JPS5924566A - Thin walled and two layered ductile cast iron casting and production thereof - Google Patents
Thin walled and two layered ductile cast iron casting and production thereofInfo
- Publication number
- JPS5924566A JPS5924566A JP13404882A JP13404882A JPS5924566A JP S5924566 A JPS5924566 A JP S5924566A JP 13404882 A JP13404882 A JP 13404882A JP 13404882 A JP13404882 A JP 13404882A JP S5924566 A JPS5924566 A JP S5924566A
- Authority
- JP
- Japan
- Prior art keywords
- casting
- layer
- outer layer
- cast iron
- ductile cast
- 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
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は中空ロール、中空ローラー等の用途に供される
新しい構造を具(1fii した円筒状のン1、す肉二
層ダクタイル鋳鉄鋳物と遠心カタ1造によるその製造法
の提供に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a new structure for use in hollow rolls, hollow rollers, etc. Regarding the provision of law.
例えば中空ロール、ローラーの用途に供される円筒状鋳
物にかいては、その外表面には面]摩耗性が要求さり、
る一方、鋳物全体として充分な強度が要求される場合が
ある。このような場合、第1図、第2図に示すように外
層(1) (3)は高硬度のダクタイル鋳鉄とし、一方
内層(2)(4)は低硬度のダクタイル鋳鉄とする二層
構造の複合ダクタイル鋳鉄鋳物を用いることが知られて
いる。For example, for cylindrical castings used for hollow rolls and rollers, the outer surface is required to have surface wear resistance.
On the other hand, there are cases where sufficient strength is required for the casting as a whole. In such cases, as shown in Figures 1 and 2, a two-layer structure in which the outer layers (1) and (3) are made of high-hardness ductile cast iron, while the inner layers (2) and (4) are made of low-hardness ductile cast iron. It is known to use composite ductile iron castings.
ところで、このような複合鋳物は遠心力鋳造により製造
されるのが普通であるが、このさい第1図に示すように
、外層厚さ1+が60闘以上、又内層厚さt、が50M
以上、即ち円筒鋳物の全体厚さが80朋以上もあるよう
な場合では、製造」二別段問題ない。すなわち、この場
合ではその長さ!にもよるが、いずれにしても鋳込型部
がかなりの量となるため、異なる成分、合金企の外層、
内層用のダクタイル鋳鉄H@を各々別々に溶解4すnし
てかき、とhらを順次に回転金型に鋳込むいわゆる一般
の複合遠心力鋳造法に従えばよいからである。Incidentally, such composite castings are usually manufactured by centrifugal casting, but in this case, as shown in Fig. 1, the outer layer thickness 1+ is 60 mm or more, and the inner layer thickness t is 50 mm.
In the case where the total thickness of the cylindrical casting is 80 mm or more, there is no particular problem in manufacturing. That is, in this case its length! However, in any case, since the casting mold part is quite large, different compositions, outer layers of alloys, etc.
This is because it is sufficient to follow the so-called general composite centrifugal casting method in which the ductile cast iron H@ for the inner layer is separately melted and cast, and then cast into a rotary mold in sequence.
しかし乍ら、円筒鋳物が第2図に示すように、全体厚さ
が70朋よりも薄く、しかもその外層厚さtsが25y
tts以下、例えば外層厚さtslzE5〜15ツ程度
で内層厚さt4も45朋以下のような場合では、現造上
非常忙困薦りな問題を生じる。こi″Lは、とのような
場合外層(3)及び内層(4)の各詰込M−計が非常に
少ないものとなるためである6例えば外径300φ、長
さA=500yutt、外層厚さts=jD7N、m、
内層厚さb=1571Jのものの場合では1.外層重量
33砂、内層重量45絃で、これに外内面での加工代分
を加味したとしても外層及び内層の各鋳込溶湯Mり、け
非常に少ないものとなる。しかるに、かかる場合もし別
々の溶解炉で外層及び内層JT4のダクタイル鋳鉄溶湯
を溶製し、さらに別々の取鍋がらこれらを二層鋳造しよ
うとすれば、その生産性や経済性の面での劣悪は免かれ
ないのみならず%鋳込湯度の低下の問題や内層の鐙込み
のタイミングの難から目的上して得ることができなくな
るだめである。However, as shown in Figure 2, the overall thickness of the cylindrical casting is thinner than 70 mm, and the outer layer thickness ts is 25 mm.
