JPS6293361A - Manufacture of surface hardened gear made of cast iron - Google Patents
Manufacture of surface hardened gear made of cast ironInfo
- Publication number
- JPS6293361A JPS6293361A JP60232817A JP23281785A JPS6293361A JP S6293361 A JPS6293361 A JP S6293361A JP 60232817 A JP60232817 A JP 60232817A JP 23281785 A JP23281785 A JP 23281785A JP S6293361 A JPS6293361 A JP S6293361A
- Authority
- JP
- Japan
- Prior art keywords
- gear
- cast iron
- treatment
- layer
- spheroidal graphite
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/18—After-treatment
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は表面強化を施した鋳鉄製歯車の製造方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method of manufacturing a cast iron gear with surface reinforcement.
（従来の技術）
球状、川船鋳鉄は鋼に比べて軽量口、つ安価であり、ま
た割振性能、機械加工性等に優れているため、各種機械
部品や構造材として広く使用されているが、疲労強度、
耐摩耗性及び耐ピツチング性等の点で問題があるため、
そのままでは歯車としての使用には適さない。(Prior art) Spheroidal and riverboat cast iron is lighter and cheaper than steel, and has excellent distribution performance and machinability, so it is widely used as various machine parts and structural materials. Fatigue strength,
Due to problems with wear resistance and pitting resistance,
As it is, it is not suitable for use as a gear.
このため、従来より浸炭、窒化、ショットピーニング、
溶射、表面レーザーアロイング法による表面の合金化等
の処理による疲労強度、耐摩耗性及び耐ピツチング性の
向上が試みられている。For this reason, conventional methods such as carburizing, nitriding, shot peening,
Attempts have been made to improve fatigue strength, wear resistance, and pitting resistance through treatments such as surface alloying by thermal spraying and surface laser alloying.
また、合衆国特許第４２２２７９３号においては、球状
黒鉛鋳鉄にオーステンパー処理を施した後、ショットピ
ーニングにより表面に４００００ｐｓ＋以」二、表面か
ら０．００６ないし０．０１５ｉ ｎ ｃ ｈ （０，
０１５ないし０．０３８ ｃ ｍ）の部分に１００００
ｐ ｓ ４以上の圧縮残留応力を生じさせることによ
り表面を強化して疲労強度を向上させる方法が提案され
ている。Further, in US Pat. No. 4,222,793, after austempering treatment is applied to spheroidal graphite cast iron, the surface is subjected to shot peening at a pressure of 40,000 ps or more, and from the surface to 0.006 to 0.015 inch h (0,
015 to 0.038 cm) 10000
A method has been proposed to strengthen the surface and improve fatigue strength by generating compressive residual stress of ps 4 or more.
（〈明が解決しようとする問題点）
しかしながら、浸炭、窒化、ショットピーニング、溶射
、合金化等による表面の強化は、歯車のような高い疲労
強度、耐摩耗性及び耐ピツチング性が要求される部品に
適用するには充分ではない。また、１−記の合衆国特許
第４２２２７９３号の方法についても、圧縮残留応力の
発生によっては耐摩耗性及び耐ピツチング性は得られな
いことから、歯車の？ｔ！Ｉ造に適用するには不十分で
ある。また、溶射により表面を耐摩耗性材料で被覆して
も、母材と被覆層とは単に機械的に接着しているだけで
あり、合金化されているのではないため剥離しやすく、
耐ピツチング性を向上させることはできない。また、表
面レーザーアロイング法による合金層の形成による強化
についても、充分な耐摩耗性及び耐疲労性を得るには至
っていない。従って、本発明は球状黒鉛鋳鉄の割振性能
及び機械加Ｔ性が４１＝かされ、しかも耐摩耗性、耐ピ
ツチング性及び疲労強度が著しく改善された球状黒船鋳
鉄製歯車の製造方法を提供することを目的とする。(<Problem that Ming is trying to solve) However, surface reinforcement by carburizing, nitriding, shot peening, thermal spraying, alloying, etc. requires high fatigue strength, wear resistance, and pitting resistance similar to that of gears. Not enough to apply to parts. Also, regarding the method of U.S. Pat. T! It is insufficient to apply to I-structures. In addition, even if the surface is coated with a wear-resistant material by thermal spraying, the base material and the coating layer are only mechanically bonded and not alloyed, so they easily peel off.
