JPH01107954A - Lost form pattern casting method - Google Patents
Lost form pattern casting methodInfo
- Publication number
- JPH01107954A JPH01107954A JP26258287A JP26258287A JPH01107954A JP H01107954 A JPH01107954 A JP H01107954A JP 26258287 A JP26258287 A JP 26258287A JP 26258287 A JP26258287 A JP 26258287A JP H01107954 A JPH01107954 A JP H01107954A
- Authority
- JP
- Japan
- Prior art keywords
- casting
- product
- molten metal
- metal
- surface roughness
- 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
- 238000005266 casting Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims description 25
- 229910052751 metal Inorganic materials 0.000 claims abstract description 53
- 239000002184 metal Substances 0.000 claims abstract description 53
- 230000003746 surface roughness Effects 0.000 claims abstract description 22
- 239000002344 surface layer Substances 0.000 claims abstract description 10
- 239000004576 sand Substances 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 239000000463 material Substances 0.000 abstract description 4
- 239000010935 stainless steel Substances 0.000 abstract description 2
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 2
- 239000006260 foam Substances 0.000 abstract 2
- 239000004793 Polystyrene Substances 0.000 abstract 1
- 238000005187 foaming Methods 0.000 abstract 1
- 239000003110 molding sand Substances 0.000 abstract 1
- 229920002223 polystyrene Polymers 0.000 abstract 1
- 230000002093 peripheral effect Effects 0.000 description 8
- 229920006248 expandable polystyrene Polymers 0.000 description 7
- 239000004794 expanded polystyrene Substances 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 229920006327 polystyrene foam Polymers 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000007528 sand casting Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、例えば吸気マニホールド等、内部に所要の表
面粗度を有する内表面により区画された通路空間が形成
された金属部材を製造するための消失模型鋳造法に関す
る。Detailed Description of the Invention (Industrial Application Field) The present invention is for manufacturing a metal member, such as an intake manifold, in which a passage space is defined by an inner surface having a required surface roughness. Regarding the vanishing model casting method.
（従来の技術）
金属部材を鋳造する方法の一つに消失模型鋳造法がある
０例えば、この方法により第２図（ａ）に示すような円
筒状の金属部材３を鋳造する場合は、同図軸）に示すよ
うに、容器１内に鋳砂２を充填し、当該鋳砂２に金属部
材の完成形状と同一の形状、例えば円筒状に形成された
消失型、例えば、発泡ポリスチレン型３゛を埋設すると
共に、当該発泡ポリスチレン型３′の上部に鋳砂２がら
突出する発泡ポリスチレンよりなる湯口４を接続し、当
該湯口４から前記金属の溶湯を注入する。注入された溶
湯は、湯口４及び発泡ポリスチレン型３゛を順次熱分解
させてこれと置き換わり、最終的に所要の形状、即ち、
円筒形状を有する金属部材３を得ることが可能となる。(Prior art) One of the methods for casting metal members is the disappearance model casting method. For example, when casting a cylindrical metal member 3 as shown in FIG. 2(a) using this method, the same As shown in FIG. At the same time, a sprue 4 made of foamed polystyrene protruding from the casting sand 2 is connected to the upper part of the foamed polystyrene mold 3', and the molten metal is poured from the sprue 4. The injected molten metal sequentially thermally decomposes the sprue 4 and the foamed polystyrene mold 3' and replaces them, and finally forms the desired shape, i.e.
It becomes possible to obtain a metal member 3 having a cylindrical shape.
この方法は、従来の砂型鋳造法に比べて、■中空部材を
製造する際に中子を必要としないこと、■砂に粘結剤を
混入しないため、砂の回収が容易であること、■複雑形
状のものにも適用可能であること等の種々の利点を有す
るため、特に、エンジンの吸気マニホールド等の鋳造法
として期待されている。Compared to the conventional sand casting method, this method has the following advantages: (1) no core is required when manufacturing hollow parts, (2) no binder is mixed into the sand, and sand can be easily recovered; Since it has various advantages such as being applicable to objects with complex shapes, it is particularly expected to be used as a casting method for engine intake manifolds and the like.
