JPS6154506B2 - - Google Patents
Info
- Publication number
- JPS6154506B2 JPS6154506B2 JP4733584A JP4733584A JPS6154506B2 JP S6154506 B2 JPS6154506 B2 JP S6154506B2 JP 4733584 A JP4733584 A JP 4733584A JP 4733584 A JP4733584 A JP 4733584A JP S6154506 B2 JPS6154506 B2 JP S6154506B2
- Authority
- JP
- Japan
- Prior art keywords
- strainer
- casting
- molten metal
- temperature
- electrode terminal
- 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
- 238000005266 casting Methods 0.000 claims description 40
- 229910052751 metal Inorganic materials 0.000 claims description 35
- 239000002184 metal Substances 0.000 claims description 35
- 238000010438 heat treatment Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 7
- 230000005855 radiation Effects 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 229910001208 Crucible steel Inorganic materials 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 230000020169 heat generation Effects 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 5
- 230000005611 electricity Effects 0.000 description 5
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 5
- 239000011651 chromium Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000009750 centrifugal casting Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000005495 investment casting Methods 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 1
- NFYLSJDPENHSBT-UHFFFAOYSA-N chromium(3+);lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Cr+3].[La+3] NFYLSJDPENHSBT-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910003470 tongbaite Inorganic materials 0.000 description 1
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)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、金属溶湯の鋳造において金属溶湯中
に混在する非金属介在物を去し、製品部内への
流入を防止するための鋳造用ストレーナに関す
る。[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a casting strainer for removing non-metal inclusions mixed in the molten metal during casting of the molten metal and preventing them from flowing into the product section. Regarding.
鋳型内に鋳込まれる金属溶湯には、アカ、スカ
ム、あるいは耐火物片等の非金属介在物が付随す
るのが常である。また、溶解・精錬炉からの出湯
時に取鍋内に流入したスラグ、あるいは取鍋内の
溶湯の保温等を目的として投入された添加物に由
来するスラグなども溶湯とともに鋳型内に流入し
易いものである。
Molten metal poured into a mold is usually accompanied by nonmetallic inclusions such as dirt, scum, and pieces of refractory material. In addition, slag that flows into the ladle when the metal is discharged from the melting/smelting furnace, or slag that originates from additives added to keep the molten metal in the ladle warm, etc., can easily flow into the mold together with the molten metal. It is.
これらの非金属介在物が鋳型内の製品部に流入
すると、得られる鋳形製品の健全性が損なわれる
ことは言うまでもなく、機械的性質を低下させ、
致命的欠陥となり不良品として廃棄処分を余儀な
くされることも少くない。 When these non-metallic inclusions flow into the product part in the mold, it goes without saying that the integrity of the resulting molded product is impaired, and it also deteriorates the mechanical properties.
In many cases, the product becomes fatally defective and has to be disposed of as a defective product.
かかる非金属介在物の混入防止策として、これ
までにも、鋳造方案について種々の工夫がこころ
みられ、例えば鋳込み経路内にアカ取り用湯口、
あるいはアカ取り用めくら押湯を設ける等の措置
が講ぜられてきた。近時は、耐火物製ストレーナ
を湯口や湯道の途中に設置しておき、これを通過
する溶湯中の非金属介在物を取して製品部への
流入を防止する方法が実施されている。そのよう
なストレーナとして、格子状あるいは発泡状に形
成された多数の小孔を有するアルミナ系、シヤモ
ツト系、シリカ系セラミツクの焼成品が使用され
ている。 As a measure to prevent such non-metallic inclusions from entering the casting system, various measures have been taken to date for casting methods, such as installing a sprue for removing scale in the casting path,
Alternatively, measures have been taken, such as installing a blind feeder for removing dirt. Recently, a method has been implemented in which a refractory strainer is installed in the middle of the sprue or runner to remove non-metallic inclusions from the molten metal passing through the strainer and prevent them from flowing into the product section. . As such a strainer, a fired product of alumina-based, Shamotsu-based, or silica-based ceramic is used, which has a large number of small holes formed in a lattice shape or a foamed shape.