If the outer layer thickness is less than tts, for example, the outer layer thickness is about tslzE5 to 15 mm and the inner layer thickness t4 is also less than 45 mm, a very difficult problem arises in actual manufacturing. This i''L is because the packing M-meter of the outer layer (3) and the inner layer (4) will be very small in the case of 6 For example, outer diameter 300φ, length A=500yutt, outer layer Thickness ts=jD7N, m,
In the case of the inner layer thickness b=1571J, 1. The weight of the outer layer is 33 sand, and the weight of the inner layer is 45 strings, and even if the machining allowance for the outer and inner layers is taken into account, the amount of molten metal M for casting in the outer layer and the inner layer is very small. However, in such a case, if one were to melt the molten ductile cast iron for the outer layer and inner layer JT4 in separate melting furnaces and then cast them in two layers from separate ladles, the productivity and economic efficiency would be poor. Not only is this unavoidable, but it is also impossible to achieve the intended purpose due to the problem of a decrease in the molten metal content and the difficulty in timing the stirrup of the inner layer.
本発明はこのような技術的問題点を克服するため、外層
に耐摩耗性、内層に強靭性の必要とされる特に薄肉二層
のダクタイル鋳鉄鋳物について、上記のような製造上の
困!7+11:を被らない高性能を具備する新しい二層
構造のものを提供するものであシ、同時に遠心力鋳造に
よるその好適な製造法を提供するものである。In order to overcome these technical problems, the present invention solves the above-mentioned manufacturing difficulties, especially for thin-walled two-layer ductile iron castings, which require wear resistance in the outer layer and toughness in the inner layer. The object of the present invention is to provide a new two-layer structure having high performance that does not suffer from 7+11:, and at the same time to provide a suitable manufacturing method thereof by centrifugal casting.
本発明の薄肉二層ダクタイル鋳鉄鋳物は、全体肉厚が7
0朋以下、外層厚さが25M以下の円筒体からなる薄肉
二層鋳物であって、外層は硬度11s50以上の耐摩耗
性を有するダクタイル鋳鉄からなり、一方向層はSi含
有量が高いことを除いては外層とIヨぼ同一の成分範囲
を有し、かつ硬度11s50以下の強靭性を有するダク
タイル鋳鉄からなることを特徴とするものである。また
本発明の製造法は、遠心力鋳造により動向二層の円筒鋳
物を鋳造するに当り、オず外層用のダクタイル鋳鉄溶湯
により外層を鋳込み、次いで上記外層用のダクタイル鋳
鉄溶湯にSi分で0.05〜06%接種してなる内層用
のダクタイル鋳鉄溶湯に、より内層を鋳込むことを特徴
とするものである。The thin two-layer ductile iron casting of the present invention has an overall wall thickness of 7.
It is a thin two-layer casting made of a cylindrical body with a hardness of 11s50 or more and an outer layer thickness of 25M or less. It is characterized by having the same composition range as the outer layer except for the outer layer, and being made of ductile cast iron having a hardness of 11s50 or less. In addition, in the production method of the present invention, when casting a two-layer cylindrical casting by centrifugal force casting, the outer layer is cast using molten ductile cast iron for the outer layer, and then the molten ductile cast iron for the outer layer is added with a Si content of 0. This method is characterized in that the inner layer is cast into the molten ductile cast iron for the inner layer, which is inoculated with .05 to .06%.
