JPH0929421A - Production of stainless steel-made thin parts - Google Patents
Production of stainless steel-made thin partsInfo
- Publication number
- JPH0929421A JPH0929421A JP7181531A JP18153195A JPH0929421A JP H0929421 A JPH0929421 A JP H0929421A JP 7181531 A JP7181531 A JP 7181531A JP 18153195 A JP18153195 A JP 18153195A JP H0929421 A JPH0929421 A JP H0929421A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- product
- thin
- shell
- 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.)
- Pending
Links
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、船外機用プロペラ
等のステンレス製薄肉部品の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a thin stainless steel component such as a propeller for an outboard motor.
【０００２】[0002]
【従来の技術】例えば、船外機用のステンレス製プロペ
ラやウォータービークル用のステンレス製インペラ等の
薄肉部品は鋳造によって成形されるが、鋳造法としては
専らロストワックス法が用いられていた。2. Description of the Related Art For example, thin-walled parts such as stainless steel propellers for outboard motors and stainless steel impellers for water vehicles are molded by casting, and the lost wax method is exclusively used as the casting method.
【０００３】上記ロストワックス法は、ろう（ワック
ス）を金型に流し込んで消耗性模型（ろう型）を作り、
この模型にジルコン砂や石英粉及びエチルシリケート溶
液でコーティングを施した後、これに砂を振り掛けて耐
火層を形成し、更に模型を耐火材中に数回埋没させて耐
火物の厚いシェル状の型を作り、このようにして得られ
た型を炉中に入れて加熱することによってろうを流し出
し、その後の空所に湯を流し込んで所望の形状及び寸法
の部品を得る鋳造方法である。In the lost wax method, wax (wax) is poured into a mold to make a consumable model (wax mold).
After coating this model with zircon sand, quartz powder and ethyl silicate solution, sprinkle sand on it to form a refractory layer, and further immerse the model in refractory material several times to form a thick shell of refractory material. This is a casting method in which a mold is made, the mold thus obtained is put into a furnace and heated so that the wax is poured out, and then hot water is poured into a space thereafter to obtain a part having a desired shape and size.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記ロ
ストワックス法においては、図２（ａ）に示すように、
ワックス成形→ワックス組立→鋳型造形（６回）→脱ろ
う→焼成→鋳造→型ばらしという多くの工程を経なけれ
ばならないために多大な工数と時間及びコストを要する
他、型ばらしが容易でないという問題があった。However, in the above lost wax method, as shown in FIG. 2 (a),
Wax molding-> wax assembly-> molding (6 times)->dewaxing->firing->casting-> mold release requires a lot of man-hours, time, and cost, and mold release is not easy. There was a problem.
【０００５】又、ロストワックス法においては、鋳型が
極めて密であり、良好な湯流れを確保するために高温
（１７００℃以上）の湯を鋳型に流し込む必要からガス
が発生し易く、鋳巣等の鋳造欠陥が発し易いという問題
もあった。Further, in the lost wax method, the mold is extremely dense, and it is necessary to pour hot water (1700 ° C. or higher) into the mold in order to ensure a good flow of the molten metal, so that gas is easily generated, and a porosity or the like is generated. There is also a problem that the casting defect of (3) is likely to occur.
【０００６】他方、従来のシェル鋳造法によってステン
レス製部品を成形すると、製品の表面にシェルの砂が溶
け込むために鋳肌が荒れ、商品性が劣るという問題が発
生する。On the other hand, when a stainless steel part is formed by the conventional shell casting method, the sand of the shell is melted into the surface of the product, so that the casting surface is rough and the commercial property is deteriorated.
【０００７】本発明は上記問題に鑑みてなされたもの
で、その目的とする処は、工程及び工数を削減して生産
性向上を図るとともに、製品の薄肉化による軽量化と鋳
肌の改善及び鋳造欠陥の発生防止等を図ることができる
ステンレス製薄肉部品の製造方法を提供することにあ
る。The present invention has been made in view of the above problems, and an object of the present invention is to reduce the number of steps and man-hours to improve the productivity, and to reduce the weight and casting surface by reducing the product thickness. It is an object of the present invention to provide a method for manufacturing a thin-walled stainless steel component capable of preventing the occurrence of casting defects.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するた
め、請求項１記載の発明は、所定量のＳｉを含有し、溶
解温度が１４００℃〜１７００℃であるステンレス材料
を用いたシェル鋳造法によって薄肉部品を成形すること
を特徴とする。To achieve the above object, the invention according to claim 1 is a shell casting method using a stainless material containing a predetermined amount of Si and having a melting temperature of 1400 ° C to 1700 ° C. It is characterized in that a thin-walled part is molded by.
