JPH0688135B2 - Manufacturing method of overlay valve for internal combustion engine - Google Patents
Manufacturing method of overlay valve for internal combustion engineInfo
- Publication number
- JPH0688135B2 JPH0688135B2 JP32616987A JP32616987A JPH0688135B2 JP H0688135 B2 JPH0688135 B2 JP H0688135B2 JP 32616987 A JP32616987 A JP 32616987A JP 32616987 A JP32616987 A JP 32616987A JP H0688135 B2 JPH0688135 B2 JP H0688135B2
- Authority
- JP
- Japan
- Prior art keywords
- overlay
- internal combustion
- combustion engine
- powder
- chromium carbide
- 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
- 238000002485 combustion reaction Methods 0.000 title claims description 13
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000000463 material Substances 0.000 claims description 39
- 229910045601 alloy Inorganic materials 0.000 claims description 26
- 239000000956 alloy Substances 0.000 claims description 26
- 238000003466 welding Methods 0.000 claims description 26
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 claims description 24
- 229910003470 tongbaite Inorganic materials 0.000 claims description 24
- 239000000843 powder Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 11
- 229910000684 Cobalt-chrome Inorganic materials 0.000 claims description 9
- 239000010952 cobalt-chrome Substances 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 description 10
- 229910001347 Stellite Inorganic materials 0.000 description 10
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 6
- 238000009826 distribution Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910000913 inconels 751 Inorganic materials 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
- LNSPFAOULBTYBI-UHFFFAOYSA-N [O].C#C Chemical group [O].C#C LNSPFAOULBTYBI-UHFFFAOYSA-N 0.000 description 2
- 239000010953 base metal Substances 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000005552 hardfacing Methods 0.000 description 1
- 229910000856 hastalloy Inorganic materials 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910001235 nimonic Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000010626 work up procedure Methods 0.000 description 1
Landscapes
- Coating By Spraying Or Casting (AREA)
- Laser Beam Processing (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は内燃機関用肉盛バルブの製造方法に関し、特に
内燃機関用エンジンバルブのフェース面又は軸端部に耐
摩耗性の優れた肉盛部を形成する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a built-up valve for an internal combustion engine, and more particularly to a built-up part having excellent wear resistance on a face surface or a shaft end portion of an engine valve for an internal combustion engine. Relates to a method of forming.
従来の技術 従来、SUH3、SUH36等のFe基耐熱鋼からなる内燃機関の
エンジンバルブのフェース面及び軸端部の耐摩耗性を確
保するために、Co基ステライト合金肉盛材、Ni基肉盛材
又はFe基肉盛材等の肉盛材を酸素−アセチレンガス溶
接、プラズマ粉末溶接法、レーザ粉末溶接法等により肉
盛溶接して耐摩耗性肉盛部を形成していた。しかしなが
ら、内燃機関の性能向上に伴い、エンジンバルブフェー
スの耐摩耗性について尚一層の向上が望まれており、特
に、ガスエンジンのように無潤滑状態で使用されるエン
ジンの場合、ステライト合金肉盛材による肉盛部では十
分な耐摩耗性を確保できなかった。従って、現在では、
トリバロイ合金（62Co−28Mo−8Cr−2Si）等の高硬度の
肉盛材を使用して、耐摩耗性を更に向上させている。Conventional technology Conventionally, in order to secure the wear resistance of the face surface and shaft end part of the engine valve of the internal combustion engine made of Fe-based heat-resistant steel such as SUH3 and SUH36, Co-based stellite alloy overlay material and Ni-based overlay material are used. A wear-resistant build-up portion was formed by build-up welding a material or a build-up material such as an Fe-based build-up material by oxygen-acetylene gas welding, plasma powder welding method, laser powder welding method, or the like. However, as the performance of the internal combustion engine is improved, further improvement in wear resistance of the engine valve face is desired. Especially, in the case of an engine used in a non-lubricated state such as a gas engine, a stellite alloy overlay is used. It was not possible to secure sufficient wear resistance in the built-up portion of the material. So now,
The wear resistance is further improved by using a hard facing material such as triballoy alloy (62Co-28Mo-8Cr-2Si).
