JP2668714B2 - Gear manufacturing method - Google Patents
Gear manufacturing methodInfo
- Publication number
- JP2668714B2 JP2668714B2 JP63246182A JP24618288A JP2668714B2 JP 2668714 B2 JP2668714 B2 JP 2668714B2 JP 63246182 A JP63246182 A JP 63246182A JP 24618288 A JP24618288 A JP 24618288A JP 2668714 B2 JP2668714 B2 JP 2668714B2
- Authority
- JP
- Japan
- Prior art keywords
- tooth
- gear
- shot peening
- gear body
- cast iron
- 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
- Gear Processing (AREA)
Description
【発明の詳細な説明】 ［発明の目的］ （産業上の利用分野） この発明は例えば車両の変速機等で使用される歯車の
製造方法の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an improvement in a method of manufacturing a gear used for a transmission of a vehicle, for example.
（従来の技術） 一般に、自動車等の車両の変速機等の騒音対策として
現在多く使用されている浸炭歯車に代えてオーステンパ
・ダクタイル鋳鉄（球状黒鉛鋳鉄）製の歯車を実用化す
ることが考えられている。この種のオーステンパ・ダク
タイル鋳鉄歯車では浸炭歯車に比べて強度不足になる問
題があるので、歯車本体の歯面にショットピーニング処
理を施し、歯車本体の歯面の強度を高めるようにしてい
る。この場合、ショットピーニング処理は例えば0.7〜
0.9mm径程度の鋼球を40〜50m/sec程度の高速度で被加工
物表面に軽打させることにより、被加工物の表面層に著
しく大きい残留圧縮応力を発生させ、この被加工物表面
層に残留する大きい圧縮応力によって疲れ強さを増強さ
せるようにしたものである。(Prior Art) Generally, it is conceivable to put a gear made of austempered ductile cast iron (spheroidal graphite cast iron) into practical use in place of the carburized gear that is currently widely used as a noise countermeasure for transmissions of vehicles such as automobiles. ing. Since this type of austempered ductile cast iron gear has a problem of insufficient strength as compared with a carburized gear, the tooth surface of the gear body is shot peened to increase the strength of the tooth surface of the gear body. In this case, the shot peening process is, for example, 0.7-
By hitting a steel ball with a diameter of about 0.9 mm at a high speed of about 40 to 50 m / sec on the surface of the workpiece, a remarkably large residual compressive stress is generated in the surface layer of the workpiece, and The fatigue strength is enhanced by the large compressive stress remaining in the layer.
しかしながら、ショットピーニング処理を施した被加
工物は小鋼球の投射圧痕によて処理面全面に微小な凹凸
が形成されるので、オーステンパ・ダクタイル鋳鉄歯車
にショットピーニング処理を施した場合にはこのショッ
トピーニング処理面の鋳肌の荒れによって歯車の各歯部
の寸法精度が悪くなる問題があった。さらに、オーステ
ンパ・ダクタイル鋳鉄歯車のショットピーニング処理面
はピッチング強度が比較的低下し易いので、歯面の損傷
が発生し易い問題もあった。However, since the work piece that has been subjected to shot peening processing has minute irregularities formed on the entire processing surface due to the projection indentation of the small steel balls, when the shot peening processing is applied to the austempered ductile cast iron gear, this There has been a problem that the dimensional accuracy of each tooth portion of the gear deteriorates due to the roughness of the casting surface on the shot peened surface. Furthermore, the shot-peened surface of the austempered ductile cast iron gear has a relatively low pitching strength, so that the tooth surface is liable to be damaged.
（発明が解決しようとする課題） オーステンパ・ダクタイル鋳鉄歯車にショットピーニ
ング処理を施した場合にはこのショットピーニング処理
面の鋳肌の荒れによって歯車の寸法精度が悪くなる問題
があるとともに、オーステンパ・ダクタイル鋳鉄歯車の
ショットピーニング処理面はピッチング強度が比較的低
下し易く、歯面の損傷が発生し易い問題もあった。(Problems to be Solved by the Invention) When austempered ductile cast iron gears are subjected to shot peening, the dimensional accuracy of the gears deteriorates due to the roughening of the cast surface of the shot peened surface and the austempered ductile. The shot peened surface of the cast iron gear has a problem that the pitting strength is relatively easily reduced, and the tooth surface is likely to be damaged.
