WO2023112788A1 - Iron cast part, assembly part, and method for manufacturing iron cast part - Google Patents

Iron cast part, assembly part, and method for manufacturing iron cast part Download PDF

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Publication number
WO2023112788A1
WO2023112788A1 PCT/JP2022/045037 JP2022045037W WO2023112788A1 WO 2023112788 A1 WO2023112788 A1 WO 2023112788A1 JP 2022045037 W JP2022045037 W JP 2022045037W WO 2023112788 A1 WO2023112788 A1 WO 2023112788A1
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Prior art keywords
iron
cast iron
casting
ductile cast
nickel plating
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PCT/JP2022/045037
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French (fr)
Japanese (ja)
Inventor
龍太郎 今泉
周 加藤
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株式会社ファインスティールエンジニアリング
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Publication of WO2023112788A1 publication Critical patent/WO2023112788A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/19—Soldering, e.g. brazing, or unsoldering taking account of the properties of the materials to be soldered
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D5/00—Heat treatments of cast-iron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/04—Cast-iron alloys containing spheroidal graphite
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/31—Coating with metals
    • C23C18/32—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/10—Electroplating with more than one layer of the same or of different metals
    • C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/10—Electroplating with more than one layer of the same or of different metals
    • C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
    • C25D5/14—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium two or more layers being of nickel or chromium, e.g. duplex or triplex layers

Definitions

  • the present invention relates to iron casting parts (for example, ductile cast iron parts formed from ductile cast iron), and more particularly to iron casting parts used in combination with stainless steel parts and a method of manufacturing the same.
  • the invention also relates to an assembly that combines cast iron and stainless steel parts.
  • parts made of stainless steel have been used as parts that make up various mechanical products (for example, various automobile parts). Further, as such a stainless steel part, there is a part that is provided with a plurality of component parts and configured as an assembly part by combining these component parts, as disclosed in Patent Document 1, for example.
  • the present invention provides an iron casting part body formed by casting iron and an iron casting part having a nickel plating layer formed directly on the iron casting part body.
  • the cast iron part is designed to be used in combination with a stainless steel part made of stainless steel, and the nickel plating layer is formed on at least a portion of the cast iron part that is joined to the stainless steel part. preferably
  • the cast iron part may have a fitting hole into which at least a part of the stainless steel part fits, and the nickel plating layer may be formed at least on the inner peripheral surface of the fitting hole. can.
  • the nickel plating layer is formed by stacking a plurality of layers.
  • the cast iron part is a ductile cast iron part having a ductile cast iron part body formed by casting ductile cast iron as the iron casting part body and a nickel plating layer formed directly on the ductile cast iron part body.
  • the present invention provides an assembly part formed by combining an iron casting part and a stainless steel part, wherein the iron casting part comprises an iron casting part main body formed by casting iron and the iron casting
  • the cast iron part and the stainless steel part may be joined by brazing, with a nickel plating layer formed directly on the part body.
  • the iron casting part includes a ductile cast iron part body formed by casting ductile cast iron as the iron casting part body, and a nickel plating layer formed directly on the ductile cast iron part body. wherein the assembly may be formed by combining the ductile iron part and the stainless steel part.
  • the present invention provides a method for manufacturing an iron casting part comprising an iron casting part main body formed from an iron casting, and an iron casting part having a nickel plating layer formed on the iron casting part main body, a step of forming a casting component body by casting iron; a step of removing surface oxides from the iron casting component body; a step of cleaning the iron casting component body from which surface oxides have been removed; and nickel plating directly onto the iron casting component body.
  • a step of heat-treating the cast iron component may be provided.
  • the heat treatment may be a process of heating the cast iron part in a heating furnace at 180°C to 220°C for 4 hours or more.
  • the iron casting part includes a ductile cast iron part body formed by casting ductile cast iron as the iron casting part body, and is directly formed on the ductile cast iron part body. It may be a ductile cast iron part with a nickel plating layer.
  • the iron casting part (for example, ductile cast iron part 1) includes an iron casting part body (for example, ductile cast iron body 10) formed by casting iron (for example, ductile cast iron), Since it has a nickel plating layer (for example, the first nickel plating layer 11 and the second nickel plating layer 12) formed directly on the iron casting part body, it can be used as a substitute for products made of stainless steel. In addition to having a high degree of mechanical strength and an appearance that does not give a sense of discomfort, it has a large degree of freedom in manufacturing that can handle complicated shapes, and has high bondability in brazing with other parts. can be provided in
  • the cast iron part is used in combination with a stainless steel part (for example, the stainless steel part 2) and a nickel plating layer is formed on the joining portion with the stainless steel part, Very high bondability can be achieved in brazing stainless steel parts.
  • a stainless steel part for example, the stainless steel part 2
  • a nickel plating layer is formed on the joining portion with the stainless steel part
  • the iron casting part is provided with a fitting hole (for example, fitting hole 6) into which at least part of the stainless steel part (for example, insertion end 7) is fitted, and the nickel plating layer is formed on the inner periphery of the fitting hole. If it is formed on the surface (for example, the inner peripheral surface 6A), high bondability can be ensured when the stainless steel part is joined to the fitting hole of the cast iron part by brazing.
  • the nickel plating layer is formed by stacking a plurality of layers (for example, two layers), the nickel plating layer can be formed to have a more uniform and appropriate thickness over the entire surface of the cast iron part. can be managed to
  • the stainless steel part is joined to the iron casting part having the nickel plating layer by brazing, so that the iron casting part and the stainless steel part are , can be joined with high bondability to provide high quality assembled parts.
  • an iron casting part of the present invention there are provided a step of removing surface oxides from a cast iron casting part body (for example, the ductile cast iron part body 10), and the iron casting from which the surface oxides have been removed. Since a step of cleaning the component body is provided, the nickel plating layer can be formed directly on the cast iron component body. Therefore, since there is no need for an inclusion such as copper between the main body of the cast iron part and the nickel plating layer, the manufacturing cost can be reduced.
  • the gas for example, hydrogen gas
  • the iron is to increase the adhesion between a cast part body and a nickel plating layer, and to appropriately prevent peeling and blistering of the nickel plating layer even when a stainless steel part is joined to an iron casting part by brazing. can be done.
  • the heat treatment is a process of heating the iron casting part in a heating furnace at 180°C to 220°C for 4 hours or more, the adhesion between the iron casting part main body and the nickel plating layer can be effectively improved.
  • FIG. 1 is a perspective view of an assembly using ductile cast iron components in an embodiment of the invention.
  • FIG. It is a perspective view of the assembly parts of the same. It is a side view of the same assembled parts. It is an exploded perspective view of the assembly parts of the same. It is sectional drawing which similarly shows a part of assembling component.
  • 1 to 4 show an assembled part 3 using a ductile cast iron part 1 according to an embodiment of the invention. As shown, the assembly 3 is constructed by combining a ductile cast iron part 1 and a stainless steel part 2 .
  • the ductile cast iron part 1 is a plate member having a flat, substantially rectangular parallelepiped shape, and is provided with a fitting hole 6 penetrating from the center of the front surface 4 to the center of the back surface 5 .
  • the stainless steel part 2 is a pipe member made of stainless steel (eg, SUS304) and has a cylindrical shape with an outer diameter approximately the same as the inner diameter of the fitting hole 6 of the ductile cast iron part 1 .
  • Assembly part 3 is formed by fitting insertion end 7 of stainless steel part 2 into fitting hole 6 of ductile iron part 1 and assembling stainless steel part 2 to ductile iron part 1 .
  • the ductile cast iron part 1 is formed by casting a ductile cast iron part body 10 formed by casting ductile cast iron (spheroidal graphite cast iron, for example, FCD450), and the surface of the ductile cast iron part body 10.
