US20120118746A1 - Method of manufacturing fuel system part and fuel system part - Google Patents
Method of manufacturing fuel system part and fuel system part Download PDFInfo
- Publication number
- US20120118746A1 US20120118746A1 US13/291,207 US201113291207A US2012118746A1 US 20120118746 A1 US20120118746 A1 US 20120118746A1 US 201113291207 A US201113291207 A US 201113291207A US 2012118746 A1 US2012118746 A1 US 2012118746A1
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- United States
- Prior art keywords
- fuel
- crude metal
- nickel
- paint film
- metal
- 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.)
- Abandoned
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 107
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 65
- 229910052751 metal Inorganic materials 0.000 claims abstract description 65
- 238000007747 plating Methods 0.000 claims abstract description 44
- OFNHPGDEEMZPFG-UHFFFAOYSA-N phosphanylidynenickel Chemical compound [P].[Ni] OFNHPGDEEMZPFG-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000003973 paint Substances 0.000 claims abstract description 38
- 239000011248 coating agent Substances 0.000 claims abstract description 15
- 238000000576 coating method Methods 0.000 claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 9
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 238000003754 machining Methods 0.000 claims abstract description 7
- 229910052755 nonmetal Inorganic materials 0.000 claims abstract description 7
- 238000007772 electroless plating Methods 0.000 claims abstract description 3
- 238000004070 electrodeposition Methods 0.000 claims description 5
- 150000001768 cations Chemical class 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 14
- 239000002828 fuel tank Substances 0.000 description 8
- 230000000873 masking effect Effects 0.000 description 8
- 229910052759 nickel Inorganic materials 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005553 drilling Methods 0.000 description 4
- 239000002551 biofuel Substances 0.000 description 3
- 238000005242 forging Methods 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000010953 base metal Substances 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000007592 spray painting technique Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Images
Classifications
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- 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
- C23C18/54—Contact plating, i.e. electroless electrochemical plating
-
- 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
- C23C18/1601—Process or apparatus
- C23C18/1603—Process or apparatus coating on selected surface areas
- C23C18/1607—Process or apparatus coating on selected surface areas by direct patterning
- C23C18/1608—Process or apparatus coating on selected surface areas by direct patterning from pretreatment step, i.e. selective pre-treatment
-
- 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
- C23C18/1601—Process or apparatus
- C23C18/1633—Process of electroless plating
- C23C18/1646—Characteristics of the product obtained
-
- 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
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/04—Electrophoretic coating characterised by the process with organic material
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D9/00—Electrolytic coating other than with metals
- C25D9/02—Electrolytic coating other than with metals with organic materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
- F02M37/0017—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor related to fuel pipes or their connections, e.g. joints or sealings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0047—Layout or arrangement of systems for feeding fuel
- F02M37/0064—Layout or arrangement of systems for feeding fuel for engines being fed with multiple fuels or fuels having special properties, e.g. bio-fuels; varying the fuel composition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/166—Selection of particular materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
- F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
- F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/08—Coatings characterised by the materials used by metal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
- F16L58/1072—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being a sprayed layer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
- F02M2200/8069—Fuel injection apparatus manufacture, repair or assembly involving removal of material from the fuel apparatus, e.g. by punching, hydro-erosion or mechanical operation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/90—Selection of particular materials
- F02M2200/9038—Coatings
Definitions
- the present invention relates to: a method of manufacturing a fuel system part; and the fuel system part.
- a known fuel delivery pipe having a fuel path is one of fuel system parts for internal combustion.
- a surface on the fuel path is plated with nickel-phosphorus etc.
- nickel-phosphorus plating is used for protecting a wall surface defining a fuel path against corrosion by alcohol-mixed fuel such as biofuel.
- the outer surface of the fuel delivery pipe is rust proofed as a countermeasure against salt corrosion.
- a crude metal 1 is cut out from a forged iron rod (a forging cutting step).
- the crude metal 1 is drilled through its axis such that a round bore 2 is formed inside the crude metal 1 (a machining step).
- the crude metal 1 with the round bore 2 is impregnated in nickel-phosphorus plating solution and is electroless plated.
- a nickel-phosphorus plating layer 3 is formed both on an inner periphery of the round bore 2 and on the outer periphery of the crude metal 1 (a nickel-phosphorus plating step).
- rubber plugs 4 are fitted tightly into opening ends of the crude metal 1 to prevent paint from entering the inside of the crude metal 1 .
- a fuel delivery pipe 6 having the nickel-phosphorus plating layer 3 on the inner periphery of the crude metal 1 and the paint film 5 on the outer periphery of the crude metal 1 is manufactured.
