JP6483503B2 - Magnesium material for molding - Google Patents

Description

  The present invention relates to a magnesium-based member for molding.

  Magnesium and magnesium alloys are the lightest metal materials in practical use and not only excel in specific strength, dent resistance and vibration absorption, but also have an electromagnetic shielding effect. Widely used in automobile parts.

  Products made of magnesium and magnesium alloys are usually obtained by rolling a casting material by rolling, pressing, etc., but the casting material has segregation and coarse crystal grains, so cracks occur during the molding process. Cheap. In addition, since the crystal structure is a hexagonal close packed structure, a texture in which the bottom surface is arranged in parallel to the rolling surface is easily formed by rolling or the like, and once the texture is formed, the deformation in the thickness direction is It is very difficult.

  As a technique for improving the formability of a magnesium alloy, it has been disclosed that press workability and the like can be improved by blending a rare earth element or strontium with a magnesium alloy (see, for example, Patent Document 1 or 2).

  Further, as a technique for improving the formability by refining crystal grains, a method of forming a magnesium alloy sheet by repeating cold rolling and heat treatment of a magnesium alloy sheet (for example, see Patent Document 3) was cast. After the solution treatment of the magnesium alloy, it is forged so that the crystal grain size of the aluminum alloy is 10 μm or less and further formed into a desired shape by forging (see, for example, Patent Document 4), the magnesium alloy before being inserted into the rolling roll A method of manufacturing a magnesium alloy sheet while controlling the temperature and the surface temperature of the rolling roll to a predetermined temperature (for example, see Patent Document 5) is disclosed.

  Further, as a technique for improving the formability by inclining the crystal orientation, a magnesium alloy member for forming obtained by performing different peripheral speed rolling of a magnesium alloy at a high temperature (for example, Patent Documents 6 to 8) and the like. It is disclosed.

  On the other hand, a magnesium-based clad material having a metal layer made of magnesium or a magnesium alloy and having excellent press moldability and corrosion resistance has been proposed (Patent Document 9 or 10).

Japanese Patent Laid-Open No. 06-293944 Japanese Patent Laid-Open No. 07-188826 JP 2001-294966 A JP 2003-268513 A Japanese Patent Laid-Open No. 2004-60048 JP 2010-202898 A JP 2011-58054 A JP 2014-43601 A JP 2006-88435 A JP 2010-155357 A

  However, in Patent Documents 1 and 2, although the moldability is improved, the raw material cost is increased, and there is a possibility of causing a problem in recycling. On the other hand, in the techniques of Patent Documents 3 to 8, solution treatment is required before or after rolling, or rolling at 400 ° C. or higher is required, the process becomes complicated, the apparatus becomes very large, and the cost increases. . Furthermore, in the techniques described in Patent Documents 9 and 10, when clad layers are provided on both sides of a metal layer made of magnesium or a magnesium alloy, it is not possible to apply much shear deformation to the magnesium layer, which is similar to ordinary rolling and pressing. However, there is a problem that the rolling reduction and the machining allowance cannot be made large.

  The present invention has been made in view of the above, and an object of the present invention is to provide a magnesium-based member for forming suitable for forming because there is little segregation or deviation in crystal orientation and the crystal grains are fine. .

  In order to solve the above-described problems and achieve the object, a magnesium-based member for forming according to the present invention includes a base material made of a metal or an alloy, and a powder made of magnesium or a magnesium alloy on the surface of the base material. A thin film formed by accelerating with gas and spraying and depositing in a solid state is provided.

  Further, in the above invention, the magnesium-based member for molding according to the present invention is the same metal or alloy as the substrate or a metal different from the substrate 2 on the surface of the thin film opposite to the surface in contact with the substrate. Alternatively, a film formed by accelerating a material powder made of an alloy together with a gas and spraying and depositing the powder on the surface of the thin film in a solid state is provided.

  In the above invention, the magnesium-based member for molding according to the present invention is characterized in that the base material is removed after the formation of the thin film.

  The magnesium-based member for forming according to the present invention is characterized in that, in the above-mentioned invention, it is used for rolling, forging, pressing, extrusion, drawing, or drawing.

