JPS58128248A - Separation of old waste in old sand - Google Patents
Separation of old waste in old sandInfo
- Publication number
- JPS58128248A JPS58128248A JP1084482A JP1084482A JPS58128248A JP S58128248 A JPS58128248 A JP S58128248A JP 1084482 A JP1084482 A JP 1084482A JP 1084482 A JP1084482 A JP 1084482A JP S58128248 A JPS58128248 A JP S58128248A
- Authority
- JP
- Japan
- Prior art keywords
- sand
- old
- casting
- waste
- magnetic force
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/06—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sieving or magnetic separating
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、特に粘土、ベントナイト等の無機質粘結剤を
主体とする鋳物砂を金属鋳造の鋳型に使用し、鋳造が終
った後に鋳型から排出された砂（以下古砂と甘う）の中
に、鋳造時の高熱により発生し含有されているところの
、形が不定形で、独立して固形を保持している所謂老廃
物を、この古砂を再使用するための前処理として分離除
去することを目的とする古砂中老廃物の分離方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention uses foundry sand mainly composed of an inorganic binder such as clay or bentonite in a metal casting mold, and uses sand discharged from the mold after casting (hereinafter referred to as "old sand"). This old sand is used to reuse the so-called waste products that are amorphous and hold their own solid state, which are generated and contained in the high heat during casting (sand). The present invention relates to a method for separating waste products from old sand, which is intended to be separated and removed as a pre-treatment for sand processing.
一般に、金属鋳造の鋳型に使用する鋳物砂は経済的見地
等より繰返して使用される。この場合砂は造型、注湯後
、バラク、粉砕、ふるい分けを行い、若干の粘結剤、水
等を加えて再使用に供されているのが現状である。Generally, foundry sand used in metal casting molds is used repeatedly from an economic standpoint. In this case, the current situation is that the sand is shaped, poured, bulked, crushed, and sieved, and then reused after adding a small amount of binder, water, etc.
ところで、注湯の際高温の溶湯に接した部分の砂は、脱
水、変態等による劣化を起し、粘結剤は粘結力を失い、
団粒化したり微粉化してゆく１、そして、このサイクル
が繰返し行われるにしたがい、これら老廃物はだんだん
増加するため、全体としての砂の純度が低下するので、
多量の新砂を補給する必要が生じてくる。一方、これら
の老廃物は水洗、焙焼や機械的衝撃、摩擦によシ多少は
除去されるけれど本効率が非常に悪く、相当量が不定形
で、独立して固形を保持する団粒化して砂中に残留して
いる。By the way, the sand in the area that comes into contact with the high-temperature molten metal during pouring deteriorates due to dehydration, transformation, etc., and the binder loses its cohesive power.
As this cycle is repeated, these waste products gradually increase and the purity of the sand as a whole decreases.
It becomes necessary to supply a large amount of new sand. On the other hand, although these waste products can be removed to some extent by water washing, roasting, mechanical impact, and friction, the efficiency is very low, and a considerable amount is amorphous and aggregates that retain solidity independently. remains in the sand.
砂の主成分である純珪砂の融点は１７５０℃であるか、
前記の老廃物の融点は凡そ１２００℃前後であるため、
老廃物の増加はこれを含む古砂の再使用に際し、最悪の
場合には溶融と焼き着き現象を引起すことがある。これ
は、注湯温度が１５００〜１６００℃にもなるので型と
溶湯との接触面に存在する耐火度の低い部分の溶込みに
より引起されるものであシ、その結果鋳物の肌は荒れる
。The melting point of pure silica sand, which is the main component of sand, is 1750°C.
Since the melting point of the waste mentioned above is approximately 1200°C,
In the worst case, the increase in waste products may cause melting and seizure phenomena when used sand containing waste products is reused. This is caused by the infiltration of the low refractory portion existing at the contact surface between the mold and the molten metal, since the pouring temperature is as high as 1,500 to 1,600°C, and as a result, the surface of the casting becomes rough.
本発明は、以上のような砂の品質に悪影響を及ぼす有害
不純物を除去すべく鋭意研究に努力し、次のような方法
を開発し、完成するに至ったものである。The present invention is the result of extensive research efforts to remove harmful impurities that adversely affect the quality of sand as described above, and the following method has been developed and completed.
本発明の原理は、粘結剤として粘土、ベントナイト等の
無機質物質を含有する鋳物用古砂中の劣化した砂および
団粒化した粘結剤等の老廃物を、該老廃物中の誘磁物質
を利用して強磁力により磁選分離し、全体としての砂の
純度を上昇させることである。The principle of the present invention is to remove waste materials such as deteriorated sand and agglomerated binder from old foundry sand that contains inorganic substances such as clay and bentonite as a binder. The purpose is to increase the purity of the sand as a whole by performing magnetic separation using a strong magnetic force.
即ち、本発明の要旨とするところは、金属鋳造の際鋳型
に使用され排出された古砂中に遊離する老廃物を、５，
０００〜２５，０００ガウスの範囲の磁力により分離除
去することを特徴とする古砂中老廃物の分離方法である
。That is, the gist of the present invention is to reduce waste products released in old sand used in molds and discharged during metal casting by reducing
This is a method for separating waste products from old sand, which is characterized by separating and removing waste products using a magnetic force in the range of 000 to 25,000 Gauss.