（発明が解決しようとする問題点）
しかしながら、上記消失模型鋳造法においては、発泡ポ
リスチレン体を熱分解させて金属溶湯で置換するという
原理上、得られた金属部材の表面に微小な凹凸が生して
しまい、表面粗度を高めることが困難であるという問題
がある。従って、この方法により吸気マニホールドを製
造した場合、当該吸気マニホールド内に形成される吸気
ボート内周壁面の表面粗度が不可避的に粗くなってしま
う。(Problems to be Solved by the Invention) However, in the above-mentioned vanishing model casting method, due to the principle of thermally decomposing the expanded polystyrene body and replacing it with molten metal, minute irregularities occur on the surface of the obtained metal member. There is a problem in that it is difficult to increase the surface roughness. Therefore, when an intake manifold is manufactured by this method, the surface roughness of the inner circumferential wall surface of the intake boat formed in the intake manifold inevitably becomes rough.
ところで、吸気マニホールドの吸気ボート内周壁面の表
面粗度と吸気効率と密接な関係があり、表面粗度が向上
する程、吸気効率が増大し、エンジン性能が向上すると
いう知見が得られている。By the way, it has been found that there is a close relationship between the surface roughness of the inner circumferential wall of the intake boat of the intake manifold and intake efficiency, and that as the surface roughness improves, intake efficiency increases and engine performance improves. .
そこで、消失模型鋳造法により上記の吸気マニホールド
を製造したのち、吸気ａ−ト内周壁面の表面粗度を向上
させるために、当該内周壁面を研磨する、或いは、周壁
面に塗料を塗着する等の手段を講じることが考えられる
が、これらの作業は何れも極めて煩雑であり、製造コス
トの上昇を招来するという問題を生じる。Therefore, after manufacturing the above-mentioned intake manifold using the disappearing model casting method, in order to improve the surface roughness of the inner peripheral wall surface of the intake a-to, the inner peripheral wall surface is polished or paint is applied to the peripheral wall surface. However, all of these operations are extremely complicated and cause the problem of increasing manufacturing costs.
本発明は上記従来の問題点に鑑みてなされたもので、表
面研磨、塗料の塗着等の付加的な工程を必要とせずに、
所要の表面粗度を有する通路空間が形成された金属部材
を製造することが可能な消失模型鋳造法を提供すること
を目的とする。The present invention has been made in view of the above-mentioned conventional problems, and does not require additional processes such as surface polishing and paint application.
It is an object of the present invention to provide an investment casting method capable of manufacturing a metal member in which a passage space having a required surface roughness is formed.
（問題点を解決するための手段）
上記目的を達成するために本発明によれば、内部に、所
要の表面粗度を有する内表面により区画された所定形状
の通路空間が形成される金属部材を鋳造するに際し、該
鋳造される金属部材と同一形状の消失型を鋳砂中に埋設
して、当該消失型に接続される湯口から溶湯を注入し、
前記消失型を該溶湯で置換する消失模型鋳造法において
、前記内表面に対応する消失型の部位に前記所要の表面
粗度を有する金属薄板により表層を形成させることとし
たものである。(Means for Solving the Problems) In order to achieve the above object, the present invention provides a metal member in which a passage space of a predetermined shape defined by an inner surface having a required surface roughness is formed. When casting, a fugitive mold having the same shape as the metal member to be cast is buried in casting sand, and molten metal is injected from a sprue connected to the fugitive mold,
In the vanishing model casting method in which the vanishing mold is replaced with the molten metal, a surface layer is formed from a thin metal plate having the required surface roughness at a portion of the vanishing mold corresponding to the inner surface.
（作用）
金属溶湯を消失型に注入することにより、当該消失型が
熱分解して消失することにより金属で置換され、且つ、
消失型の通路空間に対応する周壁に予め表層として形成
させておいた所要の表面粗度を有する金属薄板の背面に
前記溶湯が接触してこれと一体化される。この結果、空
間周壁面に所要の表面粗度を有する金属薄板よりなる表
層が形成された金属部材を得る。(Function) By injecting molten metal into the fugitive mold, the fugitive mold thermally decomposes and disappears, replacing it with metal, and
The molten metal comes into contact with the back surface of a thin metal plate having a desired surface roughness, which has been formed in advance as a surface layer on the peripheral wall corresponding to the vanishable passage space, and is integrated with this. As a result, a metal member is obtained in which a surface layer made of a thin metal plate having a desired surface roughness is formed on the circumferential wall surface of the space.
