JPH05272526A - Connecting rod made of titanium alloy - Google Patents
Connecting rod made of titanium alloyInfo
- Publication number
- JPH05272526A JPH05272526A JP9724992A JP9724992A JPH05272526A JP H05272526 A JPH05272526 A JP H05272526A JP 9724992 A JP9724992 A JP 9724992A JP 9724992 A JP9724992 A JP 9724992A JP H05272526 A JPH05272526 A JP H05272526A
- Authority
- JP
- Japan
- Prior art keywords
- connecting rod
- titanium alloy
- carried out
- layer
- nitriding
- 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.)
- Pending
Links
Landscapes
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、窒化処理を施したチタ
ン合金製コネクテングロッドに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nitriding titanium alloy connecting rod.
【０００２】[0002]
【従来の技術】エンジンの駆動系の軽量化の一端とし
て、図４に示すようなコネクテングロッドのチタン合金
化が考えられている。しかし、チタンは高い摩擦係数と
低い摩擦抵抗を示すので、他の金属と接触する摺動部
ａ，ｂにおいて焼付を生じ易いという欠点がある。その
ため、コネクテングロッドの摺動部に対しては、ガス窒
化による表面処理をおこない、耐摩耗性を向上させてい
る。2. Description of the Related Art As one of ways to reduce the weight of an engine drive system, it has been considered to use a titanium alloy for a connecting rod as shown in FIG. However, since titanium has a high coefficient of friction and a low frictional resistance, it has a drawback that seizure is likely to occur in the sliding parts a and b that come into contact with other metals. Therefore, the sliding portion of the connecting rod is subjected to surface treatment by gas nitriding to improve wear resistance.
【０００３】[0003]
【発明が解決しようとする課題】このように従来はチタ
ン合金製のコネクテングロッド対して、ガス窒化処理を
施して摺動部の耐摩耗性を向上させているが、窒化処理
の際、表面に生成するＴｉＮ層には、微小な亀裂を多く
含むとともに、弾性率が高いため、窒化処理をしない製
品より低い応力で、亀裂が成長進展し、破損に到る場合
があった。As described above, conventionally, a titanium alloy connecting rod is subjected to a gas nitriding treatment to improve the wear resistance of the sliding portion. Since the TiN layer generated in 1 contains many fine cracks and has a high elastic modulus, the cracks may grow and develop with a lower stress than a product not subjected to the nitriding treatment, resulting in damage.
【０００４】本発明は前記事情に鑑みてなされたもの
で、前記問題点を解消したチタン合金製コネクテングロ
ッドを提供することを目的とする。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a titanium alloy connecting rod that solves the above problems.
【０００５】[0005]
【課題を解決するための手段】前記目的に添い、本発明
は窒化処理を施したチタン合金製コネクテングロッド表
面のＴｉＮ層を、所定の厚さ除去することによって、前
記課題を解消した。In order to solve the above problems, the present invention has solved the above problems by removing a predetermined thickness of the TiN layer on the surface of the connecting rod made of titanium alloy which has been subjected to the nitriding treatment.
【０００６】以下、本発明の実施例について詳細に説明
する。コネクテングロッドの材料に、たとえばアルミチ
タン合金Ｔｉ−６Ａｌ−４Ｖを用いる。このコネクテン
グロッドを処理時間を変えて、次の処理条件でガス窒化
処理を施した。 処理温度 ８５０℃ Ｎ2 圧 ０．１３ＭＰａ 処理時間 ５，１０，１５，２０ｈｒHereinafter, embodiments of the present invention will be described in detail. Aluminum titanium alloy Ti-6Al-4V, for example, is used as the material of the connecting rod. This connecting rod was subjected to gas nitriding treatment under the following treatment conditions while changing the treatment time. Treatment temperature 850 ° C. N 2 pressure 0.13 MPa Treatment time 5, 10, 15, 20 hr
【０００７】その結果、窒化層の深さと処理時間との関
係が図１に示すように得られた。図１から処理時間を１
５時間（ｈｒ）以上かけても窒化層の深さは殆ど増加し
ないことが判った。As a result, the relationship between the depth of the nitrided layer and the processing time was obtained as shown in FIG. 1 processing time from Figure 1
It was found that the depth of the nitride layer hardly increased even after 5 hours (hr) or more.
【０００８】次に前記条件で１５時間処理したものの窒
化層において、その表面からの深さと、硬度との関係を
図２に示すように得た。なお硬度は、硬度比で示し、こ
の硬度比は、ガス窒化処理を施したものの硬度（Ｈｖ）
とガス窒化処理を施さない同じ材質のチタン合金の硬度
（Ｈｖｏ）との比、即ちＨｖ／Ｈｖｏで表わした。Next, the relationship between the depth from the surface and the hardness of the nitride layer which had been treated under the above conditions for 15 hours was obtained as shown in FIG. The hardness is indicated by a hardness ratio, and the hardness ratio is the hardness (Hv) of the gas-nitrided product.
And the hardness (Hvo) of a titanium alloy of the same material not subjected to the gas nitriding treatment, that is, Hv / Hvo.