- the fuel delivery pipe 6 has four layers including the nickel-phosphorus plating layer 3 , the crude metal 1 , the nickel-phosphorus plating layer 3 , and the paint film 5 , in that order from the fuel path 7 . That is, two nickel-phosphorus plating layers 3 are necessarily formed on the fuel delivery pipe 6 . However, the nickel-phosphorus layer plating 3 on the periphery that does not contact fuel is needless. Therefore, while nickel is one of rare metals, a larger quantity of nickel is required. Furthermore, the fuel path 7 needs to be sealed with the rubber plugs 4 before the outer periphery is coated with the paint film 5 . That is, an extra step (the masking step) is needed prior to the outer-surface coating step. Therefore, reduction in use of nickel and, further, avoiding the masking step are important problems for reducing the cost of manufacturing the fuel delivery pipe 6 .
- An illustrative aspect of the present invention is a method of manufacturing a fuel system part.
- the fuel system part includes a crude metal made of forged iron, a nickel-phosphorus plating layer formed on an inner surface of the crude metal, and a nonmetal paint film formed on an outer surface of the crude metal.
- the method includes the steps of: coating the outer surface of the crude metal with paint to form the paint film; machining the crude metal with the paint film formed thereon to form a machined surface inside the crude metal; and electroless plating the machined crude metal in nickel-phosphorus plating solution to form the nickel-phosphorus plating layer on the machined surface.
- the fuel system part may be any one of: a fuel tank, a fuel pipe from the fuel tank to an internal combustion, a fuel delivery pipe for delivering fuel to a plurality of injectors, etc.
- a fuel system part any part having a contact surface to contact fuel is the fuel system part.
- the fuel is not limited to alcohol-mixed fuel that is so-called biofuel; the fuel may be either alcohol fuel or non-alcohol fuel.
- the crude metal is coated with the nonmetal film and, thereafter, is machined to form the machined surface. Accordingly, the nickel-phosphorus plating layer is formed only on the machined surface. Therefore, no masking step is needed. Furthermore, because the number of the formed nickel-phosphorus plating layer is only one, a less quantity of nickel is needed. As a result, the fuel system part can be manufactured at lower cost.
- a forged surface of a forging (the surface will hereinafter be referred to as a “crude-metal forged surface”) has a surface roughness larger than that of a machined surface. Accordingly, the crude-metal forged surface has a surface area greater than that of the machined surface. Therefore, if the crude-metal forged surface and the machined surface are plated in same conditions, the crude-metal forged surface has a less plating thickness. Furthermore, the crude-metal forged surface more easily forms an oxide film etc. This considerably affects oxidation-reduction reaction that occurs at an interface between plating solution during plating. With the above-described manufacturing method, in contrast, the nickel-phosphorus plating layer is formed only on the machined surface. Therefore, a plating film having a uniform thickness and little pinholes can be formed in the nickel-phosphorus plating step.
- FIG. 1 is a perspective view illustrating a configuration of fuel system parts of an embodiment
- FIG. 2 is a front view illustrating a fuel delivery pipe
- FIG. 3 is a plan view illustrating the fuel delivery pipe
- FIG. 4 is a longitudinal sectional view illustrating an inner configuration of the fuel delivery pipe
- FIG. 5 is a flowchart illustrating a method of manufacturing the fuel delivery pipe of the embodiment
- FIG. 6 is a simplified sectional view illustrating the method of the fuel delivery pipe of the embodiment.
- FIG. 7 is an enlarged partial sectional view illustrating the fuel delivery pipe completed in FIG. 6 ;
- FIG. 8 is a flowchart illustrating a conventional method of manufacturing a fuel delivery pipe
- FIG. 9 is a simplified sectional view illustrating the conventional method of manufacturing the fuel delivery pipe.
- FIG. 10 is an enlarged partial sectional view illustrating the fuel delivery pipe completed in FIG. 9 .
- FIG. 1 is a perspective view illustrating the fuel system parts mounted to a vehicle body 11 of a vehicle 10 .
- the fuel system parts are parts that have respective contact surfaces that contact fuel between a fuel tank 12 and an engine 13 .
- the fuel system parts are configured by the fuel tank 12 , a fuel supply pump 14 , a fuel transfer pipe P 1 , a fuel transfer pipe P 2 , a fuel return pipe P 3 , a filter 15 , a pressure regulator 16 , etc.
- the fuel tank 12 is disposed in a rear area in the vehicle body 11 .
- the engine 13 is disposed in a front area in the vehicle body 11 .
