JP2996759B2 - Casting method of cast-in pipe in cylinder cooled liner for diesel engine - Google Patents
Casting method of cast-in pipe in cylinder cooled liner for diesel engineInfo
- Publication number
- JP2996759B2 JP2996759B2 JP3094811A JP9481191A JP2996759B2 JP 2996759 B2 JP2996759 B2 JP 2996759B2 JP 3094811 A JP3094811 A JP 3094811A JP 9481191 A JP9481191 A JP 9481191A JP 2996759 B2 JP2996759 B2 JP 2996759B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- cast
- casting
- diesel engine
- liner
- 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
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Continuous Casting (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ディーゼル機関用パイ
プ冷却型シリンダライナにおける鋳包みパイプの両端を
気密に封鎖して鋳造する方法、詳しくは、鋳造時の冷却
過程での酸化による、鋳包みパイプ内面の脱炭層の発生
を防止する鋳包みパイプ鋳造方法に関するものである。BACKGROUND OF THE INVENTION The present invention relates to a pie for a diesel engine.
Method for casting by sealing both ends of cast-in pipes in air- cooled cylinder liners in airtight manner, more specifically, casting of cast-in pipes to prevent the occurrence of decarburized layers on the inner surface of cast-in pipes due to oxidation during the cooling process during casting It is about the method.
【０００２】[0002]
【従来の技術】従来、例えば、ディーゼル機関用パイプ
冷却型シリンダライナを鋳造する場合、図４に示すよう
に、鋳包みパイプ（冷却パイプ）１０内にジルコンサン
ドまたはクロマイトサンド等の耐熱性に優れた砂１２を
詰め、両端を自硬性鋳型により封じただけで、鋳型（例
えば砂型）１４内に設置して鋳造している。１６はライ
ナ本体である。このため、鋳込み後の冷却過程で、鋳包
みパイプ１０内へ流入する空気により、鋳包みパイプ１
０内表面が酸化し、厚さ０．２〜２．０mmの脱炭層が鋳
造後の鋳包みパイプ１０内表面に生じていた。2. Description of the Related Art Conventionally, for example, when casting a pipe-cooled cylinder liner for a diesel engine, as shown in FIG. 4, a cast-in pipe (cooling pipe) 10 has excellent heat resistance such as zircon sand or chromite sand. The sand 12 is packed, and both ends are simply sealed with a self-hardening mold. 16 is a liner main body. Therefore, in the cooling process after casting, the air flowing into the cast-in pipe 10 causes the cast-in pipe 1
0 inner surface was oxidized, and a decarburized layer having a thickness of 0.2 to 2.0 mm was formed on the inner surface of the cast-in pipe 10 after casting.
【０００３】従来、脱炭層の発生を防止する技術とし
て、特開平１−２３３０４１号公報に示されるように、
セラミック鋳型とバックアップ鋳型との間に、黒鉛又は
コークス等の炭素物質を充填した精密鋳造用セラミック
鋳型が提案されており、また、特開平１−２３４５５６
号公報に示されるように、鋼管をクロマイジング処理し
た後、少なくとも６００℃までの温度域を３０℃/hr以
上の冷却速度で冷却して、脱炭層の厚さを８００μm以
下とするクロマイズド鋼管の製造方法が提案されてい
る。Conventionally, as a technique for preventing the generation of a decarburized layer, as disclosed in Japanese Patent Application Laid-Open No. 1-233041,
A ceramic mold for precision casting in which a carbon material such as graphite or coke is filled between a ceramic mold and a backup mold has been proposed.
As shown in the publication, after the chromizing treatment of the steel pipe, the temperature range up to at least 600 ° C. is cooled at a cooling rate of 30 ° C./hr or more, and the thickness of the decarburized layer is set to 800 μm or less. Manufacturing methods have been proposed.
