JP2001115808A - Hardening method of valve face part in engine valve - Google Patents
Hardening method of valve face part in engine valveInfo
- Publication number
- JP2001115808A JP2001115808A JP29804999A JP29804999A JP2001115808A JP 2001115808 A JP2001115808 A JP 2001115808A JP 29804999 A JP29804999 A JP 29804999A JP 29804999 A JP29804999 A JP 29804999A JP 2001115808 A JP2001115808 A JP 2001115808A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- valve face
- engine valve
- engine
- face portion
- 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
- Forging (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、エンジンバルブに
おける弁フェース部全体の硬度及び硬化深度をほぼ均一
としうるようにした弁フェース部の硬化方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of hardening a valve face in an engine valve so that the hardness and the hardening depth of the entire valve face can be made substantially uniform.
【０００２】[0002]
【従来の技術】内燃機関に用いられる吸・排気バルブの
弁フェース部は、バルブシートと繰り返し激しく衝接し
ながら気密性を保持する機能を有しており、優れた耐摩
耗性及び高温耐酸化腐食性等が要求される。特に、低質
の燃料が使用される舶用ディーゼルエンジン用の排気バ
ルブにおいては、燃焼残渣が、弁フェース部に食い込む
などして、圧痕が生じ、耐吹抜け性が低下することがあ
るため、高い硬度が要求される。2. Description of the Related Art A valve face of an intake / exhaust valve used in an internal combustion engine has a function of maintaining airtightness while repeatedly and violently contacting a valve seat, and has excellent wear resistance and high-temperature oxidation corrosion resistance. Sex is required. In particular, in exhaust valves for marine diesel engines that use low-quality fuel, combustion residues may bite into the valve face, causing indentations and reduced blow-through resistance. Required.
【０００３】このような要求を満たすため、通常、エン
ジンバルブの弁フェース部に、ステライト等のＣｏ基合
金やＮｉ基合金を肉盛りし、その部分を硬化させて、耐
摩耗性を向上させている。[0003] In order to satisfy such demands, normally, a Co-based alloy such as stellite or a Ni-based alloy is deposited on the valve face portion of an engine valve, and the portion is hardened to improve wear resistance. I have.
【０００４】[0004]
【発明が解決しようとする課題】上述した肉盛りによる
硬化方法では、バルブ基材と異なる組成の肉盛材を用い
るため、それらの組成や熱膨脹率の違いなどにより、肉
盛材が剥離したり、亀裂を生じさせたりすることがあ
る。In the above-mentioned hardening method using the overlay, since the overlay having a composition different from that of the valve substrate is used, the overlay may be peeled off due to a difference in the composition or the coefficient of thermal expansion. May cause cracks.
【０００５】また、Ｃｏ基の肉盛材は、希少元素である
Ｃｏを主成分としているため、舶用の大型のエンジンバ
ルブでは、その使用量が大となり、製品コストが増大す
る。[0005] In addition, since the Co-based cladding material contains Co, which is a rare element, as a main component, a large engine valve for a marine vessel uses a large amount of the valve, thereby increasing the product cost.
【０００６】この問題を解決する他の硬化方法として、
加工硬化により弁フェース部を硬化する方法がある。こ
れは、弁フェース部を、鍛造、プレス又はローラ等によ
り強圧して塑性変形させると、塑性すべりに対する変形
抵抗が増大して加工硬化を起こすことを利用して、弁フ
ェース部の硬度を高めるものである。As another curing method to solve this problem,
There is a method of hardening the valve face portion by work hardening. This is to increase the hardness of the valve face part by taking advantage of the fact that when the valve face part is plastically deformed by forcible, press or roller, etc., the deformation resistance against plastic slip increases and causes work hardening. It is.
