JPH05256190A - Cylinder head - Google Patents
Cylinder headInfo
- Publication number
- JPH05256190A JPH05256190A JP5489392A JP5489392A JPH05256190A JP H05256190 A JPH05256190 A JP H05256190A JP 5489392 A JP5489392 A JP 5489392A JP 5489392 A JP5489392 A JP 5489392A JP H05256190 A JPH05256190 A JP H05256190A
- Authority
- JP
- Japan
- Prior art keywords
- valve seat
- cylinder head
- base material
- overlaying
- hard
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車用エンジン等の
内燃機関に用いられるシリンダヘッドに関し、特に、バ
ルブシート相当部にレーザ光等の高密度エネルギ熱源を
用いた肉盛による硬質肉盛層を形成してバルブシート形
状に仕上げたバルブシートをそなえたシリンダヘッドに
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder head used in an internal combustion engine such as an automobile engine, and more particularly to a hard overlay layer formed by overlaying a high density energy heat source such as laser light on a portion corresponding to a valve seat. The present invention relates to a cylinder head provided with a valve seat that is formed into a valve seat shape.
【０００２】[0002]
【従来の技術】バルブシート相当部に肉盛による硬質肉
盛層を形成してバルブシート形状に仕上げたバルブシー
トをそなえたシリンダヘッドとしては、例えば、図７に
示すものがある。2. Description of the Related Art A cylinder head having a valve seat finished by forming a hard overlay layer by overlaying on a portion corresponding to the valve seat is shown in FIG. 7, for example.
【０００３】図７に示すシリンダヘッド５１において、
左側のポート部Ｌは肉盛を行った後の状態を示し、右側
のポート部Ｒは肉盛を行ったあとに仕上げ加工を施した
後の状態を示している。In the cylinder head 51 shown in FIG. 7,
The port portion L on the left side shows a state after overlaying, and the port portion R on the right side shows a state after performing overlaying after performing overlaying.
【０００４】図７の左側のポート部Ｌに示すように、従
来の場合には、シリンダヘッド５１のバルブシート相当
部に座ぐり加工によって角形状凹部５２を形成し、この
角形状凹部５２の表面に、高密度エネルギ熱源としての
レーザ光５３の照射と、粉末供給ノズル５４からの肉盛
用粉末５５の供給とによる肉盛を行って、硬質肉盛層５
６を形成し、次いで、図７の右側のポート部Ｒに示すよ
うに、バルブシート形状に仕上げることによって、シリ
ンダヘッド５１のポート部分にバルブシート５７をそな
えるものとしていた。As shown in the port portion L on the left side of FIG. 7, in the conventional case, a square recess 52 is formed in the portion corresponding to the valve seat of the cylinder head 51 by spot facing, and the surface of the square recess 52 is formed. Then, the hard overlay layer 5 is subjected to overlay by irradiating the laser beam 53 as a high-density energy heat source and supplying the overlay powder 55 from the powder supply nozzle 54.
6, the valve seat 57 was provided at the port portion of the cylinder head 51 by finishing the valve seat shape as shown in the port R on the right side of FIG.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記し
たようなバルブシート相当部に肉盛による硬質肉盛層を
形成してバルブシート形状に仕上げたバルブシート５７
をそなえたシリンダヘッド５１にあっては、肉盛を行う
母材表面に座ぐり加工によって角形状凹部５２を形成
し、しかる後に肉盛加工を行うものとなっていたため、
角形状凹部５２の壁面での角度変化が急であることか
ら、肉盛加工時に不可避的に発生する気泡がこれら壁面
で捕らえられ、これによって硬質肉盛層５６と母材との
間に空孔等の欠陥Ｄがしばしば発生することがあり、ま
た、レーザ光５３を加工熱源として用いた場合には、レ
ーザ光５３の入射角度が急激に変化して局部的な未溶融
が起こることがあり、バルブシート相当部での密着性が
悪く耐久性に劣ることがあり、さらに、高い冷却能が得
られないことがあるなどといった問題点があった。However, the valve seat 57 is finished in the valve seat shape by forming a hard overlay layer by overlaying on the portion corresponding to the valve seat as described above.
In the cylinder head 51 provided with the above, since the angular recess 52 is formed on the surface of the base material for overlaying by spot facing, and the overlaying is performed thereafter.
Since the angle change on the wall surface of the rectangular recess 52 is abrupt, air bubbles that are inevitably generated during overlay processing are trapped on these wall surfaces, which creates voids between the hard overlay layer 56 and the base material. May often occur, and when the laser light 53 is used as a processing heat source, the incident angle of the laser light 53 may change rapidly and local unmelting may occur. There are problems such as poor adhesion at the valve seat equivalent part and poor durability, and sometimes high cooling capacity cannot be obtained.
【０００６】また、図８に示すように、特に熱容量が小
さい弁間部５８にあっては、レーザ光５３のような高密
度エネルギを加工熱源として用いた場合であっても、母
材部の溶融から肉盛合金の希釈が発生し、所定の硬度や
強度が得られないことがあり、さらに、座ぐり加工によ
って形成されていた角形状凹部５２の棚状の領域が小さ
いため、バルブシート相当部の内面に肉盛合金の欠落Ｆ
が発生することがあるなどといった問題点があった。Further, as shown in FIG. 8, particularly in the intervalve portion 58 having a small heat capacity, even when high-density energy such as the laser beam 53 is used as a processing heat source, Dilution of the hardfacing alloy may occur due to melting, and the prescribed hardness and strength may not be obtained. Furthermore, since the ledge-shaped area of the square-shaped recess 52 formed by the spot facing process is small, it corresponds to a valve seat. Lack of overlay alloy on the inner surface of the part F
There was a problem such as occurrence of.
