JPH0417658A - Wear resistant gear and its production - Google Patents
Wear resistant gear and its productionInfo
- Publication number
- JPH0417658A JPH0417658A JP11932890A JP11932890A JPH0417658A JP H0417658 A JPH0417658 A JP H0417658A JP 11932890 A JP11932890 A JP 11932890A JP 11932890 A JP11932890 A JP 11932890A JP H0417658 A JPH0417658 A JP H0417658A
- Authority
- JP
- Japan
- Prior art keywords
- base material
- gear
- treatment
- layer
- wear
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 239000000463 material Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000005229 chemical vapour deposition Methods 0.000 claims abstract description 7
- 238000000151 deposition Methods 0.000 claims description 2
- 238000010791 quenching Methods 0.000 claims description 2
- 230000000171 quenching effect Effects 0.000 claims description 2
- 238000005496 tempering Methods 0.000 claims description 2
- 238000005255 carburizing Methods 0.000 abstract description 8
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 229910000677 High-carbon steel Inorganic materials 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 20
- 238000010586 diagram Methods 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 229910003460 diamond Inorganic materials 0.000 description 3
- 239000010432 diamond Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Gears, Cams (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は耐摩耗性とともに面圧強度および耐食性の向上
を図った耐摩耗歯車およびその製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a wear-resistant gear that has improved wear resistance, surface pressure strength, and corrosion resistance, and a method for manufacturing the same.
（従来技術）
従来の耐摩耗歯車としては浸炭処理等により表面硬化さ
せ、耐摩耗性および耐強度性の向上を図ったものが知ら
れている。第５図の製造過程図に示すように歯切処理１
１にて高炭素鋼の歯車母材を歯切り加工し、浸炭処理１
２を施して母材表面に浸炭層を形成し、その後研削処理
１３にて所要の表面研削加工を行って耐摩耗歯車を得て
いる。(Prior Art) As conventional wear-resistant gears, gears whose surfaces are hardened by carburizing or the like to improve wear resistance and strength resistance are known. Gear cutting process 1 as shown in the manufacturing process diagram in Figure 5.
In step 1, the high carbon steel gear base material is gear-cut and carburized.
2 to form a carburized layer on the surface of the base material, and then a required surface grinding process is performed in grinding process 13 to obtain a wear-resistant gear.
（発明が解決しようとする課Ｒ）
上述のように従来の耐摩耗歯車は、浸炭処理により表面
硬化処理を行い、耐摩耗性、耐強度性を図っているが、
耐摩耗性についてみれば、近年、歯車伝達トルクの増大
に伴い従来の浸炭処理のみの耐摩耗歯車では、歯面の面
圧強度が不足し、使用中にピッチングやスコーリングな
ど損傷をこうむり易いという欠点があった。また浸炭処
理のみでは歯車表面は硬化されるものの、内部の強度、
特に歯元部分の強度が充分でなく、高トルクの歯車伝動
部に使用すると歯部の破損が起るという問題があった。(Problem R to be solved by the invention) As mentioned above, conventional wear-resistant gears undergo surface hardening treatment by carburizing to improve wear resistance and strength resistance.
In terms of wear resistance, as gear transmission torque has increased in recent years, conventional wear-resistant gears that are only carburized have insufficient surface pressure strength on their tooth surfaces, making them susceptible to damage such as pitting and scoring during use. There were drawbacks. In addition, although the gear surface is hardened by carburizing treatment alone, the internal strength
In particular, the strength of the root portion of the tooth is insufficient, and when used in a high-torque gear transmission part, there is a problem that the tooth portion may be damaged.
本発明は耐摩耗性とともに面圧強度に優れ、かつ母材内
部の硬度も向上し、併せて耐食性の向上も確保できる耐
摩耗歯車およびその製造方法を提供することにある。An object of the present invention is to provide a wear-resistant gear that has excellent wear resistance and surface pressure strength, improves the hardness inside the base material, and also ensures improved corrosion resistance, and a method for manufacturing the same.
（課題を解決するための手段）
本発明による耐摩耗歯車は、歯車母材の表面に浸炭層と
さらにその表面にＴｉＣ層とを形成して成るものである
。(Means for Solving the Problems) A wear-resistant gear according to the present invention is formed by forming a carburized layer on the surface of a gear base material and further forming a TiC layer on the surface.