【０００９】図２から、明らかなように表面からの距離
が大きく（深く）なるにしたがって次第に硬度が低下す
るが、表面より約６０μｍまでは硬度の上昇が認められ
る。As is apparent from FIG. 2, the hardness gradually decreases as the distance from the surface becomes larger (deeper), but the hardness increases up to about 60 μm from the surface.
【００１０】また、ガス窒化処理時間に対するコネクテ
ングロッド表面に生成するＴｉＮ（窒化チタン）層の厚
さの変化が次のように得られた。 処理時間（ｈｒ） ４ １５ ＴｉＮ層の厚さ（μｍ） ２ ４ 即ち、ガス窒化処理を１５時間施したものは、前記のよ
うに窒化層の深さの限界がえられ、この場合のＴｉＮ層
の厚さは４μｍであることが判る。The change in the thickness of the TiN (titanium nitride) layer formed on the surface of the connecting rod with respect to the gas nitriding treatment time was obtained as follows. Treatment time (hr) 4 15 Thickness of TiN layer (μm) 2 4 That is, when the gas nitriding treatment was performed for 15 hours, the limit of the depth of the nitride layer was obtained as described above. It can be seen that the thickness is 4 μm.
【００１１】次に処理温度８５０℃、処理時間１５時間
で処理した前記チタン合金製コネクテングロッドと、本
発明に係る同様な条件で処理したチタン合金製コネクテ
ングロッドの表面を電解研磨により２，４，１０μｍの
厚さでそれぞ除去したものについて疲労試験を実施し
た。試験機はコネクテングロッドの大端部と小端部を固
定できるようにした引張圧縮試験機を用い、室温、大気
中で繰り返し速度約５７Ｈｚ、Ｒ＝０．５（即ち、負荷
１ｋｇ，５００ｇの交互繰り返し）の条件で試験を実施
した。その結果、得られた疲労限度曲線を図３に示す。
図中●印は前記条件で窒化処理を施したコネクテングロ
ッドを、○印は表面を電解研磨したものを示す。Next, the surface of the titanium alloy connecting rod treated at a treatment temperature of 850 ° C. for a treatment time of 15 hours and the surface of the titanium alloy connecting rod treated under the same conditions according to the present invention are electropolished to 2, Fatigue tests were carried out on the removed products having a thickness of 4, 10 μm. The tester is a tensile compression tester that can fix the big end and the small end of the connecting rod. At room temperature and atmospheric air, the repetition rate is about 57Hz, R = 0.5 (that is, load 1kg, 500g). The test was carried out under the condition of (alternate repetition). The fatigue limit curve obtained as a result is shown in FIG.
In the figure, ● indicates a connecting rod that has been subjected to the nitriding treatment under the above conditions, and ○ indicates that the surface is electrolytically polished.
【００１２】図から明らかなように、ガス窒化処理を１
５時間施した場合、表面にはＴｉＮ層が形成されている
が、そのコネクテングロッドの表面を厚さ２μｍ除去し
ても殆ど変化がないが、厚さ４〜１０μｍ除去した場合
に寿命が著しく向上することが判明した。そして図２か
らも、表面をその程度研磨して取り除いても硬度には殆
ど影響しないことが明らかである。As is apparent from the figure, the gas nitriding treatment
When applied for 5 hours, a TiN layer is formed on the surface, but there is almost no change even if the surface of the connecting rod is removed by a thickness of 2 μm, but when the thickness of 4 to 10 μm is removed, the service life is significantly longer It turned out to improve. Also from FIG. 2, it is clear that even if the surface is polished and removed to that extent, the hardness is hardly affected.
【００１３】[0013]
【発明の効果】本発明によれば、ガス窒化処理により耐
摩耗性を向上させたチタン合金製コネクテングロッドに
ついては、その硬度を低下させることなしに、疲労強度
を向上させ、その寿命を長くできる。すなわち、生成し
たＴｉＮ膜厚を測定し、そのＴｉＮ層の所定量を除去す
ることにより、ガス窒化処理条件に関係なく、疲労強度
を向上させることができる。According to the present invention, the titanium alloy connecting rod whose wear resistance is improved by the gas nitriding treatment is improved in fatigue strength and extended in life without lowering its hardness. it can. That is, the fatigue strength can be improved regardless of the gas nitriding conditions by measuring the generated TiN film thickness and removing a predetermined amount of the TiN layer.
【図１】ガス窒化処理における処理時間と窒化層の深さ
との関係を示す図である。FIG. 1 is a diagram showing a relationship between a processing time and a depth of a nitrided layer in a gas nitriding process.
【図２】ガス窒化処理された窒化材の断面上の硬度の分
布を示す図である。FIG. 2 is a diagram showing a hardness distribution on a cross section of a gas nitrided nitride material.
【図３】ガス窒化処理されたチタン合金製コネクテング
ロッドに本発明に係る処理を施したものと施さないもの
疲労限度曲線を示す図である。FIG. 3 is a diagram showing fatigue limit curves of gas-nitrided titanium alloy connecting rods with and without the treatment according to the present invention.
