JPS63309351A - Full mold casting method - Google Patents
Full mold casting methodInfo
- Publication number
- JPS63309351A JPS63309351A JP62141976A JP14197687A JPS63309351A JP S63309351 A JPS63309351 A JP S63309351A JP 62141976 A JP62141976 A JP 62141976A JP 14197687 A JP14197687 A JP 14197687A JP S63309351 A JPS63309351 A JP S63309351A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- gas
- mold
- lost foam
- foam pattern
- 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 abstract description 22
- 238000010115 full-mold casting Methods 0.000 title claims description 11
- 229910052751 metal Inorganic materials 0.000 claims abstract description 49
- 239000002184 metal Substances 0.000 claims abstract description 49
- 238000013022 venting Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 abstract description 19
- 238000007711 solidification Methods 0.000 abstract description 4
- 230000008023 solidification Effects 0.000 abstract description 4
- 239000006260 foam Substances 0.000 abstract 5
- 238000005266 casting Methods 0.000 description 16
- 230000007547 defect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000002131 composite material Substances 0.000 description 3
- 238000007872 degassing Methods 0.000 description 3
- 230000006837 decompression Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000004794 expanded polystyrene Substances 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 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
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）
本発明は消失模型を用いるフルモールド鋳造方法、特に
消失模型で鋳ぐるみ部材を鋳型内に支持させて鋳造する
方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a full mold casting method using a vanishing model, and particularly to a method of casting a cast member by supporting it in a mold using a vanishing model.
（従来の技術）
鋳造方法の一つとして、例えば特開昭６１−１１５６６
０号公報に示されているように、発泡ポリスチレン等で
なる消失模型を鋳型（砂型）内に埋め込み、この模型を
溶湯の熱によって燃焼、消失させなから該溶湯と置換す
ることにより、この模型と同じ形状の製品を鋳造するフ
ルモールド鋳造法が実用化されており、この方法によれ
ば、高精度の製品が得られ、また造型に要するコストが
低減される等の効果が得られる。(Prior art) As one of the casting methods, for example, Japanese Patent Application Laid-Open No. 11566/1986
As shown in Publication No. 0, by embedding a vanishing model made of expanded polystyrene or the like in a mold (sand mold), and replacing this model with the molten metal without burning and dissipating it with the heat of the molten metal. A full-mold casting method has been put into practical use to cast a product with the same shape as the one shown in Figure 1. This method allows for the production of highly accurate products and reduces the cost required for molding.
一方、エンジンのシリンダブロックのように、ライナ部
分等の所定部位を予め形成した鋳ぐるみ部材で構成し、
これをアルミニウム合金等の母材で鋳ぐるんで複合材料
製品を得る場合には、一般にダイキャスト法が用いられ
る。その場合に、上記鋳ぐるみ部材を予め加熱しておけ
ば溶湯の冷却凝固が抑制され、該溶湯が加圧されている
ことと相俟って、鋳ぐるみ部材周囲の母材の肉厚が薄い
場合にも、良好な湯回り性が得られることになる。On the other hand, like the cylinder block of an engine, predetermined parts such as liner parts are made of pre-formed cast members,
In order to obtain a composite material product by casting this material with a base material such as an aluminum alloy, a die casting method is generally used. In that case, if the above-mentioned cast member is preheated, the cooling solidification of the molten metal will be suppressed, and together with the fact that the molten metal is pressurized, the thickness of the base material around the cast member will be thin. In this case, good water running properties can be obtained.
（発明が解決しようとする開題点）
ところで、上記シリンダブロックのような複合材料製品
についても、精度の向上やコストの低減等のために、上
記のフルモールド鋳造法を゛採用することが考えられる
が、この場合、次のような問題が発生する。(Problem to be Solved by the Invention) By the way, it is conceivable that the full mold casting method described above may also be adopted for composite material products such as the cylinder block described above in order to improve precision and reduce costs. However, in this case, the following problem occurs.
つまり、このフルモールド鋳造法においては、消失模型
が溶湯によって消失置換される際に発生するガスを抜く
必要上、鋳型として砂型が用いられることになるが、こ
のガス抜きが良好に行われないと、該ガスが溶湯内に取
り込まれて所謂巣が発生する等、鋳造欠陥を生じること
になる。In other words, in this full mold casting method, a sand mold is used as the mold because it is necessary to remove the gas that is generated when the disappearing model is dissipated and replaced by molten metal. This gas is taken into the molten metal and causes casting defects such as so-called cavities.