以下本発明に係る動向二層ダクタイル鋳鉄鋳物をその製
造法と共に説明して行く。そこで先ず、本発明が特に全
体肉厚70M以下、外層厚さ25朋以下のものを対象と
していることの技術的意味につい−Cから明らかにする
。目的とする円筒鋳物の全体肉厚が大きい場合では、そ
の鋳込重重(も大きく、従って外層と内層とを別々の成
分のものとし、別々の溶解炉で溶解し、さらにこれらを
別々の取鍋に準備すること本容易に行なえるのけ前述の
通りである。しかし、全体肉厚がある限界の大ぎさを下
回る場合では、上記のような製造手段によることが困ψ
IEであって、全体肉厚7ontyn以下の限定はまさ
にこのような製造条件の置部性に列する臨界的な意味を
もつものである。また外層厚さについては、そ11があ
る程度大きいものであれば、外層が凝固するオでの時間
が長くなり、たとえ全体肉厚がある程度薄いものとされ
て(その間に内層用の取鍋を鋳造機の前にセットする等
に必要な時間的余裕を生じ、製造条件も緩和される。し
かし、全体肉厚が薄く、かつ又外層厚さがある限度より
も薄い場合では、外層の鋳込溶湯量が少なく、長さの短
い製品のときでは千の鋳込□型側が100KFを割るこ
ともあり、加えて内層の鋳込型−h1.も少ガいため、
鎧込篇1度と内層を6<G込むまでの作業に非常な困何
1を伴うことになる。実際、かかる場合においては、外
層鋳込後内層飴込み1での時間が1分程度となるときが
あるが、1分間で外層用取鍋と内層用取鍋の入替を完了
することは不可能である。The trend two-layer ductile iron casting according to the present invention will be explained below along with its manufacturing method. First, the technical meaning of the fact that the present invention is particularly directed to a device with an overall wall thickness of 70 mm or less and an outer layer thickness of 25 mm or less will be clarified from -C. When the overall wall thickness of the target cylindrical casting is large, the casting weight is also large, so the outer layer and inner layer are made of different components, melted in separate melting furnaces, and then melted in separate ladles. However, if the overall thickness is less than a certain limit, it may be difficult to use the above manufacturing method.
For IE, the limitation that the total thickness is 7 tonty or less has a critical meaning that corresponds to the ease of mounting under such manufacturing conditions. Regarding the thickness of the outer layer, if the outer layer is relatively large, the time it takes for the outer layer to solidify will be longer, and even if the overall thickness is thinner to some extent (during that time, the ladle for the inner layer will be cast). This allows time for setting the material in front of the machine and eases the manufacturing conditions.However, if the overall wall thickness is thin and the outer layer thickness is thinner than a certain limit, the molten metal for casting of the outer layer When the quantity is small and the product is short in length, the 1,000-inch casting mold side may be less than 100KF, and in addition, the inner layer casting mold - h1. is also small.
It would be very difficult to put in the armor once and the inner layer by 6<G. In fact, in such cases, the time required to pour the inner layer 1 after the outer layer is poured may be about 1 minute, but it is impossible to complete the exchange of the outer layer ladle and the inner layer ladle in 1 minute. It is.
すなわち、外層厚さ25期以下の限定は上記の如くやは
り製造条件の困難性に対する臨界的な意味をもつもので
ある。このよう−に全体肉厚70朋以下、外層厚さ25
朋以下の条件は、従来製造困it′IIt:であったも
のの範囲を意味し、換言すれば本発明が特に有効なもの
として実施される円筒二層Sイi物の条件を特定するも
のである。That is, the limitation of the outer layer thickness to 25 layers or less has a critical meaning in view of the difficulty of manufacturing conditions as described above. In this way, the overall wall thickness is 70 mm or less, and the outer layer thickness is 25 mm.
The following conditions refer to the range of products that have conventionally been difficult to manufacture, in other words, they specify the conditions for a cylindrical two-layer silicon product under which the present invention is particularly effective. be.
次に本発明が対象とする薄肉円筒鋳物についてこれを外
内二層構造のものとしなければならない理由を述べる。Next, the reason why the thin-walled cylindrical casting, which is the subject of the present invention, must have a two-layered structure (outer and inner) will be described.
これは薄肉鋳物の特質として、単−月質でその外層と内
層に各所要の性質を兼備させることができないためであ
る。例えば全体肉厚が25Mのものでは、外層が10朋
であるとするとその内層は15朋しかない。この場合全
体が薄いので強度を確保することができない。このこと
は仮に全体肉厚80m、nで外層厚さが10M謂のもの
であitば、内層け70朋もあるため左程強靭な側室で
なくとも単一材質で十分強度が保持できるのと相違する
。This is because the characteristic of thin-walled castings is that they are monolunar and cannot have both the outer and inner layers possessing the required properties. For example, in a case where the overall thickness is 25M, if the outer layer is 10 mm, the inner layer is only 15 mm. In this case, since the entire structure is thin, strength cannot be ensured. This means that if the overall wall thickness is 80 m, and the outer layer thickness is 10 m, then the inner layer is 70 m, so even if the side chamber is not as strong as the one shown above, sufficient strength can be maintained with a single material. differ.