  Further, the magnesium-based member for molding according to the present invention is the above-described invention, wherein the thin film has a gas nozzle for injecting the gas and the magnesium or magnesium alloy powder at a 45 ° angle from a direction perpendicular to the surface of the substrate. It is characterized by being formed by spraying the magnesium or magnesium alloy powder in an inclined state.

  The magnesium-based member for forming according to the present invention is made of magnesium or magnesium by cold spraying, that is, by accelerating a powder made of magnesium or a magnesium alloy together with a gas and spraying and depositing it on the surface of the substrate in a solid state. Since a thin film made of an alloy is formed, there is little segregation or deviation in crystal orientation, and since the crystal grains are fine, a magnesium-based member that can be easily formed can be obtained. Moreover, since the magnesium-based member for forming according to the present invention can directly produce a plate material having a target thickness, it is possible to reduce subsequent processing steps such as rolling and pressing.

FIG. 1 is a cross-sectional view of a magnesium-based member for forming according to an embodiment of the present invention. FIG. 2 is a schematic view showing an outline of a cold spray apparatus used for manufacturing a magnesium-based member for forming according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of a magnesium-based member for forming according to Modification 1 of the embodiment of the present invention. FIG. 4 is a cross-sectional view of a magnesium-based member for forming according to Modification 2 of the embodiment of the present invention. FIG. 5 is a schematic diagram for explaining the production of a magnesium-based member for forming according to Modification 2 of the embodiment of the present invention.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by the following embodiment. The drawings referred to in the following description only schematically show the shape, size, and positional relationship so that the contents of the present invention can be understood. That is, the present invention is not limited only to the shape, size, and positional relationship illustrated in each drawing.

(Embodiment)
FIG. 1 is a cross-sectional view of a magnesium-based member 1 for forming according to an embodiment of the present invention. As shown in FIG. 1, a magnesium-based member 1 for forming according to an embodiment of the present invention includes a base 2 and a thin film 3.

  Although the base material 2 consists of a metal or an alloy, metals or alloys, such as titanium or a titanium alloy, aluminum or an aluminum alloy, nickel or a nickel alloy, copper or a copper alloy, stainless steel, are preferable.

  The thin film 3 is a magnesium or magnesium alloy layer formed by accelerating a powder made of magnesium or a magnesium alloy together with a gas on the surface of the base material 2 and spraying and depositing the powder on the surface of the base material 2 in a solid state. It is. Magnesium or magnesium alloy forming the thin film 3 includes pure magnesium having a magnesium content of 95% by mass or more, magnesium-aluminum alloy (AM series), magnesium-aluminum-zinc alloy (AZ series), magnesium-zinc-zirconium. Powders such as alloys (ZK series) and magnesium-copper-zinc alloys (ZC series) can be used.

  In the magnesium-based member 1 for molding according to the embodiment of the present invention, the ratio of the thickness of the thin film 3 to the thickness of the magnesium-based member 1 for molding is 50% or more from the viewpoint of weight reduction or the like. It is preferably 70% or more.

  Next, the production of the magnesium-based member 1 for forming according to the present embodiment will be described. FIG. 2 is a schematic diagram showing an outline of a cold spray device used for manufacturing the magnesium-based member 1 for forming according to the embodiment of the present invention. A cold spray device 10 shown in FIG. 2 is heated by a gas heater 11 that heats a compressed gas, a powder supply device 12 that contains magnesium or a magnesium alloy powder that is a material of the thin film 3 and supplies the powder to a spray gun 13. A gas nozzle 14 for injecting the compressed gas and the material powder supplied thereto onto the substrate, and valves 15 and 16 for adjusting the amount of compressed gas supplied to the gas heater 11 and the powder supply device 12, respectively.