また、消失模型と置換される溶湯は、該模型の消失時に
おける吸熱作用により熱を奪われると共に、該模型によ
って支゛持されていた金属製の鋳ぐるみ部材に接触する
ため該鋳ぐるみ部材を介して放熱され、そのため溶湯が
早期に凝固する傾向がある。その場合に、鋳ぐるみ部材
は熱により変形、溶融し易い消失模型によって支持され
るので、該鋳ぐるみ部材を予め加熱しておくができず、
また鋳型として砂型が用いられるので溶湯を加圧するこ
ともできず、その結果、特に上記シリンダブロックのよ
うに鋳ぐるみ部材（ライナ）の周囲の母材の肉厚が薄い
場合には、溶湯が注湯途中で凝固して、湯回り不良が発
生するのである。In addition, the molten metal that replaces the disappearing model loses heat due to the endothermic action when the model disappears, and also comes into contact with the metal casting member supported by the model, so the molten metal displaces the cast member. Heat is dissipated through the molten metal, which tends to cause the molten metal to solidify prematurely. In that case, the cast member is supported by a disappearing model that is easily deformed and melted by heat, so it is not possible to heat the cast member in advance.
Furthermore, since a sand mold is used as the casting mold, it is not possible to pressurize the molten metal, and as a result, especially when the base material around the liner is thin like the cylinder block mentioned above, the molten metal cannot be poured. It solidifies during the hot water process, causing poor water flow.
本発明は、ライナ部を鋳ぐるみ部材で構成するシリンダ
ブロック等の複合材料製品の鋳造に関する上記のような
事情に対処し、この種の製品をフルモールド鋳造法を用
いて高精度且つ低コストで、しかも鋳造欠陥を生じるこ
となく良好に製造し得る方法を実現することを目的とす
る。The present invention addresses the above-mentioned circumstances regarding the casting of composite material products such as cylinder blocks whose liner portions are made of cast members, and uses a full mold casting method to produce these types of products with high precision and low cost. The object of the present invention is to realize a method that can be manufactured satisfactorily without causing casting defects.
（問題点を解決するための手段）
即ち、本発明に係るフルモールド鋳造方法は、金属製の
鋳ぐるみ部材を消失模型により鋳型内に支持して鋳造す
る場合において、上記消失模型として、鋳ぐるみ部材と
の接触面に一端が鋳型内に通じるガス抜き通路を設けた
ものを用いることを特徴とする。(Means for Solving the Problems) That is, in the full mold casting method according to the present invention, when a metal cast member is supported in a mold by a disappearing model and cast, a cast member is used as the disappearing model. It is characterized in that the contact surface with the member is provided with a degassing passage whose one end communicates with the inside of the mold.
（作 用）
上記の構成によれば、鋳ぐるみ部材を支持する消失模型
が溶湯の熱により該溶湯との接触部から順次消失される
際に、この消失に伴って発生するガスが該模型の未消失
部におけるガス抜き通路を通って鋳型（砂型）内に効果
的に排出されることになり、従ってガス抜き不良による
鋳造欠陥が防止されることになる。また、上記ガス抜き
通路は消失模型における鋳ぐるみ部材との接触面に設け
られているから、該模型と溶湯との置換部で発生したガ
スは砂型側へ逃がされるよりも、上記通路が設けられた
鋳ぐるみ部材側から排出されることになる。そのため、
上記消失模型と溶湯の置換部周辺では主として鋳ぐるみ
部材に接してガスが存在することになり、このガスが溶
湯先端部と鋳ぐるみ部材との間に一時的にガス層を形成
して、溶湯から鋳ぐるみ部材への熱伝達を阻止し、これ
により溶湯が保温されて、その早期凝固による湯回り不
良が回避されることになる。(Function) According to the above configuration, when the dissipating model supporting the cast member is sequentially dissipated from the contact area with the molten metal due to the heat of the molten metal, the gas generated due to the dissipation is transferred to the model. The gas is effectively discharged into the mold (sand mold) through the degassing passage in the undisappeared portion, thus preventing casting defects due to poor degassing. Furthermore, since the gas venting passage is provided at the contact surface of the vanishing model with the cast member, the gas generated at the replacement part between the model and the molten metal is not allowed to escape to the sand mold side, but rather is provided with the passage. It will be discharged from the cast member side. Therefore,
Gas exists mainly in contact with the cast member around the disappearing model and the molten metal replacement part, and this gas temporarily forms a gas layer between the molten metal tip and the cast member, and the molten metal This prevents heat transfer from the molten metal to the cast member, thereby keeping the molten metal warm and preventing poor molten metal flow due to early solidification.