オた薄肉鋳物を一体の相貫で鮪込んだ場合、全体の凝固
が速く、外面内面共に急冷凝固することにより硬い側室
となり易いことも考慮する必要がある。そして又、軟い
低硬度の側室で一体に鋳造した場合では、強度は満足で
きても外面の耐摩耗性に不足する。従って、薄肉円筒り
f物に所期の性質を兼&nするためKは二層構造のもの
とし、特に内層は低硬度のもので強度を確保する必要が
ある。It is also necessary to take into account that when thin-walled castings are milled in one piece, the entire solidification process is rapid, and both the outer and inner surfaces are rapidly solidified, resulting in a hard side chamber. Furthermore, in the case of integral casting with a soft side chamber of low hardness, even if the strength is satisfactory, the wear resistance of the outer surface is insufficient. Therefore, in order to provide the desired properties to a thin cylindrical product, K should have a two-layer structure, and in particular, the inner layer must have a low hardness to ensure strength.
しかして本発明の薄肉二層ダクタイル涛鉄鋳物にあって
は、その外層を硬度)1s50以上の面J摩耗性を有す
るダクタイル鋳鉄で形成する。ここに硬度H850以上
を条件とするのは、使用層として<16要な耐摩耗性を
確保するためであり、こit k−F回るIf度のもの
では耐摩耗性に不十分となるためである。In the thin two-layer ductile cast iron casting of the present invention, the outer layer is formed of ductile cast iron having surface J abrasion resistance of 1s50 or more. The reason why the hardness is required to be H850 or higher is to ensure the required wear resistance for the layer used, and if the hardness is rated at k-F, the wear resistance is insufficient. be.
外層用のダクタイ)v 鋳鉄として、好適なものの一例
を掲げれば、次の通りである。Duct ties for the outer layer) v Examples of suitable cast iron are as follows.
外層用ダクタイル鋳鉄の成分例(t−鼠%)CSi
Mn P S Ni Cr Mo Mg6
0〜5.7 1.1〜2.3 0.2〜1.0 0.1
> 0.02) 4.0) 0.1〜0.8 0.5:
> 0.03(な訃外層の鋳込みにさいしては、必要に
応じ若干月1の接filを行なうことを妨げない。す々
わち、ダクタイル鋳鉄はMgにより黒鉛の球状化を図る
のが通例であるが、このさいMgは白銑化作用が大きく
、接種しないか若しくは隆種畠、が少々い場合では、黒
鉛化が少々〈炭化物の多い硬い組織となり面1摩耗性の
向上に富力し得るからである・−力木発明に係る二層鋳
物の内層は、そのSi含−有量が高いことを除いては上
に例示したものとほぼ同一の成分範囲を有し、かつ硬度
11850以下の強靭性を有するダクタイル鋳鉄で形成
される。す々わち、内層は外層と元湯を共通し、外層用
の溶湯に適量の1ν種処理したものを當I込んでなるも
のである。ここに硬度11850以下を条件とするのは
、外層とは逆に必要とされる強靭性を確保するためであ
り、これを上回る硬度のものでは脆い材質となるだめで
ある。Example of composition of ductile cast iron for outer layer (t-%) CSi
Mn P S Ni Cr Mo Mg6
0~5.7 1.1~2.3 0.2~1.0 0.1
>0.02) 4.0) 0.1~0.8 0.5:
> 0.03 (When casting the outer layer, it is possible to carry out a contact film once a month if necessary. In other words, in ductile cast iron, it is customary to use Mg to make the graphite spheroidal. However, in this case, Mg has a strong whitening effect, and if it is not inoculated or if there is a small amount of fertilization, graphitization will occur slightly (a hard structure with many carbides will be formed, which can be very effective in improving surface 1 abrasion properties). The inner layer of the two-layer casting according to the strength wood invention has almost the same composition range as the one exemplified above, except that the Si content is high, and the inner layer has a hardness of 11,850 or less. It is made of tough ductile cast iron.In other words, the inner layer shares the same source metal as the outer layer, and the molten metal for the outer layer is treated with an appropriate amount of 1ν type treatment. The reason for requiring the hardness to be 11,850 or less is to ensure the required toughness, contrary to the outer layer, and if the hardness exceeds this, the material will be brittle.
