JPH0653346B2 - Shot pinning method - Google Patents
Shot pinning methodInfo
- Publication number
- JPH0653346B2 JPH0653346B2 JP8839187A JP8839187A JPH0653346B2 JP H0653346 B2 JPH0653346 B2 JP H0653346B2 JP 8839187 A JP8839187 A JP 8839187A JP 8839187 A JP8839187 A JP 8839187A JP H0653346 B2 JPH0653346 B2 JP H0653346B2
- Authority
- JP
- Japan
- Prior art keywords
- shot
- speed
- sec
- grain size
- steel
- 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.)
- Expired - Lifetime
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Sampling And Sample Adjustment (AREA)
- Heat Treatment Of Steel (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、金属製品にスチールショットを投射してその
疲れ寿命を向上させるいわゆるショットピーニング方法
に関する。Description: TECHNICAL FIELD The present invention relates to a so-called shot peening method for projecting a steel shot on a metal product to improve its fatigue life.
（従来技術と問題点） 従来から行なわれているショットピーニング法において
は、ショット粒径が大きい程、投射速度が速い程、ショ
ットのエネルギが大きくなることから、ショットピーニ
ング効果を向上させるには粒径の大きいスチールショッ
トを高速度で投射する必要がある。しかし、粒径1.4mm
以上のスチールショットを６０m/sec以上の速度で投射
するとスチールショットは割れ、かつ製品に鋭い凹凸の
打痕が生じ、かえって疲れ寿命を低下させるため、それ
らを上げることには限界があった。(Prior Art and Problems) In the conventional shot peening method, the shot energy increases as the shot particle size increases and the projection speed increases. It is necessary to project a steel shot with a large diameter at high speed. However, the particle size is 1.4 mm
When the above steel shots were projected at a speed of 60 m / sec or more, the steel shots cracked and sharp dents and bumps were formed on the product, which rather shortened the fatigue life, so there was a limit to raising them.
そこで、本願発明の発明者たちは、投射によってスチー
ルショットが割れることのないショット粒径と投射速度
について鋭意実験を繰り返えした結果、それらについて
の相関関係を発見することができた。本発明はこの相関
関係に着目して成されたものである。Therefore, the inventors of the present invention have been able to discover a correlation between them as a result of repeating diligent experiments on the shot grain size and the shot speed at which the steel shot is not cracked by the shot. The present invention has been made paying attention to this correlation.
（発明の目的） 本発明は上記の事情に鑑みてなされたもので、疲れ寿命
を増大させる要因である大きい圧縮残留応力を金属製品
に深く生じさせるショットピーニング方法を提供するこ
とを目的とする。(Object of the Invention) The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a shot peening method for deeply causing a large compressive residual stress in a metal product, which is a factor that increases the fatigue life.
（問題点を解決するための手段） 本発明におけるショットピーニング方法は、粒径１．２
ｍｍのスチールショットを速度４０ｍ／ｓｅｃで投射す
る第１工程と、粒径０．６ｍｍのスチールショットを速
度６０ｍ／ｓｅｃで投射する第２工程と、粒径０．３ｍ
ｍのスチールショットを速度８０ｍ／ｓｅｃで投射する
第３工程と、から成ることを特徴とするものである （実施例） 第１図は疲れ試験法の標準試験片に粒径1.2mmのスチー
ルショットを速度４０m/secで投射した時のその試験片
における圧縮残留応力とその深さの関係を示す。この第
１図からは、この場合には圧縮残留応力は比較的深くま
で大きい状態で生じているが、最大値が比較的小さいこ
とが判かる。第２図は標準試験片に粒径0.6mmのスチー
ルショットを速度６０m/secで投射した場合の結果を示
す。(Means for Solving Problems) The shot peening method according to the present invention has a particle size of 1.2.
mm steel shot at a speed of 40 m / sec, a first step, and a steel shot having a particle diameter of 0.6 mm at a speed of 60 m / sec, a second step, and a particle diameter of 0.3 m.