【０００４】[0004]
【発明が解決しようとする課題】しかし、これらの公報
には、鋳包みパイプの両端を気密に封鎖するという技術
的思想は何も開示されていない。前述の従来の鋳包みパ
イプ鋳造方法により生じた脱炭層のため、鋳包みパイプ
１０内表面付近の硬さは大きく低下し、このため、鋳包
みパイプ１０内面を起点とする疲労亀裂の発生が容易に
なり、シリンダライナの水漏れ等の事故が発生する原因
となる。However, these publications do not disclose any technical idea of hermetically closing both ends of the cast-in pipe. Due to the decarburized layer generated by the above-described conventional cast-in pipe casting method, the hardness near the inner surface of the cast-in pipe 10 is greatly reduced, so that fatigue cracks starting from the inner surface of the cast-in pipe 10 are easily generated. And an accident such as leakage of water from the cylinder liner may occur.
【０００５】鋳包みパイプ内表面の脱炭層は、鋳造時の
冷却過程で、空気中の酸素によりパイプ内表面付近の炭
素が酸化されるため生じるもので、これを防止するため
には、パイプ内の空気量を少なくし、この酸化反応を抑
える必要がある。この酸化反応は、数十時間に及ぶ凝固
時の冷却過程で起こるため、この間にパイプ内に新たな
空気が外部から流入することを防ぐことが、この脱炭層
の生成を防ぐことについて特に効果がある。本発明は、
ディーゼル機関用パイプ冷却型シリンダライナにおける
鋳包みパイプの脱炭層の発生を防止するためになされた
もので、パイプ両端を金属製の栓又は蓋で溶接等により
封鎖して、パイプ内への鋳造工程での空気流入を遮断す
る鋳包みパイプ鋳造方法を提供することを目的とするも
のである。[0005] The decarburized layer on the inner surface of the cast-in pipe is formed by the oxidation of carbon near the inner surface of the pipe by oxygen in the air during the cooling process during casting. It is necessary to suppress the oxidation reaction by reducing the amount of air in the air. Since this oxidation reaction takes place during the cooling process during solidification for several tens of hours, preventing new air from flowing into the pipe during this period is particularly effective in preventing the formation of this decarburized layer. is there. The present invention
This is made to prevent the decarburization layer of the cast-in pipe in the pipe cooling type cylinder liner for diesel engines.The pipe ends are closed by welding or the like with metal stoppers or lids, and the inside of the pipe is It is an object of the present invention to provide a method for casting a cast-in pipe that blocks air from flowing into a casting process.
【０００６】[0006]
【課題を解決するための手段及び作用】上記の目的を達
成するために、本発明のディーゼル機関用パイプ冷却型
シリンダライナにおける鋳包みパイプの鋳造方法は、図
１〜図３を参照して説明すれば、鋳包みパイプ１０の両
端を鋳型１４中に保持させた後、該パイプ１０の周囲に
溶湯を鋳込んでパイプ１０を鋳包むディーゼル機関用パ
イプ冷却型シリンダライナにおける鋳包みパイプの鋳造
方法において、鋳造時の冷却過程での酸化による鋳包み
パイプ内面の脱炭層の発生を防止するために、鋳包みパ
イプ１０の両端を、金属製の栓２０又は蓋を用い溶接又
はネジ込み等により気密に封鎖してパイプ１０内への空
気の流入を遮断した後、パイプ１０を鋳包むことを特徴
としている。空気の流入口である鋳包みパイプ１０両端
を、金属製の栓２０又は蓋を用いて塞ぎ、これを溶接、
ネジ込み等により固定して鋳型（例えば砂型）１４内に
設置して鋳造を行なうと、冷却時の空気の流入を完全に
遮断し、酸化反応による脱炭層の形成を抑えることがで
きる。SUMMARY OF THE INVENTION In order to achieve the above object, a pipe cooling type for a diesel engine according to the present invention is provided.
