grinding powder or grinding liquid remains on the polishing plate 110, the anticorrosion layer can be accurately formed in the next step.

  Here, after the polishing plate 110 is cleaned, the cleaning liquid is not actively dried, and the process proceeds to the next step while the cleaning liquid remains attached to the polishing plate 110. In the production method of the present invention, by continuously performing each step, the time for which the cleaning liquid has adhered can be made very short (for example, within 1 minute), and the state in which the cleaning liquid has adhered as described above. Even if it moves to the anticorrosion treatment process, there is substantially no problem. In addition, by using pure water as the cleaning liquid, it is possible to reduce problems caused by mixing the cleaning liquid with the anticorrosion treatment liquid. In addition, it can be used substantially without problems by managing the concentration of the treatment liquid and replacing it appropriately.

  According to the above configuration, the anticorrosion treatment is performed on the polishing plate 110 immediately after the grinding step without taking time, thereby suppressing the formation of an oxide film on the surface of the polishing plate and forming the anticorrosion layer. Thus, by providing a grinding step instead of the pretreatment step in the manufacturing method of Embodiment 1, the line length can be shortened and the working time can be shortened. The manufacturing method of Embodiment 3 includes an anticorrosion layer. Can be manufactured with high productivity. Further, by reducing the number of steps, facilities necessary for each step can be eliminated, and the manufacturing method of Embodiment 3 can contribute to a reduction in manufacturing cost.

As modifications of the third embodiment, the following configurations can be given.
In Embodiment 3 described above, a mode in which a plurality of sets of grinding belts are provided and grinding is performed in multiple stages along the traveling direction has been described, but a mode in which only one set of grinding belts is provided may be employed. In this case, it is preferable to use a material having a small particle size (coarse particles) because the oxide film and the lubricant can be sufficiently removed and a new surface can be reliably generated.

  In Embodiment 3 described above, the form in which both the front and back surfaces of the material plate 100 are ground and the anticorrosion layer is formed on both surfaces of the polishing plate 110 has been described, but the anticorrosion layer is formed only on one of the front and back surfaces. It can be set as a form to do. In this case, one of the pair of facing grinding belts 71 may be changed to a billy roll so that one surface of the material plate 100 is not ground. Further, in this embodiment, before rolling after rolling, or when performing the above-described correction processing after rolling, before winding after the correction processing, masking is appropriately performed on the surface that does not require the formation of the anticorrosion layer, and anticorrosion processing is performed. The liquid can be kept out of contact.

  In Embodiment 3 described above, a mode has been described in which the rolled coil material or the straightened coil material is rewound and the process proceeds to the process after grinding. However, the rolling process or the straightened process can be continuously shifted to the grinding process. . More specifically, for example, a case where rolling is performed only in one pass, or a form in which grinding is continuously performed from finish rolling to grinding, and from finishing rolling to straightening.

  In Embodiment 3 described above, the anti-corrosion treatment is continuously applied to the polishing plate. However, before the anti-corrosion treatment, the polishing plate can be subjected to surface processing such as hairline processing. More specifically, an appropriate surface processing means (not shown) is disposed on the downstream side of the grinding mechanism 70, and a desired region (one side or both sides) of the polishing plate 110 cleaned after grinding may be used. The surface may be subjected to an appropriate surface treatment and then subjected to anticorrosion treatment.

  Since the new surface is formed by the surface processing, and the new surface is formed by the grinding before the surface processing even when the surface processing is not performed, the portion subjected to the surface processing is immediately after the grinding. An anticorrosion layer can be satisfactorily formed by applying surface treatment and subsequently applying anticorrosion treatment after the surface treatment. Moreover, since the surface is roughened by the surface processing, it is expected to be excellent in adhesion to the anticorrosion layer. Furthermore, since the surface treatment is performed on the polishing plate, that is, the surface to be processed is flat and excellent in surface properties, the surface treatment can be performed with high accuracy. In particular, when cleaning after grinding, surface processing can be performed with higher accuracy. Therefore, the magnesium alloy member obtained by the manufacturing method of this embodiment has the above-mentioned surface treatment on one or both surfaces, so that it has excellent design properties, high metal texture, and excellent corrosion resistance.

  Depending on the type of surface processing, it may be desired to adjust the running speed and tension of the material during processing. In this case, for example, the material may be appropriately bent as described above, or a pinch roll may be disposed on at least one of the upstream side and the downstream side of the processed portion in the material. Furthermore, it is preferable that the surface treatment is performed in a wet manner because it is possible to effectively prevent powder scattering caused by cutting or the like. In addition, it is preferable to perform cleaning or drying of the cleaning liquid as appropriate after the surface processing because powder generated by cutting or the like can be sufficiently removed.