（実 施 例）
以下、本発明に係るフルモールド鋳造方法の実施例につ
いて説明する。尚、この実施例はエンジ゛ンのシリンダ
ブロックを鋳造する場合のものである。(Example) Hereinafter, an example of the full mold casting method according to the present invention will be described. Note that this embodiment is for casting a cylinder block for an engine.
先ず、この方法で用いる鋳造装置の概略構成を説明する
と、第１図に示すように、該装置１は、基本的には型枠
２内に保持された砂型３を減圧台４上に載置した構成と
され、上記砂型３内が真空ポンプ５により減圧台４の内
部を介して減圧されるようになっている。First, the general structure of the casting apparatus used in this method will be explained. As shown in FIG. The inside of the sand mold 3 is depressurized by a vacuum pump 5 through the inside of a decompression table 4.
そして、砂型３内には発泡ポリスチレン製の消失模型６
が埋め込まれているが、この消失模型６は、製品たるシ
リンダブロックと同一形状の製品部７と、該製品部７に
一端が接続された湯道部８と、該湯道部８の他端に設け
られて砂型３（型枠２）の上面に臨む湯口部９とで構成
されていると共に、」−記製品部７における薄肉円筒状
のシリンダ部７ａの内側には、予め形成された金属製の
シリンダライナ１０が鋳ぐるみ部材として嵌合保持され
ている。Inside the sand mold 3 is a vanishing model 6 made of expanded polystyrene.
This disappearing model 6 has a product part 7 having the same shape as the product cylinder block, a runner part 8 whose one end is connected to the product part 7, and the other end of the runner part 8. A sprue part 9 is provided in the sand mold 3 (formwork 2) and faces the upper surface of the sand mold 3 (formwork 2). A cylinder liner 10 made of 100% is fitted and held as a cast member.
然してこの装置１を用いる本発明方法の実施例では、第
２．３図に拡大して示すように、上記消失模型６として
、シリンダ部７ａのシリンダライナ１０と接触する内周
面に該ライナ１ｏの軸方向（上下方向）に延びる複数本
の溝７ａ’・・・７ａ’が一定間隔で設けられた消失模
型が用いられる。However, in the embodiment of the method of the present invention using this device 1, as shown in an enlarged view in FIG. A vanishing model is used in which a plurality of grooves 7a'...7a' extending in the axial direction (vertical direction) are provided at regular intervals.
ここで、上記溝７ａ′・・・７ａ’の上端は、通気性を
有する多孔材でなるカバ一部材１１を介して砂型３内に
連通されている。Here, the upper ends of the grooves 7a'...7a' are communicated with the inside of the sand mold 3 via a cover member 11 made of a porous material having air permeability.
次に、この方法を用いる鋳造作業を具体的に説明する。Next, a casting operation using this method will be specifically explained.
先ず、第１図に示すように鋳造装置１を構成した後、砂
型３の上面に臨む消失模型６の湯口部９から溶湯を注入
すれば、この溶湯の熱により消失模型６が上記湯口部９
から湯道部８及び製品部７にかけて順次燃焼して消失す
ると共に、その消失に従って溶湯が砂型３内に流入し、
このように消失模型６と溶湯とが置換されながら、該溶
湯が消失模型６の消失前の形状と同一形状で砂型３内に
充填されることになる。その場合に、消失模型６におけ
る製品部７のスカート部７ｂまでの部分については、そ
の消失時に発生するガスは、真空ポンプ５により減圧台
４を介して減圧されている砂型３側に直接逃がされるこ
とになる。First, after constructing the casting apparatus 1 as shown in FIG.
