JP5264104B2 - Cold working method of magnesium alloy - Google Patents
Cold working method of magnesium alloy Download PDFInfo
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- JP5264104B2 JP5264104B2 JP2007131448A JP2007131448A JP5264104B2 JP 5264104 B2 JP5264104 B2 JP 5264104B2 JP 2007131448 A JP2007131448 A JP 2007131448A JP 2007131448 A JP2007131448 A JP 2007131448A JP 5264104 B2 JP5264104 B2 JP 5264104B2
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000005482 strain hardening Methods 0.000 title claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 45
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000005480 shot peening Methods 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 9
- 229910052845 zircon Inorganic materials 0.000 claims abstract description 8
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000956 alloy Substances 0.000 claims description 11
- 229910045601 alloy Inorganic materials 0.000 claims description 10
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 239000007795 chemical reaction product Substances 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052749 magnesium Inorganic materials 0.000 abstract description 6
- 239000011777 magnesium Substances 0.000 abstract description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract 2
- 239000000919 ceramic Substances 0.000 abstract 1
- 229910000765 intermetallic Inorganic materials 0.000 abstract 1
- 239000000395 magnesium oxide Substances 0.000 abstract 1
- 150000004767 nitrides Chemical class 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 10
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 238000005266 casting Methods 0.000 description 5
- 229910010293 ceramic material Inorganic materials 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- 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
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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
Description
本発明は、マグネシウム合金の機械的特性を、ショット材の噴射加工（ショットピーニング加工）を用いて簡単かつ安価に改善することができるマグネシウム合金の冷間加工法に関するものである。 The present invention relates to a cold working method of a magnesium alloy that can improve the mechanical properties of a magnesium alloy easily and inexpensively by using shot material injection processing (shot peening processing).
従来から、各種金属や合金表面の機械的性質を改善する方法として、金属の組成成分を調整する方法や、特定の熱処理を施す等の方法が知られている。更には、金属にショット材を噴射して表面を改質加工するショットピーニング加工も知られている。 Conventionally, as a method for improving the mechanical properties of various metal and alloy surfaces, a method for adjusting a composition component of the metal and a method for performing a specific heat treatment are known. Furthermore, a shot peening process is also known in which a shot material is sprayed onto a metal to modify the surface.
一方、鋳造用合金や軸受け、補強部材等の各種の金属部品の母材として、加工性に優れたマグネシウム合金が広く使用されているが、最近では、更に疲労特性を向上させ長寿命化を図ることが検討されつつある。
このようなマグネシウム合金の機械的性質を改善する方法として、Ｔ５処理やＴ６処理などの熱処理方法がある。また、特許文献１や特許文献２に示されるように、マグネシウム合金の表面をショットピーニング処理する方法も知られている。
ここで、前記Ｔ５処理とは、鋳物合金、展伸用合金の鋳造後、熱間加工後の冷却速度が速い場合に、溶体化処理を省き、人工時効処理だけを行うことによって強度の向上を図る熱処理方法である。また、Ｔ６処理とは、最高の強度を発揮する為に溶体化処理・焼入れと人工時効処理を組み合わせた処理で、鋳物合金、展伸用合金では３９０〜５４０℃程度の温度で数時間保持して水焼入れする溶体化処理と、１４０〜２００℃に数時間保持する人工時効処理との組み合わせにより高強度を得る一般的な熱処理方法である。
On the other hand, magnesium alloys with excellent workability are widely used as base materials for various metal parts such as casting alloys, bearings, and reinforcing members. Recently, however, fatigue characteristics have been further improved to extend the life. Is being considered.
As a method for improving the mechanical properties of such a magnesium alloy, there is a heat treatment method such as T5 treatment or T6 treatment. Moreover, as shown in Patent Document 1 and Patent Document 2, a method of performing shot peening treatment on the surface of a magnesium alloy is also known.