【０００７】しかし、このような加工硬化による方法で
も、次のような問題がある。すなわち、加工率（塑性歪
量）と硬度とは密接な関係があり、加工率が大きい程硬
度は高まるが、その反対に靱性が低下して脆くなるとと
もに、加工性が悪化するため、加工率の設定範囲を最適
とする必要がある。また、加工率は、鍛造等を施す前の
弁フェース部の形状により決定されるため、その形状を
最適に設定しないと、弁フェース部の各位置での硬度や
硬化深度にばらつきが生じることとなる。このような硬
度にばらつきが生じると、弁フェース部は勿論のこと、
これが当接するバルブシートも偏摩耗を起こし、互いの
密着性が損なわれて、気密性を低下させることがある。However, such a work hardening method has the following problems. That is, there is a close relationship between the working ratio (the amount of plastic strain) and the hardness, and the higher the working ratio, the higher the hardness. However, on the contrary, the toughness decreases and the workability deteriorates. It is necessary to optimize the setting range of. In addition, since the processing rate is determined by the shape of the valve face portion before forging or the like, unless the shape is optimally set, the hardness and the depth of hardening at each position of the valve face portion may vary. Become. When such hardness variation occurs, not only the valve face portion, but also
The valve seat with which it comes into contact also causes uneven wear, which may impair the adhesiveness of each other and reduce the airtightness.
【０００８】本発明は、上記問題点に鑑みてなされたも
ので、弁フェース部全体の硬度及び硬化深度をほぼ均一
化させることにより、弁フェース部やバルブシートに偏
摩耗の生じるのを防止しうるようにした、エンジンバル
ブにおける弁フェース部の硬化方法を提供することを目
的としている。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is possible to prevent uneven wear on a valve face and a valve seat by making the hardness and hardening depth of the entire valve face substantially uniform. It is an object of the present invention to provide a method for hardening a valve face portion of an engine valve, the method being provided.
【０００９】[0009]
【課題を解決するための手段】本発明によると、上記課
題は、次のようにして解決される。 （１）耐熱鋼又は耐熱合金により形成された加工前のエ
ンジンバルブ中間品における弁フェース部となる傘部
に、加工後のエンジンバルブの弁フェース部における径
方向のほぼ中央部と対応する部分の上下方向の加工率が
最大をなすとともに、その部分から弁フェース部の内、
外周端に向かって漸次加工率が小となるようにした膨出
部を形成し、この膨出部を押圧して塑性変形させること
により、弁フェース部を加工硬化させる。According to the present invention, the above-mentioned problem is solved as follows. (1) An umbrella portion serving as a valve face portion of an engine valve intermediate product before processing formed of heat-resistant steel or a heat-resistant alloy, and a portion corresponding to a substantially central portion in the radial direction of the valve face portion of the engine valve after processing. The machining rate in the up and down direction is the maximum, and from that part of the valve face,
A bulging portion is formed so that the working ratio gradually decreases toward the outer peripheral end, and the bulging portion is pressed and plastically deformed, whereby the valve face portion is work-hardened.
【００１０】（２）上記(１)項において、膨出部の断面
形状を、弁フェース部の中央部に頂点を有する二等辺三
角形状とする。(2) In the above item (1), the cross-sectional shape of the bulging portion is an isosceles triangle having a vertex at the center of the valve face portion.
【００１１】（３）上記(１)または(２)項おいて、エン
ジンバルブ中間品を、加工しようとするエンジンバルブ
の傘部と補形をなすダイの型孔内に挿入し、傘部の端面
をパンチにより強圧して膨出部を塑性変形させる。(3) In the above item (1) or (2), the engine valve intermediate product is inserted into a die hole of a die which complements an umbrella portion of an engine valve to be machined. The end face is strongly pressed by a punch to plastically deform the bulging portion.
【００１２】（４）上記(１)〜(３)項のいずれかにおい
て、膨出部を塑性変形させたのち、時効処理を施す。(4) In any one of the above items (1) to (3), after the swollen portion is plastically deformed, an aging treatment is performed.
【００１３】[0013]
【発明の実施の形態】以下、本発明の一実施形態を、図
面に基づいて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.
【００１４】図１〜図５は、本発明の方法を工程順に示
す。図１は、本発明に適用される加工前の排気用のエン
ジンバルブ中間品（以下、バルブ中間品と略称する）
(１)の傘部(1a)側を示すもので、バルブ中間品(１)は、
例えばオーステナイト系の耐熱鋼（ＳＵＨ３７）、Ｎｉ
基の耐熱合金（ＮＣＦ８０Ａ、ＮＣＦ７５１）等により
形成され、溶体化処理が施されている。1 to 5 show the method of the present invention in the order of steps. FIG. 1 shows an engine valve intermediate product for exhaust before processing applied to the present invention (hereinafter, abbreviated as a valve intermediate product).