しかし、ストレーナを溶湯流路に設置して鋳込
みを行うと、これを通過する溶湯がストレーナに
熱を奪われ、ストレーナ部で凝固する。融点の低
い非鉄金属などの鋳造では、このことはそれ程問
題とはならないが、鋳鋼などのように融点が高
く、凝固時にスキンフオームを形成し易い材質の
場合には、溶湯の降温・粘稠化により目詰りが生
じ、鋳造途中で、鋳込み不能となつてしまう。こ
の目詰りは、ストレーナを溶湯流路内に設置した
状態で、鋳込み開始直前に十分な高温度（例え
ば、500℃以上）に加熱しておくことにより防止
することができるが、砂型や金型などを使用する
一般の鋳造において、溶湯流路内に設置されたス
トレーナを外部から加熱しようとしても、設置場
所によつては加熱が不可能であつたり、また熱効
率が悪いため、所要の高温度に加熱昇温するには
多大のコストを要する。そればかりか、ストレー
ナが所要の高温度に到達する前に、鋳型自体に熱
影響による不都合が生じる。例えば、金型鋳型で
は表面スケールが発生し、有機鋳型では崩壊して
しまうため、実際上目詰りを防止し得る程の高温
度に加熱することは不可能である。 However, when casting is performed with a strainer installed in the molten metal flow path, the molten metal passing through the strainer absorbs heat and solidifies in the strainer section. This is not so much of a problem when casting nonferrous metals with low melting points, but in the case of materials such as cast steel, which have high melting points and easily form skin forms during solidification, the temperature of the molten metal decreases and becomes viscous. This causes clogging, making it impossible to cast during casting. This clogging can be prevented by heating the strainer installed in the molten metal flow path to a sufficiently high temperature (e.g., 500°C or higher) just before starting casting, but In general casting, where a strainer installed in the molten metal flow path is heated from the outside, heating may not be possible depending on the installation location, or the thermal efficiency is poor, so the required high temperature cannot be achieved. It takes a lot of cost to heat and raise the temperature. Moreover, the mold itself suffers from thermal effects before the strainer reaches the required high temperature. For example, metal molds develop surface scale, and organic molds disintegrate, so it is practically impossible to heat them to a temperature high enough to prevent clogging.
このような事情から、ストレーナを使用できる
鋳造は、セラミツクシエル鋳型等を用いた精密鋳
造のように鋳型を800〜1000℃の高温度に加熱し
た状態で鋳込みを行う特殊な鋳造方式に限られて
おり、一般にはストレーナを用いた鋳造は実用さ
れていない。 Due to these circumstances, casting that can use strainers is limited to special casting methods such as precision casting using ceramic shell molds, in which casting is performed with the mold heated to a high temperature of 800 to 1000 degrees Celsius. Therefore, casting using a strainer is not generally put into practice.
本発明の目的は、鋳型の材質や鋳造方案の如何
にかかわらず、目詰りを生じない十分な高温度に
加熱昇温し得るストレーナを提供する。
An object of the present invention is to provide a strainer that can be heated to a sufficiently high temperature without clogging, regardless of the material of the mold or the casting method.
本発明のストレーナは、電極端子を備えた、導
電性耐火物からなり、通電によりそれ自身抵抗発
熱体としての発熱昇温するものである。
The strainer of the present invention is made of a conductive refractory material equipped with electrode terminals, and when energized, it generates heat and raises its temperature as a resistance heating element.
本発明のストレーナを構成する導電性耐火物材
料の例として、炭化珪素（SiC）、ランタンクロ
マイト（LaCr2O3）など、あるいはCr3C2、
Cr7C2、Cr4Cなどの炭化クロムが挙げられる。 Examples of the conductive refractory material constituting the strainer of the present invention include silicon carbide (SiC), lanthanum chromite (LaCr 2 O 3 ), or Cr 3 C 2 ,
Examples include chromium carbide such as Cr 7 C 2 and Cr 4 C.
第１図に本発明ストレーナの例を示す。２は網
目部、３は電極端子である。網目部２は、溶湯流
通面であり、格子により方眼状に多数の小孔が表
裏両面に開口するように形成されている。むろ
ん、網目部２は格子状に限られず、例えば発泡状
に多数の小孔がランダムに形成されたものであつ
てもよい。小孔の断面積は例えば１〜100mm2程度
であつてよい。電極端子３は、網目部２の外縁の
一部を突出させた突起部３１とその突起部に被着
されたアルミニウムあるいは銅などの金属板３２
とで構成されている。該電極端子を形成する突起
部３１は肉厚を厚くして断面積の網目部２のそれ
より大きくし抵抗発熱量を小さくするとよい。発
熱昇温を必要とするのは、網目部２のみであり、
電極端子３部分の加熱の必要はなく、その部分の
発熱昇温は熱エネルギーの無駄となるからであ
る。 FIG. 1 shows an example of the strainer of the present invention. 2 is a mesh portion, and 3 is an electrode terminal. The mesh portion 2 is a molten metal flow surface, and is formed by a grid so that a large number of small holes are opened in a grid pattern on both the front and back sides. Of course, the mesh portion 2 is not limited to a lattice shape, and may be, for example, a foam shape in which a large number of small holes are randomly formed. The cross-sectional area of the small hole may be, for example, about 1 to 100 mm2 . The electrode terminal 3 includes a protrusion 31 that is a part of the outer edge of the mesh portion 2 and a metal plate 32 made of aluminum or copper attached to the protrusion.