このような目的とする二層鋳物を得るための製造方法に
ついて説明すると、まず外層用のダクタイル釘■鉄溶湯
(予め外層と内層に必安な机を用意する)を回転金型に
25朋以下の所定厚さH込み、従来通りの遠心力鋳造に
供する。その後所定のタイミングで内層溶湯を鋳込むに
さいしては、従来のように別途溶角1「準備された興な
る成分範囲のものを用いることなく、外層の鋳込みに供
した取鍋の残りの溶湯(外層用のダクタイル鋳鉄溶湯)
ニ接種して、これを内層用のダクタイル鋳鉄溶湯として
回転金バMに鋳込み、遠心力鋳造する。即ち本発明の1
1!造方法では、必要なダクタイル鋳鉄溶湯は1種類の
みであり、寸た取鍋等の鮪込装ff?(も単一で足る。To explain the manufacturing method for obtaining the desired two-layer casting, first, ductile nails for the outer layer and molten iron (prepared in advance for the outer layer and inner layer) are placed in a rotary mold with a thickness of 25 mm or less. A predetermined thickness of H is included and subjected to conventional centrifugal force casting. After that, when pouring the inner layer molten metal at a predetermined timing, instead of using a separately prepared molten metal with a different composition range as in the past, the remaining molten metal in the ladle used for casting the outer layer is used. (molten ductile cast iron for outer layer)
This is poured into a rotary metal bath M as a molten ductile cast iron for the inner layer, and centrifugally cast. That is, 1 of the present invention
1! In the manufacturing method, only one type of ductile cast iron molten metal is required, and the tuna ware such as a small ladle is used. (Also, a single one is sufficient.
外層用溶湯に苅する接fl■方法は、外層の鋳込完了後
直接取鍋の残りの溶湯に接種するようにしてもよいし、
内層の釘1込みと同時に接種するように;〜でもよい。The method of inoculating the molten metal for the outer layer may be to directly inoculate the remaining molten metal in the ladle after the completion of casting the outer layer, or
It may be inoculated at the same time as the nail in the inner layer.
外層用溶湯に列する接種)8けSi分で005〜0.6
%が適当である。すなわち、内層は黒鉛化を十分促進さ
せ低硬度で強靭性のある月利とする必要があり、そのた
めにf−1: 0.C15%以下の接種Jπでは接種効
果が不十分となるためである。又一方、接種賦が06%
以上になると、内層の鋳込型111が少ないため鋳込温
度の低下が大きく力ると共に、愚(イ)の形状不良、介
在物の多い鋳物となり、ダクタイル鋳鉄f鉄としての機
能が損われるためである。な” S I 47!′ff
には、81分75%のFe−3i、Si分50%のFe
−3iその他の灰種効果の大きい腔、M剤を用いノア、
ばよい。Inoculation in line with the molten metal for the outer layer) 005 to 0.6 for 8 pieces of Si
% is appropriate. That is, the inner layer must sufficiently promote graphitization to have low hardness and toughness, and for this purpose f-1: 0. This is because the inoculation effect will be insufficient if the inoculation Jπ is less than 15% C. On the other hand, the vaccination allowance is 0.6%.
If this is the case, the casting temperature will drop significantly due to the small number of casting molds 111 in the inner layer, and the resulting casting will have poor shape and many inclusions, which will impair its function as ductile cast iron. It is. "S I 47!'ff
81 min 75% Fe-3i, Si content 50% Fe
-3i Other cavities with large gray effect, Noah using M agent,
Bye.
