JPS63194840A - Casting method for two layer stainless casting steel product - Google Patents
Casting method for two layer stainless casting steel productInfo
- Publication number
- JPS63194840A JPS63194840A JP2587887A JP2587887A JPS63194840A JP S63194840 A JPS63194840 A JP S63194840A JP 2587887 A JP2587887 A JP 2587887A JP 2587887 A JP2587887 A JP 2587887A JP S63194840 A JPS63194840 A JP S63194840A
- Authority
- JP
- Japan
- Prior art keywords
- casting
- layer stainless
- shell mold
- mold
- stainless steel
- 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
- 238000005266 casting Methods 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 11
- 239000010959 steel Substances 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims description 18
- 239000000919 ceramic Substances 0.000 claims abstract description 22
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 22
- 239000010935 stainless steel Substances 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 abstract description 15
- 239000004576 sand Substances 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 229910001208 Crucible steel Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は二層ステンレス鋳鋼品の鋳造方法に係り、特に
割れを効果的に防止し得るものに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for casting double-layered stainless steel castings, and particularly to a method that can effectively prevent cracking.
［従来の技術］
従来の二層ステンレス鋳鋼品の鋳造にあっては、はとん
どの場合常温の砂型鋳型が使用されており、例外的な精
密鋳造の場合のみ高温のセラミック・シェル鋳型が採用
されている。これら常温の砂型鋳型及び高温のセラミッ
ク・シェル鋳型の場合はいずれも常温までの冷却は自然
冷却となっている。[Conventional technology] In conventional casting of double-walled stainless steel products, room temperature sand molds are used in most cases, and high temperature ceramic shell molds are used only in exceptional precision castings. has been done. In the case of these normal temperature sand molds and high temperature ceramic shell molds, cooling to room temperature is natural cooling.
［発明が解決しようとする問題点］
二層ステンレス鋳鋼品（特にＮ、Ｃｒ 、Ｃｕ等強化元
素を添加した二層ステンレス鋳鋼品）は、特定温度域（
一般に５００〜８５０℃の範囲）を徐冷すると析出脆化
して「割れ」が発生する恐れがあり、このような割れが
発生した場合には鋳鋼品を廃棄したりあるいは多大な補
修工数を要することとなる。そこでこのような析出・脆
化を防止するために特定温度域を急冷することが考えら
れるが、常温鋳型の場合薄肉部が特定（脆化）濃度域に
なっても押湯等厚肉部は未凝固の状態にあり、水冷等は
危険で実施できなかった。又鋳造品は大きく厚い鋳型に
包み込まれているため急冷そのものが困難であった。あ
るいは薄肉部品の場合は急冷するまえに脆化温度域に゛
なってしまったりするという問題があった。[Problems to be Solved by the Invention] Two-layer stainless steel casting products (particularly two-layer stainless steel casting products to which reinforcing elements such as N, Cr, and Cu have been added) cannot be used in a specific temperature range (
Slow cooling (generally in the range of 500 to 850°C) may lead to precipitation embrittlement and "cracks", and if such cracks occur, the cast steel product may have to be discarded or a large amount of repair work will be required. becomes. Therefore, in order to prevent such precipitation and embrittlement, rapid cooling in a specific temperature range may be considered, but in the case of room-temperature molds, even if the thin-walled part reaches a specific (embrittlement) concentration range, thick-walled parts such as the riser It was in an unsolidified state, and water cooling was dangerous and could not be carried out. Furthermore, since the cast product is enclosed in a large and thick mold, rapid cooling itself is difficult. Furthermore, in the case of thin-walled parts, there is a problem that the temperature reaches the brittle temperature range before quenching.
本発明はこのような点に基づいてなされたものでその目
的とするところは、析出脆化、それによる割れの発生を
防止することが可能な二層ステンレス鋳鋼品の鋳造方法
を提供することにある。The present invention has been made based on the above points, and its purpose is to provide a method for casting double-layer stainless steel castings that can prevent precipitation embrittlement and the occurrence of cracks caused by it. be.
［問題点を解決するための手段］
すなわち本発明による二層ステンレス鋳鋼品の鋳造方法
は、セラミック・シェル鋳型を材質によって決定される
特定温度以下に加熱・保温する工程と、この加熱・保温
されたセラミック・シェル鋳型内に二層ステンレス溶鋼
を鋳込む工程と、鋳込んだ二層ステンレス溶鋼のどの部
分も特定温度以上に保持された状態で凝固が完全に完了
するまで放置する工程と、その後セラミック・シェル鋳
型ごと取出して急冷する工程とを具備したことを特徴と
するものである。[Means for Solving the Problems] In other words, the method for casting double-layer stainless steel castings according to the present invention includes the steps of heating and keeping a ceramic shell mold below a specific temperature determined by the material, and A process of casting two-layer stainless steel molten steel into a ceramic shell mold, a process of leaving any part of the cast two-layer stainless steel molten steel at a temperature above a certain temperature until solidification is completely completed, and then This method is characterized by comprising a step of taking out the whole ceramic shell mold and rapidly cooling it.
