JPH0653347B2 - Method of strengthening plate-shaped metal materials - Google Patents
Method of strengthening plate-shaped metal materialsInfo
- Publication number
- JPH0653347B2 JPH0653347B2 JP63143303A JP14330388A JPH0653347B2 JP H0653347 B2 JPH0653347 B2 JP H0653347B2 JP 63143303 A JP63143303 A JP 63143303A JP 14330388 A JP14330388 A JP 14330388A JP H0653347 B2 JPH0653347 B2 JP H0653347B2
- Authority
- JP
- Japan
- Prior art keywords
- shaped metal
- metal material
- plate
- shot
- shot peening
- 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
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- Laminated Bodies (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Description
【発明の詳細な説明】 ａ．産業上の利用分野 本発明は、ショットピーニング加工を施すことにより板
状金属材料の強度を向上させるようにした板状金属材料
の強化方法に関する。DETAILED DESCRIPTION OF THE INVENTION a. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for strengthening a plate-shaped metal material, which is configured to improve the strength of the plate-shaped metal material by performing shot peening.
ｂ．従来技術 板状金属材料の強度の向上を図るために、板状金属材料
にショット粒を投射し、ショット粒投射部分を局部的に
圧縮して圧縮応力（残留応力）を付与せしめるようなシ
ョットピーニング加工方法が従来より広く用いられてい
る。b. Conventional technology In order to improve the strength of a plate-shaped metal material, shot peening is performed by projecting shot particles onto the plate-shaped metal material and locally compressing the shot particle projection portion to give compressive stress (residual stress). The processing method has been widely used from the past.
第５図及び第６図は従来より一般に用いられているショ
ットピーニング加工方法を示すものである。ショットピ
ーニング加工を行なうに当っては、板状金属材料10を垂
直状に立てた状態で固定支持すると共に、その上下左右
の縁部を覆う一対の遮蔽部材11a,11bを板状金属材料10
の表裏両面に取付ける。しかる後に、一対のショット粒
投射装置（図示せず）から金属材料10の強化すべき箇所
の両面の全域に向けてショット粒を矢印で示す如く投射
し、これによりショットピーニング加工を施すようにし
ている。FIG. 5 and FIG. 6 show a shot peening processing method which has been generally used conventionally. In performing the shot peening process, the plate-shaped metal material 10 is fixedly supported in a vertically standing state, and a pair of shielding members 11a and 11b covering the upper, lower, left, and right edges of the plate-shaped metal material 10 are provided.
Install on both front and back sides of. After that, shot particles are projected from a pair of shot particle projection devices (not shown) toward the entire area of both surfaces of the metal material 10 to be strengthened as shown by arrows, whereby shot peening processing is performed. There is.
ｃ．発明が解決しようとする課題 上述の如くショットピーニング加工を施した場合、金属
材料10から遮蔽部材11a,11bを取り外すと、それに伴っ
て金属材料10に変形（反り）が発生してしまうことが多
々ある。この変形が発生するのは、ショット粒投射前に
おいて金属材料10の有する残留応力が両面共に全く同じ
大きさとなることは非常に稀であり、両面の残留応力が
互いに異なることと、それに加えて初めから反りが存在
していることに起因する。そして、この変形の形状は、
異なる残留応力を有する両面に向って、両側より同一速
度のショット粒を投射した場合、どちらか一方の側の面
が湾曲状にへこみ、その反対側の面が湾曲状にふくらむ
形状となる。また、金属材料10の変形量は、ショット粒
投射速度が高速であればあるほど大きくなる。c. Problems to be Solved by the Invention When the shot peening process is performed as described above, when the shielding members 11a and 11b are removed from the metal material 10, the metal material 10 is often deformed (warped) along with it. is there. This deformation occurs because it is very rare that the residual stress of the metal material 10 on both surfaces becomes exactly the same on both surfaces before shot grain projection. Due to the presence of warpage. And the shape of this deformation is
When shot grains having the same speed are projected from both sides having different residual stresses, the surface on one side dents into a curved shape and the surface on the opposite side bulges into a curved shape. Further, the amount of deformation of the metal material 10 increases as the shot particle projection speed increases.
