JPH06172852A - Residual stress imparting device for dedendum of gear - Google Patents
Residual stress imparting device for dedendum of gearInfo
- Publication number
- JPH06172852A JPH06172852A JP35259392A JP35259392A JPH06172852A JP H06172852 A JPH06172852 A JP H06172852A JP 35259392 A JP35259392 A JP 35259392A JP 35259392 A JP35259392 A JP 35259392A JP H06172852 A JPH06172852 A JP H06172852A
- Authority
- JP
- Japan
- Prior art keywords
- gear
- residual stress
- tooth
- slit
- treated
- 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.)
- Withdrawn
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Gear Processing (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、歯車歯元の残留応力付
与装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a residual stress applying device for a tooth root of a gear.
【０００２】[0002]
【従来の技術】塑性変形可能な金属材料の表面に硬球を
加速して衝突させる表面処理を施すことにより、金属の
疲労強度を向上し得ることが知られている（ショットピ
ーニング）。この硬球の加速方法としては、投射方式と
噴射方式と呼ばれる方法があり、前者は、インペラと呼
ばれる回転羽根車に硬球を投入することにより、インペ
ラの回転力をもって硬球を加速して被加工物に投射する
ものであり、後者は、加圧空気と共に噴気口から硬球を
噴出させることによって硬球を加速し、被加工物に射出
するものである。2. Description of the Related Art It is known that the fatigue strength of a metal can be improved by subjecting a surface of a plastically deformable metal material to a surface treatment for accelerating and colliding hard balls (shot peening). As a method for accelerating the hard sphere, there are methods called a projection method and an injection method. The latter is for projecting, and the latter is for ejecting a hard sphere by ejecting the hard sphere together with the pressurized air from the fumarole to the workpiece.
【０００３】ところで、歯車の歯底部には引張応力が作
用するので、歯底部の疲労強度を向上させるために圧縮
残留応力を付与することが有効である（１９９２年発行
・自動車工業会学術講演会前刷り集９２１号参照）。そ
の一方、歯面部では、対になる歯車との接触のために剪
断応力を含む複雑な応力が作用するため、圧縮残留応力
を付与することによって疲労強度は必ずしも向上しな
い。従って、圧縮残留応力の付与は、歯底部に限定的に
行うことが好ましい。By the way, since a tensile stress acts on the bottom of the gear, it is effective to apply a compressive residual stress to improve the fatigue strength of the bottom of the gear (published in 1992 by the Society of Automotive Engineers of Japan, Lecture Meeting). See Preprint Collection No. 921). On the other hand, in the tooth surface portion, since the complex stress including the shear stress acts due to the contact with the paired gear, the fatigue strength is not necessarily improved by giving the compressive residual stress. Therefore, it is preferable that the compressive residual stress is applied only to the tooth bottom.
【０００４】[0004]
【発明が解決しようとする課題】しかるに、従来のショ
ットピーニング装置で歯車に圧縮残留応力付与処理を実
施しようとすると、投射方式は、装置構造は簡便である
が、投射方向の正確な制御が困難であり、その投射角度
にもばらつきが生じやすいため、硬球が拡散して圧縮残
留応力の付与が必要のない部分にまで衝突したり、表面
に損傷を及ぼしたりする不都合がある。また噴射方式
は、投射方式に比して硬球の衝突範囲は狭くなり、射出
方向の制御も比較的容易ではあるが、現状ではmm単位の
射出位置制御すら困難であり、これも硬球の衝突範囲を
限定するには不十分である。However, if the conventional shot peening apparatus is to be subjected to compressive residual stress imparting processing on the gears, the projection method has a simple apparatus structure, but it is difficult to accurately control the projection direction. However, since the projection angle also tends to vary, there is the inconvenience that the hard spheres diffuse and collide even to the part where the application of compressive residual stress is unnecessary, or the surface is damaged. In addition, the injection method has a narrower range of hard ball collision than the projection method, and it is relatively easy to control the injection direction, but at present it is difficult to even control the injection position in mm. Is insufficient to limit
【０００５】本発明は、このような従来技術の問題点を
解消するべく案出されたものであり、その主な目的は、
必要とする部分にだけ限定的に圧縮残留応力を付与し、
その他の部分の表面損傷を防ぐことが可能な歯車歯元の
残留応力付与装置を提供することにある。The present invention has been devised to solve the above-mentioned problems of the prior art, and its main purpose is to:
Applying compressive residual stress only to the required parts,
An object of the present invention is to provide a residual stress applying device for a tooth root of a gear capable of preventing surface damage to other portions.
