JPH04288940A - Method for molding reduced pressure mold - Google Patents
Method for molding reduced pressure moldInfo
- Publication number
- JPH04288940A JPH04288940A JP3076976A JP7697691A JPH04288940A JP H04288940 A JPH04288940 A JP H04288940A JP 3076976 A JP3076976 A JP 3076976A JP 7697691 A JP7697691 A JP 7697691A JP H04288940 A JPH04288940 A JP H04288940A
- Authority
- JP
- Japan
- Prior art keywords
- film
- mold
- plastic
- pattern plate
- reduced pressure
- 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 description 10
- 238000000465 moulding Methods 0.000 title abstract description 6
- 239000004033 plastic Substances 0.000 claims abstract description 20
- 229920003023 plastic Polymers 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000007796 conventional method Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 2
- 239000002985 plastic film Substances 0.000 abstract description 8
- 229920006255 plastic film Polymers 0.000 abstract description 8
- 239000004576 sand Substances 0.000 abstract description 8
- 239000006082 mold release agent Substances 0.000 abstract 2
- 238000003848 UV Light-Curing Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 6
- 239000003960 organic solvent Substances 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000003110 molding sand Substances 0.000 description 2
- KCTAWXVAICEBSD-UHFFFAOYSA-N prop-2-enoyloxy prop-2-eneperoxoate Chemical compound C=CC(=O)OOOC(=O)C=C KCTAWXVAICEBSD-UHFFFAOYSA-N 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 1
- 229920006158 high molecular weight polymer Polymers 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C23/00—Tools; Devices not mentioned before for moulding
- B22C23/02—Devices for coating moulds or cores
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Devices For Molds (AREA)
Abstract
Description
【0001】0001
【産業上の利用分野】本発明は、鋳枠内に充填した乾燥
砂に減圧作用を加えて鋳型を造型する減圧鋳型造型法(
Vプロセス)に関する。[Industrial Application Field] The present invention relates to a vacuum mold making method (decompression mold making method) in which a mold is made by applying a vacuum effect to dry sand filled in a casting flask.
V process).
【0002】0002
【従来の技術】Vプロセスでは、模型板と鋳枠とで画成
された空間内に乾燥砂を充填するのに先立って、模型板
表面にプラスチックフィルムを吸引被着させる必要があ
るが、複雑な形状の鋳型、例えばポケット部や狭くて深
い溝を有する鋳型を造る場合はフィルムの伸びを期待で
きず、これを模型板上に満遍なく密着させることは困難
である。このため、上記欠点を改良すべく、熱硬化性プ
ラスチックの粉末を有機溶剤、あるいは水と有機溶剤中
に分散し、この分散液を模型板表面に付着させたのち、
赤外線で加熱溶融することによりフィルムを形成させる
方法が提案されている。(例えば特公昭58−1938
0号公報)。[Prior Art] In the V process, it is necessary to apply suction to a plastic film on the surface of the model plate before filling the space defined by the model plate and the flask with dry sand. When making a mold with a specific shape, for example, a mold with pockets or narrow, deep grooves, the film cannot be expected to stretch, and it is difficult to evenly adhere the film to the model board. Therefore, in order to improve the above-mentioned drawbacks, thermosetting plastic powder is dispersed in an organic solvent or water and an organic solvent, and after this dispersion is attached to the surface of the model board,
A method has been proposed in which a film is formed by heating and melting with infrared rays. (For example, Tokuko Sho 58-1938
Publication No. 0).
【0003】0003
【発明が解決しようとする課題】しかし、上記従来方法
では、模型板表面にフィルムを形成させるのに比較的長
時間を要する(0.2mmのフィルムで3〜5分間の加
熱)のみならず、このようにして形成したフィルムの硬
度も十分なものとは言えない(ロックウェル硬度R10
〜20)。その結果、鋳型を模型板から分離する際フィ
ルムが破れ、歩留まりが悪いという問題がある。更に、
分散液中の有機溶剤(例えばメタノール)について、臭
気、引火性、毒性等が問題になる。本発明はこのような
問題点を解決することを目的としてなされたものである
。[Problems to be Solved by the Invention] However, the above conventional method not only requires a relatively long time to form a film on the surface of the model board (heating for 3 to 5 minutes with a 0.2 mm film); The hardness of the film formed in this way cannot be said to be sufficient (Rockwell hardness R10).