  • ductile cast iron spheroidal graphite cast iron, for example, FCD450
  • a first nickel plating layer 11 and a second nickel plating layer 12 are provided.
  • the first nickel plating layer 11 is formed directly on the entire surface of the ductile cast iron part body 10 (including the inner peripheral surface 6A of the fitting hole 6). That is, no inclusion such as copper is present between the ductile cast iron component main body 10 and the first nickel plating layer 11 . More specifically, after the ductile cast iron component body 10 is formed by casting, the surface is subjected to cutting treatment (treatment for removing surface oxides), and then the surface is carefully washed. After such surface preparation, the ductile cast iron body 10 is plated with nickel. As a result, the adhesion of the nickel plating to the surface of the ductile cast iron component main body 10 can be sufficiently improved, and the surface of the ductile cast iron component main body 10 can be directly nickel-plated. In this manner, the first nickel plating layer 11 is directly formed on the surface of the ductile cast iron component body 10 .
  • the second nickel plating layer 12 is formed on the first nickel plating layer 11 by plating the first nickel plating layer 11 with nickel.
  • the ductile cast iron component 1 is double nickel plated, so the thickness of the nickel plating layer (i.e., the first nickel
  • the total thickness of the plated layer 11 and the second nickel plated layer 12) can be appropriately controlled so as to have a more uniform and appropriate thickness over the entire surface. Therefore, the ductile cast iron part 1 can be appropriately provided with a nickel plating layer having an appropriate thickness over the entire surface, so that it can have high corrosion resistance.
  • the insertion end 7 of the stainless steel part 2 is inserted into the fitting hole 6 of the ductile cast iron part 1 from the surface 4 side to connect the ductile cast iron part 1 and the stainless steel part 2. do.
  • the assembly component 3 is formed by joining the connecting portions by brazing. More specifically, the brazing material 15 (for example, silver brazing) is applied to the connecting portion of the ductile cast iron part 1 and the stainless steel part 2 from the surface 4 side of the ductile cast iron part 1, thereby forming a fitting hole by capillary action. 6 and the outer peripheral surface 7A of the insertion end 7 of the stainless steel part 2, and the insertion end 7 of the stainless steel part 2 penetrates into the inner peripheral surface 6A of the fitting hole 6 of the ductile cast iron part 1. It is designed to be strongly bonded to the In other words, it is possible to realize bonding with excellent so-called wettability of silver brazing.
  • the stainless steel part 1 since the surface of the ductile cast iron part 1 is provided with a nickel plating layer (second nickel plating layer 12) including the inner peripheral surface 6A of the fitting hole 6, which is the joining portion, the stainless steel part
  • the bondability in brazing to 2 becomes very high. That is, since surface oxide is less likely to form on the surface of the nickel plating layer, the surface oxide does not impede bonding. For this reason, it is considered that the bondability in brazing the ductile cast iron part 1 and the stainless steel part 2 is rather higher than in the case where the stainless steel parts are joined together.
  • the ductile cast iron part 1 of the present embodiment includes the ductile cast iron part main body 10 formed by casting the ductile cast iron and the double nickel plating layer ( With the first nickel-plated layer 11 and the second nickel-plated layer 12), it can be a practical replacement for stainless steel parts. That is, ductile cast iron is inexpensive and has sufficient strength compared to stainless steel. In addition, by casting ductile cast iron, parts having complicated shapes can be formed with a high degree of freedom. Therefore, the ductile cast iron part 1 can be inexpensive, yet have sufficiently high mechanical strength and a desired shape.
  • the surface of the ductile cast iron part 1 is provided with the double nickel plating layers 11 and 12, there is also the effect of enhancing the bondability in brazing the ductile cast iron part 1 and the stainless steel part 2.
  • the appearance of the ductile cast iron component 1 having a nickel-plated surface can be made similar to a product made of stainless steel.
  • the nickel plating layer is formed directly on the surface of the ductile cast iron part main body 10, it can be formed at a low cost because there is no inclusion such as under copper.
  • the ductile cast iron part 1 of the present embodiment as a substitute for a product made of stainless steel (for example, SUS304), it has sufficient performance in terms of mechanical strength and the like, and has a comfortable appearance. It can be provided at low cost.
  • the ductile cast iron part 1 is combined with the stainless steel part 2 to form the assembly part 3, the brazing bondability between the ductile cast iron part 1 and the stainless steel part 2 is very high. A high quality joined assembly 3 can be provided at low cost.
  • ductile cast iron part 1 a method for manufacturing the ductile cast iron part 1 according to this embodiment will be described in detail.
  • a ductile cast iron component body 10 having a desired shape is formed by casting ductile cast iron (for example, FCD450).
  • the surface of the ductile cast iron part main body 10 is subjected to cutting treatment to remove surface oxides. After the surface oxide removal process is completed, the surface of the ductile cast iron component body 10 is thoroughly cleaned and ready for direct nickel plating thereon.
  • the entire surface of the ductile cast iron component main body 10 is directly plated with nickel to form the first nickel plating layer 11 .
  • a second nickel plating process is performed to form a second nickel plating layer 12 on the first nickel plating layer 11 to form the second nickel plating layer 12 on the surface of the ductile cast iron part main body 10.
  • a ductile cast iron part 1 with nickel plating layers 11, 12 is formed.
  • the ductile cast iron part 1 is subjected to heat treatment as a post-treatment of the nickel plating treatment. Specifically, the ductile cast iron part 1 is placed in a heating furnace at 180° C. to 200° C. (at least 100° C. or higher) and heat-treated for 4 hours or longer (preferably 5 hours or longer).
  • a post-heat treatment the adhesion between the ductile cast iron part main body 10 and the nickel plating layers 11 and 12 can be enhanced, and when brazing for connecting the ductile cast iron part 1 and the stainless steel part 2, , the nickel plating layers 11 and 12 can be appropriately prevented from being peeled off and swollen.
  • the ductile cast iron component body 10 is formed by casting ductile cast iron, various gases (for example, hydrogen gas) are enclosed in the texture of the ductile cast iron component body 10. ing. Therefore, gas may be generated between the ductile cast iron part body 10 and the nickel plating layers 11 and 12 at high temperatures when the ductile cast iron part 1 is brazed to the stainless steel part 2 . Such generation of gas causes a phenomenon in which the nickel plating layers 11 and 12 are peeled off from the ductile cast iron component main body 10, and a phenomenon in which the nickel plating layers 11 and 12 are swollen like water blisters. Such a phenomenon occurs at a certain rate when a plurality of ductile cast iron parts 1 are manufactured. It is thought that this is due to factors such as success.
  • gases for example, hydrogen gas
  • the ductile cast iron part 1 is subjected to a predetermined heat treatment to remove gas (especially hydrogen gas) from between the ductile cast iron part main body 10 and the nickel plating layers 11 and 12.
  • gas especially hydrogen gas
  • the adhesion between the ductile cast iron part main body 10 and the nickel plating layers 11 and 12 is enhanced.
  • heat treatment may be performed as a post-treatment after plating to eliminate hydrogen embrittlement (material weakening due to hydrogen).
  • the heat treatment in the present invention is also performed as a post-treatment after plating, it is different in purpose from baking that is performed along with general plating. That is, while the baking in the prior art is only performed to eliminate hydrogen embrittlement, the heat treatment in the present invention is particularly effective in removing inclusions such as copper on the surface of the ductile cast iron part main body 10. In the structure in which the nickel plating layers 11 and 12 are directly formed, this is performed to improve the adhesion between the ductile cast iron part body 10 and the nickel plating layers 11 and 12, and the purpose of the treatment is completely different from that of the conventional technology. is.
  • the present invention is not limited to the contents of the above embodiments.
  • the ductile cast iron part and the assembled part to which the present invention is applied are not limited to the specific forms of the ductile cast iron part 1 and the assembled part 3 in the above embodiment.