（実施例）
以下、本発明の一実施例を添付図面に基づいて詳述する
。(Example) Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.
一例として、本発明の消失模型鋳造法をエンジンの吸気
マニホールドの製造に使用した場合について説明する。As an example, a case will be described in which the investment model casting method of the present invention is used to manufacture an intake manifold for an engine.
第１図は製造すべき内燃エンジンの吸気マニホールドと
同一形状の消失型、即ち発泡ポリスチレン型１０の一部
、即ち、吸気ポートに対応する部分１１（以下、吸気ボ
ート部分と称する）を示しである。吸気ボート部分１１
には吸気ポートに対応する部位に２個の通路空間１１ａ
、ｌｌｂが形成されている。鋳造に先立つて、当該通路
空間１１ａ、１１ｂの内周壁面に密着する金属薄板部材
、具体的には、第１図に示すような金属パイプ部材１２
．１３を前記吸気ボート内表面の表層として内嵌する。FIG. 1 shows a part of an extinguishable type, that is, a foamed polystyrene mold 10, which has the same shape as the intake manifold of an internal combustion engine to be manufactured, that is, a part 11 corresponding to the intake port (hereinafter referred to as the intake boat part). . Intake boat part 11
There are two passage spaces 11a in the parts corresponding to the intake ports.
, llb are formed. Prior to casting, a metal thin plate member, specifically a metal pipe member 12 as shown in FIG.
．． 13 is fitted as a surface layer on the inner surface of the intake boat.
この金属パイプ部材１２．１３を構成する金属としては
、特に限定されるものではないが、８００℃程度で熔融
せず、しかも、変形することのない金属材料が好ましく
、例えば、ＳＵＳ系のステンレス鋼等を使用することが
できる。又、パイプ部材の肉厚は例えば０．２−程度に
設定する。そして、これらのパイプ部材１２．１３の内
周面１２ａ、１３ａの表面粗度は吸気ポート周壁面とし
ての所要の表面粗度に設定されている。更に、これらの
パイプ部材１２．１３は通路空間１１ａ、ｌｌｂの形状
に合わせて成形されている。The metal constituting the metal pipe member 12.13 is not particularly limited, but it is preferably a metal material that does not melt or deform at about 800°C, such as SUS stainless steel. etc. can be used. Further, the wall thickness of the pipe member is set to, for example, about 0.2-. The surface roughness of the inner peripheral surfaces 12a, 13a of these pipe members 12, 13 is set to a required surface roughness as the peripheral wall surface of the intake port. Furthermore, these pipe members 12, 13 are shaped to match the shape of the passage spaces 11a, llb.
次いで、このように吸気ボート部分１１に金属パイプ部
材１２．１３を内嵌した発泡ポリスチレン型１０を第２
図（ロ）に示したような鋳造装置に収容する。即ち、容
器１内に収容し、鋳砂２を加振しながら充填し、発泡ポ
リスチレン型１０を鋳砂２中に埋設する。この時、パイ
プ部材１２．１３内にも鋳砂２が充填される。Next, the expanded polystyrene mold 10 with the metal pipe member 12, 13 fitted inside the intake boat portion 11 in this manner is inserted into the second
It is housed in a casting device as shown in Figure (B). That is, it is placed in a container 1, filled with casting sand 2 while being vibrated, and the expanded polystyrene mold 10 is buried in the casting sand 2. At this time, the pipe member 12.13 is also filled with casting sand 2.
しかるのち、湯口から発泡ポリスチレン型１０に金属溶
湯例えばアルミニウム（Ａ２）系合金溶湯を注入し、発
泡ポリスチレン型１０を徐々に当該溶湯により置換し、
目的とするエンジンの吸気マニホールドを得る。こ、の
工程において、吸気ボート部分１１では金属パイプ１２
．１３の周囲の発泡ポリスチレン体１０が上記金属溶湯
で熱分解されて消失することにより、当８亥溶湯で置換
され、当８亥バイブ部材１２．１３の外周面に溶湯が密
着してそのまま冷却し、通路空間１１ａ、ｆｉｂ周壁面
にパイプ部材１２．１３が云わば鋳包まれた状態となる
。Thereafter, a molten metal, such as an aluminum (A2) alloy molten metal, is injected into the polystyrene foam mold 10 from the sprue, and the polystyrene foam mold 10 is gradually replaced with the molten metal.
