JPH02192851A - Method for casting cylinder block - Google Patents
Method for casting cylinder blockInfo
- Publication number
- JPH02192851A JPH02192851A JP884989A JP884989A JPH02192851A JP H02192851 A JPH02192851 A JP H02192851A JP 884989 A JP884989 A JP 884989A JP 884989 A JP884989 A JP 884989A JP H02192851 A JPH02192851 A JP H02192851A
- Authority
- JP
- Japan
- Prior art keywords
- cylinder block
- mold
- inner circumferential
- casting
- styrene
- 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
- 238000005266 casting Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 13
- 239000004576 sand Substances 0.000 claims description 10
- 230000005855 radiation Effects 0.000 claims description 7
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 abstract description 40
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 abstract description 2
- 239000006260 foam Substances 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 239000003110 molding sand Substances 0.000 abstract 2
- 239000000956 alloy Substances 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 238000000465 moulding Methods 0.000 abstract 1
- 239000013078 crystal Substances 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 239000006082 mold release agent Substances 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
ＣＭ業上の利用分野）
本発明は、チラースリーブを利用したシリンダブロック
の鋳造方法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Application in CM Industry) The present invention relates to a method for casting a cylinder block using a chiller sleeve.
（従来の技術）
従来、シリンダブロックの鋳造を消失模型鋳造法により
行なうことがある。この消失模型鋳造法では被鋳造物で
あるシリンダブロックと同等の外形をなす発泡スチレン
を砂型内に埋込み、その上で、所定の溶湯を注入する。(Prior Art) Conventionally, cylinder blocks are sometimes cast by an investment casting method. In this vanishing model casting method, styrene foam having the same external shape as the cylinder block to be cast is embedded in a sand mold, and then a predetermined amount of molten metal is poured into the sand mold.
この場合、溶湯は発泡スチレンを焼却し、同スチレンの
占めていた空間内に供給され、発泡スチレンと同等形状
の鋳物が鋳造される。In this case, the molten metal incinerates the foamed styrene and is supplied into the space occupied by the styrene, and a casting having the same shape as the foamed styrene is cast.
他方、鋳物の軽量化を図る目的でハイ・シリコンアルミ
合金（Ｓｉの含有率：１６〜１８％）、例えばＡ３９０
を溶湯として用いて、シリンダブロック等を鋳造するこ
とが行なわれている。On the other hand, high-silicon aluminum alloys (Si content: 16-18%), such as A390, are used to reduce the weight of castings.
Cylinder blocks and the like are cast using molten metal.
（発明が解決しようとする課題）
ところで５このようなシリンダブロックの鋳造を消失模
型鋳造法により行なった場合、溶湯の鋳込み時において
、熱容量の大きい金型を用いての鋳造の場合と比べて、
その溶湯の冷却速度が遅くなり、溶湯の凝固が除々に進
むに応じて初晶Ｓｉが成長し、粗大化し易い。(Problems to be Solved by the Invention) By the way, 5. When such a cylinder block is cast by the disappearance model casting method, when pouring the molten metal, compared to the case of casting using a mold with a large heat capacity,
As the cooling rate of the molten metal slows down and solidification of the molten metal gradually progresses, primary Si crystals tend to grow and become coarse.
この場合、シリンダ内周壁面間に充填されている鋳砂は
、その量が比較的少なく、しかも、この位置の鋳砂の放
熱域は限られ、放熱性が悪く、シリンダ内周壁面からの
熱を所要速度で放散させることのできるだけの量を確保
されていない。In this case, the amount of casting sand filled between the inner circumferential walls of the cylinder is relatively small, and the heat dissipation area of the casting sand at this position is limited, resulting in poor heat dissipation. is not secured in sufficient quantity to dissipate at the required rate.
このような鋳造条件下では、鋳物の表面の初晶Ｓｉが粗
大化し、鋳物の表面のセメンタイト化は十分になされな
い。この結果、耐摩耗性の低いシリンダ内壁面が形成さ
れることとなり、シリンダブロックとして耐久性の低い
ものと成り、問題と成っている。Under such casting conditions, the primary crystal Si on the surface of the casting becomes coarse, and the surface of the casting is not sufficiently cementitized. As a result, a cylinder inner wall surface with low wear resistance is formed, resulting in a cylinder block with low durability, which is a problem.
そこで、本発明の目的は、シリンダブロックの内周壁面
の耐摩耗性を強化できるシリンダブロックの鋳造方法を
提供することにある。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for casting a cylinder block that can enhance the wear resistance of the inner peripheral wall surface of the cylinder block.
