JPH0613140B2 - Coating casting method - Google Patents
Coating casting methodInfo
- Publication number
- JPH0613140B2 JPH0613140B2 JP63308554A JP30855488A JPH0613140B2 JP H0613140 B2 JPH0613140 B2 JP H0613140B2 JP 63308554 A JP63308554 A JP 63308554A JP 30855488 A JP30855488 A JP 30855488A JP H0613140 B2 JPH0613140 B2 JP H0613140B2
- Authority
- JP
- Japan
- Prior art keywords
- coating
- flux
- molten
- casting
- casting method
- 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
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は鋳造、鍛造、圧延等による鉄系素材から作られ
た部品の一部に、異種の合金(各種の銅合金、ニッケル
合金、アルミ合金、その他)を被覆鋳造する方法に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a part of a part made of an iron-based material by casting, forging, rolling or the like, in which a different type of alloy (various copper alloys, nickel alloys, aluminum Alloys, etc.) for coating casting.
〔従来の技術〕 従来、被覆鋳造を行う場合は、溶着を確実なものにする
ため、被覆材に５mm又は１０mm以上というようにある程
度の厚み(駄肉)をもたせ、鋳造後、所定の寸法まで切削
加工して仕上げていた。[Prior Art] Conventionally, when performing coating casting, in order to ensure welding, the coating material should have a certain thickness (dumbness) such as 5 mm or 10 mm or more, and after casting, up to a predetermined size It was finished by cutting.
従来の被覆鋳造は被覆厚を薄くできなかったので、厚肉
の場合に生ずる凝固収縮応力による被覆面の剥がれや引
け巣の発生が生じたのである。上記点に鑑み、本発明は
従来の欠点を除去するため、被覆厚を薄くすることので
きる被覆鋳造法を提供することを目的としたものであ
る。Since the conventional coating casting cannot reduce the coating thickness, peeling of the coating surface and shrinkage cavities occur due to the solidification shrinkage stress generated in the case of thick wall. In view of the above points, the present invention aims to provide a coating casting method capable of reducing the coating thickness in order to eliminate the conventional defects.
上記目的を達成するため、本発明は被覆を施そうとする
部品本体とコアーで形成される空腔内に、溶融状態のフ
ラックスを充填し、次に、被覆材の溶湯を鋳入すると同
時に重力倍数５〜１５の遠心力を与え、溶融フラックス
と被覆金属溶湯の比重差を増幅することにより、フラッ
クスと被覆金属溶湯とを置換し、薄肉の被覆鋳造を行う
ことを特徴としたものである。In order to achieve the above object, the present invention fills a molten flux in a cavity formed by a component body and a core to be coated, and then, when pouring a molten material of the coating material, gravity is applied at the same time. By applying a centrifugal force of a multiple of 5 to 15 to amplify the difference in specific gravity between the molten flux and the molten coating metal, the flux is replaced with the molten coating metal, and thin coating casting is performed.
本発明の最大の特徴とするところは、被覆鋳造する部分
の母材とコアー(中子)によって形成された空腔内に、フ
ラックス(硼砂又は硼砂に硼酸を配合した溶媒…配合比
により溶融点が変化する)を充填した後、フラックスの
溶融以上に加熱することによりフラックスを溶融液状に
するか、又は母材とコアーをフラックスの溶融温度以上
(７３０〜９２０℃）に予熱した後、被覆鋳造する部分
の空腔内に溶融したフラックスを注入し、然る後、この
部分に各種の銅合金又はニッケル合金等の被覆金属の溶
湯を鋳込むと同時に、重力倍数３〜１５の遠心力を与え
ることにより、フラックスと溶湯の比重差が増幅され、
薄肉層におけるフラックスと溶湯の置換を容易且つ確実
なものにし、目的とする部分へ極めて高品質な金属被覆
を施す方法である。The greatest feature of the present invention is that the melting point depends on the mixing ratio of flux (borax or borax mixed with boric acid) in the cavity formed by the base material and core (core) of the coating and casting part. After heating the flux, the flux is melted into a liquid state by heating it more than the melting temperature of the flux, or the base material and the core are heated above the melting temperature of the flux.