また、内燃機関の高性能化及び高出力化に対応して、母
材についても従来のSUH36等の耐熱鋼に代わり、インコ
ネル751、ニモニック80A等のNi基超耐熱合金やNiの含有
量が20重量パーセントを超える超耐熱鋼が使用され始め
ている。このようなNi基超耐熱合金又は超耐熱鋼（以
下、単に超耐熱鋼という）からなる内燃機関用エンジン
バルブのフェース面及び軸端部の耐摩耗性を確保するた
めに、ステライト合金等の肉盛材をティグ溶接法により
肉盛して耐摩耗性肉盛部を形成していた。この場合、先
ずティグ溶接で肉盛部を形成した後これを0.2乃至0.4mm
程度の厚さに削り、次いでこの肉盛部の上にティグ溶接
又は酸素−アセチレンガスで再度ステライト合金を肉盛
溶接することによって、上記バルブ母材の溶込みを回避
して肉盛部の所要硬さを確保していた。In addition, in order to respond to higher performance and higher output of internal combustion engines, Ni-based super heat-resistant alloys such as Inconel 751 and Nimonic 80A and Ni content in the base material have been replaced with conventional heat resistant steels such as SUH36 and Ni content of 20. Super heat resistant steel in excess of weight percent is beginning to be used. In order to secure the wear resistance of the face surface and the shaft end portion of the engine valve for an internal combustion engine made of such Ni-base super heat-resistant alloy or super heat-resistant steel (hereinafter simply referred to as super heat-resistant steel), meat such as stellite alloy is used. The fill material was overlayed by the TIG welding method to form the wear-resistant overlay portion. In this case, first, the build-up portion is formed by TIG welding, and then this is 0.2 to 0.4 mm.
After cutting the valve base metal into a desired thickness by shaving to a certain thickness, and then overlay-welding a stellite alloy again on this overlay by TIG welding or oxygen-acetylene gas. The hardness was secured.
発明が解決しようとする問題点 このように、耐熱鋼からなるエンジンバルブの肉盛材と
してトリバロイ合金は高価であり、しかも肉盛時の湯流
れ性が悪いため製造不良率が高いという問題があった。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention As described above, there is a problem that a triballoy alloy is expensive as a cladding material for an engine valve made of heat-resistant steel and has a high manufacturing defect rate because of poor flowability of molten metal during cladding. It was
また、超耐熱鋼からなるエンジンバルブの肉盛溶接にお
いてティグ溶接法による二層盛り肉盛部を形成する場合
には、溶接温度が高いためステライト合金へバルブ母材
が溶け込み、肉盛部の硬度が低下して十分な耐摩耗性が
得られなかった。従って、第一層の肉盛部の削り加工を
要すること及びこの削り代に対応して肉盛材等の材料費
が増大することから、肉盛部の製造コストが高くなると
いう問題があった。Also, in the case of overlay welding of engine valves made of super heat-resistant steel, when forming a double-layer overlay by the TIG welding method, the valve base metal melts into the stellite alloy due to the high welding temperature and the hardness of the overlay is increased. Deteriorated, and sufficient abrasion resistance was not obtained. Therefore, there is a problem that the manufacturing cost of the build-up portion is increased because the work-up processing of the build-up portion of the first layer is required and the material cost of the build-up material or the like increases corresponding to this cutting allowance. .
そこで、本発明は、耐熱鋼又は超耐熱鋼からなる内燃機
関用エンジンバルブのフェース面又は軸端部に、安価で
且つ耐摩耗性、湯流れ性等の肉盛特性の優れた肉盛部を
形成する方法を提供することを目的とする。Therefore, the present invention provides an inexpensive build-up portion having excellent build-up characteristics such as wear resistance and hot water flowability on a face surface or a shaft end portion of an engine valve for an internal combustion engine made of heat-resistant steel or super heat-resistant steel. It is intended to provide a method of forming.
問題点を解決するための手段 本発明によれば、CoCr6、CoCr12又はCoCr32のようなCo
基合金肉盛材、Ni基肉盛材及びFe基肉盛材よりなる群か
ら選ばれた１つの粉末肉盛材に、３乃至50重量パーセン
トのクロムカーバイドの粉末を添加して肉盛溶接用合金
粉末を作り、内燃機関用エンジンバルブのフェース面及
び軸端部のうち少なくとも一方に、上記肉盛用合金粉末
を肉盛溶接することを特徴とする内燃機関用肉盛バルブ
の製造方法を提供する。According to the present invention, Co such as CoCr 6 , CoCr 12 or CoCr 32 is used.
For overlay welding by adding 3 to 50% by weight of chrome carbide powder to one powder overlay material selected from the group consisting of base alloy overlay material, Ni-based overlay material and Fe-based overlay material Provided is a method for manufacturing a build-up valve for an internal combustion engine, which comprises making an alloy powder and welding the build-up alloy powder to at least one of a face surface and a shaft end of the engine valve for an internal combustion engine. To do.