  • INDUSTRIAL APPLICABILITY The present invention is applicable to various types of mechanical products including various automobile parts.
  • the form of connecting and joining the ductile cast iron part and the stainless steel part is not limited to the form (fitting of the insertion end 7 into the fitting hole 6) in the above embodiment.
  • any form of connection and joining of ductile cast iron parts and stainless steel parts may be employed.
  • the iron casting part may be formed using an iron casting part body cast from an iron other than ductile cast iron.
  • the present invention can be widely used for various mechanical products such as automobile parts and manufacturing methods thereof.

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Abstract

[Problem] To provide: an iron cast part that can be used as a substitute for a part made of stainless steel; and a method for manufacturing the same. Further, to provide an assembly part using an iron cast part that can be used as a substitute for a part made of stainless steel. [Solution] In the present invention, a ductile cast iron part (1) comprises: a ductile cast iron part body (10) formed by casting ductile cast iron; and a first nickel plating layer (11) and a second nickel plating layer (12) formed directly on the surface of the ductile cast iron part body (10). An assembly part (3) is formed by inserting an insertion end section (7) of a stainless-steel part (2) into a fitting hole (6) in the ductile cast iron part (1) and joining the foregoing by brazing with a brazing material (15).

Description

鉄鋳物部品、組み立て部品及び鉄鋳物部品の製造方法Iron casting parts, assembly parts, and methods for manufacturing iron casting parts
　本発明は、鉄鋳物部品（例えば、ダクタイル鋳鉄から形成されるダクタイル鋳鉄部品）に関し、特にステンレス鋼製の部品と組み合わせて用いられる鉄鋳物部品及びその製造方法に関する。また、本発明は、鉄鋳物部品とステンレス鋼部品を組み合わせた組み立て部品に関する。 The present invention relates to iron casting parts (for example, ductile cast iron parts formed from ductile cast iron), and more particularly to iron casting parts used in combination with stainless steel parts and a method of manufacturing the same. The invention also relates to an assembly that combines cast iron and stainless steel parts.
　従来から、各種機械製品を構成する部品（例えば、各種自動車部品）として、ステンレス鋼から形成された部品が用いられてきている。また、このようなステンレス鋼製の部品としては、例えば特許文献１のように、複数の構成部品を備え、これらの構成部品を組み合わせた組み立て部品として構成されるものもある。 　Conventionally, parts made of stainless steel have been used as parts that make up various mechanical products (for example, various automobile parts). Further, as such a stainless steel part, there is a part that is provided with a plurality of component parts and configured as an assembly part by combining these component parts, as disclosed in Patent Document 1, for example.
特開２０１８－１７２７３５号公報JP 2018-172735 A
　ところで、ステンレス鋼は一般に高価であるため、コスト削減のためには、ステンレス鋼からなる部品に代えて、より安価な代替品を用いることが考えられる。例えば、複数のステンレス鋼製の構成部品からなる組み立て部品においては、一部の構成部品を代替品に変更することによって、効果的にコスト削減を行うことができる。このような代替品には、性能及び外観においてステンレス鋼製の部品の代替として実用に耐えるものであることが求められるとともに、組み立て部品内において用いられる場合には、他の構成部品(例えばステンレス鋼製の部品）との接合性においても優れたものであることが求められる。 By the way, since stainless steel is generally expensive, it is conceivable to use cheaper alternatives instead of parts made of stainless steel in order to reduce costs. For example, in a multi-stainless steel component assembly, substituting some components can effectively reduce costs. Such replacements are required to be viable in performance and appearance as replacements for stainless steel parts and, when used in subassemblies, to other components (e.g. stainless steel). It is also required to have excellent bondability with the parts of the product).
　本発明は、以上のような課題に着目してなされたもので、ステンレス鋼からなる部品の代替品として使用可能な鉄鋳物部品及びその製造方法を提供することを目的とする。また、本発明は、ステンレス鋼からなる部品の代替品として使用可能な鉄鋳物部品を用いた組み立て部品を提供することを目的とする。 The present invention has been made with a focus on the above problems, and aims to provide an iron casting part that can be used as a substitute for parts made of stainless steel, and a method of manufacturing the same. Another object of the present invention is to provide an assembly using cast iron parts that can be used as substitutes for parts made of stainless steel.
　本発明は、鉄の鋳造により形成された鉄鋳物部品本体と、前記鉄鋳物部品本体上に直接形成されたニッケルメッキ層を備えた鉄鋳物部品を提供するものである。 The present invention provides an iron casting part body formed by casting iron and an iron casting part having a nickel plating layer formed directly on the iron casting part body.
　前記鉄鋳物部品は、ステンレス鋼から形成されたステンレス鋼部品と組み合わせて用いられるようになっており、前記ニッケルメッキ層は、前記鉄鋳物部品の少なくとも前記ステンレス鋼部品と接合される部分に形成されているのが望ましい。 The cast iron part is designed to be used in combination with a stainless steel part made of stainless steel, and the nickel plating layer is formed on at least a portion of the cast iron part that is joined to the stainless steel part. preferably
　前記鉄鋳物部品は、前記ステンレス鋼部品の少なくとも一部が嵌合する嵌合穴を備え、前記ニッケルメッキ層が、少なくとも前記嵌合穴の内周面上に形成されているものとすることができる。 The cast iron part may have a fitting hole into which at least a part of the stainless steel part fits, and the nickel plating layer may be formed at least on the inner peripheral surface of the fitting hole. can.
　前記ニッケルメッキ層は、複数層が重ねて形成されているのが望ましい。 It is desirable that the nickel plating layer is formed by stacking a plurality of layers.
　前記鉄鋳物部品は、ダクタイル鋳鉄の鋳造により形成されたダクタイル鋳鉄部品本体を前記鉄鋳物部品本体として備えるとともに、前記ダクタイル鋳鉄部品本体上に直接形成されたニッケルメッキ層を備えたダクタイル鋳鉄部品であってもよい。 The cast iron part is a ductile cast iron part having a ductile cast iron part body formed by casting ductile cast iron as the iron casting part body and a nickel plating layer formed directly on the ductile cast iron part body. may
　また、本発明は、鉄鋳物部品とステンレス鋼部品を組み合わせて形成される組み立て部品を提供するものであり、前記鉄鋳物部品は、鉄の鋳造により形成された鉄鋳物部品本体と、前記鉄鋳物部品本体上に直接形成されたニッケルメッキ層を備え、前記鉄鋳物部品と前記ステンレス鋼部品は、ロウ付けにより接合されているようにしたものとすることができる。 Further, the present invention provides an assembly part formed by combining an iron casting part and a stainless steel part, wherein the iron casting part comprises an iron casting part main body formed by casting iron and the iron casting The cast iron part and the stainless steel part may be joined by brazing, with a nickel plating layer formed directly on the part body.
　本発明の組み立て部品において、前記鉄鋳物部品は、ダクタイル鋳鉄の鋳造により形成されたダクタイル鋳鉄部品本体を前記鉄鋳物部品本体として備えるとともに、前記ダクタイル鋳鉄部品本体上に直接形成されたニッケルメッキ層を備えたダクタイル鋳鉄部品であり、前記組み立て部品は、前記ダクタイル鋳鉄部品とステンレス鋼部品を組み合わせて形成されるようにしてもよい。 In the assembly part of the present invention, the iron casting part includes a ductile cast iron part body formed by casting ductile cast iron as the iron casting part body, and a nickel plating layer formed directly on the ductile cast iron part body. wherein the assembly may be formed by combining the ductile iron part and the stainless steel part.
