JP2843243B2 - Manufacturing method of corrosion resistant cast iron tube - Google Patents
Manufacturing method of corrosion resistant cast iron tubeInfo
- Publication number
- JP2843243B2 JP2843243B2 JP30809893A JP30809893A JP2843243B2 JP 2843243 B2 JP2843243 B2 JP 2843243B2 JP 30809893 A JP30809893 A JP 30809893A JP 30809893 A JP30809893 A JP 30809893A JP 2843243 B2 JP2843243 B2 JP 2843243B2
- Authority
- JP
- Japan
- Prior art keywords
- cast iron
- corrosion
- aluminum
- resistant
- mold
- 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 - Fee Related
Links
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Mold Materials And Core Materials (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、砂型により鋳造される
異形管等の耐食性鋳鉄管の製造方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a corrosion-resistant cast iron pipe such as a deformed pipe cast by a sand mold.
【0002】[0002]
【従来の技術】従来、鋳鉄管の多くが金型遠心力鋳造法
を利用して製造されており、鋳造後、該鋳鉄管は通常フ
ェライト化焼鈍熱処理が行われるが、焼鈍の際、焼鈍炉
内の酸化性雰囲気に曝されるため、外周面が酸化されて
厚いスケールが生成し易い。そこで、鋳鉄管の外周面に
厚いスケールが生成するのを防止すると共に優れた耐食
性を有する皮膜を形成すべく、焼鈍処理前の鋳鉄管の外
周面にAl又はAl合金皮膜を被着し、該鋳鉄管を焼鈍
熱処理し、前記皮膜を酸化して外周面に酸化アルミニウ
ム皮膜を形成する方法が提案されている(特願平1−2
88535号)。2. Description of the Related Art Conventionally, most cast iron tubes are manufactured using a centrifugal force casting method. After casting, the cast iron tubes are usually subjected to a ferrite annealing heat treatment. Since the inner surface is exposed to the oxidizing atmosphere, the outer peripheral surface is oxidized and a thick scale is easily generated. Therefore, in order to prevent the formation of a thick scale on the outer peripheral surface of the cast iron tube and to form a film having excellent corrosion resistance, an Al or Al alloy film is applied to the outer peripheral surface of the cast iron tube before the annealing treatment. A method has been proposed in which a cast iron tube is annealed and heat-treated, and the film is oxidized to form an aluminum oxide film on the outer peripheral surface (Japanese Patent Application No. 1-2).
88535).
【0003】一方、砂型で鋳造された異形管等の比較的
厚肉の鋳鉄管は、鋳放し状態で基地がフェライト化され
ているため、フェライト化焼鈍を行わないのが通例であ
る。そこで、かかる鋳鉄管の表面の耐食性を向上させる
ために、管表面に溶射金属層を形成する場合もある。該
溶射金属層はポーラスで耐食性が十分でないので、焼鈍
によって溶射金属層を緻密な酸化物層とすることも可能
である。On the other hand, a relatively thick cast iron pipe such as a deformed pipe cast in a sand mold is generally not subjected to ferrite annealing because the base is ferritized in an as-cast state. Therefore, in order to improve the corrosion resistance of the surface of such a cast iron tube, a sprayed metal layer may be formed on the surface of the tube. Since the sprayed metal layer is porous and has insufficient corrosion resistance, the sprayed metal layer can be formed into a dense oxide layer by annealing.
【0004】[0004]
【発明が解決しようとする課題】しかし、砂型鋳造鋳鉄
管の場合、本来フェライト化焼鈍が不要であるにもかか
わらず、耐食性向上のために焼鈍熱処理を必要とし、極
めて不経済でコスト高になるという難点がある。本発明
は、上述のような問題点に鑑みてなされたもので、その
目的とするところは、耐食性の良好な砂型鋳造鋳鉄管を
容易に、かつ経済的に製造しうる方法を提供するにあ
る。However, in the case of a sand-cast cast iron pipe, annealing heat treatment is required to improve corrosion resistance, although ferrite annealing is not originally required, which is extremely uneconomical and costly. There is a disadvantage. The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for easily and economically producing a sand-cast cast iron pipe having good corrosion resistance. .
【0005】[0005]
【課題を解決するための手段】本発明では、上記目的を
達成するために、次の技術的手段を講じた。即ち、本発
明は、鋳鉄管鋳造用砂型の表面の一部又は全部に、鉄と
の合金化が可能な耐食金属であるアルミ又はアルミ合金
を付着し、前記砂型内に鋳鉄溶湯を鋳込むことにより、
溶湯熱で前記耐食金属を溶かして異形鋳鉄管表面の一部
又は全部に、その厚み方向にアルミの含有率が異なる鉄
・アルミ合金からなる耐食合金層を形成することを特徴
としている。According to the present invention, the following technical measures have been taken in order to achieve the above object. That is, the present invention adheres aluminum or an aluminum alloy, which is a corrosion-resistant metal capable of being alloyed with iron, to part or all of the surface of a sand mold for casting a cast iron tube, and forms a molten cast iron in the sand mold. By casting
The corrosion-resistant metal is melted by the heat of the molten metal to form a part or all of the surface of the deformed cast iron pipe , the iron having a different aluminum content in its thickness direction.