Here, the T5 treatment refers to the improvement of strength by omitting the solution treatment and performing only the artificial aging treatment when the cooling rate after hot working is high after casting the casting alloy and the wrought alloy. This is a heat treatment method. The T6 treatment is a treatment that combines solution treatment / quenching and artificial aging treatment in order to exhibit the maximum strength. For casting alloys and wrought alloys, the temperature is maintained at a temperature of about 390-540 ° C. for several hours. It is a general heat treatment method that obtains high strength by a combination of solution treatment for water quenching and artificial aging treatment held at 140 to 200 ° C. for several hours.
しかしながら、前記熱処理方法においては、マグネシウム合金が高温で酸化しやすいため、これら熱処理方法の適用に際し、真空中あるいは不活性雰囲気中で行うなどの対策が必要になり、新たな加熱炉を増設する必要があるという問題点や、装置が大型化して既存のラインをそのまま利用することができないという問題点があった。
また、ショットピーニング処理方法においては、マグネシウムが活性で反応しやすいため通常の金属製ショット材を用いると、合金表面にショット材との合金層あるいはマグネシウム合金へショット材が突き刺さり、あるいは鉄系ショット材によって錆が付着したりして損傷を生じるという問題点があった。
However, in the heat treatment method, the magnesium alloy is easily oxidized at a high temperature. Therefore, when these heat treatment methods are applied, it is necessary to take measures such as in vacuum or in an inert atmosphere, and it is necessary to add a new heating furnace. There is a problem that there is a problem, and there is a problem that the existing line cannot be used as it is because the apparatus is enlarged.
Also, in the shot peening treatment method, magnesium is active and easy to react, so if a normal metal shot material is used, the shot material pierces the alloy layer with the shot material or the magnesium alloy on the alloy surface, or iron-based shot material As a result, there is a problem that rust adheres and damage occurs.
なお、特許文献３に示されるように、ショットピーニング処理方法におけるショット材として不活性なジルコニアショット材を使用することが開示されている。しかしながら、特許文献３に記載の発明は、耐食性に優れたステンレス鋼の製造方法に関するものであって、耐食性酸化皮膜で覆われたステンレス鋼をジルコニア系ショット材でショットピーニング処理することにより、その一部がステンレス鋼表面に残留し、これが塩分環境下での腐食の起点となる事を防ぐ対策として用いられるものであり、被加工物がマグネシウム合金である本発明とは母材を全く異にするものである。
本発明は上記のような問題点を解決して、ショットピーニング処理を用い、表面に機械的性質に優れた強化層を有するマグネシウム合金素材を安価かつ簡便に提供することができるマグネシウム合金の冷間加工法を提供することを目的として完成されたものである。 The present invention solves the above-mentioned problems, uses a shot peening treatment, and can provide a magnesium alloy material having a strengthened layer with excellent mechanical properties on the surface at a low cost and in a simple manner. It was completed for the purpose of providing a processing method.
上記課題を解決するためになされた本発明のマグネシウム合金の冷間加工法は、冷間において行うマグネシウム合金の冷間加工法であって、マグネシウム合金の表面にジルコニア又はジルコンを含むショット材でショットピーニング処理のみを行い、合金表面にショット材との接触により反応生成物を作ることなく、機械的強度の高い強化層を形成することを特徴とするものである。 The cold work method of the magnesium alloy of the present invention made to solve the above problems is a cold work method of the magnesium alloy performed in the cold, shot with a shot material containing zirconia or zircon on the surface of the magnesium alloy Only the peening treatment is performed , and a strengthening layer having high mechanical strength is formed on the alloy surface without forming a reaction product by contact with the shot material .
なお、ショット材として、平均粒径が０．０５から１．０ｍｍのものを用いることが好ましく、これを請求項２に係る発明とする。 In addition, it is preferable to use a shot material having an average particle diameter of 0.05 to 1.0 mm, and this is the invention according to claim 2 .
本発明では、全工程を冷間において行うとともに、マグネシウム合金の表面をジルコニア、ジルコンの１種又は２種を含み、マグネシウムと反応しにくい安定な材料からなるショット材でショットピーニング処理加工することで、ショット材とマグネシウム合金表面との接触により反応生成物を作ることなく、クリーンな表面状態を保ちつつ部材表面に安定して強化層を作ることができ、この結果、疲労特性を向上させマグネシウム合金構造材の長寿命化を実現することとなる。 In the present invention, the entire process is performed cold, and the surface of the magnesium alloy is shot peened with a shot material made of a stable material that includes one or two kinds of zirconia and zircon and hardly reacts with magnesium. , Without making a reaction product due to contact between the shot material and the surface of the magnesium alloy, it is possible to stably form a reinforcing layer on the surface of the member while maintaining a clean surface state. As a result, the magnesium alloy improves fatigue characteristics. This will increase the life of the structural material.