【０００６】[0006]
【課題を解決するための手段】このような目的は、本発
明によれば、硬球噴射口から被処理歯車の歯底部に至る
硬球の弾道上に、被処理歯車の歯底部に対する投影寸法
が使用する硬球径を超え被処理歯車の歯底幅寸法以下の
スリットを有する邪魔板を配置し、かつ被処理歯車の歯
底部の所定位置にスリットの中心を整合させるようにす
ることによって達成される。According to the present invention, such an object is to use a projected dimension of the gear to be treated on the trajectory of the hard sphere from the hard sphere injection port to the tooth bottom of the gear to be treated. It is achieved by arranging a baffle plate having a slit whose diameter exceeds the hard ball diameter and which is equal to or less than the bottom width dimension of the gear to be processed, and aligns the center of the slit with a predetermined position of the bottom of the gear to be processed.
【０００７】[0007]
【作用】このような本発明の主要な作用は、歯車の歯底
部のみに圧縮残留応力を付与することで歯底部の疲労強
度を向上させることができることにある。即ち、硬球の
衝突し得る範囲をスリットの隙間寸法で限定し、かつ硬
球の弾道中心に対する歯底部の位置を精密に制御するこ
とにより、歯底部に限定的に硬球を衝突させることがで
きる。従って、歯底部のみに圧縮残留応力を生じさせて
歯車の疲労破壊強度を好適に向上させることが可能とな
る。The main action of the present invention is to improve the fatigue strength of the tooth bottom by applying the compressive residual stress only to the tooth bottom of the gear. That is, by limiting the range in which the hard spheres can collide with the gap size of the slit and precisely controlling the position of the tooth bottom with respect to the center of the trajectory of the hard sphere, the hard spheres can be limitedly collided with the tooth bottom. Therefore, it is possible to generate the compressive residual stress only in the tooth bottom portion and suitably improve the fatigue fracture strength of the gear.
【０００８】なお、ここで言う歯底部とは、図２に符号
６ａで示すように、歯溝に於ける基礎円Ｂより歯元側の
部分で、対になる歯車との接触がない部分のことを指
し、その円周方向寸法を歯底幅寸法Ｗと定義する。The root portion referred to here is a portion of the tooth groove closer to the root than the basic circle B in the tooth groove, as shown by reference numeral 6a, and is a portion which does not come into contact with a pair of gears. The dimension in the circumferential direction is defined as the root width dimension W.
【０００９】[0009]
【実施例】以下に本発明の構成について添付の図面に示
された好適実施例を参照して詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below in detail with reference to the preferred embodiments shown in the accompanying drawings.