次の第１表はかかる古砂中に存在する老廃物の性質を示
し、第２表は本発明の方法によって老廃物を分離除去し
た砂（磁力が５． ＯＯＯガウスのもの、および２５，
０００ガウスのもの〕と従来の再使用砂（使用前）の性
質を比較して示している。The following Table 1 shows the properties of wastes present in such old sand, and Table 2 shows the properties of wastes present in the old sand, and Table 2 shows sands with a magnetic force of 5.00 Gauss, and 25,
000 Gauss] and conventional reused sand (before use).
本発明において老廃物分離に用いる磁力の下限を５．０
００ガウスとしたのは、第１表に示すように老廃物には
鉄分が若干多く含まれており、比重が小さいことから、
静止状態においては２．０００ガウス程度の磁力に感知
し分離可能であるが、実際の製造工程のような動的な状
態では４，０００ガウス以下では殆んど感知せず、分離
可能なのは５．０００ガウス以上であることによる。ま
た、磁力の上限を２５，０００ガウスとしたのは、これ
を超えて強磁力にすると老廃物はかりでなく、使用可能
な硼砂まで磁着される割合が多くなるので経済的でない
からである。In the present invention, the lower limit of the magnetic force used for waste separation is 5.0.
The reason for choosing 00 Gauss is that as shown in Table 1, waste products contain slightly more iron and have a lower specific gravity.
In a static state, it is possible to sense and separate a magnetic force of about 2,000 gauss, but in a dynamic state such as in an actual manufacturing process, it is hardly detected at a magnetic force of 4,000 gauss or less, and only 5.0 gauss can be separated. 000 Gauss or more. Further, the upper limit of the magnetic force is set to 25,000 Gauss because it is not economical to make the magnetic force stronger than this because a large proportion of usable borax is magnetized instead of the waste product scale.
なお、この磁力分離に用いる装置は通常の高磁力磁選機
を利用することができるので、特別な装置は必要としな
い。Note that a normal high magnetic force magnetic separator can be used as the device used for this magnetic separation, so no special device is required.
第２表に示した従来例、本発明の実施例共、古砂を鉄片
除去後粉砕して単一粒子にした後の砂を比較したもので
あって、本発明の方法により単に老廃物を分離除去する
だけで再生砂中の硼砂の含有量が多くなり、鋳造欠陥の
発生が減少する。よって、産業上貢献するところが多大
である。Both the conventional example and the example of the present invention shown in Table 2 compare old sand after removing iron pieces and pulverizing it into single particles.The method of the present invention simply removes waste products. Simply by separating and removing it, the content of borax in the reclaimed sand increases, reducing the occurrence of casting defects. Therefore, it has a lot to contribute to industry.
代理人 弁理士 佐 藤 正 年 同 同 木村三朗 同 同 佐々木 宗 治 （５） ２６Agent: Patent Attorney Tadashi Sato Same Same Same as Saburo Kimura Same Same as Souji Sasaki (5) 26
Claims (1)
る老廃物を、５，０００〜２５，０００ガウスの範囲の
磁力により分離除去することを特徴とする古砂中老廃物
の分離方法。A method for separating wastes from old sand, which is characterized by separating and removing wastes liberated in old sand used in molds and discharged during metal casting using a magnetic force in the range of 5,000 to 25,000 Gauss. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1084482A JPS58128248A (en) | 1982-01-28 | 1982-01-28 | Separation of old waste in old sand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1084482A JPS58128248A (en) | 1982-01-28 | 1982-01-28 | Separation of old waste in old sand |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58128248A true JPS58128248A (en) | 1983-07-30 |
Family
ID=11761654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1084482A Pending JPS58128248A (en) | 1982-01-28 | 1982-01-28 | Separation of old waste in old sand |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58128248A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6039143U (en) * | 1983-08-18 | 1985-03-18 | オンキヨー株式会社 | Key input signal processing circuit |
| WO2017064905A1 (en) * | 2015-10-15 | 2017-04-20 | 新東工業株式会社 | Molding sand regeneration method and regenerating system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5144746A (en) * | 1974-06-26 | 1976-04-16 | Schneider Daniel J | |
| JPS52115727A (en) * | 1976-03-25 | 1977-09-28 | Kawaguchi Tetsukou Kk | Molding sand reproduction process |
| JPS554510A (en) * | 1978-06-26 | 1980-01-14 | Tokyo Shibaura Electric Co | Nuclear fuel assembly for boiling water reactor |
| JPS55165249A (en) * | 1979-06-07 | 1980-12-23 | Toyota Motor Corp | Production of silica sand for casting |
-
1982
- 1982-01-28 JP JP1084482A patent/JPS58128248A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5144746A (en) * | 1974-06-26 | 1976-04-16 | Schneider Daniel J | |
| JPS52115727A (en) * | 1976-03-25 | 1977-09-28 | Kawaguchi Tetsukou Kk | Molding sand reproduction process |
| JPS554510A (en) * | 1978-06-26 | 1980-01-14 | Tokyo Shibaura Electric Co | Nuclear fuel assembly for boiling water reactor |
| JPS55165249A (en) * | 1979-06-07 | 1980-12-23 | Toyota Motor Corp | Production of silica sand for casting |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6039143U (en) * | 1983-08-18 | 1985-03-18 | オンキヨー株式会社 | Key input signal processing circuit |
| WO2017064905A1 (en) * | 2015-10-15 | 2017-04-20 | 新東工業株式会社 | Molding sand regeneration method and regenerating system |
| JP2017074604A (en) * | 2015-10-15 | 2017-04-20 | 新東工業株式会社 | Method for regeneration of casting mold sand and regeneration system |
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