WO2023112788A1 - 鉄鋳物部品、組み立て部品及び鉄鋳物部品の製造方法 - Google Patents

鉄鋳物部品、組み立て部品及び鉄鋳物部品の製造方法 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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WO
WIPO (PCT)
Prior art keywords
iron
cast iron
casting
ductile cast
nickel plating
Prior art date
Application number
PCT/JP2022/045037
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English (en)
French (fr)
Japanese (ja)
Inventor
龍太郎 今泉
周 加藤
Original Assignee
株式会社ファインスティールエンジニアリング
Priority date (The priority date 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 date listed.)
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Application filed by 株式会社ファインスティールエンジニアリング filed Critical 株式会社ファインスティールエンジニアリング
Priority to JP2023567723A priority Critical patent/JPWO2023112788A1/ja
Publication of WO2023112788A1 publication Critical patent/WO2023112788A1/ja

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Classifications

    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
PCT/JP2022/045037 2021-12-15 2022-12-07 鉄鋳物部品、組み立て部品及び鉄鋳物部品の製造方法 WO2023112788A1 (ja)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6072657A (ja) * 1983-09-28 1985-04-24 Toshiba Mach Co Ltd 射出成形機あるいは押出成形機等の加熱シリンダ製作方法およびこれを用いて製作した加熱シリンダ
JPH03130390A (ja) * 1989-10-15 1991-06-04 Nomura Techno Res Kk クロムめっき被覆を有する鋳鉄の製造方法
JPH11199921A (ja) * 1998-01-08 1999-07-27 Nissan Motor Co Ltd ダクタイル鋳鉄とステンレス鋼の溶接方法および溶接構造
WO2000018537A1 (fr) * 1998-09-28 2000-04-06 Sumitomo Special Metals Co., Ltd. Alliage de metaux d'apport de brasage pour structure brasee en acier inoxydable, et metal d'apport de brasage pour acier inoxydable
JP2000334554A (ja) * 1999-05-26 2000-12-05 Toshiba Mach Co Ltd ダイカストマシン用プランジャスリーブ
JP2004143552A (ja) * 2002-10-25 2004-05-20 Aisan Ind Co Ltd 鋳鉄部品とそのめっき方法
JP2005256765A (ja) * 2004-03-12 2005-09-22 Aisan Ind Co Ltd 内燃機関の排気制御装置
JP2013059748A (ja) * 2011-09-14 2013-04-04 Kakiuchi:Kk 造粒機用ダイス及びその製造方法
WO2022148744A1 (en) * 2021-01-05 2022-07-14 Pfeiffer Vacuum Dry vacuum pump and method of manufacture

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6072657A (ja) * 1983-09-28 1985-04-24 Toshiba Mach Co Ltd 射出成形機あるいは押出成形機等の加熱シリンダ製作方法およびこれを用いて製作した加熱シリンダ
JPH03130390A (ja) * 1989-10-15 1991-06-04 Nomura Techno Res Kk クロムめっき被覆を有する鋳鉄の製造方法
JPH11199921A (ja) * 1998-01-08 1999-07-27 Nissan Motor Co Ltd ダクタイル鋳鉄とステンレス鋼の溶接方法および溶接構造
WO2000018537A1 (fr) * 1998-09-28 2000-04-06 Sumitomo Special Metals Co., Ltd. Alliage de metaux d'apport de brasage pour structure brasee en acier inoxydable, et metal d'apport de brasage pour acier inoxydable
JP2000334554A (ja) * 1999-05-26 2000-12-05 Toshiba Mach Co Ltd ダイカストマシン用プランジャスリーブ
JP2004143552A (ja) * 2002-10-25 2004-05-20 Aisan Ind Co Ltd 鋳鉄部品とそのめっき方法
JP2005256765A (ja) * 2004-03-12 2005-09-22 Aisan Ind Co Ltd 内燃機関の排気制御装置
JP2013059748A (ja) * 2011-09-14 2013-04-04 Kakiuchi:Kk 造粒機用ダイス及びその製造方法
WO2022148744A1 (en) * 2021-01-05 2022-07-14 Pfeiffer Vacuum Dry vacuum pump and method of manufacture

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