かくして外内層が完全に凝固完了したならば、その黒皮
祐放(−状態もしくは加工により所定の寸法に仕」ユげ
て目的製品を得る。このような製造方法によねば、全体
肉厚が70朋以下の製品、例えば全体肉厚25M謂、外
層厚さ5〜10問、内層厚さ“15〜20闘のものにつ
いても容易に所期の薄肉二層ダクタイル鋳鉄詰物が得ら
れる。そして、この鋳物では内層はSiの接種によりS
i含有量のみが外層に比較して高く、その他の成分は外
層とほぼ同一であることが特徴である。ちなみ釦、外層
用として前に例示した成分範囲のものを使用する場合で
は、内層のSt含有邪゛け1.15〜2.9%に高めら
れる。When the outer and inner layers have completely solidified in this way, the black skin is reduced to a predetermined size by condition or processing to obtain the desired product. According to this manufacturing method, the overall wall thickness is The desired thin-walled two-layer ductile cast iron filling can be easily obtained for products of 70 mm or less, for example, those with an overall wall thickness of 25 mm, an outer layer thickness of 5 to 10 mm, and an inner layer thickness of 15 to 20 mm. In this casting, the inner layer is S by inoculation of Si.
It is characterized in that only the i content is higher than in the outer layer, and the other components are almost the same as in the outer layer. Incidentally, if the outer layer is made of the ingredients within the range of ingredients exemplified above, the St content in the inner layer is increased to 1.15 to 2.9%.
次に実施例を掲げて説明する。Next, examples will be given and explained.
く実施例1〉
鋳放し製品寸法300φX 500−/’、全体肉厚2
2TIA。Example 1> As-cast product dimensions 300φX 500-/', overall wall thickness 2
2TIA.
外層厚さ7〜10朋の二層鋳物を下記の如く製造した。Two-layer castings with an outer layer thickness of 7 to 10 mm were prepared as follows.
但し、金型には内径308φ、長さ600!のものを使
用した。However, the mold has an inner diameter of 308φ and a length of 600mm! I used the one from
まず取鍋にMg処理によシ黒鉛球状化処理したダクタイ
ル鋳鉄溶湯を95?準備した。この溶湯は接種していな
いものである。この外層用溶湯の成分範囲は次の通りで
ある。First, in a ladle, pour molten ductile cast iron that has been treated with Mg to make graphite nodular. Got ready. This molten metal has not been inoculated. The range of components of this molten metal for the outer layer is as follows.
外層用ダクタイル鋳鉄の成分(重量%)CSi Mn
P S Ni Cr Mo Mg3.
461.920.450.0580.0160BOO,
210,0904)46しかしてオず約半量の48Rり
を外層として回転金型に鋳込み、1分後に残りの溶湯に
Si分50%のFe−3tをSi分として0.25%接
種したものを内層として鋳込んだ。Ingredients of ductile cast iron for outer layer (wt%) CSi Mn
P S Ni Cr Mo Mg3.
461.920.450.0580.0160BOO,
210,0904) 46 Then, about half of the 48R was cast into a rotary mold as the outer layer, and after 1 minute, the remaining molten metal was inoculated with 0.25% Fe-3T with a Si content of 50%. Cast as an inner layer.
この結果、第3図に示すように、外表面から7〜8uは
l−1859〜/)1 、それより内部はH837〜3
9の断面硬度分布を有する二層鋳物(複合ローラー)が
得られた。その破断写真を第4図に、まだその外面側及
び内面側の組織を第5図及び第6図に示す。As a result, as shown in Figure 3, 7~8u from the outer surface is l-1859~/)1, and the inside is H837~3
A two-layer casting (composite roller) with a cross-sectional hardness distribution of 9 was obtained. A photograph of the fracture is shown in FIG. 4, and the structures on the outer and inner surfaces are shown in FIGS. 5 and 6.
なおこの鋳物の内層側は接種によりSi含有1;12.
10%となっていた。The inner layer of this casting has Si content of 1; 12. due to inoculation.
It was 10%.
〈実施例2〉
実施例1と同様の製造榮件の下に二層鋳物を下記の如く
製造した。<Example 2> Under the same manufacturing conditions as Example 1, a two-layer casting was manufactured as follows.