  In the cold spray apparatus 10 as shown in FIG. 2, the powder which consists of magnesium or a magnesium alloy with the compressed gas heated with the gas heater 11 from the gas nozzle 14 is sprayed and deposited on the surface of the base material 2 in the solid-phase state. Thus, the thin film 3 made of magnesium or a magnesium alloy is formed. In FIG. 2, the gas nozzle 14 injects the material powder from a direction perpendicular to the surface of the base material 2, but the gas nozzle 14 injects the material powder in a state inclined with respect to the surface of the base material 2. You may inject it. The gas nozzle 14 can be injected in a state where the gas nozzle 14 is inclined by 45 ° from the vertical direction with respect to the substrate 2. The thin film 3 formed by the cold spray apparatus 10 can reduce the deviation of crystal orientation from that produced by rolling, but the thin film 3 was formed by spraying material powder onto the base material 2 with the gas nozzle 14 inclined. In this case, since the inclination can be given to the laminating direction and the subsequent reduction direction, the rollability can be further improved.

In the cold spray apparatus 10 as shown in FIG. 2, helium, nitrogen, air or the like is used as the compressed gas. The compressed gas supplied to the gas heater 11 is, for example, 50 ° C. or higher, heated to a temperature in a range lower than the melting point of magnesium or a magnesium alloy that is the material powder of the thin film 3, and then supplied to the spray gun 13. Is done. The heating temperature of the compressed gas is preferably 400 to 600 ° C.
On the other hand, the compressed gas supplied to the powder supply device 12 supplies the material powder in the powder supply device 12 to the spray gun 13 so that a predetermined discharge amount is obtained.

  The heated compressed gas is made a supersonic flow (about 340 m / s or more) by the gas nozzle 14 having a divergent shape. The gas pressure of the compressed gas at this time is preferably about 1 to 5 MPa. This is because the adhesion strength of the thin film 3 and the density of the thin film 3 can be improved by adjusting the pressure and temperature of the compressed gas to this extent. More preferably, the treatment is performed at a pressure of about 3 to 5 MPa. The powder material supplied to the spray gun 13 is accelerated by the injection of the compressed gas into the supersonic flow, and collides and deposits on the substrate 2 at a high speed in the solid state to form the thin film 3. To do. Note that the apparatus is not limited to the cold spray apparatus 10 shown in FIG. 2 as long as the apparatus can form the thin film 3 by causing the material powder to collide with the base material 2 in a solid state. In addition, it is preferable to heat the base material 2 to about 250 ° C. during the formation of the thin film 3 made of magnesium or a magnesium alloy. By heating the base material 2, the workability of the thin film 3 made of magnesium or a magnesium alloy is improved, and the density of the thin film 3 is improved.

  In the cold spray device 10, the thickness of the thin film 3 can be adjusted to an arbitrary thickness. Therefore, the forming magnesium-based member 1 manufactured as described above is subjected to forming processing such as rolling and pressing as it is. Although it can be performed, rolling may be performed as necessary to make the thickness tolerance of the thin film 3 uniform.

  The magnesium-based member 1 for forming according to the embodiment of the present invention forms a thin film 3 made of magnesium or a magnesium alloy by a cold spray method, but the magnesium or magnesium alloy powder discharged together with the compressed gas from the gas nozzle 14 is solid. Since the layers are laminated in a phase state, there is little segregation of magnesium or magnesium alloy in the thin film 3. In addition, since a large processing strain is applied to the film formation, crystal grains can be refined by dynamic recrystallization during film formation or heat treatment after film formation. Thereby, the magnesium-based member 1 for forming according to the embodiment of the present invention can suppress cracks and the like during forming such as rolling, pressing, extrusion, drawing, drawing or the like.

  In addition, in Embodiment 1, although the plate-shaped magnesium-based member 1 for forming processing has been described, the magnesium-based member for forming processing is not limited to a plate shape, and magnesium or A thin film made of a magnesium alloy may be formed. In such a case, a thin film made of magnesium or a magnesium alloy may be formed on the substrate by a cold spray method while rotating the columnar substrate.

  In addition, the material powder which consists of the same metal or alloy as the base material 2, or a metal or alloy different from the base material 2 with gas on the surface on the opposite side to the surface which contacts the base material 2 of the thin film 3 which consists of magnesium or a magnesium alloy. The coating may be formed by accelerating and spraying the surface of the thin film 3 in the solid state.