Pitting resistance cannot be improved. Furthermore, reinforcement by forming an alloy layer by surface laser alloying has not yet achieved sufficient wear resistance and fatigue resistance. Therefore, it is an object of the present invention to provide a method for manufacturing a gear made of spheroidal graphite cast iron, in which the allocation performance and machining T property of spheroidal graphite cast iron are improved by 41, and the wear resistance, pitting resistance, and fatigue strength are significantly improved. With the goal.
（問題点を解決するための手段）
上記の目的を達成するために、本発明の球状黒鉛鋳鉄製
歯！（（の製造方法は、球状焦参１１鋳鉄により歯車粗
形材を形成し、該粗形材にオーステンパー処理を施し、
ショットピーニング処理をし、そして耐摩耗性材料を溶
射して被覆層を形成した後、高周波加熱処理により十記
粗形材と被覆層との間に合金層を形成せしめることから
なる。(Means for Solving the Problems) In order to achieve the above object, the spheroidal graphite cast iron teeth of the present invention! (The manufacturing method for () is to form a gear rough shape from spherical Jiogin 11 cast iron, perform austempering treatment on the rough shape,
After performing shot peening treatment and spraying a wear-resistant material to form a coating layer, an alloy layer is formed between the rough shaped material and the coating layer by high-frequency heating treatment.
球状黒鉛鋳鉄としてはいかなる組成のものをも使用する
ことができ、歯車の用途によって要求される機械的強度
、機械加１−性等の条件にあわせて選択される。Any composition can be used as the spheroidal graphite cast iron, and it is selected according to the conditions such as mechanical strength and machinability required depending on the purpose of the gear.
ショットピーニング処理並びに耐摩耗性材料−１の被覆
及び高周波加熱処理は、各々少なくとも歯車の歯底面及
び歯元の面に施されるが、所望により歯先面及び歯末の
面に施してもよい。The shot peening treatment, the coating with wear-resistant material-1, and the high-frequency heating treatment are each performed on at least the tooth root surface and the root surface of the gear, but may be applied to the tooth tip surface and tooth root surface if desired. .
耐摩耗性材料としては、例えばＣｒ−Ｍ。Examples of wear-resistant materials include Cr-M.
鋼、ＴＩＮ等のように、耐摩耗性で且つ高強度であり、
球状黒鉛鋳鉄との間に合金層を形成しうるものを使用す
る。It has wear resistance and high strength like steel, TIN, etc.
Use a material that can form an alloy layer between it and the spheroidal graphite cast iron.
（作用）
上記の方法により製造された歯車は、耐摩耗性材料を溶
射した後、高周波加熱処理を施しているため、第３図に
示す３Ｌうに強化された表面の被ｆｆ１１２と球状焦鉛
鋳鉄ネ１１形材３が境弄面において相互拡散し、合金層
４が形成される。このため、被Ｉ′！層２と球状黒鉛鋳
鉄粗形材３との結合力が強化され、耐ピツチング性が得
られる。また、最外層には被覆層が残っているため、優
れた耐摩耗性及び疲労強度が得られる。従来例の表面レ
ザーアロイング法も合金層を形成するものであるが、こ
れは第４図に示すように最少）層が合金層５であるため
、本発明において達成されるような耐摩耗性及び疲労強
度は得られない。(Function) Since the gear manufactured by the above method is thermally sprayed with a wear-resistant material and then subjected to high-frequency heat treatment, the 3L-strengthened surface of the gear shown in Fig. 3 and the spheroidal pyrolead cast iron The cross-sections 11 and 3 interdiffuse at the interface to form an alloy layer 4. For this reason, the subject I′! The bonding force between the layer 2 and the spheroidal graphite cast iron rough shape material 3 is strengthened, and pitting resistance is obtained. Furthermore, since the outermost layer remains a coating layer, excellent wear resistance and fatigue strength can be obtained. The conventional surface laser alloying method also forms an alloy layer, but as shown in FIG. and fatigue strength cannot be obtained.
（実施例） 以下、実施例により本発明をさらに詳細に説明する。(Example) Hereinafter, the present invention will be explained in more detail with reference to Examples.