まず取鍋に次の成分を有するダクタイル鋳鉄溶湯を準備
した。但し、との溶湯は璋処理後Si分50%のFe−
3tをSi分として0.05%接種したものである。First, a molten ductile cast iron having the following components was prepared in a ladle. However, the molten metal is Fe- with a Si content of 50% after the heating treatment.
3t was inoculated with 0.05% Si content.
外層用ダクタイル鋳鉄の成分(重量%)CSi M
n P S Ni
Cr Mo Mg3.412.250.45
0.0580.0140BOO,220,100,04
5しかして実施例1と同様の鋳込条件で外層を鋳込んだ
後、Si分として0.3%接種したものを内層として鋳
込んだ。Composition of ductile cast iron for outer layer (wt%) CSi M
n P S Ni
CrMo Mg3.412.250.45
0.0580.0140BOO,220,100,04
5 After the outer layer was cast under the same casting conditions as in Example 1, the inner layer was inoculated with 0.3% Si.
この結果、外層厚さ部分8〜10uは硬度Hs52〜5
5となり、残りの内層は硬度l−1s35〜′57であ
った。As a result, the hardness of the outer layer thickness portion 8 to 10u is Hs52 to 5.
5, and the remaining inner layer had a hardness of l-1s35 to '57.
な卦この鋳物の内層側は接種によりSi含有f+2.5
0%となっていた。The inner layer of this casting has a Si content of f+2.5 due to inoculation.
It was 0%.
以上実施例により明らかにした如く、木発明の薄肉二層
ダクタイル鋳鉄鋳物では、鋳込型M゛の少ない薄肉鋳物
でしかも外層厚さが5〜1o朋程度のものであっても、
外層には炭化物の多い耐摩耗性を有し、一方向層には低
硬度の強靭性を有する目標通りの鋳物を得ることができ
る7
木発明は以上に述べた通りであって、従来製造上困何E
な問題のあった特に薄肉二層の円筒鋳物について、その
外層と内層にSi含有量を除き近似するダクタイル鋳鉄
を用いる複合構造を採用したことにより、困り(11な
く目的鋳物を得ることができるのが特徴である。すなわ
ち、木発明に係る二層鋳物の製造にさいしては、外層と
内層用に異なる成分範囲の二種の溶湯を準備する必要は
なく、一種類のダクタイル鋳鉄溶湯のみを準備し、かつ
Go込装置も単一のもので足りるため、その作画上の問
題点が一挙に%”F消されるためである。−力木発明に
係る二層鋳物では、一種類の溶湯のみを用いて鋳造形成
されるものであり乍らも、実質上複合$a物として必要
な性質を十分兼備できるのが特徴である。すなわち、外
層には黒鉛化の少ない高硬爪の耐摩耗性に富むものが得
られる一方、内層には所定接種処理により、黒鉛が微細
に晶出した強靭性に優れたものが得られるためである。As clarified by the above examples, in the thin two-layer ductile iron casting of the wooden invention, even if it is a thin casting with a small casting mold M and the outer layer thickness is about 5 to 1 mm,
It is possible to obtain a casting that meets the target, with the outer layer having abrasion resistance with a large amount of carbide, and the unidirectional layer having low hardness and toughness. Troubled E
For thin-walled two-layer cylindrical castings, which had problems, we adopted a composite structure in which the outer and inner layers are made of similar ductile cast iron except for the Si content. In other words, in manufacturing the two-layer casting according to the Wood invention, it is not necessary to prepare two types of molten metal with different composition ranges for the outer layer and inner layer, but only one type of ductile iron molten metal is prepared. Moreover, since a single go-in device is sufficient, the problems in drawing are eliminated at once. Although it is formed by casting, it is characterized by being able to sufficiently combine the properties required as a substantially composite $a product.In other words, the outer layer has the wear resistance of a high-hardness nail with little graphitization. This is because, on the one hand, the inner layer can be obtained with excellent toughness in which graphite is finely crystallized by a predetermined inoculation treatment.
このような効果は既述の実施例によって十分に裏((J
けられる。Such effects can be fully demonstrated by the above-mentioned embodiments ((J
I get kicked.