以下に、本発明を実施するための最良の形態につき、図面を参照して説明する。
図1は、ショットピーニング処理の様子を示した模式図であり、図１において、１はショット材、２は被加工物であるマグネシウム合金、３はショットピーニング処理によりマグネシウム合金の表面に形成される機械的強度の高い強化層である。
本発明では、前記強化層３を、冷間において、マグネシウム合金の表面をセラミック系材質からなるショット材でショットピーニング処理することにより形成する点に特徴を有する。
The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic view showing a state of shot peening treatment. In FIG. 1, 1 is a shot material, 2 is a magnesium alloy as a workpiece, and 3 is formed on the surface of the magnesium alloy by shot peening treatment. It is a reinforced layer with high mechanical strength.
The present invention is characterized in that the reinforcing layer 3 is formed by subjecting the surface of the magnesium alloy to shot peening with a shot material made of a ceramic material in the cold.
前記の被加工物であるマグネシウム合金としては、その種類を問わないが、ＡＺ１０、ＡＺ３１、ＡＺ６１、ＡＺ８０等の展伸用マグネシウム合金や、ＡＺ９１Ｄ、ＡＭ２０、ＡＭ５０Ａ、ＡＭ６０Ｂ、ＡＳ２１、ＡＥ４２、ＡＳ４１Ｂ等の鋳造用マグネシウム合金に適用される。 The magnesium alloy that is the workpiece is not limited to any kind, but magnesium alloys for expansion such as AZ10, AZ31, AZ61, AZ80, AZ91D, AM20, AM50A, AM60B, AS21, AE42, AS41B, etc. Applies to magnesium alloys for casting.
また、本発明でいうショット材は、ジルコニア、ジルコンの１種又は２種を含み、マグネシウムと反応しにくい安定な材料をいう。組成的には必ずしも一定のものである必要はなく、例えば、ジルコンの場合にはジルコニアとシリカの成分比を変えることで比重や機械的性質の異なるものが選択できる。また、表面処理を施してショット表面にこれらの安定な加工物が形成されているものも使用することができる。 Moreover, the shot material as used in the field of this invention means the stable material which is hard to react with magnesium including 1 type or 2 types of zirconia and zircon . For example, in the case of zircon, by changing the component ratio of zirconia and silica, those having different specific gravity and mechanical properties can be selected. In addition, it is also possible to use a material in which these stable processed products are formed on the shot surface by performing a surface treatment.
前記ショット材の粒径としては、０．０５から１．０ｍｍが望ましい。０．０５ｍｍ未満ではショットの重量・負荷が小さくて、十分な厚みの強化層を形成することが難しくなり、一方、１．０ｍｍを超えると、ビジュアルカバレージ（目視によるショット材打痕の占有面積率）の時間が長くなって処理効率が悪くなるので、０．０５〜１．０ｍｍの範囲が望ましい。 The particle size of the shot material is preferably 0.05 to 1.0 mm. If the thickness is less than 0.05 mm, the shot weight / load is small and it becomes difficult to form a sufficiently thick reinforcing layer. On the other hand, if the thickness exceeds 1.0 mm, the visual coverage (occupied area ratio of shot material dents visually) ) Becomes longer and the processing efficiency becomes worse, so a range of 0.05 to 1.0 mm is desirable.
また本発明において、ショットピーニング処理方法は、回転投射法、エア−吸引法、加圧ブラスト法など、いずれかは問わない。
この場合、エア−吸引法を用いると、装置の構造が簡単になる利点がある。何故なら、回転投射法では投射用の回転ユニットが必要となり、また加圧ブラスト法では加圧タンクなどが必要となるからである。また、加圧式の場合は、噴射速度を大きくすることでショット材の投射量を増加させることができるが、例えば、ジルコニア系ショットは比重が小さいのでその必要がなく、更に噴射速度が大きすぎると割れてしまうことがあるので、そのような調整は行わない。
In the present invention, the shot peening treatment method may be any of a rotational projection method, an air-suction method, a pressure blast method, and the like.