【０００７】したがって、従来の技術では、上記した問
題点を解決することが課題として存在していた。Therefore, the conventional technique has a problem to solve the above-mentioned problems.
【０００８】[0008]
【発明の目的】本発明は、上述した従来の課題にかんが
みてなされたもので、硬質肉盛層と母材との間に空孔等
の欠陥を発生することがなく、また、レーザ光を加工熱
源として用いたときでも局部的な未溶融を起こすことが
なくなって肉盛界面での密着性が良く冷却能に優れてお
り、さらには、肉盛界面での希釈が少なく、バルブシー
ト相当部に欠落等の欠陥のない所定の硬度および強度を
有するバルブシートをそなえたシリンダヘッドを提供す
ることを目的としている。DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and does not cause defects such as holes between the hard overlay layer and the base material, and also allows laser light to be emitted. Even when used as a processing heat source, local unmelting does not occur, adhesion at the build-up interface is good, and cooling performance is excellent.Furthermore, dilution at the build-up interface is small, and the valve seat equivalent part It is an object of the present invention to provide a cylinder head provided with a valve seat having a predetermined hardness and strength without defects such as missing.
【０００９】[0009]
【課題を解決するための手段】本発明の請求項１に係わ
るシリンダヘッドは、バルブシート相当部にレーザ等の
高密度エネルギ熱源を用いた肉盛による硬質肉盛層を形
成してバルブシート形状に仕上げたバルブシートをそな
えたシリンダヘッドにおいて、肉盛を行うシリンダヘッ
ド母材表面に予め座ぐり加工によって隅Ｒ部をつけたＲ
形状凹部を形成して前記Ｒ形状凹部に肉盛による硬質肉
盛層を形成してバルブシート形状に仕上げたバルブシー
トをそなえた構成としたことを特徴としている。In a cylinder head according to claim 1 of the present invention, a valve seat shape is formed by forming a hard overlay layer by overlaying using a high-density energy heat source such as a laser on a portion corresponding to the valve seat. In a cylinder head with a finished valve seat, a corner R part is preliminarily formed by spot facing on the surface of the cylinder head base material to be built up.
It is characterized in that a valve seat finished in a valve seat shape is formed by forming a shape recess and forming a hard overlay layer by overlaying on the R-shape recess.
【００１０】また、本発明の請求項２に係わるシリンダ
ヘッドは、バルブシート相当部にレーザ等の高密度エネ
ルギ熱源を用いた肉盛による硬質肉盛層を形成してバル
ブシート形状に仕上げたバルブシートをそなえたシリン
ダヘッドにおいて、肉盛を行うシリンダヘッド母材の吸
／排気ポート端部の内側に予め余肉部を設けて前記余肉
部を含む部位に肉盛による硬質肉盛層を形成してバルブ
シート形状に仕上げたバルブシートをそなえた構成とし
たことを特徴としており、必要に応じて採用される実施
態様において、余肉部を設けたシリンダヘッド母材表面
に予め座ぐり加工によって前記余肉部から滑らかに連続
するＲ部をつけたＲ形状凹部を形成して前記Ｒ形状凹部
に肉盛による硬質肉盛層を形成してバルブシート形状に
仕上げたバルブシートをそなえた構成としたことを特徴
としている。In the cylinder head according to the second aspect of the present invention, the valve seat is finished by forming a hard overlay layer by overlaying using a high-density energy heat source such as a laser on a portion corresponding to the valve seat. In a cylinder head with a sheet, a surplus portion is provided in advance inside the intake / exhaust port end of the cylinder head base material for surfacing, and a hard surfacing layer is formed by surfacing at a portion including the surplus portion. It is characterized in that it has a valve seat finished in a valve seat shape, and in the embodiment adopted as necessary, by counterbore processing beforehand on the surface of the cylinder head base material provided with a surplus portion. A valve seat finished by forming an R-shaped concave portion having a smoothly continuous R portion from the excess thickness portion and forming a hard overlay layer by overlaying on the R-shaped concave portion to form a valve seat shape. It is characterized in that it has a configuration which includes a door.
【００１１】図１は、本発明の一実施態様を示すもので
あって、図１に示すシリンダヘッド１において、左側の
ポート部Ｌは肉盛を行った後の状態を示し、右側のポー
ト部Ｒは肉盛を行ったあとに仕上げ加工を施した後の状
態を示している。FIG. 1 shows an embodiment of the present invention. In the cylinder head 1 shown in FIG. 1, the left port portion L shows a state after overlaying, and the right port portion. R shows the state after finishing processing after overlaying.
【００１２】このシリンダヘッド１のポート開口部分に
あるバルブシート相当部２には、高密度エネルギ熱源と
してレーザ光３が照射されるが、このレーザ光３は図示
しないレーザ発生装置から照射されかつ適当な集光手段
によって適当な大きさに集光されて処理面に照射され
る。The valve seat corresponding portion 2 at the port opening portion of the cylinder head 1 is irradiated with a laser beam 3 as a high-density energy heat source. The laser beam 3 is appropriately emitted from a laser generator (not shown). The light is condensed into an appropriate size by a different light condensing means and is irradiated onto the processing surface.