第1図と第2図は、薄肉二層円筒鋳物の構造例を現わす
断面図である。第3図は本発明に係る薄肉ニ層円筒鋳物
−例についてその断面の硬度分布を示す図である。第4
図は同突jlli例品−例について被断面を現わす金属
組織の断面図である。第5図と第6図は同実施例品−例
についての顕微釧写真であって、第5図は外面側の&l
i織を、第6図は内面側の組織を示している。
(1) (3)・・・外層、(2) (4)・・・内層
。FIGS. 1 and 2 are cross-sectional views showing an example of the structure of a thin two-layer cylindrical casting. FIG. 3 is a diagram showing the hardness distribution in the cross section of an example of a thin two-layer cylindrical casting according to the present invention. Fourth
The figure is a sectional view of a metal structure showing a cross section of a JLLI example. FIGS. 5 and 6 are microscopic photographs of the same example product, and FIG. 5 is the outer side &l
FIG. 6 shows the inner surface of the i-weave. (1) (3)...outer layer, (2) (4)...inner layer.
Claims (1)
の円筒体からなる薄肉二層鋳物であって、外層は硬度H
850以上の耐摩耗性を有するダクタイル鋳鉄からなり
、一方内層はSi含有量が高いことを除いては外層とほ
ぼ同一の成分範囲を有し、かつ硬度I−■850以下の
強靭性を有するダクタイル鋳鉄から々ることを特徴とす
る薄肉二層ダクタイル鋳鉄鋳物。 2、遠心力’flf造により薄肉二層の円筒鋳物を鋳造
するに当り、まず外層用のダクタイル無鉄溶湯により外
層を鋳込み、次いで上記外層用のダクタイル鋳鉄溶湯に
Si分で0.05〜0.6%接種してなる内層用のダク
タイル鋳鉄溶湯により内層を鋳込むことを特徴とする薄
肉二層ダクタイル鋳鉄鋳物の製造法。[Claims] 1. A thin two-layer casting consisting of a cylindrical body with an overall wall thickness of 70 mm or less and an outer layer thickness of 25 mm or less, the outer layer having a hardness of H.
Made of ductile cast iron with a wear resistance of 850 or higher, the inner layer has almost the same composition range as the outer layer except for a high Si content, and has a hardness of 850 or less. A thin-walled double-layer ductile iron casting that is characterized by being made from cast iron. 2. In casting a thin two-layer cylindrical casting by centrifugal force 'flf' formation, first cast the outer layer using ductile iron-free molten metal for the outer layer, and then add Si content of 0.05 to 0 to the ductile iron-free molten metal for the outer layer. A method for producing thin two-layer ductile iron castings, characterized in that the inner layer is cast using molten ductile iron for the inner layer, which is inoculated with 6% inoculation.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13404882A JPS5924566A (en) | 1982-07-31 | 1982-07-31 | Thin walled and two layered ductile cast iron casting and production thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13404882A JPS5924566A (en) | 1982-07-31 | 1982-07-31 | Thin walled and two layered ductile cast iron casting and production thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5924566A true JPS5924566A (en) | 1984-02-08 |
Family
ID=15119140
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13404882A Pending JPS5924566A (en) | 1982-07-31 | 1982-07-31 | Thin walled and two layered ductile cast iron casting and production thereof |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5924566A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04344806A (en) * | 1991-05-20 | 1992-12-01 | Kubota Corp | Composite roll |
US6358878B1 (en) | 1989-09-28 | 2002-03-19 | Hyperion Catalysis International, Inc. | Carbon fibril-forming metal catalysts |
CN115430820A (en) * | 2022-09-28 | 2022-12-06 | 河北津西钢铁集团重工科技有限公司 | Method for centrifugally casting cast iron roller sleeve |
-
1982
- 1982-07-31 JP JP13404882A patent/JPS5924566A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6358878B1 (en) | 1989-09-28 | 2002-03-19 | Hyperion Catalysis International, Inc. | Carbon fibril-forming metal catalysts |
JPH04344806A (en) * | 1991-05-20 | 1992-12-01 | Kubota Corp | Composite roll |
CN115430820A (en) * | 2022-09-28 | 2022-12-06 | 河北津西钢铁集团重工科技有限公司 | Method for centrifugally casting cast iron roller sleeve |
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