JPS588933B2 - Manufacturing method of heat-generating self-hardening water-soluble mold - Google Patents
Manufacturing method of heat-generating self-hardening water-soluble moldInfo
- Publication number
- JPS588933B2 JPS588933B2 JP2670680A JP2670680A JPS588933B2 JP S588933 B2 JPS588933 B2 JP S588933B2 JP 2670680 A JP2670680 A JP 2670680A JP 2670680 A JP2670680 A JP 2670680A JP S588933 B2 JPS588933 B2 JP S588933B2
- Authority
- JP
- Japan
- Prior art keywords
- sodium aluminate
- weight
- mold
- water
- aluminum powder
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims description 24
- 229910001388 sodium aluminate Inorganic materials 0.000 claims description 24
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 15
- 239000004576 sand Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 230000020169 heat generation Effects 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 14
- 238000005266 casting Methods 0.000 description 11
- 238000004898 kneading Methods 0.000 description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- LWIHDJKSTIGBAC-UHFFFAOYSA-K tripotassium phosphate Chemical compound [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 description 4
- 229910001018 Cast iron Inorganic materials 0.000 description 3
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000160 potassium phosphate Inorganic materials 0.000 description 2
- 235000011009 potassium phosphates Nutrition 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 1
- WPUINVXKIPAAHK-UHFFFAOYSA-N aluminum;potassium;oxygen(2-) Chemical compound [O-2].[O-2].[Al+3].[K+] WPUINVXKIPAAHK-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 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
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/162—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents use of a gaseous treating agent for hardening the binder
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
【発明の詳細な説明】
本発明はアルミニウム合金、銅合金、鋳鉄、鋳鋼などの
鋳造に用いる発熱自硬水溶性鋳型の製造法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an exothermic self-hardening water-soluble mold used for casting aluminum alloys, copper alloys, cast iron, cast steel, etc.
現在鋳物工場では鋳型として、珪砂を骨材にした生型、
無機自硬性鋳型、有機自硬性鋳型及びセメント鋳型が利
用されている。Currently, foundries use green molds made of silica sand as aggregate,
Inorganic self-hardening molds, organic self-hardening molds and cement molds are used.
これらの鋳型の中で生型は比較的小物鋳物に用いられ、
他の自硬性鋳型は強度が高いところから中物、大物の鋳
物に用いられている。Among these molds, green molds are used for relatively small castings,
Other self-hardening molds are used for casting medium and large items due to their high strength.
これらの自硬性鋳型は硬化すると、型ばらしが困難とな
り、特に水ガラスを粘結剤として使用した無機自硬性鋳
型は、鋳物と接した部分がガラス化し、非常に硬いもの
となり、型ばらしが困難である。Once these self-hardening molds harden, it becomes difficult to break them out, and especially inorganic self-hardening molds that use water glass as a binder, the part that comes in contact with the casting becomes vitrified and becomes extremely hard, making it difficult to break them out. It is.
本発明者はさきに、前記の欠点をなくし、鋳込み後、水
により容易に型ばらしができる発熱自硬水溶性鋳型を開
発した。The present inventor has previously developed a heat-generating self-hardening water-soluble mold that eliminates the above-mentioned drawbacks and can be easily released from the mold with water after casting.
（特公昭５４−１３４０７号公報）
この鋳型はアルミナ砂に主としてリン酸カリウムとアル
ミニウム粉末、及びアルミン酸カリウムを配合したもの
から作ったものである。(Japanese Patent Publication No. 54-13407) This mold was made from a mixture of alumina sand, mainly potassium phosphate, aluminum powder, and potassium aluminate.
この鋳型は鉄鋼、鋳鉄及び銅合金のような高温の鋳造に
十分耐え、しかも鋳込み後水により粘結剤に溶解され容
易に型ばらしができる性能を持った鋳型である。This mold can withstand high-temperature casting of steel, cast iron, and copper alloys, and has the ability to dissolve into a binder with water after casting, making it easy to break out of the mold.
しかし、リン酸カリウムはコスト的に高く、また反応生
成物としてリン酸アルミニウムを生成するので、アルミ
ナ砂の回収及び水溶後の溶液の後処理の点で難点がある
。However, since potassium phosphate is expensive and produces aluminum phosphate as a reaction product, there are difficulties in recovery of alumina sand and post-treatment of the solution after it is dissolved in water.
本発明者はこの難点を克服するため、アルミナ砂を骨材
として、単純の系でしかも経済的に安価なアルミン酸ナ
トリウムとアルミニウム粉末の組合せで水溶性鋳型を得
べく試みた。In order to overcome this difficulty, the present inventor attempted to obtain a water-soluble mold by using alumina sand as an aggregate and using a simple and economically inexpensive combination of sodium aluminate and aluminum powder.