A method for casting a cast-in pipe in a cylinder liner will be described with reference to FIGS. 1 to 3. After holding both ends of the cast-in pipe 10 in a mold 14, a molten metal is cast around the pipe 10. For a diesel engine that casts a pipe 10
In the method of casting a cast-in pipe in an Ip cooling type cylinder liner , cast-in by oxidation during the cooling process during casting
In order to prevent the formation of a decarburized layer on the inner surface of the pipe, both ends of the cast-in pipe 10 are hermetically closed by welding or screwing using a metal stopper 20 or a lid to prevent air from flowing into the pipe 10. After the cutoff, the pipe 10 is cast-in. Both ends of the cast-in pipe 10 serving as an air inlet are closed with a metal stopper 20 or a lid, and this is welded.
When casting is carried out by fixing it by screwing or the like and installing it in a mold (eg, sand mold) 14, the inflow of air during cooling can be completely blocked, and the formation of a decarburized layer due to an oxidation reaction can be suppressed.
【０００７】この際、鋳包みパイプ１０内に封ぜられる
空気による酸化を防ぐために、鋳包みパイプ１０内にジ
ルコンサンド、クロマイトサンド等の耐熱性に優れた砂
を詰めることや、栓２０又は蓋の溶接やネジ込み時に、
鋳包みパイプ１０内の空気を、アルゴン、窒素等の不活
性ガスに置換しておくことや、鋳包みパイプ１０内を真
空又は略真空にしておくこと等の工程を付加するのが望
ましい。At this time, in order to prevent oxidation due to air sealed in the cast-in pipe 10, the cast-in pipe 10 is filled with sand having excellent heat resistance such as zircon sand, chromite sand, etc. When welding or screwing
It is desirable to add a process such as replacing the air in the cast-in pipe 10 with an inert gas such as argon or nitrogen, or keeping the inside of the cast-in pipe 10 in a vacuum or substantially vacuum.
【０００８】[0008]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。図１は、ディーゼル機関用パイプ冷却型シリンダ
ライナを鋳造している状態を示す断面説明図、図２は、
図１において鎖線円で囲まれた部分の拡大図、図３は、
図１及び図２における鋳包みパイプ及びその周辺部の拡
大図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional explanatory view showing a state in which a pipe-cooled cylinder liner for a diesel engine is being cast, and FIG.
FIG. 3 is an enlarged view of a portion surrounded by a chain line circle in FIG.
FIG. 3 is an enlarged view of the cast-in pipe and its peripheral portion in FIGS. 1 and 2.
【０００９】鋳造は、鋳型１４、例えば砂を用いて造型
した砂型内で行なわれ、鋳包みパイプ（冷却パイプ）１
０は、その両端を砂型の中に保持されている。鋳包みパ
イプ１０は、一例として、略Ｕ字形、略Ｖ字形等に形成
された鋼製のものである。鋳包みパイプ１０の両端の開
口部には、金属製、例えば鉄製の栓２０又は蓋をすみ肉
溶接するか、又はネジ込み等により設けて、パイプ両端
を気密にかつ強固に塞ぎ、これにより鋳造時の空気の流
入を遮断する。鋳包みパイプ１０の中空部２２には、ジ
ルコンサンド、クロマイトサンド等の耐熱性に優れた砂
を充填したり、アルゴン、窒素等の不活性ガスを置換・
充填したり、さらには、中空部２２を真空状態もしくは
略真空状態にすることもある。湯口２４、２６から鋳込
まれた溶湯は、湯道２８、３０を通ってライナ本体１６
の部分と押し湯部３２を満たし、このとき、パイプ１０
はライナ本体１６内に鋳包まれる。なお、図３における
破線は、切削加工後のライナ形状を示している。The casting is performed in a mold 14, for example, a sand mold formed using sand, and the cast-in pipe (cooling pipe) 1
0 has its both ends held in a sand mold. The cast-in pipe 10 is, for example, a steel pipe formed in a substantially U-shape, a substantially V-shape, or the like. At the openings at both ends of the cast-in pipe 10, metal, for example, an iron stopper 20 or a lid is provided by fillet welding or screwing, etc., so that both ends of the pipe are airtightly and firmly closed. Cut off the inflow of air at the time. The hollow part 22 of the cast-in pipe 10 is filled with sand having excellent heat resistance such as zircon sand and chromite sand, or is replaced with an inert gas such as argon or nitrogen.
