JPH01321076A - Method of preventing crack of cylinder head - Google Patents
Method of preventing crack of cylinder headInfo
- Publication number
- JPH01321076A JPH01321076A JP15607288A JP15607288A JPH01321076A JP H01321076 A JPH01321076 A JP H01321076A JP 15607288 A JP15607288 A JP 15607288A JP 15607288 A JP15607288 A JP 15607288A JP H01321076 A JPH01321076 A JP H01321076A
- Authority
- JP
- Japan
- Prior art keywords
- cylinder head
- heating
- welding
- cooling
- hole
- 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
- 238000000034 method Methods 0.000 title claims description 9
- 238000003780 insertion Methods 0.000 claims abstract description 11
- 230000037431 insertion Effects 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 11
- 239000000446 fuel Substances 0.000 claims abstract description 10
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 238000003466 welding Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 12
- 238000001816 cooling Methods 0.000 abstract description 6
- 230000002950 deficient Effects 0.000 abstract description 2
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 abstract 2
- 230000007423 decrease Effects 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000007769 metal material Substances 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000007689 inspection Methods 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F2001/248—Methods for avoiding thermal stress-induced cracks in the zone between valve seat openings
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、熱疲労による亀裂を防止し得るようにしたシ
リンダヘッドの亀裂防止方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for preventing cracks in a cylinder head that can prevent cracks caused by thermal fatigue.
［従来の技術］
ディーゼルエンジンのシリンダヘッドは、加熱、冷却を
繰返し受ける結果、圧縮力と引張力を繰返し受け、その
ため熱疲労による亀裂を生じ、この亀裂は特にシリンダ
ヘッド下面の吸排気孔間及び燃料の噴射室挿入孔相互間
に多く発生する。[Prior Art] As a result of being repeatedly heated and cooled, the cylinder head of a diesel engine is repeatedly subjected to compressive and tensile forces, which causes cracks due to thermal fatigue. These cracks occur particularly between the intake and exhaust holes on the lower surface of the cylinder head, and between the fuel and air intake holes. This often occurs between the injection chamber insertion holes.
上述の熱疲労による亀裂を防止するため、従来は第２図
に示すように吸気孔２、排気孔３、燃料噴射室挿入孔４
を設けた軟鋼製で圧さ７ｆｆｌＩ１１程度の眼鏡型の鋳
ぐるみピース５をシリンダヘッド１に設けた凹所に嵌合
し、溶着させていた。In order to prevent the above-mentioned cracks due to thermal fatigue, conventionally the intake hole 2, the exhaust hole 3, and the fuel injection chamber insertion hole 4 have been
A spectacle-shaped cast piece 5 made of mild steel and having a pressure of about 7fflI11 was fitted into a recess provided in the cylinder head 1 and welded.
［発明が解決しようとする課題］
しかしながら、上述のシリンダヘッドでは、（ｉ）
鋳ぐるみピース５のシリンダヘッドｌに対する溶着が不
十分なものが生じることがある、（ｉ） 鋳ぐるみピ
ース５の取付は及び検査のため、製造、検査工数が増大
し、コストアップを招来する、
等の問題があった。[Problem to be solved by the invention] However, in the above cylinder head, (i)
In some cases, the welding of the cast piece 5 to the cylinder head l may be insufficient; (i) The mounting and inspection of the cast piece 5 increases manufacturing and inspection man-hours, leading to an increase in costs; There were other problems.
本発明は上述の実情に鑑み、シリンダヘッドｌの強度、
靭性等の機械的性質の改善、特に孔２．３．４間の部分
に要求される耐熱、耐亀裂性の改善を図ることを目的と
してなしたものである。In view of the above-mentioned circumstances, the present invention has been developed to improve the strength of the cylinder head l.
This was done for the purpose of improving mechanical properties such as toughness, especially the heat resistance and crack resistance required for the area between holes 2, 3, and 4.
［課題を解決するための手段］
本発明は、シリンダヘッドの吸気孔及び排気孔並に燃料
噴射室挿入孔の開口した面の加熱、冷却を繰返される個
所に、Ｆｅ−３５±３％Ｎｉの肉盛材を肉盛溶接するも
のである。[Means for Solving the Problems] The present invention provides a method of applying Fe-35±3% Ni to the open surfaces of the intake and exhaust holes of the cylinder head and the fuel injection chamber insertion hole, which are repeatedly heated and cooled. This is for overlay welding of overlay materials.
