JPS59130645A - Mold forming method - Google Patents
Mold forming methodInfo
- Publication number
- JPS59130645A JPS59130645A JP446983A JP446983A JPS59130645A JP S59130645 A JPS59130645 A JP S59130645A JP 446983 A JP446983 A JP 446983A JP 446983 A JP446983 A JP 446983A JP S59130645 A JPS59130645 A JP S59130645A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- binder
- molding sand
- sand
- soln
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は水溶性粘結剤を添加混線した鋳物砂を使用して
造型する鋳型造型方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold making method using foundry sand mixed with a water-soluble binder.
近年、使用済鋳物砂の廃棄の問題、合成樹脂系粘結剤の
価格の高脳、またシェルモールド法、コールドボックス
法、バードックス法等においては。In recent years, there have been problems with the disposal of used foundry sand, the high price of synthetic resin binders, and the shell mold method, cold box method, bardox method, etc.
悪臭ガス、有害ガスの発生、それら装置の腐蝕等の問題
が生じている。そのために、最近水溶性糊を粘結剤とす
る造型法が見直されこの種の造型法における改良案が種
々提案されている。しかし、いずれも鋳型硬度が不足し
鋳型硬度を高くするために、水溶性粘結剤の添加量を増
やすと、砂の流動性が低下して砂の充填性が悪くなると
ともに、ガス欠陥による鋳造不良が発生し、さらには乾
燥硬化時間が長くなって生産性が低下し、また粘結剤の
増加に伴い鋳型コストが高くなるなどの問題があった。Problems such as the generation of foul-smelling gases and harmful gases, and corrosion of these devices are occurring. For this reason, the molding method using water-soluble glue as a binder has recently been reviewed, and various improvements in this type of molding method have been proposed. However, in both cases, the mold hardness is insufficient, and when increasing the amount of water-soluble binder added to increase the mold hardness, the fluidity of the sand decreases and the filling properties of the sand deteriorate, and the casting process due to gas defects. There were problems such as defects occurring, and furthermore, the drying and curing time became longer, reducing productivity, and mold costs increased due to the increase in the amount of binder.
本発明はこれらの問題点に鑑みて成されたものであって
、水溶性粘結剤の添加量を増やすことなく、高い硬度の
鋳型を得ることができる鋳型造型方法を提供することを
目的とするものである。The present invention was made in view of these problems, and an object of the present invention is to provide a mold making method that can obtain a mold with high hardness without increasing the amount of water-soluble binder added. It is something to do.
以下に、本発明を実施例に基づき説明する。The present invention will be explained below based on examples.
第１図に示すように、木製の模型付模型板（１）上面に
鋳枠（２）を載置して該模型付模型板（１）と鋳枠（２
）とによって画成された空間部に、焙焼デキストリン、
酸化澱粉、アルファ澱粉、澱粉エステル、澱粉エーテル
、ハイアミロース等の水溶性粘結剤を添加混練した鋳物
砂（Ｓ）（以下、鋳物砂という）を押し固めながら充填
して該鋳物砂（Ｓ）を所定の密度Ｉこ充填するとともに
、該鋳物砂（Ｓ）上面を鋳枠（２）上面と略同−面にな
るようにかきならしたあと、第２図に示すように、下面
にシートパツキン（３）を貼着し、かつ該シートパツキ
ン（３）下面に１１通する通気孔（４）を複数個備える
とともに該通気孔（４）にベントプラグ（図示せず）を
埋設した描成の板材（５） ’ｅ、前記鋳枠（２）上面
にシートパツキン（３）を介して気密状に＠置するとと
もに、これらの模型付模型板（１）、鋳枠（２）、及び
板材（５）を一体重に反転し、該鋳物砂（Ｓ）から模型
付模型板（１）を離型する（第３図）。なお、この際、
該鋳物砂（Ｓ）は所定の密度に充填されていて砂粒子間
には、水溶性粘結剤の粘性が作用しているため、模型付
模型板（］）を離型しても、型組れすることはない。次
いで、第４図に示す如く、該鋳物砂（Ｓ）の型表面に水
溶性粘結剤の水溶液或いは水溶性粘結剤と耐熱性骨材と
を適正比率に配合した水溶液をスプレー装置（６）で霧
状に塗布し、該鋳物砂（Ｓ）の型表面に、均一に滲込ま
せる。塗布後、エヤー供給孔（７）を備えたカバ一部材
（８）を鋳枠（２）内の鋳物砂（Ｓ）を覆うようにして
被せたあと、エヤー供給孔（７）よりカバ一部材（８）
内に常温、或いは加熱圧縮空気を供給すると、該圧縮空
気は前記水溶液を滲込ませた該鋳物砂の型表面から該鋳
物砂中を通って通気孔（４）から外部に排気される。こ
のようにして、所定時間、該鋳物砂中に型表面から圧縮
空気を通気すると、該鋳物砂は型表面より順に乾燥硬化
されていき、やがて全体が乾燥硬化された鋳型ＣＭ）が
成型される。特に、前記水溶液を滲込ませた該鋳物砂の
型表面の鋳型硬度は鋳型内部より極めて高くなる。その
後、板材（５）及びカバ一部材（８）を、第６図に示ず
如く、除去し、前記と同様にして硬化成型した他の半分
の鋳型と重ね合わせて一対の完成鋳型とするものである
。また、第７図に示す如く、圧縮空気の通気時間を短縮
し、前記水溶液を滲込ませた鋳物砂（Ｓ）の型表面のみ
硬化して未硬化部分を除去するバックアップタイプの鋳
型（Ｍ）′としてもよい。As shown in Fig. 1, a casting flask (2) is placed on the upper surface of a wooden model board (1), and the casting flask (2) is placed on top of the wooden model board (1).