従って、この変形を小さく押えるためには、ショット粒
投射速度を比較的低速に抑えざるを得ない。しかしなが
ら、ショット粒投射速度を金属材料10に変形が発生しな
い程度の速度にてショット粒投射時間を長く設定するこ
とによって或る程度の圧縮応力を金属材料10に付与する
ことは可能であるが、材料強化に必要な程度の大きさの
圧縮応力値を得ることができない場合が多々ある。Therefore, in order to suppress this deformation to a small extent, the shot grain projection speed must be kept relatively low. However, although it is possible to give a certain amount of compressive stress to the metal material 10 by setting the shot particle projection time long at a speed at which the deformation of the shot particle projection speed does not occur in the metal material 10, In many cases, it is not possible to obtain a compressive stress value that is large enough to strengthen the material.
本発明は、上述の如き実状に鑑みてなされたものであっ
て、その目的は、強化すべき領域の全面ではなくそれよ
りも狭い領域のみのショットピーニング加工であっても
板状金属材料に充分な圧縮応力を付与でき、しかも変形
を少く抑えることができるような板状金属材料の強化方
法を提供することにある。The present invention has been made in view of the above circumstances, and an object thereof is to perform plate peening on metal materials even if the shot peening process is performed only in a narrower region than the entire region to be strengthened. Another object of the present invention is to provide a method for strengthening a plate-shaped metal material that can apply various compressive stresses and can suppress deformation to a small extent.
ｄ．課題を解決するための手段 上述の目的を達成するために、本発明では、ショットピ
ーニング加工を施すことにより板状金属材料の強度を向
上させるようにした板状金属材料の強化方法において、
板状金属材料のうち、強化すべき領域内において等間隔
で一列状に配列された多数の散在箇所にショット粒を前
記板状金属材料の両面側からそれぞれ投射することによ
り、これらの散在箇所に圧縮応力を生ぜしめると共に、
互いに隣接する散在箇所の間の領域に前記散在箇所の圧
縮応力よりも大きな圧縮応力を付与せしめるようにして
いる。d. Means for Solving the Problems In order to achieve the above-mentioned object, in the present invention, in a method for strengthening a plate-shaped metal material, the strength of the plate-shaped metal material is improved by performing shot peening.
In the plate-shaped metal material, shot particles are respectively projected from both surface sides of the plate-shaped metal material to a large number of scattered points arranged in a line at equal intervals in the region to be strengthened, so that these scattered points are scattered. In addition to producing compressive stress,
A compressive stress larger than the compressive stress of the scattered points is applied to the region between the scattered points adjacent to each other.
以下、本発明の一実施例に付き第１図〜第４図を参照し
て説明する。An embodiment of the present invention will be described below with reference to FIGS.
第１図及び第２図は本発明に係る強化方法を説明するた
めのものであって、本例においては、被加工物である板
状金属材料１の外形寸法と同一の寸法を有する一対の遮
蔽部材2a,2b が用いられる。これら一対の遮蔽部材2a,2
b は矩形板に多数の円形開孔３を縦方向及び横方向にそ
れぞれ規則正しく整列配置して成るものである。FIG. 1 and FIG. 2 are for explaining the strengthening method according to the present invention, and in this example, a pair of a pair of external dimensions of the plate-shaped metal material 1 which is the workpiece is used. The shielding members 2a and 2b are used. These pair of shielding members 2a, 2
b is a rectangular plate in which a large number of circular apertures 3 are regularly arranged in the vertical and horizontal directions.
次に、上述の遮蔽部材2a,2b を用いて板状金属材料１を
ショットピーニング加工する場合に付き説明する。Next, a case where the plate-shaped metal material 1 is shot peened by using the above-mentioned shielding members 2a and 2b will be described.