-It is characterized by forming a corrosion-resistant alloy layer made of an aluminum alloy .
【0006】[0006]
【作用】本発明によれば、砂型を構成する主型又は/及
び中子型の表面に溶射や塗布等により付着された耐食金
属は、砂型内に鋳鉄溶湯を鋳込むことにより、溶湯熱で
溶融され、鋳鉄と合金化して耐食合金層を形成する。こ
のようにして鋳造された鋳鉄管の外周面又は/及び内周
面には、鋳放し状態で耐食合金層が形成されている。According to the present invention, the corrosion-resistant metal adhered to the surface of the main mold and / or the core mold constituting the sand mold by thermal spraying, coating, or the like is cast by casting the molten cast iron in the sand mold. It is melted and alloys with cast iron to form a corrosion resistant alloy layer. On the outer peripheral surface and / or the inner peripheral surface of the cast iron pipe thus cast, a corrosion-resistant alloy layer is formed in an as-cast state.
【0007】[0007]
【実施例】以下、本発明の実施例を図面に基づき説明す
る。図面は、砂型からなる鋳型1を用いて異形鋳鉄管2
を製造する本発明の一実施例の説明図で、前記鋳型1は
主型1Aと中子型1Bとにより構成されており、主型1
Aの内表面には、鉄との合金化が可能な耐食金属である
Al3を、約150μの厚さで溶射し、その後、中子型
1Bをセットする。Embodiments of the present invention will be described below with reference to the drawings. The drawing shows a deformed cast iron tube 2 using a sand mold 1.
FIG. 1 is an explanatory view of one embodiment of the present invention for manufacturing a mold. The mold 1 is composed of a main mold 1A and a core mold 1B.
On the inner surface of A, Al3, which is a corrosion-resistant metal that can be alloyed with iron, is sprayed with a thickness of about 150 μ, and then a core 1B is set.
【0008】このようにして、Al3が溶射された鋳型
1内に、ダクタイル鋳鉄(C:3.53%,Si:2.
75%,Mg:0.035%)の溶湯4を1370℃で
鋳込み(図2(a)参照)、製品である鋳鉄管2が30
0℃まで冷却された時点で型バラシを行った。溶湯4の
鋳込みによって、Al3が溶融して鉄と合金化し、図2
(b)に示すように鉄・アルミ合金層5が鋳鉄管2の外
周面に皮膜状に形成される。In this way, ductile cast iron (C: 3.53%, Si: 2.
The molten metal 4 of 75%, Mg: 0.035%) is cast at 1370 ° C. (see FIG. 2A), and the product cast iron pipe 2 is 30
When the temperature was cooled to 0 ° C., the mold was disintegrated. By casting the molten metal 4, Al3 is melted and alloyed with iron.
As shown in (b), the iron / aluminum alloy layer 5 is formed on the outer peripheral surface of the cast iron pipe 2 in a film form.
【0009】そこで、鋳造された製品鋳鉄管2を切断し
て、肉厚方向で顕微鏡観察を行ったところ、管外周面側
に約185μの鉄・アルミ合金層5が形成されているこ
とを確認できた。また、鋳鉄管2の顕微鏡試片をEPM
Aによりアルミ濃度分析を行ったところ、前記合金層5
の最外周面には58%のアルミが、またその最内面には
13%のアルミが検出され、良好な耐食金属皮膜が形成
されていることが判明した。Therefore, when the cast product cast iron pipe 2 is cut and observed with a microscope in the thickness direction, it is confirmed that an iron / aluminum alloy layer 5 of about 185 μm is formed on the outer peripheral surface side of the pipe. did it. In addition, a microscope specimen of the cast iron tube 2 was subjected to EPM.
When the aluminum concentration was analyzed by A, the alloy layer 5
And 58% of the aluminum was detected on the outermost surface and 13% on the innermost surface, indicating that a good corrosion-resistant metal film was formed.
【0010】本発明における耐食金属(合金を含む)3
は、溶射に代えて粉末状として鋳型表面に塗布すること
ができ、粉末状の場合は、金属粉末に有機バインダーを
混ぜて塗布してもよい。耐食金属3の溶射又は塗布厚さ
は、80〜300μm程度でよい。上記実施例では、鋳
型1の主型1Aの内面に耐食金属3を溶射したが、耐食
性の要求される部分、例えば中子型1Cの表面又は主型
1A内面と中子型1Cの両方、更には鋳型表面全面に耐
食金属を付着してもよい。[0010] Corrosion resistant metals (including alloys) 3 in the present invention
It can be applied to the mold surface in place of the morphism solvent as a powdery, if the powder form may be applied by mixing an organic binder to the metal powder. The sprayed or applied thickness of the corrosion resistant metal 3 may be about 80 to 300 μm. In the above embodiment, the corrosion resistant metal 3 was sprayed on the inner surface of the main mold 1A of the mold 1, but a portion requiring corrosion resistance, for example, the surface of the core 1C or both the inner surface of the main mold 1A and the core 1C, May be made to adhere a corrosion-resistant metal to the entire surface of the mold.