It is made up of. It is preferable that the protrusion 31 forming the electrode terminal has a thick wall so that its cross-sectional area is larger than that of the mesh part 2 to reduce the amount of heat generated by resistance. Only the mesh portion 2 requires heating.
This is because there is no need to heat the electrode terminal 3 portion, and raising the temperature of that portion due to heat generation would be a waste of thermal energy.
なお、ストレーナの網目部２の網目構造によ
り、通電による抵抗発熱量がゼロないしは少量に
とどまる部分が生じる。例えば、第１図のように
互いに直交する格子々による方眼状の格子構造を
もつストレーナの場合、一方の電極端子３から他
方の電極端子３に向かう格子々に対して直角方向
に延在する格子々部分は、抵抗発熱がないが、そ
の格子々部分は、それと直交する格子々部分が抵
抗発熱により昇温するに伴い、その格子々部分か
らの伝導および輻射伝熱により給熱される結果、
網目部２の格子全体の温度が高められる。従つ
て、ストレーナを金属溶湯流路内に設置し、鋳造
開始に先立ち通電によりストレーナを加熱昇温す
る場合は、抵抗発熱による高温部分から、抵抗発
熱のない部分や抵抗発熱のみでは所定温度に達し
ない部分に対する伝導・輻射伝熱により網目部の
全体が所定の温度に達するまでの時間を見込んで
通電を開始する。その通電による加熱所要時間は
後記実施例にも示すように比較的短くてすむ。ま
た、ストレーナ自体を加熱しているのであるか
ら、従来のように鋳型の外部から給熱して間接的
にストレーナを加熱する場合と異なつて、エネル
ギの無駄がないだけでなく、鋳型に対する熱的悪
影響も実質的に皆無である。 Note that due to the mesh structure of the mesh portion 2 of the strainer, there are portions where the amount of resistance heat generated by energization remains zero or a small amount. For example, in the case of a strainer having a grid-like grid structure with mutually orthogonal grids as shown in FIG. 1, the grids extend perpendicularly to the grids from one electrode terminal 3 to the other electrode terminal There is no resistance heat generation in each section, but as the grid section perpendicular to it rises in temperature due to resistance heat generation, heat is supplied by conduction and radiation heat transfer from the grid section.
The temperature of the entire grid of the mesh portion 2 is increased. Therefore, when installing a strainer in a molten metal flow path and heating the strainer by energizing it to raise its temperature prior to the start of casting, it is difficult to reach the specified temperature from the high temperature part due to resistance heat generation, or from the high temperature part due to resistance heat generation, or to the predetermined temperature with only resistance heat generation. The energization is started in anticipation of the time required for the entire mesh portion to reach a predetermined temperature due to conduction/radiation heat transfer to the portions that are not covered. The time required for heating by energization is relatively short, as will be shown in Examples below. In addition, since the strainer itself is heated, unlike the conventional method of indirectly heating the strainer by supplying heat from outside the mold, there is not only no wasted energy, but also no adverse thermal effects on the mold. There are virtually no such cases.
本発明のストレーナ１は、導電性耐火物からな
る点および通電のための電極端子を有する点を除
き、その形状・構造は、従来知られている耐火物
製ストレーナのそれと異なるものである必要はな
い。また、本発明ストレーナを製造するには、従
来の耐火物製ストレーナと同様に、例えば押出し
加工と、焼成処理とからなる製造法を適用すれば
よく、あるいは発泡セラミツク焼成品の製造手法
を適用すればよい。なお、本発明ストレーナにお
いて、導電性を必要とするのは、網目部２とこれ
に通電するための電極端子３部分であるから、網
目部２を囲む外縁４等は、導電性を有しないセラ
ミツク材料、例えばアルミナ等であつてもよい。 The strainer 1 of the present invention does not need to be different in shape and structure from that of conventionally known refractory strainers, except that it is made of a conductive refractory and has electrode terminals for conducting electricity. do not have. Furthermore, in order to manufacture the strainer of the present invention, it is sufficient to apply a manufacturing method consisting of extrusion processing and firing treatment, for example, in the same way as conventional refractory strainers, or a manufacturing method for foamed ceramic fired products may be applied. Bye. In the strainer of the present invention, what requires conductivity is the mesh portion 2 and the electrode terminal 3 portion for supplying electricity to the mesh portion 2, so the outer edge 4 surrounding the mesh portion 2, etc. is made of ceramic that does not have conductivity. It may also be made of a material such as alumina.