The molten metal sequentially burns and disappears from the runner part 8 to the product part 7, and as it disappears, the molten metal flows into the sand mold 3,
While the disappearing model 6 and the molten metal are replaced in this way, the molten metal is filled into the sand mold 3 in the same shape as the disappearing model 6 before it disappears. In this case, in the part of the disappearing model 6 up to the skirt part 7b of the product part 7, the gas generated when it disappears is directly released to the side of the sand mold 3, which is being depressurized by the vacuum pump 5 via the decompression table 4. It turns out.
然るに、第４図に示すように上記消失模型６と溶湯Ａと
の置換がシリンダライナ１０を支持する製品部７のシリ
ンダ部７ａにまで進行すると、上記ガスは該シリンダ部
７ａの内周面に形成された溝７ａ′・・・７ａ′を通っ
て該置換部Ｘ（消失模型６と溶湯Ａの接触部）から上方
に逃がされ、該溝上端の多孔材でなるカバ一部材１１を
介して砂型３１！１へ排出されることになる。そのため
、ガスが直接砂型３側へ逃がされる場合に比較してその
排出が良好に行われて、溶湯Ａ内に取り込まれることが
なくなる。また、上記置換部Ｘの周辺においては、ガス
は主として上記溝７ａ’・・・７ａ′が形成されたシリ
ンダライナ１０（！！！Ｉに集中して存在することにな
り、このガスにより溶湯Ａの先端部とシリンダライナ１
０との間に一時的にガス層Ｂが形成されることになる。However, as shown in FIG. 4, when the displacement of the disappearing model 6 and the molten metal A progresses to the cylinder part 7a of the product part 7 that supports the cylinder liner 10, the gas flows onto the inner circumferential surface of the cylinder part 7a. Through the formed grooves 7a'...7a', it escapes upward from the displacement part The sand is then discharged into the sand mold 31!1. Therefore, compared to the case where the gas is directly released to the sand mold 3 side, the gas is discharged better and is not taken into the molten metal A. Further, in the vicinity of the replacement part X, the gas is mainly concentrated in the cylinder liner 10 (!!! tip and cylinder liner 1
0, a gas layer B is temporarily formed between the two.
そして、このガス層Ｂが断熱層となって溶湯Ａからシリ
ンダライナ１０への熱伝達を阻止することにより、溶湯
Ａが保温されて該溶湯Ａの早期凝固が防止されると共に
、上記のようにガスが？”Ｎ ７ ａ ′・・・７ａ”
によって良好に排出されて溶湯Ａの流動に対する抵抗が
減少し、その結果、溶湯Ａの湯回りが良くなる。これに
より、溶湯Ａは、消失模型６のシリンダ部７ａの上端ま
で確実に充填されることになり、シリンダ部にシリンダ
ライナ１０が鋳ぐるまれてなるシリンダブロックが巣や
湯回り不良等の鋳造欠陥を生じることなく、良好に製造
されることになる。This gas layer B acts as a heat insulating layer and prevents heat transfer from the molten metal A to the cylinder liner 10, thereby keeping the molten metal A warm and preventing early solidification of the molten metal A. Gas? "N 7 a'...7a"
As a result, the molten metal A is efficiently discharged and the resistance to the flow of the molten metal A is reduced, resulting in improved flow of the molten metal A. As a result, the molten metal A is reliably filled up to the upper end of the cylinder part 7a of the vanishing model 6, and the cylinder block in which the cylinder liner 10 is cast into the cylinder part may have casting defects such as cavities or poor hot water circulation. This means that the product can be manufactured satisfactorily without causing any problems.
