JPS6146220B2 - - Google Patents
Info
- Publication number
- JPS6146220B2 JPS6146220B2 JP57122041A JP12204182A JPS6146220B2 JP S6146220 B2 JPS6146220 B2 JP S6146220B2 JP 57122041 A JP57122041 A JP 57122041A JP 12204182 A JP12204182 A JP 12204182A JP S6146220 B2 JPS6146220 B2 JP S6146220B2
- Authority
- JP
- Japan
- Prior art keywords
- molding sand
- mold
- powder
- sand
- self
- 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
- 239000003110 molding sand Substances 0.000 claims description 20
- 239000000843 powder Substances 0.000 claims description 11
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 10
- 239000004115 Sodium Silicate Substances 0.000 claims description 7
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 7
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 6
- 239000005011 phenolic resin Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 239000006260 foam Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 11
- 239000004576 sand Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 235000019353 potassium silicate Nutrition 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000004794 expanded polystyrene Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920003986 novolac Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Description
本発明は珪酸ソーダを粘結材として用いる無機
系自硬性鋳型砂に関する。無機系自硬性鋳型砂の
硬化手段としては添加した材料の反応によるも
の、あるいはCO2ガスなどを利用して硬化させる
等の方法が知られている。
無機系自硬性鋳型砂の1つに、珪酸ソーダ(水
ガラス)とフエロシリコン(Fe−Si)などの発
熱性粘結材を含む発熱自硬性鋳型砂がある。これ
は珪砂などの耐火物粒子に金属珪素を含む合金粉
末と水に適宜に稀釈した水ガラスを混合し、水ガ
ラスの加水分解物である苛性ソーダと珪素との発
熱を伴う化学反応により珪酸ソーダの珪酸分を増
加させて耐火物粒子を強固に結合させて鋳型を成
型するものである。
一方、CO2ガスを使用する鋳型として、珪砂な
どの耐火物粒子に珪酸ソーダを添加した混合物で
所要の鋳型を成型し、これにCO2ガスを吹き込ん
で珪酸ソーダ中の珪酸分をゲル化することによつ
て砂粒子を強固に結合させて鋳型を成型するもの
がある。
しかし、上記の2つの鋳型砂は珪酸ソーダを粘
結材としているため、無機系自硬性鋳型砂に比較
すると、溶湯鋳込み後における鋳型砂の崩壊性が
悪いという欠点がある。
鋳型砂の崩壊性を改善するために、黒鉛粉末や
レジン粉末を添加することが知られているが、鋳
物と接触する鋳型表面の崩壊性のみしか改善する
ことができない。鋳型砂に発泡スチロールを添加
することも知られているが、粉末状にして鋳型砂
と一様に混合させることができないので、ブロツ
ク状にして用い造型過程で鋳型内に設置してい
る。このため鋳型表面部には用いることができ
ず、鋳型内部のみに使用されている。
このように従来の崩壊性改善手段では、鋳型表
面と、鋳型内面とで崩壊性助長剤を使い分けなけ
ればならなかつた。
本発明の目的は、崩壊性助長剤を使い分けるこ
となく溶湯鋳込み後の鋳型全体の崩壊性を改善で
きるようにした無機系自硬性鋳型砂を提供するに
ある。
本発明はワツクスを被覆した発泡スチロール粉
末とフエノールレジン粉末の両方を無機系自硬性
鋳型砂に少量添加することによつて、溶湯鋳込み
後の崩壊性を改善したものである。
次に本発明の実施例につき説明する。
実施例 1
第1表に示した配合割合で無機系自硬性鋳型砂
を調整した。この崩壊性助長剤としてはワツクス
を被覆した発泡スチロール粉末とノボラツク系フ
エノールレジン粉末の混合物(重量比で30:70の
割合)を使用した。配合された鋳型砂を縦横300
mm、高さ300mmの木枠内に込めつけて、その中心
部はサーミスター温度計を挿入して反応速度の状
況を調べた。その結合を第2表に示した。
また、同じ自硬性鋳型砂で、直径50mmφ、高さ
50mmの試験片を作製し、硬化させて所定時間経過
後すなわち24時間経過後の強さ、及び更に200〜
1000℃で加熱処理したときの残留抗圧力を比較し
た。
その結果を第1図に示した。図中のaは従来の
自硬性鋳型砂(無添加)、bは本発明によるもの
(0.3重量部添加)を示す。
The present invention relates to inorganic self-hardening molding sand using sodium silicate as a caking agent. Known methods for curing inorganic self-hardening molding sand include a reaction of added materials, or a method of curing using CO 2 gas or the like. One type of inorganic self-hardening molding sand is exothermic self-hardening molding sand containing a heat-generating binder such as sodium silicate (water glass) and ferrosilicon (Fe-Si). This process involves mixing refractory particles such as silica sand with alloy powder containing metallic silicon and water glass appropriately diluted in water, and then producing sodium silicate through a chemical reaction accompanied by heat between caustic soda, which is a hydrolyzate of water glass, and silicon. A mold is formed by increasing the silicic acid content to firmly bond refractory particles. On the other hand, as a mold using CO 2 gas, the required mold is formed from a mixture of refractory particles such as silica sand and sodium silicate added, and CO 2 gas is blown into this to gel the silicic acid content in the sodium silicate. In some cases, sand particles are tightly bound together to form a mold. However, since the above two molding sands use sodium silicate as a binding agent, they have a disadvantage that the molding sand has poor disintegration properties after pouring molten metal compared to inorganic self-hardening molding sands. It is known to add graphite powder or resin powder to improve the collapsibility of molding sand, but this can only improve the collapsibility of the surface of the mold that comes into contact with the casting. It is also known to add expanded polystyrene to molding sand, but since it is not possible to make it into a powder and mix it uniformly with the molding sand, it is used in the form of blocks and placed in the mold during the molding process. Therefore, it cannot be used on the surface of the mold, and is used only inside the mold. As described above, in the conventional disintegration improving means, it is necessary to use different disintegration promoters for the mold surface and the mold inner surface. An object of the present invention is to provide an inorganic self-hardening molding sand that can improve the disintegration properties of the entire mold after pouring molten metal without using different disintegration promoters. The present invention improves the disintegration property after pouring the molten metal by adding a small amount of both wax-coated styrene powder and phenol resin powder to inorganic self-hardening molding sand. Next, examples of the present invention will be described. Example 1 Inorganic self-hardening molding sand was prepared using the blending ratios shown in Table 1. As the disintegration promoter, a mixture of wax-coated styrene foam powder and novolak phenol resin powder (30:70 weight ratio) was used. Mixed molding sand 300mm in length and width
The reactor was placed in a wooden frame with a height of 300 mm and a thermistor thermometer inserted into the center of the frame to check the reaction rate. The bonds are shown in Table 2. Also, with the same self-hardening molding sand, diameter 50mmφ, height
Prepare a 50 mm test piece, harden it, and measure the strength after a predetermined period of time, that is, 24 hours, and further
The residual coercive pressure was compared when heat treated at 1000℃. The results are shown in Figure 1. In the figure, a indicates conventional self-hardening molding sand (no additives), and b indicates the present invention (0.3 parts by weight added).