【００１３】この処理時において、バルブシート相当部
２は、バルブ軸Ｃの回りに矢印Ａ方向に相対的に回転さ
れ、このバルブシート相当部２の母材部分の表面には、
予め座ぐり加工によって隅Ｒ部をつけたＲ形状凹部４が
形成されている。During this process, the valve seat corresponding portion 2 is relatively rotated around the valve axis C in the direction of the arrow A, and the surface of the base material portion of the valve seat corresponding portion 2 is
An R-shaped concave portion 4 having a corner R portion is previously formed by counter boring.
【００１４】この隅Ｒ部をつけたＲ形状凹部４の上に
は、良好な耐摩耗性を発揮する銅系肉盛用粉末（例え
ば、特願平２−２９５６７３号明細書に記載の銅基合金
粉末）５が、図示しない粉末供給装置より粉末供給ノズ
ル６によって供給され、Ｒ形状凹部４の上に硬質肉盛層
７が形成される。この硬質肉盛層７は必要に応じて多層
盛りにされる。このとき、シールドガス８を矢印方向に
流すことによって、処理部分を酸化反応などから保護す
る。On the R-shaped concave portion 4 having the corner R portion, a copper-based build-up powder exhibiting good wear resistance (for example, the copper-based powder described in Japanese Patent Application No. 2-295673). The alloy powder) 5 is supplied by a powder supply nozzle 6 from a powder supply device (not shown), and a hard buildup layer 7 is formed on the R-shaped recess 4. The hard buildup layer 7 is formed in multiple layers as needed. At this time, by flowing the shield gas 8 in the direction of the arrow, the treated portion is protected from the oxidation reaction and the like.
【００１５】本発明では、シリンダヘッド１のバルブシ
ート相当部２に、隅Ｒ部をつけたＲ形状凹部４が形成さ
れているため、肉盛加工時に不可避的に発生する気泡が
壁面で捕らえられることがないので、硬質肉盛層７と母
材（１）との間に空孔等の欠陥が発生しにくい。In the present invention, since the R-shaped concave portion 4 having the corner R portion is formed in the valve seat corresponding portion 2 of the cylinder head 1, the air bubbles which are unavoidably generated during the overlaying are caught on the wall surface. Since it does not occur, defects such as holes are less likely to occur between the hard facing layer 7 and the base material (1).
【００１６】また、レーザ光３の入射角度が急激に変化
しないため局部的な未溶融が起こりにくく、健全な界面
が得られ、硬質肉盛層７と母材（１）との密着性が良く
なる。Further, since the incident angle of the laser beam 3 does not change abruptly, local unmelting hardly occurs, a sound interface is obtained, and the adhesion between the hard facing layer 7 and the base material (1) is good. Become.
【００１７】このようにして硬質肉盛層７を形成した
後、バルブシート形状に仕上げ加工を行うことによっ
て、所定のバルブシート９の表面形状をもつシリンダヘ
ッド１とする。After the hard buildup layer 7 is formed in this manner, the valve head is finished to obtain the cylinder head 1 having a predetermined valve seat 9 surface shape.
【００１８】図４は、本発明の他の実施態様を示すもの
であって、図４に示すシリンダヘッド１において、左側
のポート部Ｌは肉盛を行った後の状態を示し、右側のポ
ート部Ｒは肉盛を行ったあとに仕上げ加工を施した後の
状態を示している。FIG. 4 shows another embodiment of the present invention. In the cylinder head 1 shown in FIG. 4, the port portion L on the left side shows a state after overlaying, and the port on the right side is shown. Part R shows the state after finishing processing is performed after overlaying.
【００１９】このシリンダヘッド１のポート開口部分に
あるバルブシート相当部２には、高密度エネルギ熱源と
してレーザ光３が照射されるが、このレーザ光３は図示
しないレーザ発生装置から照射されかつ適当な集光手段
によって適当な大きさに集光されて処理面に照射され
る。The valve seat corresponding portion 2 at the port opening portion of the cylinder head 1 is irradiated with a laser beam 3 as a high-density energy heat source. The laser beam 3 is emitted from a laser generator (not shown) and is appropriate. The light is condensed into an appropriate size by a different light condensing means and is irradiated onto the processing surface.
【００２０】この処理時において、バルブシート相当部
２は、バルブ軸Ｃの回りに矢印Ａ方向に相対的に回転さ
れ、肉盛を行うシリンダヘッド母材の吸／排気ポート端
部の内側に予め余肉部１０が設けられている。During this process, the valve seat corresponding portion 2 is relatively rotated around the valve axis C in the direction of the arrow A, and is preliminarily provided inside the suction / exhaust port end of the cylinder head base material for overlaying. A surplus portion 10 is provided.
【００２１】そして、この余肉部１０を設けたシリンダ
ヘッド母材表面には、予め座ぐり加工によって前記余肉
部１０から滑らかに連続するＲ部をつけたＲ形状凹部４
が形成されているようにすることが望ましい。On the surface of the cylinder head base material provided with the extra thickness portion 10, an R-shaped concave portion 4 having an R portion smoothly continuing from the extra thickness portion 10 is previously formed by counter boring.
Are preferably formed.