しかし、これらの単なる組合せによると、アルミン酸ナ
トリウムとアルミニウム粉末の発熱反応はアルミン酸ナ
トリウムの成分に著しく影響され、鋳型強さが十分得ら
れないばかりでなく、強さのばらつきも大きいこと、ま
た混練造型後十分な強さを得るのに２〜３時間の長時間
を必要とし作業性が悪いこと、更に翌日まで放置すると
吸湿のため強さが低下する等の欠点があることが分った
。However, with a mere combination of these, the exothermic reaction between sodium aluminate and aluminum powder is significantly affected by the components of the sodium aluminate, and not only is sufficient mold strength not obtained, but the strength also varies widely. It was found that after kneading and molding, it took a long time of 2 to 3 hours to obtain sufficient strength, resulting in poor workability.Furthermore, it was found that if left until the next day, the strength decreased due to moisture absorption. .
この欠点を解消するため、更に研究の結果、アルミナ砂
、アルミン酸ナトリウムをＣＯ２ガス雰囲気中で混練し
た後アルミニウム粉末を配合し、該配合物を造型後発熱
により硬化させると、硬化時間が短時間で優れた圧縮強
さが得られること、また、アルミン酸ナトリウムの成分
をＮａ２０／Ａｌ２０３のモル比が１．５〜３．０の範
囲のものとすると、硬化反応が促進され、吸湿性も改善
されることが分った。In order to overcome this drawback, further research revealed that if alumina sand and sodium aluminate are kneaded in a CO2 gas atmosphere, then aluminum powder is added, and the mixture is cured by heat generation after molding, the curing time is shortened. In addition, when the sodium aluminate component has a molar ratio of Na20/Al203 in the range of 1.5 to 3.0, the curing reaction is accelerated and hygroscopicity is also improved. I found out that it will be done.
これらの知見に基いて本発明を完成したものである。The present invention was completed based on these findings.
本発明において使用する骨材のアルミナ砂は、７０〜１
５０メッシュの高純度アルミナが適している。The aggregate alumina sand used in the present invention is 70 to 1
50 mesh high purity alumina is suitable.
アルミン酸ナトリウムはＮａ ２ ０ ／ Ａ ｌ ２
０ ｓのモル比が１．５〜３．０のものが好まし《、
水分量は６０重量％以上のものがよい。Sodium aluminate is Na20/A12
It is preferable that the molar ratio of 0 s is 1.5 to 3.0《,
The moisture content is preferably 60% by weight or more.
アルミン酸ナトリウム組成のうちで
Ｎａ２０／Ａｌ２０３のモル比１の組成のものは、安定
でアルミニウム粉末等の反応は遅いが、そのモル比が１
．５であると、余分のアルカリ分Ｎａ２０を含むため、
アルミニウム粉末と反応してアルミン酸ナトリウムを生
成し発熱し鋳型の硬化を促進する。Among sodium aluminate compositions, those with a molar ratio of Na20/Al203 of 1 are stable and react slowly with aluminum powder, etc.;
．． If it is 5, it contains extra alkaline Na20,
Reacts with aluminum powder to generate sodium aluminate, which generates heat and accelerates mold hardening.
そのためにはそのモル比が１．５以上であることが好ま
しい。For this purpose, it is preferable that the molar ratio is 1.5 or more.
そのモル比が３．０を超えると、水分量が６０重量％以
上でもアルミン酸ナトリウムの水溶液が変質し、保存で
きなくなるので好ましくない。If the molar ratio exceeds 3.0, the quality of the sodium aluminate aqueous solution deteriorates even if the water content is 60% by weight or more, making it unpreferable to store it.
水分が６０重量％より少ないと、硬化反応がし難くなる
のでそれ以上であることがよい。If the moisture content is less than 60% by weight, the curing reaction will be difficult to occur, so it is preferable that the moisture content is more than 60% by weight.
？ルミナ砂、アルミン酸ナトリウム及びアルミニウム粉
末の配合割合は、アルミナ砂１００重量部に対し、アル
ミン酸ナトリウム（水分６０重量％）２〜１０重量部、
アルミニウム粉末０．３〜１重量部であることが好まし
い。? The mixing ratio of lumina sand, sodium aluminate, and aluminum powder is 2 to 10 parts by weight of sodium aluminate (60% by weight of water) to 100 parts by weight of alumina sand;
Preferably, the amount of aluminum powder is 0.3 to 1 part by weight.
アルミン酸ナトリウム及びアルミニウム粉末の配合割合
が前記下限より少ないと十分な鋳型の強度が得難く、上
限より多《なるとコスト的に高くなる。If the mixing ratio of sodium aluminate and aluminum powder is less than the above-mentioned lower limit, it will be difficult to obtain sufficient mold strength, and if it is more than the upper limit, the cost will increase.
