JPS645806B2 - - Google Patents
Info
- Publication number
- JPS645806B2 JPS645806B2 JP1072383A JP1072383A JPS645806B2 JP S645806 B2 JPS645806 B2 JP S645806B2 JP 1072383 A JP1072383 A JP 1072383A JP 1072383 A JP1072383 A JP 1072383A JP S645806 B2 JPS645806 B2 JP S645806B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- core
- plastic
- casting
- water
- 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
Links
- 229920003023 plastic Polymers 0.000 claims description 34
- 238000005266 casting Methods 0.000 claims description 33
- 239000004033 plastic Substances 0.000 claims description 33
- 229920002379 silicone rubber Polymers 0.000 claims description 12
- 239000004945 silicone rubber Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 8
- 239000002195 soluble material Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000000498 cooling water Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 4
- 239000003822 epoxy resin Substances 0.000 description 4
- 229920000647 polyepoxide Polymers 0.000 description 4
- 229910001388 sodium aluminate Inorganic materials 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011505 plaster Substances 0.000 description 2
- 229920002050 silicone resin Polymers 0.000 description 2
- 239000011111 cardboard Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
- B29C33/52—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles soluble or fusible
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
この発明は水溶性中子を用いたプラスチツク鋳
造方法に関する。DETAILED DESCRIPTION OF THE INVENTION This invention relates to a plastic casting method using a water-soluble core.
エンジンのピストンシリンダヘツド等の機械部
品に加わる様々の応力を解析する手段の１つとし
て三次元光弾性法応力解析手段が知られている。
この解析手段には、応力解析を実施しようとする
機械部品と同じ形状の透明プラスチツク模型が必
要であり、この模型の精度が応力解析の精度に大
きな影響をもつ。したがつてエンジン部品の応力
解析を行なう為には冷却水ジヤケツトのような複
雑な形の中空部を有するシリンダヘツド等の精密
な模型を製作する必要がある。 Three-dimensional photoelastic stress analysis means is known as one means for analyzing various stresses applied to mechanical parts such as piston cylinder heads of engines.
This analysis means requires a transparent plastic model with the same shape as the mechanical part for which stress analysis is to be performed, and the accuracy of this model has a large effect on the accuracy of stress analysis. Therefore, in order to perform stress analysis on engine parts, it is necessary to manufacture a precise model of a cylinder head or the like having a hollow part of a complex shape, such as a cooling water jacket.
ところで、従来は厚紙、石膏、シリコンゴム板
等と骨材とを並用して形成された鋳型内の空所に
エポキシ樹脂液等の液状のプラスチツクを注入固
化させるといつた方法により、光弾性法応力解析
に使用するプラスチツク模型を製作している。 By the way, the photoelastic method has conventionally been carried out by injecting and solidifying liquid plastic such as epoxy resin liquid into the void space in a mold formed by using cardboard, plaster, silicone rubber plate, etc. together with aggregate. We manufacture plastic models used for stress analysis.
ところが上記した鋳型を使用する従来の方法で
は、プラスチツク模型の鋳肌に骨材（鋳型構成材
料の一部）が付着して鋳肌が粗くなつたり、鋳物
に対する鋳型の型ばらしが難かしい等の理由によ
り、中空断面の冷却水ジヤケツトをもつたピスト
ン、シリンダヘツド等のプラスチツク模型を精密
に製作することは困難であつた。 However, in the conventional method using the above-mentioned mold, aggregate (a part of the mold constituent material) adheres to the casting surface of the plastic model, making the casting surface rough, and it is difficult to separate the mold from the casting. For this reason, it has been difficult to precisely manufacture plastic models of pistons, cylinder heads, etc. with hollow cross-section cooling water jackets.
この発明は上記諸事情に鑑みてなされたもの
で、プラスチツク鋳物の製作に当つて鋳肌に対す
る骨材の付着をなくして滑らかな鋳肌を得ること
ができるとともに鋳型の型ばらしを容易にできる
ため、冷却水ジヤケツトを有するシリンダヘツド
等のような中空部を有する複雑な形状のプラスチ
ツク鋳物の製作を可能にする、水溶性中子を用い
たプラスチツク鋳造方法の提供を目的とする。 This invention was made in view of the above-mentioned circumstances, and it is possible to obtain a smooth casting surface by eliminating the adhesion of aggregate to the casting surface when producing plastic castings, and it is also possible to easily disassemble the mold. The object of the present invention is to provide a plastic casting method using a water-soluble core, which makes it possible to produce plastic castings of complex shapes having hollow parts, such as cylinder heads with cooling water jackets.