In this case, the use of the air-suction method has an advantage of simplifying the structure of the apparatus. This is because the rotational projection method requires a rotating unit for projection, and the pressurized blast method requires a pressurized tank. In addition, in the case of the pressurization type, it is possible to increase the amount of shot material projected by increasing the injection speed.For example, zirconia-based shots do not need this because the specific gravity is small, and if the injection speed is too high Do not make such adjustments as they may break.
噴射圧力と噴射時間については、使用するショット材の種類によって異なるが、ビジュアルカバレージが９８％以上になる条件で処理する。
また、エア吸引式の場合は、エア−圧力は０．１〜０．４ＭＰａが望ましい。０．１ＭＰａ未満ではショット材が噴出し難く、一方、０．４ＭＰａを超えると、硬度であらわされる強度がサチュレートするので省エネルギーの観点では望ましくない。
The injection pressure and the injection time are different depending on the type of shot material to be used, but are processed under the condition that the visual coverage is 98% or more.
In the case of an air suction type, the air pressure is preferably 0.1 to 0.4 MPa. If the pressure is less than 0.1 MPa, it is difficult for the shot material to be ejected. On the other hand, if it exceeds 0.4 MPa, the strength expressed by the hardness is saturated, which is not desirable from the viewpoint of energy saving.
また、表面改質強化層の生成の判定としては、表面硬さ（ＨＶ）が初期値より増加することで判断できる。後述する実施例においては、加工面に垂直な方向の切断面での硬さが初期値から変化し始めた位置の長さをクロッシングポイント（ＣＰ：バックグランド値を超えた位置）深さとして測定した。 In addition, the determination of the generation of the surface modification enhanced layer can be made by determining that the surface hardness (HV) increases from the initial value. In the examples to be described later, the length of the position at which the hardness at the cut surface in the direction perpendicular to the machining surface starts to change from the initial value is measured as the crossing point (CP: position exceeding the background value) depth. did.
このように本発明では、冷間において、マグネシウム合金の表面をジルコニア、ジルコンの１種又は２種を含み、マグネシウムと反応しにくい安定な材料からなるショット材でショットピーニング処理することにより、合金表面を加工硬化し、結晶粒微細化し、内部欠陥の封孔処理などを行うことで、母材表面にある程度の厚みを持った機械的強度の高い強化層を形成することができる。 As described above, in the present invention, the surface of the magnesium alloy is subjected to shot peening treatment with a shot material made of a stable material that includes one or two kinds of zirconia and zircon and hardly reacts with magnesium. Is hardened, crystal grains are refined, and internal defects are sealed to form a reinforcing layer with a certain degree of mechanical strength on the surface of the base material.
また、本発明は、前記ショット材がジルコニア、ジルコンの１種又は２種を含み、マグネシウムと反応しにくい安定な材料からなるものであり、通常の金属材と異なり安定な化合物であるため、活性金属であるマグネシウム合金表面との接触によって反応生成物を作ることなく、クリーンな表面状態を保ちつつ、部材表面に簡単かつ安価に強化層を作ることができるという利点がある。 In the present invention, the shot material contains one or two kinds of zirconia and zircon and is made of a stable material that hardly reacts with magnesium, and is a stable compound unlike a normal metal material. There is an advantage that the reinforcing layer can be easily and inexpensively formed on the surface of the member while maintaining a clean surface state without forming a reaction product by contact with the surface of the magnesium alloy which is a metal.