- the fuel supply pump 14 is disposed in the fuel tank 12 and pressurizes fuel to pump it to the engine 13 .
- the fuel pressurized by the fuel supply pump 14 is transferred through the fuel transfer pipe P 1 from the fuel tank 12 toward the engine 13 .
- the fuel transferred through the fuel transfer pipe P 1 is filtered by the filter 15 .
- the filtered fuel is passed through the pressure regulator 16 and the fuel transfer pipe P 2 and is supplied to the fuel delivery pipe 20 .
- the pressure regulator 16 regulates pressure of the fuel to be supplied to the fuel delivery pipe 20 at a predetermined pressure.
- the fuel referred to in this embodiment is so-called biofuel etc., which is alcohol fuel that contains alcohol. Because the alcohol-mixed fuel is metal corrosive, each fuel system part for use with the fuel is generally nickel-phosphorus plated as a countermeasure against corrosion. On the other hand, the outer periphery of the fuel system part is rust proofed as a countermeasure against salt corrosion. In this embodiment, the outer periphery of the fuel delivery pipe 20 is rust proofed by coating with nonmetal paint, which forms a paint film 40 . This will be described later.
- the fuel delivery pipe 20 includes a pipe body 21 having a cylindrical shape. As illustrated in FIG. 3 , a plurality of bolt connecting portions 22 project laterally from the pipe body 21 . The bolt connecting portions 22 are arranged at equal intervals along the length of the pipe body 21 . Each bolt connecting portion 22 has a bolt hole 22 A therethrough so as to allow a bolt (not shown) to be inserted therein.
- a plurality of injector connecting portions 24 for connecting respective injectors 23 extend from the pipe body 21 .
- the injector connecting portions 24 are arranged close to the respective bolt connecting portions 22 .
- each injector connecting portion 24 has a cylindrical shape with a hollow therein.
- the hollow of the injector connecting portion 24 has a downwardly opening end and an end communicating with a fuel path 21 A.
- the fuel path 21 A runs through the axis of the pipe body 21 .
- FIGS. 6 and 7 are simplified sectional views illustrating the fuel delivery pipe 20 , wherein the bolt connecting portions 22 and the injector connecting portions 24 are not illustrated.
- a crude metal 30 made of a forged iron configures most of the fuel delivery pipe 20 .
- the crude metal 30 is formed of a forged iron rod as a base metal. As illustrated in FIG. 6 , the rod is cut to a desired length so that a core metal 31 having a columnar shape is provided (a forging cutting step in FIG. 5 ).
- the core metal 31 is phosphatized.
- the phosphatized core metal 31 is then impregnated in epoxy resin electrodeposition paint and is cationically electrodeposited.
- the outer periphery of the core metal 31 is directly coated with the paint film 40 (an outer-periphery coating step in FIG. 5 ). Because the outer periphery of the core metal 31 is a forged surface, the outer periphery is difficult to plate than a surface of a pressed sheet metal. Therefore, the cation electrodeposition coating is adopted in this embodiment. As a result of this, the paint film 40 having a greater and uniform thickness, good adhesion properties, and little pinholes is formed.
- the paint film 40 is a resinous (nonmetal) film formed by the epoxy resin paint, no nickel-phosphorus plating layer 50 is formed on the paint film 40 even if the paint film 40 is not masked in a nickel-phosphorus plating step.
- the nickel-phosphorus plating step will be described later.
- the core metal 31 is drilled through its axis so that an open-ended bore 32 is formed throughout the inside of the core metal 31 .
- the crude metal 30 having the open-ended bore 32 is provided (a machining step in FIG. 5 ).
- the crude metal 30 has a wall that defines the open-ended bore 32 . Because this wall is a machined surface 33 formed by drilling, the wall is easier to plate than a forged surface. Therefore, a plating film having a uniform thickness and little pinholes is provided in the nickel-phosphorus plating step.
- the nickel-phosphorus step will be described below.
- the thickness of the paint film 40 is set at a thickness not to be pealed off even if the core metal 31 is fixedly held with a clamp etc. in the drilling. Specifically, the paint film 40 is approximately 10 to 20 ⁇ m thick. A measuring method by an electromagnetic thickness tester, a method of measuring masking step levels, etc. may be adopted to measure the film thickness.
- the crude metal 30 is impregnated in nickel-phosphorus plating solution and then is electroless plated.
- a nickel-phosphorus plating layer 50 is formed on the machined surface 33 (a nickel-phosphorus plating step in FIG. 5 ).