　また、本発明は、鉄鋳物から形成された鉄鋳物部品本体と、前記鉄鋳物部品本体上に形成されたニッケルメッキ層を備えた鉄鋳物部品を製造する鉄鋳物部品の製造方法において、　前記鉄鋳物部品本体を鉄の鋳造により形成する工程と、前記鉄鋳物部品本体の表面酸化物を除去する工程と、表面酸化物が除去された前記鉄鋳物部品本体を洗浄する工程と、洗浄後の前記鉄鋳物部品本体上に直接ニッケルメッキを施す工程とを備えたものとすることができる。 In addition, the present invention provides a method for manufacturing an iron casting part comprising an iron casting part main body formed from an iron casting, and an iron casting part having a nickel plating layer formed on the iron casting part main body, a step of forming a casting component body by casting iron; a step of removing surface oxides from the iron casting component body; a step of cleaning the iron casting component body from which surface oxides have been removed; and nickel plating directly onto the iron casting component body.
　前記ニッケルメッキを施す工程の後処理として、前記鉄鋳物部品に熱処理を施す工程を備えてもよい。 As a post-treatment of the nickel plating step, a step of heat-treating the cast iron component may be provided.
　前記熱処理は、前記鉄鋳物部品を１８０℃～２２０℃の加熱炉内で４時間以上にわたって加熱する処理であってもよい。 The heat treatment may be a process of heating the cast iron part in a heating furnace at 180°C to 220°C for 4 hours or more.
　本発明の鉄鋳物部品の製造方法において、前記鉄鋳物部品は、ダクタイル鋳鉄の鋳造により形成されたダクタイル鋳鉄部品本体を前記鉄鋳物部品本体として備えるとともに、前記ダクタイル鋳鉄部品本体上に直接形成されたニッケルメッキ層を備えたダクタイル鋳鉄部品であってもよい。 In the iron casting part manufacturing method of the present invention, the iron casting part includes a ductile cast iron part body formed by casting ductile cast iron as the iron casting part body, and is directly formed on the ductile cast iron part body. It may be a ductile cast iron part with a nickel plating layer.
　本発明の鉄鋳物部品によれば、鉄鋳物部品（例えば、ダクタイル鋳鉄部品１）は、鉄（例えば、ダクタイル鋳鉄）の鋳造により形成された鉄鋳物部品本体（例えば、ダクタイル鋳鉄本体１０）と、鉄鋳物部品本体上に直接形成されたニッケルメッキ層（例えば、第１ニッケルメッキ層１１及び第２ニッケルメッキ層１２）を備えているので、ステンレス鋼からなる製品の代替品として用いることにより、十分な機械的強度及び違和感のない外観を有するとともに、製造においては複雑な形状にも対応し得る大きな自由度を有し、他の部品とのロウ付けにおける高い接合性を有する代替品を、低コストで提供することができる。 According to the iron casting part of the present invention, the iron casting part (for example, ductile cast iron part 1) includes an iron casting part body (for example, ductile cast iron body 10) formed by casting iron (for example, ductile cast iron), Since it has a nickel plating layer (for example, the first nickel plating layer 11 and the second nickel plating layer 12) formed directly on the iron casting part body, it can be used as a substitute for products made of stainless steel. In addition to having a high degree of mechanical strength and an appearance that does not give a sense of discomfort, it has a large degree of freedom in manufacturing that can handle complicated shapes, and has high bondability in brazing with other parts. can be provided in
　また、鉄鋳物部品がステンレス鋼部品（例えば、ステンレス鋼部品２）と組み合わせて用いられるようにし、ニッケルメッキ層がステンレス鋼部品との接合部分に形成されているようにすれば、鉄鋳物部品に対するステンレス鋼部品のロウ付けにおける接合性を非常に高いものにできる。 In addition, if the cast iron part is used in combination with a stainless steel part (for example, the stainless steel part 2) and a nickel plating layer is formed on the joining portion with the stainless steel part, Very high bondability can be achieved in brazing stainless steel parts.
　また、鉄鋳物部品に、ステンレス鋼部品の少なくとも一部（例えば、挿入端部７）が嵌合する嵌合穴（例えば、嵌合穴６）を備え、ニッケルメッキ層が嵌合穴の内周面（例えば、内周面６Ａ）上に形成されているようにすれば、鉄鋳物部品の嵌合穴に対してステンレス鋼部品がロウ付けにより接合されるときに、高い接合性を確保できる。 In addition, the iron casting part is provided with a fitting hole (for example, fitting hole 6) into which at least part of the stainless steel part (for example, insertion end 7) is fitted, and the nickel plating layer is formed on the inner periphery of the fitting hole. If it is formed on the surface (for example, the inner peripheral surface 6A), high bondability can be ensured when the stainless steel part is joined to the fitting hole of the cast iron part by brazing.
　また、ニッケルメッキ層が複数層（例えば２層）重ねて形成されるようにすれば、ニッケルメッキ層を、鉄鋳物部品の表面全体で、より均一に近い適切な厚さを持つように、適切に管理できる。 In addition, if the nickel plating layer is formed by stacking a plurality of layers (for example, two layers), the nickel plating layer can be formed to have a more uniform and appropriate thickness over the entire surface of the cast iron part. can be managed to
　また、本発明の組み立て部品（例えば、組み立て部品３）によれば、ステンレス鋼部品が、ニッケルメッキ層を有する鉄鋳物部品に対してロウ付けにより接合されるので、鉄鋳物部品とステンレス鋼部品は、高い接合性をもって接合され、高品質の組み立て部品を提供できる。 Further, according to the assembly part of the present invention (for example, the assembly part 3), the stainless steel part is joined to the iron casting part having the nickel plating layer by brazing, so that the iron casting part and the stainless steel part are , can be joined with high bondability to provide high quality assembled parts.
　また、本発明の鉄鋳物部品の製造方法によれば、鋳造された鉄鋳物部品本体（例えば、ダクタイル鋳鉄部品本体１０）の表面酸化物を除去する工程と、表面酸化物が除去された鉄鋳物部品本体を洗浄する工程が備えられるので、鉄鋳物部品本体上に直接ニッケルメッキ層を形成することができる。したがって、鉄鋳物部品本体とニッケルメッキ層の間に銅下等の介在物が不要となるので、製造コストを低減できる。 Further, according to the method for manufacturing an iron casting part of the present invention, there are provided a step of removing surface oxides from a cast iron casting part body (for example, the ductile cast iron part body 10), and the iron casting from which the surface oxides have been removed. Since a step of cleaning the component body is provided, the nickel plating layer can be formed directly on the cast iron component body. Therefore, since there is no need for an inclusion such as copper between the main body of the cast iron part and the nickel plating layer, the manufacturing cost can be reduced.
　また、前記ニッケルメッキを施す工程の後処理として、前記鉄鋳物部品に熱処理を施す工程を備えれば、鉄鋳物部品本体とニッケルメッキ層の間からガス（例えば水素ガス）を除去して、鉄鋳物部品本体とニッケルメッキ層の密着性を高めることができ、鉄鋳物部品にステンレス鋼部品をロウ付けにより接合する場合等においても、ニッケルメッキ層に剥がれや膨れが生じることを適切に防止することができる。 Further, if a step of heat-treating the cast iron component is provided as a post-treatment of the step of applying the nickel plating, the gas (for example, hydrogen gas) is removed from between the main body of the cast iron component and the nickel plating layer, and the iron is To increase the adhesion between a cast part body and a nickel plating layer, and to appropriately prevent peeling and blistering of the nickel plating layer even when a stainless steel part is joined to an iron casting part by brazing. can be done.
　前記熱処理を、前記鉄鋳物部品を１８０℃～２２０℃の加熱炉内で４時間以上にわたって加熱する処理とすれば、鉄鋳物部品本体とニッケルメッキ層の密着性を効果的に高めることができる。 If the heat treatment is a process of heating the iron casting part in a heating furnace at 180°C to 220°C for 4 hours or more, the adhesion between the iron casting part main body and the nickel plating layer can be effectively improved.