また本発明による耐摩耗歯車は、浸炭処理された歯車母
材を化学蒸着法でＴｉを母材表面に析出させるとともに
該母材中のＣを拡散させてＴｉＣ層を該母材表面に生成
することによって製造される。Furthermore, the wear-resistant gear according to the present invention is produced by depositing Ti on the surface of the carburized gear base material using a chemical vapor deposition method and diffusing C in the base material to form a TiC layer on the surface of the base material. Manufactured by
（実施例）
次に、本発明を実施例について図面を参照して説明する
。(Example) Next, an example of the present invention will be described with reference to the drawings.
第１図は本発明の実施例による耐摩耗歯車の部分的な横
断面図である。Ｃ量が０．２％以上の高炭素鋼から成る
歯車母材１の表面に浸炭層（Ｃ量が０．６〜０．８％）
２が形成され、かつ浸炭層２の表面に５〜１０μｍのＴ
ｉＣ層３が形成されている。FIG. 1 is a partial cross-sectional view of a wear-resistant gear according to an embodiment of the present invention. A carburized layer (C content is 0.6 to 0.8%) is formed on the surface of the gear base material 1 made of high carbon steel with a C content of 0.2% or more.
2 is formed, and a T of 5 to 10 μm is formed on the surface of the carburized layer 2.
An iC layer 3 is formed.
なお、この場合、後述する方法により浸炭層２の拡散し
たＣと表面のＴｉとを反応させてＴｉＣ層を生成させで
ある。ＴｉＣは硬度がＨｖ３０００（ビッカース硬度）
と硬く、耐摩耗性に適している材料であり、前述の如＜
ＴｉＣの生成反応によってＴｉＣ層の密着性も高い。In this case, the diffused C of the carburized layer 2 is caused to react with Ti on the surface to form a TiC layer by a method described later. TiC has a hardness of Hv3000 (Vickers hardness)
It is a hard material suitable for wear resistance, and as mentioned above,
The adhesion of the TiC layer is also high due to the TiC production reaction.
第２図（ａ）は本発明による耐摩耗歯車の製造過程を示
したブロック図である。歯切処理１１にて高炭素鋼の歯
車母材を歯切り加工し、浸炭処理１２を施して母材表面
に浸炭層を形成し、その後研削処理１３にて所要の表面
研削加工を行うことは第５図の従来の場合と同じである
が、本発明ではこの後さらに化学蒸着法（ＣＶＤ）によ
るＴｉＣ処理１４を施す（約１０００°Ｃ）、ＴｉＣ処
理１４では前記ＣＶＤによりＴｉを母材の浸炭層表面に
析出させるとともに浸炭層内のＣを拡散させて表面のＴ
ｉと反応させ、第１図で説明したような５〜１０ｔＩｍ
のＴｉＣ層３を生成させる。このときの表面粗さはＲｍ
ａｘ＝３〜５μ程度となる。これで表面層の耐摩耗性が
確保されるが、ＴｉＣ処理１４においてはＴｉＣ層の境
界部にＣが移動拡散するため、局部的に、例えば歯元部
にＣ量の少ない部分ができ、フェライト層があられれて
この部分の強度が阻害されることがある。またＴｉＣ層
の圧縮残留応力、境界部の引張残留応力で剥離を起すな
ど境界部の強度が弱くなる。このためこの実施例ではＴ
ｉＣ処理１４に続いてＱＴ処理１５即ち焼入れ焼戻し処
理を施し、母材内部の硬度を上げ、歯面の耐摩耗性向上
とともに歯元部の耐強度性向上を図ることができる。な
お場合によって最後のＱＴ処理１５は省略してもよい、
またＱＴ処理１５の後にダイヤモンド砥石による研削処
理１７を施し、Ｒｍａｘ−０，６μにすると耐摩耗性は
倍程度増加する。さらに第２図℃）に示す実施例のよう
にＴｉＣ処理１４の前にダイヤモンド砥石による研削処
理１３ａを施し、さらにＱＴ処理１５の後にもう一度ダ
イヤモンド研削処理１７を施してＲ＋＋ａｘ ＝０．４
μにすると、耐摩耗性はさらに２割程度向上する。FIG. 2(a) is a block diagram showing the manufacturing process of the wear-resistant gear according to the present invention. In the gear cutting process 11, a gear base material made of high carbon steel is subjected to gear cutting, carburizing process 12 is performed to form a carburized layer on the surface of the base material, and then the required surface grinding process is performed in the grinding process 13. Although this is the same as the conventional case shown in FIG. 5, in the present invention, TiC treatment 14 is further performed by chemical vapor deposition (CVD) (approximately 1000°C). At the same time as precipitating on the surface of the carburized layer, carbon in the carburized layer is diffused to reduce the T of the surface.