以下この発明を図面を参照して説明する。 The present invention will be explained below with reference to the drawings.
図面はこの発明を実施するために使用する鋳型
Ａを示すものであり、鋳型Ａは上面に凹部を形成
した下型１と下面に凹部を形成した上型２とを
各々の凹部を対向させ、重ね合わせて構成したも
のであり、上型２の上面には凹部に通じる湯口２
ａが形成されている。鋳型Ａの内部には下型１の
凹部と上型２の凹部によつて空所Ｃが形成され
る。 The drawing shows a mold A used to carry out the present invention, and the mold A consists of a lower mold 1 having a concave portion formed on the upper surface and an upper mold 2 having a concave portion formed on the lower surface, each having their concave portions facing each other. The upper mold 2 has a sprue 2 that leads to the recess on the top surface of the upper mold 2.
a is formed. Inside the mold A, a cavity C is formed by the recess of the lower mold 1 and the recess of the upper mold 2.
なお、図面の空所Ｃの断面は長方形状になつて
いるが、実際には、上記三次元光弾性法によつて
応力解析されるエンジンのピストンやシリンダヘ
ツド等の機械部品の正確な外型を型どつた形状に
される。空所Ｃの中には中子３…が設けられてい
る。この中子３は図面では円柱状となつている
が、実際には、三次元光弾性法によつて応力解析
を実施しようとする機械部品の内部の中空部作製
に適した形状に作られる。このようにして形成さ
れた上型２の湯口２ａからエポキシ樹脂液等の液
状プラスチツクを注入し固化させることによつて
所要の形状のプラスチツク模型を製作できるよう
になつている。 Note that although the cross section of space C in the drawing is rectangular, it is actually the exact outer shape of mechanical parts such as engine pistons and cylinder heads whose stress is analyzed by the three-dimensional photoelastic method. is made into a molded shape. Inside the empty space C, a core 3 is provided. Although the core 3 has a cylindrical shape in the drawing, it is actually made in a shape suitable for producing a hollow part inside a mechanical part in which stress analysis is to be performed by the three-dimensional photoelastic method. By injecting liquid plastic such as epoxy resin liquid through the sprue 2a of the upper mold 2 formed in this manner and solidifying it, a plastic model of a desired shape can be manufactured.
なお、下型１と上型２と中子３とは全て、アル
ミン酸ナトリウム（35.3％Al2O3、23.8％Na2O、
モル比ｎ＝1.1）と水とアルミナ砂とを混練して
作製された水溶性のものであり、骨材はアルミナ
砂となる。また、下型１の上面全部と上型２の下
面全部および中子３の外面全部には各々シリコン
ゴム層４（主剤30に対し硬化剤１の割合で配合）
が形成されるとともに、下型１の凹部に中子３を
据え付けた状態で露出する下型１と中子３、およ
び上型２のシリコンゴム層４の全表面にはグリー
ス状のシリコン樹脂による離型層５が形成されて
いる。 Note that the lower mold 1, upper mold 2, and core 3 are all made of sodium aluminate (35.3% Al 2 O 3 , 23.8% Na 2 O,
It is a water-soluble material made by kneading water and alumina sand with a molar ratio n=1.1), and the aggregate is alumina sand. In addition, a silicone rubber layer 4 (mixed at a ratio of 30 parts of the main material to 1 part of the curing agent) is provided on the entire upper surface of the lower mold 1, the entire lower surface of the upper mold 2, and the entire outer surface of the core 3.
is formed, and the entire surface of the lower mold 1 and core 3 exposed when the core 3 is installed in the recess of the lower mold 1, as well as the silicone rubber layer 4 of the upper mold 2 is coated with a grease-like silicone resin. A release layer 5 is formed.
次に上記のように構成された鋳型Ａの作製方法
および鋳型Ａを用いて行うこの発明の方法につい
て説明する。 Next, a method for producing mold A configured as described above and a method of the present invention using mold A will be described.
