JPS59193215A - Surface toughening method of metal - Google Patents
Surface toughening method of metalInfo
- Publication number
- JPS59193215A JPS59193215A JP6709783A JP6709783A JPS59193215A JP S59193215 A JPS59193215 A JP S59193215A JP 6709783 A JP6709783 A JP 6709783A JP 6709783 A JP6709783 A JP 6709783A JP S59193215 A JPS59193215 A JP S59193215A
- Authority
- JP
- Japan
- Prior art keywords
- metal
- liquid
- cavity
- impact force
- immersed
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
- 239000002184 metal Substances 0.000 title claims abstract description 56
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 238000005728 strengthening Methods 0.000 claims description 16
- 230000003628 erosive effect Effects 0.000 claims description 8
- 230000002787 reinforcement Effects 0.000 claims description 4
- 150000002739 metals Chemical class 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 abstract 1
- 238000005480 shot peening Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000000523 sample Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Nonferrous Metals Or Alloys (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は切欠き部分や油孔部分やキー溝部分の如く疲労
破壊の生じ易い金属の所定表面部分をショットピーニン
グと同様の効果を有するように簡単且つ容易に強化する
ことができ、しかもその強化する所定表面部分がショッ
トピーニングを良好に実施し得ないような狭い部分であ
っても容易且つ確実に実施し得る金属の表面強化法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention simply and easily strengthens predetermined surface areas of metal that are prone to fatigue failure, such as notches, oil holes, and key grooves, so as to have the same effect as shot peening. The present invention relates to a metal surface strengthening method that can be easily and reliably carried out even if the predetermined surface portion to be strengthened is a narrow portion where shot peening cannot be performed well.
従来より金属材料は繰り返し応力が作用せしめられる機
械部品等に多々使用されているが、このように繰り返し
応力が作用せしめられる機械部品等においてはその疲労
強度が問題となっている。BACKGROUND OF THE INVENTION Conventionally, metal materials have been widely used in mechanical parts to which repeated stresses are applied, but fatigue strength has become a problem in mechanical parts to which such repeated stresses are applied.
この疲労強度、すなわち耐久限度を高める方法として繰
り返し応力が作用せしめられる金属の所定表面部分に残
留圧縮応力を付与する方法が広〈実施されており、・こ
のような金属の所定表面部分に残留圧縮応力を付与する
方法としてショットピーニング法が非常に広〈実施され
ている。このショットピーニング法は、金属の所定表面
部分に鋼粒の如きショットを高速で打ちつ【プて表面仕
上げを行なう冷間加工法であって、ショットによる打撃
によって金属の表面に微−小な凹凸が生ずるために回転
部分等においてはその微小な凹部が潤滑油の保持部分と
もなって金属の耐久限度の向上によりその効果を発揮せ
しめている。As a method of increasing this fatigue strength, that is, the durability limit, a method of applying residual compressive stress to a predetermined surface portion of a metal that is subjected to repeated stress is widely practiced. Shot peening is a very widely used method for applying stress. This shot peening method is a cold working method that finishes the surface by hitting a predetermined surface area of the metal with shots such as steel grains at high speed. Because of this, the minute recesses in rotating parts also serve as lubricating oil holding areas, which is effective in improving the durability of metal.
このようにショットピーニング法は非常に優れた金属の
表面強化法であるが、ショットピーニングを施そうとす
る金属の所定表面部分が、切欠きゃキー溝の底部エツジ
部であったり、油孔であったりするような非常に狭い部
分であって、ショットがその部分に有効に噴射供給され
ないような部分であると実施し得ない場合が生ずる欠点
があった。In this way, the shot peening method is an excellent method for strengthening the surface of metals, but if the specified surface area of the metal to be shot peened is a notch, the bottom edge of a keyway, or an oil hole This method has the disadvantage that it may not be possible to implement this technique if the area is very narrow, such as a narrow area where the shot cannot be effectively injected into the area.
本発明者はか）るショットピーニング法の欠点を除去す
べく鋭意研究の結果、液体にキャビティを発生せしめる
と、発生したキャビティが圧）貞する際に生ずる衝撃力
が金属の表面強化に有効であることを究明して本発明を
完成したのである。As a result of intensive research to eliminate the drawbacks of the shot peening method, the present inventor found that when cavities are generated in the liquid, the impact force generated when the cavities are compressed is effective in strengthening the surface of the metal. They investigated certain things and completed the present invention.
すなわち本発明は、液体中に浸漬した金属の所定表面部
分に、該液体に生せしめたキＡ２ヒテイの圧潰に起因す
る衝撃力をエロージョンを生せしめない範囲内で付与す
ることを特徴とする金属の表面強化法を提供するもので
ある。That is, the present invention is characterized in that an impact force caused by the crushing of the metal A2 formed in the liquid is applied to a predetermined surface portion of the metal immersed in the liquid within a range that does not cause erosion. The present invention provides a method for surface strengthening.