（課題を解決するための手段）
上述の目的を達成するために、本発明方法では、鋳造さ
れるシリンダブロックの内周壁面との対向部分が筒部と
して形成されると共に同筒部の内周面には中心方向に放
熱フィンが多数突設され、且つ全体は上記シリンダブロ
ック用の消失模型鋳造型内に一体的に取付けられたチラ
ースリーブを用い、上記チラースリーブ付きの消失模型
鋳造型を鋳砂内に埋め込む型込め工程と、上記消失模型
鋳造型内に溶湯を供給する鋳込み工程と、鋳造されたシ
リンダブロック内より上記チラースリーブを抜き取る引
抜き工程とをこの順に行なうことを特徴としている。(Means for Solving the Problems) In order to achieve the above-mentioned object, in the method of the present invention, the part facing the inner peripheral wall surface of the cylinder block to be cast is formed as a cylindrical part, and the inner periphery of the cylinder block is formed as a cylindrical part. The surface has a large number of radiation fins protruding toward the center, and a chiller sleeve is installed integrally within the above-mentioned investment model casting mold for the cylinder block, and the above-mentioned investment model casting mold with the chiller sleeve is cast. It is characterized in that a mold embedding step in which the chiller sleeve is embedded in sand, a casting step in which molten metal is supplied into the disappearing model casting mold, and a drawing step in which the chiller sleeve is pulled out from within the cast cylinder block are performed in this order.
（作 用）
シリンダブロックの内周壁面の熱を回部と対向する筒部
で受は取ると共に、これを筒部の内周面より中心方向に
延出する放熱フィン側に拡散出来、シリンダブロックの
内周壁面を急冷することができる。(Function) The heat on the inner circumferential wall of the cylinder block can be absorbed by the cylindrical section facing the rotating section, and can be diffused to the radiation fin side extending toward the center from the inner circumferential surface of the cylindrical section. The inner circumferential wall surface of the can be rapidly cooled.
（実 施 例）
ここでは、まず、本発明に用いるチラースリーブ付きの
消失模型鋳造型を説明する。(Example) First, a loss-making model casting mold with a chiller sleeve used in the present invention will be described.
第１図及び第２図において、チラースリーブ１は鋼製で
あり、筒部２とその内周面より延出する多数の放熱フィ
ン３とで構成され、全体は発泡スチレンからなるシリン
ダブロック型（以後単にスチレン型と記す）４内に離型
剤Ａを塗布された上で一体的に組み込まれている。In FIGS. 1 and 2, a chiller sleeve 1 is made of steel and is composed of a cylindrical portion 2 and a number of heat dissipating fins 3 extending from the inner circumferential surface of the cylindrical portion 2. The entire chiller sleeve 1 is in the form of a cylinder block made of expanded styrene. (hereinafter simply referred to as a styrene mold) 4 is coated with a mold release agent A and then integrated into the mold.
スチレン型４は被鋳造物である内燃機関のシリンダブロ
ックとほぼ同等の外形をなしており、各シリンダ相当部
（気筒数に相当する各シリンダ相当部の内の１つのみを
第１図に示した）４０１の内周面に、各チラースリーブ
の筒部２の外周面が接着されている。The styrene mold 4 has an external shape that is almost the same as the cylinder block of an internal combustion engine, which is the object to be cast. The outer circumferential surface of the cylindrical portion 2 of each chiller sleeve is adhered to the inner circumferential surface of the chiller sleeve 401.
チラースリーブの筒部２の長さＬはシリンダブロックの
シリンダの全長Ｌ１より長さａだけ長く形成され、その
突出部２０１は鋳造後の引抜き作業に用いるよう構成さ
れている。The length L of the cylindrical portion 2 of the chiller sleeve is formed to be longer than the total length L1 of the cylinder of the cylinder block by a length a, and the protruding portion 201 thereof is configured to be used for a drawing operation after casting.
筒部２の内周面２０２からは多数の放熱フィン３が筒部
２の中心線悲方向に延出形成されている。A large number of radiation fins 3 are formed extending from the inner circumferential surface 202 of the cylindrical portion 2 in the direction of the center line of the cylindrical portion 2 .
即ち、各放熱フィン３は所定厚さで所定幅の板状をなし
、中心線Ｑ方向に沿って互いに並列状に配設されている
。That is, each radiation fin 3 has a plate shape with a predetermined thickness and a predetermined width, and is arranged in parallel with each other along the center line Q direction.