【０００９】請求項２記載の発明は、請求項１記載の発
明において、前記ステンレス材料はＣ，Ｓｉ，Ｍｎ，
Ｐ，Ｓ，Ｍｏ，Ｎｉ，Ｃｒの各元素を以下の割合； Ｃ：0.01％〜 0.08 ％ Ｓｉ：0.01％〜 5.00 ％ Ｍｎ：0.05％〜 2.00 ％ Ｐ：0.01％〜 0.45 ％ Ｓ：0.01％〜 0.03 ％ Ｍｏ：1.00％〜 3.00 ％ Ｎｉ：3.00％〜 10.50％ Ｃｒ：12.00 ％〜 28.00％ で含有するものとしたことを特徴とする。According to a second aspect of the present invention, in the first aspect of the invention, the stainless steel material is C, Si, Mn,
The following ratios of P, S, Mo, Ni, and Cr elements; C: 0.01% to 0.08% Si: 0.01% to 5.00% Mn: 0.05% to 2.00% P: 0.01% to 0.45% S: 0.01% to 0.03% Mo: 1.00% to 3.00% Ni: 3.00% to 10.50% Cr: 12.00% to 28.00%.
【００１０】請求項３記載の発明は、請求項１又は２記
載の発明において、前記薄肉部品を、一端で接続された
内筒部と外筒部とで構成される内外二重筒構造を有する
ものとしたことを特徴とする。According to a third aspect of the present invention, in the first or second aspect of the present invention, the thin-walled component has an inner-outer double tube structure composed of an inner tube portion and an outer tube portion connected at one end. It is characterized by having been made.
【００１１】請求項４記載の発明は、請求項３記載の発
明において、前記薄肉部品をプロペラ又はインペラとし
たことを特徴とする。According to a fourth aspect of the present invention, in the third aspect of the invention, the thin-walled component is a propeller or an impeller.
【００１２】従って、本発明によれば、ロストワックス
法に比して工程が格段に少ないシェル鋳造法が用いられ
るため、工程及び工数が著しく削減されて生産性向上が
図られる。又、ステンレス材料の溶解温度が従来のそれ
よりも低いためにガスの発生が少なく、しかも発生した
ガスはシェルを通過して排出されるため、製品に鋳巣等
の鋳造欠陥が発生せず、製品の切削性が高められる。そ
して、湯の温度が低いためにシェルの砂が製品の表面に
溶け込んで鋳肌を荒らすことがなく、極めて良好な鋳肌
が得られる。更に、ステンレス材料は溶解温度が低くて
も良好な湯流れを示すため、ガスの発生が少ないことと
も相俟って製品の薄肉化とこれに伴う軽量化が図られ
る。Therefore, according to the present invention, since the shell casting method, which has significantly fewer steps than the lost wax method, is used, the steps and man-hours are remarkably reduced and the productivity is improved. Further, since the melting temperature of the stainless steel material is lower than that of the conventional one, less gas is generated, and since the generated gas is discharged through the shell, casting defects such as porosity do not occur in the product, The machinability of the product is improved. Further, since the temperature of the hot water is low, the sand of the shell does not melt into the surface of the product to roughen the casting surface, and an extremely good casting surface can be obtained. Further, since the stainless steel material exhibits a good molten metal flow even if the melting temperature is low, the thinness of the product and the accompanying weight reduction can be achieved in combination with the less gas generation.
【００１３】[0013]
【発明の実施の形態】以下に本発明の実施の形態を添付
図面に基づいて説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１４】図１は本発明に係る製造方法をその工程順
に示す断面図であり、以下、シェル鋳造法によって船外
機用のステンレス製プロペラを製造する方法を説明す
る。FIG. 1 is a cross-sectional view showing a manufacturing method according to the present invention in the order of steps. Hereinafter, a method for manufacturing a stainless steel propeller for an outboard motor by a shell casting method will be described.
【００１５】先ず、図１（ａ）に示すようにシェル鋳型
１を湯口型１ａと上型１ｂ及び下型１ｃに３分割して成
形する。First, as shown in FIG. 1 (a), a shell mold 1 is divided into three parts into a sprue mold 1a, an upper mold 1b and a lower mold 1c.
