JPH01205849A - Method for hardening co2 mold - Google Patents
Method for hardening co2 moldInfo
- Publication number
- JPH01205849A JPH01205849A JP2881788A JP2881788A JPH01205849A JP H01205849 A JPH01205849 A JP H01205849A JP 2881788 A JP2881788 A JP 2881788A JP 2881788 A JP2881788 A JP 2881788A JP H01205849 A JPH01205849 A JP H01205849A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- sodium silicate
- casting
- strength
- sand
- 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 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 28
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 14
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 14
- 239000004576 sand Substances 0.000 claims abstract description 10
- 239000000741 silica gel Substances 0.000 claims abstract description 6
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 6
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 6
- 238000001723 curing Methods 0.000 claims description 9
- 230000018044 dehydration Effects 0.000 claims description 6
- 238000006297 dehydration reaction Methods 0.000 claims description 6
- 239000007884 disintegrant Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 abstract description 11
- 238000000465 moulding Methods 0.000 abstract description 5
- 238000004898 kneading Methods 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 abstract description 2
- 230000001737 promoting effect Effects 0.000 abstract 2
- 238000007664 blowing Methods 0.000 abstract 1
- 230000007423 decrease Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 101100162972 Mus musculus Apom gene Proteins 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Mold Materials And Core Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明はＣＯ２型で製作した鋳造用中子や外型の硬化
方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for curing casting cores and outer molds manufactured using a CO2 mold.
鋳造用の中子や外型として用いられるＣＯ２型は崩壊剤
等を添加した硅砂にけい酸ソーダ溶液を加えて混練した
後造型し、得られた型中にＣＯ２ガスを吹込んでけい酸
ソーダを硬化させることにより十分な強度が得られるよ
うにした鋳型であって、造型後火気中に放置すると、未
反応けい酸ソーダの脱水やシリカゲルの脱水によってさ
らに硬化が進む性質がある。CO2 molds used as cores and outer molds for casting are made by adding a sodium silicate solution to silica sand containing a disintegrating agent, kneading it, and then molding it. CO2 gas is blown into the resulting mold to add sodium silicate. The mold is designed to obtain sufficient strength through hardening, and if it is left in an open flame after molding, it has the property of further hardening due to dehydration of unreacted sodium silicate and dehydration of silica gel.
しかし実際には造型したＣＯ２型を大気中へ数日間放置
した場合、大気中の水分を吸湿して強度が低下し、鋳造
時型が破損したり、型の一部が脱落して鋳物中に混入す
る所謂砂食いなどの欠陥の原因となる不具合があった。However, in reality, if a molded CO2 mold is left in the atmosphere for several days, it absorbs moisture from the atmosphere and its strength decreases, causing the mold to break during casting, or part of the mold to fall off and enter the casting. There was a problem that caused defects such as so-called sand encroachment.
この発明は上記不具合を改善するＣＯ２型の硬化方法を
提供する目的でなされたものである。This invention was made with the object of providing a CO2 type curing method that improves the above-mentioned problems.
〔課題を解決するための手段及び作用〕上記目的を達成
するために、崩壊剤等を添加した硅砂にけい酸ソーダ溶
液を加えて混練した後造型し、得られた型内にＣＯ２ガ
スを吹込んで型を硬化させてＣＯ２型を製作すると共に
、上記ＣＯ２型を低湿度雰囲気の恒温室内に放置してけ
い酸ソーダ及びシリカゲルの脱水を促進させることによ
り、圧縮強度が高く、かつ表面安定性の良好なＣＯ２型
が得られるようにしたＣＯ２型の硬化方法を提供するも
のである。[Means and effects for solving the problem] In order to achieve the above object, a sodium silicate solution is added to silica sand to which a disintegrant has been added, the mixture is kneaded, and then molded, and CO2 gas is blown into the resulting mold. By hardening the mold and manufacturing a CO2 mold, the CO2 mold is left in a constant temperature room with a low humidity atmosphere to accelerate dehydration of the sodium silicate and silica gel, thereby achieving high compressive strength and surface stability. The present invention provides a CO2 type curing method that allows a good CO2 type to be obtained.