【表】【table】
【表】
実施例 2
第3表に示した配合割合で炭酸ガス鋳型砂を調
整した。崩壊性助長剤としては実施例1と同じも
のを用いた。この鋳型砂を用いて実施例1と同様
に直径50mmφ、高さ50mmの試験片を成型し、CO2
ガスを吹き込んで硬化させた。その結果を第4表
に示した。また、硬化後の試験片の24時間経過後
の強さ、及び更に200〜1000℃で加熱処理したと
きの残留抗圧力を比較した。
その結果を第2図に示した。図中のaは従来例
(無添加)、bは本発明によるもの(0.3重量部添
加)を示す。[Table] Example 2 Carbon dioxide molding sand was prepared with the blending ratio shown in Table 3. The same disintegration promoter as in Example 1 was used. Using this molding sand, a test piece with a diameter of 50 mmφ and a height of 50 mm was molded in the same manner as in Example 1, and CO 2
It was hardened by blowing gas into it. The results are shown in Table 4. In addition, the strength of the cured test pieces after 24 hours and the residual pressure when further heat treated at 200 to 1000°C were compared. The results are shown in Figure 2. In the figure, a shows the conventional example (no additives), and b shows the one according to the present invention (0.3 parts by weight added).
【表】【table】
【表】
以上の結果、ワツクスを被覆した発泡スチロー
ル粉末とフエノールレジン粉末の混合物の添加量
は珪砂100重量部に対して0.1〜0.5重量部の範囲
が適当であることが認められた。さらに鋳鉄溶湯
による鋳込み試験の結果、従来例に比較し、砂落
し性が大幅に改善され、鋳型全体の崩壊性がよく
なつて作業工数の低減が可能となつた。しかも鋳
造品の鋳肌も美しく品質の向上ができた。[Table] From the above results, it was confirmed that the appropriate amount of the mixture of wax-coated polystyrene powder and phenol resin powder to be added is in the range of 0.1 to 0.5 parts by weight per 100 parts by weight of silica sand. Furthermore, as a result of a casting test using molten cast iron, compared to the conventional example, the ability to remove sand was significantly improved, and the collapsibility of the entire mold was improved, making it possible to reduce the number of work steps. Moreover, the cast surface of the cast product was also beautiful and the quality was improved.
第1〜第2図は本発明の一実施例の鋳型砂と従
来の鋳型砂の処理温度と残留抗圧力の関係を示す
グラフである。
1 and 2 are graphs showing the relationship between processing temperature and residual pressure of molding sand according to an embodiment of the present invention and conventional molding sand.
Claims (1)
砂に、ワツクスを被覆した発泡スチロール粉末と
フエノールレジン粉末とを添加したことを特徴と
する無機系自硬性鋳型砂。1. Inorganic self-hardening molding sand characterized by adding wax-coated styrene foam powder and phenol resin powder to inorganic self-hardening molding sand using sodium silicate as a caking agent.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12204182A JPS5913544A (en) | 1982-07-15 | 1982-07-15 | Inorganic self-curing molding sand |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12204182A JPS5913544A (en) | 1982-07-15 | 1982-07-15 | Inorganic self-curing molding sand |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5913544A JPS5913544A (en) | 1984-01-24 |
JPS6146220B2 true JPS6146220B2 (en) | 1986-10-13 |
Family
ID=14826134
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12204182A Granted JPS5913544A (en) | 1982-07-15 | 1982-07-15 | Inorganic self-curing molding sand |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5913544A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01182116A (en) * | 1988-01-11 | 1989-07-20 | Kinugawa Rubber Ind Co Ltd | Window molding installation structure for automobile |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4725769U (en) * | 1971-04-15 | 1972-11-22 |
-
1982
- 1982-07-15 JP JP12204182A patent/JPS5913544A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4725769U (en) * | 1971-04-15 | 1972-11-22 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01182116A (en) * | 1988-01-11 | 1989-07-20 | Kinugawa Rubber Ind Co Ltd | Window molding installation structure for automobile |
Also Published As
Publication number | Publication date |
---|---|
JPS5913544A (en) | 1984-01-24 |
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