この発明は上記事情に着目してなされたもので、歯車
本体の寸法精度の向上を図ることができるとともに、歯
車本体の歯面の強度を高め、製造効率の向上、製造コス
トの低下を図ることができる歯車の製造方法を提供する
ことを目的とするものである。The present invention has been made in view of the above circumstances, and can improve the dimensional accuracy of the gear body, increase the strength of the tooth surface of the gear body, improve the manufacturing efficiency, and reduce the manufacturing cost. It is an object of the present invention to provide a method for manufacturing a gear that can achieve the above.
［発明の構成］ （課題を解決するための手段） この発明はオーステンパーダクタイル鋳鉄製の歯車本
体の歯部にショットピーニング処理を施したのち、この
歯車本体の歯の先端面近傍部位と歯底部との間の側面部
のみにハードフィニッシュ加工を施したことを特徴とす
る歯車の製造方法である。[Structure of the Invention] (Means for Solving the Problems) The present invention is a gear body made of austempered ductile cast iron, to which a tooth portion is subjected to shot peening treatment, and then the tooth body of the gear body is provided in the vicinity of a tip surface and a tooth bottom portion. And a method for manufacturing a gear characterized in that only a side portion between the two is hard-finished.
（作用） オーステンパーダクタイル鋳鉄製の歯車の製造方法に
関し、ショットピーニング処理により歯面の表面の強度
を増すと共に、ショットピーニング処理により凸凹にな
った表面を、ハードフィニッシュ加工により歯面精度を
向上する。さらに、歯車の製造で歯面精度が必要になる
のは、歯と歯が接触する側面部のみであり、この側面部
のみハードフィニッシュ加工することで、製造効率の向
上、製造コストの低下を図る。ここで、ハードフィニッ
シュ加工の目的は、あくまでも、ショットピーニング処
理により凸凹になった表面を削って滑らかにすることに
ある。つまり、オーステンパーダクタイル鋳鉄製の歯車
に対しては、ショットピーニング処理のみで歯面の表面
の強度は十分上がる。そのため、付加的な表面強度向上
策は必要なく、歯面の精度を上げることで十分である。
よって、本発明では歯の側面部のみのハードフィニッシ
ュ加工で十分なのである。(Function) Regarding a method of manufacturing a gear made of austempered ductile cast iron, the surface strength of the tooth surface is increased by the shot peening treatment, and the tooth surface accuracy is improved by the hard finish processing on the uneven surface by the shot peening treatment. . Further, only the side surfaces where the teeth are in contact with each other need to have the tooth surface accuracy in the manufacture of the gears. By performing hard finishing only on the side surfaces, the manufacturing efficiency is improved and the manufacturing cost is reduced. . Here, the purpose of the hard finish processing is merely to scrape and smooth the uneven surface by the shot peening processing. That is, for a gear made of austempered ductile cast iron, only the shot peening treatment sufficiently increases the strength of the tooth surface. Therefore, no additional measures for improving the surface strength are required, and it is sufficient to increase the accuracy of the tooth surface.
Therefore, in the present invention, it is sufficient to perform the hard finish processing only on the side surfaces of the teeth.
（実施例） 以下、この発明の一実施例を図面を参照して説明す
る。第１図はオーステンパ・ダクタイル鋳鉄（球状黒鉛
鋳鉄）製の平歯車の要部を示すもので、１は所定の平歯
車形状に成形された歯車素材の歯車本体、２はこの歯車
本体１の歯部である。この場合、歯車本体１の各歯部２
…は表面全体が平滑な鋳肌面３によって形成されてい
る。Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the essential parts of an austempered ductile cast iron (spheroidal graphite cast iron) spur gear, where 1 is a gear body of a gear material formed into a predetermined spur gear shape, and 2 is a tooth of the gear body 1. Department. In this case, each tooth portion 2 of the gear body 1
Is formed by a casting surface 3 having a smooth surface as a whole.