It may be filled, or the hollow portion 22 may be in a vacuum state or a substantially vacuum state. The molten metal cast from the gates 24 and 26 passes through the runners 28 and 30 and the liner main body 16.
And the hot water part 32 are filled.
Is cast in the liner body 16. In addition, the broken line in FIG. 3 has shown the liner shape after cutting.
【００１０】図５は、図４に示す従来方法により鋳造し
た場合の鋳包みパイプ内面の金属組織の顕微鏡写真（倍
率４０倍）を示している。図５から、従来方法では、
０．２mm以上の脱炭層が生じていることがわかる。一
方、図６は、本発明によるパイプ両端封鎖鋳造法により
鋳造した場合の鋳包みパイプ内面の金属組織の顕微鏡写
真（倍率４０倍）を示している。なお、鋳造条件は、図
５の場合と同様であった。図６から、本発明の方法で
は、脱炭層が０．０２mm以下に抑えられていることがわ
かる。FIG. 5 shows a micrograph (magnification: 40 ×) of the metal structure on the inner surface of the cast-in pipe when cast by the conventional method shown in FIG. From FIG. 5, in the conventional method,
It can be seen that a decarburized layer of 0.2 mm or more is generated. On the other hand, FIG. 6 shows a micrograph (magnification: 40 ×) of the metal structure on the inner surface of the cast-in pipe when casting is performed by the pipe double-ended sealing casting method according to the present invention. The casting conditions were the same as in FIG. FIG. 6 shows that the decarburized layer is suppressed to 0.02 mm or less in the method of the present invention.
【００１１】[0011]
【発明の効果】本発明は上記のように構成されているの
で、つぎのような効果を奏する。 （１） 従来の鋳造方法では、鋳包みパイプの内面に、
０．２〜２．０mmの脱炭層が生じており、疲労寿命は脱
炭層を除去した場合と比較して１／２〜１／４となって
いたが、本発明方法による鋳造では、鋳包みパイプの内
面に発生する脱炭層は０．０２mm以下であり、疲労寿命
の低下も殆ど認められない。As described above, the present invention has the following effects. (1) In the conventional casting method, the inner surface of the cast-in pipe is
A decarburized layer of 0.2 to 2.0 mm was formed, and the fatigue life was 1/2 to 1/4 as compared with the case where the decarburized layer was removed. The decarburized layer generated on the inner surface of the pipe is 0.02 mm or less, and the fatigue life is hardly reduced.
【図１】本発明の一実施例を示すもので、ディーゼル機
関用パイプ冷却型シリンダライナを鋳造している状態を
示す断面説明図である。FIG. 1 is a cross-sectional explanatory view showing one embodiment of the present invention and showing a state in which a pipe-cooled cylinder liner for a diesel engine is being cast.
【図２】図１において、鎖線円で囲まれた部分の拡大図
である。FIG. 2 is an enlarged view of a portion surrounded by a chain line circle in FIG.
【図３】図１及び図２における鋳包みパイプ及びその周
辺部の拡大図である。FIG. 3 is an enlarged view of the cast-in pipe and its peripheral portion in FIGS. 1 and 2;
【図４】従来の鋳包みパイプ鋳造方法を示す説明図であ
る。FIG. 4 is an explanatory view showing a conventional cast-in-pipe casting method.
【図５】従来方法により鋳造した場合の鋳包みパイプ内
面の金属組織の顕微鏡写真（倍率４０倍）である。FIG. 5 is a micrograph (magnification: 40) of a metal structure on the inner surface of a cast-in pipe when cast by a conventional method.