【００１０】図１に示すように、本発明装置は、圧縮空
気や遠心力によって硬球を加速するための硬球投射装置
１と、硬球投射装置１に硬球を投入するための硬球供給
装置２と、被処理歯車６を回転支持するためのインデッ
クス装置７とからなっている。これにより、被処理歯車
６の歯溝位置を硬球投射装置１の噴射口３に整合させる
ことができるようになっている。そして硬球投射装置１
の噴射口３から被処理歯車６の歯底部６ａに至る硬球の
弾道上には、使用する硬球径以上、被処理歯車の歯底幅
寸法Ｗ以下の隙間寸法のスリット４が開口した邪魔板５
が配設されている。この邪魔板５のスリット４により、
噴射された硬球のうち、スリット４を通過した硬球だけ
が歯底部６ａに到達し得るようになるため、歯底面以外
の部分には硬球が衝突しないようにすることが可能とな
る。As shown in FIG. 1, the apparatus of the present invention comprises a hard sphere projecting device 1 for accelerating hard spheres by compressed air or centrifugal force, and a hard sphere supplying device 2 for introducing hard spheres into the hard sphere projecting device 1. An index device 7 for rotatably supporting the gear 6 to be processed. As a result, the tooth groove position of the processed gear 6 can be aligned with the injection port 3 of the hard ball projecting device 1. And the ball projecting device 1
On the trajectory of the hard sphere from the injection port 3 to the tooth bottom portion 6a of the gear to be treated 6, a baffle plate 5 having a slit 4 having a gap size not less than the diameter of the hard sphere to be used and not more than the tooth bottom width dimension W of the gear to be treated.
Is provided. By the slit 4 of this baffle plate 5,
Among the injected hard balls, only the hard balls that have passed through the slit 4 can reach the tooth bottom portion 6a, so that the hard balls can be prevented from colliding with the portions other than the tooth bottom surface.
【００１１】処理を施す歯溝を交替する際には、インデ
ックス装置７を１ピッチだけ回転させるが、この時に歯
底部以外の部分に硬球が衝突しないようにする必要があ
る。そのために、噴射口３あるいはスリット４を一時的
に閉じるためのシャッタ装置８が設けられている。When the tooth groove to be treated is changed, the index device 7 is rotated by one pitch, but at this time, it is necessary to prevent the hard balls from colliding with a portion other than the tooth bottom portion. Therefore, a shutter device 8 for temporarily closing the injection port 3 or the slit 4 is provided.
【００１２】インデックス装置７は、公知の精密工作機
械と同様の例えばボールスクリュー機構などを適用し得
る。そしてその位置制御は、ＮＣ制御（Numerical Cont
rol）が特に好ましいが、機械的な位置規定手段（例え
ばリンクやカム機構など）や、電気−油圧サーボを用い
る方法などであっても良い。これらの制御方法により、
歯底部６ａとスリット４との相対位置を０．１μm以下
の設定精度で制御可能である。この設定精度は、歯底幅
寸法Ｗの１／５以下であれば実用上は十分に対応でき
る。As the index device 7, a ball screw mechanism or the like similar to a known precision machine tool can be applied. And the position control is NC control (Numerical Cont
rol) is particularly preferable, but a mechanical position defining means (such as a link or a cam mechanism) or a method using an electro-hydraulic servo may be used. With these control methods,
The relative position between the tooth bottom portion 6a and the slit 4 can be controlled with a setting accuracy of 0.1 μm or less. If this setting accuracy is ⅕ or less of the width W of the tooth root, it can be sufficiently dealt with in practice.
【００１３】硬球の弾道上に於けるスリット４の位置
は、マスキング効果が高まり、歯底面６ａに限定的に硬
球を衝突させることができることから、歯底面６ａにで
きるだけ近接させることが好ましいが、硬球の弾道が拡
散しない範囲で離すことは差し支えない。The position of the slit 4 on the trajectory of the hard sphere is enhanced as the masking effect is increased, and the hard sphere can be made to collide with the tooth bottom surface 6a in a limited manner. There is no problem in separating them so long as their trajectory does not spread.
【００１４】ところで、圧縮残留応力付与に有効な硬球
径は、実用的見地からピーニング加工用のショットと同
程度（０．１５mm以上）とするのが妥当であり、当然、
スリット４の隙間寸法Ｇは０．１５mmを超えるものとす
る必要がある。またスリット４の隙間寸法Ｇが歯底幅寸
法Ｗを超えると、圧縮残留応力付与を必要としない歯面
にまで硬球が衝突し、歯面に圧縮残留応力を生じさせた
り、歯面を損傷したりするという好ましくない結果を生
む。By the way, from a practical point of view, it is appropriate that the diameter of the hard sphere effective for imparting the compressive residual stress is about the same as the shot for peening (0.15 mm or more).
