JPS6211939B2 - - Google Patents
Info
- Publication number
- JPS6211939B2 JPS6211939B2 JP56097820A JP9782081A JPS6211939B2 JP S6211939 B2 JPS6211939 B2 JP S6211939B2 JP 56097820 A JP56097820 A JP 56097820A JP 9782081 A JP9782081 A JP 9782081A JP S6211939 B2 JPS6211939 B2 JP S6211939B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- substance
- sand
- binder
- electrolyte
- 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
- 239000000126 substance Substances 0.000 claims description 16
- 239000004576 sand Substances 0.000 claims description 13
- 239000011230 binding agent Substances 0.000 claims description 10
- 239000003792 electrolyte Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 238000004898 kneading Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 20
- 239000000463 material Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 7
- 239000004020 conductor Substances 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002001 electrolyte material Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
【発明の詳細な説明】
この発明は鋳型の製造方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a mold.
鋳型の製法としては、有機または無機の粘結剤
を用いる種々の方法が実用化されており、いずれ
も一長一短をもつているが、なかでは有機自硬性
鋳型がそのすぐれた特性のため最近とくに賞用さ
れるようになつた。しかしながら、この有機自硬
性鋳型には、混練時における臭気の発生、注湯時
におけるSOX、COガスの発生および解枠時にお
ける粉塵の発生など公害防止上および労働衛生上
の種々の問題があり、必ずしも充分満足できるも
のではない。上記有害ガスや粉塵の発生量が現在
のところ法的環境基準の許容限度内にあつたとし
ても、将来法的環境基準が一段ときびしくなるこ
とが予想されるので、より環境汚染の少ない鋳型
製造法に対する要望が強かつた。 Various methods of making molds using organic or inorganic binders have been put into practical use, all of which have advantages and disadvantages, but among them, organic self-hardening molds have recently received particular awards due to their excellent properties. came to be used. However, this organic self-hardening mold has various problems in terms of pollution prevention and occupational health, such as the generation of odor during kneading, the generation of SOx and CO gas during pouring, and the generation of dust during frame breaking. , is not necessarily completely satisfactory. Even if the amount of harmful gases and dust generated above is currently within the permissible limits of legal environmental standards, it is expected that legal environmental standards will become even stricter in the future. There was a strong demand for
この発明は上記のような事情に鑑みなされたも
ので、環境汚染少なく、しかも上記有機自硬性鋳
型に較べて遜色のない鋳型が得られるような鋳型
の製法を提供するものである。すなわち、この発
明にかかる鋳型の製法は、鋳物砂に普通鋳型用結
合剤、無機電解質物質の水溶液および金属粉末を
添加し混練してなる混練物を型枠内に充填し、こ
れに通電して硬化させ鋳型を得ることを特徴とし
ている。以下、これについて詳細に説明する。 The present invention was made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a method for manufacturing a mold which causes less environmental pollution and which is comparable to the organic self-hardening mold described above. That is, the method for manufacturing a mold according to the present invention is to fill a mold with a kneaded product obtained by adding and kneading a common mold binder, an aqueous solution of an inorganic electrolyte substance, and metal powder to foundry sand, and then energizing the mixture. It is characterized by curing to obtain a mold. This will be explained in detail below.