This shows the umbrella part (1a) side of (1), and the valve intermediate product (1) is
For example, austenitic heat-resistant steel (SUH37), Ni
It is formed of a base heat-resistant alloy (NCF80A, NCF751) or the like, and is subjected to a solution treatment.
【００１５】バルブ中間品(１)の形状は、傘部(1a)の下
端部であるマージン部(1b)の外径を、想像線で示す加工
後のエンジンバルブ(２)のマージン部(2a)の外径よりも
若干小径とするとともに、マージン部(1b)の上部の外周
面、すなわち加工後のエンジンバルブ(２)のテーパ状の
弁フェース部(2b)と対応する部分に、二等辺三角形状の
断面をなす上向きの膨出部(３)を形成してある。The shape of the valve intermediate product (1) is such that the outer diameter of the margin portion (1b), which is the lower end portion of the umbrella portion (1a), is indicated by an imaginary line and the margin portion (2a) of the processed engine valve (2) is drawn. ) Is slightly smaller than the outer diameter of the marginal portion (1b), that is, an isosceles part on the outer peripheral surface of the upper portion of the margin portion (1b), that is, the portion corresponding to the tapered valve face portion (2b) of the engine valve (2) after processing. An upward bulging portion (3) having a triangular cross section is formed.
【００１６】上記膨出部(３)は、この部分を塑性変形さ
せて上記テーパ状の弁フェース部(2b)とするためのもの
で、その加工率（加工前の膨出部(３)と加工後の弁フェ
ース部(2b)との上下方向の寸法差を、加工前の膨出部の
寸法で除して百分率で表わした値）、すなわち塑性歪量
は、図２に拡大して示すように、弁フェース部(2b)の径
方向のほぼ中央部の加工率(Ｌ1)が最大で、この部分か
ら弁フェース部(2b)の内、外周端部に向かって漸次加工
率が小さくなるようにするとともに、弁フェース部(2b)
の外周端部付近(Ｓ)における加工率が０となるように、
膨出部(３)の形状を設定してある。The bulging portion (3) is for plastically deforming this portion to form the tapered valve face portion (2b). The value of the vertical dimension difference from the valve face portion (2b) after processing divided by the dimension of the bulging portion before processing and expressed as a percentage), that is, the amount of plastic strain is shown enlarged in FIG. As described above, the processing rate (L 1 ) at the substantially central portion in the radial direction of the valve face portion (2b) is the largest, and the processing rate gradually decreases from this portion toward the outer peripheral end of the valve face portion (2b). And the valve face (2b)
So that the processing rate near the outer peripheral end of (S) becomes 0
The shape of the bulging portion (3) is set.
【００１７】本実施形態においては、弁フェース部(2b)
の中央部の加工率(Ｌ1)を３０〜６０％、同じく内周端
部の加工率(Ｌ2)を５〜１０％の範囲に設定してある。In this embodiment, the valve face (2b)
The processing rate (L 1 ) at the center is set in the range of 30 to 60%, and the processing rate (L 2 ) at the inner peripheral end is set in the range of 5 to 10%.
【００１８】上記形状のバルブ中間品(１)を、常温又は
所定の温度（オーステナイト系の耐熱鋼では、５００〜
６５０℃、Ｎｉ基耐熱合金では、５３０〜６２０℃）に
加熱したのち、図３に略示する鍛造装置におけるダイ
(４)の型孔(4a)内に、傘部(1a)を上向きとして垂直に挿
入する。なおダイ(４)の型孔(4a)は、加工しようとする
上記エンジンバルブ(２)の傘部と補形をなす形状として
ある。(５)は、型孔(4a)内に向かって、予め定めたスト
ロークだけ上下動するパンチである。The valve intermediate product (1) having the above-mentioned shape is placed at room temperature or at a predetermined temperature (for austenitic heat-resistant steel, 500 to
650 ° C., 530-620 ° C. for a Ni-base heat-resistant alloy), and then a die in a forging device schematically shown in FIG.
