JPH083123B2 - Laser hardening method - Google Patents
Laser hardening methodInfo
- Publication number
- JPH083123B2 JPH083123B2 JP1261712A JP26171289A JPH083123B2 JP H083123 B2 JPH083123 B2 JP H083123B2 JP 1261712 A JP1261712 A JP 1261712A JP 26171289 A JP26171289 A JP 26171289A JP H083123 B2 JPH083123 B2 JP H083123B2
- Authority
- JP
- Japan
- Prior art keywords
- laser beam
- tooth
- laser
- recess
- irradiated
- 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.)
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Description
【発明の詳細な説明】 産業上の利用分野 この発明は、歯車やラックあるいはスプライン軸等の
ように表面に凹凸を有する鋼製品のレーザ焼入れ方法に
関するものである。Description: FIELD OF THE INVENTION The present invention relates to a laser hardening method for a steel product such as a gear, a rack, a spline shaft or the like having unevenness on its surface.
従来の技術 鋼製品の焼入れ方法として、レーザビームを照射して
行なうレーザ焼入れが従来より行なわれている。この従
来のレーザ焼入れ方法として例えば第５図に示す鋼製の
歯車の焼入れ方法の場合には、歯車２の表面、すなわち
歯先部2aと歯底部2bの表面に、凸レンズ１によって集光
させたレーザビームＬを、その光軸上でかつ焦点Ｆより
外側（凸レンズ１から離れた側）において照射して焼入
れを行なっているのが一般的である。2. Description of the Related Art Laser quenching by irradiating a laser beam has been conventionally performed as a quenching method for steel products. In the case of this conventional laser hardening method, for example, the method of hardening a steel gear shown in FIG. 5, the convex lens 1 is used to focus light on the surface of the gear 2, that is, the surface of the tooth tip 2a and the tooth bottom 2b. In general, the laser beam L is irradiated on the optical axis and outside the focus F (on the side away from the convex lens 1) to perform hardening.
また、レンズ等で集光したレーザビームＬのエネルギ
密度は、ビーム断面積が最小となる焦点Ｆにおいて最大
となり、焦点Ｆから離れるにしたがって次第に小さくな
ることが知られている。このことから、前述の従来のレ
ーザ焼入れ方法によると、歯車２の歯底部2bより歯先部
2aの方が焦点Ｆに近くなるため照射されるレーザビーム
Ｌのエネルギ密度も大きくなる。また、歯先部2aは外気
と接している部分が多いため、空気の断熱作用によって
加熱された際の自己冷却能力が低く、これに比べて歯底
部2bは歯車本体の中心部分に連続しているため、効率良
く周囲に熱伝達されるので自己冷却能力が高い。したが
って、この焼入れ方法のように、焦点Ｆの外側において
歯車２の表面にレーザビームＬを照射するときに、歯底
部2bに対して充分な焼入れを施そうとすると、照射され
るエネルギ密度の大きい歯先部2aの方が強く加熱される
とともに、歯先部2aの自己冷却能力が低いためこの歯先
部2aが過熱し、歯先部2aの角部が溶融してしまうという
問題があった。Further, it is known that the energy density of the laser beam L condensed by a lens or the like becomes maximum at the focus F where the beam cross-sectional area is minimum, and gradually decreases as the distance from the focus F increases. From this, according to the above-mentioned conventional laser hardening method, the tooth tip portion is more than the tooth bottom portion 2b of the gear 2.
Since 2a is closer to the focal point F, the energy density of the laser beam L irradiated is also increased. Further, since the tooth tip portion 2a has many portions which are in contact with the outside air, the self-cooling ability when heated by the heat insulating effect of air is low, and in comparison with this, the tooth bottom portion 2b is continuous with the central portion of the gear body. Therefore, the heat is efficiently transferred to the surroundings, and the self-cooling ability is high. Therefore, when the surface of the gear 2 is irradiated with the laser beam L outside the focal point F as in this quenching method, if sufficient quenching is applied to the tooth bottom portion 2b, the energy density to be irradiated is large. There is a problem that the tooth tip 2a is heated more strongly and the tooth tip 2a is overheated due to the low self-cooling ability of the tooth tip 2a, and the corners of the tooth tip 2a are melted. .