（発明の効果）
以上のように本発明に係るフルモールド鋳造方法によれ
ば、金属製の鋳ぐるみ部材を消失模型によって鋳型内に
支持して鋳造する場合に、上記消失模型の消失時に生じ
るガスを、該模型の鋳ぐるみ部材との接触面に設けたガ
ス抜き通路により効果的に排出するようにしたから、巣
等の発生が防止されると共に、上記ガスによって溶湯先
端部と鋳ぐるみ部材との間にガス層が形成されて、この
ガス層によって溶湯が保温されることになり、従ってシ
リンダブロックにおけるシリンダライナを薄肉の母材で
鋳ぐるむ場合等においても、良好な湯回り性が得られる
ことになる。これにより、消失模型を用いることによる
精度の向上やコストの低減等が図られると共に、巣や湯
回り不良等の鋳造欠陥のない良好な製品が得られること
になる。(Effects of the Invention) As described above, according to the full mold casting method of the present invention, when a metal cast member is supported in a mold by a vanishing model and cast, the gas generated when the vanishing model disappears. Since the gas is effectively discharged through the gas vent passage provided on the contact surface of the model with the cast member, the occurrence of cavities etc. is prevented, and the gas also prevents the tip of the molten metal and the cast member from coming into contact with each other. A gas layer is formed in between, and this gas layer keeps the molten metal warm. Therefore, even when the cylinder liner in the cylinder block is cast with a thin base material, good flowability can be achieved. It will be done. As a result, accuracy can be improved and costs can be reduced by using the vanishing model, and a good product without casting defects such as cavities or poor hot water circulation can be obtained.
第１図は本発明方法の実施例で用いられる鋳造装置の概
略断面図、第２図は第１図■−■線で切断した要部拡大
断面図、第３図は第２図■−■線で切断した要部断面図
、第４図は消失模型と溶湯との置換状態を示す要部拡大
断面図である。
３・・・鋳型（砂型）、６・・・消失模型、７ａ′・・
・ガス抜き通路（溝）、１０・・・鋳ぐるみ部材（シリ
ンダライナ）。
第１図
第４ＩＡFig. 1 is a schematic sectional view of a casting apparatus used in an embodiment of the method of the present invention, Fig. 2 is an enlarged sectional view of the main part taken along the line FIG. 4 is an enlarged sectional view of the main part showing the replacement state of the disappearing model and the molten metal. 3...Mold (sand mold), 6...Disappeared model, 7a'...
・Gas venting passage (groove), 10... Casting member (cylinder liner). Figure 1 Section 4IA
Claims (1)
支持して鋳造するフルモールド鋳造方法であつて、上記
消失模型として、鋳ぐるみ部材との接触面に一端が鋳型
内に通じるガス抜き通路が形成されたものを用い、該消
失模型の消失時に生じるガスを上記ガス抜き通路から排
出させながら注湯することを特徴とするフルモールド鋳
造方法。(1) A full mold casting method in which a metal cast member is supported in a mold by a vanishing model and cast, wherein the vanishing model is a gas vent that has one end connected to the contact surface with the cast member into the mold. A full mold casting method characterized in that a mold having a passage formed therein is used and the metal is poured while the gas generated when the disappearing model disappears is discharged from the gas venting passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62141976A JPS63309351A (en) | 1987-06-05 | 1987-06-05 | Full mold casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62141976A JPS63309351A (en) | 1987-06-05 | 1987-06-05 | Full mold casting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63309351A true JPS63309351A (en) | 1988-12-16 |
Family
ID=15304499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62141976A Pending JPS63309351A (en) | 1987-06-05 | 1987-06-05 | Full mold casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63309351A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07314121A (en) * | 1994-05-27 | 1995-12-05 | Tochigi Pref Gov | Method and device for composite casting of dissimilar metal using lost foam pattern casting method |
| CN106238675A (en) * | 2016-07-30 | 2016-12-21 | 安徽全柴天和机械有限公司 | A kind of technique improving yield of lost foam casting of engine cylinder block |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6363549A (en) * | 1986-09-05 | 1988-03-19 | Isuzu Motors Ltd | Expendable pattern for using full mold process and its production and apparatus |
-
1987
- 1987-06-05 JP JP62141976A patent/JPS63309351A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6363549A (en) * | 1986-09-05 | 1988-03-19 | Isuzu Motors Ltd | Expendable pattern for using full mold process and its production and apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07314121A (en) * | 1994-05-27 | 1995-12-05 | Tochigi Pref Gov | Method and device for composite casting of dissimilar metal using lost foam pattern casting method |
| CN106238675A (en) * | 2016-07-30 | 2016-12-21 | 安徽全柴天和机械有限公司 | A kind of technique improving yield of lost foam casting of engine cylinder block |
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