The umbrella part (1a) is inserted vertically into the mold hole (4a) of (4). The die hole (4a) of the die (4) has a shape complementary to the head of the engine valve (2) to be machined. (5) is a punch that moves up and down by a predetermined stroke toward the inside of the mold hole (4a).
【００１９】バルブ中間品(１)をダイ(４)の型孔(4a)に
挿入したのち、図４に示すように、パンチ(５)を下降さ
せてバルブ中間品(１)を鍛造すると、後加工を殆ど必要
としない上述のようなエンジンバルブ(２)が得られる。After inserting the valve intermediate product (1) into the die hole (4a) of the die (4), as shown in FIG. 4, the punch (5) is lowered to forge the valve intermediate product (1). An engine valve (2) as described above which requires little post-processing is obtained.
【００２０】この鍛造時において、バルブ中間品(１)の
膨出部(３)は、図５に拡大して示すように、最大の加工
率とした中央部を中心として、矢印で示す内、外周部の
方向にほぼ均等に塑性変形させながら、傘部(1a)のマー
ジン部(1b)を、拡径方向に塑性変形させる。At the time of this forging, the bulging portion (3) of the valve intermediate product (1) has, as shown in an enlarged view in FIG. The margin portion (1b) of the umbrella portion (1a) is plastically deformed in the radially expanding direction while being plastically deformed almost uniformly in the direction of the outer peripheral portion.
【００２１】その結果、図６に示すように、加工後のエ
ンジンバルブ(２)の弁フェース部(2b)全体が、ほぼ一定
の硬化深度をもって均一に加工硬化され、弁フェース部
(2b)全体の硬度がほぼ均一化することにより、偏摩耗等
の生じにくい耐摩耗性に優れるエンジンバルブ(２)が得
られるのである。As a result, as shown in FIG. 6, the entire valve face portion (2b) of the engine valve (2) after processing is uniformly hardened with a substantially constant hardening depth.
(2b) By making the overall hardness substantially uniform, an engine valve (2) which is less likely to cause uneven wear and has excellent wear resistance can be obtained.
【００２２】本願の発明者らは、Ｎｉ基耐熱合金である
ＮＣＦ８０Ａを用い、上記膨出部(３)の中央部の加工率
(Ｌ1)を約４５％、外周端部付近(Ｓ)の加工率を０、内
周端部の加工率(Ｌ2)を約７％となるように設定し、上
述の要領で鍛造処理を施した。The inventors of the present application used NCF80A, which is a Ni-based heat-resistant alloy, and worked at the center of the bulging portion (3).
(L 1 ) is set to about 45%, the processing rate near the outer peripheral end (S) is set to 0, and the processing rate (L 2 ) at the inner peripheral end is set to about 7%. Was given.
【００２３】この製品について測定した結果、弁フェー
ス部(2b)の表面のビッカース硬度は、何れの測定点にお
いても、４７０〜４８０ＨVの範囲内にあり、大きなば
らつきが生じないことが実証された。なお、この硬度
は、同一素材で単にエンジンバルブを成形した際の弁フ
ェース部の硬度が３５０ＨV程度であるため、舶用ディ
ーゼルエンジン等の排気バルブとして用いた際でも、十
分な耐摩耗性が得られる。The Vickers hardness of the surface of the result of measurement for this product, the valve face portion (2b) is in any of the measurement points, in the range of 470～480H V, large variations can not occur was demonstrated . Note that this hardness, simply because the hardness of the valve face portion at the time of molding the engine valve is about 350H V the same material, even when used as an exhaust valve, such as a marine diesel engine, sufficient abrasion resistance is obtained Can be
【００２４】また、硬化深度についても、弁フェース部
(2b)の表面から約５mmまでの深さの硬度が、いずれの測
定点でも４００ＨV以上あり、その誤差が小さいことを
確認している。Further, regarding the curing depth, the valve face portion
Hardness from the surface to about 5mm depth of (2b) is located above 400H V at any measuring point, it was confirmed that the error is small.