【００２２】この余肉部１０から滑らかに連続するＲ形
状凹部４の上には、良好な耐摩耗性を発揮する銅系肉盛
用粉末（例えば、前記と同様に、特願平２−２９５６７
３号明細書に記載の銅基合金粉末）５が、図示しない粉
末供給装置より粉末供給ノズル６によって供給され、Ｒ
形状凹部４の上に硬質肉盛層７が形成される。この硬質
肉盛層７は必要に応じて多層盛りにされる。このとき、
シールドガス８を矢印方向に流すことによって、処理部
分を酸化反応などから保護する。On the R-shaped concave portion 4 which is smoothly continuous from the surplus portion 10, a copper-based build-up powder exhibiting excellent wear resistance (for example, as in the above, Japanese Patent Application No. 2-29567).
The copper-based alloy powder 5 described in No. 3 is supplied by a powder supply nozzle 6 from a powder supply device (not shown), and R
A hard overlay layer 7 is formed on the shaped recess 4. The hard buildup layer 7 is formed in multiple layers as needed. At this time,
By flowing the shield gas 8 in the direction of the arrow, the treated portion is protected from the oxidation reaction and the like.
【００２３】本発明では、シリンダヘッド母材の吸／排
気ポート端部の内側に予め余肉部１０が設けられている
ため、肉盛部分が弁間部１２であっても母材側の熱容量
が不足することがなくなることから、希釈の少ない肉盛
加工が行われる。According to the present invention, since the excess thickness portion 10 is provided inside the end portion of the intake / exhaust port of the cylinder head base material in advance, even if the built-up portion is the intervalve portion 12, the heat capacity on the base material side. Since there is no shortage, the overlay processing with less dilution is performed.
【００２４】また、余肉部１０には母材部から滑らかに
連続するＲ部がつけられてＲ形状凹部４を有しているも
のとなすことによって、肉盛加工時に不可避的に発生す
る気泡が壁面で捕らえられることがなくなるので、硬質
肉盛層７と母材（１）との間に空孔等の欠陥が発生しに
くい。Further, since the surplus portion 10 is provided with an R portion which is smoothly continuous from the base material portion and has the R-shaped concave portion 4, air bubbles which are unavoidably generated during overlay processing. Is no longer caught on the wall surface, so defects such as holes are less likely to occur between the hard overlay layer 7 and the base material (1).
【００２５】さらに、レーザ光３の入射角度が急激に変
化しないため局部的な未溶融が起こりにくく、健全な界
面が得られ、硬質肉盛層７と母材（１）との密着性が良
くなる。Furthermore, since the incident angle of the laser beam 3 does not change abruptly, local unmelting hardly occurs, a sound interface is obtained, and the adhesion between the hard facing layer 7 and the base material (1) is good. Become.
【００２６】このようにして硬質肉盛層７を形成した
後、バルブシート形状に仕上げ加工を行うことによっ
て、所定のバルブシート９の表面形状をもつシリンダヘ
ッド１とする。After the hard overlay layer 7 is formed in this manner, the valve head is finished to obtain the cylinder head 1 having a predetermined valve seat 9 surface shape.
【００２７】[0027]
【発明の作用】本発明に係わるシリンダヘッドでは、高
密度エネルギ熱源を用いて肉盛を行うシリンダヘッド母
材表面に予め座ぐり加工によって隅Ｒ部をつけたＲ形状
凹部を形成して前記Ｒ形状凹部に肉盛による硬質肉盛層
を形成してバルブシート形状に仕上げたバルブシートを
そなえた構成としたから、肉盛加工時に不可避的に発生
する気泡が壁面で捕らえられることがないので、硬質肉
盛層と母材との間に空孔等の欠陥が発生しにくいと共
に、高密度エネルギ熱源としてレーザ光を使用した場合
にその入射角度が急激に変化しないため局部的な未溶融
が起こりにくく、健全な界面が得られ、硬質肉盛層と母
材との密着性が良くなる。In the cylinder head according to the present invention, the R-shaped concave portion having the corner R portion is previously formed by counterbore processing on the surface of the cylinder head base material for overlaying using the high-density energy heat source. Since the valve seat is finished by forming a hard overlay layer by overlaying in the shape recess to form a valve seat, air bubbles that are unavoidably generated during overlay processing cannot be caught on the wall surface. Defects such as holes are unlikely to occur between the hard overlay layer and the base material, and when laser light is used as a high-density energy heat source, the incident angle does not change rapidly, causing local unmelting. A difficult and sound interface is obtained, and the adhesion between the hard overlay layer and the base material is improved.
