JPS61176441A - Metal mold casting method - Google Patents
Metal mold casting methodInfo
- Publication number
- JPS61176441A JPS61176441A JP1610085A JP1610085A JPS61176441A JP S61176441 A JPS61176441 A JP S61176441A JP 1610085 A JP1610085 A JP 1610085A JP 1610085 A JP1610085 A JP 1610085A JP S61176441 A JPS61176441 A JP S61176441A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- molten metal
- carbon
- oxides
- holes
- 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
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/086—Filters
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】
〔産業上の利用分野〕
本発明は、Ｍｎ−Ａｆ系磁石に用いられるＭｎ−Ａｌ系
合金等、空気中の酸素と反応し易い活性金属の組合わせ
からなる合金の溶湯を金型内へ鋳込み、金型鋳造する方
法に関する。Detailed Description of the Invention [Industrial Application Field] The present invention is directed to the use of alloys consisting of a combination of active metals that easily react with oxygen in the air, such as Mn-Al alloys used in Mn-Af magnets. This invention relates to a method of casting molten metal into a mold.
Ｍｎ−Ａｌ系合金（例えば、７０Ｍ ｎ −３０Ａ Ｉ
ｔ ）は、その主成分たるＭｎ、ＡＩが共に空気中の酸
素と反応し易い活性金属であるために、該合金の溶湯を
金型鋳造する場合、該溶湯内にＭｎやＡ１等の酸化物が
極めて巻き込まれ易い。従って、得られる鋳造製品は、
その内部に、前記酸化物を主体とする非金属介在物が含
まれることとなり、またその外表面に、金型表面にごく
薄く凝固した金属層が酸化剥離して巻き込まれたものと
考えられる湯しわが発生するのが一般である。Mn-Al alloy (e.g. 70M n -30A I
t), its main components Mn and Al are both active metals that easily react with oxygen in the air, so when the molten metal of this alloy is cast in a mold, oxides such as Mn and A1 are added to the molten metal. is extremely easy to get caught up in. Therefore, the obtained cast product is
The inside of the mold contains non-metallic inclusions mainly composed of the oxide, and the outer surface of the mold contains hot water, which is thought to have been oxidized and peeled off from a very thin solidified metal layer on the mold surface. It is common for wrinkles to occur.
このように非金属介在物が含まれたり湯しわが発生した
りするのを防止する従来の方法としては、Ａｒガスを用
いて金型内の雰囲気制御を行う方法が考えられる。As a conventional method for preventing the inclusion of non-metallic inclusions and the occurrence of hot water wrinkles, a method of controlling the atmosphere inside the mold using Ar gas can be considered.
然るに、Ａｒガスによる金型内の雰囲気制御を行う場合
、単にＡｒガスを金型内へ送り込むだけでは、金型内の
大気を十分に置換することができない。従って、完全な
Ａｒガス雰囲気を形成するには、そのための特別な装置
が必要となり、設備が複雑化して経済的負担も極めて大
きくなる。However, when controlling the atmosphere inside the mold using Ar gas, simply sending Ar gas into the mold cannot sufficiently replace the atmosphere inside the mold. Therefore, in order to form a complete Ar gas atmosphere, a special device is required, which complicates the equipment and imposes an extremely heavy economic burden.
本発明は、かかる事情に鑑みてなされたものであり、Ｍ
ｎ −Ａ ｌ系合金等の溶湯を金型鋳造する場合にお
いて、非金属介在物が含まれたり湯しわが発生したりし
ていない健全な鋳造製品を得ることができる上、簡易で
経済的負担が少なくて済む方法を提供することを目的と
する。The present invention has been made in view of such circumstances, and is
When mold casting molten metal such as n-Al alloy, it is possible to obtain a sound cast product that does not contain nonmetallic inclusions or wrinkles, and it is simple and economical. The purpose is to provide a method that requires less.
かかる目的を達成すべく創案された本発明の金型鋳造方
法は、炭素繊維のメツシュ又は多数の貫通孔が穿設され
た炭素板等の炭素系フィルターを金型の上面開口部に取
り付け、金型内へ鋳込まれる溶湯をして前記炭素系フィ
ルターを通過せしめることにより、溶湯中の酸化物を炉
去することを特徴としている。The mold casting method of the present invention, which was devised to achieve the above object, involves attaching a carbon-based filter such as a carbon fiber mesh or a carbon plate with a large number of through holes to the upper opening of the mold. The molten metal cast into the mold is passed through the carbon-based filter to remove oxides in the molten metal.