本発明の実施形態におけるダクタイル鋳鉄部品を用いた組み立て部品の斜視図である。1 is a perspective view of an assembly using ductile cast iron components in an embodiment of the invention; FIG. 同じく組み立て部品の斜視図である。It is a perspective view of the assembly parts of the same. 同じく組み立て部品の側面図である。It is a side view of the same assembled parts. 同じく組み立て部品の分解斜視図である。It is an exploded perspective view of the assembly parts of the same. 同じく組み立て部品の一部を示す断面図である。It is sectional drawing which similarly shows a part of assembling component.
　以下、添付図面に基づいて本発明の実施形態について説明する。
　図１～図４には、本発明の実施形態におけるダクタイル鋳鉄部品１を用いた組み立て部品３を示す。図示されるように、組み立て部品３は、ダクタイル鋳鉄部品１とステンレス鋼部品２を組み合わせて構成されている。 BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the accompanying drawings.
1 to 4 show an assembled part 3 using a ductile cast iron part 1 according to an embodiment of the invention. As shown, the assembly 3 is constructed by combining a ductile cast iron part 1 and a stainless steel part 2 .
　ダクタイル鋳鉄部品１は、偏平な略直方体形状を有する板部材であり、表面４の中央部から裏面５の中央部にかけて貫通した嵌合穴６を備えている。一方、ステンレス鋼部品２は、ステンレス鋼（例えばＳＵＳ３０４）から形成されたパイプ部材であり、ダクタイル鋳鉄部品１の嵌合穴６の内径とほぼ同一径の外径を有する円筒形状をしている。組み立て部品３は、ステンレス鋼部品２の挿入端部７をダクタイル鋳鉄部品１の嵌合穴６に嵌合させ、ステンレス鋼部品２をダクタイル鋳鉄部品１に組み付けることにより形成される。 The ductile cast iron part 1 is a plate member having a flat, substantially rectangular parallelepiped shape, and is provided with a fitting hole 6 penetrating from the center of the front surface 4 to the center of the back surface 5 . On the other hand, the stainless steel part 2 is a pipe member made of stainless steel (eg, SUS304) and has a cylindrical shape with an outer diameter approximately the same as the inner diameter of the fitting hole 6 of the ductile cast iron part 1 . Assembly part 3 is formed by fitting insertion end 7 of stainless steel part 2 into fitting hole 6 of ductile iron part 1 and assembling stainless steel part 2 to ductile iron part 1 .
　図５に示すように、ダクタイル鋳鉄部品１は、ダクタイル鋳鉄（球状黒鉛鋳鉄、例えばＦＣＤ４５０）の鋳造により形成されたダクタイル鋳鉄部品本体１０と、ダクタイル鋳鉄部品本体１０の表面に二重に施された第１ニッケルメッキ層１１と第２ニッケルメッキ層１２を備えている。 As shown in FIG. 5, the ductile cast iron part 1 is formed by casting a ductile cast iron part body 10 formed by casting ductile cast iron (spheroidal graphite cast iron, for example, FCD450), and the surface of the ductile cast iron part body 10. A first nickel plating layer 11 and a second nickel plating layer 12 are provided.
　第１ニッケルメッキ層１１は、ダクタイル鋳鉄部品本体１０の表面全体（嵌合穴６の内周面６Aを含む）の上に、直接形成されている。すなわち、ダクタイル鋳鉄部品本体１０と第１ニッケルメッキ層１１の間には、銅下等の介在物が存在していない。詳しく説明すると、ダクタイル鋳鉄部品本体１０は、鋳造により形成された後、表面に切削処理（表面酸化物を除去する処理）を施し、その後、表面の入念な洗浄が行われる。このような表面の下処理の後に、ダクタイル鋳鉄本体１０に対してニッケルメッキを施す。これにより、ダクタイル鋳鉄部品本体１０の表面に対するニッケルメッキのノリを十分に向上させることができ、ダクタイル鋳鉄部品本体１０の表面に直接ニッケルメッキを施すことができる。このようにして、ダクタイル鋳鉄部品本体１０の表面上には、直接、第１ニッケルメッキ層１１が形成されている。 The first nickel plating layer 11 is formed directly on the entire surface of the ductile cast iron part body 10 (including the inner peripheral surface 6A of the fitting hole 6). That is, no inclusion such as copper is present between the ductile cast iron component main body 10 and the first nickel plating layer 11 . More specifically, after the ductile cast iron component body 10 is formed by casting, the surface is subjected to cutting treatment (treatment for removing surface oxides), and then the surface is carefully washed. After such surface preparation, the ductile cast iron body 10 is plated with nickel. As a result, the adhesion of the nickel plating to the surface of the ductile cast iron component main body 10 can be sufficiently improved, and the surface of the ductile cast iron component main body 10 can be directly nickel-plated. In this manner, the first nickel plating layer 11 is directly formed on the surface of the ductile cast iron component body 10 .
　第２ニッケルメッキ層１２は、第１ニッケルメッキ層１１の上にニッケルメッキを施すことにより、第１ニッケルメッキ層１１の上に形成される。このように、ダクタイル鋳鉄部品１には、二重のニッケルメッキが施されているので、単一のニッケルメッキ層しか有さない場合と比較して、ニッケルメッキ層の厚み（すなわち、第１ニッケルメッキ層１１と第２ニッケルメッキ層１２の合計の厚み）を、表面全体にわたって、より均一に近い適切な厚みとなるように、適切に管理することができる。したがって、ダクタイル鋳鉄部品１は、表面全体に適切な厚みを有するニッケルメッキ層を適切に備えるようにできるので、高い耐食性を有するものにできる。 The second nickel plating layer 12 is formed on the first nickel plating layer 11 by plating the first nickel plating layer 11 with nickel. In this way, the ductile cast iron component 1 is double nickel plated, so the thickness of the nickel plating layer (i.e., the first nickel The total thickness of the plated layer 11 and the second nickel plated layer 12) can be appropriately controlled so as to have a more uniform and appropriate thickness over the entire surface. Therefore, the ductile cast iron part 1 can be appropriately provided with a nickel plating layer having an appropriate thickness over the entire surface, so that it can have high corrosion resistance.
　組み立て部品３の製造においては、ステンレス鋼部品２の挿入端部７を、ダクタイル鋳鉄部品１の嵌合穴６に対して表面４側から挿入して、ダクタイル鋳鉄部品１とステンレス鋼部品２を連結する。この連結部分をロウ付けで接合することにより、組み立て部品３が形成される。詳しくは、ロウ材１５（例えば銀ロウ）が、ダクタイル鋳鉄部品１とステンレス鋼部品２の連結部分に対して、ダクタイル鋳鉄部品１の表面４側から施されることにより、毛細管現象により嵌合穴６の内周面６Aとステンレス鋼部品２の挿入端部７の外周面７A間に浸透していき、ステンレス鋼部品２挿入端部７がダクタイル鋳鉄部品１の嵌合穴６の内周面６Aに強固に接合されるようになっている。すなわち、銀ロウの所謂濡れ性に優れた接合が実現できる。 In manufacturing the assembly part 3, the insertion end 7 of the stainless steel part 2 is inserted into the fitting hole 6 of the ductile cast iron part 1 from the surface 4 side to connect the ductile cast iron part 1 and the stainless steel part 2. do. The assembly component 3 is formed by joining the connecting portions by brazing. More specifically, the brazing material 15 (for example, silver brazing) is applied to the connecting portion of the ductile cast iron part 1 and the stainless steel part 2 from the surface 4 side of the ductile cast iron part 1, thereby forming a fitting hole by capillary action. 6 and the outer peripheral surface 7A of the insertion end 7 of the stainless steel part 2, and the insertion end 7 of the stainless steel part 2 penetrates into the inner peripheral surface 6A of the fitting hole 6 of the ductile cast iron part 1. It is designed to be strongly bonded to the In other words, it is possible to realize bonding with excellent so-called wettability of silver brazing.