【００２８】また、肉盛を行うシリンダヘッド母材の吸
／排気ポート端部の内側に予め余肉部を設けて前記余肉
部を含む部位に肉盛による硬質肉盛層を形成してバルブ
シート形状に仕上げたバルブシートをそなえた構成とす
ることによって、肉盛部分が弁間部であっても母材側の
熱容量不足がなくなることから、希釈の少ない肉盛加工
が行われ、さらに、余肉部を設けたシリンダヘッド母材
表面に予め座ぐり加工によって前記余肉部から滑らかに
連続するＲ部をつけたＲ形状凹部を形成して前記Ｒ形状
凹部に肉盛による硬質肉盛層を形成してバルブシート形
状に仕上げたバルブシートをそなえた構成とすることに
よって、肉盛加工時に不可避的に発生する気泡が壁面で
捕らえられることがなくなるので、硬質肉盛層と母材と
の間に空孔等の欠陥が発生しにくいと共に、レーザ光を
用いた場合にその入射角度が急激に変化しないため局部
的な未溶融が起こりにくく、健全な界面が得られ、硬質
肉盛層と母材との密着性が良くなり、硬度および強度に
優れたバルブシートをそなえたシリンダヘッドとなる。A valve is formed by forming a surplus portion in advance inside the intake / exhaust port of the cylinder head base material for surfacing and forming a hard surfacing layer by surfacing at a portion including the surplus portion. By adopting a configuration with a valve seat finished in a seat shape, even if the built-up portion is an intervalve portion, there is no shortage of heat capacity on the base material side, so that the overlay processing with less dilution is performed. An R-shaped recess having an R portion smoothly continuing from the excess thickness is formed on the surface of the base material of the cylinder head provided with the excess thickness in advance, and a hard overlay layer is formed by overlaying on the R-shaped recess. By forming a valve seat that has been formed into a valve seat shape by forming a valve seat, bubbles that are unavoidably generated during overlay processing will not be caught on the wall surface, so that the hard overlay layer and the base material Missing holes etc. between Is less likely to occur, and when the laser beam is used, the incident angle does not change rapidly, so local unmelting does not occur easily, a sound interface is obtained, and the adhesion between the hard overlay layer and the base material is A cylinder head with a valve seat that is improved and has excellent hardness and strength.
【００２９】[0029]
（実施例１）この実施例１では、図１をもとにして説明
した本発明の一実施態様の実施結果について、図２，図
３を加えて説明する。(Embodiment 1) In this embodiment 1, an implementation result of one embodiment of the present invention described based on FIG. 1 will be described with reference to FIGS.
【００３０】この実施例１においては、アルミニウム合
金（ＪＩＳ ＡＣ４Ｂ）からなるシリンダヘッド１の硬
質肉盛層７を形成すべきバルブシート相当部２に、隅Ｒ
を１０Ｒとして３０度の傾斜をつけたＲ形状凹部４を座
ぐり加工によって形成した後、銅系肉盛材として、平均
粒径１００μｍ、重量％で、Ａｌ：８％，Ｎｉ：５％，
Ｆｅ：３％を含有し、残部がＣｕおよび不可避的不純物
よりなる肉盛用粉末５を用い、レーザ光３として、パワ
ー密度：２０００Ｗ／ｍｍ２、出力モード：マルチモー
ド、相対移動速度：０．２ｍ／ｍｉｎ、シールドガス：
Ａｒ、シールドガス流量：１０ ｌ／ｍｉｎ、銅系肉盛
用合金粉末の供給量：２５ｇ／ｍｉｎの肉盛条件とし
て、厚さ３ｍｍの硬質肉盛層７を形成し、さらに、仕上
げ加工を行うことにより所定のバルブシート９の表面形
状に加工した。In the first embodiment, the corner R is formed in the valve seat corresponding portion 2 where the hard overlay layer 7 of the cylinder head 1 made of aluminum alloy (JIS AC4B) is to be formed.
After forming the R-shaped recess 4 having a slope of 30 degrees with 10 R as a countersink, a copper-based build-up material having an average particle diameter of 100 μm, weight%, Al: 8%, Ni: 5%,
Using a build-up powder 5 containing Fe: 3% and the balance being Cu and inevitable impurities, a laser beam 3 having a power density of 2000 W / mm 2 , an output mode of multimode, and a relative moving speed of 0. 2m / min, shield gas:
Ar, shield gas flow rate: 10 l / min, supply amount of copper-based overlaying alloy powder: 25 g / min, the hard buildup layer 7 having a thickness of 3 mm is formed, and further finishing processing is performed. Thus, the surface shape of the predetermined valve seat 9 was processed.
【００３１】図２は、この実施例１で製造したシリンダ
ヘッド１の要部を示すものであって、１１はシリンダヘ
ッド本体、１２は吸気／排気ポート部、１３は燃焼室の
一部、１４はエンジンバルブ、９はバルブシートであ
る。FIG. 2 shows the essential parts of the cylinder head 1 manufactured in the first embodiment. 11 is the cylinder head body, 12 is the intake / exhaust port, 13 is part of the combustion chamber, and 14 is Is an engine valve, and 9 is a valve seat.
【００３２】このバルブシート９が形成される母材側表
面は、隅Ｒを１０Ｒとして３０度の傾斜をつけた隅Ｒ部
を有するＲ形状凹部４が加工されており、このようなシ
リンダヘッド１においては、図３に拡大して示すよう
に、硬質肉盛層７と母材（１１）との間に空孔等の欠陥
がなく、硬質肉盛層７と母材（１１）との密着性が著し
く良好なものとなっていて熱伝導性に優れたものとなっ
ていた。The surface of the base material side on which the valve seat 9 is formed is processed with an R-shaped recess 4 having a corner R having a corner R of 30 degrees and an inclination of 30 degrees. In FIG. 3, as shown in an enlarged scale in FIG. 3, there is no defect such as voids between the hard overlay layer 7 and the base material (11), and the hard overlay layer 7 and the base material (11) adhere to each other. The properties were remarkably good and the heat conductivity was excellent.
【００３３】（実施例２）この実施例２では、図４をも
とにして説明した本発明の他の実施態様の実施結果につ
いて、図５，図６を加えて説明する。(Embodiment 2) In Embodiment 2, the results of the other embodiment of the present invention described with reference to FIG. 4 will be described with reference to FIGS.