この結果、本発明においては、表面硬度が向上して疲労特性が向上し、マグネシウム構造材の長寿命化を可能にするという効果を奏する。また、加工ラインに本発明を導入する場合、既設のラインにショットピーニング処理工程を加えるのみですみ、Ｔ５やＴ６熱処理に必要な炉の増設のような設備の新設、あるいは大規模なレイアウト変更なしに既存のラインをそのまま活用できるという利点もある。更に、加熱のための燃料費や加工時間が長い熱処理方法に比較すると、本発明は数十秒で処理が完了するので、ＣＯ２排出量も少なく、環境に対する負荷削減効果も高いので、地球環境にも優しい技術である。 As a result, in the present invention, the surface hardness is improved, the fatigue characteristics are improved, and the magnesium structure material can be extended in life. In addition, when the present invention is introduced into a processing line, it is only necessary to add a shot peening process to the existing line, and there is no new installation such as an additional furnace required for T5 or T6 heat treatment, or a large-scale layout change. Another advantage is that existing lines can be used as they are. Furthermore, compared with a heat treatment method in which the fuel cost for heating and the processing time are long, the present invention completes the processing in several tens of seconds, so the CO 2 emission amount is small and the environmental load reduction effect is high. It is also a friendly technology.
[実施例１]
実施例１として、エア吸引法の装置を用い、セラミック系材質からなるショット材として、粒径０．８５ｍｍのサンゴバン社製ZirShot（ZrO2：60-70%、SiO2：28-33%、700HV）を噴射圧力０．３５ＭＰａで、径６ｍｍのノズルから噴射距離１００ｍｍで、表１に示すマグネシウム合金の板材ＡＺ１０、ＡＺ３１、ＡＺ６１、ＡＺ８０に対し噴射時間２０秒でショットピーニング処理した場合のビッカース硬さを測定した。
この結果、いずれも処理後の硬さはそれぞれ初期値に比較して大幅に増加していることが確認できた。
[Example 1]
As an example 1, ZirShot (ZrO2: 60-70%, SiO2: 28-33%, 700HV) manufactured by Saint-Gobain Co., Ltd. having a particle diameter of 0.85 mm was used as a shot material made of a ceramic material using an air suction method apparatus. Vickers hardness is measured when shot peening treatment is performed on magnesium alloy plate materials AZ10, AZ31, AZ61, and AZ80 shown in Table 1 with a jetting time of 20 seconds at a jetting pressure of 0.35 MPa and a jetting distance of 100 mm from a nozzle with a diameter of 6 mm. did.
As a result, it was confirmed that the hardness after treatment was significantly increased compared to the initial value.
[実施例２]
マグネシウム合金板材（ＡＺ３１）に対し、エア吸引法の装置を用いセラミック系材質からなるショット材として、粒径を０．１２ｍｍ、０．２１ｍｍ、０．４２５ｍｍ、０．８１ｍｍと変化させたサンゴバン社製ZirShot（ZrO2：60-70%、SiO2：28-33%、700HV）を、噴射圧力０．３５ＭＰａで、径６ｍｍのノズルから噴射距離１００ｍｍ、噴射時間２０秒でショットピーニング処理した。図２は、ショット材噴射後のマグネシウム合金中のクロッシングポイント深さとショット粒径の関係を示すグラフであり、ショット粒径が大きくなるにつれてクロッシングポイント深さ、つまり硬さが初期値から増加した表面からの深さ方向の距離、で示されている表面硬化層が増加することが認められた。
[Example 2]
Made of Saint-Gobain Co., Ltd. with a particle size changed to 0.12 mm, 0.21 mm, 0.425 mm, and 0.81 mm as a shot material made of a ceramic material using an air suction method device against a magnesium alloy plate (AZ31) ZirShot (ZrO2: 60-70%, SiO2: 28-33%, 700HV) was shot peened at a jetting pressure of 0.35 MPa, a jetting distance of 100 mm, and a jetting time of 20 seconds from a 6 mm diameter nozzle. FIG. 2 is a graph showing the relationship between the crossing point depth in the magnesium alloy after shot material injection and the shot particle size, and the surface where the crossing point depth, that is, the hardness increases from the initial value as the shot particle size increases. It was observed that the surface hardened layer indicated by the distance in the depth direction from the surface increased.
１ セラミック系材質からなるショット
２ マグネシウム合金
３ 表面強化層
1 Shot made of ceramic material 2 Magnesium alloy 3 Surface enhancement layer
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