［作用］
つまりセラミック・シェル鋳型を材質によって決定され
る特定温度以上（析出・脆化が始まる温度以上）に加熱
保持し、その状態で二層ステンレス溶鋼を鋳込み、鋳込
むんだ後一定時間放置して鋳造品全体の温度差を均一化
させる。その際特定温度以上に保持する。その後特定温
度以上の状態から急冷するものである。それによって析
出脆化域にて析出・論比させることなく通過させ、それ
によって割れの発生を防止せんとする。[Operation] In other words, the ceramic shell mold is heated and maintained at a certain temperature determined by the material (above the temperature at which precipitation and embrittlement begin), and in that state, two-layer stainless steel is poured in. After being cast, it is left for a certain period of time. to equalize the temperature difference throughout the casting. At that time, maintain the temperature above a certain level. After that, it is rapidly cooled from a state above a specific temperature. This allows the metal to pass through the precipitation embrittlement area without precipitation and oxidation, thereby preventing the occurrence of cracks.
［実施例］
以下第１図乃至第３図を参照して本発明の一実施例を説
明する。第１図乃至第３図は本実施例による二層ステン
レス鋳鋼品の鋳造方法を工程順に示したものであり、以
下順次説明する。[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIGS. 1 to 3 show the casting method for a double-layered stainless steel casting product according to this embodiment in the order of steps, and will be explained in sequence below.
■まず第１図に示すように、セラミック・シェル鋳型１
を加熱炉２内に搬入して、特定温度（例えば１０００℃
）に加熱する。上記加熱炉２内には加熱用ヒータ３が配
置されている。また上記加熱炉２内にあってセラミック
・シェル鋳型１はバックアップサンド４内に配置されて
いる。このようにバックアップサンド４を配置するのは
、加熱炉２内から取出す場合にセラミック・シェル鋳型
１の全体温度を均一化することができるからである。尚
図中符号５はバックアップサンド４を収容する容器であ
る。■First, as shown in Figure 1, ceramic shell mold 1
is carried into the heating furnace 2 and heated to a specific temperature (for example, 1000°C).
). A heating heater 3 is disposed within the heating furnace 2 . Further, within the heating furnace 2, the ceramic shell mold 1 is placed in a backup sand 4. The reason why the backup sand 4 is arranged in this way is that the entire temperature of the ceramic shell mold 1 can be made uniform when it is taken out from the heating furnace 2. In addition, the reference numeral 5 in the figure is a container that accommodates the backup sand 4.
■次に第２図に示すように特定温度以上に加熱されたセ
ラミックシェル鋳型１をバックアップサンド４内に収容
した状態で加熱炉２内から引出して、二層ステンレス溶
鋼６を鋳込む。尚図中符号７は二層ステンレス溶ｒＡ６
を収容している容器である。(2) Next, as shown in FIG. 2, the ceramic shell mold 1 heated to a specific temperature or above is pulled out from the heating furnace 2 while being accommodated in the backup sand 4, and the two-layer stainless steel molten steel 6 is cast therein. In addition, code 7 in the figure is double-layer stainless steel melt rA6.
It is a container that contains.
■そして二層ステンレス溶鋼６を鋳込んだ後しばらく放
置する。そして押湯等が完全に凝固したことを確認した
後セラミック・シェル鋳型１を取出す。尚その際鋳型温
度は特定温度以上に保持されている。そして必要な場合
には図示しないハンマ等によってセラミック・シェル鋳
型１を除去して、第３図に示すように水冷する。図中符
＠７は容器であり、この容器７内に冷却用の水８が収容
されている。尚図中符号９は治具である。(2) Then, after pouring the two-layer stainless steel molten steel 6, it is left for a while. After confirming that the riser etc. have completely solidified, the ceramic shell mold 1 is taken out. In this case, the mold temperature is maintained at a specific temperature or higher. Then, if necessary, the ceramic shell mold 1 is removed using a hammer or the like (not shown) and cooled with water as shown in FIG. The symbol @7 in the figure is a container, and cooling water 8 is contained in the container 7. Note that the reference numeral 9 in the figure is a jig.
以上本実施例によると以下のような効果を奏することが
できる。According to this embodiment, the following effects can be achieved.
■まず特定温度以上すなわち析出脆化が始まる温度以上
に加熱保持されたセラミック・シェル鋳型１内に二層ス
テンレス溶鋼６を鋳込むようにしているので、どんな薄
肉部であっても特定温度以下に冷却されることはなく、
よって全体が凝固完了するまで待つことができる。そし
てその状態から析出脆化温度域を効果的に急冷する。し
たがって析出脆化域にあって析出脆化させることなく通
過させることができ、よってＮ、Ｃｒ１及びＣＵなどを
添加した強化二層ステンレス鋼であっても析出脆化せず
、延征及び初生を損うことなく製造することができる。■First, the two-layer stainless steel molten steel 6 is poured into the ceramic shell mold 1, which is heated and maintained above a certain temperature, that is, above the temperature at which precipitation embrittlement begins, so that no matter how thin the part is, it is cooled to below a certain temperature. There is no problem,
Therefore, it is possible to wait until the entire solidification is completed. Then, from this state, the precipitation embrittlement temperature range is effectively quenched. Therefore, it can pass through the precipitation embrittlement region without causing precipitation embrittlement, and therefore, even if it is a reinforced double-layer stainless steel with additions of N, Cr1, CU, etc., precipitation embrittlement will not occur, and the extension and initial growth will be prevented. It can be manufactured without damage.