まず、一対の遮蔽部材2a,2b を板状金属材料１の両面に
外縁を合わせた状態で当てがって、これらの遮蔽部材2
a,2b 間に板状金属材料１を挾持する。そして、図外の
締付治具によって板状金属材料１及び遮蔽部材2a,2b を
三者一体の状態で固定すると共に、図外の保持手段にて
これを所定位置に保持する。First, a pair of shielding members 2a and 2b are applied to both sides of the plate-shaped metal material 1 with their outer edges aligned, and the shielding members 2a and 2b are attached.
The plate-shaped metal material 1 is sandwiched between a and 2b. Then, the plate-shaped metal material 1 and the shielding members 2a, 2b are fixed in a three-piece unit by a tightening jig (not shown), and are held at predetermined positions by holding means (not shown).
これにより、板状金属材料１は前記円形開孔３に対応す
る部分Ａが露出された状態で保持手段に取付けられ、か
つ第２図に示すように、表裏一対の遮蔽部材2a,2b の各
円形開孔３が互いに対向配置されている。As a result, the plate-shaped metal material 1 is attached to the holding means in a state where the portion A corresponding to the circular opening 3 is exposed, and, as shown in FIG. 2, each of the pair of front and back shield members 2a, 2b. The circular apertures 3 are arranged to face each other.
このようにして、板状金属材料１をセッティングした後
に、左右両側のショット粒投射装置を作動させて多数の
ショット粒を板状金属材料１の表裏両面に対してそれぞ
れ直角方向に投射し、前記円形開孔３に対応する散在箇
所Ａにショットピーニング加工（塑性加工）を施す。な
お、この際、板状金属材料１の表裏両面のうち前記円形
開孔３に対応する散在箇所Ａ以外の部分は、既述の如く
完全にマスキングされているのでショットピーニング加
工は全く施されない。以上のようにして、所定時間に亘
るショット粒の投射により塑性加工を完了した後、ショ
ット粒の投射を停止し、一連のショットピーニング加工
作業を終了する。After setting the plate-shaped metal material 1 in this manner, the shot particle projection devices on both the left and right sides are operated to project a large number of shot particles on both front and back surfaces of the plate-shaped metal material 1 at right angles. Shot peening processing (plastic processing) is performed on the scattered points A corresponding to the circular openings 3. At this time, the portions other than the scattered portions A corresponding to the circular holes 3 on both the front and back surfaces of the plate-shaped metal material 1 are completely masked as described above, and thus shot peening is not performed at all. As described above, after the plastic working is completed by projecting the shot grains for a predetermined time, the projection of the shot grains is stopped, and the series of shot peening working operations is finished.
次に、上述の如きショットピーニング加工の具体例を以
下に示す。Next, a specific example of the shot peening process as described above will be shown below.
具体例 この具体例によって得られた板状金属材料の表面の残留
応力を測定したところ第３図に示す如き結果となった。Concrete example When the residual stress on the surface of the plate-shaped metal material obtained in this example was measured, the results shown in FIG. 3 were obtained.
第３図における実線は横方向に沿って配列された散在箇
所Ａの中心を結ぶ直線Ｌ１（第１図参照）上の残留応力
をプロットしたものであって、その測定結果から明らか
なように、ショット粒が投射された部分すなわちショッ
トピーニング加工部分Ａには符号ａで示されるような充
分な圧縮応力（負の応力）の発生が認められる。また、
横方向に沿って互いに隣接するショットピーニング加工
部分Ａの間の中央箇所（ショットピーニング加工されて
いない箇所）の残留応力は、符号ｂで示すように両側の
ショットピーニング加工部分Ａの残留応力よりも更に大
きな圧縮応力が生じていることが認められる。また、第
３図における破線は互いに隣接する直線Ｌ１間の直線Ｌ
２（第１図参照）上の残留応力をプロットしたものであ
って、その測定結果か明らかなように、前記直線Ｌ１上
の残留応力よりも小さな値であるがその特性とほぼ同様
の圧縮応力が生じていることが認められる。なお、ショ
ットピーニング加工前の板状金属材料１の残留応力が零
であるとして実験データを修正したところ、第４図に示
す如き結果を得た。The solid line in FIG. 3 is a plot of the residual stress on the straight line L 1 (see FIG. 1) connecting the centers of the scattered points A arranged along the lateral direction, and as is clear from the measurement results. In the portion where the shot grains are projected, that is, in the shot peening processed portion A, generation of sufficient compressive stress (negative stress) as indicated by the symbol a is recognized. Also,
The residual stress at the central portion (the portion not subjected to the shot peening processing) between the shot peening processed portions A adjacent to each other along the lateral direction is higher than the residual stress of the shot peening processed portions A on both sides as indicated by the symbol b. It is recognized that a larger compressive stress is generated. The broken line in FIG. 3 is the straight line L between the straight lines L 1 adjacent to each other.