この発明の一実施例を図面を参照して詳述する。 An embodiment of the present invention will be described in detail with reference to the drawings.
この発明に使用するＣＯ２型は、従来同様崩壊剤を添加
した硅砂中にけい酸ソーダ溶液を加えて混練した後これ
を用いて造型し、得られた型中にＣＯ２ガスを吹込んで
砂粒中に付着したけい酸を硬化させることにより型全体
を硬化させたもので、このときの硬化反応は次式のよう
になる。The CO2 mold used in this invention is made by adding a sodium silicate solution to silica sand to which a disintegrant has been added, kneading it, and then molding the resulting mold. The entire mold is cured by curing the attached silicic acid, and the curing reaction at this time is as shown in the following equation.
Ｎｇ２０・ｍ５ｉ０２ （＋＋ｎ＋ｘ）ＨｔＯ＋ＣＯｔ
＝ Ｎ１２ＧＯ１−ｘ）ｌ＋ｏ＋＋ａ（ＳｉＯ２・ｎＨ
ｔＯ）なお、ｍ：けい酸ソーダのモル比
ｎ：けい酸ソーダの含水量
Ｘ：炭酸ソーダの結晶水のモル数
上記反応でシルカゲルと炭酸ソーダが生成され、特にシ
リカゲルが強固な結合力を有することから、これが砂粒
を被覆することにより十分な強度を有するＣＯ２型が得
られるものと考えられる。Ng20・m5i02 (++n+x)HtO+COt
= N12GO1-x)l+o++a(SiO2・nH
tO) Note that m: molar ratio of sodium silicate n: water content of sodium silicate Therefore, it is thought that by coating the sand grains with this, a CO2 type with sufficient strength can be obtained.
そして得られたＣＯ２型を大気中へ放置すると未反応け
い酸ソーダや上記シリカゲルの脱水によりさらに硬化が
進むが湿度の多い大気中へ放置した場合吸湿して逆に強
度が低下する。If the resulting CO2 type is left in the atmosphere, it will further harden due to the dehydration of the unreacted sodium silicate and the silica gel, but if it is left in a humid atmosphere, it will absorb moisture and its strength will decrease.
そこでこの発明では、上記方法により造型した中子が外
型を湿度５０％以下の低湿度雰囲気を維持した恒温室へ
２４時間放置して未反応けい酸ソーダ及びシリカゲルの
脱水を促進させたもので、得られたＣＯ２型は最高強度
が得られると同時に、表面安定性も向上し、鋳造に使用
する原型が破損したり、一部が破損して鋳物中に混入し
、砂食いなどの欠陥の原因となることもなく、品質の良
好な鋳物が得られるようになった。Therefore, in this invention, the core molded by the above method is made by leaving the outer mold in a constant temperature room maintaining a low humidity atmosphere of 50% or less for 24 hours to accelerate dehydration of unreacted sodium silicate and silica gel. The obtained CO2 mold has the highest strength and at the same time has improved surface stability, which prevents defects such as sand erosion and damage to the master mold used for casting, or parts of the mold that are broken and mixed into the casting. Castings of good quality can now be obtained without causing any problems.
また上記発明の硬化方法で得られたＣＯ２型の強度を確
認するため、次のような圧縮強度の試験を行った。Further, in order to confirm the strength of the CO2 type obtained by the curing method of the above invention, the following compressive strength test was conducted.
試験方法としてはＪ Ｉ Ｓ ２２８０３．２８０４に
準じて第１図に示す器具を使用して、まず多数の孔４ａ
を有する台４に枠１を取付け、この枠１内に上記方法に
使用したＣＯ２型と同じ材料を試験片２として投入し、
サンドランマにより３回はど突き固めて高さを５０±１
鰭とした。The test method is based on JIS 22803.2804, using the equipment shown in Figure 1, and first making a large number of holes 4a.
Attach the frame 1 to a stand 4 having a
Tamped three times with a sand drummer to a height of 50±1.
It was made into a fin.