After preheating to (730 to 920 ° C), the molten flux is injected into the cavity of the portion to be coated and cast, and then molten metal of the coating metal such as various copper alloys or nickel alloys is cast to this portion. At the same time, by applying a centrifugal force of gravity multiple of 3 to 15, the specific gravity difference between the flux and the molten metal is amplified,
This is a method for facilitating the replacement of the flux with the molten metal in a thin layer and applying an extremely high quality metal coating to a target portion.
尚、フラックスは前述のように、硼砂（Ｎa2Ｂ４Ｏ７）
又は硼砂に硼酸(Ｈ３ＢＯ3)を配合したものを用いる
が、フラックスの融点や溶融態の粘度の低くして作業を
容易にするため、通常多く行われる銅合金被覆の場合で
は、硼酸を２０〜３０％配合したもの(融点 約７３０
℃）がよい。The flux is borax (Na 2 B 4 O 7 ) as described above.
Alternatively, borax mixed with boric acid (H 3 BO 3 ) is used. However, in order to facilitate the work by lowering the melting point of the flux and the viscosity of the molten state, boric acid is often used in the case of copper alloy coating that is often performed. 20-30% blended (melting point about 730
℃) is good.
又、遠心力を与えるための重力倍数の大きさは、フラッ
クスと被覆金属との比重差が少ない場合には大きくし、
比重差の多い場合は小さくてよい。Also, the magnitude of the gravity multiple for imparting centrifugal force is increased when the difference in specific gravity between the flux and the coating metal is small,
If the difference in specific gravity is large, it may be small.
本願の場合は極めて薄肉の被覆を行うため被覆金属とフ
ラックスとを置換して鋳造することを目的としているた
め、通常の鋳込み方法では完全な置換は困難であり、遠
心鋳造により、重力倍数を５とすることにより比重差は
通常の６から３０にアップ(被覆金属の比重＝８．５，
フラックスの比重＝２．７)し、ほぼ完全に置換される
ことが立証された。重力倍数が大きい程置換し易くなる
が、反面コアーの接合部からフラックスあるいは溶融金
属の洩れを生ずる危険が倶うので１５以内に限定したも
のである。In the case of the present application, the purpose is to replace the coating metal with the flux for casting in order to perform coating with an extremely thin wall, and thus it is difficult to completely replace the coating metal by a normal casting method. As a result, the specific gravity difference is increased from the usual 6 to 30 (specific gravity of coated metal = 8.5,
The specific gravity of the flux was 2.7), and it was proved that the flux was almost completely replaced. The larger the gravity factor, the easier the replacement. However, since there is a risk of leakage of flux or molten metal from the joint of the core, it is limited to 15 or less.
本発明鋳造法によれば、フラックスを溶融状態にして被
覆部を満たしているため、接合面での酸化を生ぜず、又
フラックスを溶融状態で保持するため、７００℃以上の
高温に加熱されているので、被覆金属溶湯の湯廻り及び
溶着性が良くなり、更に遠心力を付与することにより、
フラックスと被覆金属溶湯との比重差が増幅されるので
置換が容易となり、より一層薄肉での被覆を可能とする
ことができる。According to the casting method of the present invention, since the flux is melted to fill the coating portion, no oxidation occurs at the joint surface, and in order to keep the flux in the molten state, it is heated to a high temperature of 700 ° C. or higher. Since the molten metal around the coated metal and the weldability are improved, centrifugal force is further applied,
Since the difference in specific gravity between the flux and the molten metal for coating is amplified, the replacement is facilitated, and the coating can be made thinner.
以下本発明鋳造法の一実施例を図面に基づき説明すれ
ば、第１図乃至第５図は材質ＳＣＭ４４０クロム・モリ
ブデン鋼で作られた高圧油圧ポンプ用シリンダーブロッ
ク内面に、材質ＬＢＣ−３を被覆鋳造する場合の例であ
る。An embodiment of the casting method of the present invention will be described below with reference to the drawings. In FIGS. 1 to 5, the inner surface of a cylinder block for a high-pressure hydraulic pump made of SCM440 chrome molybdenum steel is coated with the material LBC-3. This is an example of casting.
