WO2008143328A1 - Procédé pour un travail à froid d'un alliage de magnésium - Google Patents

Procédé pour un travail à froid d'un alliage de magnésium Download PDF

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Publication number
WO2008143328A1
WO2008143328A1 PCT/JP2008/059484 JP2008059484W WO2008143328A1 WO 2008143328 A1 WO2008143328 A1 WO 2008143328A1 JP 2008059484 W JP2008059484 W JP 2008059484W WO 2008143328 A1 WO2008143328 A1 WO 2008143328A1
Authority
WO
WIPO (PCT)
Prior art keywords
shots
magnesium alloy
cold working
shot peening
magnesium
Prior art date
Application number
PCT/JP2008/059484
Other languages
English (en)
Inventor
Yuji Kobayashi
Satoru Ujihashi
Tsutomu Murai
Shinpei Iwakami
Original Assignee
Sintokogio, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sintokogio, Ltd. filed Critical Sintokogio, Ltd.
Publication of WO2008143328A1 publication Critical patent/WO2008143328A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C11/00—Selection of abrasive materials or additives for abrasive blasts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon

Definitions

  • the present inventions relate to a method for a cold working of a magnesium alloy, by which the mechanical characteristics of it are easily and economically improved by projecting shots (shot peening process).
  • a magnesium alloy is widely used as a base metal of various metallic parts such as a bearing, a cast alloy and a reinforcing member because of its superior machinability. Recently, the improvement of its fatigue characteristics is being studied to extend its life.
  • a heat treatment such as T5 temper or T6 temper has been known.
  • T5 temper or T6 temper As shown in Publication 1 and Publication 2, the shot peening process of a surface of a magnesium alloy has also been known.
  • the T5 temper is a method of a heat treatment for strengthening an alloy for castings or a wrought alloy by an artificial aging treatment without a solution heat treatment after casting when the alloy is rapidly cooled after a hot working.
  • the T6 temper is a general heat treatment to achieve a high strength by a combination of the solution heat treatment or quenching and the artificial aging treatment.
  • the solution heat treatment where the alloy is held at a temperature of around 390 ⁇ 540 0 C for several hours, followed by water quenching, is combined with the artificial aging treatment, where it is held at a temperature of 140 ⁇ 200 °C for several hours.
  • Publication 3 discloses shots made of zirconia, which is inert.
  • the invention disclosed in Publication 3 relates to a method for producing stainless steel with a high corrosion resistance. The method is to project the shots made of zirconia on a surface of stainless steel, which is covered with a corrosion-resistant oxide layer, to prevent a part of the material of the shots remaining on the surface of stainless steel from generating corrosion under a saline environment.
  • a magnesium alloy is used as a base metal.
  • the purpose of the present inventions is to solve the above problems. Namely, it is to provide a method for a cold working of a magnesium alloy that utilizes a shot peening process to easily and economically provide a magnesium alloy having a strengthened layer that is superior in mechanical properties in its surface.
  • the method for a cold working of the magnesium alloy of the present inventions is to form a strengthened layer having a high mechanical strength in the surface of the magnesium alloy by a shot peening process with shots made of a ceramic-based material.
  • the material of the shots include any oxide selected from the group of magnesia, zirconia, and zircon, or a nitride, or a boride, or an inter-metallic compound, that it reacts with magnesium with difficulty, and that it is stable.
  • This invention is claimed as claim 3.
  • the surface of the magnesium alloy is treated by a shot peening process with the shots made of the ceramic-based material.
  • no production of a reaction is caused by the contact of the surface of the magnesium alloy with the shots.
  • the strengthened layer is formed in the surface with a clean appearance. As a result, the fatigue characteristics of the magnesium alloy are improved, to achieve an extension of its life.
  • FIG. 1 shows a schematic view of the process of the shot peening according to the present inventions.
  • FIG. 2 shows a schematic view of the process of the shot peening according to the present inventions.
  • Fig. 2 is a graph showing the relationship between the depths of the crossing points in a magnesium alloy after being treated by the shot peening process and the diameters of the shots.
  • Fig.l shows a schematic view of the process of the shot peening.
  • the number “1” denotes the shots.
  • the number “2” denotes a work made of a magnesium alloy.
  • the number “3” denotes a strengthened layer having a high mechanical strength formed by the shot peening process in the surface of the magnesium alloy.
  • the present inventions are characterized in that the strengthened layer 3 is formed in a cold working in the surface of the magnesium alloy by the shot peening process with the shots made of a ceramic-based material.
  • the process can be applied to any kind of magnesium alloy. Typically, it is applied to wrought magnesium alloys such as ASTM AZlO, AZ31, AZ61, and AZ80 and magnesium alloys for castings such as ASTM AZ91D, AM20, AM50A, AM60B, AS21, AE42, and AS41B.