【００３４】この実施例２においては、アルミニウム合
金（ＪＩＳ ＡＣ４Ｂ）からなるシリンダヘッド１の吸
／排気ポート端部に予め厚み６ｍｍの余肉部１０を設
け、この余肉部１０を含むバルブシート相当部２に、隅
Ｒを１０Ｒとして３０度の傾斜をつけたＲ形状凹部４を
座ぐり加工によって形成した後、銅系肉盛材として、平
均粒径１００μｍ、重量％で、Ａｌ：８％，Ｎｉ：５
％，Ｆｅ：３％を含有し、残部がＣｕおよび不可避的不
純物よりなる肉盛用粉末５を用い、レーザ光３として、
パワー密度：２０００Ｗ／ｍｍ２、出力モード：マルチ
モード、相対移動速度：０．２ｍ／ｍｉｎ、シールドガ
ス：Ａｒ、シールドガス流量：１０ ｌ／ｍｉｎ、銅系
肉盛用合金粉末の供給量：２５ｇ／ｍｉｎの肉盛条件と
して、厚さ３ｍｍの硬質肉盛層７を形成し、さらに、仕
上げ加工を行うことにより所定のバルブシート９の表面
形状に加工した。In the second embodiment, a cylinder head 1 made of an aluminum alloy (JIS AC4B) is provided with a surplus portion 10 having a thickness of 6 mm in advance at the end of the intake / exhaust port, and is equivalent to a valve seat including the surplus portion 10. After forming an R-shaped concave portion 4 having a corner R of 10 R and an inclination of 30 degrees in the portion 2 by spot facing, a copper-based overlay material having an average particle diameter of 100 μm, a weight percentage of Al: 8%, Ni: 5
%, Fe: 3%, with the balance being Cu and unavoidable impurities as a build-up powder 5, using laser light 3 as
Power density: 2000 W / mm 2 , output mode: multi-mode, relative movement speed: 0.2 m / min, shield gas: Ar, shield gas flow rate: 10 l / min, supply amount of copper-based overlaying alloy powder: 25 g As a build-up condition of / min, a hard build-up layer 7 having a thickness of 3 mm was formed, and further finishing processing was performed to form a predetermined surface shape of the valve seat 9.
【００３５】図５は、この実施例２で製造したシリンダ
ヘッド１の要部を示すものであって、１１はシリンダヘ
ッド本体、１２は吸気／排気ポート部、１３は燃焼室の
一部、１４はエンジンバルブ、９はバルブシートであ
る。FIG. 5 shows a main part of the cylinder head 1 manufactured in the second embodiment. 11 is a cylinder head body, 12 is an intake / exhaust port part, 13 is a part of a combustion chamber, and 14 is a part. Is an engine valve, and 9 is a valve seat.
【００３６】このバルブシート９が形成される母材側表
面は、隅Ｒを１０Ｒとして３０度の傾斜をつけた隅Ｒ部
を有するＲ形状凹部４が加工されており、このようなシ
リンダヘッド１においては、図６に拡大して示すよう
に、硬質肉盛層７と母材（１１）との間に空孔等の欠陥
がなく、硬質肉盛層７と母材（１１）との密着性が著し
く良好なものとなっていて熱伝導性に優れたものとなっ
ていた。そして、熱容量が小さい弁間部においても肉盛
界面での希釈はみられず、所要の硬度および強度を得る
ことが可能であると共に、バルブシート相当部にも欠落
等の欠陥のないことが認められた。On the surface of the base material side on which the valve seat 9 is formed, an R-shaped concave portion 4 having a corner R portion with a corner R of 10R and an inclination of 30 degrees is processed. In FIG. 6, as shown in an enlarged view in FIG. 6, there is no defect such as voids between the hard overlay layer 7 and the base material (11), and the hard overlay layer 7 and the base material (11) adhere to each other. The properties were remarkably good and the heat conductivity was excellent. No dilution was observed at the build-up interface even in the intervalve area where the heat capacity was small, and it was possible to obtain the required hardness and strength, and it was confirmed that there was no defect such as missing in the valve seat equivalent part. Was given.
【００３７】[0037]
【発明の効果】本発明に係わるシリンダヘッドでは、高
密度エネルギ熱源を用いて肉盛を行うシリンダヘッド母
材表面に予め座ぐり加工によって隅Ｒ部をつけたＲ形状
凹部を形成して前記Ｒ形状凹部に肉盛による硬質肉盛層
を形成してバルブシート形状に仕上げたバルブシートを
そなえた構成としたから、肉盛加工時に不可避的に発生
する気泡が壁面で捕らえられることがないので、硬質肉
盛層と母材との間に空孔等の欠陥が発生しにくいと共
に、高密度エネルギ熱源としてレーザ光を使用した場合
にその入射角度が急激に変化しないため局部的な未溶融
が起こりにくく、健全な界面が得られ、硬質肉盛層と母
材との密着性が良くなるという著しく優れた効果がもた
らされる。In the cylinder head according to the present invention, the R-shaped concave portion having the corner R portion is previously formed by counterbore processing on the surface of the base material of the cylinder head for overlaying using the high-density energy heat source. Since the valve seat is finished by forming a hard overlay layer by overlaying in the shape recess to form a valve seat, air bubbles that are unavoidably generated during overlay processing cannot be caught on the wall surface. Defects such as holes are unlikely to occur between the hard overlay layer and the base material, and when laser light is used as a high-density energy heat source, the incident angle does not change rapidly, causing local unmelting. A difficult and sound interface is obtained, and the remarkably excellent effect of improving the adhesion between the hard overlay layer and the base material is brought about.