第１図は高圧油圧ポンプ用シリンダーブロック本体(１)
シリンダー部を断面図で示した全体図であり、被覆を要
する面を鎖線で示してある。Figure 1 shows the cylinder block body for high-pressure hydraulic pump (1)
It is the whole figure which showed the cylinder part by the cross-sectional view, and the surface which requires coating is shown by the chain line.
第２図は被覆鋳造を行うための鋳造法案を示したもの
で、本体(１)のシリンダー部に黒鉛棒又は軟鋼棒で作ら
れたコアー(２)を挿入し、本体(１)とコアー(２)とで形
成された空腔(被覆鋳造する部分)内に溶融したフラック
ス(３)を充填したところを示すものである。尚、図中
(４)は湯溜りである。FIG. 2 shows a casting method for performing coating casting, in which a core (2) made of a graphite rod or a mild steel rod is inserted into the cylinder part of the body (1), and the body (1) and the core ( 2 shows a state where the molten flux (3) is filled in the cavity (portion to be coated and cast) formed by 2) and 2. In the figure
(4) is a hot water pool.
第３図は被覆鋳造する部分に溶融したフラックス(３)が
充填されているところに、溶融した被覆金属(５)が鋳入
される段階を示すものである。FIG. 3 shows a stage in which the molten coating metal (5) is poured into the portion to be coated and cast with the molten flux (3).
第４図は被覆金属(５)を鋳入すると同時に、矢印(イ)方
向の遠心力を与えることにより、溶融フラックス(３)と
溶融被覆金属(５)は置換され、鋳込みが完全に行われる
状態を示したものである。Fig. 4 shows that the molten flux (3) and the molten coated metal (5) are replaced by casting the coated metal (5) and at the same time applying a centrifugal force in the direction of arrow (a), and the casting is completed. It shows the state.
第５図は堅型遠心鋳造機(６)により遠心力を与える状態
を示したものである。FIG. 5 shows a state in which centrifugal force is applied by the rigid centrifugal casting machine (6).
而して、本発明鋳造法は先ず、被覆層の厚さ(この場合
は３mm)を確保するためのコアー(２)（材質は軟鋼を使
用し、シリンダー面を加工する際に切削除去する）をセ
ットし、本体(１)との空腔に溶着を媒介させるためのフ
ラックス(３)(硼砂：硼酸＝７：３)を充填した後、加熱
炉内にて８８０〜９００℃に加熱して溶融液状とする。
(第２図) 所定の温度になったところで炉から取り出して堅型遠心
鋳造機(６)に乗せ、溶解した被覆金属(５)を鋳入する
(第３図)と同時に、重力倍数８〜１０の遠心力を与え
る。In the casting method of the present invention, first, the core (2) for securing the thickness of the coating layer (3 mm in this case) (the material is mild steel, which is cut and removed when the cylinder surface is processed) Set, and after filling flux (3) (borax: boric acid = 7: 3) for mediating welding in the cavity with the main body (1), heat it to 880 to 900 ° C in a heating furnace. Use a molten liquid.
(Fig. 2) When it reaches a predetermined temperature, it is taken out of the furnace, put on a rigid centrifugal casting machine (6), and the molten coated metal (5) is cast into it.
At the same time (Fig. 3), a centrifugal force with a gravity multiple of 8 to 10 is applied.
即ち、通常ならば、フラックス(３)の比重は約１．５、
被覆金属(５)の比重は８．９程であるから、比重差によ
って置換されるが、肉厚が薄い場合は両者の表面張力の
ため完全に置換され難いので、遠心力を与えることによ
り、比重は夫々に重力倍数を乗じた分だけ大きくなり、
比重差が増幅されるので、隅々まで確実に置換し、被覆
することができる。(第４図) この様にして、本発明法によるこれまでの実験では、厚
さ０．３mmまでの被覆が可能となっている。That is, normally, the specific gravity of the flux (3) is about 1.5,
Since the specific gravity of the coated metal (5) is about 8.9, it is replaced by the difference in specific gravity, but when the wall thickness is thin, it is difficult to completely replace it due to the surface tension of both, so by applying centrifugal force, The specific gravity increases as much as each multiplied by the gravity multiple,
Since the difference in specific gravity is amplified, it is possible to surely replace and coat every corner. (FIG. 4) In this way, in the experiments so far according to the method of the present invention, coating up to a thickness of 0.3 mm is possible.