これらのものを混練する際最初アルミナ砂とアルミン酸
ナトリウムを大気中で十分混練し、続いてＣＯガスの雰
囲気で行うと、アルミン酸ナトリウムの一部がＣＯ２と
反応し、炭酸ナトリウムと水酸化アルミニウムに分解し
、硬化反応を促進する。When kneading these materials, alumina sand and sodium aluminate are first sufficiently kneaded in the air, and then in a CO gas atmosphere, a part of the sodium aluminate reacts with CO2, resulting in sodium carbonate and aluminum hydroxide. decomposes into and accelerates the curing reaction.
また、生成する炭酸ナトリウムは吸湿性を改善し、翌日
になっても強さは低下しない。Also, the sodium carbonate produced improves hygroscopicity, and the strength does not decrease even the next day.
このアルミン酸ナトリウムの混練中の分解率は６０〜９
０％が適当である。The decomposition rate of this sodium aluminate during kneading is 60-9
0% is appropriate.
本発明によると次のような優れた効果を有する。According to the present invention, the following excellent effects are achieved.
（１）粘結剤の反応生成物がアルミン酸ナトリウムのみ
であるため、アルミナ砂の回収及び水溶液の処理が容易
であり、鋳型材の再利用が簡単になる。(1) Since the reaction product of the binder is only sodium aluminate, it is easy to recover the alumina sand and treat the aqueous solution, and the mold material can be easily reused.
（２）発熱自硬性て圧縮強さの優れた鋳型が容易に得ら
れ、しかも水により型ばらしし得られるため従来の鋳型
におけるような粉塵、騒音、振動等の作業環境の悪い点
がなく、また公害もない。(2) A mold with excellent heat-generating self-hardening and compressive strength can be easily obtained, and since the mold can be disassembled with water, there is no problem with the work environment such as dust, noise, vibration, etc., as with conventional molds. There is also no pollution.
（３）粘結剤がアルミン酸ナトリウムとアルミニウム粉
末で、しかも少量の添加量で強度の高いものが得られる
ため安価な鋳型が得られる。(3) Since the binder is sodium aluminate and aluminum powder, and high strength can be obtained with a small amount of addition, an inexpensive mold can be obtained.
実施例
７０〜１５０メッシュの高純度アルミナ砂１． ０ ０
重量部に、Ｎａ２０／Ａ１２０３のモル比１．７、水分
量６０重量％のアルミン酸ナトリウム３重量部を配合し
、毎分６３回転の攪拌機で両者を大気中で３分混練し、
さらに５ｌ／分のＣＯ２ガスを吹きつけて２分間混練し
た。Example 70-150 mesh high purity alumina sand 1. 0 0
3 parts by weight of sodium aluminate with a molar ratio of Na20/A1203 of 1.7 and a water content of 60% by weight were added to the parts by weight, and both were kneaded in the air for 3 minutes using a stirrer at 63 revolutions per minute.
Furthermore, CO2 gas was blown at 5 l/min and kneading was continued for 2 minutes.
次にアルミニウム粉末を０．５重量部配合して圧縮試験
片を作った。Next, 0.5 parts by weight of aluminum powder was added to prepare a compression test piece.
試験片はＪＩＳ規格に従い、５０朋径Ｘ５０ｍ７Ｍのも
のとした。The test piece was 50mm in diameter x 50m7m in accordance with JIS standards.
他方比較のためＣＯ２ガス雰囲気中で混練しないもので
同様の試験片を作り、両者の圧縮強さの試験を行った。On the other hand, for comparison, similar test pieces were made without being kneaded in a CO2 gas atmosphere, and the compressive strength of both pieces was tested.
その結果は第１図に示す通りであった。The results were as shown in FIG.
図中、１は本発明の方法である大気中で混練した後、続
いてＣＯ２ガス雰囲気中で混練したもので作った鋳型試
験片の場合、２は比較のための、混線を大気中のみで行
ったもので作った鋳型試験片の場合における試験片作製
後の経過時間と圧縮強さとの関係図である。In the figure, 1 is a mold test piece made by the method of the present invention, which was kneaded in the atmosphere and then in a CO2 gas atmosphere, and 2 is a mold test piece made by the method of the present invention, which was kneaded in a CO2 gas atmosphere. FIG. 3 is a relationship diagram between elapsed time after test piece production and compressive strength in the case of mold test pieces made using the same method.
図が示すように、本発明の試験片においては、１時間で
自硬性鋳型として必要な圧縮強さである１５ｋｇ／ｃｍ
２以上に達した。As shown in the figure, the test piece of the present invention achieved a compressive strength of 15 kg/cm in 1 hour, which is the necessary compressive strength for a self-hardening mold.
Reached 2 or more.