本発明のストレーナは、鋳型の造型中または造
形後に、鋳造金属溶湯流路内、例えば湯口、ある
いは湯道の途中などの適宜の個所に設置される。
その設置態様は、電極端子３に通電のためのリー
ド線が接続される点を除いて、従来の耐火物製ス
トレーナのそれと異なるものではない。第２図
は、砂型１０で形成された湯口部１１に本発明ス
トレーナ１を設置した例、第３図は湯道１２の途
中に本発明ストレーナ１を設置した例をそれぞれ
示す。ストレーナの設置個数は任意であり、例え
ば、網目のサイズが段階的に異なる複数個のスト
レーナが溶湯流路内に適当な間隔をおいて設置さ
れることもある。 The strainer of the present invention is installed at an appropriate location within the molten metal flow path, such as at a sprue or in the middle of a runner, during or after molding.
Its installation mode is not different from that of a conventional refractory strainer, except that a lead wire for electricity supply is connected to the electrode terminal 3. FIG. 2 shows an example in which the strainer 1 of the present invention is installed in a sprue 11 formed by a sand mold 10, and FIG. 3 shows an example in which the strainer 1 of the invention is installed in the middle of a runner 12. The number of strainers to be installed is arbitrary; for example, a plurality of strainers with mesh sizes that differ in stages may be installed at appropriate intervals within the molten metal flow path.
溶湯流路内に設置されたストレーナ１は、その
電極端子３にリード線５が接続され、鋳造開始に
先立つて、通電により所要の高温度に加熱保持さ
れる。なお、電極端子３にリード線を接続するに
は、例えば電極端子３を金属製クリツプではさみ
リード線に継げばよい。 A lead wire 5 is connected to the electrode terminal 3 of the strainer 1 installed in the molten metal flow path, and prior to the start of casting, the strainer 1 is heated and maintained at a required high temperature by being energized. In order to connect the lead wire to the electrode terminal 3, for example, the electrode terminal 3 may be connected to the lead wire by using a metal clip.
溶湯流路内に設置されたストレーナ１の目詰り
防止に必要な加熱温度は、鋳造される金属溶湯の
材質・鋳造量、鋳造方案、鋳型の種類等に応じて
適宜調節さる。普通鋳鋼、合金鋳鋼（例えば、ス
テンレス鋳鋼、耐熱鋳鋼、耐摩耗鋳鋼）等の各種
鋳鋼の鋳造に対しては、約500℃以上であるのが
好ましい。加熱温度の上限の規定は必要ないが、
通常は約1200℃までの加熱で十分である。非鉄鋳
物の鋳造においても、この温度範囲の加熱により
好結果を得ることができる。 The heating temperature necessary to prevent clogging of the strainer 1 installed in the molten metal flow path is adjusted as appropriate depending on the material of the molten metal to be cast, the amount of casting, the casting method, the type of mold, etc. For casting various cast steels such as ordinary cast steel and alloy cast steel (for example, stainless steel cast steel, heat-resistant cast steel, and wear-resistant cast steel), the temperature is preferably about 500° C. or higher. Although it is not necessary to stipulate the upper limit of heating temperature,
Heating to about 1200°C is usually sufficient. Even in the casting of non-ferrous castings, good results can be obtained by heating within this temperature range.
ストレーナが所要の高温度に加熱されたのち、
直ちに鋳造が開始される。ストレーナへの通電は
鋳造開始直前に停止される。十分な高温度に加熱
されていれば、鋳造開始後引続いて通電する必要
がないからであり、また安全上からも鋳造開始に
当つて通電を停止するのがよい。 After the strainer is heated to the required high temperature,
Casting will begin immediately. Electricity to the strainer is stopped immediately before the start of casting. This is because if it is heated to a sufficiently high temperature, there is no need to continue energizing after the start of casting, and for safety reasons, it is better to stop energizing when starting casting.