  FIG. 3 is a cross-sectional view of a magnesium-based member for forming according to Modification 1 of the embodiment of the present invention. In addition to the base material 2 and the thin film 3, the magnesium-based member 1 </ b> A for forming processing according to Modification 1 includes a film 4. The coating 4 is a material powder made of the same metal or alloy as the base material 2 or a metal or alloy different from the base material 2. In the cold spray apparatus 10 as shown in FIG. The material powder that forms the film 4 together with the heated compressed gas is sprayed and deposited on the surface of the thin film 3 opposite to the surface in contact with the substrate 2 in the solid state.

  In the formation of the film 4, as the compressed gas, helium, nitrogen, air, and the like similar to the compressed gas used when forming the thin film 3 are used. The compressed gas is, for example, 50 ° C. or higher and heated to a temperature in a range lower than the melting point of the material powder of the film 4 and then supplied to the spray gun 13. Since the magnesium-based member 1A for forming according to the first modification of the embodiment of the present invention has little segregation of magnesium or magnesium alloy in the thin film 3 and a large processing strain is applied to the film formation, The crystal grains can be refined by mechanical recrystallization or heat treatment after film formation. Therefore, even if it is a case where the base material 2 and the membrane | film | coat 4 are provided on the both sides of the thin film 3, the processing allowance of subsequent rolling and a press can be taken largely.

  In the first modification of the first embodiment, the plate-shaped magnesium-based member A for forming processing has been described. However, a thin film made of magnesium or a magnesium alloy is formed on the side surface of the columnar base material, and the base is formed on the thin film. The film may be formed by accelerating a material powder made of the same metal or alloy as the material or a metal or alloy different from the base material together with the gas and spraying it on the surface of the thin film in a solid state.

  Further, the magnesium-based member for molding according to the present invention may be composed only of the thin film 3 from which the base material 2 is removed in the magnesium-based member 1 for molding according to the embodiment of the present invention. FIG. 4 is a cross-sectional view of a magnesium-based member for forming according to Modification 2 of the embodiment of the present invention.

  The magnesium-based member 1 </ b> B for forming according to Modification 2 is composed of only the thin film 3. The magnesium-based member 1B for forming can be manufactured by removing the base material 2 by cutting or peeling after producing the magnesium-based member 1 for forming according to the embodiment of the present invention. In addition, the magnesium-based member 1B for forming processing according to the modification 2 can be continuously manufactured by forming a thin film on the side surface of the cylindrical base material and winding the obtained thin film with a winding roll. .

  FIG. 5 is a schematic diagram for explaining the production of a magnesium-based member for forming according to Modification 2 of the embodiment of the present invention. As shown in FIG. 5, the thin film 3 is formed by forming the thin film 3 on the side surface of the rotating columnar substrate 2B while rotating the columnar substrate 2B with the central axis of the column as the rotation axis. By winding the thin film 3 with the take-up roll 5, the magnesium-based member 1B for forming can be continuously produced.

DESCRIPTION OF SYMBOLS 1 Magnesium-type member for shaping | molding processing 2 Base material 3 Thin film 4 Film 5 Winding roll 10 Cold spray apparatus 11 Gas heater 12 Powder supply apparatus 13 Spray gun 14 Gas nozzle 15 Valve

Claims (4)

On the surface of a substrate made of a metal or alloy, a powder made of magnesium or a magnesium alloy to accelerate with the gas, a thin film was formed by the depositing by blowing while the solid state, the thin film, the gas and A molding characterized in that the magnesium or magnesium alloy powder is formed by injecting the magnesium or magnesium alloy powder in a state where the gas nozzle for injecting the magnesium or magnesium alloy powder is inclined at 45 ° with respect to the surface of the substrate. Manufacturing method of magnesium-based member for processing. To the substrate surface in contact with the opposite surface of the thin film, a material powder composed of the substrate and the same metal or alloy or a base material with a metal or metal alloy different from, it accelerated together with the gas, the solid on the surface of the thin film 2. The method for producing a magnesium-based member for forming according to claim 1, wherein the film is formed by spraying and depositing in a phase state. The method for producing a magnesium-based member for forming according to claim 1, wherein the base material is removed after the thin film is formed. The method for producing a magnesium-based member for forming according to any one of claims 1 to 3, wherein the method is for rolling, forging, pressing, extrusion, drawing, or drawing.

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