そこで、過熱による歯先部2aの角部が溶融して歯車２
の形が崩れるのを防止することを目的とした方法とし
て、例えば特開昭61−284519号公報に示されているレー
ザ焼入れ方法が提案されている。Therefore, the corner of the tooth tip 2a is melted by overheating and the gear 2
As a method aimed at preventing the shape of the laser from breaking, for example, a laser hardening method disclosed in JP-A-61-284519 has been proposed.
この方法は第６図に示すように、内歯車12の歯先部12
aと歯底部12bの各表面に、凸レンズ１によって集光した
レーザビームＬを照射して焼入れを行なう場合に、内歯
車12の歯先部12aの側面と歯底部12bとにレーザビーム吸
収剤13を予め塗布しておくものである。This method, as shown in FIG.
When the laser beam L focused by the convex lens 1 is applied to the respective surfaces of the a and the tooth bottom 12b for hardening, the laser beam absorbent 13 is applied to the side surface of the tooth tip 12a of the internal gear 12 and the tooth bottom 12b. Is applied in advance.
また、過熱による歯先部の溶融を防止する別の方法と
しては第７図に示す方法がある。Another method for preventing the tooth tip from melting due to overheating is shown in FIG.
これは、レーザビームＬをハーフミラー21を通過させ
て反射光と透過光とに２分するとともに、２分された各
レーザビームl,lをそれぞれ全反射ミラー23に反射させ
て、歯車22の歯側面22aと歯底面22bのみに照射して一歯
ずつ焼入れする方法である。また、これと似た方法とし
て、特開昭60−215715号公報に示されている方法があ
る。これは、楔形ミラー31を用いてレーザビームＬを２
分割するとともに、分割された各レーザビームl,lをそ
れぞれ全反射ミラー33に反射させるとともに、それぞれ
凸レンズ34によって集光させた後、ラック32の歯側面32
a,32aのみを照射するようにして一歯ずつ焼入れする方
法である。This is because the laser beam L passes through the half mirror 21 and is divided into reflected light and transmitted light, and the divided laser beams l and l are reflected by the total reflection mirror 23, respectively, and the laser beam L of the gear 22 is reflected. This is a method of irradiating only the tooth side surface 22a and the tooth bottom surface 22b to quench each tooth. Further, as a method similar to this, there is a method disclosed in JP-A-60-215715. This uses a wedge-shaped mirror 31 to convert the laser beam L into two.
After splitting, the split laser beams l, l are respectively reflected by the total reflection mirror 33 and are condensed by the convex lenses 34, respectively, and then the tooth side surfaces 32 of the rack 32 are divided.
This is a method of hardening only one tooth by irradiating only a and 32a.
発明が解決しようとする課題 しかし、前述の過熱による歯先部の溶融を防止した従
来のレーザ焼入れ方法のうち、レーザビーム吸収剤13を
用いる方法においては、レーザビームＬを照射すると、
レーザビーム吸収剤13が塗布されている内歯車12の歯先
部12aの側面と歯底部12bとが、他の塗布されていない部
分、すなわち冷却し難いことから、過熱し易い歯先部12
aの頂部より多くエネルギを吸収するため、歯先触12aと
歯底部12bとほぼ均等に加熱されて焼入れでき、歯先部1
2aの角部の溶融を防ぐことができるが、レーザビーム吸
収剤13の塗布は、歯先部12aの頂部をマスキングし、ス
プレーガン当にてにて塗布するか、歯先部12aの側面と
歯底部12bの部分だけを手塗りで行なわなければならな
いため作業性が悪く、量産には不向きである。However, in the conventional laser hardening method that prevents the melting of the tooth tip due to the above-mentioned overheating, in the method using the laser beam absorbent 13, when the laser beam L is irradiated,
The side surface of the tooth tip 12a of the internal gear 12 to which the laser beam absorbent 13 is applied and the tooth bottom 12b are other non-applied portions, that is, it is difficult to cool the tooth tip 12 that easily overheats.