［作 用］
シリンダヘッドの吸気孔、排気孔、燃料噴射室挿入孔間
にＦｅ−３５±３％Ｎｉ肉盛材により肉盛溶接が行われ
るため、シリンダヘッドの吸気孔、排気孔、燃料噴射室
挿入孔間の加熱、冷却が抑えられ、従って、シリンダヘ
ッドの熱疲労亀裂が著しく減少する。[Function] Overlay welding is performed using Fe-35±3% Ni overlay material between the intake hole, exhaust hole, and fuel injection chamber insertion hole of the cylinder head, so the intake hole, exhaust hole, and fuel injection chamber insertion hole of the cylinder head are Heating and cooling between the chamber insertion holes is suppressed, and therefore thermal fatigue cracks in the cylinder head are significantly reduced.
［実 施 例］ 以下、本発明の実施例を図面を参照しつつ説明する。[Example] Embodiments of the present invention will be described below with reference to the drawings.
第１図（イ）〜（／＜）は本発明の一実施例である。FIG. 1(a) to (/<) show an embodiment of the present invention.
第１図（イ）に示すように、シリンダヘッド１の下面に
吸気孔２及び排気孔３並に燃料噴射室挿入孔４を設け、
該孔２，３．４間の熱疲労による亀裂を生じ易い部分を
所定の範囲及び深さで工作機械等により掘って深さｈが
５〜７ｍｍ程度の凹み９を設ける。As shown in FIG. 1(a), an intake hole 2, an exhaust hole 3, and a fuel injection chamber insertion hole 4 are provided on the lower surface of the cylinder head 1,
A recess 9 having a depth h of about 5 to 7 mm is formed by digging a portion between the holes 2 and 3.4 where cracks are likely to occur due to thermal fatigue using a machine tool or the like in a predetermined range and depth.
次に、シリンダヘッド１を第１図（ロ）に示すように加
熱炉６内へ入れ、シリンダヘッド１全体を２６０〜３２
０℃程度に加熱（均熱）した後加熱炉６から取出し、次
に凹み９の部分をトーチ１０で５４０〜５７０℃に局部
予熱しながら、第１図（ハ）に示すように、凹み９の部
分を肉盛材７により溶接し、肉盛り８を行う。肉盛材７
としては、Ｐａ−３５％Ｎｉを基本としたもの、例えば
球状黒鉛鋳鉄のように、熱膨張係数がＮｉ３５％付近で
最小となるものを用いる。ただし、肉盛材７は、Ｎｉが
Ｆｅ−３５±３％程度の範囲なら、熱膨張係数が小さく
使用可能である。Next, the cylinder head 1 is placed into the heating furnace 6 as shown in FIG.
After heating (soaking) to about 0°C, take it out from the heating furnace 6, and then heat the recess 9 locally to 540 to 570°C with a torch 10, as shown in Figure 1 (C). Weld the part with overlay material 7 and perform overlay 8. Overlay material 7
For example, a material based on Pa-35% Ni, such as spheroidal graphite cast iron, whose coefficient of thermal expansion is minimum near 35% Ni is used. However, the overlay material 7 has a small coefficient of thermal expansion and can be used if the Ni content is in the range of approximately Fe-35±3%.
肉盛り８後、シリンダヘッドｌを再び加熱炉６へ入れて
５５０±５０℃に加熱した後加熱炉６内で徐冷し、しか
る後取出して機械加工により肉盛り８部の突出面を切削
して平らに仕上げる。After the build-up 8, the cylinder head l was put into the heating furnace 6 again and heated to 550±50°C, then slowly cooled in the heating furnace 6, and then taken out and the protruding surface of the build-up 8 part was cut by machining. Finish it flat.
上述のように加工したシリンダヘッド１をエンジンに用
いた場合、シリンダヘッド１の孔２゜３．４間の強度、
靭性等の機械的性質が改善され、シリンダヘッドｌの孔
２．３．４間の加熱、冷却による膨張、収縮が抑えられ
る。このため、シリ ４ンダヘツドｌの孔２．３．４
間の熱疲労亀裂が著しく減少する。When the cylinder head 1 processed as described above is used in an engine, the strength between the holes 2° and 3.4 of the cylinder head 1,
Mechanical properties such as toughness are improved, and expansion and contraction due to heating and cooling between the holes 2, 3, and 4 of the cylinder head 1 is suppressed. For this reason, the hole 2.3.4 of the cylinder head l
Thermal fatigue cracking between the two is significantly reduced.