5 to 10tIm as explained in Fig. 1.
A TiC layer 3 is generated. The surface roughness at this time is Rm
ax=approximately 3 to 5μ. This ensures the wear resistance of the surface layer, but in the TiC treatment 14, C moves and diffuses to the boundary of the TiC layer, so a region with a small amount of C is created locally, for example at the root of the tooth, and the ferrite The layer may crack and the strength of this area may be impaired. Moreover, the strength of the boundary part becomes weak, such as peeling due to the compressive residual stress of the TiC layer and the tensile residual stress of the boundary part. Therefore, in this embodiment, T
Following the iC treatment 14, QT treatment 15, that is, quenching and tempering treatment, is performed to increase the hardness inside the base material, thereby improving the wear resistance of the tooth surface and the strength resistance of the root portion. Note that the final QT process 15 may be omitted depending on the case.
Moreover, if a grinding process 17 using a diamond grindstone is performed after the QT process 15 and Rmax is set to -0.6μ, the wear resistance increases by about twice. Further, as in the example shown in FIG. 2 (°C), a grinding process 13a using a diamond grinding wheel is performed before the TiC process 14, and further, a diamond grinding process 17 is performed once again after the QT process 15, so that R++ax = 0.4
When μ is used, the wear resistance is further improved by about 20%.
第３図は本発明の他の実施例による製造過程を示したブ
ロック図である。この実施例では浸炭処理１２とＴｉＣ
処理１４の間に歯元部コーティング処理１６を加えてお
り、第４図の符号４で示すように母材１の歯元部５の表
面を耐熱材でコーティングし、後のＴｉＣ処理でこの部
分のＣの拡散移動を防止し、ＱＴ処理１５をより効果的
に行い得るようにしている。ＱＴ処理により硬度は３倍
以上に向上することが確かめられる。FIG. 3 is a block diagram showing a manufacturing process according to another embodiment of the present invention. In this example, carburizing treatment 12 and TiC
During the treatment 14, a tooth root coating treatment 16 is added, in which the surface of the tooth root 5 of the base material 1 is coated with a heat-resistant material, as shown by reference numeral 4 in FIG. This prevents the diffusion and movement of C, thereby making it possible to perform the QT treatment 15 more effectively. It is confirmed that the QT treatment improves the hardness by more than three times.
（発明の効果）
以上説明したように本発明によれば、従来の浸炭処理に
加えてＣＶＤによるＴｉＣ処理を行いＣの拡散を利用し
てＴｉと反応させＴｉＣ層を表面に生成させたので面圧
強度が増大し、耐摩耗性とともに耐強度性、耐食性の増
大した歯車が容易に得られる効果がある。(Effects of the Invention) As explained above, according to the present invention, in addition to the conventional carburizing treatment, TiC treatment by CVD is performed, and a TiC layer is generated on the surface by utilizing the diffusion of C and reacting with Ti, so that the surface is smooth. This has the effect of increasing compressive strength and making it easier to obtain gears with increased wear resistance, strength resistance, and corrosion resistance.
