JPH0558820B2 - - Google Patents
Info
- Publication number
- JPH0558820B2 JPH0558820B2 JP61109315A JP10931586A JPH0558820B2 JP H0558820 B2 JPH0558820 B2 JP H0558820B2 JP 61109315 A JP61109315 A JP 61109315A JP 10931586 A JP10931586 A JP 10931586A JP H0558820 B2 JPH0558820 B2 JP H0558820B2
- Authority
- JP
- Japan
- Prior art keywords
- sand mold
- mold core
- model
- sand
- casting
- 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
- 239000004576 sand Substances 0.000 claims description 58
- 238000005266 casting Methods 0.000 claims description 24
- 239000004033 plastic Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 10
- 238000000465 moulding Methods 0.000 claims description 8
- 238000005187 foaming Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- 229920006248 expandable polystyrene Polymers 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 230000008034 disappearance Effects 0.000 description 1
- 239000004794 expanded polystyrene Substances 0.000 description 1
- 239000003110 molding sand Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
- B22C7/023—Patterns made from expanded plastic materials
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、鋳造用模型の成形方法であつて、
より詳しくは、砂型中子と、この砂型中子を抱き
込む消失模型とで構成される鋳造用模型の成形方
法に関する。[Detailed Description of the Invention] (Industrial Application Field) The present invention provides a method for molding a casting model, comprising:
More specifically, the present invention relates to a method for forming a casting model that includes a sand mold core and a disappearing model that encloses the sand mold core.
（従来の技術）
発泡プラスチツク製の消失模型を使用した鋳造
方法は広く使用されている。BACKGROUND OF THE INVENTION Casting methods using vanishing models made of foamed plastic are widely used.
この鋳造方法は造型を容易にさせるもので、模
型を例えば発泡ポリスチロールで成形し、これを
鋳物砂の中に埋め込んで砂型を成形し、この埋め
込んだ模型に対して溶湯を鋳込むものである。上
記発泡ポリスチロールは99％以上が空気でありそ
の実体は極めて微量である。従つて、これが溶湯
に接するとただちに燃焼してガス化し、これと入
れかわりに溶湯が鋳型内に充満されて鋳造がなさ
れる。 This casting method facilitates molding by molding a model from, for example, foamed polystyrene, embedding it in foundry sand to form a sand mold, and then pouring molten metal into the embedded model. The above-mentioned expanded polystyrene is made up of more than 99% air, and the actual amount of air is extremely small. Therefore, when it comes into contact with the molten metal, it is immediately combusted and gasified, and the mold is then filled with the molten metal to perform casting.
（発明が解決しようとする問題点）
ところで、鋳造しようとする鋳物の形状が複雑
である場合には、その鋳造用模型を全て消失模型
で成形すると、この型の内部への鋳物砂の充填が
不完全となる場合があり、所望の鋳型の成形がで
きないという不都合を生じる。そこで、このよう
な不都合を解消するために、鋳造用模型を砂型中
子と、これを抱き込む消失模型とで構成する場合
がある。(Problem to be Solved by the Invention) By the way, when the shape of the casting to be cast is complex, if the casting model is entirely formed using a disappearing model, it is difficult to fill the inside of the mold with molding sand. This may result in incomplete molding, resulting in the inconvenience that the desired mold cannot be formed. Therefore, in order to eliminate such inconveniences, a casting model may be constructed of a sand mold core and a disappearing model that encloses the sand mold core.
上記のような鋳造用模型の成形方法としては、
まず、砂型中子を模型成形用の金型内に設置し、
次に、上記金型の内面と砂型中子の外面との間に
形成されたキヤビテイで発泡用プラスチツクのビ
ーズを発泡させて消失模型を成形することが考え
られる。 The method for forming a casting model as described above is as follows:
First, place the sand mold core in the mold for model molding,
Next, it is conceivable to form a disappearing model by foaming beads of foamable plastic in a cavity formed between the inner surface of the mold and the outer surface of the sand mold core.