まず、上記したアルミン酸ナトリウムをアルミ
ン酸ナトリウムの４倍の重量の水で希釈し、次に
アルミン酸ナトリウムの５倍の重量のアルミナ砂
を加えて撹拌し鋳型構成砂を作製する。 First, the above-mentioned sodium aluminate is diluted with water whose weight is four times that of the sodium aluminate, and then alumina sand whose weight is five times that of the sodium aluminate is added and stirred to prepare mold-constituting sand.
次に三次元光弾性法によつて応力解析を実施し
ようとする機械部品（エンジンのシリンダヘツド
等）の木型（主型ならびに中子取り）へ鋳型構成
砂を入れて突き固め鋳型構成砂にCO2ガスを所定
時間、15／minの供給量で流す。このCO2ガス
によつて鋳型構成砂の一部は以下に示す周知の反
応式に従つて粘結剤になり、鋳型構成砂は硬化す
る。 Next, mold-forming sand is poured into a wooden mold (main mold and core) of a mechanical part (engine cylinder head, etc.) for which stress analysis is to be performed using the three-dimensional photoelastic method, and tamped to form mold-forming sand. Flow CO 2 gas at a supply rate of 15/min for a specified period of time. With this CO 2 gas, a part of the sand forming the mold becomes a binder according to the well-known reaction formula shown below, and the sand forming the mold hardens.
nNa2O／Al2O3・mH2O＋nH2O＝nNa2CO3＋
2Al（OH）3＋（ｍ−３）H2O
このように硬化した鋳型構成砂の片側半分を下
型１、他側半分を上型２とする。nNa 2 O／Al 2 O 3・mH 2 O＋nH 2 O=nNa 2 CO 3 ＋
2Al(OH) 3 +(m-3)H 2 O One half of the mold constituting sand hardened in this way is used as a lower mold 1, and the other half is used as an upper mold 2.
一方、中子３は、鋳物用シエル中子（凸型）を
基に石膏により凹型をとり、この凹型に上記鋳型
構成砂を入れて上記と同様にCO2ガスを通して硬
化させ、作製する。 On the other hand, the core 3 is produced by making a concave mold out of plaster based on a shell core (convex type) for casting, putting the mold-forming sand into the concave mold, and hardening it by passing CO 2 gas in the same manner as above.
次に上記のように形成された下型１の凹部側の
一面全部と上型２の凹部側の一面全部および中子
３の全表面に各々骨材の附着防止と型ばなれ向上
のためにシリコンゴムを塗布してシリコンゴム層
４を形成する。そして下型１と上型２とに中子３
…を据え付け、その後には離剤としてグリース状
のシリコン樹脂を塗布して離型層５を形成する。 Next, in order to prevent aggregate from adhering to the entire surface of the concave side of the lower mold 1, the entire surface of the concave side of the upper mold 2, and the entire surface of the core 3 formed as described above, to prevent aggregate from adhering and to improve mold separation. A silicone rubber layer 4 is formed by applying silicone rubber. Then, core 3 is placed in the lower mold 1 and upper mold 2.
... is installed, and then a grease-like silicone resin is applied as a release agent to form a release layer 5.
次に下型１と上型２とを第１図に示すように合
わせて空所Ｃを形成し、所定の恒温炉に入れて鋳
型温度を125℃〜130℃に上げ、保温する。次いで
溶解槽で調整されたエポキシ樹脂液（125℃、主
剤３に対し硬化剤１の割合で配合）を湯口２ａか
ら空所Ｃに注入する。そして恒温炉内で所定の硬
化時間（例えば125℃×36Hr）の間放置する。空
所Ｃに注入されたエポキシ樹脂液は鋳型内面に塗
布されたシリコンゴム層４と離型層５に接触した
状態で固化し、鋳型Ａ内にはプラスチツク鋳物が
形成される。このためプラスチツク鋳物の鋳肌に
鋳型Ａの骨材が付着せず、滑らかな鋳肌に仕上が
る。 Next, the lower mold 1 and the upper mold 2 are brought together to form a cavity C as shown in FIG. 1, and the molds are placed in a predetermined thermostatic oven and the mold temperature is raised to 125 DEG C. to 130 DEG C. and kept warm. Next, an epoxy resin liquid (125° C., blended at a ratio of 1 part curing agent to 3 parts main resin) prepared in the dissolution tank is injected into the cavity C through the sprue 2a. Then, it is left in a constant temperature oven for a predetermined curing time (for example, 125°C x 36 hours). The epoxy resin liquid injected into the cavity C solidifies while in contact with the silicone rubber layer 4 and mold release layer 5 coated on the inner surface of the mold, and a plastic casting is formed within the mold A. Therefore, the aggregate of mold A does not adhere to the surface of the plastic casting, resulting in a smooth surface.