また翌日になっても圧縮強さの低下は少なく、大型鋳物
用鋳型として使用し得られるものであった。Further, even on the next day, there was little decrease in compressive strength, and the mold could be used as a mold for large castings.
一方大気中のみで混練した場合は、必要な圧縮強さを得
るのに３時間を必要とし、さらに翌日になると吸湿して
圧縮強さが使用限界以下に低下した。On the other hand, when kneading was carried out only in the atmosphere, it took 3 hours to obtain the necessary compressive strength, and on the next day, moisture was absorbed and the compressive strength decreased below the service limit.
鋳込み実験
６３回転の攪拌機で大気中で混練し、終りにＣＯ２ガス
雰囲気中で２分間混練し、アルミニウム粉末０．５重量
部を添加し造型した。Casting experiment The mixture was kneaded in the air with a stirrer running 63 revolutions, and finally kneaded for 2 minutes in a CO2 gas atmosphere, and 0.5 parts by weight of aluminum powder was added and molded.
この鋳型を使用して、これにＦＣ ２ ０相当の鋳鉄を
鋳込み、鋳物が冷却した後、水圧１ｋｇ／ｃｒｔｔ、水
量１０ｌ／分の条件で水溶させた結果、鋳型は容易に崩
壊した。Using this mold, cast iron equivalent to FC 20 was cast into it, and after the casting had cooled, it was dissolved in water at a water pressure of 1 kg/crtt and a water flow rate of 10 l/min. As a result, the mold easily collapsed.
しかも健全な鋳物が得られた。Moreover, a sound casting was obtained.
第１図は鋳型の試験片の作製後の経過時間と試験片の圧
縮強さとの関係図である。
１はアルミナ砂とアルミン酸ナトリウムの混練を大気中
で行い、続いてＣＯ２ガス雰囲気中で行った場合、２は
該混練を大気中のみで行った場合における曲線。FIG. 1 is a diagram showing the relationship between the elapsed time after the preparation of a mold test piece and the compressive strength of the test piece. 1 is a curve when alumina sand and sodium aluminate are kneaded in the air and then in a CO2 gas atmosphere, and 2 is a curve when the kneading is performed only in the air.
Claims (1)
混錬し、続いてＣＯ２ガス雰囲気中で混錬してアルミン
酸ナトリウムの１部を分解した後、アルミニウム粉末を
配合し、該配合物を造型後発熱により硬化させることを
特徴とする発熱自硬水溶性鋳型の製造法。 ２ アルミン酸ナトリウムがＮａ２０／Ａｌ２０３のモ
ル比が１．５〜３．０であり、水分量が６０重量％以上
である特許請求の範囲第１項記載の発熱自硬水溶性鋳型
の製造法。 ３ アルミン酸ナトリウムの１部の分解が６０〜９０％
の分解率である特許請求の範囲第１項記載の発熱自硬水
溶性鋳型の製造法。 ４ アルミナ砂１００重量部、アルミン酸ナトリウム２
〜１０重量部、及びアルミニウム粉末０．３〜１．０重
量部である特許請求の範囲第１項記載の発熱自硬水溶性
型の製造法。[Claims] 1. Alumina sand and sodium aluminate are sufficiently kneaded in the atmosphere, then kneaded in a CO2 gas atmosphere to decompose a part of the sodium aluminate, and then aluminum powder is blended, A method for producing a heat-generating self-hardening water-soluble mold, characterized in that the compound is cured by heat generation after molding. 2. The method for producing an exothermic self-hardening water-soluble mold according to claim 1, wherein the sodium aluminate has a Na20/Al203 molar ratio of 1.5 to 3.0 and a water content of 60% by weight or more. 3 Partial decomposition of sodium aluminate is 60-90%
A method for producing an exothermic self-hardening water-soluble mold according to claim 1, wherein the decomposition rate is as follows. 4 100 parts by weight of alumina sand, 2 parts by weight of sodium aluminate
10 parts by weight of aluminum powder and 0.3 to 1.0 parts by weight of aluminum powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2670680A JPS588933B2 (en) | 1980-03-05 | 1980-03-05 | Manufacturing method of heat-generating self-hardening water-soluble mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2670680A JPS588933B2 (en) | 1980-03-05 | 1980-03-05 | Manufacturing method of heat-generating self-hardening water-soluble mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56122641A JPS56122641A (en) | 1981-09-26 |
| JPS588933B2 true JPS588933B2 (en) | 1983-02-18 |
Family
ID=12200819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2670680A Expired JPS588933B2 (en) | 1980-03-05 | 1980-03-05 | Manufacturing method of heat-generating self-hardening water-soluble mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS588933B2 (en) |
-
1980
- 1980-03-05 JP JP2670680A patent/JPS588933B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56122641A (en) | 1981-09-26 |
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