また、本発明の好ましい実施態様によれば、上記クロム
カーバイド粉末の粒径は、0.01乃至0.2mmである。Further, according to a preferred embodiment of the present invention, the particle size of the chromium carbide powder is 0.01 to 0.2 mm.
作用 Co基合金肉盛材、Ni基肉盛材又はFe基肉盛材に一定量の
クロムカーバイド（Cr3C2）粉末を添加してプラズマ粉
末溶接法等によって肉盛溶接するとき、肉盛溶接時の湯
流れ性が向上する。従って、所要溶接電流、即ち溶接温
度を低く設定することができ、特に超耐熱鋼からなる母
材の場合肉盛部へのバルブ母材の溶込みが減る。また一
般に、肉盛材の炭素及びクロムの濃度が増して肉盛部の
硬度が向上する。また未溶解のクロムカーバイドは肉盛
部に硬質粒子として残存するので耐摩耗性が一層向上す
る。Action When overlay welding is performed by plasma powder welding etc. by adding a certain amount of chromium carbide (Cr 3 C 2 ) powder to Co-based alloy overlay, Ni-based overlay or Fe-based overlay, The flowability of molten metal during welding is improved. Therefore, the required welding current, that is, the welding temperature can be set low, and in particular, in the case of the base material made of super heat-resistant steel, the penetration of the valve base material into the overlay is reduced. Further, generally, the carbon and chromium concentrations of the overlay material are increased to improve the hardness of the overlay portion. Further, the undissolved chromium carbide remains as hard particles in the built-up portion, so that the wear resistance is further improved.
クロムカーバイドの添加量は、３重量パーセント以下で
は上記硬化作用が十分でなく、50重量パーセント以上で
はクロムカーバイド粒子の残存量が多くなり、更に肉盛
部全体の製造コストを低減するのに逆効果となる。クロ
ムカーバイド粉末材料の大きさは、要求される肉盛特性
に応じて適宜選択されるが、一般的には0.2乃至0.01mm
の粒径のクロムカーバイドを任意に選定することができ
る。If the addition amount of chromium carbide is less than 3% by weight, the above curing effect is not sufficient, and if it is more than 50% by weight, the amount of remaining chromium carbide particles increases, which is an adverse effect for further reducing the manufacturing cost of the whole buildup part. Becomes The size of the chrome carbide powder material is appropriately selected according to the required overlay characteristics, but generally 0.2 to 0.01 mm.
It is possible to arbitrarily select chromium carbide having a particle size of.
添加したクロムカーバイドが肉盛部に与える影響は、そ
の添加量及びその粒径に依存する。粒径が0.1mm以上の
場合には５重量パーセント以上のクロムカーバイドを、
粒径が0.08乃至1.0mm以上の場合には20重量パーセント
以上のクロムカーバイドを添加すれば、未溶解のクロム
カーバイドが硬質粒子として残存するようになる。上記
添加量に満たなければ、マトリックスの共晶炭化物の増
加はあるが、硬質粒子としてクロムカーバイドが残存し
ない。従って、クロムカーバイドの添加量及び粒径を用
途に応じて選定し、肉盛部に所要の耐摩耗性を確保する
ことができる。The effect of the added chromium carbide on the build-up portion depends on the addition amount and the particle size. When the particle size is 0.1 mm or more, 5 weight percent or more of chromium carbide,
When the particle size is 0.08 to 1.0 mm or more, if 20% by weight or more of chromium carbide is added, undissolved chromium carbide will remain as hard particles. If the amount added is less than the above amount, the eutectic carbide in the matrix will increase, but chromium carbide will not remain as hard particles. Therefore, the amount of chromium carbide added and the particle size can be selected according to the application, and the required wear resistance can be secured in the build-up portion.
Co基合金肉盛材としてステライト合金♯６即ちCoCr6、
ステライト合金♯12即ちCoCr12及びステライト合金♯32
即ちCoCr32を、Ni基肉盛材としてハステロイ合金等を利
用することができる。Stellite alloy # 6, namely CoCr 6 , as a Co-based alloy overlay material,
Stellite alloy # 12 or CoCr 12 and Stellite alloy # 32
That is, CoCr 32 and a Hastelloy alloy or the like can be used as the Ni-based overlay material.