【００３８】また、肉盛を行うシリンダヘッド母材の吸
／排気ポート端部の内側に予め余肉部を設けて前記余肉
部を含む部位に肉盛による硬質肉盛層を形成してバルブ
シート形状に仕上げたバルブシートをそなえた構成とす
ることによって、肉盛部分が弁間部であっても母材側の
熱容量不足がなくなることから、希釈の少ない肉盛加工
が行われ、さらに、余肉部を設けたシリンダヘッド母材
表面に予め座ぐり加工によって前記余肉部から滑らかに
連続するＲ部をつけたＲ形状凹部を形成して前記Ｒ形状
凹部に肉盛による硬質肉盛層を形成してバルブシート形
状に仕上げたバルブシートをそなえた構成とすることに
よって、肉盛加工時に不可避的に発生する気泡が壁面で
捕らえられることがなくなるので、硬質肉盛層と母材と
の間に空孔等の欠陥が発生しにくいと共に、レーザ光を
用いた場合にその入射角度が急激に変化しないため局部
的な未溶融が起こりにくく、健全な界面が得られ、硬質
肉盛層と母材との密着性が良くなり、硬度および強度に
優れたバルブシートをそなえたシリンダヘッドとするこ
とが可能になるという著しく優れた効果がもたらされ
る。A valve is formed by providing a surplus portion in advance inside the suction / exhaust port of the cylinder head base material for surfacing and forming a hard surfacing layer by surfacing at a portion including the surplus portion. By adopting a configuration with a valve seat finished in a seat shape, even if the built-up portion is an intervalve portion, there is no shortage of heat capacity on the base material side, so that the overlay processing with less dilution is performed. An R-shaped recess having an R portion smoothly continuing from the excess thickness is formed on the surface of the base material of the cylinder head provided with the excess thickness in advance, and a hard overlay layer is formed by overlaying on the R-shaped recess. By forming a valve seat that has been formed into a valve seat shape by forming a valve seat, bubbles that are unavoidably generated during overlay processing will not be caught on the wall surface, so that the hard overlay layer and the base material Missing holes etc. between Is less likely to occur, and when the laser beam is used, the incident angle does not change rapidly, so local unmelting does not occur easily, a sound interface is obtained, and the adhesion between the hard overlay layer and the base material is As a result, it is possible to obtain a remarkably excellent effect that a cylinder head having a valve seat excellent in hardness and strength can be provided.
【図１】本発明の一実施態様においてシリンダヘッドの
バルブシート相当部に肉盛を行った後の状態および肉盛
を行ったあとに仕上げ加工を施した後の状態を示す断面
説明図である。FIG. 1 is a cross-sectional explanatory view showing a state after overlaying a valve seat equivalent portion of a cylinder head and a state after performing a finishing process after overlaying, in an embodiment of the present invention. ..
【図２】本発明の一実施態様にもとづく実施例１におけ
るシリンダヘッドの断面説明図である。FIG. 2 is an explanatory cross-sectional view of a cylinder head according to a first embodiment based on an embodiment of the present invention.
【図３】図２に示したシリンダヘッドのバルブシート部
分を拡大して示す断面説明図である。FIG. 3 is a cross-sectional explanatory view showing a valve seat portion of the cylinder head shown in FIG. 2 in an enlarged manner.
【図４】本発明の他の実施態様においてシリンダヘッド
のバルブシート相当部に肉盛を行った後の状態および肉
盛を行ったあとに仕上げ加工を施した後の状態を示す断
面説明図である。FIG. 4 is a cross-sectional explanatory view showing a state after overlaying a valve seat corresponding portion of a cylinder head and a state after performing a finishing process after overlaying in another embodiment of the present invention. is there.
【図５】本発明の他の実施態様にもとづく実施例２にお
けるシリンダヘッドの断面説明図である。FIG. 5 is a cross-sectional explanatory view of a cylinder head in a second embodiment based on another embodiment of the present invention.
【図６】図５に示したシリンダヘッドのバルブシート部
分を拡大して示す断面説明図である。6 is an enlarged cross-sectional explanatory view of a valve seat portion of the cylinder head shown in FIG.
【図７】従来のシリンダヘッドのバルブシート相当部に
肉盛を行った後の状態および肉盛を行ったあとに仕上げ
加工を施した後の状態を示す断面説明図である。FIG. 7 is a cross-sectional explanatory view showing a state after overlaying a valve seat corresponding portion of a conventional cylinder head and a state after performing overlaying and then finishing.
【図８】従来のシリンダヘッドのバルブシート相当部に
肉盛を行った後の状態および肉盛を行ったあとに仕上げ
加工を施した後の状態を示す断面説明図である。FIG. 8 is a cross-sectional explanatory view showing a state after overlaying a valve seat corresponding portion of a conventional cylinder head and a state after performing overlaying and then finishing.