次に枠１上部に密閉栓３を取付けて、この密閉栓３の流
入口３ａよりＣＯ２ガスを１ ｋｇ ／ ｃｄの圧力で
２０秒間試験片２内へ吹込んで硬化させた後枠１内より
取出して温度２４±３℃、湿度４５＋３％の恒温室内へ
２４時間放置した。Next, a sealing plug 3 is attached to the upper part of the frame 1, and CO2 gas is blown into the test piece 2 for 20 seconds at a pressure of 1 kg/cd from the inlet 3a of the sealing plug 3 to cure it, and then taken out from the inside of the frame 1. The sample was left in a constant temperature room at a temperature of 24±3° C. and a humidity of 45+3% for 24 hours.
その後恒温室より取出した試験片２を圧縮試験機にかけ
て圧縮し、破壊試験を行ったところ第２図に示すような
結果が得られた。Thereafter, the test piece 2 taken out from the constant temperature room was compressed using a compression tester and subjected to a destructive test, and the results shown in FIG. 2 were obtained.
この図から明らかなように、造型後火気中に放置した従
来のＣＯ２型に比べて、この発明の硬化方法により硬化
したＣＯ２型の圧縮強度が約１．６倍も向上したことを
確認することができた。As is clear from this figure, it can be confirmed that the compressive strength of the CO2 mold cured by the curing method of the present invention was improved by about 1.6 times compared to the conventional CO2 mold that was left in the open flame after molding. was completed.
この発明は以上詳述したように、造型により得られたＣ
Ｏ２型を低湿度雰囲気の恒温室で放置して硬化を促進さ
せたことにより、ＣＯ２型とし最高の強度が得られると
共に、表面安定性が向上するため、品質の高い鋳物が得
られるようになった。As described in detail above, this invention provides C
By leaving the O2 type in a constant temperature room with a low humidity atmosphere to accelerate curing, the CO2 type has the highest strength and improves surface stability, making it possible to produce high quality castings. Ta.
また強度を高めるために添加していた水ガラス等の粘結
剤の低減も図れるため経済的でもある。It is also economical because the amount of binder such as water glass that is added to increase strength can be reduced.
第１図はこの発明方法の効果を確認するために用いた器
具の説明図、第２図は試験結果を示す線図である。
出願人 株式会社 小 松 製 作 所代理人 弁
理士 米 原 正 章FIG. 1 is an explanatory diagram of the equipment used to confirm the effectiveness of the method of this invention, and FIG. 2 is a diagram showing the test results. Applicant Komatsu Manufacturing Co., Ltd. Representative Patent Attorney Masaaki Yonehara
Claims (1)
練した後造型し、得られた型内にＣＯ＿２ガスを吹込ん
で型を硬化させることによりＣＯ＿２型を製作すると共
に、上記ＣＯ＿２型を低湿度雰囲気の恒温室内に放置し
てけい酸ソーダ及びシリカゲルの脱水を促進させること
を特徴とするＣＯ＿２型の硬化方法。A sodium silicate solution is added to silica sand containing a disintegrant, etc., kneaded and then molded, and CO_2 gas is blown into the resulting mold to harden the mold to produce a CO_2 mold. A CO_2 type curing method characterized by accelerating the dehydration of sodium silicate and silica gel by leaving them in a constant temperature room with a humid atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2881788A JPH01205849A (en) | 1988-02-12 | 1988-02-12 | Method for hardening co2 mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2881788A JPH01205849A (en) | 1988-02-12 | 1988-02-12 | Method for hardening co2 mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01205849A true JPH01205849A (en) | 1989-08-18 |
Family
ID=12258957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2881788A Pending JPH01205849A (en) | 1988-02-12 | 1988-02-12 | Method for hardening co2 mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01205849A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101837429A (en) * | 2010-05-31 | 2010-09-22 | 齐齐哈尔轨道交通装备有限责任公司 | Carbon dioxide hardened sodium silicate sand swage sand shooting modeling method |
-
1988
- 1988-02-12 JP JP2881788A patent/JPH01205849A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101837429A (en) * | 2010-05-31 | 2010-09-22 | 齐齐哈尔轨道交通装备有限责任公司 | Carbon dioxide hardened sodium silicate sand swage sand shooting modeling method |
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