次に本発明鋳造法の他の実施例を図面に基づき説明すれ
ば、第６図乃至第９図は材質ＦＣ３０鋳鉄からなる油圧
モーター用ピストンの内面底部に材質ＰＣＢ−２青銅を
被覆鋳造したものであり、第６図は油圧モーター用ピス
トン(７)の断面形状を示し、第７図は被覆鋳造するため
の鋳造法案を示し、被覆鋳造すべき空腔を形成するため
のコアー(２)には注型セラミック材で成型したものを使
用している。尚、図中(８)はベント(フラックスや空気
のはけ口)である。Next, another embodiment of the casting method of the present invention will be described with reference to the drawings. FIGS. 6 to 9 show a piston for a hydraulic motor made of material FC30 cast iron, in which the material PCB-2 bronze is coated and cast on the bottom of the inner surface. FIG. 6 shows a cross-sectional shape of the piston (7) for the hydraulic motor, and FIG. 7 shows a casting method for coating casting, and a core (2) for forming a cavity for coating casting. Uses a cast ceramic material. In the figure, (8) is a vent (a vent for flux and air).
第８図及び第９図は実施例Ｉと同様に、溶融フラックス
(３)の注入及び溶融被覆金属(５)の鋳込み状態を示すも
のである。FIG. 8 and FIG. 9 show the molten flux as in Example I.
It shows the injection of (3) and the casting of the molten coated metal (5).
而して、本発明鋳造法の工程順序は、実施例Ｉの場合と
同様であるが、被覆する場所と形状が異なるため、鋳造
法案は第７図に示すようにコアー(２)の中に湯溜り(４)
とベント(８)を設けるなど複雑になっている。Thus, the casting method of the present invention has the same process sequence as in Example I, but the casting method is different from that of the core (2) as shown in FIG. Bathtub (4)
It is complicated by providing a vent (8).
従って、この場合のコアー(２)は注型セラミックにて成
型したものを用い、コアー材としては溶融フラックス
(３)による浸蝕と浸透を防止するため、ジルコニア(ZrO
2−SiO2系)耐火物とＨアルミナ質(AI2O3−SiO2系)耐火
物を配合したものを採用し、更に表面にコロイダル黒鉛
を塗型したものを使用した。Therefore, in this case, the core (2) is made of cast ceramic, and the core material is molten flux.
To prevent erosion and penetration by (3), zirconia (ZrO
A mixture of 2- SiO 2 refractory and H-alumina (AI 2 O 3 —SiO 2 ) refractory was used, and the surface was coated with colloidal graphite.
尚、セラミックコアーの成型は、前述の耐火物にエチル
シリケート系のコロイダルゾル(バインダー)を加え、泥
状(スリラー)とし、注型法により成型し、低温度(２０
０〜３００℃)で仮焼成を行えば、本焼成は母材の予熱
と兼ねて行える点で都合のよい工程である。The ceramic core is molded by adding the ethyl silicate colloidal sol (binder) to the above refractory to make it into a mud (thriller), and molding it by the casting method at low temperature (20
If calcination is performed at 0 to 300 ° C., the main calcination is a convenient step in that it can be combined with preheating of the base material.
以上の方法により目的とする被覆を行うことができ、従
来行われてきた圧入加工したもの（第１０図）に比べ、
極めて信頼性が高く、性能の良い製品を製作することが
できた。The desired coating can be performed by the above method, and compared with the conventional press-fitting processing (Fig. 10),
We were able to manufacture products with extremely high reliability and high performance.
〔発明の効果〕 本発明鋳造法によれば、次の如き効果が挙げられる。[Effects of the Invention] The casting method of the present invention has the following effects.