肉盛材にクロムカーバイド粉末を予め混合した肉盛溶接
用合金粉末を肉盛溶接してもよいし、あるいは、マルチ
ホッパにより肉盛材粉末とクロムカーバイド粉末の供給
量を制御しながら肉盛溶接を行ってもよい。The overlay welding alloy powder prepared by premixing the chrome carbide powder with the overlay material may be overlay welded, or the overlay welding while controlling the supply amount of the overlay powder and the chrome carbide powder by the multi hopper. You may go.
実施例１ Co基合金肉盛材の一種であるステライト♯６に100メッ
シュ乃至300メッシュのクロムカーバイド粉末材料を40
重量パーセント添加して、プラズマ肉盛法でSUH36から
なるバルブ母材に肉盛部を形成した。第１図は、本実施
例により形成した肉盛部の組織を示す顕微鏡写真であ
る。Example 1 40 mesh of 100 to 300 mesh chromium carbide powder was added to Stellite # 6, which is a kind of Co-based alloy overlay material.
By weight percent addition, a surfacing portion was formed on the valve base material made of SUH36 by the plasma surfacing method. FIG. 1 is a micrograph showing the structure of the built-up portion formed in this example.
ステライト♯６の硬さはHv（ビッカース硬さ）420乃至4
60であるが、形成した肉盛部のマトリックスの硬さはク
ロムカーバイドの添加によりHv550乃至650に上昇し、未
溶解のクロムカーバイドが面積率で20パーセント程度肉
盛部に残存した。図中の白い部分は残存したクロムカー
バイドであり、その硬さはHv1200であった。The hardness of Stellite # 6 is Hv (Vickers hardness) 420 to 4
Although it was 60, the hardness of the matrix of the built-up portion formed increased to Hv550 to 650 by the addition of chromium carbide, and undissolved chromium carbide remained in the built-up portion in an area ratio of about 20%. The white portion in the figure is the remaining chromium carbide, and its hardness is Hv1200.
実施例２ Fe基肉盛材（55Fe−11Ni−24Cr−5.5Mo）に100メッシュ
乃至300メッシュのクロムカーバイド粉末材料を40重量
パーセント添加して、プラズマ肉盛法によりSUH36から
なるバルブ母材に肉盛部を形成した。第２図は、本実施
例により形成した肉盛部の組織を示す顕微鏡写真であ
る。Example 2 An Fe-based overlay material (55Fe-11Ni-24Cr-5.5Mo) was added with 40 weight percent of 100 to 300 mesh chromium carbide powder material, and a valve base material composed of SUH36 was prepared by plasma overlaying. The raised portion was formed. FIG. 2 is a micrograph showing the structure of the built-up portion formed in this example.
上記Fe基肉盛材の硬さはHv400程度であるが、クロムカ
ーバイドの添加によりマトリックスの硬さはHv480乃至5
00に上昇し、未溶解のクロムカーバイドが面積率で20パ
ーセント程度肉盛部に残存した。実施例１と同様、図中
の白い部分は残存したクロムカーバイドであり、その硬
さはHv1200であった。The hardness of the Fe-based overlay material is about Hv400, but the hardness of the matrix is Hv480 to 5 due to the addition of chromium carbide.
It increased to 00, and undissolved chromium carbide remained in the build-up portion in an area ratio of about 20%. As in Example 1, the white portion in the figure was residual chromium carbide, and its hardness was Hv1200.
Ni基肉盛材については実施例を示さなかったが、上記実
施例１及び本実施例と同じ効果が期待できることは明ら
かである。Although no examples have been shown for the Ni-based overlay material, it is clear that the same effects as those of Example 1 and this Example can be expected.
実施例３ Co基合金肉盛材にクロムカーバイドを５重量パーセント
混入した肉盛用合金粉末をプラズマ粉末溶接法により肉
盛溶接して、インコネル751からなるバルブ母材のフェ
ース面に肉盛部を形成した。第３図は、このように形成
した肉盛部の硬度分布を示す概略図である。Example 3 An alloy powder for overlay welding, in which 5% by weight of chromium carbide was mixed in a Co-based alloy overlay material, was overlay welded by a plasma powder welding method to form an overlay portion on the face surface of a valve base material made of Inconel 751. Formed. FIG. 3 is a schematic diagram showing the hardness distribution of the built-up portion thus formed.