しかし、上記方法では、砂型中子の近傍で発泡
するプラスチツクはこの砂型中子により熱を奪わ
れてその発泡が不十分となるおそれがある。つま
り、砂型中子の近傍において発泡の終了した部分
が上記キヤビテイに合致しない形状となるおそれ
がある。 However, in the above method, there is a risk that the plastic foaming in the vicinity of the sand mold core will be deprived of heat by the sand mold core, resulting in insufficient foaming. In other words, there is a risk that the foamed portion near the sand mold core will have a shape that does not match the cavity.
そこで、金型と、この金型の内部に設置された
砂型中子とを金型の外部から加熱して、この砂型
中子を所望温度にさせることが考えられる。 Therefore, it is conceivable to heat the mold and the sand mold core installed inside the mold from the outside of the mold to bring the sand mold core to a desired temperature.
しかしながら、砂型中子の熱伝導率は低いもの
であるため、この砂型中子を金型の外部から間接
的に加熱すると、極めて長時間を要することにな
る。 However, since the sand mold core has a low thermal conductivity, it takes a very long time to heat the sand mold core indirectly from outside the mold.
しかも、砂型中子は金型の内部に位置している
ため、砂型中子が所望温度に達したか否か等、砂
型中子の状態を知ることは容易ではなく、つま
り、上記のようにした場合には、砂型中子の温度
管理が極めて困難になるという問題もある。 Moreover, since the sand mold core is located inside the mold, it is not easy to know the status of the sand mold core, such as whether or not the sand mold core has reached the desired temperature. In this case, there is also the problem that temperature control of the sand mold core becomes extremely difficult.
（発明の目的）
この発明は、上記のような事情に注目してなさ
れたもので、砂型中子と、この砂型中子を抱き込
む消失模型とで構成される鋳造用模型を所望精度
の形状にするために、砂型中子の加熱をしようと
する場合において、この砂型中子の加熱が短時間
にできるようにし、かつ、この砂型中子の温度管
理が容易、かつ確実にできるようにすることを目
的とする。(Object of the Invention) This invention was made in view of the above-mentioned circumstances, and it is possible to create a casting model consisting of a sand mold core and a vanishing model that envelops the sand mold core into a shape with desired precision. To make it possible to heat the sand mold core in a short time and to easily and reliably control the temperature of the sand mold core when heating the sand mold core in order to The purpose is to
（発明の構成）
上記目的を達成するためのこの発明の特徴とす
るところは、鋳造用模型の成形用金型とは別個に
上記砂型中子を予め加熱し、この加熱した砂型中
子を上記金型内に設置し、次に、上記金型の内面
と砂型中子の外面との間に形成されたキヤビテイ
で発泡プラスチツクを加熱により発泡させて消失
模型を成形する点にある。(Structure of the Invention) A feature of the present invention for achieving the above object is that the sand mold core is preheated separately from the mold for forming the casting model, and the heated sand mold core is heated as described above. The plastic is placed in a mold, and then the foamed plastic is foamed by heating in a cavity formed between the inner surface of the mold and the outer surface of the sand mold core to form a disappearing model.
（実施例）
以下、この発明の実施例を図面により説明す
る。(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
第５図において、１は成形しようとする鋳造用
模型である。この鋳造用模型１は砂型中子２と、
この砂型中子２を抱き込む消失模型３とで構成さ
れている。 In FIG. 5, 1 is a casting model to be molded. This casting model 1 includes a sand mold core 2,
It is composed of a disappearing model 3 that embraces this sand mold core 2.
以下、上記鋳造用模型１の成形方法につき説明
する。 Hereinafter, a method for forming the casting model 1 will be explained.
第１図で示すように、まず、金型４を構成する
上下金型５，６を開く。 As shown in FIG. 1, first, the upper and lower molds 5 and 6 constituting the mold 4 are opened.
次に、第２図で示すように下金型６内の所定位
置に予め成形してある上記砂型中子２を設置す
る。この場合、砂型中子２は予め加熱炉等で40℃
〜90℃の範囲に、上記金型４とは別個に加熱して
おく。 Next, as shown in FIG. 2, the previously formed sand mold core 2 is placed in a predetermined position within the lower mold 6. In this case, the sand mold core 2 is heated to 40°C in advance in a heating furnace, etc.
It is heated separately from the mold 4 to a temperature of ~90°C.