又溶接であるため不良品が生じるおそれが少く、歩留り
が向上し、しかも製造、検査工数の減少によりコストダ
ウンを図ることができる。Furthermore, since it is welded, there is less risk of producing defective products, improving yield, and reducing manufacturing and inspection man-hours, thereby reducing costs.
なお、本発明のシリンダヘッドの亀裂防止方法は、上述
の実施例にのみ限定されるものではなく、本発明の要旨
を逸脱しない範囲内において種々変更を加え得ることは
勿論である。It should be noted that the method for preventing cracks in a cylinder head of the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.
［発明の効果コ
以上説明したように、本発明のシリンダヘッドの亀裂防
止方法によれば、シリンダヘッドの吸気孔、排気孔、燃
料噴射室挿入孔間の加熱、冷却による膨張、収縮が抑制
されるため、シリンダヘッド孔間の熱疲労亀裂が著しく
減少し、従ってシリンダヘッドの寿命が長期間となり、
且つ安全性か向上し、しかも歩留りの向上やコストダウ
ンを図ることかできる、等種々の優れた効果を奏し得る
。[Effects of the Invention] As explained above, according to the method for preventing cracks in a cylinder head of the present invention, expansion and contraction due to heating and cooling between the intake hole, exhaust hole, and fuel injection chamber insertion hole of the cylinder head are suppressed. As a result, thermal fatigue cracks between the cylinder head holes are significantly reduced, resulting in a longer cylinder head life.
In addition, various excellent effects can be achieved, such as improved safety, improved yield, and reduced costs.
第１図（イ）〜（ハ）は本発明のシリンダヘッドの亀裂
防止方法を実施するための手順を示す説明図、第２図は
従来のシリンダヘッドの説明図である。
図中１はシリンダヘッド、２は吸気孔、３は排気孔、４
は燃料噴射室挿入孔、６は加熱炉、７は肉盛材、８は肉
盛り、９は凹みを示す。FIGS. 1A to 1C are explanatory diagrams showing the procedure for carrying out the method for preventing cracks in a cylinder head according to the present invention, and FIG. 2 is an explanatory diagram of a conventional cylinder head. In the figure, 1 is the cylinder head, 2 is the intake hole, 3 is the exhaust hole, 4
6 indicates a fuel injection chamber insertion hole, 6 indicates a heating furnace, 7 indicates a build-up material, 8 indicates a build-up, and 9 indicates a recess.
Claims (1)
挿入孔の開口した面の加熱、冷却を繰返される個所に、
Ｆｅ−３５±３％Ｎｉの肉盛材を肉盛溶接することを特
徴とするシリンダヘッドの亀裂防止方法。1) Places that are repeatedly heated and cooled, such as the intake and exhaust holes of the cylinder head and the open surfaces of the fuel injection chamber insertion holes.
A method for preventing cracks in a cylinder head, the method comprising overlay welding Fe-35±3%Ni overlay material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15607288A JPH01321076A (en) | 1988-06-24 | 1988-06-24 | Method of preventing crack of cylinder head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15607288A JPH01321076A (en) | 1988-06-24 | 1988-06-24 | Method of preventing crack of cylinder head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01321076A true JPH01321076A (en) | 1989-12-27 |
Family
ID=15619692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15607288A Pending JPH01321076A (en) | 1988-06-24 | 1988-06-24 | Method of preventing crack of cylinder head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01321076A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011107687A1 (en) * | 2010-03-05 | 2011-09-09 | Peugeot Citroën Automobiles SA | Cylinder head for an internal combustion engine |
| CN103934624A (en) * | 2014-04-29 | 2014-07-23 | 南通迪施有限公司 | Basin cutting and renovation process for borehole-cooling type cylinder cover |
-
1988
- 1988-06-24 JP JP15607288A patent/JPH01321076A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011107687A1 (en) * | 2010-03-05 | 2011-09-09 | Peugeot Citroën Automobiles SA | Cylinder head for an internal combustion engine |
| FR2957120A1 (en) * | 2010-03-05 | 2011-09-09 | Peugeot Citroen Automobiles Sa | INTERNAL COMBUSTION ENGINE HEAD |
| CN103934624A (en) * | 2014-04-29 | 2014-07-23 | 南通迪施有限公司 | Basin cutting and renovation process for borehole-cooling type cylinder cover |
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