~20). As a result, there is a problem that the film is torn when separating the mold from the model plate, resulting in poor yield. Furthermore,
Regarding the organic solvent (for example, methanol) in the dispersion, problems such as odor, flammability, and toxicity arise. The present invention has been made to solve these problems.
【0004】0004
【課題を解決するための手段】本発明は上記の目的を達
成するため、紫外線硬化性プラスチックを模型板の表面
に塗布したのち、これに紫外線を照射してフィルムを形
成することを要旨としている。すなわち本発明は、予め
離型材を被覆した鋳型用模型板の表面に紫外線硬化性プ
ラスチックを塗布したのち、これに紫外線を照射してフ
ィルムを形成し、該フィルムが硬化したのち、その表面
に塗型材を塗布し、該塗型材の乾燥後、上記模型板上に
常法により鋳型を造型することを特徴としている。[Means for Solving the Problems] In order to achieve the above object, the gist of the present invention is to apply ultraviolet curable plastic to the surface of a model board and then irradiate it with ultraviolet rays to form a film. . That is, in the present invention, an ultraviolet curable plastic is applied to the surface of a molding model plate that has been coated with a mold release material in advance, and then irradiated with ultraviolet rays to form a film, and after the film is cured, the surface is coated. The method is characterized in that a mold material is applied, and after drying the coated mold material, a mold is formed on the model plate by a conventional method.
【0005】[0005]
【作用】本発明において、紫外線硬化性プラスチックと
しては、エポキシアクリレート、エポキシ、ウレタンア
クリレートが適用できる。これらのプラスチックは常態
では液状のため、有機溶剤や水等の溶媒を必要としない
。これらのプラスチックを模型板表面に付着させる方法
としては、予め離型材を塗布した模型板をプラスチック
液中に浸漬して引上げる方法、プラスチック液を刷毛、
スプレー等により模型板表面に塗布する方法等いずれも
可能である。こうしてプラスチックを模型板表面に付着
させたのち、これに紫外線を照射すると、紫外線の光エ
ネルギーにより重合反応が生じ、単重モノマーが高分子
ポリマーへと変化して、三次元網目構造のフィルムが模
型板表面に形成される。なお、これらの工程を繰り返す
ことにより、厚いプラスチックフィルムを形成させるこ
とも可能である。こうして模型板表面にプラスチックフ
ィルムを形成し、更にその表面に塗型材を塗布したのち
、鋳枠を取り付け、乾燥した鋳物砂を充填する。次に市
販のプラスチック遮蔽膜で上部を被覆し、鋳型内を減圧
して砂を固化させた上、模型板と鋳型とを分離する。[Operation] In the present invention, epoxy acrylate, epoxy, and urethane acrylate can be used as the ultraviolet curable plastic. Since these plastics are normally liquid, they do not require solvents such as organic solvents or water. Methods for attaching these plastics to the surface of the model board include immersing the model board coated with a release agent in advance in plastic liquid and pulling it up, applying the plastic liquid with a brush,
Any method such as applying it to the surface of the model board by spraying or the like is possible. After the plastic is attached to the surface of the model board, when it is irradiated with ultraviolet rays, a polymerization reaction occurs due to the light energy of the ultraviolet rays, and the single monomer changes into a high molecular weight polymer, forming a film with a three-dimensional network structure on the model. Formed on the board surface. Note that by repeating these steps, it is also possible to form a thick plastic film. A plastic film is thus formed on the surface of the model plate, and a coating material is further applied to the surface, and then a casting flask is attached and filled with dry molding sand. Next, the upper part is covered with a commercially available plastic shielding film, the pressure inside the mold is reduced to solidify the sand, and the model plate and mold are separated.