Since it absorbs more energy than the top part of a, it can be heated and hardened almost evenly to the tip 12a and the bottom 12b, and the tip 1
Although it is possible to prevent melting of the corners of 2a, the application of the laser beam absorbent 13 is performed by masking the top of the tooth tip 12a and applying with a spray gun, or with the side surface of the tooth tip 12a. Since only the tooth bottom portion 12b has to be painted by hand, workability is poor and it is not suitable for mass production.
また、ハーフミラー21を用いる方法あるいは楔形ミラ
ー31を用いる方法においては、レーザビームＬをハーフ
ミラー21あるいは楔形ミラー31によって２分割した後、
分割した各レーザビームl,lを反射鏡23,33に反射させ、
また必要に応じて凸レンズ34により集光して、歯車22の
歯側面22aと歯底面22b、あるいはラック32の歯側面32a
に照射させて一歯ずつ焼入れするため、１ビーム当りの
エネルギ量が減少してしまい処理能力が低下するという
欠点があった。また複数のミラーを用いるため、レーザ
ビームl,lを所定の位置に照射するためには、各ミラー
の精密な角度調整が必要され、特に経由するミラーの数
が多い場合には、角度調整の精度が低いと小さな誤差が
増幅されて、レーザビームの狙いが外れてしまう等の不
都合が生じ易かった。また歯車22またはラック32の歯の
位置の割出しをその都度行なって一歯ずつ焼入れを行な
うため、割出し精度の確保が必要とされ、調整に手間が
かかり作業性が悪いという問題があった。In the method using the half mirror 21 or the method using the wedge mirror 31, after the laser beam L is divided into two by the half mirror 21 or the wedge mirror 31,
The divided laser beams l, l are reflected by the reflecting mirrors 23, 33,
If necessary, the light is condensed by the convex lens 34 to form the tooth side surface 22a and the tooth bottom surface 22b of the gear 22 or the tooth side surface 32a of the rack 32.
However, there is a drawback that the amount of energy per one beam is reduced and the processing capability is reduced because each of them is irradiated with the laser beam and hardened one by one. Also, since a plurality of mirrors are used, precise angle adjustment of each mirror is required in order to irradiate the laser beam l, l to a predetermined position. If the accuracy is low, a small error is amplified, and it is easy to cause inconveniences such as the laser beam being missed. Further, since the tooth positions of the gear 22 or the rack 32 are indexed each time and the teeth are hardened one by one, it is necessary to secure the indexing accuracy, and there is a problem that adjustment is troublesome and workability is poor. .
この発明は、上記した技術的背景の下に為されたもの
で、表面に凹凸を有する鋼製品で、周囲へ熱伝達され難
い、いわゆる自己冷却能力の低い凸部の部分的な過熱に
よる溶熱を防止し、凹部と凸部とをほぼ均一に焼入れで
きかつ作業性に優れたレーザ焼入れ方法を提供すること
を目的としている。The present invention has been made under the technical background described above, and is a steel product having unevenness on the surface, which is difficult to transfer heat to the surroundings, so-called melting heat due to partial overheating of the so-called convex portion with low self-cooling ability. It is an object of the present invention to provide a laser hardening method capable of preventing the above-mentioned problems, hardening the recesses and the projections substantially uniformly, and having excellent workability.