鋳込まれる金属溶湯Ｍに付随して流入した非金
属介在物はストレーナ１で漉し取られる。漉し取
られた非金属介在物は、溶湯より比重が小さいの
で、第２図の例ではストレーナ１の前面から上方
に離脱し溶湯面上に浮上する。第３図のようにス
トレーナ１が水平な湯道１２に設置されている場
合は、漉し取られた非金属介在物はストレーナ１
の前面に滞溜するので、これをストレーナ１の前
面から除去するには、図示のように、ストレーナ
の前面側の湯道天井面に凹陥部１３を設けてお
き、該凹陥部内に非金属介在物をトラツプするよ
うにすればよい。 Non-metallic inclusions that have flowed into the molten metal M to be cast are strained out by a strainer 1. Since the non-metallic inclusions that have been strained out have a specific gravity lower than that of the molten metal, in the example shown in FIG. 2, they separate upward from the front surface of the strainer 1 and float on the surface of the molten metal. When the strainer 1 is installed in a horizontal runner 12 as shown in Fig. 3, the strainer 1
To remove this from the front surface of the strainer 1, a recess 13 is provided on the runner ceiling surface on the front side of the strainer, as shown in the figure, and a non-metallic material is inserted into the recess. All you have to do is trap things.
第１図に示すように格子状網目部を有するスト
レーナＡおよびＢを製作した。
Strainers A and B having lattice mesh portions as shown in FIG. 1 were manufactured.
〔〕 形状
縦：75×横：75×厚さ：15（mm）
孔径：２×２（mm）
網目部の開孔断面積比：70％
〔〕 材質
ストレーナＡ：SiC60％、Al2O338％、その
他（SiO2等）２％
ストレーナＢ：SiC50％、Cr3C240％、
Al2O310％、電極端子金属板：銅
〔〕 昇温特性
電圧200V、電流2Aの通電によりストレーナ
Ａは約20分で、ストレーナＢは約10分で、網目
部の温度は略500℃以上に達する。[] Shape Length: 75 x Width: 75 x Thickness: 15 (mm) Hole diameter: 2 x 2 (mm) Open pore cross-sectional area ratio of mesh part: 70% [] Material Strainer A: SiC60%, Al 2 O 3 38%, other (SiO 2 etc.) 2% Strainer B: SiC 50%, Cr 3 C 2 40%,
Al 2 O 3 10%, electrode terminal metal plate: copper [] Temperature rise characteristics When energized with a voltage of 200V and a current of 2A, strainer A takes about 20 minutes and strainer B takes about 10 minutes, and the temperature of the mesh part reaches about 500℃. reach more than that.
上記ストレーナＡおよびＢを第３図に示すよう
に湯道１２に埋設し、200V・2Aの電流を通じ、
ストレーナＡは約20分を要し、ストレーナＢは約
10分を要して加熱したのち、SCS13溶湯を鋳込み
バルブ素材を鋳造した。鋳造温度は1550℃、鋳造
量は200Kgである。 The strainers A and B are buried in the runner 12 as shown in Figure 3, and a current of 200V/2A is passed through them.
Strainer A takes about 20 minutes and strainer B takes about 20 minutes.
After heating for 10 minutes, molten SCS13 was poured into the valve material. The casting temperature is 1550℃ and the casting amount is 200Kg.
いずれの鋳造例においても、ストレーナの目詰
まりはなく所定の鋳造を完了した。 In all casting examples, the strainer was not clogged and the prescribed casting was completed.
比較例として、上記ストレーナＡおよびＢを、
通電による加熱を行わない点を除いて上記と同一
の条件の鋳造を行つたが、いずれの場合も、鋳造
量が約10％（20Kg）に達した時点で、ストレーナ
の目詰まりにより湯道が閉塞し、鋳造を達成する
ことができなかつた。 As a comparative example, the above strainers A and B were
Casting was carried out under the same conditions as above except that heating by electricity was not carried out, but in both cases, when the casting amount reached approximately 10% (20 kg), the runner was blocked due to clogging of the strainer. It was occluded and casting could not be achieved.