The gap size G of the slit 4 needs to exceed 0.15 mm. Further, when the gap dimension G of the slit 4 exceeds the tooth bottom width dimension W, the hard ball collides with the tooth surface that does not require the application of compressive residual stress, causing compressive residual stress on the tooth surface or damaging the tooth surface. It has the undesirable effect of
【００１５】スリット４の形状は、被処理歯車６の形状
や歯底部６ａの形状に対応して定められ、任意の形状に
て実施可能であるが、一対の板の端縁同士を対向させて
配置し、この対向端縁同士間にスリット４を形成するよ
うにしても良く、この場合には、一対の板を相対接離自
在なように支持することにより、被処理歯車６の歯底幅
寸法Ｗに応じてスリット４の隙間寸法Ｇが可変となるよ
うに構成することができる。なお、歯底幅寸法Ｗが３０
mmを超える大型歯車は、歯底部の疲労強度が比較的問題
とはならないので、スリット４の最大隙間寸法Ｇは３０
mmあれば実用上は十分であろう。The shape of the slit 4 is determined according to the shape of the gear 6 to be processed and the shape of the tooth bottom portion 6a, and it can be implemented in any shape, but the edges of the pair of plates are opposed to each other. The slits 4 may be arranged so that the slits 4 are formed between the opposing end edges. In this case, the bottom width of the gear 6 to be processed is supported by supporting the pair of plates so that they can be relatively contacted and separated from each other. The gap size G of the slit 4 may be variable according to the size W. The root width dimension W is 30
Since the fatigue strength of the tooth bottom does not pose a problem for a large gear having a size of more than mm, the maximum gap dimension G of the slit 4 is 30.
mm is sufficient for practical use.
【００１６】また、スリット４を通過する硬球の衝突範
囲Ａが、図２に示すように歯底幅寸法Ｗより小さい場合
には、スリット位置に応じて被処理歯車６を回転させる
ことにより、歯底部６ａの全体に圧縮残留応力を付与で
きる。When the collision area A of the hard spheres passing through the slit 4 is smaller than the tooth bottom width W as shown in FIG. 2, the gear 6 to be processed is rotated according to the slit position, and Compressive residual stress can be applied to the entire bottom portion 6a.
【００１７】次に、実際に圧縮残留応力付与を実施した
実例データについて説明する。歯車の素材として、ＪＩ
Ｓ−Ｇ−４１０５−１９７９に規定するＳＣＭ４２０Ｈ
規格を満足する化学成分を有する直径８０mmの機械構造
用棒鋼を使用した。この棒鋼を９００℃で２時間加熱保
持した後に空冷して焼き均しを行い、その後ホブ切削に
より歯車形状に粗加工を行った。Next, practical example data in which compression residual stress is actually applied will be described. As a material for gears, JI
SCM420H specified in SG-4105-1979
A steel bar having a diameter of 80 mm and having a chemical composition satisfying the specifications was used. This steel bar was heated and held at 900 ° C. for 2 hours, then air-cooled and averaged, and then rough-worked into a gear shape by hob cutting.
【００１８】さらに研磨加工で仕上げた歯車を、ガス浸
炭：９３０℃／８ｈｒ（Ｃ．Ｐ．＝０．８５）、油焼き
入れ（１２０℃）にて浸炭焼き入れ処理を行い、１８０
℃／１ｈｒ空冷にて焼き戻し処理を行った。この試験歯
車の寸法形状を表１に示す。Further, the gear finished by polishing was carburized and quenched by gas carburizing: 930 ° C./8 hr (CP = 0.85) and oil quenching (120 ° C.), and then 180
A tempering process was performed by air cooling at ℃ / 1 hr. Table 1 shows the dimensions and shape of this test gear.