炭素： ３．７６市量％、ケイ素：２．４９重量％。Carbon: 3.76% by weight, silicon: 2.49% by weight.
マンガン： ０．２９重量％、リン： ０．１６重量％
。Manganese: 0.29% by weight, Phosphorus: 0.16% by weight
.
イオウ： ０．００４重量％、マグネシウム０．０４１
℃量％の組成からなる球状黒鉛鋳鉄を用いて第１図のよ
うな平歯車（Ｗ５０Ｔ／ Ｍリバースアイドラギヤ）１
を製造した。この平歯車に対して以下に示す処理を施し
た。処理Ａ）Ｂ）及びＣ）は従来例の処理方法であり、
Ｄ）は本発明の実施例による処理方法である。Sulfur: 0.004% by weight, magnesium 0.041
A spur gear (W50T/M reverse idler gear) 1 as shown in Fig. 1 is made using spheroidal graphite cast iron with a composition of
was manufactured. This spur gear was subjected to the following treatments. Processes A), B) and C) are conventional processing methods,
D) is a processing method according to an embodiment of the present invention.
Ａ） ９００℃で１時間加熱してオーエナイト化した後
、３００℃まで徐々に冷却する。A) After heating at 900°C for 1 hour to turn it into owenite, it is gradually cooled to 300°C.
Ｂ）Ａ）に示した方法でオーステンパー処理を施した後
、アークハイト０．４０及びカバレージ２００％の条件
下でショットピーニング処理を行なう。B) After performing austempering treatment by the method shown in A), shot peening treatment is performed under the conditions of arc height 0.40 and coverage 200%.
Ｃ）表面レーザーアロイング法により、第４図に示すよ
うに表面に合金層５を形成する。C) An alloy layer 5 is formed on the surface as shown in FIG. 4 by a surface laser alloying method.
Ｄ）Ｂ）に示した方法で処理した後、第２図にしめした
ように歯車の歯先面以外の歯面にＴＩＮを溶射して被覆
層２を形成し、その後高周波加熱処理によりＴｉＮ被覆
層２と歯車の粗形材３との間に拡散合金層４を形成させ
る。D) After processing according to the method shown in B), as shown in Fig. 2, TIN is thermally sprayed on the tooth surface other than the tooth tip surface to form a coating layer 2, and then a TiN coating is applied by high-frequency heating treatment. A diffusion alloy layer 4 is formed between the layer 2 and the rough profile 3 of the gear.
Ａ）、Ｒ）、Ｃ）及びＤ）の処理を施した製品について
摩耗試験及び１山曲げ疲労試験を行った。A wear test and a single bend fatigue test were conducted on the products treated in A), R), C) and D).
摩耗試験： ＬＦＷ （１，＋ｔｂｒ ｌ ｃａ ｔ
ｉ ｏｎＦｒｉｃｔｉｏｎ Ｗｅａｒ）試験機を用い
て、摩耗距離９５００ ｍ及び荷重１６０ｋｇで、Ａ）
、Ｂ）、Ｃ）及びＤ）の処理を施した各製品について摩
耗塑を測定した。結果を第５表に示す。Wear test: LFW (1,+tbr l cat
A) using a Friction Wear) testing machine, with a wear distance of 9500 m and a load of 160 kg.
Abrasion plasticity was measured for each product subjected to the treatments of , B), C) and D). The results are shown in Table 5.
１歯曲げ疲労試験： Ａ）、 ｒ３）、 Ｃ）及びＤ）
の処理を施した各製品の歯車の１歯を用いて疲労限度を
測定した。結果を第６図に示す。1 tooth bending fatigue test: A), r3), C) and D)
The fatigue limit was measured using one tooth of the gear of each product subjected to the treatment described above. The results are shown in Figure 6.
第５図及び第６図のグラフから明らかな、１−うに、本
発明の方法に、ｌニジ）処理した球状黒鉛鋳鉄で形成さ
れた歯車は、ｉｆ来の方法により）処理された歯車に比
べて著しく優れた耐摩耗性及び疲労限度をイ１する。It is clear from the graphs of FIGS. 5 and 6 that gears made of spheroidal graphite cast iron treated by the method of the present invention (if compared to gears treated by the conventional method) It has outstanding wear resistance and fatigue limit.