そして、この発明の歯車の製造方法を実施するにはま
ず、第１図に示す素材歯車の歯車本体１の各歯部２…に
ショットピーニング処理を施す。このショットピーニン
グ処理が施された歯車本体１は第２図に示すように各歯
部２…のショットピーニング処理時の小鋼球の投射圧痕
によって処理面全面に微小な凹凸が形成されたショット
ピーニング処理部４が形成される。この状態では歯車本
体１の各歯部２…の表面層に残留する大きい圧縮応力に
よって疲れ強さが増強されている。In order to carry out the method for manufacturing a gear according to the present invention, first, a shot peening process is performed on each tooth 2 of the gear body 1 of the material gear shown in FIG. As shown in FIG. 2, the shot-peened gear body 1 is formed by shot peening in which minute irregularities are formed on the entire processing surface by the projection indentation of a small steel ball at the time of shot peening of each tooth 2. A processing unit 4 is formed. In this state, the fatigue strength is enhanced by the large compressive stress remaining on the surface layer of each tooth portion 2 of the gear body 1.
また、このショットピーニング処理後、続いてこの歯
車本体１の各歯部２…の先端面５近傍部位と歯底部６と
の間の側面部７のみにハードフィニッシュ加工を施す。
この場合、ハードフィニッシュ加工は粉末状のCBN（cub
ic boron nitride）を超高圧下で焼結させたサーメッ
ト等のCBN工具を切削工具として使用して被加工物の表
面を切削加工させるものである。そして、このハードフ
ィニッシュ加工時には歯車本体１の各歯部２…の先端面
５近傍部位と歯底部６との間の側面部７のみがCBN工具
によって切削加工され、凹凸の少ないハードフィニッシ
ュ加工部８が形成される。したがって、ハードフィニッ
シュ加工の終了時には歯車本体１の各歯部２…の先端面
５近傍部位および歯底部６にショットピーニング処理部
４、歯車本体１の各歯部２…の先端面５近傍部位と歯底
部６との間の側面部７のみにハードフィニッシュ加工部
８がそれぞれ形成されることになる。After the shot peening process, only the side surface portion 7 between the portion near the tip end surface 5 of each tooth portion 2 of the gear body 1 and the tooth bottom portion 6 is subjected to hard finish processing.
In this case, the hard finish process is performed with powdered CBN (cub
The surface of a workpiece is cut using a CBN tool such as a cermet obtained by sintering ic boron nitride) under ultra-high pressure as a cutting tool. At the time of this hard finishing, only the side surface portion 7 between the vicinity of the tip end surface 5 of each tooth portion 2 of the gear body 1 and the tooth bottom 6 is cut by the CBN tool, and the hard finishing portion 8 with less unevenness is formed. Is formed. Therefore, at the end of the hard finish processing, the shot peening processing section 4 is provided at the vicinity of the distal end face 5 of each tooth 2 of the gear body 1 and the tooth bottom 6 at the vicinity of the distal end face 5 of each tooth 2 of the gear body 1. The hard finishing portions 8 are formed only on the side portions 7 between the tooth bottom portions 6.
そこで、上記方法にあってはショットピーニング処理
を施した歯車本体１の各歯部２…の先端面５近傍部位と
歯底部６との間の側面部７のみにハードフィニッシュ加
工を施すようにしたので、歯車本体１の各歯部２…の先
端面５近傍部位および歯底部６のショットピーニング処
理部４を残してこれらの部分の強度を高めた状態で保持
させることができる。さらに、ハードフィニッシュ加工
によって歯車本体１の歯の先端面５近傍部位と歯底部６
との間の側面部７の寸法精度を向上させることができる
とともに、ピッチング強度の向上を図ることができ、歯
車本体１の歯面の強度を高めることができる。Therefore, in the above method, the hard finish processing is applied only to the side surface portion 7 between the tooth bottom portion 6 and the portion in the vicinity of the tip end surface 5 of each tooth portion 2 of the gear body 1 subjected to the shot peening treatment. Therefore, the portions of the gear body 1 near the tip end surface 5 of each tooth portion 2 and the shot peening processing portion 4 of the tooth bottom portion 6 are left, and the strength of these portions can be maintained. Further, by hard finishing, a portion near the tip end face 5 of the tooth of the gear body 1 and the tooth bottom 6
In addition to improving the dimensional accuracy of the side surface portion 7 between them, the pitching strength can be improved, and the strength of the tooth surface of the gear body 1 can be increased.