【図面の簡単な説明】
第１図は本発明の実施例による耐摩耗歯車の部分的な横
断面図、第２図（ａ）、（ｂ）は本発明による耐摩耗歯
車の製造過程を示したブロック図、第３図は本発明の他
の実施例の製造過程を示したプロンり図、第４図は第３
図に示す製造過程での歯車母材のコーティング状態を示
す部分的な断面図、第５図は従来の耐摩耗歯車の製造過
程を示すブロック図である。
１・・・歯車母材、２・・・浸炭層、３・・・ＴｉＣ層
、４・・・コーティング層、１１・・・歯切処理、１２
・・・浸炭処理、１３・・・研削処理、１４・・・Ｔｉ
Ｃ処理、１５・・・ＱＴ処理、１６・・・歯元部コーテ
ィング処理。
復代理人 弁理士 染 川 利 言
回（０）
第２図（ｂ）[Brief Description of the Drawings] Figure 1 is a partial cross-sectional view of a wear-resistant gear according to an embodiment of the present invention, and Figures 2 (a) and (b) show the manufacturing process of the wear-resistant gear according to the present invention. 3 is a block diagram showing the manufacturing process of another embodiment of the present invention, and FIG. 4 is a block diagram showing the manufacturing process of another embodiment of the present invention.
FIG. 5 is a partial cross-sectional view showing the coating state of the gear base material during the manufacturing process shown in the figure, and FIG. 5 is a block diagram showing the manufacturing process of a conventional wear-resistant gear. DESCRIPTION OF SYMBOLS 1... Gear base material, 2... Carburized layer, 3... TiC layer, 4... Coating layer, 11... Gear cutting treatment, 12
...Carburizing treatment, 13...Grinding treatment, 14...Ti
C treatment, 15...QT treatment, 16...dental coating treatment. Sub-Agent Patent Attorney Toshi Somekawa Words (0) Figure 2 (b)
Claims (3)
ｉＣ層とを形成したことを特徴とする耐摩耗歯車。(1). Carburized layer on the surface of gear base material and T on the surface
A wear-resistant gear characterized by forming an iC layer.
母材表面に析出させるとともに該母材中のＣを拡散させ
てＴｉＣ層を該母材表面に生成することを特徴とする耐
摩耗歯車の製造方法。(2). A wear-resistant gear characterized by depositing Ti on the surface of a carburized gear base material using a chemical vapor deposition method and diffusing C in the base material to form a TiC layer on the surface of the base material. Production method.
えて焼入れ焼戻し処理を行うことを特徴とする請求項第
２項に記載の耐摩耗歯車の製造方法。(3). 3. The method of manufacturing a wear-resistant gear according to claim 2, further comprising performing a quenching and tempering process in addition to the process of forming the TiC layer by the chemical vapor deposition method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11932890A JP2873334B2 (en) | 1990-05-09 | 1990-05-09 | Manufacturing method of wear-resistant gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11932890A JP2873334B2 (en) | 1990-05-09 | 1990-05-09 | Manufacturing method of wear-resistant gear |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0417658A true JPH0417658A (en) | 1992-01-22 |
| JP2873334B2 JP2873334B2 (en) | 1999-03-24 |
Family
ID=14758755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11932890A Expired - Lifetime JP2873334B2 (en) | 1990-05-09 | 1990-05-09 | Manufacturing method of wear-resistant gear |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2873334B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4834220B2 (en) * | 1998-11-14 | 2011-12-14 | エムテーウー・アエロ・エンジンズ・ゲーエムベーハー | Equipment for precision machining of rotationally symmetric parts |
| JP2017532510A (en) * | 2014-10-02 | 2017-11-02 | イートン コーポレーションＥａｔｏｎ Ｃｏｒｐｏｒａｔｉｏｎ | Gear tooth crowning arrangement |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5620649B2 (en) * | 2009-04-30 | 2014-11-05 | 株式会社フジコー | Method for forming high-hardness wear-resistant film |
-
1990
- 1990-05-09 JP JP11932890A patent/JP2873334B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4834220B2 (en) * | 1998-11-14 | 2011-12-14 | エムテーウー・アエロ・エンジンズ・ゲーエムベーハー | Equipment for precision machining of rotationally symmetric parts |
| JP2017532510A (en) * | 2014-10-02 | 2017-11-02 | イートン コーポレーションＥａｔｏｎ Ｃｏｒｐｏｒａｔｉｏｎ | Gear tooth crowning arrangement |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2873334B2 (en) | 1999-03-24 |
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