[Embodiment 4]
In the first embodiment, the case where the chemical conversion treatment is performed as the anticorrosion treatment has been described. In addition, anodizing treatment can be performed. Since the basic configuration of the manufacturing method of the fourth embodiment is the same as that of the first embodiment and the main difference is in the anticorrosion treatment method, the anticorrosion treatment method will be described in detail here.

  The fourth embodiment includes, for example, an anodizing mechanism 80 shown in FIG. 6 as the anticorrosion processing mechanism. An anodizing mechanism 80 shown in FIG. 6 is filled with an anodizing solution, and a processing tank 81 in which a traveling polishing plate 110 is immersed in this processing solution, a traveling polishing plate 110 as an anode, and a counter electrode 84 as a negative electrode. A power supply 82 that is energized, a conductor roll 83 that is connected to the power supply 82 and energizes the polishing plate 110 by contact with the polishing plate 110, a sink roll 85 that is disposed in the processing tank 81 and promotes the progress of the polishing plate 110, A cleaning liquid for cleaning the processing liquid is filled, and cleaning tanks 86 and 87 in which a material drawn from the processing tank 81 is immersed in the cleaning liquid, and a drying means 88 for drying the cleaning liquid. In this example, a ring roll 89 for removing excess processing liquid and cleaning liquid is appropriately disposed on the downstream side of each tank 81, 86, 87. Further, in this example, the sink roll 85 is also arranged in the cleaning tanks 86 and 87 to facilitate introduction of the material (anodizing treatment plate 106) into the respective tanks 86 and 87, and in each of the tanks 86 and 87. A feed roller is appropriately arranged on the downstream side of the plate so as to promote the travel of the anodizing plate 106. In this example, an example in which a plurality of cleaning tanks 86 and 87 are provided is shown, but one may be provided. The same cleaning liquid and drying means 88 as in the first embodiment can be used.

  In the traveling polishing plate 110, the portion introduced into the processing tank 81 is energized as an anode by contacting the upstream and downstream sides of the portion with the conductor roll 83, and mainly oxide can be formed on the surface thereof. That is, the anodized plate 106 can be manufactured continuously. Further, since the obtained anodized plate 106 is introduced into the cleaning tanks 86 and 87 and sufficiently cleaned, the processing liquid does not adhere excessively. The obtained anodized plate 106 is transferred to a press mechanism without being wound up, and subsequently subjected to progressive press.

[Embodiment 5]
In Embodiments 1 to 4 described above, the form in which the progressive press is applied to the anticorrosion treatment plate (chemical conversion treatment plate or anodization treatment plate) has been described. In addition, the production method of Embodiment 5 includes a configuration in which at least one surface of the anticorrosion treatment plate is coated, and the obtained coated plate is subjected to progressive press processing.

  For coating materials, those that have elongation that can follow deformations such as bending and drawing during press processing (things that do not crack during press processing) and those that have deformable flexibility such as dents are preferably used. can do. Specific examples include one or more resins selected from polyester-based, high-molecular polyester-based, epoxy-based, urethane-based, and acrylic resins. Alternatively, a fluororesin such as polytetrafluoroethylene can be used. By using these coating materials with excellent deformability, for example, a rectangular box with a suitably selected size in the range of a bending radius R1: 10 mm or more, a bending radius R2: 5 mm or more, and a drawing depth D: 3 mm or less is formed. In doing so, it can be pressed without cracking or peeling. Further, a desired one can be used regardless of whether it is transparent or opaque.

  In this embodiment, a coating mechanism is provided between the anticorrosion treatment mechanism (chemical conversion treatment mechanism or anodizing treatment mechanism) described in the above embodiments and the press mechanism. Examples of the coating method include roller coating, spray coating, and electrodeposition coating. Examples of the coating mechanism include a roller unit and a spray unit for applying a coating material, and a fixing unit for baking and drying the coating material. When electrodeposition coating is performed, for example, in the anodizing mechanism 80 described in the fourth embodiment, the processing tank 81 is an electrodeposition coating tank, so that the coating can be easily performed. For example, in the case of anion electrodeposition coating, the anticorrosion treatment plate is preferably used as an anode and the counter electrode as a negative electrode. In the electrodeposition coating, the configuration of the anodizing mechanism 80 described above can be used for the configuration other than changing the processing liquid in the processing tank 81. Then, as described in each of the above embodiments, the anticorrosion treatment plate is produced and the process proceeds to the coating mechanism, and a coating layer is formed on at least one surface of the traveling anticorrosion treatment plate. The obtained coated plate is transferred to a press mechanism without being wound up, and subsequently subjected to progressive press. In addition, it is preferable to perform cleaning or drying of the cleaning liquid as appropriate after coating, because a coated plate having better surface properties can be obtained.