【００２５】上記鍛造後のエンジンバルブ(２)に、時効
処理（例えば７００℃×１０hr・空冷）を施し、弁フェ
ース部(2b)の硬度をより高めるようにしてもよい。この
ような時効処理を施すと、弁フェース部(2b)の表面のビ
ッカース硬度は５５０ＨＶ程度まで高まる。The forged engine valve (2) may be subjected to an aging treatment (for example, 700 ° C. × 10 hours / air cooling) to further increase the hardness of the valve face (2b). When such aging treatment is performed, the Vickers hardness of the surface of the valve face (2b) increases to about 550HV.
【００２６】上記実施形態においては、バルブ中間品
(１)の膨出部(３)を塑性変形させて加工硬化させる手段
として、鍛造装置を用いているが、押圧力をそれ程必要
としない小型のエンジンバルブにおいては、ローラによ
り、内径側から外径側にしごくように押圧して、膨出部
(３)を塑性変形させてもよい。In the above embodiment, the valve intermediate product
A forging device is used as a means for plastically deforming and swelling the bulged portion (1) of (1). However, in a small engine valve that does not require much pressing force, a roller is used to move the bulged portion (3) from the inner diameter side to the outer side. Press gently on the radial side to
(3) may be plastically deformed.
【００２７】また、大型のエンジンバルブにおいては、
バルブ中間品(１)を垂直軸回りに緩速で回転させなが
ら、鍛造装置のハンマ等により、膨出部(３)を鉛直方向
に複数回圧縮し、全周を複数に分けて順次塑性変形させ
るようにしてもよい。このようにすると、圧縮能力の大
きな大型の鍛造装置を設置する必要はなくなる。In a large engine valve,
While rotating the valve intermediate product (1) slowly around the vertical axis, the bulging part (3) is compressed multiple times in the vertical direction by a hammer of a forging device, etc. You may make it do. In this case, there is no need to install a large forging device having a large compression capacity.
【００２８】[0028]
【発明の効果】請求項１記載の発明によれば、弁フェー
ス部全体が、硬度及び硬化深度に大きなばらつきが生じ
ることなく加工硬化されるので、弁フェース部や、これ
が当接するバルブシートの偏摩耗が防止され、長期間に
亘って気密性が保持される。According to the first aspect of the present invention, the entire valve face portion is work-hardened without a large variation in hardness and hardening depth, so that the valve face portion and the valve seat with which it comes into contact are biased. Wear is prevented and airtightness is maintained for a long period.
【００２９】請求項２記載の発明によれば、膨出部が
内、外周部に向かってほぼ均等に塑性変形するようにな
るので、弁フェース部全体の硬度や硬化深度はほぼ均一
化する。According to the second aspect of the present invention, since the bulging portion is plastically deformed almost uniformly toward the inner and outer peripheral portions, the hardness and the depth of hardening of the entire valve face portion are made substantially uniform.
【００３０】請求項３記載の発明によれば、ダイの型孔
内において塑性変形させられるので、弁フェース部を含
めた傘部の形状は一定となり、殆ど後加工を施す必要が
なくなる。According to the third aspect of the present invention, since the plastic deformation is performed in the die hole of the die, the shape of the umbrella portion including the valve face portion becomes constant, and almost no post-processing is required.
【００３１】請求項４記載の発明によれば、弁フェース
部の硬度をより高めることができる。According to the fourth aspect of the invention, the hardness of the valve face can be further increased.
【図１】本発明の一実施形態に用いられるエンジンバル
ブ中間品の傘部側の正面図である。FIG. 1 is a front view of an intermediate part of an engine valve used in one embodiment of the present invention, on the umbrella part side.
【図２】同じく、エンジンバルブ中間品の膨出部の形状
の詳細を示す要部の一部切欠正面図である。FIG. 2 is a partially cutaway front view of a main part, similarly showing details of a shape of a bulging portion of an engine valve intermediate product.
【図３】同じく、膨出部を塑性変形させるべく、バルブ
中間品をダイの型孔に挿入した状態を示す縦断正面図で
ある。FIG. 3 is a longitudinal sectional front view showing a state in which a valve intermediate product is inserted into a die hole of a die in order to plastically deform the bulging portion.