  • wrought magnesium alloys such as ASTM AZlO, AZ31, AZ61, and AZ80
  • magnesium alloys for castings such as ASTM AZ91D, AM20, AM50A, AM60B, AS21, AE42, and AS41B.
  • a ceramic-based material described here for making the shots includes any oxide that is selected from the group of magnesia, zirconia, and zircon, or a nitride, or a boride, or an inter- metallic compound. Such a material is stable, i.e., it reacts with magnesium with difficulty.
  • the ceramic-based material does not necessarily have a certain composition.
  • zircon a material having various specific gravities or mechanical properties that is made by changing the ratio of the components of zirconia and silica can be used. Shots that are coated with a surface layer of the stable material may be used.
  • the diameter of the shots is preferably from 0.05 to 1.0 mm. If it is smaller than 0.05 mm, the weight or load of the shots may be too small to form the strengthened layer with a sufficient thickness. If it is larger than 1.0 mm, the time for achieving a full coverage as measured by a visual coverage (a visual rate of an area of dents by the shots) gets longer. That means less efficiency. Therefore, the diameter of 0.05 ⁇ 1.0 mm is preferable. [0016]
  • the shot peening process described here may use a rotary-projecting method, a vacuum-suction method, a pressure blasting method, and so on.
  • an apparatus for the vacuum -suction method needs a rotary unit for projecting the shots.
  • An apparatus for the pressure blasting method needs a tank for holding pressurized air, and so on.
  • the quantity of the shots to be projected can be increased by increasing the velocity of the projection.
  • the shots of the zirconia-based material for example, have a low specific gravity, such an operation has not been adapted.
  • an excessively high velocity for the projection may damage or break the shots.
  • the pressure and the duration of the projection depend on the types of shots to be used.
  • the shot peening process is performed so that the visual coverage reaches 98% or more.
  • an air pressure of 0.1 - 0.4 MPa is preferable. If the air pressure is less than 0.1 MPa, it is hard for the shots to be projected. If it exceeds 0.4 MPa, the strength of the surface as measured in hardness would be saturated. Therefore, to save energy an air pressure over 0.4 MPa is not preferable.
  • the formation of a surface-strengthened layer can he determined hy the surface hardness (HV), which is increased from the initial value.
  • HV surface hardness
  • the depth of the position from the outermost surface where the value of the hardness starts increasing from the initial value is called the depth of the crossing point.
  • CP the position where the hardness exceeds the background value.
  • the hardness is measured in a cross section at right angles to the plane that is processed.
  • the shots are made of the ceramic-based material, which is a stable chemical compound, not reactive like a normal metal. Therefore, no product of a reaction or a by-product is produced by contact of the shots with the magnesium alloy, which is a reactive metal.
  • the strengthened layer can be easily and economically made in the surface of the work while the appearance of the surface can be kept clean.
  • the present inventions have an advantageous effect to improve fatigue characteristics by hardening the surface to extend the life of a component that includes magnesium.
  • To introduce the present inventions into a manufacturing process only the shot peening process must be added to the existing process. An installation of a furnace for the T5 temper or the T6 temper is not required.
  • Example l As example 1, the shots made of the ceramic-based material were projected onto plates of the magnesium alloys of ASTM AZlO, AZ31, AZ61, and AZ80 as listed in Table 1. The vacuum- suction method was used for projecting the shots.
  • the shots were "ZirShot” (ZrO 2 : 60-70 %, SiO 2 : 28-33 %, 700HV) supplied by Saint-Gobain K.K. (Japan).
  • the size of the particles of the shots was 0.85 mm in diameter.
  • the shot peening process was carried out for 20 seconds at a projecting pressure of 0.35 MPa.
  • the shots were projected from a nozzle 6 mm in diameter. It was located 100 mm away from the plates.
  • Example 2 The magnesium alloy plates of AZ31 were treated by the shot peening process using the vacuum- suction method.
  • the shots were "ZirShot" (Zr ⁇ 2 : 60-70 %, SiO 2 : 28-33 %, 700HV) supplied by Saint-Gobain K.K. (Japan).
  • the sizes of the particles varied, and were 0.12 mm, 0.21 mm, 0.425 mm, and 0.81 mm in diameter.
  • the shot peening process was carried out for 20 seconds at a projecting pressure of 0.35 MPa.
  • the shots were projected from a nozzle 6 mm in diameter. It was located 100 mm away from the plates.
  • 2 is a graph showing the relationship between the depths of the crossing points in the magnesium alloy measured after the treatment by the shot peening process and the diameters of the shots. It was found that as the size of the particles of the shots was enlarged, the surface -hardened layer represented by the depth of the crossing points, or the depth from the outermost surface to a position where the value of the hardness increased from the initial value, increased.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