【0006】[0006]
【実施例】次に、本発明の一実施例を図1〜図4に基づ
いて説明する。予め表面に離型材(シリコン系)を被覆
した鋳型用模型板1の表面にスプレーガン2で紫外線硬
化性の液状プラスチックを塗布する(図1)。次に、プ
ラスチック液が塗布された模型板1に紫外線ランプ3に
より紫外線を照射し、模型板1表面にプラスチックフィ
ルム4を形成する(図2)。なおこの時、紫外線が模型
板1表面を均一に照射するよう、複数の紫外線ランプ3
を模型板1の上方及び側方に配置すると共に、模型板1
を水平回転可能なテーブル5上に載置して、該テーブル
5を回転させつつ紫外線を照射する。また紫外線の照射
中は、紫外線ランプ3及び模型板1を図示しないキャビ
ネットで包囲し、紫外線が外部へ洩れないようにする。
このようにして、照射時間1分で厚さ0.2mmのフィ
ルム4を模型板1上に形成した。また、このようにして
形成されたフィルム4のロックウェル硬度はR115で
あった。次に、該プラスチックフィルム4の表面に塗型
材を塗布した後、かかる模型板1の上に減圧可能な鋳枠
6をセットし、鋳型用乾燥砂7を充填する。しかる後、
鋳枠6の上部開口を市販のプラスチック遮蔽膜8で被覆
し、内部の砂7に減圧作用を加えてこれを固化する(図
3)。最後に、この状態のままで模型板1と鋳型9とを
分離する(図4)。[Embodiment] Next, an embodiment of the present invention will be described based on FIGS. 1 to 4. Ultraviolet curing liquid plastic is applied with a spray gun 2 to the surface of a molding model plate 1 whose surface has been coated with a mold release material (silicon type) in advance (FIG. 1). Next, the model board 1 coated with the plastic liquid is irradiated with ultraviolet light from the ultraviolet lamp 3 to form a plastic film 4 on the surface of the model board 1 (FIG. 2). At this time, multiple ultraviolet lamps 3 are used so that the surface of the model board 1 is uniformly irradiated with ultraviolet rays.
are arranged above and on the side of the model board 1, and the model board 1
is placed on a horizontally rotatable table 5, and ultraviolet rays are irradiated while rotating the table 5. During irradiation with ultraviolet rays, the ultraviolet lamp 3 and model board 1 are surrounded by a cabinet (not shown) to prevent the ultraviolet rays from leaking outside. In this way, a film 4 having a thickness of 0.2 mm was formed on the model board 1 with an irradiation time of 1 minute. Further, the Rockwell hardness of the film 4 thus formed was R115. Next, after applying a mold coating material to the surface of the plastic film 4, a molding flask 6 that can be depressurized is set on the model plate 1, and is filled with dry molding sand 7. After that,
The upper opening of the flask 6 is covered with a commercially available plastic shielding film 8, and a vacuum action is applied to the sand 7 inside to solidify it (FIG. 3). Finally, the model plate 1 and the mold 9 are separated in this state (FIG. 4).
【0007】[0007]
【発明の効果】上記のような本発明によれば、模型板表
面にフィルムを形成させる時間を短縮することができる
。すなわち、従来方法で3〜5分間かかったものが1分
で済む(厚さ0.2mmの場合)。また、形成されたフ
ィルムの硬度も高くなる。すなわち、従来のフィルムの
ロックウェル硬度がR10〜20であるのに対し、本発
明のフィルムのそれはR115である。その結果、模型
板と鋳型を分離する際フィルムが破れにくくなる。更に
、本発明で使用する紫外線硬化性プラスチックは常態で
は液状のため、溶媒を必要としない。このため溶媒中に
含まれる有機溶剤に起因する臭気、引火性、毒性等の作
業安全上の問題を回避することができる。According to the present invention as described above, the time required to form a film on the surface of a model board can be shortened. That is, what used to take 3 to 5 minutes in the conventional method only takes 1 minute (in the case of a thickness of 0.2 mm). Moreover, the hardness of the formed film also increases. That is, while the conventional film has a Rockwell hardness of R10 to 20, the film of the present invention has a Rockwell hardness of R115. As a result, the film is less likely to tear when separating the model plate and mold. Furthermore, since the ultraviolet curable plastic used in the present invention is normally liquid, it does not require a solvent. Therefore, work safety problems such as odor, flammability, and toxicity caused by organic solvents contained in the solvent can be avoided.
