JPS58116967A - Casting method of shaftlike casting - Google Patents
Casting method of shaftlike castingInfo
- Publication number
- JPS58116967A JPS58116967A JP21353181A JP21353181A JPS58116967A JP S58116967 A JPS58116967 A JP S58116967A JP 21353181 A JP21353181 A JP 21353181A JP 21353181 A JP21353181 A JP 21353181A JP S58116967 A JPS58116967 A JP S58116967A
- Authority
- JP
- Japan
- Prior art keywords
- flux
- shell layer
- outside shell
- casting
- inside surface
- 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
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は軸状鋳物の鋳造方法に関するものであり、と
くに外殻層鋳造段階の直後にその内面に高発熱性のフラ
ックスを導入することで保温しておくことを特徴とする
熱関圧延用ロール醇の複合ロールの鋳造に好適に利用さ
れる方法である。[Detailed Description of the Invention] This invention relates to a method for casting shaft-shaped castings, and is particularly characterized in that heat is maintained by introducing a highly exothermic flux into the inner surface immediately after the step of casting the outer shell layer. This method is suitably used for casting composite rolls for hot rolling rolls.
一般K、製鉄所で使用される圧延用ロールは、内層部(
芯部)を衝撃や応力に対して強い高靭性の材質のもので
構成する一方、外層部(胴部外郭)を耐岸耗性に優れた
材質のものにするとい51P#l!にもとづき複合鋳造
法によって製造されるのが普通である。例えば、遠心力
鋳造によって製造した筒殻状の外殻層に対し、その内部
Km!II金属の内層#!湯を注ぎ込んで合体させる方
法がそれである。General K, rolling rolls used in steel mills have an inner layer (
The core part) is made of a highly tough material that is strong against impact and stress, while the outer layer part (body shell) is made of a material with excellent shore abrasion resistance.51P#l! It is usually manufactured by a composite casting method based on For example, for a cylindrical shell-shaped outer shell layer manufactured by centrifugal casting, its internal Km! II metal inner layer #! The method is to pour hot water into them and let them coalesce.
上記の鋳造法で重要なことは、内層f6fjhの注入ま
での間、先行して鋳造した外殻層の特に内面が酸化しな
いようにすることと、先行−後行する一m湯の拡散を起
させる必要から温度低下をできるだけ少なくすることに
ある。これに対し従来は、酸化防止用のフラックスを噴
入させるに止っている。そのために次のような問題点が
あった。What is important in the above casting method is to prevent oxidation of the previously cast outer shell layer, especially the inner surface, until the injection of the inner layer f6fjh, and to prevent the diffusion of the 1 m molten metal that precedes and follows. The objective is to minimize the temperature drop as much as possible. In contrast, conventional methods have only injected flux to prevent oxidation. This resulted in the following problems.
■ 温度の低下が大きく外殻層内表面側から凝固層が生
成しているため内層材との溶着不良が発生し易い。■ Because the temperature drop is large and a solidified layer is generated from the inner surface of the outer shell layer, poor welding with the inner layer material is likely to occur.
■ 外殻層内表面温度が下っているので後行して注湯す
る内層材の温度を相当高くせねばならない。(外殻層鋳
込温度より+70〜100”C高め)■ 外殻層内表面
からも凝固が進行するので外殻層中央部付近に偏析帯や
ザク巣婢の欠陥が集中し易い。■ Since the inner surface temperature of the outer shell layer has fallen, the temperature of the inner layer material that is poured later must be raised considerably. (+70 to 100"C higher than the casting temperature of the outer shell layer) ■ Since solidification also proceeds from the inner surface of the outer shell layer, defects such as segregation zones and rough spots tend to concentrate near the center of the outer shell layer.
この発明は、上述した従来鋳造技術のもつ問題を克服す
ることを目的とするもので、そのための有効な方法とし
て外殻層内表面の凝固殻の発生。The present invention aims to overcome the problems of the conventional casting techniques described above, and an effective method for this purpose is to generate a solidified shell on the inner surface of the outer shell layer.
成長を極力抑えるため、早期燃焼型の高発熱性フラック
スを使うようにした技術である。それkよって昧外殻層
内表面温度の低下ならびに酸化を防止し、望ましい外殻
層−内層の溶着な果すことかで舞る。以下にこの発明の
構成の詳細を説明する。In order to suppress growth as much as possible, this technology uses a fast-burning, highly exothermic flux. Therefore, a decrease in the inner surface temperature of the outer shell layer and oxidation are prevented, thereby achieving the desired outer shell layer-inner layer welding. The details of the configuration of this invention will be explained below.