硬化時間の経過後、毎時２℃ずつ炉内温度を下
げ、常温になつた時点で恒温炉から鋳型Ａを取り
出す。取り出した鋳型Ａは内部のプラスチツク鋳
物に損傷を与えないように注意してハンマで概ね
破砕して型ばらしする。ここでプラスチツク鋳物
と鋳型Ａとの間にはシリコンゴム層４と離型層５
があるため、プラスチツク鋳物と鋳型Ａの大部分
とは容易に分離する。 After the curing time has elapsed, the temperature inside the furnace is lowered by 2° C. per hour, and when the temperature reaches room temperature, mold A is taken out from the constant temperature furnace. The removed mold A is roughly crushed with a hammer to break it apart, being careful not to damage the plastic casting inside. Here, between the plastic casting and the mold A, there is a silicone rubber layer 4 and a mold release layer 5.
Because of this, the plastic casting and most of mold A are easily separated.
次に鋳型Ａの一部が付着して残つているプラス
チツク鋳物を水槽内の水に１〜２時間漬ける。こ
れにより鋳物に付着して残つていた鋳型構成砂は
ほとんど水に溶けて鋳物と分離する。なお、プラ
スチツク鋳物内の中空部に入つている鋳型構成砂
は中空部に水流を当てることによつて溶解し中空
部から容易に排出できる。したがつて冷却水ジヤ
ケツトを有するシリンダヘツドのように複雑な形
の中空部を有する部品のプラスチツク鋳物をこの
発明の方法によつて高い精度で製作できる。 Next, the plastic casting to which part of mold A remains is soaked in water in a water tank for 1 to 2 hours. As a result, most of the mold-constituting sand that remained attached to the casting is dissolved in water and separated from the casting. The sand constituting the mold contained in the hollow part of the plastic casting can be dissolved and easily discharged from the hollow part by applying a stream of water to the hollow part. Therefore, plastic castings of parts having complex shaped hollows, such as cylinder heads with cooling water jackets, can be produced with high precision by the method of the invention.
なお、鋳型構成砂は鋳物形成後に粘結剤を水洗
することによつて再利用できる。 Note that the sand constituting the mold can be reused by washing away the binder with water after forming the casting.
製作したプラスチツク模型は三次元光弾性法応
力解析手段に使用する。 The produced plastic model will be used for three-dimensional photoelastic stress analysis.
以上説明したようにこの発明は、主型と中子と
を水溶性材料で形成し、主型の内面全部と中子の
全表面とに各々シリコンゴム層を形成するととも
に、中子を組み入れた主型に液状プラスチツクを
注入固化させてプラスチツク鋳物を形成し、この
後に主型と中子とを水で型ばらししてプラスチツ
ク鋳物から除去するようにしたものであり、主型
に注入した液状プラスチツクはシリコンゴム層に
囲まれて主型と中子とに直接接触しない状態で固
化するため、プラスチツク鋳物の鋳肌に鋳型の骨
材が付着せず、滑らかな鋳肌に仕上がる。また、
シリコンゴム層は鋳型とプラスチツク鋳物との離
型の機能もなし、水による主型および中子とプラ
スチツク鋳物との分離が容易になる。したがつて
冷却水ジヤケツトを有するシリンダヘツドのよう
に複雑な形の中空部を有するエンジン部品等のプ
ラスチツク鋳物を製作する場合に、鋳造したプラ
スチツク鋳物の中空部から鋳型を水で崩壊させて
容易に除去することができるため、上記複雑な形
状のプラスチツク鋳物を容易に製作できる。 As explained above, the present invention includes forming the main mold and the core from a water-soluble material, forming a silicone rubber layer on the entire inner surface of the main mold and the entire surface of the core, and incorporating the core. Liquid plastic is injected into the main mold and solidified to form a plastic casting, and then the main mold and core are separated with water and removed from the plastic casting. Because it is surrounded by a silicone rubber layer and solidifies without coming into direct contact with the main mold or core, mold aggregate does not adhere to the surface of the plastic casting, resulting in a smooth surface. Also,
The silicone rubber layer also does not have the function of separating the mold from the plastic casting, making it easy for water to separate the main mold and core from the plastic casting. Therefore, when manufacturing plastic castings such as engine parts that have complex-shaped hollow parts such as cylinder heads with cooling water jackets, it is easy to collapse the mold with water from the hollow part of the plastic casting. Since it can be removed, plastic castings with the above-mentioned complex shapes can be easily manufactured.