【図1】本発明の一実施例を説明するための略図であり
、模型板の表面にプラスチックを塗布している状態を示
すものである。FIG. 1 is a schematic diagram for explaining an embodiment of the present invention, and shows a state in which plastic is applied to the surface of a model board.
【図2】本発明の一実施例を説明するための略図であり
、プラスチックが塗布された模型板に紫外線を照射して
いる状態を示すものである。FIG. 2 is a schematic diagram for explaining an embodiment of the present invention, and shows a model board coated with plastic being irradiated with ultraviolet rays.
【図3】本発明の一実施例を説明するための略図であり
、鋳枠内の乾燥砂を減圧作用により固化させた状態を示
すものである。FIG. 3 is a schematic diagram for explaining one embodiment of the present invention, showing a state in which dry sand in a casting flask is solidified by a reduced pressure action.
【図4】本発明の一実施例を説明するための略図であり
、鋳型と模型板とを分離した状態を示すものである。FIG. 4 is a schematic diagram for explaining an embodiment of the present invention, and shows a mold and a model plate in a separated state.
1 模型板 2 スプレーガン 3 紫外線ランプ 4 プラスチックフィルム 5 テーブル 6 鋳枠 7 鋳物用乾燥砂 8 プラスチック遮蔽膜 9 鋳型 1 Model board 2 Spray gun 3. Ultraviolet lamp 4 Plastic film 5 Table 6 Casting flask 7 Dry sand for foundry 8 Plastic shielding film 9 Mold
Claims (1)
の表面に紫外線硬化性プラスチックを塗布したのち、こ
れに紫外線を照射してフィルム4を形成し、該フィルム
4が硬化したのち、その表面に塗型材を塗布し、該塗型
材の乾燥後、上記模型板1上に常法により鋳型9を造型
することを特徴とする減圧鋳型の造型法。[Claim 1] Mold model plate 1 coated with mold release material in advance
After applying an ultraviolet curable plastic to the surface of the plastic, it is irradiated with ultraviolet rays to form a film 4. After the film 4 is cured, a coating material is applied to the surface of the coating material, and after drying of the coating material, the above-mentioned A method for making a vacuum mold, characterized by forming a mold 9 on a model plate 1 by a conventional method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3076976A JPH04288940A (en) | 1991-03-15 | 1991-03-15 | Method for molding reduced pressure mold |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3076976A JPH04288940A (en) | 1991-03-15 | 1991-03-15 | Method for molding reduced pressure mold |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04288940A true JPH04288940A (en) | 1992-10-14 |
Family
ID=13620819
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3076976A Pending JPH04288940A (en) | 1991-03-15 | 1991-03-15 | Method for molding reduced pressure mold |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04288940A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1897635A1 (en) * | 2005-06-13 | 2008-03-12 | Sintokogio, Ltd. | Process for molding molding flask-free upper and lower casting molds, apparatus therefor and method for placing core |
-
1991
- 1991-03-15 JP JP3076976A patent/JPH04288940A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1897635A1 (en) * | 2005-06-13 | 2008-03-12 | Sintokogio, Ltd. | Process for molding molding flask-free upper and lower casting molds, apparatus therefor and method for placing core |
EP1897635A4 (en) * | 2005-06-13 | 2009-07-22 | Sintokogio Ltd | Process for molding molding flask-free upper and lower casting molds, apparatus therefor and method for placing core |
US7823621B2 (en) | 2005-06-13 | 2010-11-02 | Sintokogio, Ltd. | Method for making flaskless upper and lower molds, an apparatus therefor, and a method for placing a core |
US8061406B2 (en) | 2005-06-13 | 2011-11-22 | Sintokogio, Ltd. | Method for making flaskless upper and lower molds, an apparatus therefor, and a method for placing a core |
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