本発明鋳造方法は、遠心力鋳造で得た外殻層内嵌1ii
rに先ず常法通りの低融点の酸化防止用フラックスを噴
入させてこれを被成する。そして、その操作に引きつづ
き直ちにビーク温度に達するまでが3分以内の早期燃焼
型で溶湯トン当りの総発熱量が/1ail)KceL1
以上の発熱性フラックスを不活性ガスをキャリアガスと
し【導入噴射し、その発熱によって該外殻層内表面を保
温するのである、前記外殻層の−込み温度は、通常鋳鉄
系で/310〜/lI!10℃、鋳鋼系でl参〇〇 −
1110℃である。これらに対応して用いるフラックス
としては、鋳鋼の場合、kl : Jj%−kl、03
: /!%−FeO二j%−Bo :3o%−8102
’ : /り%の組成になる第1図の8
aで示すような性状のフラックスを用い、また鋳鉄には
同図のbで示すような性状のAI:コO%−An20.
: /j%−FeO: 7%−B、O,: 3j%−
51o□:コク%の組成Kかかるものを用いると、必要
な熱量が得られる。The casting method of the present invention is characterized by the fact that the inner shell layer 1ii obtained by centrifugal force casting is
First, a low-melting-point oxidation-preventing flux is injected in a conventional manner to form a coating. And, following the operation, it is an early combustion type that reaches the peak temperature immediately within 3 minutes, and the total calorific value per ton of molten metal is /1ail)KceL1
The above exothermic flux is introduced and injected using an inert gas as a carrier gas, and the heat generated by the flux keeps the inner surface of the outer shell layer warm. /lI! 10℃, cast steel type 〇〇 -
The temperature is 1110°C. In the case of cast steel, the flux used in response to these is kl: Jj%-kl, 03
: /! %-FeO2j%-Bo: 3o%-8102
' : A flux with the properties as shown in 8a in Figure 1, which has a composition of /%, is used, and for cast iron, a flux with properties as shown in b in the figure is used.
: /j%-FeO: 7%-B, O,: 3j%-
51o□: Composition K of body % If such a composition is used, the necessary amount of heat can be obtained.
ただ、上記のフラックスは4〜10分位で発熱量が降下
するので繰返し使う必要がある。大体、外殻層鋳造後に
内層材溶湯を注入するまでの平均時間は約/j分である
から、一般には1回だけの導入では不十分になる。各回
のフラックス投大量としては1.0〜z、okl’2(
外殻層内表面積当り)票
である。However, since the heat value of the above flux decreases after about 4 to 10 minutes, it is necessary to use it repeatedly. Generally speaking, the average time until the molten inner layer material is injected after casting the outer shell layer is approximately /j minutes, so in general, introduction only once is insufficient. The amount of flux thrown each time is 1.0~z,okl'2(
(per inner surface area of the outer shell layer).
次にこの発明の実施例について説明する。Next, embodiments of this invention will be described.
外殻層材アダマイト材(C=八へ3%、Si0.10%
、N1=0.9j%、 Cr = /、0!r%1M0
=0.30%)をlダ!θ℃にて遠心鋳造金型に注湯し
て外殻層を生成させたあと、40秒以内に通常の酸化防
止用フラックスを吹込み、その直後発熱性フラックス(
*I = 、yr%、 Aj20. = /j%、 F
eO: 3% 、BO=30 % 、8i0=/7%
)を コej 惇に223
2 mの甘を第1図
で示すような間隔で投入した。この例では、通常内層材
注湯までの待時間が/41分のロール(外殻層量=コj
ton )のものであるが、これを本発明に適合させ
るため待時間を30分としたが、鋳かけをするのに十分
な高温が保持できたので外殻層と内層の溶着は充分であ
った。Outer shell layer material Adamite material (C=8 to 3%, Si0.10%
, N1=0.9j%, Cr=/,0! r%1M0
= 0.30%)! After pouring the metal into a centrifugal casting mold at θ℃ to form an outer shell layer, normal oxidation-preventing flux is injected within 40 seconds, and immediately after that, exothermic flux (
*I = , yr%, Aj20. = /j%, F
eO: 3%, BO=30%, 8i0=/7%
) to koej atuni 223
2 m of sweet potatoes were added at intervals as shown in Figure 1. In this example, the waiting time before pouring the inner layer material is /41 minutes (outer shell layer amount = coj
ton), but in order to adapt it to the present invention, the waiting time was set to 30 minutes, but the welding of the outer shell layer and inner layer was sufficient because the temperature was maintained high enough for casting. Ta.