骨材である鋳物砂としては通常広く使用されて
いるけい砂が用いられる。これに添加される結合
剤としては、従来普通鋳型用粘結剤、添加剤とし
て使用されている種々の結合剤例えばベントナイ
ト、木節粘土、でん粉、CMC（カルボキシメチ
ルセルローズ）、ヘキサメタリン酸などが単独で
または２種以上を混合して用いられる。結合剤の
量は、主材料であるけい砂を結合させるに足る量
で充分である。この発明では、上記結合剤のほか
に電解質物質および電気良導体物質を用いる。こ
れらの物質は、けい砂を主材料とする混練物に導
電性を付与し、通電を可能にするために添加され
るものであり、この通電時に発生するジユール熱
により混練物が硬化するのである。電解質物質と
しては、塩化ナトリウム、塩化カリウム、塩化カ
ルシウム、水酸化カルシウム等の無機電解質物質
を用いることができる。この電解質物質は、水な
どに溶解して添加するのが効果的である。また、
電気良導体物質は導電性を向上させるために添加
される金属粉末で、このような物質としては、例
えばアルミニウム、鉄、酸化鉄（）、銅、亜鉛
等の粉末を使用することができる。上記電解質物
質および電気良導体物質は、混練物の加熱に必要
な通電効果をもたらすように、それぞれの物質の
電気的性質に応じて必要量を使用すればよい。な
お、上記諸材料はいずれも安価で容易に入手でき
るものであるが、これらの他に例えば得られる鋳
型の性能を向上させる目的などで、必要に応じて
他の添加材を加えることができる。 Silica sand, which is widely used, is usually used as the foundry sand that is the aggregate. The binders added to this include various binders conventionally used as binders for molds and additives, such as bentonite, Kibushi clay, starch, CMC (carboxymethyl cellulose), hexametaphosphoric acid, etc. It can be used alone or in combination of two or more. The amount of binder is sufficient to bind the silica sand, which is the main material. In this invention, in addition to the binder described above, an electrolyte substance and a good electrical conductor substance are used. These substances are added to impart electrical conductivity to the kneaded material, which is mainly composed of silica sand, and enable electricity to be passed through it, and the kneaded material is hardened by the Joule heat generated when this current is applied. . As the electrolyte substance, inorganic electrolyte substances such as sodium chloride, potassium chloride, calcium chloride, calcium hydroxide, etc. can be used. It is effective to add this electrolyte substance by dissolving it in water or the like. Also,
The electrically conductive substance is a metal powder added to improve conductivity, and examples of such a substance include powders of aluminum, iron, iron oxide, copper, and zinc. The above-mentioned electrolyte substance and good electrical conductor substance may be used in necessary amounts according to the electrical properties of each substance so as to bring about the energizing effect necessary for heating the kneaded material. Note that all of the above-mentioned materials are inexpensive and easily available, but other additives may be added as necessary, for example, for the purpose of improving the performance of the resulting mold.
つぎに、上記鋳物砂、結合剤、電解質物質およ
び電気良導体物質に水などを加えて充分混練す
る。この場合、先ず電解質物質を溶解して電解質
溶液とし、この溶液中で鋳物砂を処理して湿態化
し、得られた湿態砂に結合剤や電気良導体物質を
加えて混練するのが効果的である。このようにし
て得られた混練物を型枠内の所定の個所（型枠と
模型との間隙部）に充填したのち、該型枠内に充
填された混練物に通電する。これにより混練物の
加熱脱水と硬化とが行なわれる。この通電時にお
ける電圧と電流密度とを高くすれば、一般にその
分だけ鋳型の強度発現が速くなるが、これらの条
件は実用的に最も好ましい範囲のものとすればよ
い。混練物が硬化したら、模型を取り外して目的
とする鋳型を得る。 Next, water and the like are added to the foundry sand, binder, electrolyte material and electrically conductive material and thoroughly kneaded. In this case, it is effective to first dissolve the electrolyte substance to obtain an electrolyte solution, treat the foundry sand in this solution to make it wet, add a binder and a good electrical conductor substance to the obtained wet sand, and knead it. It is. After the kneaded material thus obtained is filled in a predetermined location within the mold (the gap between the mold and the model), electricity is applied to the kneaded material filled in the mold. As a result, the kneaded material is heated and dehydrated and hardened. If the voltage and current density at the time of energization are increased, the strength of the mold will generally be developed faster, but these conditions may be set within the most practically preferable range. Once the kneaded material has hardened, the model is removed to obtain the desired mold.
本発明では、鋳型の硬化が単にこれに通電する
ことにより行なわれるので、例えば加熱保温状態
にある糊コーテイング砂を造型後真空ポンプで吸
引流気乾燥させるホツトアンドバキユームプロセ
スと呼ばれる方法などに較べて、はるかに容易に
所期の鋳型を得ることができるとともに、乾燥の
ための大がかりな設備を必要としないので実用上
きわめて有利である。また、本発明では上記のよ
うな物質を使用するので、鋳型の製造時や注湯時
に大量の有害ガスなどが発生するおそれがない。
本発明により得られる鋳型は、水中に浸漬して崩
壊させることができるので、解枠時における粉塵
の発生を防止することができるという利点もあ
る。 In the present invention, the mold is hardened by simply applying electricity to the mold, which is compared to, for example, a method called the hot-and-vacuum process, in which glue coating sand that has been heated and kept warm is dried with suction flow using a vacuum pump after molding. Therefore, the desired mold can be obtained much more easily, and large-scale equipment for drying is not required, which is extremely advantageous in practice. Furthermore, since the above-mentioned substances are used in the present invention, there is no fear that a large amount of harmful gas will be generated during mold manufacturing or pouring.