The present invention is characterized in that it comprises a third step of projecting m steel shots at a speed of 80 m / sec. (Example) FIG. 1 shows a steel shot having a grain size of 1.2 mm on a standard test piece of the fatigue test method. The relationship between the compressive residual stress and the depth of the test piece when the is projected at a speed of 40 m / sec. From FIG. 1, it can be seen that in this case, the compressive residual stress is relatively deep and large, but the maximum value is relatively small. FIG. 2 shows the results when a steel shot with a grain size of 0.6 mm was projected onto a standard test piece at a speed of 60 m / sec.
第３図は標準試験片に粒径0.3mmのスチールショットを
速度８０m/secで投射した時の標準試験片における圧縮
残留応力とその深さの関係を示す。この第３図からは、
この場合には圧縮残留応力はその最大値が大きいが浅い
個所にしか生じないことが判る。FIG. 3 shows the relationship between the compressive residual stress and the depth of a standard test piece when a steel shot with a grain size of 0.3 mm was projected onto the standard test piece at a speed of 80 m / sec. From this Figure 3,
In this case, it is understood that the maximum value of the compressive residual stress is large, but it occurs only in a shallow place.
そこで、粒径1.2mmのスチールショットを速度４０m/sec
で、続いて、粒径0.6mmのスチールショットを速度６０m
/secで、最後に粒径0.3mmのスチールショットを速度８
０m/secで順次標準試験片に投射し、この結果を第４図
に示す。この第４図からは、この場合には圧縮残留応力
はその最大値が第３図のときと同程度に大きく、しか
も、第１図のときと同様に比較的高い状態でなだらかに
変化して深くまで生じていることが判る。Therefore, a steel shot with a particle size of 1.2 mm is used at a speed of 40 m / sec.
Then, a steel shot with a grain size of 0.6 mm is run at a speed of 60 m.
/ sec, and finally a steel shot with a grain size of 0.3 mm at a speed of 8
The test pieces were projected sequentially onto the standard test piece at 0 m / sec, and the results are shown in FIG. It can be seen from FIG. 4 that the maximum value of the compressive residual stress in this case is as large as that in FIG. 3, and moreover, as in the case of FIG. You can see that it has occurred deeply.
また、上述のようにして各種のショットピーニング処理
を行った標準試験片について疲れ試験を行った結果を第
５図に示す。なお、第５図において0.3φショットと1.2
φショットの組合せとは、最初粒径1.2mmのスチールシ
ョットを速度６０m/secで投射した後、粒径0.3mmのスチ
ールショットを速度８０m/secで投射してショットピー
ニングを行った場合である。第５図からは、ショット粒
径と投射速度を二段階に変えても効果がほとんどなく、
三段階にわたってショットピーニングした場合に効果が
著しいことが判る。Further, FIG. 5 shows the results of fatigue tests conducted on the standard test pieces that were subjected to various shot peening treatments as described above. In addition, 0.3φ shot and 1.2 in FIG.
The combination of φ shots is a case in which a steel shot having a grain size of 1.2 mm is first projected at a speed of 60 m / sec and then a steel shot having a grain size of 0.3 mm is projected at a speed of 80 m / sec for shot peening. From FIG. 5, there is almost no effect even if the shot particle size and the projection speed are changed in two stages.
It can be seen that the effect is remarkable when shot peening is performed in three steps.
なお、粒径が1.2mmを越えるスチールショットを６０m/s
ecを越える速度で投射するとスチールショットが製品に
衝突した時割れる弊害が生じるので、第１段階ではショ
ット粒径は0.8〜１．２mm、投射速度は３０〜５０m/sec
であることが望ましい。また、第２段階においてはショ
ット粒径は0.4〜0.6mm、投射速度は５０〜７０m/secで
あることが望ましく、７０m/secを越える投射速度にし
ても、ショットピーニング効果は変わらない。さらに、
第３段階においてはショット粒径は0.1〜0.3mm、投射速
度は７０m/sec以上であることが望ましい。ショット粒
径が0.1〜0.3mmでは投射速度を７０m/sec以上にしても
ショットがほとんど割れることはないからである。In addition, 60 m / s for steel shots with a grain size exceeding 1.2 mm
If shot at a speed exceeding ec, the steel shot will be cracked when it hits the product, so in the first stage the shot grain size is 0.8 to 1.2 mm and the shot speed is 30 to 50 m / sec.