　この場合、ダクタイル鋳鉄部品１の表面には、接合部分である嵌合穴６の内周面６Ａを含めて、ニッケルメッキ層（第２ニッケルメッキ層１２）が備えられているので、ステンレス鋼部品２に対するロウ付けにおける接合性は非常に高いものとなる。すなわち、ニッケルメッキ層の表面には表面酸化物ができにくいため、表面酸化物によって接合が阻害されることがない。このため、ダクタイル鋳鉄部品１とステンレス鋼部品２のロウ付けにおける接合性は、ステンレス鋼製の部品同士を接合した場合よりも、むしろ高いものになると考えられる。 In this case, since the surface of the ductile cast iron part 1 is provided with a nickel plating layer (second nickel plating layer 12) including the inner peripheral surface 6A of the fitting hole 6, which is the joining portion, the stainless steel part The bondability in brazing to 2 becomes very high. That is, since surface oxide is less likely to form on the surface of the nickel plating layer, the surface oxide does not impede bonding. For this reason, it is considered that the bondability in brazing the ductile cast iron part 1 and the stainless steel part 2 is rather higher than in the case where the stainless steel parts are joined together.
　以上のように、本実施形態のダクタイル鋳鉄部品１は、ダクタイル鋳鉄の鋳造により形成されたダクタイル鋳鉄部品本体１０と、ダクタイル鋳鉄部品本体１０の表面上に直接形成された二重のニッケルメッキ層（第１ニッケルメッキ層１１及び第２ニッケルメッキ層１２）を備えているので、ステンレス鋼製の部品の実用的な代替品となり得る。すなわち、ダクタイル鋳鉄は、安価である一方で、ステンレス鋼と比較しても十分な強度を有している。また、ダクタイル鋳鉄の鋳造により、複雑な形状をした部品も、高い自由度で形成し得る。したがって、ダクタイル鋳鉄部品１は、安価でありながら、十分に高い機械的強度と所望の形状を有するものとできる。 As described above, the ductile cast iron part 1 of the present embodiment includes the ductile cast iron part main body 10 formed by casting the ductile cast iron and the double nickel plating layer ( With the first nickel-plated layer 11 and the second nickel-plated layer 12), it can be a practical replacement for stainless steel parts. That is, ductile cast iron is inexpensive and has sufficient strength compared to stainless steel. In addition, by casting ductile cast iron, parts having complicated shapes can be formed with a high degree of freedom. Therefore, the ductile cast iron part 1 can be inexpensive, yet have sufficiently high mechanical strength and a desired shape.
　また、ダクタイル鋳鉄部品１の表面には、二重のニッケルメッキ層１１、１２が備えられているので、ダクタイル鋳鉄部品１とステンレス鋼部品２のロウ付けにおける接合性が高められるという作用効果ももたらされる。また、表面がニッケルメッキ層であるダクタイル鋳鉄部品１の外観は、ステンレス鋼製の製品と類似したものとできる。さらに、ニッケルメッキ層は、ダクタイル鋳鉄部品本体１０の表面上に直接形成されるので、銅下等の介在物がない分、低コストで形成することができる。 In addition, since the surface of the ductile cast iron part 1 is provided with the double nickel plating layers 11 and 12, there is also the effect of enhancing the bondability in brazing the ductile cast iron part 1 and the stainless steel part 2. be In addition, the appearance of the ductile cast iron component 1 having a nickel-plated surface can be made similar to a product made of stainless steel. Furthermore, since the nickel plating layer is formed directly on the surface of the ductile cast iron part main body 10, it can be formed at a low cost because there is no inclusion such as under copper.
　したがって、本実施形態のダクタイル鋳鉄部品１によれば、ステンレス鋼（例えばＳＵＳ３０４）からなる製品の代替品として、機械的強度等において十分な性能を有し、外観においても違和感のない代替品を、低コストで提供することができる。また、ダクタイル鋳鉄部品１をステンレス鋼部品２と組み合わせて組み立て部品３を構成する場合には、ダクタイル鋳鉄部品１とステンレス鋼部品２のロウ付けにおける接合性が非常に高いものとなるので、適切に接合された高品質な組み立て品３を、低コストで提供することができる。 Therefore, according to the ductile cast iron part 1 of the present embodiment, as a substitute for a product made of stainless steel (for example, SUS304), it has sufficient performance in terms of mechanical strength and the like, and has a comfortable appearance. It can be provided at low cost. In addition, when the ductile cast iron part 1 is combined with the stainless steel part 2 to form the assembly part 3, the brazing bondability between the ductile cast iron part 1 and the stainless steel part 2 is very high. A high quality joined assembly 3 can be provided at low cost.
　次に、本実施形態におけるダクタイル鋳鉄部品１の製造方法について、詳細に説明する。ダクタイル鋳鉄部品１の製造においては、まず、所望の形状のダクタイル鋳鉄部品本体１０を、ダクタイル鋳鉄（例えばＦＣＤ４５０）の鋳造により形成する。 Next, a method for manufacturing the ductile cast iron part 1 according to this embodiment will be described in detail. In manufacturing the ductile cast iron component 1, first, a ductile cast iron component body 10 having a desired shape is formed by casting ductile cast iron (for example, FCD450).
　続いて、ダクタイル鋳鉄部品本体１０の表面に対して切削処理を施し、表面酸化物を除去する。表面酸化物を除去する処理が終了したら、ダクタイル鋳鉄部品本体１０の表面を入念に洗浄し、表面上に直接ニッケルメッキを施すことができる状態にする。 Subsequently, the surface of the ductile cast iron part main body 10 is subjected to cutting treatment to remove surface oxides. After the surface oxide removal process is completed, the surface of the ductile cast iron component body 10 is thoroughly cleaned and ready for direct nickel plating thereon.
　以上のような下処理に続いて、ダクタイル鋳鉄部品本体１０の表面全体に対して、直接ニッケルメッキを施すことにより、第１ニッケルメッキ層１１を形成する。第１ニッケルメッキ層１１が形成されたならば、２回目のニッケルメッキ処理を行い、第１ニッケルメッキ層１１の上に第２ニッケルメッキ層１２を形成して、ダクタイル鋳鉄部品本体１０の表面にニッケルメッキ層１１、１２を備えたダクタイル鋳鉄部品１を形成する。 Following the pretreatment as described above, the entire surface of the ductile cast iron component main body 10 is directly plated with nickel to form the first nickel plating layer 11 . After the first nickel plating layer 11 is formed, a second nickel plating process is performed to form a second nickel plating layer 12 on the first nickel plating layer 11 to form the second nickel plating layer 12 on the surface of the ductile cast iron part main body 10. A ductile cast iron part 1 with nickel plating layers 11, 12 is formed.
　以上のように、ダクタイル鋳鉄部品１が形成されたのち、ニッケルメッキ処理の後処理として、ダクタイル鋳鉄部品１に熱処理を施す。詳しくは、ダクタイル鋳鉄部品１を、１８０℃～２００℃（少なくとも１００℃以上）の加熱炉内に配置し、４時間以上（好ましくは５時間以上）にわたって加熱処理を行う。このような後熱処理を施すことにより、ダクタイル鋳鉄部品本体１０とニッケルメッキ層１１、１２の密着性を高めることができ、ダクタイル鋳鉄部品１とステンレス鋼部品２の連結のためのロウ付けの際に、ニッケルメッキ層１１、１２が剥離してしまうことや膨れてしまうことを適切に防止することができる。 After the ductile cast iron part 1 is formed as described above, the ductile cast iron part 1 is subjected to heat treatment as a post-treatment of the nickel plating treatment. Specifically, the ductile cast iron part 1 is placed in a heating furnace at 180° C. to 200° C. (at least 100° C. or higher) and heat-treated for 4 hours or longer (preferably 5 hours or longer). By performing such a post-heat treatment, the adhesion between the ductile cast iron part main body 10 and the nickel plating layers 11 and 12 can be enhanced, and when brazing for connecting the ductile cast iron part 1 and the stainless steel part 2, , the nickel plating layers 11 and 12 can be appropriately prevented from being peeled off and swollen.