すなわちこの発明の方法によれば、三次元光弾
性法応力解析手段に使用される模型を容易にかつ
高い精度で製作することができる。 That is, according to the method of the present invention, a model used in a three-dimensional photoelastic stress analysis means can be manufactured easily and with high precision.
図面はこの発明の方法の実施に使用される鋳型
を示すもので、第１図は断面略図、第２図は第１
図のＢ部分の拡大図である。
Ａ……主型、Ｃ……空所、３……中子、４……
シリコンゴム層。
The drawings show a mold used for carrying out the method of the present invention, FIG. 1 is a schematic cross-sectional view, and FIG.
It is an enlarged view of part B of the figure. A... Main mold, C... Blank space, 3... Core, 4...
silicone rubber layer.
Claims (1)
材料で形成し、上記空所を形成する主型の内面全
部と、中子の全外面とに各々シリコンゴム層を形
成するとともに、中子を組み入れた主型の空所に
液状プラスチツクを注入し固化させてプラスチツ
ク鋳物を形成し、このプラスチツク鋳物の形成後
に上記主型と中子とを型ばらしし、プラスチツク
鋳物を取り出すことを特徴とする水溶性中子を用
いたプラスチツク鋳造方法。1. A main mold having a cavity and a core are each made of a water-soluble material, and a silicone rubber layer is formed on the entire inner surface of the main mold forming the cavity and on the entire outer surface of the core. A plastic casting is formed by injecting liquid plastic into the cavity of a main mold in which the core is incorporated and solidifying it, and after forming the plastic casting, the main mold and the core are separated from the mold and the plastic casting is taken out. A plastic casting method using a water-soluble core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1072383A JPS59136214A (en) | 1983-01-26 | 1983-01-26 | Plastic casting method using watersoluble core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1072383A JPS59136214A (en) | 1983-01-26 | 1983-01-26 | Plastic casting method using watersoluble core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59136214A JPS59136214A (en) | 1984-08-04 |
| JPS645806B2 true JPS645806B2 (en) | 1989-02-01 |
Family
ID=11758201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1072383A Granted JPS59136214A (en) | 1983-01-26 | 1983-01-26 | Plastic casting method using watersoluble core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59136214A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH062352B2 (en) * | 1985-05-07 | 1994-01-12 | 旭有機材工業株式会社 | Molding method for curable plastics |
| FR2613659A1 (en) * | 1987-04-13 | 1988-10-14 | Peugeot | Method of manufacturing rigid and hollow components which may or may not have drafts (undercuts) |
| JP2530276Y2 (en) * | 1990-11-21 | 1997-03-26 | 日野自動車工業株式会社 | Sand core for resin molding |
| FI922716A7 (en) * | 1992-06-11 | 1993-12-12 | Harri Sahari | Method for manufacturing plastic parts |
| JP2760770B2 (en) * | 1995-12-27 | 1998-06-04 | 株式会社筒井プラスチック | Manufacturing method of plastic injection molded hollow product with complicated shape and water-soluble core used for this |
| EP1234647A1 (en) * | 2001-02-23 | 2002-08-28 | Vantico AG | Method of producing models by using a water soluble core |
| US20070145633A1 (en) * | 2003-12-12 | 2007-06-28 | Shonan Design Co., Ltd. | Method for manufacturing hollow model |
| JP2021051244A (en) * | 2019-09-26 | 2021-04-01 | 株式会社エムシーピー | Breast model composed of silicone elastic body having pressure sensor and manufacturing method therefor |
| CN118288504A (en) * | 2023-01-05 | 2024-07-05 | 汉达精密电子(昆山)有限公司 | Positioning design in one-piece handle molding |
-
1983
- 1983-01-26 JP JP1072383A patent/JPS59136214A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59136214A (en) | 1984-08-04 |
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