１ シリンダヘッド ２ バルブシート相当部 ３ レーザ光（高密度エネルギ熱源） ４ Ｒ形状凹部 ５ 肉盛用粉末 ６ 粉末供給ノズル ７ 硬質肉盛層 ９ バルブシート １０ 余肉部 1 Cylinder Head 2 Equivalent to Valve Seat 3 Laser Light (High Density Energy Heat Source) 4 R-Shaped Recess 5 Powder for Build-up 6 Powder Supply Nozzle 7 Hard Build-up Layer 9 Valve Seat 10 Surplus
Claims (3)
エネルギ熱源を用いた肉盛による硬質肉盛層を形成して
バルブシート形状に仕上げたバルブシートをそなえたシ
リンダヘッドにおいて、肉盛を行うシリンダヘッド母材
表面に予め座ぐり加工によって隅Ｒ部をつけたＲ形状凹
部を形成して前記Ｒ形状凹部に肉盛による硬質肉盛層を
形成してバルブシート形状に仕上げたバルブシートをそ
なえたことを特徴とするシリンダヘッド。1. A cylinder head having a valve seat finished in a valve seat shape by forming a hard overlay layer by overlaying using a high-density energy heat source such as a laser on a portion corresponding to the valve seat, and performing the overlaying. An R-shaped recess having a rounded corner is formed in advance on the surface of the base material of the cylinder head, and a hard overlay layer is formed on the R-shaped recess by overlaying to form a valve seat. Cylinder head characterized by
エネルギ熱源を用いた肉盛による硬質肉盛層を形成して
バルブシート形状に仕上げたバルブシートをそなえたシ
リンダヘッドにおいて、肉盛を行うシリンダヘッド母材
の吸／排気ポート端部の内側に予め余肉部を設けて前記
余肉部を含む部位に肉盛による硬質肉盛層を形成してバ
ルブシート形状に仕上げたバルブシートをそなえたこと
を特徴とするシリンダヘッド。2. A cylinder head having a valve seat finished by forming a hard facing layer by overlaying using a high-density energy heat source such as a laser on a portion corresponding to the valve seat, and performing overlaying on the cylinder head. A valve seat finished by forming a surplus portion inside the end of the intake / exhaust port of the cylinder head base material in advance and forming a hard surfacing layer by surfacing at a portion including the surplus portion to form a valve seat shape. Cylinder head characterized by
に予め座ぐり加工によって前記余肉部から滑らかに連続
するＲ部をつけたＲ形状凹部を形成して前記Ｒ形状凹部
に肉盛による硬質肉盛層を形成してバルブシート形状に
仕上げたバルブシートをそなえた請求項２に記載のシリ
ンダヘッド。3. An R-shaped recess having an R portion smoothly continuing from the surplus portion is previously formed on the surface of the cylinder head base material provided with the surplus portion by counter boring, and the R-shaped recess is overlaid. The cylinder head according to claim 2, further comprising a valve seat finished by forming a hard overlay layer according to (1) to a valve seat shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04054893A JP3109222B2 (en) | 1992-03-13 | 1992-03-13 | Manufacturing method of cylinder head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04054893A JP3109222B2 (en) | 1992-03-13 | 1992-03-13 | Manufacturing method of cylinder head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05256190A true JPH05256190A (en) | 1993-10-05 |
| JP3109222B2 JP3109222B2 (en) | 2000-11-13 |
Family
ID=12983283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04054893A Expired - Fee Related JP3109222B2 (en) | 1992-03-13 | 1992-03-13 | Manufacturing method of cylinder head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3109222B2 (en) |
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|---|---|---|---|---|
| JP2017113766A (en) * | 2015-12-22 | 2017-06-29 | 株式会社豊田中央研究所 | Laser processing apparatus, laser processing method, optical system, and padding finished article |
| JP2019157837A (en) * | 2018-03-16 | 2019-09-19 | トヨタ自動車株式会社 | cylinder head |
| WO2020003462A1 (en) * | 2018-06-28 | 2020-01-02 | 日産自動車株式会社 | Method for manufacturing cylinder head, and cylinder head rough material |
| WO2022061379A1 (en) * | 2020-09-28 | 2022-03-31 | Innio Jenbacher Gmbh & Co Og | Cylinder head for an internal combustion engine |
-
1992
- 1992-03-13 JP JP04054893A patent/JP3109222B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017113766A (en) * | 2015-12-22 | 2017-06-29 | 株式会社豊田中央研究所 | Laser processing apparatus, laser processing method, optical system, and padding finished article |
| WO2017110241A1 (en) * | 2015-12-22 | 2017-06-29 | 株式会社豊田中央研究所 | Laser processing device, laser processing method, optical system, and built-up item |
| JP2019157837A (en) * | 2018-03-16 | 2019-09-19 | トヨタ自動車株式会社 | cylinder head |
| WO2020003462A1 (en) * | 2018-06-28 | 2020-01-02 | 日産自動車株式会社 | Method for manufacturing cylinder head, and cylinder head rough material |
| CN112368472A (en) * | 2018-06-28 | 2021-02-12 | 日产自动车株式会社 | Method for producing cylinder head and cylinder head blank |
| JPWO2020003462A1 (en) * | 2018-06-28 | 2021-07-01 | 日産自動車株式会社 | Cylinder head manufacturing method and cylinder head rough material |
| CN112368472B (en) * | 2018-06-28 | 2022-06-03 | 日产自动车株式会社 | Method for producing cylinder head and cylinder head blank |
| US11471937B2 (en) | 2018-06-28 | 2022-10-18 | Nissan Motor Co., Ltd. | Method for manufacturing cylinder head, and semimanufactured cylinder head |
| WO2022061379A1 (en) * | 2020-09-28 | 2022-03-31 | Innio Jenbacher Gmbh & Co Og | Cylinder head for an internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3109222B2 (en) | 2000-11-13 |
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