本発明ストレーナは、それ自身が抵抗発熱体と
して、発熱昇温するので、
(i) 溶湯流路内に設置された状態において、外部
からの給熱による加熱方式に比し、熱エネルギ
ーの無駄がないうえに、鋳型の損傷（有機鋳型
の場合の鋳型の崩壊、金型鋳型の場合の表面ス
ケールの発生等）を伴うことなく、目詰り防止
に必要な高温度に容易かつ迅速に加熱すること
ができる。
Since the strainer of the present invention itself generates heat and increases temperature as a resistance heating element, (i) when it is installed in the molten metal flow path, there is less waste of thermal energy compared to a heating method that uses external heat supply; In addition, it can be easily and quickly heated to the high temperatures required to prevent clogging without damaging the mold (such as mold collapse in the case of organic molds or the development of surface scale in the case of metal molds). I can do it.
(ii) 従つて、セラミツクシエル鋳型が使用される
精密鋳造のみならず、金型や砂型による一般の
鋳造方式による各種鋳鉄・鋳鋼鋳物、非鉄鋳物
等の鋳造において、溶湯の凝固・目詰りを生じ
ることなく、非金属介在物の製品部への流入を
防止し、清浄で健全な鋳物製品を得ることがで
きる。また、ストレーナは十分な高温度に加熱
されているので、鋳造時のスポーリングによる
破損を生じることもない。(ii) Therefore, solidification and clogging of molten metal occur not only in precision casting using ceramic shell molds, but also in casting of various cast iron, cast steel castings, non-ferrous castings, etc. by general casting methods using metal molds and sand molds. It is possible to prevent non-metallic inclusions from flowing into the product part and obtain a clean and sound cast product. Furthermore, since the strainer is heated to a sufficiently high temperature, damage due to spalling during casting will not occur.
なお、本発明ストレーナは、砂型、金型におけ
る置注鋳造のみならず、遠心鋳造における溶湯流
路内（例えば、遠心鋳造鋳型の端部開口にのぞむ
鋳込みホツパから樋の間）に設置して使用するこ
とも可能なことは言うまでもない。 The strainer of the present invention can be used not only for in-place casting in sand molds and metal molds, but also by installing it in the molten metal flow path in centrifugal casting (for example, between the pouring hopper and the gutter extending into the end opening of the centrifugal casting mold). Needless to say, it is possible to do so.
第１図は本発明ストレーナの例を示す斜視図、
第２図および第３図は本発明ストレーナの設置態
様を例示する断面説明図である。
１：ストレーナ、２：網目部、３：電極端子、
５：リード線、１０：砂型、１１：湯口、１２：
湯道。
FIG. 1 is a perspective view showing an example of the strainer of the present invention;
FIGS. 2 and 3 are cross-sectional explanatory views illustrating the installation mode of the strainer of the present invention. 1: Strainer, 2: Mesh part, 3: Electrode terminal,
5: Lead wire, 10: Sand mold, 11: Sprue, 12:
Yudo.
Claims (1)
抵抗発熱部からの伝導および輻射伝熱により所要
温度に加熱昇温した状態で金属溶湯の鋳造に使用
される、電極端子を備えた導電性耐火物からなる
鋳造用ストレーナ。1. A conductive refractory equipped with an electrode terminal that is installed in the flow path of the molten metal and is used for casting the molten metal while being heated to the required temperature by resistance heating and conduction and radiation heat transfer from the resistance heating part. Strainer for foundry made of material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4733584A JPS60191638A (en) | 1984-03-12 | 1984-03-12 | Strainer for casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4733584A JPS60191638A (en) | 1984-03-12 | 1984-03-12 | Strainer for casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60191638A JPS60191638A (en) | 1985-09-30 |
| JPS6154506B2 true JPS6154506B2 (en) | 1986-11-22 |
Family
ID=12772335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4733584A Granted JPS60191638A (en) | 1984-03-12 | 1984-03-12 | Strainer for casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60191638A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3546050A1 (en) * | 2018-03-29 | 2019-10-02 | Exentis Knowledge GmbH | Pouring filter |
| US20210023614A1 (en) * | 2018-03-29 | 2021-01-28 | Exentis Knowledge Gmbh | Casting filter |
| CN109865799B (en) * | 2019-04-19 | 2024-04-30 | 秦皇岛燕盛智能科技有限公司 | Foundry goods of middle part arch through-hole and psammitolite, filter screen get and put anchor clamps |
| CN114289707A (en) * | 2021-12-16 | 2022-04-08 | 江苏隆达超合金航材有限公司 | Vacuum induction melting process for improving purity of high-temperature alloy |
-
1984
- 1984-03-12 JP JP4733584A patent/JPS60191638A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60191638A (en) | 1985-09-30 |
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