【図４】同じく、パンチを下降させて膨出部を塑性変形
させた状態の縦断正面図である。FIG. 4 is also a longitudinal sectional front view showing a state in which the swelling portion is plastically deformed by lowering the punch.
【図５】同じく、鍛造時の膨出部の塑性変形状態を矢印
で示す要部の拡大断面図である。FIG. 5 is an enlarged cross-sectional view of a main part, similarly indicated by an arrow, showing a plastic deformation state of a bulging portion during forging.
【図６】同じく、加工後の弁フェース部の硬化深度の状
態を示す説明図である。FIG. 6 is an explanatory view showing a state of a cured depth of a valve face portion after processing.
(１)エンジンバルブ中間品 (1a)傘部 (1b)マージン部 (２)エンジンバルブ (2a)マージン部 (2b)弁フェース部 (３)膨出部 (４)ダイ (4a)型孔 (５)パンチ (1) Engine valve intermediate product (1a) Head (1b) Margin (2) Engine valve (2a) Margin (2b) Valve face (3) Swelling (4) Die (4a) Mold hole (5 )punch
Claims (4)
工前のエンジンバルブ中間品における弁フェース部とな
る傘部に、加工後のエンジンバルブの弁フェース部にお
ける径方向のほぼ中央部と対応する部分の上下方向の加
工率が最大をなすとともに、その部分から弁フェース部
の内、外周端に向かって漸次加工率が小となるようにし
た膨出部を形成し、この膨出部を押圧して塑性変形させ
ることにより、弁フェース部を加工硬化させることを特
徴とするエンジンバルブにおける弁フェース部の硬化方
法。1. An umbrella portion serving as a valve face portion of an unprocessed engine valve intermediate product formed of heat-resistant steel or a heat-resistant alloy corresponds to a substantially central portion in a radial direction of the valve face portion of the processed engine valve. A bulging portion is formed so that the working ratio in the vertical direction of the portion becomes maximum and the working ratio gradually decreases from the portion toward the outer peripheral end of the valve face portion, and the bulging portion is pressed. A valve face portion in an engine valve, wherein the valve face portion is work-hardened by plastic deformation.
央部に頂点を有する二等辺三角形状としたことを特徴と
する請求項１記載のエンジンバルブにおける弁フェース
部の硬化方法。2. The method for curing a valve face portion of an engine valve according to claim 1, wherein a cross-sectional shape of the bulging portion is an isosceles triangle having a vertex at a central portion of the valve face portion.
するエンジンバルブの傘部と補形をなすダイの型孔内に
挿入し、傘部の端面をパンチにより強圧して膨出部を塑
性変形させることを特徴とする請求項１または２記載の
エンジンバルブにおける弁フェース部の硬化方法。3. An engine valve intermediate product is inserted into a die hole of a die which is complementary to an umbrella portion of an engine valve to be processed, and an end face of the umbrella portion is strongly pressed by a punch to plastically deform the bulging portion. 3. The method according to claim 1, wherein the valve face is hardened.