課題を解決するための手段 上記課題を解決するためにこの発明の方法は、凹部と
凸部とが交互に形成された鋼製品の表面にレーザビーム
を照射して行なうレーザ焼入れ方法において、レーザビ
ームを集光するレンズあるいはミラーと前記鋼製品との
相対距離を、その凹部の底面をレーザビームの焦点より
もレンズあるいはミラー側に位置させ、その凹部底面の
幅方向中央を照射した際の凹部底面でのレーザビーム直
径が凹部底面の幅寸法以下となり、かつこのときの前記
凹部の両側の各凸部の頂面間でのレーザビーム直径が、
この両頂面間での凹部の幅以下となる距離に設定し、こ
の相対距離を変化させずに鋼製品とレーザビームとを相
対移動させながら焼入れを行なうことを特徴としてい
る。Means for Solving the Problems In order to solve the above problems, the method of the present invention is a laser hardening method in which a laser beam is applied to the surface of a steel product in which concave portions and convex portions are alternately formed, and a laser beam is applied. The relative distance between the lens or mirror for condensing light and the steel product is such that the bottom of the recess is located closer to the lens or mirror than the focal point of the laser beam, and the bottom of the recess is irradiated when the center of the width of the recess is irradiated. The laser beam diameter at is less than or equal to the width dimension of the bottom surface of the concave portion, and the laser beam diameter between the top surfaces of the convex portions on both sides of the concave portion at this time is,
It is characterized in that it is set to a distance equal to or less than the width of the concave portion between the two top surfaces, and quenching is performed while the steel product and the laser beam are relatively moved without changing the relative distance.
作用 上記の方法によれば、凹凸を有する鋼製品の凹部の底
面には、集光させたレーザビームが、その焦点よりレン
ズあるいはミラー側に位置させ、その凹部底面の幅方向
中央を照射した際の凹部底面でのレーザビーム直径が凹
部底面の幅寸法以下となり、かつこのときの前記凹部の
両側の各凸部の頂面間でのレーザビーム直径が、この両
頂面間での凹部の幅以下となる距離に設定し、この状態
で凹部と凸部とが同時に照射されないようにしている。Action According to the above method, when the focused laser beam is positioned on the lens or mirror side of the focal point on the bottom surface of the concave portion of the steel product having irregularities, and when the widthwise center of the concave portion bottom surface is irradiated. The laser beam diameter at the bottom surface of the recess is less than or equal to the width of the bottom surface of the recess, and the laser beam diameter between the top surfaces of the projections on both sides of the recess at this time is the width of the recess between both top surfaces. The distance is set as follows so that the concave portion and the convex portion are not simultaneously irradiated in this state.
したがって鋼製品の低い部分、すなわちレーザビーム
の照射源またはレンズやミラーに対し凹となっている部
分には、エネルギ密度の高いレーザビームの焦点に近い
部分で照射される。そして、周囲へ熱伝達され難いため
過熱し易い、すなわち、照射源側に向けて凸となってい
部分には、レーザビームの焦点から離れた部分で照射さ
れることとなるので、エネルギ密度が小さくなる。その
ため、凹部底面のように低い部分に照射されるビーム部
分に比べて、凸部頂面のように高い部分にはレーザビー
ムのエネルギ密度の低い部分が照射されることとなり、
この冷え難い高い部分の過熱を防止するとともに、高い
部分と低い部分とがほぼ等しく過熱され、鋼製品の全体
がほぼ均一に焼入れされる。Therefore, a low portion of the steel product, that is, a portion that is concave with respect to the laser beam irradiation source or the lens or mirror is irradiated with a portion close to the focal point of the laser beam with high energy density. And since it is difficult to transfer heat to the surroundings, it is easy to overheat, that is, the part that is convex toward the irradiation source side is irradiated with the part away from the focus of the laser beam, so the energy density is small. Become. Therefore, as compared with the beam portion irradiated on the lower portion such as the bottom surface of the concave portion, the higher portion such as the top surface of the convex portion is irradiated with the portion with lower energy density of the laser beam,
In addition to preventing overheating of the high portion that is hard to cool, the high portion and the low portion are overheated almost equally, and the entire steel product is quenched almost uniformly.