【図４】本発明に係る処理を施すコネクテングロッドの
説明図である。FIG. 4 is an explanatory diagram of a connecting rod that is subjected to a treatment according to the present invention.
Claims (2)
ングロッド表面のＴｉＮ層を、所定の厚さ除去してなる
チタン合金製コネクテングロッド。1. A titanium alloy connecting rod obtained by removing a predetermined thickness of a TiN layer on the surface of a titanium alloy connecting rod that has been subjected to a nitriding treatment.
クテングロッドの表面を４〜１０μｍの厚さで除去して
なる請求項１に記載のチタン合金製コネクテングロッ
ド。2. The titanium alloy connecting rod according to claim 1, wherein the surface of the titanium alloy connecting rod subjected to the nitriding treatment is removed to a thickness of 4 to 10 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9724992A JPH05272526A (en) | 1992-03-24 | 1992-03-24 | Connecting rod made of titanium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9724992A JPH05272526A (en) | 1992-03-24 | 1992-03-24 | Connecting rod made of titanium alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05272526A true JPH05272526A (en) | 1993-10-19 |
Family
ID=14187307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9724992A Pending JPH05272526A (en) | 1992-03-24 | 1992-03-24 | Connecting rod made of titanium alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05272526A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012023620A1 (en) | 2010-08-20 | 2012-02-23 | 日本発條株式会社 | High-strength titanium alloy member and process for production thereof |
| WO2012169304A1 (en) | 2011-06-09 | 2012-12-13 | 日本発條株式会社 | Titanium alloy member and production method therefor |
| CN103602946A (en) * | 2013-11-21 | 2014-02-26 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for improving abrasive resistance of surface of titanium alloy bearing pedestal |
| US10350681B2 (en) | 2011-06-07 | 2019-07-16 | Nhk Spring Co., Ltd. | Titanium alloy member and production method therefor |
-
1992
- 1992-03-24 JP JP9724992A patent/JPH05272526A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012023620A1 (en) | 2010-08-20 | 2012-02-23 | 日本発條株式会社 | High-strength titanium alloy member and process for production thereof |
| US10151019B2 (en) | 2010-08-20 | 2018-12-11 | Nhk Spring Co., Ltd. | High-strength titanium alloy member and production method for same |
| US10350681B2 (en) | 2011-06-07 | 2019-07-16 | Nhk Spring Co., Ltd. | Titanium alloy member and production method therefor |
| WO2012169304A1 (en) | 2011-06-09 | 2012-12-13 | 日本発條株式会社 | Titanium alloy member and production method therefor |
| US9920399B2 (en) | 2011-06-09 | 2018-03-20 | Nhk Spring Co., Ltd. | Titanium alloy member and production method therefor |
| CN103602946A (en) * | 2013-11-21 | 2014-02-26 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for improving abrasive resistance of surface of titanium alloy bearing pedestal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Farokhzadeh et al. | Fatigue improvement in low temperature plasma nitrided Ti–6Al–4V alloy | |
| JP2016083704A (en) | Method of manufacturing stainless steel product | |
| Jeong et al. | Effects of TiN and WC coating on the fatigue characteristics of dental implant | |
| Tokaji et al. | The effects of gas nitriding on fatigue behavior in titanium and titanium alloys | |
| CHIANG et al. | Influence of a tangential force on the fracture of two contacting elastic bodies | |
| JPH05272526A (en) | Connecting rod made of titanium alloy | |
| KR20010040948A (en) | Sliding-contact bearings | |
| KR101302051B1 (en) | Dining and/or serving cutlery made of ferritic stainless steel with a martensitic boundary layer | |
| Su et al. | Influence of single-and multilayer TiN films on the axial tension and fatigue performance of AISI 1045 steel | |
| JP3018804B2 (en) | Surface treatment method for titanium alloy members | |
| JP3998733B2 (en) | High spring resistance and fatigue resistance coil spring | |
| US5292596A (en) | Force-transmitting surfaces of titanium protected from pretting fatigue by a coating of Co-Ni-Fe | |
| Przybilla et al. | Growth stresses in the oxide scales on TiAl alloys at 800 and 900 C | |
| JP7448859B2 (en) | titanium material | |
| Roven et al. | Effects of texture on delamination behavior of a 8090-type Al Li alloy at cryogenic and room temperature | |
| JP3011490B2 (en) | Methods for improving corrosion resistance of stainless steel | |
| Jellison et al. | Sliding friction of copper alloys in vacuum | |
| JP2002371348A (en) | Method for improving fatigue characteristics of titanium alloy component, and titanium alloy component therewith | |
| RU2287146C1 (en) | Method for determining type of part processing | |
| JPS61170551A (en) | Surface treatment of metallic material and titanium alloy or the like | |
| Bhushan | Surface pretreatment of thin Inconel X-750 foils for improved coating adherence | |
| JPS6217168A (en) | Sliding contact member having self-lubricity | |
| FR2579997A1 (en) | Process for treating the surface of an object and object obtained by this process | |
| JPH0548296B2 (en) | ||
| Pape | Fretting fatigue damage accumulation and crack nucleation in high-strength steels |