このようなチラースリーブはその筒部２の外周面に離型
剤Ａを塗布された上でスチレン型４内の各シリンダ対向
位置に一体的に取付られ、シリンダブロックの鋳造に用
いられる。Such a chiller sleeve is coated with a mold release agent A on the outer peripheral surface of its cylindrical portion 2, and is integrally attached to a position facing each cylinder in a styrene mold 4, and is used for casting a cylinder block.
ここで、第３図と共に、シリンダブロックの鋳造方法を
説明する。Here, a method for casting a cylinder block will be explained with reference to FIG.
まず、鋳枠５内に、第１図に示したスチレン型４をセッ
トし、鋳砂を供給し、型込め工程を行なう。この場合、
スチレン型４内のチラースリーブの各放熱フィン３間に
も鋳砂が充填されるよう、振動機６が使用されることが
望ましい。First, the styrene mold 4 shown in FIG. 1 is set in the flask 5, casting sand is supplied, and a mold filling process is performed. in this case,
It is desirable that the vibrator 6 be used so that the spaces between the heat radiation fins 3 of the chiller sleeve in the styrene mold 4 are also filled with casting sand.
この後、ハイ・シリコンアルミ合金であるＡ３９０の溶
湯を湯ロアより注湯し、鋳込み工程を行なう。この時、
溶湯は発泡スチレンの占めていた空間内に供給され、ス
チレン型４と同等形状のシリンダブロックが鋳造される
。Thereafter, molten metal A390, which is a high-silicon aluminum alloy, is poured from the lower molten metal to perform a casting process. At this time,
The molten metal is supplied into the space occupied by the expanded styrene, and a cylinder block having the same shape as the styrene mold 4 is cast.
ここで、チラースリーブに対向する部分であるシリンダ
相当部４０１に達した溶湯はその熱を直ちに熱容量の大
きい筒部２に受は取られ、急冷される。しかも、筒部２
自体は多数の放熱フィン３を介して、溶湯からの熱を鋳
砂側に効率良く放散させることができる。特に、放熱フ
ィン３は筒部２から受けた熱を鋳枠５内の上部側に伝達
し、上部側の鋳砂に熱を放散させるように作用すること
ができ、筒部２に熱がこもることを防止出来る。Here, the heat of the molten metal reaching the cylinder-equivalent portion 401, which is the portion facing the chiller sleeve, is immediately received by the cylindrical portion 2 having a large heat capacity and is rapidly cooled. Moreover, the cylindrical part 2
The heat from the molten metal can be efficiently dissipated to the casting sand side via the large number of heat dissipation fins 3. In particular, the heat dissipation fins 3 can act to transmit the heat received from the cylindrical part 2 to the upper side of the flask 5 and dissipate the heat to the casting sand on the upper side, thereby preventing heat from being trapped in the cylindrical part 2. This can be prevented.
このように、シリンダ相当部４０１は直ちに急冷される
ので、その内周壁面のセメンタイト化が十分になされ、
結晶組織内で初晶Ｓｉが粗大化するという不具合を防止
できる。In this way, the cylinder equivalent portion 401 is immediately quenched, so that its inner peripheral wall surface is sufficiently cementitized.
It is possible to prevent the problem of coarsening of primary Si within the crystal structure.
この後、型別がなされ、鋳枠５より鋳造されたシリンダ
ブロックＳが取り出される。更に、このシリンダブロッ
クＳに嵌入されているチラースリーブがその突出部２０
１を引抜き手段８により係止され、引抜かれ、引き抜き
工程か実施される。Thereafter, mold separation is performed, and the cast cylinder block S is taken out from the flask 5. Furthermore, the chiller sleeve fitted into this cylinder block S has its protrusion 20
1 is locked and pulled out by the pulling means 8, and the pulling process is carried out.
この後、所要の後処理がなされ、シリンダブロックＳが
完成する。Thereafter, necessary post-processing is performed, and the cylinder block S is completed.
このようにして鋳造されたシリンダブロックＳは、その
内周壁面の結晶組織が十分にセメンタイト化されている
ので、その耐摩耗性を確保出来、その耐久性を向上させ
ることができる。Since the cylinder block S cast in this manner has a sufficiently cementite crystal structure on its inner circumferential wall surface, its wear resistance can be ensured and its durability can be improved.