実 施 例 以下、この発明のレーザ焼入れ方法を、スプライン軸
や歯車の焼入れに適用した実施例を第１図ないし第４図
に基づいて説明する。Example An example in which the laser hardening method of the present invention is applied to the hardening of a spline shaft or a gear will be described below with reference to FIGS. 1 to 4.
第１図および第２図はこの発明のレーザ焼入れ方法の
第１実施例を示すもので、スプライン軸41の表面にレー
ザビームＬを照射して過熱焼入れし、歯先部41aおよび
歯底部41bの表面に硬い変質層Ｔを形成する方法を示す
もので、第１図はスプライン軸41の歯底部41bを熱処理
している状態を示す概略説明図、第２図は同じく歯先部
41aを熱処理している状態を示す説明図である。FIGS. 1 and 2 show a first embodiment of the laser hardening method of the present invention. The surface of the spline shaft 41 is irradiated with a laser beam L for overheat hardening to remove the tooth tip portion 41a and the tooth bottom portion 41b. FIG. 1 shows a method for forming a hard deteriorated layer T on the surface. FIG. 1 is a schematic explanatory view showing a state in which a tooth bottom portion 41b of a spline shaft 41 is heat-treated, and FIG.
It is an explanatory view showing a state where 41a is heat-treated.
歯先部41aは、歯底部41bから一定の高さh1に形成され
た断面台形の突条で、歯底部41bに比べて自己冷却能力
が低いため、歯底部41bが適切に焼入れされるまで、同
じ条件でレーザビームＬを照射すると過熱して溶融し易
い。そのため、過熱して溶融させることなく、スプライ
ン軸41の歯先部41aと歯底部41bとを、ほぼ同等の処理深
さで表面変質層Ｔを形成させるためには、照射するレー
ザビームＬのエネルギ密度が、例えば、歯先部：歯底部
＝1:5となるようにする必要がある。The tooth tip part 41a is a ridge having a trapezoidal cross section formed at a constant height h 1 from the tooth bottom part 41b, and has a lower self-cooling ability than the tooth bottom part 41b, so that the tooth bottom part 41b is appropriately quenched. When the laser beam L is irradiated under the same conditions, it is easily heated and melted. Therefore, in order to form the surface-altered layer T at the treatment depths of the tooth tip portion 41a and the tooth bottom portion 41b of the spline shaft 41 with substantially the same processing depth without overheating and melting, the energy of the laser beam L to be irradiated is increased. The density needs to be, for example, tip part: bottom part = 1: 5.
そこで、スプライン軸41の歯丈h1に応じて、レーザビ
ームＬの歯底部41bの底部と歯先部41aの頂部とのそれぞ
れ同じ高さにおける断面積S1,S2の比が１対５となる凸
レンズ42を用いる。Therefore, depending on the tooth height h 1 of the spline shaft 41, the ratio of the cross-sectional areas S 1 and S 2 at the same height of the bottom of the tooth bottom 41b and the top of the tooth tip 41a of the laser beam L is 1: 5. Then, a convex lens 42 is used.
そして、スプライン軸41を、水平な軸を中心に回転可
能に支持するとともに、集光した際に、その焦点Ｆより
手前（凸レンズ41に近い側）において歯底部41bの底部
にレーザビームＬが照射されるように位置決めして凸レ
ンズ42を固定する。この状態において、レーザビームを
凹部底面の幅方向中央に照射した際の前記底面における
レーザビーム直径が、前記凹部底面の幅寸法より小さ
く、かつ凹部両側の両凸部の頂面間におけるレーザビー
ム直径が、両項面間の凹部の幅以下となるように設定し
て、このように凹部底面の幅方向中央に照射したレーザ
ビームが、凸部に同時に照射されないようになってい
る。そして前記スプライン軸41を時計方向に回転させな
がら焼入れを行なう。The spline shaft 41 is rotatably supported about a horizontal axis, and when focused, the laser beam L irradiates the bottom of the tooth bottom 41b in front of the focus F (on the side close to the convex lens 41). The convex lens 42 is fixed by positioning as described above. In this state, the laser beam diameter at the bottom surface when the laser beam is applied to the center of the recess bottom surface in the width direction is smaller than the width dimension of the recess bottom surface, and the laser beam diameter between the top surfaces of both projections on both sides of the recess. However, the width is set to be equal to or less than the width of the concave portion between both facets so that the laser beam applied to the widthwise center of the bottom surface of the concave portion is not applied to the convex portion at the same time. Then, quenching is performed while rotating the spline shaft 41 clockwise.