したがって従来懸念されていた二層ステンレス鋳鋼品に
発生する割れを効果的に防止することができ、品質の高
い鋳鋼品を製造することができる。Therefore, it is possible to effectively prevent cracks that occur in double-layer stainless steel cast products, which have been a concern in the past, and high quality cast steel products can be manufactured.
■またセラミック・シェル鋳型１の除去は極めて簡単で
あり、よって容易に急冷工程を開始することができる。(2) Moreover, the removal of the ceramic shell mold 1 is extremely easy, and therefore the quenching process can be started easily.
［発明の効果］
以上詳述したように本発明による二層ステンレス鋳鋼品
の鋳造方法によると、割れの発生を確実に防止すること
ができ、品質のよい鋳鋼品を製造することができる等そ
の効果は大である。[Effects of the Invention] As detailed above, according to the method for casting double-layered stainless steel cast products according to the present invention, it is possible to reliably prevent the occurrence of cracks, and it is possible to manufacture high-quality cast steel products. The effect is great.
第１図乃至第３図は本発明の一実施例による鋳造方法を
工程順に示す図である。
１・・・セラミック・シェル鋳型、２・・・加熱炉、３
・・・加熱用ヒータ、４・・・バックアップサンド、５
・・・容器、６・・・二層ステンレス溶鋼、７・・・容
器、８・・・水、９・・・治具。1 to 3 are diagrams illustrating a casting method according to an embodiment of the present invention in the order of steps. 1...Ceramic shell mold, 2...Heating furnace, 3
...Heating heater, 4...Backup sandwich, 5
... Container, 6... Double layer stainless steel molten steel, 7... Container, 8... Water, 9... Jig.
Claims (1)
温度以上に加熱・保温する工程と、この加熱・保温され
たセラミック・シェル鋳型内に二層ステンレス溶鋼を鋳
込む工程と、鋳込んだ二層ステンレス溶鋼のどの部分も
特定温度以上に保持された状態で凝固が完全に完了する
まで放置する工程と、その後セラミック・シェル鋳型ご
と取出して急冷する工程とを具備したことを特徴とする
二層ステンレス鋳鋼品の鋳造方法。A process of heating and keeping the ceramic shell mold above a specific temperature determined by the material, a process of casting two-layer stainless steel molten steel into the heated and kept warm ceramic shell mold, and a process of pouring the two-layer stainless steel molten steel into the heated and kept warm ceramic shell mold. A double-layered stainless steel casting product characterized by comprising a process of leaving all parts of the throat above a certain temperature until solidification is completely completed, and then a process of taking out the entire ceramic shell mold and rapidly cooling it. casting method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2587887A JPS63194840A (en) | 1987-02-06 | 1987-02-06 | Casting method for two layer stainless casting steel product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2587887A JPS63194840A (en) | 1987-02-06 | 1987-02-06 | Casting method for two layer stainless casting steel product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63194840A true JPS63194840A (en) | 1988-08-12 |
Family
ID=12178042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2587887A Pending JPS63194840A (en) | 1987-02-06 | 1987-02-06 | Casting method for two layer stainless casting steel product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63194840A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009050917A (en) * | 2008-11-04 | 2009-03-12 | Komatsu Igata Seisakusho:Kk | Gypsum mold |
| US8708327B2 (en) | 2008-01-18 | 2014-04-29 | Glory Ltd. | Paper sheet handling machine |
| CN103934416A (en) * | 2014-04-11 | 2014-07-23 | 安徽霍山科皖特种铸造有限责任公司 | Method for producing precise stainless steel casting by sodium silicate shell making |
| CN110938731A (en) * | 2019-12-24 | 2020-03-31 | 陕西宏远航空锻造有限责任公司 | Method for improving rust resistance of investment casting austenitic stainless steel |
-
1987
- 1987-02-06 JP JP2587887A patent/JPS63194840A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8708327B2 (en) | 2008-01-18 | 2014-04-29 | Glory Ltd. | Paper sheet handling machine |
| JP2009050917A (en) * | 2008-11-04 | 2009-03-12 | Komatsu Igata Seisakusho:Kk | Gypsum mold |
| CN103934416A (en) * | 2014-04-11 | 2014-07-23 | 安徽霍山科皖特种铸造有限责任公司 | Method for producing precise stainless steel casting by sodium silicate shell making |
| CN103934416B (en) * | 2014-04-11 | 2016-02-03 | 安徽霍山科皖特种铸造有限责任公司 | A kind of waterglass shell produces the method for precision stainless steel foundry goods |
| CN110938731A (en) * | 2019-12-24 | 2020-03-31 | 陕西宏远航空锻造有限责任公司 | Method for improving rust resistance of investment casting austenitic stainless steel |
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