) in the space defined by the torrefied dextrin,
Foundry sand (S) to which a water-soluble binder such as oxidized starch, alpha starch, starch ester, starch ether, or high amylose has been added and kneaded (hereinafter referred to as foundry sand) is compacted and filled. After filling the molding sand (S) with a predetermined density and smoothing the upper surface of the molding sand (S) so that it is approximately flush with the upper surface of the flask (2), a sheet packing is placed on the lower surface as shown in Fig. 2. (3), a plurality of 11 ventilation holes (4) are attached to the bottom surface of the sheet packing (3), and a vent plug (not shown) is embedded in the ventilation hole (4). The plate material (5) 'e is placed on the upper surface of the flask (2) in an airtight manner via the sheet packing (3), and the model plate with model (1), the flask (2), and the plate material ( 5) is inverted to one weight, and the model plate with model (1) is released from the molding sand (S) (FIG. 3). In addition, at this time,
The foundry sand (S) is packed to a predetermined density, and the viscosity of the water-soluble binder acts between the sand particles, so even if the model plate with model (]) is released, the mold will not hold. There will be no grouping. Next, as shown in FIG. 4, an aqueous solution of a water-soluble binder or an aqueous solution of a water-soluble binder and a heat-resistant aggregate in an appropriate ratio is sprayed onto the mold surface of the foundry sand (S) using a spray device (6). ) in the form of a mist, and let it permeate uniformly onto the mold surface of the foundry sand (S). After coating, cover the molding sand (S) in the flask (2) with a cover member (8) equipped with an air supply hole (7), and then insert the cover member (8) through the air supply hole (7). (8)
When room temperature or heated compressed air is supplied into the mold, the compressed air passes from the mold surface of the molding sand impregnated with the aqueous solution, passes through the molding sand, and is exhausted to the outside from the vent hole (4). In this way, when compressed air is passed through the molding sand from the mold surface for a predetermined period of time, the molding sand is dried and hardened sequentially from the mold surface, and eventually a mold CM) in which the entire mold is dried and hardened is formed. . In particular, the mold surface of the molding sand impregnated with the aqueous solution has a much higher mold hardness than the inside of the mold. Thereafter, the plate material (5) and the cover member (8) are removed as shown in Fig. 6, and the other half of the mold, which has been hardened and molded in the same manner as described above, is superimposed to form a pair of completed molds. It is. In addition, as shown in Fig. 7, a back-up type mold (M) which shortens the ventilation time of compressed air, hardens only the mold surface of the molding sand (S) impregnated with the aqueous solution, and removes the unhardened portion. ’ may also be used.
なお、前記実施例においては、模型付模型板（１）と鋳
枠（２）とによって画成された空間部に鋳物砂（Ｓ）を
押固めながら所定の密度に充填するようにしたが、吹込
み、スクィーズ、振動等で所定の密度に充填するように
してもよい。また、前記実施例においては、反転後、模
型付模型板（１）を鋳物砂（Ｓ）から離型して該鋳物砂
（Ｓ）の型表面に水溶液を塗布し、その後、該鋳物砂を
乾燥硬化するようにしたが、模型付模型板（１）と鋳枠
（２）とによって画成された空間部に鋳物砂（Ｓ）を、
所定密度に充填したあと、該鋳枠（２）を反転すること
なく、模型付模型板（１）を該鋳物砂（Ｓ）から直ちに
離型するとともｊと、該鋳枠（２）下方から該鋳物砂（
Ｓ）の型表面に向けて水溶液を塗布し、その後該鋳物砂
（Ｓ）を型表面から乾燥硬化するようにしてもよい。In addition, in the above embodiment, the space defined by the model plate with model (1) and the casting flask (2) was filled with molding sand (S) to a predetermined density while being compacted. It may be filled to a predetermined density by blowing, squeezing, vibration, etc. Further, in the above embodiment, after reversing, the model plate with model (1) is released from the molding sand (S), an aqueous solution is applied to the mold surface of the molding sand (S), and then the molding sand is Although the molding sand (S) was allowed to dry and harden in the space defined by the model plate with model (1) and the casting flask (2),
After filling to a predetermined density, the mold plate with model (1) is immediately released from the molding sand (S) without inverting the flask (2), and the mold is removed from below the flask (2). The foundry sand (
An aqueous solution may be applied to the mold surface of S), and then the foundry sand (S) may be dried and hardened from the mold surface.