以下、図面により本発明に係る金属の表面強化法につい
て詳細に説明する。Hereinafter, the metal surface strengthening method according to the present invention will be explained in detail with reference to the drawings.
第１図は本発明に係る金属の表面強化法の１実施例の説
明用正面図、第２図は本発明に係る金属の表面強化法の
他の実施例の説明用正面図である。FIG. 1 is an explanatory front view of one embodiment of the metal surface strengthening method according to the present invention, and FIG. 2 is an explanatory front view of another embodiment of the metal surface strengthening method according to the present invention.
図面中、１は繰り返し応力が作用せしめられる機械部品
等の金属、２は金属１が浸漬される液体３を収納してい
る容器、４は液体３中に浸漬されている金属１の所定表
面部分に液体３に生ぜしめたキャビティの圧潰に起因す
る衝撃力をエロージョンを生ぜしめない範囲内で付与す
るために液体３にキＡノビティを生ぜしめるキャビティ
発生手段であり、口のキャビティ発生手段としては、第
１図に示す如く金属１が浸漬された液体３中に浸漬され
超音波振動せしめられるホーンや、第２図に示す如く金
属１が浸漬された液体３中に高圧高速の液体を噴射させ
るノズルを備えた手段など種々の手段゛が採用できる。In the drawing, 1 is a metal such as a mechanical part to which repeated stress is applied, 2 is a container containing a liquid 3 in which the metal 1 is immersed, and 4 is a predetermined surface portion of the metal 1 immersed in the liquid 3. This is a cavity generating means that generates a cavity in the liquid 3 in order to apply the impact force due to the collapse of the cavity generated in the liquid 3 within a range that does not cause erosion, and as a cavity generating means in the mouth. As shown in FIG. 1, a horn is immersed in a liquid 3 in which a metal 1 is immersed and vibrated by ultrasonic waves, or a high-pressure and high-velocity liquid is injected into a liquid 3 in which a metal 1 is immersed, as shown in FIG. Various means such as means equipped with a nozzle can be employed.
本発明法は、このよう“に金属１を液体３中に浸漬し、
その液体３に前述したようなキャビティ発生手段４によ
り発生せしめたキャビティの圧潰に起因する衝撃力を金
属１０所定表面部分にエロージョンを生ぜしめない範囲
内で付与することにより金属１の表面を強化する方法で
あり、この本発明法においては液体３中に浸漬した金属
１０所定表面部分に、液体３に生せしめられたキャビデ
ィの圧潰に起因する衝撃力のイ」与をエロージョンを生
ぜしめない範囲内でだけ付与することが重要である。こ
れは金属１０所定表面部分にキＡ７ビテイの圧潰に起因
する衝撃力でエロージョンが生ずると、ショットピーニ
ングと同様の表面強化を行なおうとする金属１の所定表
面部分がエロージョンにより剥離されてしまってキャビ
ティの圧潰に起因する衝撃力を付与した効果が失なわれ
てしまうと共に、表面強化を行なおうとする金属１の所
定表面部分が剥離したことに起因して金属１の表面肌荒
れが促進されてごの剥離部分が新らたな応力集中部分と
なるために疲労強度が低下すると共にその寸法精度に誤
差が生じて機械部品等として好ましくないからである。In the method of the present invention, the metal 1 is immersed in the liquid 3 in this way,
The surface of the metal 1 is strengthened by applying an impact force caused by the crushing of the cavity generated by the cavity generating means 4 as described above to the liquid 3 within a range that does not cause erosion on a predetermined surface portion of the metal 10. In this method, a predetermined surface portion of the metal 10 immersed in the liquid 3 is subjected to an impact force caused by the crushing of the cavity formed in the liquid 3 within a range that does not cause erosion. It is important to give only . This is because when erosion occurs on a predetermined surface portion of the metal 10 due to the impact force caused by the crushing of the bit A7, the predetermined surface portion of the metal 1, which is intended to undergo surface reinforcement similar to shot peening, is peeled off due to the erosion. The effect of applying the impact force due to the crushing of the cavity is lost, and the surface roughness of the metal 1 is accelerated due to peeling of a predetermined surface portion of the metal 1 where surface reinforcement is to be performed. This is because the peeled part becomes a new stress concentration part, which lowers the fatigue strength and causes an error in the dimensional accuracy, making it undesirable as a mechanical part or the like.