Obtain the intake manifold for the desired engine. In this step, the metal pipe 12 is connected to the intake boat portion 11.
．． The foamed polystyrene body 10 around the vibrator 13 is thermally decomposed and disappeared by the molten metal, and is replaced by the molten metal, and the molten metal adheres to the outer peripheral surface of the vibrator member 12.13 and cools as it is. , the pipe members 12.13 are in a state of being cast into the surrounding wall surface of the passage space 11a and the fib.
金属溶湯が発泡ポリスチレン型１０と置換され、充分に
冷却した後、鋳砂２から金属部材を取り出して、前記湯
口を切除して吸気マニホールドを完成する。得られた吸
気マニホールドは、その吸気ボート周壁面に所要の表面
粗度を有する金属パイプ部材が高い密着強度で接合され
、表層を形成することとなり、従来の消失模型鋳造法に
より製造されたものと比較して吸気効率が飛躍的に向上
し、エンジン性能が極めて良好となる。After the molten metal is replaced with the expanded polystyrene mold 10 and sufficiently cooled, the metal member is taken out from the casting sand 2 and the sprue is cut out to complete the intake manifold. In the obtained intake manifold, a metal pipe member having the required surface roughness is joined to the peripheral wall of the intake boat with high adhesion strength to form a surface layer, and it is different from that manufactured by the conventional investment model casting method. In comparison, intake efficiency is dramatically improved and engine performance is extremely good.
尚、上記実施例においては、本発明方法をエンジンの吸
気マニホールドの製造に適用した場合について記述した
が、これに限るものではなく、例えば、内燃エンジンの
シリンダブロック、シリンダヘッド等内周面に所要の表
面粗度の内表面で区画された通路空間を有する部材に対
し広範に適用することが可能である。In the above embodiments, the method of the present invention is applied to the manufacture of engine intake manifolds, but the present invention is not limited to this. It can be widely applied to members having a passage space defined by an inner surface with a surface roughness of .
尚、上記実施例においては、消失型として発泡ポリスチ
レン型を使用した場合について記述したが、消失型の材
料としてはこれに限るものではなく、溶湯を注入するこ
とにより、例えば熱分解して消失するものであればよい
。In the above example, a case was described in which a foamed polystyrene type was used as the fugitive type, but the material for the fugitive type is not limited to this, and when molten metal is injected, the material disappears by thermal decomposition, for example. It is fine as long as it is something.
（発明の効果）
以上説明したように本発明によれば、内部に、所要の表
面粗度を有する内表面により区画された所定形状の通路
空間が形成される金属部材を鋳造するに際し、該鋳造さ
れる金属部材と同一形状の消失型を鋳砂中に埋設して、
当該消失型に接続される湯口から溶湯を注入し、前記消
失型を該溶湯で置換する消失模型鋳造法において、前記
内表面に対応する消失型の部位に前記所要の表面粗度を
有する金属薄板により表層を形成させることとしたので
、表面研磨、塗料の塗着等の付加的な工程を必要とする
ことなく、簡単な工程で所要の表面粗度を有する空間が
形成された金属部材を製造することが可能となり、内燃
エンジンを始めとする種々の機械部品の製造法として極
めて有用である。(Effects of the Invention) As explained above, according to the present invention, when casting a metal member in which a passage space of a predetermined shape defined by an inner surface having a required surface roughness is formed, the casting An extinguishable mold with the same shape as the metal component to be used is buried in casting sand,
In an extinguishable model casting method in which molten metal is injected from a sprue connected to the extinguishable mold and the extinguishable mold is replaced with the molten metal, a thin metal plate having the required surface roughness at a portion of the extinguishable mold corresponding to the inner surface. Since we decided to form a surface layer by using the above method, we can manufacture metal parts with spaces with the required surface roughness in a simple process without the need for additional processes such as surface polishing or painting. This makes it extremely useful as a manufacturing method for various mechanical parts including internal combustion engines.