2 (see FIG. 1) is a plot of residual stress. As is clear from the measurement results, although the value is smaller than the residual stress on the straight line L 1 , the compression is almost the same as the characteristic. It is recognized that stress is occurring. In addition, when the experimental data was corrected assuming that the residual stress of the plate-shaped metal material 1 before the shot peening process was zero, the results shown in FIG. 4 were obtained.
しかして、ショット粒を投射する部分が散在箇所であ
り、ショットピーニング加工領域の面積が相対的に小さ
くても、充分な圧縮応力が板状金属材料１に付与されて
いて充分に強化されていることが確認された。Therefore, the portions for projecting the shot grains are scattered portions, and even if the area of the shot peening processed region is relatively small, sufficient compressive stress is applied to the plate-shaped metal material 1 and it is sufficiently strengthened. It was confirmed.
なお、上述のように一列状に配列された散在箇所Ａにシ
ョットピーニング加工を施すと、通常の予測では、ショ
ットピーニング加工にて衝撃を受けた部分（散在箇所
Ａ）の方がその周辺部分よりも大きな圧縮応力が生じ、
ショットピーニングしない部分には圧縮応力は発生せ
ず、逆に引張応力が発生するものと考えられる。これに
反し、上述の如き現象が生じるのは、ショットピーニン
グによる衝撃部分に対する衝撃力がそれらの衝撃部分
（散在箇所Ａ）の周辺に分散され、この分散された衝撃
力が互いに隣接する衝撃部分の中間箇所で相乗されて大
きな圧縮応力として発現するものと考察される。When the shot peening process is applied to the scattered points A arranged in a line as described above, in a normal prediction, the portion that has been impacted by the shot peening process (the scattered points A) is more than the peripheral portion. Causes a large compressive stress,
It is considered that the compressive stress does not occur in the portion where the shot peening is not performed, but the tensile stress occurs conversely. Contrary to this, the phenomenon as described above occurs because the impact force on the impact parts due to shot peening is dispersed around the impact parts (scattering points A), and the dispersed impact forces of adjacent impact parts are generated. It is considered that they are synergized at the intermediate portion and manifest as a large compressive stress.
以上、本発明の実施例につき述べたが、本発明はこれら
の実施例に限定されるものではなく、本発明の技術的思
想に基づいて各種の変更が可能である。Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications can be made based on the technical idea of the present invention.
例えば、ショット粒投射方向，投射速度，投射時間，粒
径材質等の加工条件並びに円形開孔３の直径及びその間
隔等を適宜変更することによって、圧縮応力の調整を容
易に行なうことが可能である。さらに、板状金属材料１
を回転させつつショットピーニング加工するようにして
もよく、また板状金属材料１の片面のみを固定状態の下
でショットピーニング加工し、その後に１８０゜反転さ
せてもう一方の片面をショットピーニング加工するよう
にしてもよい。For example, it is possible to easily adjust the compressive stress by appropriately changing the processing conditions such as the shot grain projection direction, the projection speed, the projection time, the grain size material, and the diameter of the circular apertures 3 and their intervals. is there. Furthermore, plate-shaped metal material 1
It may be possible to perform the shot peening while rotating the sheet metal. Alternatively, only one side of the plate-shaped metal material 1 is shot peened under a fixed state, and then 180 ° is reversed to perform the shot peening on the other side. You may do it.