L'invention concerne un procédé pour un travail à froid d'un alliage de magnésium afin d'améliorer facilement et économiquement ses caractéristiques mécaniques par la projection de grenailles (procédé de grenaillage d'écrouissage). Dans le travail à froid, la surface de l'alliage de magnésium 2 est traitée par le procédé de grenaillage d'écrouissage avec des grenailles faites d'un matériau à base de céramique pour former une couche 3, ayant une résistance mécanique élevée, dans la surface. Des grenailles 1 d'un diamètre moyen de particule de 0,05 à 1,0 mm sont utilisées. Le matériau des grenailles 1 comprend n'importe quel oxyde choisi dans un groupe constitué par l'hydroxyde de magnésium, la zircone et le zircon, ou un nitrure, ou un borure, ou un composé intermétallique. C'est un matériau stable qui réagit difficilement avec le magnésium.
PCT/JP2008/059484 2007-05-17 2008-05-16 Procédé pour un travail à froid d'un alliage de magnésium WO2008143328A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007-131448 2007-05-17
JP2007131448A JP5264104B2 (ja) 2007-05-17 2007-05-17 マグネシウム合金の冷間加工法

Publications (1)

Publication Number Publication Date
WO2008143328A1 true WO2008143328A1 (fr) 2008-11-27

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PCT/JP2008/059484 WO2008143328A1 (fr) 2007-05-17 2008-05-16 Procédé pour un travail à froid d'un alliage de magnésium

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JP (1) JP5264104B2 (fr)
WO (1) WO2008143328A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102922430A (zh) * 2012-11-18 2013-02-13 田欣利 利用弹性覆层喷丸提高工程陶瓷磨削断裂强度的方法
EP2938458A4 (fr) * 2012-12-31 2016-09-28 Saint Gobain Ceramics & Plastics Inc Milieu de grenaillage abrasif et ses procédés de formation et d'utilisation

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101237232B1 (ko) * 2010-10-27 2013-02-26 한국기계연구원 상온 성형성을 향상시킨 마그네슘 합금 판재 및 그 제조방법
JP2012200838A (ja) * 2011-03-28 2012-10-22 Toyota Industries Corp マグネシウム合金およびその製造方法
CN109852912B (zh) * 2017-11-30 2023-04-07 有研工程技术研究院有限公司 一种提高镁合金抗蠕变性能的方法

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JP2001198828A (ja) * 2000-01-20 2001-07-24 Nkk Corp 耐食性に優れたステンレス鋼の製造方法
JP2002292307A (ja) * 2001-03-30 2002-10-08 Hitachi Koki Co Ltd 遠心分離機用ロータ
JP2007009258A (ja) * 2005-06-29 2007-01-18 Furukawa Co Ltd 超塑性マグネシウム合金材の製造法
JP2007245248A (ja) * 2006-03-13 2007-09-27 Honda Motor Co Ltd 軽金属製パネル部品の製造方法および軽金属製パネル部品

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JP3229000B2 (ja) * 1992-04-13 2001-11-12 マツダ株式会社 軽合金製部材の表面の改質方法
JPH08323626A (ja) * 1995-06-06 1996-12-10 Toshiba Tungaloy Co Ltd ショットピーニング方法および処理物品
JPH10166271A (ja) * 1996-12-09 1998-06-23 Sinto Brator Co Ltd 軽合金製品のショットピーニング方法
JP3730015B2 (ja) * 1998-06-02 2005-12-21 株式会社不二機販 金属成品の表面処理方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001198828A (ja) * 2000-01-20 2001-07-24 Nkk Corp 耐食性に優れたステンレス鋼の製造方法
JP2002292307A (ja) * 2001-03-30 2002-10-08 Hitachi Koki Co Ltd 遠心分離機用ロータ
JP2007009258A (ja) * 2005-06-29 2007-01-18 Furukawa Co Ltd 超塑性マグネシウム合金材の製造法
JP2007245248A (ja) * 2006-03-13 2007-09-27 Honda Motor Co Ltd 軽金属製パネル部品の製造方法および軽金属製パネル部品

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102922430A (zh) * 2012-11-18 2013-02-13 田欣利 利用弹性覆层喷丸提高工程陶瓷磨削断裂强度的方法
EP2938458A4 (fr) * 2012-12-31 2016-09-28 Saint Gobain Ceramics & Plastics Inc Milieu de grenaillage abrasif et ses procédés de formation et d'utilisation

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JP5264104B2 (ja) 2013-08-14
JP2008284644A (ja) 2008-11-27

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