【００１９】[0019]
【表１】 [Table 1]
【００２０】上記歯車について、硬球材質：鋼、硬球
径：０．４mm、１つの歯底部１mm2あたりの硬球投射時
間：３０秒、硬球速度：１００m ／min に設定し、隙間
寸法Ｇ＝３mmのスリット４を介して処理を行った。同時
に、同様の歯車に対して従来の投射式ショットピーニン
グによる処理を行った。その後、歯底部表面に１００kg
ｆ／mm2の引張応力を加え、かつ歯面部接触部にヘルツ
面圧３５０kgｆ／mm2を負荷したときの歯底部及び歯面
が破壊に至るまでの繰り返し回数を測定した。その結果
を表２に示す。For the above gear, the material of hard sphere: steel, the diameter of hard sphere: 0.4 mm, the projection time of hard sphere per 1 mm 2 of the tooth bottom: 30 seconds, the speed of hard sphere: 100 m / min, and the gap size G = 3 mm The treatment was carried out via the slit 4. At the same time, similar projections were processed by conventional shot peening. After that, 100kg on the tooth bottom surface
When a tensile stress of f / mm 2 was applied and a Hertzian surface pressure of 350 kgf / mm 2 was applied to the tooth surface contact portion, the number of repetitions until the bottom of the tooth and the tooth surface were broken was measured. The results are shown in Table 2.
【００２１】[0021]
【表２】 [Table 2]
【００２２】試料Ａ４に示すように、ショットピーニン
グ処理を施さないものは、歯面に疲労破壊が生じる以前
に歯底部から疲労破壊してしまい、歯面の破壊は確認で
きなかった。また試料Ａ３に見られるように、従来のシ
ョットピーニング処理（投射式）を施したものは、ショ
ットピーニング処理を施さないものが破壊した１．２×
１０5回以上の繰り返し応力を負荷しても歯底部は破壊
せず、その強度が向上しているが、歯面は３．０×１０
5回で破壊している。それに対して本発明による処理を
施した試料Ａ１は、歯底部のみに限定的に硬球が衝突し
ているため、歯底部が強化されると共に歯面に悪影響が
及んでいないため、歯底部並びに歯面の破壊までの繰り
返し回数は共に１０7回以上を数えた。As shown in the sample A4, in the case where the shot peening treatment was not performed, the tooth surface was fatigue fractured from the tooth root before the tooth surface was fatigue fractured, and the tooth surface fracture could not be confirmed. Further, as seen in Sample A3, the sample that had been subjected to the conventional shot peening treatment (projection type) was destroyed by the one that was not subjected to the shot peening treatment.
The tooth bottom does not break even when subjected to repeated stress of 10 5 times or more, and its strength is improved, but the tooth surface has 3.0 × 10
Destroyed 5 times. On the other hand, in the sample A1 which has been subjected to the treatment according to the present invention, the hard spheres collide only with the tooth root portion, so that the tooth root portion is strengthened and the tooth surface is not adversely affected. The number of repetitions until the destruction of the surface was 10 7 or more.
【００２３】次に上記と同様の歯車について、スリット
４の隙間寸法Ｇを変化させて処理した結果を表３に示
す。Next, Table 3 shows the results of processing the gears similar to the above by changing the gap dimension G of the slit 4.
【００２４】[0024]
【表３】 [Table 3]
【００２５】試料Ｂ３及びＢ４に示すように、スリット
４の隙間寸法Ｇが歯底幅寸法Ｗより大きい場合は歯面に
も硬球が衝突するため、歯面に疲労破壊が生じる繰り返
し回数が低くなるのに比し、試料Ｂ１及びＢ２に示すよ
うに、スリット４の隙間寸法Ｇが歯底幅寸法Ｗより小さ
い場合は、歯底部の強度が向上すると共に、歯面の強度
低下を抑制していることが分かる。As shown in Samples B3 and B4, when the gap dimension G of the slit 4 is larger than the tooth bottom width dimension W, the hard balls also collide with the tooth surface, and the number of repetitions causing fatigue fracture on the tooth surface becomes low. On the other hand, as shown in Samples B1 and B2, when the gap dimension G of the slit 4 is smaller than the tooth root width dimension W, the strength of the tooth bottom portion is improved and the decrease of the tooth surface strength is suppressed. I understand.