そして、第３図で示すように上下金型５，６を
接合して金型４を閉じる。 Then, as shown in FIG. 3, the upper and lower molds 5 and 6 are joined and the mold 4 is closed.
この際、第４図で示すように金型４の内面と砂
型中子２の外面との間に形成されたキヤビテイ７
に発泡用ポリスチロール等の発泡プラスチツクの
ビーズを挿入し、次に、これを加熱して発泡させ
る。すると、発泡したプラスチツクが上記砂型中
子２を抱き込みながら上記キヤビテイ７に充満す
る。この場合、砂型中子２は予め前記した所望温
度にまで加熱してあるため、発泡するプラスチツ
クがこの砂型中子２に熱を奪われることは防止さ
れる。よつて、上記プラスチツクは砂型中子２に
阻害されることなく、上記キヤビテイ７に全体的
に合致するまで所定の発泡を続け、ここに、キヤ
ビテイ７に合致する所定形状の前記消失模型３が
得られる。 At this time, as shown in FIG. 4, a cavity 7 is formed between the inner surface of the mold 4 and the outer surface of the sand mold core 2.
Beads of foamed plastic, such as foamed polystyrene, are inserted into the tube, which is then heated and foamed. Then, the foamed plastic fills the cavity 7 while enclosing the sand mold core 2. In this case, since the sand mold core 2 has been heated to the above-mentioned desired temperature in advance, the foaming plastic is prevented from losing heat to the sand mold core 2. Therefore, the plastic continues to foam in a predetermined manner without being hindered by the sand mold core 2 until it completely matches the cavity 7, and the disappearing model 3 having a predetermined shape that matches the cavity 7 is obtained. It will be done.
そして、第５図で示すように、上下金型５，６
を開いて成形品を取り出せば、所望形状の鋳造用
模型１が得られることとなる。 Then, as shown in FIG. 5, upper and lower molds 5, 6
When opened and the molded product is taken out, a casting model 1 having a desired shape is obtained.
（発明の効果）
この発明によれば、鋳造用模型を成形するに際
し、砂型中子を予め加熱してこれを模型成形用の
金型内に設置し、次に、上記金型の内面と砂型中
子の外面との間に形成されたキヤビテイで発泡プ
ラスチツクを加熱により発泡させて消失模型を成
形するようにしたため、キヤビテイにおいて発泡
するプラスチツクが砂型中子に熱を奪われること
は防止される。よつて、このプラスチツクは砂型
中子に阻害されることなくキヤビテイに全体的に
合致するまで所定の発泡を続け、キヤビテイに合
致する所定形状の消失模型が成形される。即ち、
この発明によれば、砂型中子と消失模型の組み合
せに係る鋳造用模型を所望形状に高精度に成形す
ることができる。しかも、上記砂型中子は金型と
は別個に予め加熱したものであるため、金型の外
部から間接的に砂型中子を加熱するのとは違つ
て、第１に、砂型中子を直接的に加熱でき、よつ
て、砂型中子は熱伝導率が低いものではあるが、
その加熱が短時間にできることとなる。また、第
２に、砂型中子の温度は直接的に検知できるた
め、その温度管理が容易、かつ確実にできること
となる。(Effect of the invention) According to the present invention, when molding a casting model, a sand mold core is heated in advance and placed in a mold for molding the model, and then the inner surface of the mold and the sand mold are heated. Since the foamed plastic is heated and foamed in the cavity formed between the mold and the outer surface of the core to form a disappearing model, the plastic foamed in the cavity is prevented from losing heat to the sand mold core. Therefore, the plastic continues to foam in a predetermined manner without being hindered by the sand mold core until it completely conforms to the cavity, and a disappearing model having a predetermined shape that conforms to the cavity is formed. That is,
According to this invention, a casting model that is a combination of a sand mold core and a disappearing model can be molded into a desired shape with high precision. Moreover, since the sand mold core mentioned above is preheated separately from the mold, firstly, unlike heating the sand mold core indirectly from outside the mold, the sand mold core cannot be directly heated. Therefore, although sand mold cores have low thermal conductivity,
The heating can be done in a short time. Secondly, since the temperature of the sand mold core can be directly detected, the temperature can be easily and reliably controlled.