  According to the said structure, the magnesium alloy member which provides a coating layer in addition to the anticorrosion layer on one surface or both surfaces can be manufactured with sufficient productivity. Further, by performing coating subsequent to the anticorrosion treatment, the adhesion between the anticorrosive layer and the coating layer is excellent. In particular, as described in the third embodiment, in the progressive press, by disposing a lubricating sheet, it is possible to protect the anticorrosion layer and the coating layer at the time of pressing and effectively prevent damage, and to obtain a desired shape. Press work can be formed with high accuracy. The magnesium alloy member obtained by the manufacturing method of Embodiment 5 is excellent in corrosion resistance as well as in design by providing a coating layer.

  The above-described embodiment can be appropriately changed without departing from the gist of the present invention, and is not limited to the above-described configuration. For example, the composition (type and content of additive element) of the magnesium alloy, the thickness / width / length of the rolled sheet as the raw material, the type of the anticorrosion treatment liquid, the press working conditions, and the like can be appropriately changed.

  The manufacturing method of the magnesium alloy member of the present invention includes a magnesium alloy member subjected to press working, for example, a component member of various electric / electronic devices such as a portable or small casing of an electric / electronic device, an automobile, It can utilize suitably for manufacture of the magnesium alloy member utilized for the structural member of transportation apparatuses, such as an aircraft.

10 Magnesium alloy parts
20 Pretreatment mechanism 21 Degreasing tank 22 First surface conditioning tank 23 Second surface conditioning tank
25,26,27 Cleaning nozzle
30 Chemical conversion mechanism 31 Treatment tank 32 Drying means
40 Press mechanism 41 Upper die 42 Lower die 43 Support part
50 Feeding drum
61,62 Lubricating sheet 65,66 Feeding bobbin 67,68 Rewinding bobbin
70 Grinding mechanism 71 Grinding belt 72 Contact roll 73 Idle roll
75 Cleaning nozzle
80 Anodizing mechanism 81 Treatment tank 82 Power supply 83 Conductor roll
84 Counter electrode 85 Sink roll 86,87 Cleaning tank 88 Drying means
89 Ring roll
100 Material plate 101 Degreasing plate 102 Etching plate 103 Surface adjustment plate
104 Chemical conversion plate 105 Scrap 106 Anodizing plate
110 Polishing plate

Claims (8)

A magnesium alloy member manufacturing method for producing a magnesium alloy member by subjecting a plate made of a magnesium alloy to press working,
A preparation step of preparing a rolled coil material in which a long rolled plate is wound;
An anticorrosion step of rewinding the rolled coil material and subjecting the rolled plate to anticorrosion treatment, and producing an anticorrosion treatment plate;
Without rolling up the anticorrosion treatment plate, following the anticorrosion treatment, the anticorrosion treatment plate is subjected to progressive press processing, and a forming step of producing a magnesium alloy member ,
The anticorrosion treatment method as a chemical conversion treatment magnesium alloy member. Wherein in the forming step, the manufacturing method of the magnesium alloy member according to the forward feed press working facilities to請 Motomeko 1 in the state in which the lubricating sheet on both surfaces of the anticorrosion treatment plate. Without winding up the anticorrosion treatment plate, the paint is applied to at least one surface thereof, and includes a painting process for producing a paint plate,
Wherein in the molding step without winding the coated plate production method of magnesium alloy member according to the facilities of the forward feed pressing the coated plate subsequent to coating to請 Motomeko 1 or claim 2. Rewinding the rolled coil material, applying a pretreatment to adjust the surface of the rolled plate, comprising a pretreatment step of producing a pretreated plate,
Wherein the anti-corrosion process, without winding the pre-treated sheet, the front facilities the anticorrosion treatment to the pre-treated sheet following the treatment be請 Motomeko 1 according magnesium according to any one of claim 3 Alloy Manufacturing method of member. On at least one surface of the rolled plate, hair line process, diamond cutting, shot blasting, spin cutting, and at least one surface treatment selected from the etching processing that has been subjected 請 Motomeko 1 according to claim 4 2. The method for producing a magnesium alloy member according to any one of the above. Rewinding the rolled coil material, subjecting the rolled plate to mechanical polishing, and comprising a grinding step of producing a polished plate,
Wherein the anti-corrosion process, without winding the polishing plate, magnesium alloy member according to any one of the mechanical facilities and the anticorrosion treatment to the polishing plate polishing subsequent to請 Motomeko 1 to claim 3 Manufacturing method. Between the grinding step and the anticorrosion step, a processing step of performing at least one surface processing selected from hairline processing, diamond cutting processing, shot blasting processing, and spin cutting processing on at least one surface of the polishing plate method of manufacturing a magnesium alloy member according to 請 Motomeko 6 that. Wherein said magnesium alloy, a manufacturing method of magnesium alloy member according to any one of 請 Motomeko 1 to claim 7 you containing Al 8.3 mass% to 9.5 mass% or less.

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