以上の説明ｌ乙よって明らかなように、本発明によれば
、模型付模型板と鋳枠とによって画成された空間部に、
水溶性粘結剤を合音した鋳物砂を充填成形して抜型した
あと、該鋳物砂の型表面に、水溶性粘結剤の水溶液、或
いは水溶性粘結剤と耐熱性骨材とを適正比率に配合した
水溶液を、略均−に塗布し、その後該鋳物砂を乾燥硬化
するようにしたので、少量の水溶性粘結剤で該鋳物砂の
型表面を所定の鋳型硬度に成型することができるととも
に、多量の水溶性粘結剤を使用する必要がないため、鋳
物砂の流動性が良くなり、さらには、ガス欠陥による鋳
造欠陥がなくなり、また生産性の向上に寄与するなどの
効果を有し、この種の業界に寄与する効果は著大である
。As is clear from the above explanation, according to the present invention, in the space defined by the model plate with model and the casting flask,
After filling and molding molding sand mixed with a water-soluble binder and cutting out the mold, an aqueous solution of the water-soluble binder or a water-soluble binder and heat-resistant aggregate are properly applied to the mold surface of the molding sand. Since the aqueous solution mixed in the ratio was applied approximately evenly and the molding sand was then dried and hardened, the mold surface of the molding sand could be molded to a predetermined mold hardness with a small amount of water-soluble binder. In addition, there is no need to use a large amount of water-soluble binder, which improves the fluidity of the foundry sand, eliminates casting defects due to gas defects, and contributes to improved productivity. , and its contribution to this type of industry is significant.
第１図乃至第７図は本発明の実施例を示す工程図である
。
（１）：模型付模型板 （２）：鋳枠特許出願人 新
東工業株式会ｑ’、’５’、！、、ｐ芽１図
際３図
÷５図
蜂２図
÷４図
’ｌ−ｓ図
÷７図FIGS. 1 to 7 are process diagrams showing an embodiment of the present invention. (1): Model board with model (2): Casting flask patent applicant Shinto Kogyo Co., Ltd. q', '5',! ,, p Bud 1 figure 3 figures ÷ 5 figures Bee 2 figures ÷ 4 figures 'l-s figure ÷ 7 figures
Claims (1)
水溶性粘結剤を添加混練した鋳物砂を所定の密度に充填
したあと、該模型付模型板を該鋳物砂から離型するとと
もに、該鋳物砂の型表面に、水溶性粘結剤の水溶液、或
いは水溶性粘結剤と耐熱性骨材とを適正比率に配合した
水溶液を、略均−に塗布し、その後該鋳物砂を乾燥硬化
することを特徴とする鋳型造型方法。In one space defined by a model board with a model and a casting flask,
After filling molding sand mixed with a water-soluble binder to a predetermined density, the model plate with the model is released from the molding sand, and an aqueous solution of the water-soluble binder is applied to the mold surface of the molding sand. Alternatively, a mold making method characterized in that an aqueous solution containing a water-soluble binder and a heat-resistant aggregate in an appropriate ratio is applied substantially evenly, and then the foundry sand is dried and hardened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP446983A JPS59130645A (en) | 1983-01-14 | 1983-01-14 | Mold forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP446983A JPS59130645A (en) | 1983-01-14 | 1983-01-14 | Mold forming method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59130645A true JPS59130645A (en) | 1984-07-27 |
| JPH0147267B2 JPH0147267B2 (en) | 1989-10-13 |
Family
ID=11584978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP446983A Granted JPS59130645A (en) | 1983-01-14 | 1983-01-14 | Mold forming method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59130645A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04141018A (en) * | 1990-10-02 | 1992-05-14 | Kubota Corp | Lawn mower |
| JP2010524690A (en) * | 2007-04-19 | 2010-07-22 | 南車眉山車輌有限公司 | How to make an integrated core for rail pillows or side frames of rail freight trains |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5428222A (en) * | 1977-08-04 | 1979-03-02 | Daiwa Seisakusho Kk | Method of making mold |
| JPS5451928A (en) * | 1977-09-30 | 1979-04-24 | Daiwa Seisakusho Kk | Method of making cast mold using steam |
-
1983
- 1983-01-14 JP JP446983A patent/JPS59130645A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5428222A (en) * | 1977-08-04 | 1979-03-02 | Daiwa Seisakusho Kk | Method of making mold |
| JPS5451928A (en) * | 1977-09-30 | 1979-04-24 | Daiwa Seisakusho Kk | Method of making cast mold using steam |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04141018A (en) * | 1990-10-02 | 1992-05-14 | Kubota Corp | Lawn mower |
| JP2010524690A (en) * | 2007-04-19 | 2010-07-22 | 南車眉山車輌有限公司 | How to make an integrated core for rail pillows or side frames of rail freight trains |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0147267B2 (en) | 1989-10-13 |
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