なお、フィルターとして炭素系材料を使用した理由は、
次の通りである。The reason why carbon-based material was used as a filter is as follows.
It is as follows.
（１）熱衝撃によるワレやカケ落ちが極めて少ないこと
（ｉｉ）万一、溶湯中に混入しても溶湯とのぬれ性が低
いので、凝固時に不純物として巻き込まれないこと
〔作用〕
かかる本発明方法を用いてＭｎ−Ａ ｌ系合金等の溶湯
を金型鋳造する場合、該溶湯が炭素系フィルターを通過
する段階において、該溶湯内に巻き込まれているＭｎや
Ａ１等の酸化物が炉去され、該酸化物の金型内への流入
が防止される。(1) There is very little cracking or chipping due to thermal shock. (ii) Even if it gets mixed into the molten metal, it has low wettability with the molten metal, so it will not be dragged in as an impurity during solidification [Function] This invention When molten metal such as Mn-Al alloy is cast in a mold using this method, when the molten metal passes through a carbon-based filter, oxides such as Mn and A1 caught in the molten metal are removed from the furnace. This prevents the oxide from flowing into the mold.
その結果、得られる鋳造製品は、その内部に、前記酸化
物を主体とする非金属介在物が含まれることがなくなり
、またその外表面に、金型表面にごく薄く凝固した金属
層が酸化剥離して巻き込まれたものと考えられる湯しわ
が発生しなくなる。As a result, the resulting cast product does not contain any non-metallic inclusions mainly composed of the above-mentioned oxides, and the metal layer that has solidified very thinly on the mold surface is oxidized and peeled off on its outer surface. Wrinkles that are thought to have been caused by hot water will no longer occur.
次に、本発明方法をその実施例に基づいて具体的に説明
する。Next, the method of the present invention will be specifically explained based on examples thereof.
第１図は、本発明方法の実施に使用する装置を模式的に
示す縦断面図である。FIG. 1 is a longitudinal cross-sectional view schematically showing an apparatus used for carrying out the method of the present invention.
図中、（１）はＭ ｎ −Ａ ｌ系合金等の溶湯が鋳込
まれるべき金型であり、咳金型（１）は上面に開口部（
１ａ）を有するコツプ状の形状を呈している。In the figure, (1) is a mold into which molten metal such as Mn-Al alloy is to be cast, and the cough mold (1) has an opening (
1a).
咳金型（１）の開口部（１ａ）には、孔径が１〜３ｆｉ
の多数の貫通孔（２ａ）・・（２ａ）が穿設された炭素
板（２）が取り付けられ、該開口部（１ａ）は該炭素板
（２）によって全面が覆われている。The opening (1a) of the cough mold (1) has a hole diameter of 1 to 3fi.
A carbon plate (2) in which a large number of through holes (2a) (2a) are bored is attached, and the opening (1a) is entirely covered by the carbon plate (2).
更に、該炭素板（２）の上には押湯リング（３）が載置
され、該押湯リング（３）の上方から前記溶湯が鋳込ま
れるようになっている。Further, a feeder ring (3) is placed on the carbon plate (2), and the molten metal is poured from above the feeder ring (3).
かかる装置を用いてＭ ｎ −Ａ ｌ系合金等の溶湯を
鋳込む場合、該溶湯が炭素板（２）を通過する段階にお
いて、該溶湯内に巻き込まれているＭｎやＡ１等の酸化
物が該炭素板（２）によって炉去され、それが金型（１
）内へ流入するのが防止される。When casting molten metal such as Mn-A1 alloy using such a device, oxides such as Mn and A1 caught in the molten metal are removed when the molten metal passes through the carbon plate (2). The carbon plate (2) is removed by the furnace, and it is heated to the mold (1).
) is prevented from flowing into the interior.
その結果、第１表に示す如く、得られる鋳造製品はその
内部に非金属介在物が含まれることがなくなり、またそ
の外表面に湯しわが発生することがなくなる。As a result, as shown in Table 1, the resulting cast products do not contain non-metallic inclusions, and do not have hot water wrinkles on their outer surfaces.