しかも、内層材注湯時の外殻層鋳造後はAj @電(外
殻層厚: tOvan ) K違していることが判り外
殻層が指向性凝固となっていた。Furthermore, after casting the outer shell layer when pouring the inner layer material, it was found that Aj @ electric (outer shell layer thickness: tOvan ) K was different, and the outer shell layer was directional solidified.
以上説明したように本発明によれば、内層材注湯までの
時間を長くすることができるので鋳造作業を無理のない
ものにすることができる。しかも、外殻層の指向性凝固
が達成されるので、内層との境界付近における偏析防止
に有効で結合性に優れ、健全な内部性状をもつ輪状鋳物
が得られる。As explained above, according to the present invention, it is possible to lengthen the time until the inner layer material is poured, so that the casting work can be carried out without difficulty. Moreover, since directional solidification of the outer shell layer is achieved, a ring-shaped casting can be obtained which is effective in preventing segregation near the boundary with the inner layer, has excellent bonding properties, and has sound internal properties.
第1図は発熱性フラックスの発熱温度特性図、第1図は
フラックスを繰返し噴入させたときの外殻層内面温度推
移のグラフである。
特許出願人 川崎製鉄株式会社
第1図
峰遁時聞(今)″
第2図
#kMLgItl!1JIIC今フFIG. 1 is a diagram of heat generation temperature characteristics of exothermic flux, and FIG. 1 is a graph of changes in temperature inside the outer shell layer when flux is repeatedly injected. Patent Applicant: Kawasaki Steel Corporation Figure 1: Mine Time (Now)'' Figure 2: #kMLgItl!1JIIC Now
Claims (1)
内部に異積金属の内層材を注湯し合体させて輪状鋳物を
製造するに当たり、上記内層材の注湯に先立ち、前記外
殻層内面に低融点フラックスを複酸させてから、不活性
ガスを介して早期燃焼型の高発熱性7ラツクスを/ない
しは複数回に分けて噴射導入するととKより、核外殻層
内面を保温しておくことを特徴とする輪状鋳物の鋳造方
法。t After casting a cylindrical shell-shaped outer shell layer by centrifugal force casting, an inner layer material of a heterogeneous metal is poured into the shell layer and combined to produce a ring-shaped casting. If a low melting point flux is applied to the inner surface of the nuclear shell layer and then an early combustion type high exothermic 7 lux is injected into the inner surface of the nuclear shell layer via an inert gas, the inner surface of the nuclear outer shell layer will be A method of casting ring-shaped castings characterized by keeping them warm.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21353181A JPS58116967A (en) | 1981-12-28 | 1981-12-28 | Casting method of shaftlike casting |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21353181A JPS58116967A (en) | 1981-12-28 | 1981-12-28 | Casting method of shaftlike casting |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS58116967A true JPS58116967A (en) | 1983-07-12 |
Family
ID=16640727
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21353181A Pending JPS58116967A (en) | 1981-12-28 | 1981-12-28 | Casting method of shaftlike casting |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58116967A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6171163A (en) * | 1984-09-17 | 1986-04-12 | Mitsubishi Heavy Ind Ltd | Centrifugal casting method for double layers |
KR100530082B1 (en) * | 2002-12-13 | 2005-11-22 | 주식회사 포스코 | Method for Adding Tundish-Flux in Tundish |
CN106825509A (en) * | 2016-12-30 | 2017-06-13 | 中钢集团邢台机械轧辊有限公司 | The preparation method of heavy plate mill four-roller roughing high chrome working roll binder course |
-
1981
- 1981-12-28 JP JP21353181A patent/JPS58116967A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6171163A (en) * | 1984-09-17 | 1986-04-12 | Mitsubishi Heavy Ind Ltd | Centrifugal casting method for double layers |
JPH0521666B2 (en) * | 1984-09-17 | 1993-03-25 | Mitsubishi Heavy Ind Ltd | |
KR100530082B1 (en) * | 2002-12-13 | 2005-11-22 | 주식회사 포스코 | Method for Adding Tundish-Flux in Tundish |
CN106825509A (en) * | 2016-12-30 | 2017-06-13 | 中钢集团邢台机械轧辊有限公司 | The preparation method of heavy plate mill four-roller roughing high chrome working roll binder course |
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