したがって、歯底部41bの底部は、焦点Ｆに近い部分
でエネルギ密度の高いレーザビームＬが照射されて、充
分な深さまで処理されて充分な厚さの表面変質層Ｔが形
成される（第１図参照）。そして、スプライン軸41が更
に回転すると、レーザビームＬの光路上に歯先部41aが
移動し、頂部にレーザビームＬが照射される。このと
き、焦点Ｆから歯先部41aの頂部までの距離が、焦点Ｆ
から歯底部41bの底部までの距離より大きく、しかも、
頂部に照射されるレーザビームＬのエネルギ密度が５分
の１となるようにしてあるため、自己冷却能力の低い歯
先部41aが過熱することはなく、歯底部41b等とほぼ同じ
深さまで処理されて、スプライン軸41の表面全体にほぼ
均一な表面変質層Ｔが形成される。Therefore, the bottom portion of the tooth bottom portion 41b is irradiated with the laser beam L having a high energy density in a portion close to the focal point F and processed to a sufficient depth to form a surface-altered layer T having a sufficient thickness (first). See figure). When the spline shaft 41 further rotates, the addendum portion 41a moves on the optical path of the laser beam L, and the top portion is irradiated with the laser beam L. At this time, the distance from the focus F to the top of the tooth tip 41a is
From the bottom of the tooth bottom 41b, and
Since the energy density of the laser beam L radiated to the top portion is set to 1/5, the tooth tip portion 41a having a low self-cooling ability is not overheated and processed to a depth almost equal to that of the tooth bottom portion 41b. As a result, a substantially uniform surface-altered layer T is formed on the entire surface of the spline shaft 41.
なお、レーザビームＬを集光させるのに用いる凸レン
ズとしては、第３図に示すスプライン軸51のように、歯
底部51bの底部から歯先部51aの頂部までの歯丈h2が小さ
い場合には、底部に照射されるレーザビームＬの断面積
S3と、頂部における同じく断面積とが所定の比率となる
ように、焦点距離の短かい凸レンズ52を用いる。したが
って、歯底部51bの中央に照射したレーザビームＬが、
歯先部51aに同時に照射されないようになっている。ま
た、第４図に示す歯車61のように、歯底部61bの底から
歯先部61aの頂部までの歯丈h3が大きい場合には、底部
に照射されるレーザビームＬの断面積S4と、頂部におけ
る同じく断面積とが所定の比率となるように、焦点距離
の長い凸レンズ62を用いる。したがって、この場合も、
歯底部51bの中央に照射したレーザビームＬが、歯先部6
1aへ同時に照射されないようになっている。The convex lens used to focus the laser beam L is used when the tooth length h 2 from the bottom of the tooth bottom 51b to the top of the tooth tip 51a is small, as in the spline shaft 51 shown in FIG. Is the cross-sectional area of the laser beam L irradiated on the bottom.