を施すことを特徴とする請求項１〜３のいずれかに記載
のエンジンバルブにおける弁フェース部の硬化方法。4. The method according to claim 1, wherein the bulging portion is plastically deformed and then subjected to aging treatment.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29804999A JP2001115808A (en) | 1999-10-20 | 1999-10-20 | Hardening method of valve face part in engine valve |
| US09/488,160 US6295731B1 (en) | 1999-10-20 | 2000-01-20 | Method of hardening a valve face of a poppet valve |
| EP00101170A EP1094202A3 (en) | 1999-10-20 | 2000-01-21 | Method of hardening a valve face in a poppet valve |
| KR1020000003964A KR20010039528A (en) | 1999-10-20 | 2000-01-27 | Method of hardening a valve face of a poppet valve |
| CN00100812A CN1305051A (en) | 1999-10-20 | 2000-02-14 | Method of reinforcing hardness of lift valve surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29804999A JP2001115808A (en) | 1999-10-20 | 1999-10-20 | Hardening method of valve face part in engine valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001115808A true JP2001115808A (en) | 2001-04-24 |
Family
ID=17854481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29804999A Pending JP2001115808A (en) | 1999-10-20 | 1999-10-20 | Hardening method of valve face part in engine valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001115808A (en) |
Cited By (5)
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|---|---|---|---|---|
| JP2006231384A (en) * | 2005-02-25 | 2006-09-07 | Kobe Steel Ltd | Method for predicting forging crack in cold forging process |
| JP2006329184A (en) * | 2005-04-27 | 2006-12-07 | Osaka Gas Co Ltd | Engine valve, its manufacturing method, its shape deciding method, and engine |
| KR101177687B1 (en) | 2011-10-14 | 2012-08-27 | 니탄 밸브 가부시키가이샤 | Manufacturing method of internal combustion engine valve |
| WO2013054437A1 (en) * | 2011-10-14 | 2013-04-18 | 日鍛バルブ株式会社 | Method for manufacturing valve for internal combustion engine |
| JP5739596B1 (en) * | 2014-08-27 | 2015-06-24 | 日鍛バルブ株式会社 | Poppet valve and manufacturing method thereof |
-
1999
- 1999-10-20 JP JP29804999A patent/JP2001115808A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006231384A (en) * | 2005-02-25 | 2006-09-07 | Kobe Steel Ltd | Method for predicting forging crack in cold forging process |
| JP4559256B2 (en) * | 2005-02-25 | 2010-10-06 | 株式会社神戸製鋼所 | Prediction method of forging cracks in cold forging process |
| JP2006329184A (en) * | 2005-04-27 | 2006-12-07 | Osaka Gas Co Ltd | Engine valve, its manufacturing method, its shape deciding method, and engine |
| JP5575991B2 (en) * | 2011-10-14 | 2014-08-20 | 日鍛バルブ株式会社 | Method for manufacturing a valve for an internal combustion engine |
| US8978248B2 (en) | 2011-10-14 | 2015-03-17 | Nittan Valve Co., Ltd. | Method of manufacturing a valve for an internal combustion engine |
| WO2013054436A1 (en) * | 2011-10-14 | 2013-04-18 | 日鍛バルブ株式会社 | Method for manufacturing valve for internal combustion engine |
| WO2013054437A1 (en) * | 2011-10-14 | 2013-04-18 | 日鍛バルブ株式会社 | Method for manufacturing valve for internal combustion engine |
| CN103797220A (en) * | 2011-10-14 | 2014-05-14 | 日锻汽门株式会社 | Method for manufacturing valve for internal combustion engine |
| KR101177687B1 (en) | 2011-10-14 | 2012-08-27 | 니탄 밸브 가부시키가이샤 | Manufacturing method of internal combustion engine valve |
| EP2767687A4 (en) * | 2011-10-14 | 2015-01-21 | Nittan Valva | Method for manufacturing valve for internal combustion engine |
| JP5010765B1 (en) * | 2011-10-14 | 2012-08-29 | 日鍛バルブ株式会社 | Method for manufacturing a valve for an internal combustion engine |
| US9015940B2 (en) | 2011-10-14 | 2015-04-28 | Nittan Valve Co., Ltd. | Method of manufacturing a valve for an internal combustion engine |
| JP5739596B1 (en) * | 2014-08-27 | 2015-06-24 | 日鍛バルブ株式会社 | Poppet valve and manufacturing method thereof |
| WO2016030983A1 (en) * | 2014-08-27 | 2016-03-03 | 日鍛バルブ株式会社 | Poppet valve and method for manufacturing same |
| KR20160034841A (en) * | 2014-08-27 | 2016-03-30 | 니탄 밸브 가부시키가이샤 | Poppet valve and manufacturing method thereof |
| KR101629623B1 (en) * | 2014-08-27 | 2016-06-10 | 니탄 밸브 가부시키가이샤 | Poppet valve and manufacturing method thereof |
| US10473002B2 (en) | 2014-08-27 | 2019-11-12 | Nittan Valve Co., Ltd. | Poppet valve and method for manufacturing same |
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