　詳しく説明すると、ダクタイル鋳鉄部品本体１０は、ダクタイル鋳鉄を鋳造して形成されるものであるので、ダクタイル鋳鉄部品本体１０の生地内には、各種ガス（例えば水素ガス）が封じ込められた状態になっている。このため、ダクタイル鋳鉄部品１をステンレス鋼部品２にロウ付けするときの高温下では、ダクタイル鋳鉄部品本体１０とニッケルメッキ層１１、１２の間にガスが発生することがある。このようなガスの発生により、ニッケルメッキ層１１、１２がダクタイル鋳鉄部品本体１０から剥がれる現象や、水膨れのように膨らんだ状態となってしまう現象が生じる。なお、このような現象は、複数のダクタイル鋳鉄部品１を製造するときに、ある程度の割合で生じてくるもので、例えばニッケルメッキを施す際のメッキ槽内での位置の相違や、各個体の出来不出来等に起因すると考えられる。 More specifically, since the ductile cast iron component body 10 is formed by casting ductile cast iron, various gases (for example, hydrogen gas) are enclosed in the texture of the ductile cast iron component body 10. ing. Therefore, gas may be generated between the ductile cast iron part body 10 and the nickel plating layers 11 and 12 at high temperatures when the ductile cast iron part 1 is brazed to the stainless steel part 2 . Such generation of gas causes a phenomenon in which the nickel plating layers 11 and 12 are peeled off from the ductile cast iron component main body 10, and a phenomenon in which the nickel plating layers 11 and 12 are swollen like water blisters. Such a phenomenon occurs at a certain rate when a plurality of ductile cast iron parts 1 are manufactured. It is thought that this is due to factors such as success.
　そこで、本発明では、ニッケルメッキ層形成の後処理として、ダクタイル鋳鉄部品１に所定の熱処理を施すことにより、ダクタイル鋳鉄部品本体１０とニッケルメッキ層１１、１２の間からガス（特に水素ガス）を除去して、ダクタイル鋳鉄部品本体１０とニッケルメッキ層１１、１２の密着性を高める。これにより、ダクタイル鋳鉄部品１においてニッケルメッキ層１１、１２の剥離や膨れが生じてしまうことを効果的に抑制でき、複数のダクタイル鋳鉄部品１を製造する場合でも、おしなべて高品質のダクタイル鋳鉄部品１を提供することができる。 Therefore, in the present invention, as a post-treatment for forming the nickel plating layer, the ductile cast iron part 1 is subjected to a predetermined heat treatment to remove gas (especially hydrogen gas) from between the ductile cast iron part main body 10 and the nickel plating layers 11 and 12. By removing it, the adhesion between the ductile cast iron part main body 10 and the nickel plating layers 11 and 12 is enhanced. As a result, it is possible to effectively suppress the occurrence of peeling and swelling of the nickel plating layers 11 and 12 in the ductile cast iron part 1, and even when manufacturing a plurality of ductile cast iron parts 1, the ductile cast iron parts 1 are generally of high quality. can be provided.
　なお、一般に、メッキ処理においては、メッキを施した後の後処理として、水素脆性（水素による素材の脆弱化）を解消するための熱処理（ベーキング）が行われることがある。この点、本発明における熱処理も、メッキ処理の後処理として実行されるものではあるが、一般のメッキ処理に伴って実施されるベーキングとは趣旨が異なるものである。すなわち、従来技術におけるベーキングは、あくまで水素脆性解消のために実施されるものであるのに対して、本発明における熱処理は、特に、ダクタイル鋳鉄部品本体１０の表面に銅下等の介在物なしに直接ニッケルメッキ層１１、１２を形成した構成において、ダクタイル鋳鉄部品本体１０とニッケルメッキ層１１、１２の密着性を高めるために実施されるものであり、従来技術とは処理の目的が全く異なるものである。 In general, in plating, heat treatment (baking) may be performed as a post-treatment after plating to eliminate hydrogen embrittlement (material weakening due to hydrogen). In this regard, although the heat treatment in the present invention is also performed as a post-treatment after plating, it is different in purpose from baking that is performed along with general plating. That is, while the baking in the prior art is only performed to eliminate hydrogen embrittlement, the heat treatment in the present invention is particularly effective in removing inclusions such as copper on the surface of the ductile cast iron part main body 10. In the structure in which the nickel plating layers 11 and 12 are directly formed, this is performed to improve the adhesion between the ductile cast iron part body 10 and the nickel plating layers 11 and 12, and the purpose of the treatment is completely different from that of the conventional technology. is.
　以上、本発明の実施形態を説明してきたが、本発明は、上記実施形態の内容に限定されるものではない。例えば、本発明の適用されるダクタイル鋳鉄部品や組み立て部品は、上記実施形態におけるダクタイル鋳鉄部品１や組み立て部品３の具体的な形態に限られるものではない。本発明は、各種自動車部品をはじめとする様々な形態の機械製品に適用可能なものである。 Although the embodiments of the present invention have been described above, the present invention is not limited to the contents of the above embodiments. For example, the ductile cast iron part and the assembled part to which the present invention is applied are not limited to the specific forms of the ductile cast iron part 1 and the assembled part 3 in the above embodiment. INDUSTRIAL APPLICABILITY The present invention is applicable to various types of mechanical products including various automobile parts.
　また、ダクタイル鋳鉄部品とステンレス鋼部品を連結及び接合する形態も、上記実施形態における形態（挿入端部７の嵌合穴６への嵌合）に限定されない。本発明においては、ダクタイル鋳鉄部品とステンレス鋼部品の連結及び接合に関しても、任意の形態を採用し得る。 Also, the form of connecting and joining the ductile cast iron part and the stainless steel part is not limited to the form (fitting of the insertion end 7 into the fitting hole 6) in the above embodiment. In the present invention, any form of connection and joining of ductile cast iron parts and stainless steel parts may be employed.
　また、上記実施形態では、鉄としてダクタイル鋳鉄を採用し、ダクタイル鋳鉄を鋳造したダクタイル鋳鉄本体１０を用いてダクタイル鋳鉄部品１を形成する例を説明したが、本発明は、このような形態に限られるものではなく、ダクタイル鋳鉄以外の鉄を鋳造した鉄鋳物部品本体を用いて鉄鋳物部品を形成するようにしてもよい。 Further, in the above-described embodiment, an example in which ductile cast iron is used as the iron and the ductile cast iron body 10 is formed by casting the ductile cast iron to form the ductile cast iron component 1 has been described. Instead, the iron casting part may be formed using an iron casting part body cast from an iron other than ductile cast iron.
　本発明は、自動車部品等の各種機械製品およびその製造方法に広く利用することができる。 The present invention can be widely used for various mechanical products such as automobile parts and manufacturing methods thereof.