A convex lens 52 having a short focal length is used so that S 3 and the same cross-sectional area at the top have a predetermined ratio. Therefore, the laser beam L applied to the center of the tooth bottom portion 51b is
The tooth tips 51a are not simultaneously irradiated. When the tooth length h 3 from the bottom of the tooth bottom 61b to the top of the tooth top 61a is large as in the gear 61 shown in FIG. 4, the cross-sectional area S 4 of the laser beam L irradiated to the bottom is S 4. And a convex lens 62 having a long focal length is used so that the same cross-sectional area at the top has a predetermined ratio. Therefore, in this case as well,
The laser beam L irradiated to the center of the tooth bottom portion 51b is
It is designed so that 1a is not irradiated at the same time.
また、上記実施例においては凸レンズを用いてレーザ
ビームを集光させる場合について説明したが、凸レンズ
の代りに凹面鏡を使用しても、同様に実施することがで
きる。また、焼入れする鋼製品として、歯車やスプライ
ン軸等の凹凸の高低差が一定の部品の場合について説明
したが、高低差が一定でないものに対しても同様に実施
することができる。Further, in the above-mentioned embodiment, the case where the laser beam is condensed by using the convex lens has been described, but the same operation can be performed by using the concave mirror instead of the convex lens. Further, as the steel product to be quenched, the case where the height difference of the unevenness such as the gear and the spline shaft is constant has been described, but the same can be applied to the case where the height difference is not constant.
発明の効果 以上説明したように、この発明のレーザ焼入れ方法
は、凹部と凸部とが交互に形成された鋼製品の表面にレ
ーザビームを照射して行なうレーザ焼入れ方法におい
て、レーザビームを集光するレンズあるいはミラーと前
記鋼製品との相対距離を、その凹部の底面をレーザビー
ムの焦点よりもレンズあるいはミラー側に位置させ、そ
の凹部底面の幅方向中央を照射した際の凹部底面でのレ
ーザビーム直径が凹部底面の幅寸法以下となり、かつこ
のときの前記凹部の両側の各凸部の頂面間でのレーザビ
ーム直径が、この両頂面間での凹部の幅以下となる距離
に設定し、この相対距離を変化させずに鋼製品とレーザ
ビームとを相対移動させながら焼入れを行なうので、特
別な前処理や操作を必要とせずに、レンズもしくはミラ
ー側へ凸となっていて、周囲へ熱伝達され難い部分への
照射エネルギ密度を自動的に小さくでき、その結果、凸
となった部分の過熱による溶融を防止できるとともに、
優れた作業性を得ることができる。Effects of the Invention As described above, the laser hardening method of the present invention is a laser hardening method in which a laser beam is applied to the surface of a steel product in which concave portions and convex portions are alternately formed, and the laser beam is focused. The relative distance between the lens or mirror and the steel product is set such that the bottom surface of the recess is located closer to the lens or mirror than the focal point of the laser beam, and the laser at the bottom surface of the recess when the center of the recess bottom is irradiated in the width direction. The diameter of the beam is less than the width of the bottom of the recess, and the laser beam diameter between the tops of the projections on both sides of the recess is less than the width of the recess between the two tops. However, since quenching is performed while moving the steel product and the laser beam relative to each other without changing the relative distance, no special pretreatment or operation is required to form a convex surface on the lens or mirror side. However, it is possible to automatically reduce the irradiation energy density to the part where it is difficult to transfer heat to the surroundings, and as a result, it is possible to prevent melting due to overheating of the convex part,
Excellent workability can be obtained.