さらに、遮蔽部材2a,2b に円形以外（四角形，楕円形）
の形状の開孔を設けてもよい。In addition, the shielding members 2a, 2b are not circular (square, oval)
You may provide the opening of this shape.
また、既述の実施例においては、遮蔽部材2a,2bの円形
開孔３を縦横にそれぞれ等間隔に形成して単位面積当り
の円形開孔３の数を何れの箇所においても同一とした
が、単位面積当りの円形開孔３の数を箇所によって変え
るようにしてもよい。この場合には、その数を少なくし
た箇所におけるショットピーニング加工部分（散材箇所
Ａ）の間の領域Ｂの圧縮応力が相対的に小さくなり、そ
の数を多くした箇所においては相対的に大きくなるた
め、強度の強弱をつけることが可能である。Further, in the above-described embodiment, the circular openings 3 of the shielding members 2a and 2b are formed at equal intervals in the vertical and horizontal directions, and the number of the circular openings 3 per unit area is the same at any position. The number of circular openings 3 per unit area may be changed depending on the location. In this case, the compressive stress in the region B between the shot peened portions (dispersed material portions A) in the portion where the number is small becomes relatively small, and becomes relatively large in the portion where the number is large. Therefore, it is possible to add strength.
また、既述の実施例では、強化すべき板状金属材料１に
縦横に整列配置した散在箇所Ａにショットピーニング加
工を施すようにしたが、幅狭の素材の強化（例えば帯鋸
等の腰入れ等）を行なうために散在箇所Ａを一列のみ配
列する場合にも本発明を適用可能である。Further, in the above-described embodiment, the shot peening process is applied to the scattered points A arranged in the longitudinal and lateral directions on the plate-shaped metal material 1 to be strengthened. However, strengthening of a narrow material (for example, waist insertion such as band saw). The present invention can also be applied to the case where the scattered points A are arranged in only one line in order to perform (1).
ｅ．発明の効果 以上の如く、本発明は板状金属材料のうち、強化すべき
領域内のうちの一部分すなわち等間隔に一列状に配列さ
れた散在箇所にショット粒を投射することにより、これ
らの散在箇所に圧縮応力を生ぜしめると共に、互いに隣
接する散在箇所の間の領域に前記散在箇所の圧縮応力よ
りも大きな圧縮応力を付与せしめるようにしたものであ
るから（第３図及び第４図参照）、強化すべき領域の全
面をショットピーニング加工する場合よりも狭い領域
（散在箇所）に通常の強さのショットピーニング加工を
施すことによって充分な圧縮応力を付与することがで
き、板状金属材料の強化を図ることができる。さらに、
このような作用効果を奏し得るにも拘わらず、狭い領域
（散在箇所）への通常の強さのショットピーニング加工
すなわち全体としては比較的弱いショットピーニング加
工で済むので、板状金属材料の変形の程度もそれに応じ
て少なく抑えることができる。e. EFFECTS OF THE INVENTION As described above, according to the present invention, by projecting shot particles to a part of a region to be strengthened in a plate-shaped metal material, that is, scattered spots arranged in a line at equal intervals, these scattered grains are scattered. This is because the compressive stress is generated at the points, and the compressive stress larger than the compressive stress at the scattered points is applied to the region between the scattered points adjacent to each other (see FIGS. 3 and 4). , It is possible to give sufficient compressive stress by applying shot peening processing of normal strength to a narrower area (dispersed points) than in the case where shot peening processing is applied to the entire area to be strengthened. Can be strengthened. further,
Despite the above-described effects, it is possible to perform shot peening with a normal strength in a narrow area (dispersed portions), that is, with a relatively weak shot peening as a whole. The degree can be reduced accordingly.