【００２６】次に上記と同様の歯車について、スリット
４と歯底部６ａとの相対位置の設定誤差を変化させると
共に、投射一時停止の有無を変化させて処理した結果を
表４に示す。Table 4 shows the results of processing the gears similar to those described above by changing the setting error of the relative position between the slit 4 and the tooth bottom portion 6a and changing the presence / absence of temporary projection stop.
【００２７】[0027]
【表４】 [Table 4]
【００２８】スリット４と歯底部６ａとの相対位置はレ
ーザ測距器を用いて把握し、設定位置との差を算出し
た。この場合、位置設定誤差が０．６mmの場合は強度低
下を招かないが、位置設定誤差が１．５mmの場合は歯面
に対しても一部の硬球が衝突するため、歯面の破壊に至
るまでの繰り返し回数が低下していることが分かる。ま
た、処理する対象歯底部を切り換える際に硬球噴射を一
時停止しないと、歯面にも硬球が衝突するため、位置設
定制御精度に関わらず歯面の破壊に至るまでの繰り返し
回数が大幅に低下している。The relative position between the slit 4 and the tooth bottom portion 6a was grasped using a laser rangefinder, and the difference from the set position was calculated. In this case, if the position setting error is 0.6 mm, the strength is not reduced, but if the position setting error is 1.5 mm, some hard balls collide against the tooth surface, resulting in damage to the tooth surface. It can be seen that the number of repetitions up to that point has decreased. Also, if the hard sphere injection is not temporarily stopped when switching the target tooth bottom to be processed, the hard spheres will also collide with the tooth surface, so the number of repetitions until the destruction of the tooth surface is greatly reduced regardless of the position setting control accuracy. is doing.
【００２９】ところで、１つの歯底部に対する硬球の投
射時間については、硬球の投射速度、投射数、残留応力
の大きさ、被処理物の材質などの多くの因子によって定
まるため、一概に規定することはできないが、実用上
は、１mm2当り３秒以下では十分な残留応力を付与し得
ないことが確認されている。また過度に長時間にわたる
ことは、生産性やコストの面から見て望ましくないの
で、処理すべき歯車の使用条件に応じて適宜に定めるこ
とが好ましい。By the way, the projection time of a hard sphere on one tooth bottom is determined by many factors such as the projection speed of the hard sphere, the number of projections, the magnitude of residual stress, the material of the object to be treated, etc. However, it has been confirmed in practice that sufficient residual stress cannot be imparted at 3 seconds or less per 1 mm 2 . Further, since it is not desirable from the viewpoint of productivity and cost that the length of time is excessively long, it is preferable to appropriately set it depending on the use condition of the gear to be treated.
【００３０】[0030]
【発明の効果】このように本発明により、歯車の歯面の
疲労強度を損なうことなく、歯底部の疲労強度を向上さ
せることができることから、総合的に歯車の疲労強度を
向上し、歯車の寿命延長及び伝達荷重の増大に寄与でき
る。しかも本発明によれば、限定した部分のみに硬球を
衝突させることができるので、例えば機械部分のネジ孔
周辺部やシャフトの応力集中部等に適応すれば、必要以
外の部分の品質及び性能を損なわずに歯車の疲労強度の
向上を企図し得る。As described above, according to the present invention, it is possible to improve the fatigue strength of the tooth bottom without impairing the fatigue strength of the tooth surface of the gear. It can contribute to extension of life and increase of transmission load. Moreover, according to the present invention, the hard sphere can be made to collide only with a limited portion, so that, for example, if it is applied to the screw hole peripheral portion of the machine portion or the stress concentration portion of the shaft, the quality and performance of the unnecessary portion can be improved. It is possible to try to improve the fatigue strength of the gear without impairing it.