以上詳述した本発明に係る金属の表面強化法は、繰り返
し応力が作用せしめられる機械部品等に使用されるとそ
の疲労強度が問題となる金属の所定表面部分に残留圧縮
応力を付与してその疲労強度を向上せしめたり、金属の
所定表面部分に付与した残留圧縮応力に起因Ｊる表面の
硬化によって耐摩耗性を向上せしめたりするショットピ
ーニングと同様の効果を右づる金属の表面強化を簡単且
つ容易に行なうことがこぎ、しかもこのような金属の強
化する所定表面部分がショットピーニングを良好に実施
しくｑないようなすなわちショットだそすの部分に打も
つけられないような金属のの表面部分に設けられている
切欠ぎ部分や油孔部分やキー溝部分の如き狭い部分であ
っても容易且つ確実に実施し、得る画期的な方法であり
、その工朶的価値は非常に大きなものがある。The method for strengthening the surface of metal according to the present invention described in detail above applies residual compressive stress to a predetermined surface portion of the metal, which poses a problem in fatigue strength when used in mechanical parts etc. to which repeated stress is applied. It is a simple and effective way to strengthen the surface of metals, which has the same effect as shot peening, which improves fatigue strength and hardens the surface due to residual compressive stress applied to a specified surface area of the metal. Shot peening can be easily carried out, and in addition, shot peening may not be carried out well on such metal surface areas, i.e., shot peening cannot be applied to surface areas of the metal. This is an innovative method that can be easily and reliably applied even in narrow areas such as cutouts, oil holes, and key grooves, and its industrial value is extremely large. be.
実施例
冷間引抜材より成る５ｉｏｃ材製の直径６ｍｍの丸棒の
長さ方向の（Ｊは中央部に、開き角度６０度、切欠き深
さ０，６Ｉｌｍ、切欠き底の曲率半径０．４ｍｍとなる
ように型暉状切欠き部を設Ｃａｌたままの試材と、史に
この試材を水中で切欠き部中心とホーン先端の中心とを
一直線上に位置させ切欠き底とホーン先端との間隔を２
．６ｍｍとして１００−１１ Ｏｒ ｐ ｍで回転さｔ
！４ｊがらホーンを周波数１９．２ＫＩＩｚ、出力５０
０’ｖＶＣ超高波振動さけることによって３１０Ｃ材が
浸漬されている水にキヤビテイを発生させ−Ｃ木発明に
係る金属の表面強化法を実施した試材とを＄備し、これ
らの試材をその軸方向に引張・圧縮の繰り返し７応力を
作用させる完全両振り超音波疲労試験を行なった結果、
本発明法を実施しなかった場合の試材Ｃ，Ｌその耐久限
度に相当Ｊ−る正振幅は６５，８Ｉｌであったのに対し
、本発明法を実施した場合の試材はその耐久限度に相当
する正振幅は６９．２４ｚであり、本発明に係る金属の
表面強化法を実施したものは試材として既に冷間引抜加
工によって疲労強度が向上しているために大幅な疲労強
度の向上を明侍し得ないような素材を採用したにもかが
４つら７＋’、その耐久限度が約５％向上したことが確
認できた。Example A round bar with a diameter of 6 mm made of 5IOC material made of cold drawn material (J is at the center, opening angle of 60 degrees, notch depth of 0.6 Ilm, radius of curvature of the notch bottom of 0.6 mm). A sample material with a molded notch with a diameter of 4 mm was placed as it is, and the center of the notch was placed in line with the center of the horn tip in water, and the bottom of the notch and the horn were separated. The distance from the tip is 2
．． Rotated at 100-11 Or p m as 6mm
! 4j horn frequency 19.2KIIz, output 50
By avoiding ultra-high wave vibrations of 0'vVC, a cavity is generated in the water in which the 310C material is immersed. As a result of a complete double-sided ultrasonic fatigue test in which 7 repeated stresses of tension and compression were applied in the axial direction,
When the method of the present invention was not carried out, the positive amplitude of specimens C and L corresponding to their durability limit was 65.8 Il, whereas when the method of the present invention was carried out, the positive amplitude of specimens C and L corresponded to their durability limit. The positive amplitude corresponding to 69.24z is 69.24z, and the fatigue strength of the sample material that has been subjected to the metal surface strengthening method according to the present invention has already been improved by cold drawing, so the fatigue strength is significantly improved. It was confirmed that the durability limit of Moka 4 7+' has been increased by about 5% due to the use of materials that cannot be used.