第 １ 表
但し、第１表中の非金属介在物又は湯じわの発生率は、
金型鋳造された製品個数に対する欠陥発生製品個数の比
率（％）を示している。Table 1 However, the incidence of non-metallic inclusions or hot water wrinkles in Table 1 is as follows:
It shows the ratio (%) of the number of defective products to the number of mold-cast products.
なお、上述の実施例は、金型（１）の開口部（１ａ）に
取り付けられる炭素系フィルターが多数の貫通孔（２ａ
）・・（２ａ）が穿設された炭素板（２）である場合に
ついて説明したが、該炭素板（２）の代わりに炭素繊維
のメツシュ（２ＭＸ×２ｆｌ〜３ ｖｓｓ Ｘ ３ ｔ
ｍのメソシュを単独で用いたもの又はそれを重ね合わせ
たもの）を用いても、得られる鋳造製品中に非金属介在
物や湯しわが発生するのを防止することができる。In addition, in the above-mentioned embodiment, the carbon-based filter attached to the opening (1a) of the mold (1) has a large number of through holes (2a).
) ... (2a) is a perforated carbon plate (2), but instead of the carbon plate (2), a carbon fiber mesh (2MX x 2 fl ~ 3 vss x 3 t) is used.
Even if M meshes are used alone or in a layered manner, it is possible to prevent nonmetallic inclusions and hot water wrinkles from occurring in the resulting cast product.
以上詳述したように、本発明方法を用いる場合は、炭素
系フィルターを金型の上面開口部に取り付け、溶湯に該
炭素系フィルターを通過させるという簡単な方法にて、
金型内へのＭｎやＡＮ等の酸化物の流入を防止すること
ができ、その結果、非金属介在物や湯じわ等のない健全
な鋳造製品を得ることができる。As detailed above, when using the method of the present invention, a carbon-based filter is attached to the upper opening of the mold and the molten metal is passed through the carbon-based filter.
It is possible to prevent oxides such as Mn and AN from flowing into the mold, and as a result, it is possible to obtain a healthy cast product free of nonmetallic inclusions and wrinkles.
第１図は本発明方法の実施に使用する装置を示す縦断面
図である。
１：金型、１ａ：開口部、２：炭素系フィルター、２ａ
：貫通孔。FIG. 1 is a longitudinal sectional view showing an apparatus used to carry out the method of the present invention. 1: Mold, 1a: Opening, 2: Carbon filter, 2a
:Through hole.
Claims (1)
た炭素板等の炭素系フィルターを金型の上面開口部に取
り付け、金型内へ鋳込ませる溶湯をして前記炭素系フィ
ルターを通過せしめることにより、溶湯中の酸化物を炉
去することを特徴とする金型鋳造方法。(1) Attach a carbon filter such as a carbon fiber mesh or a carbon plate with many through holes to the upper opening of the mold, and pour the molten metal into the mold to remove the carbon filter. A mold casting method characterized by removing oxides in the molten metal through a furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1610085A JPS61176441A (en) | 1985-01-29 | 1985-01-29 | Metal mold casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1610085A JPS61176441A (en) | 1985-01-29 | 1985-01-29 | Metal mold casting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61176441A true JPS61176441A (en) | 1986-08-08 |
Family
ID=11907095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1610085A Pending JPS61176441A (en) | 1985-01-29 | 1985-01-29 | Metal mold casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61176441A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4832105A (en) * | 1988-01-13 | 1989-05-23 | The Interlake Corporation | Investment casting method and apparatus, and cast article produced thereby |
| CN103157766A (en) * | 2011-12-08 | 2013-06-19 | 洛阳奇润电力科技有限公司 | High temperature resistance fiber filtration screen application method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4856521A (en) * | 1971-11-22 | 1973-08-08 | ||
| JPS4873328A (en) * | 1971-12-27 | 1973-10-03 |
-
1985
- 1985-01-29 JP JP1610085A patent/JPS61176441A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4856521A (en) * | 1971-11-22 | 1973-08-08 | ||
| JPS4873328A (en) * | 1971-12-27 | 1973-10-03 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4832105A (en) * | 1988-01-13 | 1989-05-23 | The Interlake Corporation | Investment casting method and apparatus, and cast article produced thereby |
| CN103157766A (en) * | 2011-12-08 | 2013-06-19 | 洛阳奇润电力科技有限公司 | High temperature resistance fiber filtration screen application method |
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