【図６】本発明方法により鋳造した場合の鋳包みパイプ
内面の金属組織の顕微鏡写真（倍率４０倍）である。FIG. 6 is a micrograph (magnification: 40) of a metal structure on the inner surface of a cast-in pipe when cast by the method of the present invention.
１０ 鋳包みパイプ １２ 耐熱性に優れた砂 １４ 鋳型（砂型） １６ ライナ本体 ２０ 栓 ２２ 中空部 ２４ 湯口 ２６ 湯口 ２８ 湯道 ３０ 湯道 ３２ 押し湯部 DESCRIPTION OF SYMBOLS 10 Cast-in-pipe 12 Sand excellent in heat resistance 14 Mold (sand mold) 16 Liner body 20 Plug 22 Hollow part 24 Sluice 26 Sluice 28 Sluice 30 Sluice 32 Sluice 32
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−68256（ＪＰ，Ａ) 特開 平２−92447（ＪＰ，Ａ) 特開 平３−189061（ＪＰ，Ａ) 特開 平２−241661（ＪＰ，Ａ) 特開 平３−142057（ＪＰ，Ａ) 特開 昭55−68168（ＪＰ，Ａ) 実開 平１−105064（ＪＰ，Ｕ) 実開 昭56−142860（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) B22D 19/00 F02F 1/10 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-63-68256 (JP, A) JP-A-2-92447 (JP, A) JP-A-3-18961 (JP, A) JP-A-2- 241661 (JP, A) JP-A-3-142057 (JP, A) JP-A-55-68168 (JP, A) JP-A-1-105064 (JP, U) JP-A-56-142860 (JP, U) (58) Field surveyed (Int. Cl. 7 , DB name) B22D 19/00 F02F 1/10
Claims (3)
４）中に保持させた後、該パイプ（１０）の周囲に溶湯
を鋳込んでパイプ（１０）を鋳包むディーゼル機関用パ
イプ冷却型シリンダライナにおける鋳包みパイプの鋳造
方法において、鋳造時の冷却過程での酸化による鋳包みパイプ内面の脱
炭層の発生を防止するために、 鋳包みパイプ（１０）の
両端を、金属製の栓（２０）又は蓋を用い溶接又はネジ
込み等により気密に封鎖してパイプ（１０）内への空気
の流入を遮断した後、パイプ（１０）を鋳包むことを特
徴とするディーゼル機関用パイプ冷却型シリンダライナ
における鋳包みパイプの鋳造方法。1. A method according to claim 1, wherein both ends of the cast-in pipe (10) are connected to a mold (1).
4) After being held in the pipe, the molten metal is cast around the pipe (10) and the pipe (10) is cast-in for a diesel engine.
In the casting method of the cast- in pipe in the IP cooling type cylinder liner , removal of the inner surface of the cast-in pipe by oxidation during the cooling process during casting.
In order to prevent the formation of a coal layer, both ends of the cast-in pipe (10) are hermetically sealed by welding or screwing using a metal stopper (20) or a lid, and air is introduced into the pipe (10). A pipe-cooled cylinder liner for a diesel engine , wherein the pipe (10) is cast-in after shutting off the inflow.
Casting method of the insert casting pipe in.
ド、クロマイトサンド等の耐熱性に優れた砂を詰めた
後、パイプ（１０）の両端を気密に封鎖することを特徴
とする請求項１記載のディーゼル機関用パイプ冷却型シ
リンダライナにおける鋳包みパイプの鋳造方法。2. The cast-in pipe (10) is filled with sand having excellent heat resistance such as zircon sand and chromite sand, and then both ends of the pipe (10) are hermetically closed. Pipe cooling type system for diesel engine described
A method of casting a cast-in pipe in a liner liner .