第１図は本発明の一実施例を示し、内燃エンジンの吸気
マニホールドを製造する際に使用する発泡ポリスチレン
体の要部説明図、第２図は従来の消失模型鋳造法を説明
するための図であり、第２図（ａ）は鋳造すべき金属部
材の斜視図、同図（ｂ）は第２図（ａ）の金属部材を鋳
造する工程を示す構成図である。
２・・・鋳砂、１０・・・発泡ポリスチレン型（吸気マ
ニホールド）、ｌｌａ、ｌｌｂ・・・通路空間（吸気ポ
ー１−）、１２．１３・・・金属パイプ部材。
出願人 三菱自動車工業株式会社
代理人 弁理士 長 門 侃 二
第１図Fig. 1 shows one embodiment of the present invention, and is a diagram illustrating the main parts of a foamed polystyrene body used in manufacturing an intake manifold for an internal combustion engine, and Fig. 2 is a diagram illustrating the conventional investment model casting method. FIG. 2(a) is a perspective view of a metal member to be cast, and FIG. 2(b) is a configuration diagram showing the process of casting the metal member of FIG. 2(a). 2... Casting sand, 10... Expanded polystyrene mold (intake manifold), lla, llb... Passage space (intake port 1-), 12.13... Metal pipe member. Applicant Mitsubishi Motors Corporation Agent Patent Attorney Kanji Nagato Figure 1
Claims (1)
れた所定形状の通路空間が形成される金属部材を鋳造す
るに際し、該鋳造される金属部材と同一形状の消失型を
鋳砂中に埋設して、当該消失型に接続される湯口から溶
湯を注入し、前記消失型を該溶湯で置換する消失模型鋳
造法において、前記内表面に対応する消失型の部位に前
記所要の表面粗度を有する金属薄板により表層を形成さ
せることを特徴とする消失模型鋳造法。When casting a metal member in which a passage space of a predetermined shape defined by an inner surface having a required surface roughness is formed, an extinguishable mold having the same shape as the metal member to be cast is buried in casting sand. In the fugitive model casting method, in which molten metal is injected from a sprue connected to the fugitive mold to replace the fugitive mold with the molten metal, the required surface roughness is imparted to a portion of the fugitive mold corresponding to the inner surface. A vanishing model casting method characterized by forming a surface layer using a thin metal plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26258287A JPH01107954A (en) | 1987-10-20 | 1987-10-20 | Lost form pattern casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26258287A JPH01107954A (en) | 1987-10-20 | 1987-10-20 | Lost form pattern casting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01107954A true JPH01107954A (en) | 1989-04-25 |
Family
ID=17377811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26258287A Pending JPH01107954A (en) | 1987-10-20 | 1987-10-20 | Lost form pattern casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01107954A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02303670A (en) * | 1989-05-18 | 1990-12-17 | Kubota Corp | Stainless steel coated cast iron tube and manufacture thereof |
| FR2676015A1 (en) * | 1991-05-01 | 1992-11-06 | Outboard Marine Corp | Method and apparatus for the manufacture of a casing including an insert cast in situ by means of lost-foam casting |
| JPH05309437A (en) * | 1992-05-08 | 1993-11-22 | Tokyo Tekko Co Ltd | Lost foam pattern for casting and its production |
| CN107282886A (en) * | 2016-04-05 | 2017-10-24 | 福建聚能机械制造有限公司 | A kind of aluminium alloy lost foam casting technique of built-in spiral coil water channel |
-
1987
- 1987-10-20 JP JP26258287A patent/JPH01107954A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02303670A (en) * | 1989-05-18 | 1990-12-17 | Kubota Corp | Stainless steel coated cast iron tube and manufacture thereof |
| FR2676015A1 (en) * | 1991-05-01 | 1992-11-06 | Outboard Marine Corp | Method and apparatus for the manufacture of a casing including an insert cast in situ by means of lost-foam casting |
| JPH05309437A (en) * | 1992-05-08 | 1993-11-22 | Tokyo Tekko Co Ltd | Lost foam pattern for casting and its production |
| CN107282886A (en) * | 2016-04-05 | 2017-10-24 | 福建聚能机械制造有限公司 | A kind of aluminium alloy lost foam casting technique of built-in spiral coil water channel |
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