（発明の効果）
本発明の方メツ３により、球状黒鉛鋳鉄製歯車の耐摩耗
性、耐ピツチング性及び疲労限度を著しく改善すること
ができるため、球状黒鉛鋳鉄製歯車の実用化が可能とな
り、鋼製歯車に比べて軽量、安価、機械加工性及び割振
性能が良いなどの点で１憂れた歯車を製造することがで
きる。(Effects of the Invention) The gear 3 of the present invention can significantly improve the wear resistance, pitting resistance, and fatigue limit of spheroidal graphite cast iron gears, making it possible to put spheroidal graphite cast iron gears into practical use. It is possible to manufacture gears that are lighter, cheaper, have better machinability, and better allocation performance than steel gears.
第１図及び第２図は本発明の一実施例により製造される
歯車の断面図、第３図は第２図の一点鎖線で囲んだ部分
の拡大図、第４図は従来例の歯車の南面部の一部の断面
を表わす拡大図、第５図は摩耗試験の結果を表わすグラ
フ、第６図は１歯曲げ疲労試験の結果を表わすグラフで
ある。
１・・・球状黒鉛鋳鉄製歯車 ２・・・被覆層３・・・
球状黒鉛鋳鉄粗形材 ４・・・合金層特許出願人 ト
ヨタ自動車株式会社
第１図
第３図 第４図
第５図
第６図1 and 2 are cross-sectional views of a gear manufactured according to an embodiment of the present invention, FIG. 3 is an enlarged view of the part surrounded by the dashed line in FIG. 2, and FIG. 4 is a diagram of a conventional gear. FIG. 5 is a graph showing the results of the wear test, and FIG. 6 is a graph showing the results of the single-tooth bending fatigue test. 1... Spheroidal graphite cast iron gear 2... Covering layer 3...
Spheroidal graphite cast iron rough profile 4... Alloy layer Patent applicant Toyota Motor Corporation Figure 1 Figure 3 Figure 4 Figure 5 Figure 6
Claims (1)
ング処理をし、そして耐摩耗性材料を溶射して被覆層を
形成した後、高周波加熱処理により上記粗形材と被覆層
との間に合金層を形成せしめることからなる表面強化を
施した鋳鉄製歯車の製造方法。[Claims] After forming a gear rough shape from spheroidal graphite cast iron, subjecting the rough shape to austempering treatment, subjecting it to shot peening treatment, and then spraying a wear-resistant material to form a coating layer. A method for manufacturing a cast iron gear with surface reinforcement, which comprises forming an alloy layer between the rough shaped material and the coating layer by high-frequency heat treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60232817A JPS6293361A (en) | 1985-10-18 | 1985-10-18 | Manufacture of surface hardened gear made of cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60232817A JPS6293361A (en) | 1985-10-18 | 1985-10-18 | Manufacture of surface hardened gear made of cast iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6293361A true JPS6293361A (en) | 1987-04-28 |
Family
ID=16945238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60232817A Pending JPS6293361A (en) | 1985-10-18 | 1985-10-18 | Manufacture of surface hardened gear made of cast iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6293361A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000167483A (en) * | 1998-12-10 | 2000-06-20 | Tokyo Tekko Co Ltd | Waterproof coating method of reinforced joint made of casting |
| GB2461351A (en) * | 2007-12-24 | 2010-01-06 | Ahlmann Aco Severin | Process for Producing Components made from Austenitic-ferritic Cast Iron and such Components |
| EP3597917A1 (en) * | 2018-07-20 | 2020-01-22 | Hamilton Sundstrand Corporation | Shape memory alloy coating using additive manufacturing |
-
1985
- 1985-10-18 JP JP60232817A patent/JPS6293361A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000167483A (en) * | 1998-12-10 | 2000-06-20 | Tokyo Tekko Co Ltd | Waterproof coating method of reinforced joint made of casting |
| GB2461351A (en) * | 2007-12-24 | 2010-01-06 | Ahlmann Aco Severin | Process for Producing Components made from Austenitic-ferritic Cast Iron and such Components |
| EP3597917A1 (en) * | 2018-07-20 | 2020-01-22 | Hamilton Sundstrand Corporation | Shape memory alloy coating using additive manufacturing |
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