Is desirable. In the second stage, the shot grain size is preferably 0.4 to 0.6 mm and the projection speed is preferably 50 to 70 m / sec. Even if the projection speed exceeds 70 m / sec, the shot peening effect does not change. further,
In the third stage, the shot grain size is preferably 0.1 to 0.3 mm and the projection speed is preferably 70 m / sec or more. This is because when the shot grain size is 0.1 to 0.3 mm, the shot is hardly broken even if the projection speed is 70 m / sec or more.
（発明の効果） 以上の説明からも明らかなように本発明は、ショット粒
径を段階的に小さくするとともにその投射速度を段階的
に速くして三段階にわたってショットピーニングをする
ようにしたから、製品に従来より高い圧縮残留応力を生
じさせるとともに従来と同様に深く生じさせることがで
きるため、製品の疲れ寿命を大巾に向上させる優れた効
果を奏する。(Effect of the invention) As is apparent from the above description, the present invention reduces shot particle size stepwise and increases its projection speed stepwise to perform shot peening over three steps. Since it is possible to generate a compressive residual stress higher in the product and deeper in the same manner as in the conventional product, an excellent effect of greatly improving the fatigue life of the product is exhibited.
第１図〜第４図はショット粒径と投射速度をそれぞれ変
えて標準試験片にショットを投射した時の圧縮残留応力
とその深さの関係を示すグラフ、第５図は各種のショッ
トピーニングを施した試験片について疲れ試験を行った
結果を示すグラフである。1 to 4 are graphs showing the relationship between the compressive residual stress and the depth when a shot is projected onto a standard test piece by changing the shot particle size and the projection speed, and FIG. 5 shows various shot peening. It is a graph which shows the result of having performed the fatigue test about the applied test piece.
Claims (1)
４０ｍ／ｓｅｃで投射する第１工程と、粒径０．６ｍｍ
のスチールショットを速度６０ｍ／ｓｅｃで投射する第
２工程と、粒径０．３ｍｍのスチールショットを速度８
０ｍ／ｓｅｃで投射する第３工程と、から成ることを特
徴とするショットピーニング方法。1. A first step of projecting a steel shot having a grain size of 1.2 mm at a speed of 40 m / sec, and a grain size of 0.6 mm
Second step of projecting a steel shot of No. 3 at a speed of 60 m / sec, and a steel shot having a grain size of 0.3 mm at a speed of 8
A shot peening method comprising a third step of projecting at 0 m / sec.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8839187A JPH0653346B2 (en) | 1987-04-10 | 1987-04-10 | Shot pinning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8839187A JPH0653346B2 (en) | 1987-04-10 | 1987-04-10 | Shot pinning method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63256362A JPS63256362A (en) | 1988-10-24 |
| JPH0653346B2 true JPH0653346B2 (en) | 1994-07-20 |
Family
ID=13941496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8839187A Expired - Lifetime JPH0653346B2 (en) | 1987-04-10 | 1987-04-10 | Shot pinning method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0653346B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0332573A (en) * | 1989-06-29 | 1991-02-13 | Mitsubishi Motors Corp | Shot peening method |
| JPH03110432A (en) * | 1989-09-25 | 1991-05-10 | Kubota Corp | Manufacture of torque sensor shaft |
| EP0618040B1 (en) * | 1993-03-26 | 1997-06-04 | Fuji Oozx Inc. | Method of treating the surface of a valve lifter |
| US6449998B1 (en) * | 1999-03-24 | 2002-09-17 | Sintokogio, Ltd. | Shot peening method and device therefor |
| JP4800912B2 (en) * | 2006-11-29 | 2011-10-26 | 旭テック株式会社 | Light alloy products |
| JP2008132457A (en) * | 2006-11-29 | 2008-06-12 | Asahi Tec Corp | Coating method of aluminum wheel for vehicles |
-
1987
- 1987-04-10 JP JP8839187A patent/JPH0653346B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63256362A (en) | 1988-10-24 |
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