第１図は本発明に係る金属の表面強化法の１実施例の説
明用正面図、第２図は本発明に係る金属の表面強化法の
他の実施例の説明用正面図である。
１・・・・金属
２・・・・容器
３・・・・液体
４・・・・キャヒティ発生手段
−７゛ｌFIG. 1 is an explanatory front view of one embodiment of the metal surface strengthening method according to the present invention, and FIG. 2 is an explanatory front view of another embodiment of the metal surface strengthening method according to the present invention. 1... Metal 2... Container 3... Liquid 4... Capacity generating means -7゛l
Claims (1)
生ぜしめたキャビティの圧潰に起因する衝撃力をエロー
ジョンを生ぜしめない範囲内で付与することを特徴とす
る金属の表面強化法。 ２ 液体中に浸漬した金属の所定表面部分に衝撃力を（
＝ｊ与するために、液体中に浸漬したホーンに超音波振
動を与えることによって該液体にキャビティを生せしめ
る特許請求の範囲第１項に記載の金属の表面強化法。 ３ 液体中に浸漬した金属の所定表面部分に衝撃力を付
与するために、液体中にノズルより高圧高流速の液体を
噴射することによって該液体にキャビティを生ぜしめる
特許請求の範囲第１項に記載の金属の表面強化法。 ４Ｆａ、体に生ぜしめたキャビティの圧潰に起因するＩ
ｌｉ撃力をエロージョンを生せしめない範囲内で付与さ
れる金属の所定表面部分が、疲労破壊の生じ易い部分で
ある特Ｒ′［請求の範囲第２項又は第３項に記載の金属
の表面強化法、。 ５ 疲労破壊の生じ易い金属の所定表面部分が、金属の
表面部分に設（プられＣいる切欠き部分である特許請求
の範囲第４項に記載の金属の表面強化法。 ６ 疲労破壊の生じ易い金属の所定表面部分が、金属の
表面部分に設（プられている油孔部分である特許請求の
範囲第４項に記載の金属の表面強化法。 ７ 疲労破壊の生じ易い金属の所定表面部分が、金属の
表面部分に設（プられているキー溝部分である特許請求
の範囲第４項に記載の金属の表面強化法。[Scope of Claims] 1. A metal characterized by applying an impact force caused by the collapse of a cavity created in the liquid to a predetermined surface portion of the metal immersed in a liquid within a range that does not cause erosion. surface reinforcement method. 2 Applying an impact force (
2. A method for strengthening the surface of a metal according to claim 1, wherein a cavity is created in the liquid by applying ultrasonic vibration to a horn immersed in the liquid in order to give =j. 3. In claim 1, in which a cavity is created in a liquid by injecting a high-pressure, high-flow liquid into the liquid from a nozzle in order to apply an impact force to a predetermined surface portion of a metal immersed in the liquid. Method of surface strengthening of metals described. 4Fa, I caused by the collapse of the cavity created in the body
Characteristic R' [the surface of the metal according to claim 2 or 3], wherein the predetermined surface portion of the metal to which the impact force is applied within a range that does not cause erosion is a portion where fatigue fracture is likely to occur. Reinforcement method. 5. The method for strengthening the surface of a metal according to claim 4, wherein the predetermined surface portion of the metal where fatigue fracture is likely to occur is a notch portion formed in the surface portion of the metal. 6. Occurrence of fatigue fracture. The method for strengthening the surface of a metal according to claim 4, wherein the predetermined surface portion of the metal that is susceptible to fatigue fracture is an oil hole portion provided in the surface portion of the metal.7. 5. The method for strengthening the surface of a metal according to claim 4, wherein the portion is a keyway portion provided on a surface portion of the metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6709783A JPS59193215A (en) | 1983-04-18 | 1983-04-18 | Surface toughening method of metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6709783A JPS59193215A (en) | 1983-04-18 | 1983-04-18 | Surface toughening method of metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59193215A true JPS59193215A (en) | 1984-11-01 |
Family
ID=13335034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6709783A Pending JPS59193215A (en) | 1983-04-18 | 1983-04-18 | Surface toughening method of metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59193215A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5305361A (en) * | 1992-01-24 | 1994-04-19 | Hitachi, Ltd. | Method of and apparatus for water-jet peening |
| WO2004029303A1 (en) * | 2002-09-25 | 2004-04-08 | Nippon Steel Corporation | Method of improving fatigue strength of work end portion of steel |
| US20190283903A1 (en) * | 2016-08-31 | 2019-09-19 | Industry-Academic Cooperation Foundation, Dankook University | Crack pepair method for inhibiting crack growth in wall portion by using ultrasonic wave |
-
1983
- 1983-04-18 JP JP6709783A patent/JPS59193215A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5305361A (en) * | 1992-01-24 | 1994-04-19 | Hitachi, Ltd. | Method of and apparatus for water-jet peening |
| WO2004029303A1 (en) * | 2002-09-25 | 2004-04-08 | Nippon Steel Corporation | Method of improving fatigue strength of work end portion of steel |
| US20190283903A1 (en) * | 2016-08-31 | 2019-09-19 | Industry-Academic Cooperation Foundation, Dankook University | Crack pepair method for inhibiting crack growth in wall portion by using ultrasonic wave |
| US10906669B2 (en) * | 2016-08-31 | 2021-02-02 | Ndustry-Academic Cooperation Foundation, Dankook University | Crack pepair method for inhibiting crack growth in wall portion by using ultrasonic wave |
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