ン、窒素等の不活性ガスに置換するか、又は鋳包みパイ
プ（１０）内を真空もしくは略真空にして、パイプ（１
０）の両端を気密に封鎖することを特徴とする請求項１
記載のディーゼル機関用パイプ冷却型シリンダライナに
おける鋳包みパイプの鋳造方法。3. The pipe (1) is replaced with an inert gas such as argon or nitrogen, or the inside of the cast-in pipe (10) is evacuated or substantially evacuated.
2. Both ends of (0) are hermetically sealed.
The pipe cooling type cylinder liner for diesel engine described
Casting method of the definitive insert casting pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3094811A JP2996759B2 (en) | 1991-04-01 | 1991-04-01 | Casting method of cast-in pipe in cylinder cooled liner for diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3094811A JP2996759B2 (en) | 1991-04-01 | 1991-04-01 | Casting method of cast-in pipe in cylinder cooled liner for diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04305351A JPH04305351A (en) | 1992-10-28 |
| JP2996759B2 true JP2996759B2 (en) | 2000-01-11 |
Family
ID=14120442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3094811A Expired - Lifetime JP2996759B2 (en) | 1991-04-01 | 1991-04-01 | Casting method of cast-in pipe in cylinder cooled liner for diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2996759B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1076357A (en) * | 1996-09-04 | 1998-03-24 | Toyota Motor Corp | Method and device for casting in cylindrical body |
| JP6281617B2 (en) * | 2016-09-21 | 2018-02-21 | 日本軽金属株式会社 | Manufacturing method of caliper for disc brake |
| CN110814282B (en) * | 2019-10-30 | 2021-09-21 | 本溪钢铁（集团）机械制造有限责任公司 | Method for preparing iron casting with cast-in steel pipe |
-
1991
- 1991-04-01 JP JP3094811A patent/JP2996759B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04305351A (en) | 1992-10-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4598762B2 (en) | Gray cast iron for engine cylinder block and cylinder head | |
| US4021910A (en) | Method for treating superalloy castings | |
| SU1066464A3 (en) | Process and mold for making cooling element of metallurgical furnace | |
| JP2996759B2 (en) | Casting method of cast-in pipe in cylinder cooled liner for diesel engine | |
| JP6043075B2 (en) | Cast turbine casing and nozzle diaphragm preform | |
| JP2002178129A (en) | Mold for casting | |
| CN108927504A (en) | A kind of casting technique of aluminium alloy large-sized engine crankcase part | |
| JPS5914294B2 (en) | casting mold | |
| JP3714135B2 (en) | Cooling pipe casting method | |
| JP2565327Y2 (en) | Gate member of hot water supply channel in low pressure casting machine | |
| JP3681292B2 (en) | Gas bubbling method for crucible induction furnace | |
| JPS6393876A (en) | Cylinder head for internal-combustion engine made of cast iron | |
| JPH0215866A (en) | Manufacture of cylinder head | |
| SU594650A1 (en) | Method of preparing reinforcing inserts | |
| JPH02286821A (en) | Manufacture of auxiliary combustion chamber of diesel engine | |
| CN117047034A (en) | Loosening and shrinkage cavity control method for large-size equiaxed crystal superalloy castings | |
| JP2775885B2 (en) | Cylinder head and method of manufacturing the same | |
| KR890001637B1 (en) | Aluminum-diffusion coated steel pipe gating system | |
| JPS574352A (en) | Method for preventing sulfurization of cast steel casting | |
| CN115491680A (en) | Method for preventing stainless steel pipe in aluminum alloy casting from rusting | |
| JPH01299758A (en) | Vacuum induction melting/casting method | |
| JPH10314921A (en) | Cooling pipe cast-in casting steel product and its manufacture | |
| JPH0521666B2 (en) | ||
| CN117505824A (en) | Casting process of high-strength high-tightness cylinder cover | |
| JPH03106553A (en) | Manufacture of hollow member having heat insulating ceramic covering layer on inside surface |