なお、この発明は上記実施例に限定されるものではな
く、この発明の要旨を逸脱しない範囲で種々変形実施で
きることは勿論である。It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.
［発明の効果］ この発明によればオーステンパーダクタイル鋳鉄製の
歯車の製造方法に関し、ショットピーニング処理により
歯面の表面の強度を増すと共に、ショットピーニング処
理により凸凹になった表面を、ハードフィニッシュ加工
により歯面精度を向上する。さらに、歯面精度が必要に
なるのは、歯と歯が接触する側面部のみであり、この側
面部のみハードフィニッシュ加工することで、製造効率
の向上、製造コストの低下を図ることができる。[Effects of the Invention] According to the present invention, a method of manufacturing a gear made of austempered ductile iron is provided, in which the strength of the tooth surface is increased by shot peening, and the surface that is uneven by shot peening is hard-finished. Improves tooth surface accuracy. Further, the tooth surface accuracy is required only on the side surface portions where the teeth are in contact with each other. By performing hard finish processing only on these side surface portions, it is possible to improve the manufacturing efficiency and reduce the manufacturing cost.
図面はこの発明の一実施例を示すもので、第１図はショ
ットピーニング処理前の歯車を示す要部の平面図、第２
図はショットピーニング処理後の歯車を示す要部の平面
図、第３図はハードフィニッシュ加工後の歯車を示す要
部の平面図である。 １……歯車本体、２……歯部、４……ショットピーニン
グ処理部、５……先端面、６……歯底部、７……側面
部、８……ハードフィニッシュ加工部。1 shows an embodiment of the present invention. FIG. 1 is a plan view of a main part showing a gear before a shot peening process, and FIG.
FIG. 3 is a plan view of a main part showing the gear after the shot peening process, and FIG. 3 is a plan view of a main part showing the gear after the hard finish processing. 1 ... Gear main body, 2 ... Tooth portion, 4 ... Shot peening processing portion, 5 ... Tip surface, 6 ... Tooth bottom portion, 7 ... Side portion, 8 ... Hard finish processing portion.
Claims (1)
体の歯部にショットピーニング処理を施したのち、この
歯車本体の歯の先端面近傍部位と歯底部との間の側面部
のみにハードフィニッシュ加工を施したことを特徴とす
る歯車の製造方法。1. A tooth body of an austempered ductile cast iron gear body is subjected to shot peening treatment, and then a hard finish is applied only to the side surface portion between the tooth tip vicinity portion and the tooth bottom portion of the gear body. A method for manufacturing a gear, characterized by being applied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63246182A JP2668714B2 (en) | 1988-09-30 | 1988-09-30 | Gear manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63246182A JP2668714B2 (en) | 1988-09-30 | 1988-09-30 | Gear manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0295522A JPH0295522A (en) | 1990-04-06 |
| JP2668714B2 true JP2668714B2 (en) | 1997-10-27 |
Family
ID=17144732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63246182A Expired - Lifetime JP2668714B2 (en) | 1988-09-30 | 1988-09-30 | Gear manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2668714B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106363376A (en) * | 2016-10-26 | 2017-02-01 | 陕西省机械研究院 | Preparation method of CBN electroplated honing wheel for automobile transmission gear |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01264727A (en) * | 1988-04-09 | 1989-10-23 | Toyota Motor Corp | Manufacture of high strength gear |
-
1988
- 1988-09-30 JP JP63246182A patent/JP2668714B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106363376A (en) * | 2016-10-26 | 2017-02-01 | 陕西省机械研究院 | Preparation method of CBN electroplated honing wheel for automobile transmission gear |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0295522A (en) | 1990-04-06 |
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