【００１６】ここで、各鋳型１ａ，１ｂ，１ｃの成形は
次のようになされる。即ち、所定温度に加熱された金型
にバインダーとしてのフェノール樹脂等を混ぜた鋳物砂
を掛けると、樹脂であるバインダーが溶融して樹脂粘結
砂の薄いシェルが金型の表面に形成され、これを金型と
共に炉中に入れて焼成することによって所望の各鋳型１
ａ，１ｂ，１ｃが成形される。Here, the molding of each mold 1a, 1b, 1c is performed as follows. That is, when a molding sand mixed with a phenol resin or the like as a binder is hung on a mold heated to a predetermined temperature, a binder as a resin is melted to form a thin shell of resin caking sand on the surface of the mold, This is put in a furnace together with a mold and fired to obtain each desired mold 1.
a, 1b, 1c are molded.
【００１７】次に、図１（ｂ）に示すよう各鋳型１ａ，
１ｂ，１ｃを組み付けてこれらを接着すると、シェル鋳
型１の内部には製品であるプロペラの形状に合致する空
洞Ｓが形成され、図１（ｃ）に示すように、空洞Ｓにス
テンレス材料を溶解させた湯２を湯口から注入する。Next, as shown in FIG. 1 (b), each mold 1a,
When 1b and 1c are assembled and bonded to each other, a cavity S conforming to the shape of the propeller as a product is formed inside the shell mold 1, and the stainless material is melted in the cavity S as shown in FIG. 1 (c). Pour hot water 2 from the sprue.
【００１８】ここで、ステンレス材料としてはＣ，Ｓ
ｉ，Ｍｎ，Ｐ，Ｓ，Ｍｏ，Ｎｉ，Ｃｒの各元素を下表の
割合で含有するシリコロイ（登録商標）が使用される。Here, as the stainless steel material, C and S are used.
Silicolloy (registered trademark) containing each element of i, Mn, P, S, Mo, Ni and Cr in the ratios shown in the table below is used.
【００１９】[0019]
【表１】 而して、上表に示す組成を有するステンレス材料の溶解
温度は１４００℃〜１７００℃と従来使用されていたス
テンレス材料の溶解温度（１７００℃以上）よりも低い
値を示す。[Table 1] Thus, the melting temperature of the stainless steel material having the composition shown in the above table is 1400 ° C. to 1700 ° C., which is lower than the melting temperature (1700 ° C. or higher) of the conventionally used stainless steel material.
【００２０】図１（ｃ）に示す状態において湯２が冷却
によって凝固すると、図１（ｄ）に示すようにシェル鋳
型１を除去するが、シェル鋳型１は注湯によって熱分解
するため、これの除去（鋳砂ばらし）は非常に容易に行
われる。そして、最後に余分な湯口部分３を切断して除
去すれば、図１（ｅ）に示すステンレス製プロペラ（素
材）４が得られる。When the hot water 2 solidifies by cooling in the state shown in FIG. 1 (c), the shell mold 1 is removed as shown in FIG. 1 (d). Is very easily removed (cast sand removal). Finally, by cutting and removing the excess sprue part 3, the stainless steel propeller (material) 4 shown in FIG. 1 (e) is obtained.
【００２１】而して、以上説明したシェル鋳造法の工程
をロストワックス法と対比して図２（ｂ）に示すが、こ
のシェル鋳造法はロストワックス法に比してその工程数
が格段に少なく、従って、工数の削減による生産性の向
上とコストダウンを図ることができる。The process of the shell casting method described above is shown in FIG. 2B in comparison with the lost wax method. This shell casting method has a significantly greater number of steps than the lost wax method. Therefore, it is possible to improve productivity and reduce costs by reducing the number of steps.
【００２２】又、前述のように本発明方法において使用
されるステンレス材料の溶解温度は１４００℃〜１７０
０℃と従来のそれよりも低いために鋳造時のガスの発生
が少なく、しかも発生したガスはシェル鋳型１を通過し
て外部に排出されるため、製品４に鋳巣等の鋳造欠陥が
発生せず、製品４の切削性が高められてバイト等の工具
の耐久性向上が図られる。そして、湯２の温度が低いた
めにシェル鋳型１の砂が製品４の表面に溶け込んで鋳肌
を荒らすことがなく、極めて良好な鋳肌が得られ、製品
成形後の表面加工が不要となる。As described above, the melting temperature of the stainless material used in the method of the present invention is 1400 ° C to 170 ° C.
Since the temperature is 0 ° C, which is lower than that of the conventional one, less gas is generated during casting, and the generated gas passes through the shell mold 1 and is discharged to the outside, so that casting defects such as cavities occur in the product 4. Instead, the machinability of the product 4 is improved, and the durability of tools such as a cutting tool is improved. And since the temperature of the hot water 2 is low, the sand of the shell mold 1 does not melt into the surface of the product 4 to roughen the casting surface, an extremely good casting surface is obtained, and the surface processing after the product molding is unnecessary. .