【図１】本発明装置の概略構成図。FIG. 1 is a schematic configuration diagram of a device of the present invention.
【図２】噴射口とスリットと歯車との関係を示す説明
図。FIG. 2 is an explanatory diagram showing a relationship among an injection port, a slit, and a gear.
１ 硬球投射装置 ２ 硬球供給装置 ３ 噴射口 ４ スリット ５ 邪魔板 ６ 歯車 ６ａ 歯底部 ７ インデックス装置 1 Hard Sphere Projection Device 2 Hard Sphere Supply Device 3 Jet Port 4 Slit 5 Baffle Plate 6 Gear 6a Gear Bottom 7 Index Device
Claims (3)
圧縮残留応力を被処理歯車に付与するための歯車歯元の
残留応力付与装置であって、 硬球噴射口から前記被処理歯車の歯底部に至る硬球の弾
道上に配置され、かつ前記被処理歯車の歯底部に対する
投影寸法が使用する硬球径を超え前記被処理歯車の歯底
幅寸法以下のスリットを有する邪魔板と、 前記被処理歯車の歯底部の所定位置と前記スリットの中
心位置とを整合させるための位置制御手段とを有するこ
とを特徴とする歯車歯元の残留応力付与装置。1. A residual stress imparting device at a tooth root of a gear for imparting a compressive residual stress to a gear to be treated by colliding accelerated hard spheres, the device comprising: a hard sphere injection port to a tooth bottom portion of the gear to be treated. A baffle plate which is arranged on the trajectory of the hard sphere and has a slit whose projected dimension to the tooth bottom of the gear to be processed exceeds the diameter of the hard sphere to be used and is equal to or smaller than the bottom width dimension of the gear to be treated, and teeth of the gear to be treated. A residual stress imparting device for a tooth bottom of a gear, comprising: a position control means for aligning a predetermined position of a bottom portion with a central position of the slit.
板の端縁同士間に形成されるものであることを特徴とす
る請求項１に記載の歯車歯元の残留応力付与装置。2. The gear tooth residual stress imparting device according to claim 1, wherein the slit is formed between edges of a pair of plates facing each other.
記被処理歯車の歯底幅寸法の１／５以下であることを特
徴とする請求項１若しくは請求項２に記載の歯車歯元の
残留応力付与装置。3. The gear tooth root according to claim 1, wherein the position setting accuracy of the position control means is ⅕ or less of the bottom width of the gear to be processed. Residual stress applying device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35259392A JPH06172852A (en) | 1992-12-09 | 1992-12-09 | Residual stress imparting device for dedendum of gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35259392A JPH06172852A (en) | 1992-12-09 | 1992-12-09 | Residual stress imparting device for dedendum of gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06172852A true JPH06172852A (en) | 1994-06-21 |
Family
ID=18425111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35259392A Withdrawn JPH06172852A (en) | 1992-12-09 | 1992-12-09 | Residual stress imparting device for dedendum of gear |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06172852A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5911780A (en) * | 1995-07-13 | 1999-06-15 | Komatsu Ltd. | Gear shot peening method |
| DE102009016853A1 (en) | 2009-04-08 | 2010-10-14 | Bayer Materialscience Ag | Process for the preparation of diaryl or alkylaryl carbonates from dialkyl carbonates |
-
1992
- 1992-12-09 JP JP35259392A patent/JPH06172852A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5911780A (en) * | 1995-07-13 | 1999-06-15 | Komatsu Ltd. | Gear shot peening method |
| DE102009016853A1 (en) | 2009-04-08 | 2010-10-14 | Bayer Materialscience Ag | Process for the preparation of diaryl or alkylaryl carbonates from dialkyl carbonates |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000307 |