(1)被覆厚さを薄くできるので、厚肉の場合に生ずる凝
固収縮応力による被覆面の剥がれや引け巣の発生が無
い。(1) Since the coating thickness can be reduced, peeling of the coating surface and shrinkage cavities do not occur due to the solidification shrinkage stress that occurs when the coating is thick.
(2)被覆材の溶着が完全に行われるので、油圧シリンダ
ーや操作弁本体等高圧機器部品への適用が可能となり、
多角的な機能を与えることができる。(2) Since the coating material is completely welded, it can be applied to high-pressure equipment parts such as hydraulic cylinders and operation valve bodies.
It can give various functions.
(3)被覆層の加工代が節減できるので、歩留まりが向上
し、加工工数も低減される。(3) Since the machining cost of the coating layer can be reduced, the yield is improved and the machining man-hour is also reduced.
第１図乃至第５図は本発明の一実施例の製造工程を示し
た断面図、第６図乃至第９図は本発明の他の実施例の製
造工程を示した断面図、第１０図は従来方法の断面図、
である。 符 号 (１)は高圧油圧ポンプ用シリンダーブロック本体 (２)はコアー (３)はフラックス (４)は湯溜り (５)は溶融した被覆金属 (６)は堅型遠心鋳造機 (７)は油圧モーター用ピストン本体1 to 5 are sectional views showing a manufacturing process of an embodiment of the present invention, and FIGS. 6 to 9 are sectional views showing a manufacturing process of another embodiment of the present invention, and FIG. Is a cross-sectional view of the conventional method,
Is. The code (1) is the cylinder block body for the high-pressure hydraulic pump (2) The core (3) is the flux (4) The pool (5) is the molten coating metal (6) is the rigid centrifugal casting machine (7) Piston body for hydraulic motor
Claims (1)
成される空腔内に、溶融状態のフラックスを充填し、次
に、被覆材の溶湯を鋳入すると同時に重力倍数５〜１５
の遠心力を与え、溶融フラックスと被覆金属溶湯の比重
差を増幅することにより、フラックスと被覆金属溶湯と
を置換し、薄肉の被覆鋳造を行うことを特徴とする被覆
鋳造法。1. A cavity formed by a core and a component body to be coated is filled with a flux in a molten state, and then a molten material of the coating material is poured into the cavity, and at the same time, a gravity multiple of 5 to 15 is applied.
The coating casting method is characterized in that the flux and the coating metal melt are replaced by applying a centrifugal force to amplify the difference in specific gravity between the molten flux and the coating metal melt to perform thin coating casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63308554A JPH0613140B2 (en) | 1988-12-06 | 1988-12-06 | Coating casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63308554A JPH0613140B2 (en) | 1988-12-06 | 1988-12-06 | Coating casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02155554A JPH02155554A (en) | 1990-06-14 |
| JPH0613140B2 true JPH0613140B2 (en) | 1994-02-23 |
Family
ID=17982430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63308554A Expired - Fee Related JPH0613140B2 (en) | 1988-12-06 | 1988-12-06 | Coating casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0613140B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014104466A (en) * | 2012-11-22 | 2014-06-09 | Hitachi Constr Mach Co Ltd | Method for casting cylinder block, and cylinder block casted by the method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3733437B2 (en) * | 1997-04-09 | 2006-01-11 | 株式会社明石合銅 | Cylinder block coating casting method and cylinder block |
| CN109967714B (en) * | 2019-05-07 | 2021-06-11 | 上海工程技术大学 | Composite centrifugal casting mould for titanium alloy ring-shaped piece |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4889813U (en) * | 1972-02-04 | 1973-10-29 | ||
| JPS56139271A (en) * | 1980-04-02 | 1981-10-30 | Daido Steel Co Ltd | Manufacture of composite ingot |
-
1988
- 1988-12-06 JP JP63308554A patent/JPH0613140B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014104466A (en) * | 2012-11-22 | 2014-06-09 | Hitachi Constr Mach Co Ltd | Method for casting cylinder block, and cylinder block casted by the method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02155554A (en) | 1990-06-14 |
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