【００２３】更に、本発明方法に使用されるステンレス
材料は溶解温度が低くても良好な湯流れを示すため、ガ
スの発生が少ないこととも相挨て製品４の薄肉化とこれ
に伴う軽量化が可能となり、本実施の形態のように製品
４がプロペラである場合には、軽量化によって慣性が小
さく抑えられるために回転応答性が改善されるととも
に、軸部の強度及び信頼性が高められる。Further, since the stainless steel material used in the method of the present invention exhibits a good molten metal flow even if the melting temperature is low, the gas generation is small and the product 4 becomes thin and the weight thereof is reduced accordingly. When the product 4 is a propeller as in the present embodiment, the inertia is suppressed to be small due to the weight reduction, so that the rotational response is improved and the strength and reliability of the shaft portion are improved. .
【００２４】ここで、本発明方法に用いられるシェル鋳
造法と従来のロストワックス法によって製造されたウォ
ータービークル用のステンレス製インペラ５，１５を図
３、図４にそれぞれ示す。両インペラ５，１５はそれぞ
れ内筒部５ａ，１５ａと外筒部５ｂ，１５ｂとで構成さ
れる内外二重筒構造を有するが、内筒部５ａ，１５ａと
外筒部５ｂ，１５ｂとは一端で接続されている。Here, the stainless steel impellers 5 and 15 for water vehicles manufactured by the shell casting method used in the method of the present invention and the conventional lost wax method are shown in FIGS. 3 and 4, respectively. Both impellers 5 and 15 have an inner-outer double cylinder structure composed of inner cylinders 5a and 15a and outer cylinders 5b and 15b, respectively, but the inner cylinders 5a and 15a and the outer cylinders 5b and 15b are Connected by.
【００２５】而して、本発明方法によって得られたイン
ペラ５においては特に外筒部５ｂの肉厚を薄くすること
ができ、全体的に軽量化が可能となる。これに対して従
来のロストワックス法によって得られたインペラ１５に
あっては、外筒部分１５ｂの肉厚が厚くなるために全体
の重量が大きくなり、回転応答性や内筒部１５ａの強度
及び信頼性に関して不利となる。Thus, in the impeller 5 obtained by the method of the present invention, the wall thickness of the outer cylinder portion 5b can be particularly reduced, and the overall weight can be reduced. On the other hand, in the impeller 15 obtained by the conventional lost wax method, since the outer cylinder portion 15b becomes thicker, the overall weight becomes larger, and the rotation response and the strength of the inner cylinder portion 15a are reduced. There is a disadvantage in terms of reliability.
【００２６】尚、本実施の形態では本発明方法を特にプ
ロペラやインペラに適用した例について述べたが、本発
明方法はその他任意のステンレス製薄肉部品の製造に対
して同様に適用し得ることは勿論である。In this embodiment, an example in which the method of the present invention is applied to a propeller or an impeller has been described. However, the method of the present invention can be similarly applied to the production of any other thin stainless steel parts. Of course.
【００２７】[0027]
【発明の効果】以上の説明で明らかなように、本発明に
よれば、所定量のＳｉを含有し、溶解温度が１４００℃
〜１７００℃であるステンレス材料を用いたシェル鋳造
法によって薄肉部品を成形するようにしたため、工程及
び工数を削減して生産性向上を図るとともに、製品の薄
肉化による軽量化と鋳肌の改善及び鋳造欠陥の発生防止
等を図ることができるという効果が得られる。As is apparent from the above description, according to the present invention, a predetermined amount of Si is contained and the melting temperature is 1400 ° C.
Since thin-walled parts are molded by a shell casting method using a stainless steel material of ~ 1700 ° C, the number of steps and man-hours is reduced to improve productivity, and the product is made thinner to reduce weight and improve the casting surface. The effect that the occurrence of casting defects can be prevented can be obtained.
【図１】本発明に係る製造方法をその工程順に示す断面
図である。FIG. 1 is a cross-sectional view showing a manufacturing method according to the present invention in the order of steps thereof.
【図２】本発明方法に使用されるシェル鋳造法の工程を
ロストワックス法との対比において示すブロック図であ
る。FIG. 2 is a block diagram showing the steps of the shell casting method used in the method of the present invention in comparison with the lost wax method.
【図３】本発明方法に係るシェル鋳造法によって製造さ
れたウォータービークル用のステンレス製インペラの断
面図である。FIG. 3 is a sectional view of a stainless steel impeller for a water vehicle manufactured by a shell casting method according to the method of the present invention.