ところで、上記砂型中子を金型と別個に加熱す
ると、その後、この砂型中子を金型内に設置する
のに時間を要し、温度が低下してしまうおそれが
ある。しかし、前記したように砂型中子の熱伝導
率は低いため、一旦加熱した後の温度低下には時
間を要する。よつて、上記のように砂型中子を金
型と別個に加熱しても、発泡プラスチツクを発泡
させる際の砂型中子に所望の温度を確保させるこ
とが支障なくできる。 By the way, if the sand mold core is heated separately from the mold, it takes time to install the sand mold core in the mold, and the temperature may drop. However, as described above, since the thermal conductivity of the sand mold core is low, it takes time for the temperature to decrease once heated. Therefore, even if the sand mold core is heated separately from the mold as described above, it is possible to ensure the desired temperature in the sand mold core when foaming the foamed plastic without any problem.
要するに、上記した如く、砂型中子を金型とは
別個に加熱することが高精度の鋳造用模型を得る
上で極めて好都合である。 In short, as described above, it is extremely convenient to heat the sand mold core separately from the mold in order to obtain a highly accurate casting model.
図はこの発明の実施例を示すもので、第１図か
ら第５図は鋳造用模型の成形手順を示す簡略側面
断面図である。
１……鋳造用模型、２……砂型中子、３……消
失模型、４……金型、７……キヤビテイ。
The drawings show an embodiment of the invention, and FIGS. 1 to 5 are simplified side sectional views showing the procedure for forming a casting model. 1...Casting model, 2...Sand mold core, 3...Disappearance model, 4...Mold, 7...Cavity.
Claims (1)
型とで構成される鋳造用模型の成形方法であつ
て、上記鋳造用模型の成形用金型とは別個に上記
砂型中子を予め加熱し、この加熱した砂型中子を
上記金型内に設置し、次に、上記金型の内面と砂
型中子の外面との間に形成されたキヤビテイで発
泡プラスチツクを加熱により発泡させて消失模型
を成形することを特徴とする鋳造用模型の成形方
法。1. A method for forming a casting model consisting of a sand mold core and a vanishing model that embraces the sand mold core, the sand mold core being preheated separately from the molding die of the casting model. Then, this heated sand mold core is placed in the mold, and then the foamed plastic is heated and foamed in the cavity formed between the inner surface of the mold and the outer surface of the sand mold core to create a disappearing model. A method for forming a casting model, characterized by forming a casting model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10931586A JPS62263844A (en) | 1986-05-12 | 1986-05-12 | Forming method for model for casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10931586A JPS62263844A (en) | 1986-05-12 | 1986-05-12 | Forming method for model for casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62263844A JPS62263844A (en) | 1987-11-16 |
| JPH0558820B2 true JPH0558820B2 (en) | 1993-08-27 |
Family
ID=14507094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10931586A Granted JPS62263844A (en) | 1986-05-12 | 1986-05-12 | Forming method for model for casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62263844A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02169232A (en) * | 1988-12-22 | 1990-06-29 | Aisin Takaoka Ltd | Mold for foam molding |
| US5063992A (en) * | 1989-07-31 | 1991-11-12 | Ford Motor Company | Hollow connecting rod |
| US8591787B2 (en) * | 2007-07-03 | 2013-11-26 | Ic Patterns, Llc | Foam patterns |
| CN102632193A (en) * | 2011-04-12 | 2012-08-15 | 南通华东油压科技有限公司 | Preparation process of lost foam |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5645249A (en) * | 1979-09-21 | 1981-04-24 | Honda Motor Co Ltd | Production of pattern for casting |
| JPS56109140A (en) * | 1980-02-01 | 1981-08-29 | Hitachi Ltd | Precision casting method |
-
1986
- 1986-05-12 JP JP10931586A patent/JPS62263844A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5645249A (en) * | 1979-09-21 | 1981-04-24 | Honda Motor Co Ltd | Production of pattern for casting |
| JPS56109140A (en) * | 1980-02-01 | 1981-08-29 | Hitachi Ltd | Precision casting method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62263844A (en) | 1987-11-16 |
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