（発明の効果）
このように、本発明によるシリンダブロックの鋳造方法
では、被鋳造物の内周壁面を急冷でき、その内周壁面の
セメンタイト化を確実に図れ、その内周壁面の耐摩耗性
の向上を図り、鋳物の耐久性の向上を図ることができる
。特に、消失模型鋳造型と一体化されたチラースリーブ
を用いるので、鋳造時の作業性が良い。(Effects of the Invention) As described above, in the cylinder block casting method according to the present invention, the inner circumferential wall surface of the object to be cast can be rapidly cooled, the inner circumferential wall surface can be reliably cementitized, and the wear resistance of the inner circumferential wall surface can be improved. It is possible to improve the durability of the casting. Particularly, since a chiller sleeve integrated with the disappearing model casting mold is used, workability during casting is good.
第１図は本発明の一実施例としてのチラースリーブを取
付けたスチレン型の断面図、第２図は同上チラースリー
ブの斜視図、第３図（ａ）、（ｂ）＝（ｃ）、（ｄ）は
同上スチレン型によるシリンダブロックの鋳造工程説明
図である。
１・・・チラースリーブ、２・・・筒部、３・・・放熱
フィン、４・・・スチレン型、４０１・・・シリンダ相
当部、Ｓ・・・シリンダブロック、
手続補正帯
（自発）
（ス）
（Ｃン
処
■
平成
年
月
日Fig. 1 is a sectional view of a styrene mold equipped with a chiller sleeve as an embodiment of the present invention, Fig. 2 is a perspective view of the same chiller sleeve, and Figs. 3 (a), (b) = (c), ( d) is an explanatory view of the casting process of the cylinder block using the same styrene mold as above. 1... Chiller sleeve, 2... Cylinder part, 3... Radiation fin, 4... Styrene type, 401... Cylinder equivalent part, S... Cylinder block, Procedure correction band (spontaneous) ( ) (C) Date of Heisei
Claims (1)
筒部として形成されると共に同筒部の内周面には中心方
向に放熱フィンが多数突設され、且つ全体は上記シリン
ダブロック用の消失模型鋳造型内に一体的に取付けられ
たチラースリーブを用い、上記チラースリーブ付きの消
失模型鋳造型を鋳砂内に埋め込む型込め工程と、上記消
失模型鋳造型内に溶湯を供給する鋳込み工程と、鋳造さ
れたシリンダブロック内より上記チラースリーブを抜き
取る引抜き工程とをこの順に行なうことを特徴とするシ
リンダブロックの鋳造方法。The part facing the inner circumferential wall surface of the cylinder block to be cast is formed as a cylindrical portion, and the inner circumferential surface of the cylindrical portion is provided with a large number of radiation fins protruding toward the center, and the entire cylinder block is formed of a cylinder block. a mold filling step of embedding the vanishing model casting mold with the chiller sleeve in casting sand using a chiller sleeve integrally attached to the model casting mold; and a casting step of supplying molten metal into the vanishing model casting mold. A method for casting a cylinder block, characterized in that the following steps are performed in this order: and a pulling step of pulling out the chiller sleeve from within the cast cylinder block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP884989A JP2832970B2 (en) | 1989-01-18 | 1989-01-18 | Cylinder block casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP884989A JP2832970B2 (en) | 1989-01-18 | 1989-01-18 | Cylinder block casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02192851A true JPH02192851A (en) | 1990-07-30 |
| JP2832970B2 JP2832970B2 (en) | 1998-12-09 |
Family
ID=11704191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP884989A Expired - Lifetime JP2832970B2 (en) | 1989-01-18 | 1989-01-18 | Cylinder block casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2832970B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1779943A1 (en) * | 2005-10-26 | 2007-05-02 | Honsel GmbH & Co. KG | Method and device for casting light metal crankcases in sand moulds |
| JP2008528292A (en) * | 2005-01-31 | 2008-07-31 | ハイドロ アルミニウム ドイチュラント ゲゼルシャフト ミット ベシュレンクテル ハフツング | Chill molds for casting light metal casting materials and the use of such molds and cast iron materials |
-
1989
- 1989-01-18 JP JP884989A patent/JP2832970B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008528292A (en) * | 2005-01-31 | 2008-07-31 | ハイドロ アルミニウム ドイチュラント ゲゼルシャフト ミット ベシュレンクテル ハフツング | Chill molds for casting light metal casting materials and the use of such molds and cast iron materials |
| EP1779943A1 (en) * | 2005-10-26 | 2007-05-02 | Honsel GmbH & Co. KG | Method and device for casting light metal crankcases in sand moulds |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2832970B2 (en) | 1998-12-09 |
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