　１　ダクタイル鋳鉄部品
　２　ステンレス鋼部品
　３　組み立て部品
　４　ダクタイル鋳鉄部品の表面
　５　ダクタイル鋳鉄部品の裏面
　６　ダクタイル鋳鉄部品の嵌合穴
　６Ａ　嵌合穴の内周面
　７　ステンレス鋼部品の挿入端部
７A　挿入端部の外周面
１０　ダクタイル鋳鉄部品本体
１１　第１ニッケルメッキ層
１２　第２ニッケルメッキ層
１５　ロウ材 1 ductile cast iron part 2 stainless steel part 3 assembled part 4 surface of ductile cast iron part 5 back side of ductile cast iron part 6 fitting hole of ductile cast iron part 6A inner peripheral surface of fitting hole 7 insertion end 7A of stainless steel part insertion end Part outer peripheral surface 10 Ductile cast iron part main body 11 First nickel plating layer 12 Second nickel plating layer 15 Brazing material

Claims (11)

  1. 　鉄の鋳造により形成された鉄鋳物部品本体と、前記鉄鋳物部品本体上に直接形成されたニッケルメッキ層を備えた鉄鋳物部品。 An iron casting part body formed by casting iron and an iron casting part provided with a nickel plating layer formed directly on the iron casting part body.
  2. 　前記鉄鋳物部品は、ステンレス鋼から形成されたステンレス鋼部品と組み合わせて用いられるようになっており、前記ニッケルメッキ層は、前記鉄鋳物部品の少なくとも前記ステンレス鋼部品と接合される部分に形成されている請求項１に記載の鉄鋳物部品。 The cast iron part is designed to be used in combination with a stainless steel part made of stainless steel, and the nickel plating layer is formed on at least a portion of the cast iron part that is joined to the stainless steel part. An iron casting part according to claim 1.
  3. 　前記鉄鋳物部品は、前記ステンレス鋼部品の少なくとも一部が嵌合する嵌合穴を備えており、
    　前記ニッケルメッキ層は、少なくとも前記嵌合穴の内周面上に形成されている請求項２に記載の鉄鋳物部品。     The iron casting part has a fitting hole into which at least a part of the stainless steel part fits,
    3. The iron casting part according to claim 2, wherein said nickel plating layer is formed at least on the inner peripheral surface of said fitting hole.
  4. 　前記ニッケルメッキ層は、複数層が重ねて形成されている請求項１から請求項３のいずれか１項に記載の鉄鋳物部品。 The cast iron component according to any one of claims 1 to 3, wherein the nickel plating layer is formed by stacking a plurality of layers.
  5. 　前記鉄鋳物部品は、ダクタイル鋳鉄の鋳造により形成されたダクタイル鋳鉄部品本体を前記鉄鋳物部品本体として備えるとともに、前記ダクタイル鋳鉄部品本体上に直接形成されたニッケルメッキ層を備えたダクタイル鋳鉄部品である請求項１に記載の鉄鋳物部品。 The iron casting part is a ductile cast iron part having a ductile cast iron part body formed by casting ductile cast iron as the iron casting part body and a nickel plating layer formed directly on the ductile cast iron part body. An iron casting part according to claim 1.
  6. 　鉄鋳物部品とステンレス鋼部品を組み合わせて形成される組み立て部品において、
    　前記鉄鋳物部品は、鉄の鋳造により形成された鉄鋳物部品本体と、前記鉄鋳物部品本体上に直接形成されたニッケルメッキ層を備え、
    　前記鉄鋳物部品と前記ステンレス鋼部品は、ロウ付けにより接合されている組み立て部品。     In assembly parts formed by combining iron casting parts and stainless steel parts,
    The iron casting part comprises an iron casting part body formed by casting iron and a nickel plating layer formed directly on the iron casting part body,
    An assembled part in which the cast iron part and the stainless steel part are joined by brazing.
  7. 　前記鉄鋳物部品は、ダクタイル鋳鉄の鋳造により形成されたダクタイル鋳鉄部品本体を前記鉄鋳物部品本体として備えるとともに、前記ダクタイル鋳鉄部品本体上に直接形成されたニッケルメッキ層を備えたダクタイル鋳鉄部品である請求項６に記載の組み立て部品。 The iron casting part is a ductile cast iron part having a ductile cast iron part body formed by casting ductile cast iron as the iron casting part body and a nickel plating layer formed directly on the ductile cast iron part body. Assembly according to claim 6.
  8. 　鉄鋳物から形成された鉄鋳物部品本体と、前記鉄鋳物部品本体上に形成されたニッケルメッキ層を備えた鉄鋳物部品を製造する鉄鋳物部品の製造方法において、
    　前記鉄鋳物部品本体を鉄の鋳造により形成する工程と、
    　前記鉄鋳物部品本体の表面酸化物を除去する工程と、
    　表面酸化物が除去された前記鉄鋳物部品本体を洗浄する工程と、
    　洗浄後の前記鉄鋳物部品本体上に直接ニッケルメッキを施す工程と
    を備えた鉄鋳物部品の製造方法。     In a method for manufacturing an iron casting part comprising an iron casting part body formed from an iron casting and a nickel plating layer formed on the iron casting part body,
    forming the cast iron component body by casting iron;
    removing surface oxides from the iron casting component body;
    cleaning the cast iron component body from which surface oxides have been removed;
    and directly nickel-plating the body of the cast iron part after cleaning.
  9. 　前記ニッケルメッキを施す工程の後処理として、前記鉄鋳物部品に熱処理を施す工程を備えた請求項８に記載の鉄鋳物部品の製造方法。 The method for manufacturing an iron casting part according to claim 8, comprising a step of subjecting the iron casting part to a heat treatment as a post-treatment of the nickel plating step.
  10. 　前記熱処理は、前記鉄鋳物部品を、１８０℃～２２０℃の加熱炉内で４時間以上にわたって加熱する処理である請求項９に記載の鉄鋳物部品の製造方法。 The method for manufacturing an iron casting part according to claim 9, wherein the heat treatment is a treatment of heating the iron casting part in a heating furnace at 180°C to 220°C for 4 hours or longer.
  11. 　前記鉄鋳物部品は、ダクタイル鋳鉄の鋳造により形成されたダクタイル鋳鉄部品本体を前記鉄鋳物部品本体として備えるとともに、前記ダクタイル鋳鉄部品本体上に直接形成されたニッケルメッキ層を備えたダクタイル鋳鉄部品である請求項８に記載の鉄鋳物部品の製造方法。

          The iron casting part is a ductile cast iron part having a ductile cast iron part body formed by casting ductile cast iron as the iron casting part body and having a nickel plating layer formed directly on the ductile cast iron part body. A method for manufacturing an iron casting part according to claim 8.
PCT/JP2022/045037 2021-12-15 2022-12-07 Iron cast part, assembly part, and method for manufacturing iron cast part WO2023112788A1 (en)

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JPH11199921A (en) * 1998-01-08 1999-07-27 Nissan Motor Co Ltd Method for welding ductile cast iron and stainless steel and welding structure thereof
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JP2000334554A (en) * 1999-05-26 2000-12-05 Toshiba Mach Co Ltd Plunger sleeve for die casting machine
JP2004143552A (en) * 2002-10-25 2004-05-20 Aisan Ind Co Ltd Cast iron components and method for plating the same
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6072657A (en) * 1983-09-28 1985-04-24 Toshiba Mach Co Ltd Method for manufacturing member of molding machine or the like and member manufactured by using said method
JPH03130390A (en) * 1989-10-15 1991-06-04 Nomura Techno Res Kk Production of cast iron having chrome plating coating film
JPH11199921A (en) * 1998-01-08 1999-07-27 Nissan Motor Co Ltd Method for welding ductile cast iron and stainless steel and welding structure thereof
WO2000018537A1 (en) * 1998-09-28 2000-04-06 Sumitomo Special Metals Co., Ltd. Brazing filler alloy for stainless steel, brazed structure manufactured by using the brazing filler alloy, and brazing filler material for stainless steel
JP2000334554A (en) * 1999-05-26 2000-12-05 Toshiba Mach Co Ltd Plunger sleeve for die casting machine
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