第１図ないし第４図はこの発明のレーザ焼入れ方法の実
施例を示すもので、第１図および第２図は第１実施例を
示し、第１図は歯底部を熱処理している状態を示す概略
説明図、第２図は歯先部41aを熱処理している状態を示
す説明図、第３図は歯先部が低い場合の第２実施例を示
す説明図、第４図は歯先部が高い場合の第３実施例を示
す説明図、第５図ないし第８図はレーザ焼入れ方法のそ
れぞれ別の従来例を示す説明図である。 41,51……スプライン軸、41a,51a……歯先部、41b,51b
……歯底部、42,52……凸レンズ、61……歯車、61a……
歯先部、61b……歯底部、62……凸レンズ、Ｆ……焦
点、Ｌ……レーザビーム、Ｔ……表面変質層。1 to 4 show an embodiment of the laser hardening method of the present invention. FIGS. 1 and 2 show the first embodiment, and FIG. 1 shows a state in which the tooth bottom is heat-treated. 2 is an explanatory view showing a state in which the tooth tip portion 41a is heat-treated, FIG. 3 is an explanatory view showing a second embodiment when the tooth tip portion is low, and FIG. 4 is a tooth tip. FIGS. 5 to 8 are explanatory views showing another conventional example of the laser hardening method when the portion is high, and FIGS. 41,51 …… Spline shaft, 41a, 51a …… Tooth tip, 41b, 51b
...... Bottom of tooth, 42,52 ...... Convex lens, 61 ...... Gear, 61a ......
Tooth tip portion, 61b ... Tooth bottom portion, 62 ... Convex lens, F ... Focus, L ... Laser beam, T ... Surface alteration layer.
Claims (1)
表面にレーザビームを照射して行なうレーザ焼入れ方法
において、レーザビームを集光するレンズあるいはミラ
ーと前記鋼製品との相対距離を、その凹部の底面をレー
ザビームの焦点よりもレンズあるいはミラー側に位置さ
せ、その凹部底面の幅方向中央を照射した際の凹部底面
でのレーザビーム直径が凹部底面の幅寸法以下となり、
かつこのときの前記凹部の両側の各凸部の頂面間でのレ
ーザビーム直径が、この両頂面間での凹部の幅以下とな
る距離に設定し、この相対距離を変化させずに鋼製品と
レーザビームとを相対移動させながら焼入れを行うこと
を特徴とするレーザ焼入れ方法。1. A laser quenching method in which a laser beam is applied to the surface of a steel product in which concave and convex portions are alternately formed, the relative distance between a lens or a mirror for converging the laser beam and the steel product. , The bottom surface of the recess is located on the lens or mirror side with respect to the focus of the laser beam, and the laser beam diameter at the bottom surface of the recess when irradiating the widthwise center of the bottom surface of the recess is equal to or less than the width dimension of the bottom surface of the recess,
And at this time, the laser beam diameter between the top surfaces of the respective convex portions on both sides of the concave portion is set to a distance equal to or less than the width of the concave portion between the both top surfaces, and the steel is formed without changing the relative distance. A laser hardening method, wherein hardening is performed while moving a product and a laser beam relative to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1261712A JPH083123B2 (en) | 1989-10-06 | 1989-10-06 | Laser hardening method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1261712A JPH083123B2 (en) | 1989-10-06 | 1989-10-06 | Laser hardening method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03122212A JPH03122212A (en) | 1991-05-24 |
| JPH083123B2 true JPH083123B2 (en) | 1996-01-17 |
Family
ID=17365660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1261712A Expired - Fee Related JPH083123B2 (en) | 1989-10-06 | 1989-10-06 | Laser hardening method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH083123B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102660668A (en) * | 2012-05-11 | 2012-09-12 | 中国第一汽车股份有限公司 | Laser quenching hardening method for tooth root of inner gear ring |
| MX344776B (en) * | 2012-09-06 | 2017-01-06 | Etxe-Tar S A | Method and system for laser hardening of a surface of a workpiece. |
| CN107980067A (en) | 2015-03-17 | 2018-05-01 | 爱科古恩A.I.E. | Method and system for heat treatment of sheet metal |
| JP6662635B2 (en) * | 2015-12-28 | 2020-03-11 | 株式会社Ｓｕｂａｒｕ | Gear heat treatment method and gear heat treatment apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56112415A (en) * | 1980-02-13 | 1981-09-04 | Toshiba Corp | Production of cam |
-
1989
- 1989-10-06 JP JP1261712A patent/JPH083123B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03122212A (en) | 1991-05-24 |
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