【0011】本発明は、上記実施例に限定されるもので
はなく、材質上はダクタイル鋳鉄以外の普通鋳鉄にも採
用しうること勿論である。The present invention is not limited to the above-described embodiment, and it goes without saying that the present invention can be applied to ordinary cast iron other than ductile cast iron.
【0012】[0012]
【発明の効果】本発明は、上述のように、鋳鉄管鋳造用
砂型の表面の一部又は全部に、鉄との合金化が可能な耐
食金属であるアルミ又はアルミ合金を付着し、前記砂型
内に鋳鉄溶湯を鋳込むことにより、溶湯熱で前記耐食金
属を溶かして異形鋳鉄管表面の一部又は全部に、その厚
み方向にアルミの含有率が異なる鉄・アルミ合金からな
る耐食合金層を形成することを特徴とするものであるか
ら、耐食性の良好な鋳鉄管を、至極容易に、かつ焼鈍熱
処理を要することなく経済的に得ることができ、大幅に
生産性が向上する。As described above, according to the present invention, aluminum or an aluminum alloy , which is a corrosion-resistant metal capable of being alloyed with iron , is adhered to part or all of the surface of a sand mold for casting cast iron pipes. By casting the molten cast iron into the inside, the corrosion-resistant metal is melted by the heat of the molten metal, and the thickness of the molten metal is partially or entirely formed on the surface of the deformed cast iron pipe.
Iron and aluminum alloys with different aluminum contents in the
Forming a corrosion-resistant alloy layer because characterized in that, a good cast iron pipe of corrosion resistant, extremely easily and economically obtained it can without requiring annealing heat treatment, greatly improved productivity I do.
【図1】本発明の実施例に係る砂型鋳型の中央縦断面図
である。FIG. 1 is a central longitudinal sectional view of a sand mold according to an embodiment of the present invention.
【図2】図1のA部拡大図で、(a)は鋳型内に溶湯を
鋳込んだ直後の状態、(b)は型バラシ前の状態を示し
ている。FIGS. 2A and 2B are enlarged views of a portion A in FIG. 1, wherein FIG. 2A shows a state immediately after casting a molten metal in a mold, and FIG.
1 鋳型 1A 主型 1B 中子型 2 鋳鉄管 3 耐食金属(Al) 4 溶湯 5 鉄・アルミ合金層 DESCRIPTION OF SYMBOLS 1 Mold 1A Main type 1B Core type 2 Cast iron tube 3 Corrosion resistant metal (Al) 4 Molten metal 5 Iron and aluminum alloy layer
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6,DB名) B22D 19/00 B22C 3/00 B22D 19/08──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. 6 , DB name) B22D 19/00 B22C 3/00 B22D 19/08
Claims (1)
に、鉄との合金化が可能な耐食金属であるアルミ又はア
ルミ合金を付着し、前記砂型内に鋳鉄溶湯を鋳込むこと
により、溶湯熱で前記耐食金属を溶かして異形鋳鉄管表
面の一部又は全部に、その厚み方向にアルミの含有率が
異なる鉄・アルミ合金からなる耐食合金層を形成するこ
とを特徴とする耐食性鋳鉄管の製造方法。An aluminum or aluminum which is a corrosion-resistant metal which can be alloyed with iron is partially or entirely provided on a surface of a sand mold for casting a cast iron tube.
By attaching a Lumi alloy and casting a cast iron melt in the sand mold, the corrosion resistant metal is melted by the heat of the melt, and a part or all of the surface of the deformed cast iron pipe has an aluminum content in the thickness direction thereof.
A method for producing a corrosion-resistant cast iron pipe, comprising forming a corrosion-resistant alloy layer made of different iron and aluminum alloys .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30809893A JP2843243B2 (en) | 1993-12-08 | 1993-12-08 | Manufacturing method of corrosion resistant cast iron tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30809893A JP2843243B2 (en) | 1993-12-08 | 1993-12-08 | Manufacturing method of corrosion resistant cast iron tube |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07155929A JPH07155929A (en) | 1995-06-20 |
JP2843243B2 true JP2843243B2 (en) | 1999-01-06 |
Family
ID=17976845
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP30809893A Expired - Fee Related JP2843243B2 (en) | 1993-12-08 | 1993-12-08 | Manufacturing method of corrosion resistant cast iron tube |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2843243B2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001269767A (en) * | 2000-03-27 | 2001-10-02 | Kurimoto Ltd | Method for producing spheroical graphite cast iron product |
JP3723522B2 (en) * | 2001-08-03 | 2005-12-07 | 富士通株式会社 | Metal body manufacturing method |
CN104889339A (en) * | 2015-05-28 | 2015-09-09 | 南京皓威机械有限公司 | Radiating pipeline mould |
-
1993
- 1993-12-08 JP JP30809893A patent/JP2843243B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH07155929A (en) | 1995-06-20 |
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