また、本発明に係る方法により得られた板状金属材料の
残留応力は散在箇所（ショットピーニング加工部分）の
配列方向に沿って強弱が交互に生じる特性となるため、
強弱の平均値に相当する残留応力が均一に付与されてい
る場合に比べて、より効果的な衝撃吸収能を有すること
となる。Further, the residual stress of the plate-shaped metal material obtained by the method according to the present invention has a characteristic that strengths are alternately generated along the arrangement direction of scattered portions (shot peening processing portions),
As compared with the case where the residual stress corresponding to the average value of the strength is applied uniformly, the impact absorption capacity is more effective.
第１図〜第４図は本発明の一実施例を説明するためのも
のであって、第１図は板状金属材料に遮蔽部材を取付け
た状態を示す正面図、第２図は第１図におけるII−II線
断面図、第３図は本発明の強化方法にて板状金属材料を
強化した場合の残留応力の測定結果を示すグラフ、第４
図は残留応力の測定結果を修正したグラフ、第５図及び
第６図は従来例を説明するためのものであって、第５図
は第１図と同様の正面図、第６図は第５図におけるVI−
VI線断面図である。 １……板状金属材料、2a,2b ……遮蔽部材、 ３……円形開孔、 Ａ……散在箇所（ショットピーニング加工部分）。1 to 4 are for explaining one embodiment of the present invention. FIG. 1 is a front view showing a state in which a shielding member is attached to a plate-shaped metal material, and FIG. II-II sectional view in the drawing, FIG. 3 is a graph showing the measurement results of residual stress when the plate-shaped metal material is reinforced by the strengthening method of the present invention, FIG.
The figure is a graph in which the measurement results of residual stress are corrected, FIGS. 5 and 6 are for explaining a conventional example, FIG. 5 is a front view similar to FIG. 1, and FIG. VI in Figure 5
FIG. 6 is a sectional view taken along line VI. 1 ... Plate-shaped metal material, 2a, 2b ... Shielding member, 3 ... Circular opening, A ... Scattered portion (shot peening processed portion).
Claims (1)
板状金属材料の強度を向上させるようにした板状金属材
料の強化方法において、板状金属材料のうち、強化すべ
き領域内において等間隔で一列状に配列された多数の散
在箇所にショット粒を前記板状金属材料の両面側からそ
れぞれ投射することにより、これらの散在箇所に圧縮応
力を生ぜしめると共に、互いに隣接する散在箇所の間の
領域に前記散在箇所の圧縮応力よりも大きな圧縮応力を
付与せしめるようにしたことを特徴とする板状金属材料
の強化方法。1. A method for strengthening a plate-shaped metal material, wherein the strength of the plate-shaped metal material is improved by subjecting the plate-shaped metal material to shot peening. By projecting shot particles from a plurality of both sides of the plate-shaped metal material to a large number of scattered points arranged in a line, a compressive stress is generated at these scattered points, and in the region between adjacent scattered points. A method for strengthening a plate-shaped metal material, wherein a compressive stress larger than the compressive stress at the scattered portions is applied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63143303A JPH0653347B2 (en) | 1988-06-10 | 1988-06-10 | Method of strengthening plate-shaped metal materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63143303A JPH0653347B2 (en) | 1988-06-10 | 1988-06-10 | Method of strengthening plate-shaped metal materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01310867A JPH01310867A (en) | 1989-12-14 |
| JPH0653347B2 true JPH0653347B2 (en) | 1994-07-20 |
Family
ID=15335622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63143303A Expired - Lifetime JPH0653347B2 (en) | 1988-06-10 | 1988-06-10 | Method of strengthening plate-shaped metal materials |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0653347B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63143304A (en) * | 1986-12-08 | 1988-06-15 | Toshiba Corp | Governing valve control device |
-
1988
- 1988-06-10 JP JP63143303A patent/JPH0653347B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01310867A (en) | 1989-12-14 |
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