【図４】従来のロストワックス法によって製造されたウ
ォータービークル用のステンレス製インペラの断面図で
ある。FIG. 4 is a sectional view of a stainless steel impeller for a water vehicle manufactured by a conventional lost wax method.
１ シェル鋳型 １ａ 湯口型 １ｂ 上型 １ｃ 下型 ２ 湯 ４ プロペラ（ステンレス製薄肉部品） ５ インペラ（ステンレス製薄肉部品） 1 Shell Mold 1a Gate Type 1b Upper Type 1c Lower Type 2 Hot Water 4 Propeller (Stainless Steel Thin Wall Parts) 5 Impeller (Stainless Steel Thin Wall Parts)
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ２２Ｃ 38/58 Ｂ６３Ｈ 21/26 Ｚ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical indication C22C 38/58 B63H 21/26 Z
Claims (4)
００℃〜１７００℃であるステンレス材料を用いたシェ
ル鋳造法によって薄肉部品を成形することを特徴とする
ステンレス製薄肉部品の製造方法。1. A solution containing a predetermined amount of Si and having a melting temperature of 14
A method of manufacturing a thin-walled part made of stainless steel, which comprises molding the thin-walled part by a shell casting method using a stainless material having a temperature of 00 ° C to 1700 ° C.
Ｐ，Ｓ，Ｍｏ，Ｎｉ，Ｃｒの各元素を以下の割合； Ｃ：0.01％〜 0.08 ％ Ｓｉ：0.01％〜 5.00 ％ Ｍｎ：0.05％〜 2.00 ％ Ｐ：0.01％〜 0.45 ％ Ｓ：0.01％〜 0.03 ％ Ｍｏ：1.00％〜 3.00 ％ Ｎｉ：3.00％〜 10.50％ Ｃｒ：12.00 ％〜 28.00％ で含有することを特徴とする請求項１記載のステンレス
製薄肉部品の製造方法。2. The stainless steel material is C, Si, Mn,
The following ratios of P, S, Mo, Ni, and Cr elements; C: 0.01% to 0.08% Si: 0.01% to 5.00% Mn: 0.05% to 2.00% P: 0.01% to 0.45% S: 0.01% to 0.03% Mo: 1.00% to 3.00% Ni: 3.00% to 10.50% Cr: 12.00% to 28.00% The method for producing a thin stainless steel component according to claim 1, wherein the content is 0.03%.
と外筒部とで構成される内外二重筒構造を有することを
特徴とする請求項１又は２記載のステンレス製薄肉部品
の製造方法。3. The stainless-steel thin-walled component according to claim 1 or 2, wherein the thin-walled component has an inner-outer double-barrel structure including an inner tubular portion and an outer tubular portion connected at one end. Production method.
あることを特徴とする請求項３記載のステンレス製薄肉
部品の製造方法。4. The method for manufacturing a thin-walled part made of stainless steel according to claim 3, wherein the thin-walled part is a propeller or an impeller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7181531A JPH0929421A (en) | 1995-07-18 | 1995-07-18 | Production of stainless steel-made thin parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7181531A JPH0929421A (en) | 1995-07-18 | 1995-07-18 | Production of stainless steel-made thin parts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0929421A true JPH0929421A (en) | 1997-02-04 |
Family
ID=16102407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7181531A Pending JPH0929421A (en) | 1995-07-18 | 1995-07-18 | Production of stainless steel-made thin parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0929421A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005307943A (en) * | 2004-04-26 | 2005-11-04 | Hirotoshi Baba | Impeller |
| CN102019353A (en) * | 2010-12-17 | 2011-04-20 | 西安西工大超晶科技发展有限责任公司 | Precision casting molding method for complex thin-walled member |
| KR101226209B1 (en) * | 2012-04-24 | 2013-01-28 | 박상규 | Mold for maunfacturing stainless steel statues and method for manufacturing stainless steel statues using the same |
| KR20190074531A (en) * | 2017-12-20 | 2019-06-28 | (주)금화인버텍 | Method for Casting |
-
1995
- 1995-07-18 JP JP7181531A patent/JPH0929421A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005307943A (en) * | 2004-04-26 | 2005-11-04 | Hirotoshi Baba | Impeller |
| CN102019353A (en) * | 2010-12-17 | 2011-04-20 | 西安西工大超晶科技发展有限责任公司 | Precision casting molding method for complex thin-walled member |
| KR101226209B1 (en) * | 2012-04-24 | 2013-01-28 | 박상규 | Mold for maunfacturing stainless steel statues and method for manufacturing stainless steel statues using the same |
| KR20190074531A (en) * | 2017-12-20 | 2019-06-28 | (주)금화인버텍 | Method for Casting |
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