Since the mold obtained by the present invention can be immersed in water and disintegrated, it also has the advantage of being able to prevent the generation of dust when the mold is dismantled.
つぎに、本発明の実施例について説明する。 Next, examples of the present invention will be described.
実施例
塩化ナトリウムの５％水溶液にけい砂を浸漬し
て湿態砂とし、この湿態砂100重量部にでん粉１
〜10重量部、ヘキサメタリン酸１〜10重量部およ
び電気良導体物質として320メツシユのアルミニ
ウム粉１〜20重量部を加えて充分混練した。得ら
れた混練物を型枠内に流し込み、0.2〜10A、0.1
〜100Vの条件で通電した。このときの通電条件
と鋳型の強度発現の関係を第１図に示す。同図に
おいて通電条件は、3.5A−100V（曲線Ａ）、3.5A
−50V（曲線Ｂ）、0.5A−50V（曲線Ｃ）の３種
が選ばれている。また、鋳型の強度は直径50mm高
さ50mmの円柱状試片の抗圧力（Kg／cm2）であらわ
され、第１図の横軸には通電時間（分）がとられ
ている。同図からわかる通り、鋳型は４〜20分の
通電によつて、抗圧力がほぼ30Kg／cm2となり、鋳
型としての具備条件を充分満足するようになる。Example: Silica sand is immersed in a 5% aqueous solution of sodium chloride to obtain wet sand, and 1 part by weight of starch is added to 100 parts by weight of this wet sand.
~10 parts by weight, 1 to 10 parts by weight of hexametaphosphoric acid, and 1 to 20 parts by weight of 320 mesh aluminum powder as a good electrical conductor were added and thoroughly kneaded. Pour the obtained kneaded material into the mold and apply 0.2 to 10A, 0.1
Power was applied under the condition of ~100V. The relationship between the current application conditions and the strength development of the mold at this time is shown in FIG. In the same figure, the current conditions are 3.5A-100V (curve A), 3.5A
Three types are selected: -50V (curve B) and 0.5A-50V (curve C). The strength of the mold is expressed by the resistance pressure (Kg/cm 2 ) of a cylindrical specimen with a diameter of 50 mm and a height of 50 mm, and the horizontal axis in FIG. 1 shows the current application time (minutes). As can be seen from the figure, by energizing the mold for 4 to 20 minutes, the resistive pressure becomes approximately 30 kg/cm 2 , which fully satisfies the requirements for a mold.
以上に説明したように、この発明にかかる鋳型
の製法は、入手性に富んだ材料を用いて環境を汚
染することなく、従来の有機自硬性鋳型に匹敵す
るような鋳型を容易に製造することのできるきわ
めてすぐれたものである。 As explained above, the method for manufacturing a mold according to the present invention makes it possible to easily manufacture a mold comparable to conventional organic self-hardening molds without polluting the environment using readily available materials. This is an extremely excellent product that can be used for a variety of purposes.
第１図は通電条件と鋳型の強度発現の関係をあ
らわすグラフである。
FIG. 1 is a graph showing the relationship between energization conditions and mold strength development.
Claims (1)
の水溶液および金属粉末を添加し混練してなる混
練物を型枠内に充填し、これに通電して硬化させ
鋳型を得ることを特徴とする鋳型の製法。1. A kneaded product obtained by adding and kneading a common mold binder, an aqueous solution of an inorganic electrolyte substance, and a metal powder to foundry sand is filled into a mold, and the mold is hardened by applying electricity to the mold to obtain a mold. Mold manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9782081A JPS58350A (en) | 1981-06-23 | 1981-06-23 | Production of mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9782081A JPS58350A (en) | 1981-06-23 | 1981-06-23 | Production of mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58350A JPS58350A (en) | 1983-01-05 |
| JPS6211939B2 true JPS6211939B2 (en) | 1987-03-16 |
Family
ID=14202369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9782081A Granted JPS58350A (en) | 1981-06-23 | 1981-06-23 | Production of mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58350A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017217096B3 (en) * | 2016-12-06 | 2018-03-22 | Wolfram Bach | Tool insert, forming or core tool and method for making molds or cores |
-
1981
- 1981-06-23 JP JP9782081A patent/JPS58350A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58350A (en) | 1983-01-05 |
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