比較例として、Co基合金肉盛材を従来のティグ溶接法に
よる二層盛りにより同じくインコネル751からなるバル
ブ母材のフェースに肉盛部を形成した。第４図は、この
ように形成した肉盛部の硬度分布を示す概略図である。As a comparative example, a Co-based alloy overlay material was double-layered by the conventional TIG welding method to form a overlay portion on the face of a valve base material also made of Inconel 751. FIG. 4 is a schematic diagram showing the hardness distribution of the built-up portion thus formed.
以上、２つの硬度分布図を比較すると、クロムカーバイ
ドを５重量パーセント添加して本実施例で形成した肉盛
部は、従来のティグ溶接法による二層盛り肉盛部とほぼ
同じ硬度分布を有することがわかった。Comparing the two hardness distribution charts above, the build-up portion formed in this example by adding 5 weight percent of chromium carbide has almost the same hardness distribution as the double-layer build-up portion by the conventional TIG welding method. I understood it.
また、以上の実施例は、バルブのフェース面についての
実施例であるが、本発明を軸端部にも適用することがで
きることは明らかである。Further, although the above-mentioned embodiments are embodiments relating to the face surface of the valve, it is obvious that the present invention can be applied to the shaft end portion.
発明の効果 以上のように、本発明による内燃機関用肉盛バルブの製
造方法によれば、従来よりも安価に肉盛部を形成するこ
とができ、クロムカーバイドにより肉盛材の湯流れ性等
の肉盛特性が向上するので肉盛部の製造不良率も減少す
る。EFFECTS OF THE INVENTION As described above, according to the method for manufacturing a built-up valve for an internal combustion engine according to the present invention, the built-up portion can be formed at a lower cost than conventional ones, and the flowability of the built-up material can be improved by using chrome carbide. Since the surfacing property of is improved, the manufacturing defect rate of the surfacing part is also reduced.
第１図は、本発明の実施例１により形成した肉盛部の金
属組織を示す顕微鏡写真であり、 第２図は、本発明の実施例２により形成した肉盛部の金
属組織を示す顕微鏡写真である。 第３図は、本発明により形成した肉盛部の硬度分布を示
す概略図であり、 第４図は、従来のティグ溶接法により二層盛りで形成し
た肉盛部の硬度分布を示す概略図である。FIG. 1 is a micrograph showing a metal structure of a built-up portion formed according to Example 1 of the present invention, and FIG. 2 is a microscope showing a metal structure of a built-up portion formed according to Example 2 of the present invention. It is a photograph. FIG. 3 is a schematic view showing the hardness distribution of the built-up portion formed according to the present invention, and FIG. 4 is a schematic view showing the hardness distribution of the built-up portion formed of two layers by the conventional TIG welding method. Is.
Claims (2)
金肉盛材、Ni基肉盛材及びFe基肉盛材よりなる群から選
ばれた１つの粉末肉盛材に、３乃至50重量パーセントの
クロムカーバイドの粉末を添加して肉盛溶接用合金粉末
を作り、 内燃機関用エンジンバルブのフェース面及び軸端部のう
ち少なくとも一方に、上記肉盛用合金粉末を肉盛溶接す
ることを特徴とする内燃機関用肉盛バルブの製造方法。1. A powder overlay material selected from the group consisting of a Co-based alloy overlay material such as CoCr 6 , CoCr 12 or CoCr 32 , a Ni-based overlay material and an Fe-based overlay material. Add 50 to 50% by weight of chromium carbide powder to make an alloy powder for overlay welding, and overlay weld the above alloy powder for overlay onto at least one of the face surface and the shaft end of the engine valve for an internal combustion engine. A method for manufacturing a built-up valve for an internal combustion engine, comprising:
乃至0.2mmであることを特徴とする特許請求の範囲第
（１）項に記載の方法。2. The particle size of the chromium carbide powder is 0.01
Method according to claim (1), characterized in that it is between 0.2 mm and 0.2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32616987A JPH0688135B2 (en) | 1987-12-23 | 1987-12-23 | Manufacturing method of overlay valve for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32616987A JPH0688135B2 (en) | 1987-12-23 | 1987-12-23 | Manufacturing method of overlay valve for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01166885A JPH01166885A (en) | 1989-06-30 |
| JPH0688135B2 true JPH0688135B2 (en) | 1994-11-09 |
Family
ID=18184819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32616987A Expired - Lifetime JPH0688135B2 (en) | 1987-12-23 | 1987-12-23 | Manufacturing method of overlay valve for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0688135B2 (en) |
-
1987
- 1987-12-23 JP JP32616987A patent/JPH0688135B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01166885A (en) | 1989-06-30 |
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