- the nickel-phosphorus plating layer 50 should be 8 to 30 ⁇ m thick. More preferably, the nickel-phosphorus plating layer 50 should be 10 to 20 ⁇ m thick.
- a measuring method by an electromagnetic thickness tester, a method of measuring masking step levels, etc. may be adopted to measure the layer thickness. Because no nickel-phosphorus plating layer 50 is formed on the paint film 40 as described above, the nickel-phosphorus plating layer 50 is formed only on the machined surface 33 . By these steps, the fuel delivery pipe 20 is completed.
- the crude metal 30 has the fuel path 21 A formed therein.
- the nickel-phosphorus plating layer 50 configures the inner periphery defining the fuel path 21 A.
- the fuel delivery pipe 20 manufactured by the above-described steps has three layers composed of the nickel-phosphorus plating layer 50 , the crude metal 30 , and the paint film 40 , in that order from the fuel path 21 A.
- the nickel-phosphorus plating layer 50 is formed only on the portion that contacts the fuel passing through the fuel path 21 A. Because of this, while nickel is one of rare metals, the fuel delivery pipe 20 needs a significantly less quantity of nickel. Furthermore, because the paint film 40 functions as a mask, no masking step is needed. As a result, the fuel delivery pipe 20 can be manufactured at lower cost.
- the method of manufacturing the fuel delivery pipe 20 is illustrated as a method of manufacturing a fuel system part. According to the present invention, the present invention may be adopted in a method of manufacturing the fuel tank 12 , the fuel transfer pipe P 1 , P 2 , the fuel return pipe P 3 , etc.
- the drilling is illustrated as the machining. According to the present invention, boring may be adopted in the machining.
- the cation electrodeposition coating is adopted in coating the crude metal 30 with the paint film 40 .
- spray painting etc. may be adopted in forming a paint film.
- the shape of the fuel delivery pipe 20 is specifically illustrated in FIGS. 2 through 4 .
- the fuel delivery pipe may have, for example, four injector connecting portions.
Abstract
Disclosed in the present application is a method of manufacturing a fuel delivery pipe. The fuel delivery pipe includes a crude metal made of forged iron, a nickel-phosphorus plating layer formed on an inner surface of the crude metal, and a nonmetal paint film formed on an outer surface of the crude metal. The method includes the steps of: coating the outer surface of the crude metal with paint to form the paint film; machining the crude metal with the paint film formed thereon to form a machined surface inside the crude metal; and electroless plating the machined crude metal in nickel-phosphorus plating solution to form the nickel-phosphorus plating layer on the machined surface.
Description
- This application claims priority from Japanese Patent Application No. 2010-254007 filed on Nov. 12, 2010. The entire content of this priority application is incorporated herein by reference.
- The present invention relates to: a method of manufacturing a fuel system part; and the fuel system part.
- A known fuel delivery pipe having a fuel path is one of fuel system parts for internal combustion. A surface on the fuel path is plated with nickel-phosphorus etc. In general, nickel-phosphorus plating is used for protecting a wall surface defining a fuel path against corrosion by alcohol-mixed fuel such as biofuel. On the other hand, the outer surface of the fuel delivery pipe is rust proofed as a countermeasure against salt corrosion. A known method of manufacturing such a fuel delivery pipe will hereinafter be illustrated with reference to
FIG. 8 through 10 . - First, a
crude metal 1 is cut out from a forged iron rod (a forging cutting step). Second, thecrude metal 1 is drilled through its axis such that around bore 2 is formed inside the crude metal 1 (a machining step). Third, thecrude metal 1 with theround bore 2 is impregnated in nickel-phosphorus plating solution and is electroless plated. By this plating, a nickel-phosphorus platinglayer 3 is formed both on an inner periphery of theround bore 2 and on the outer periphery of the crude metal 1 (a nickel-phosphorus plating step). Fourth,rubber plugs 4 are fitted tightly into opening ends of thecrude metal 1 to prevent paint from entering the inside of thecrude metal 1. That is, the inside of thecrude metal 1 is masked (a masking step). Finally, the outer periphery of thecrude metal 1 is coated with a paint film 5 (an outer-periphery coating step). Thus, afuel delivery pipe 6 having the nickel-phosphorus platinglayer 3 on the inner periphery of thecrude metal 1 and thepaint film 5 on the outer periphery of thecrude metal 1 is manufactured. - As illustrated in
FIG. 10 , thefuel delivery pipe 6 has four layers including the nickel-phosphorus plating layer 3, thecrude metal 1, the nickel-phosphorus plating layer 3, and thepaint film 5, in that order from thefuel path 7. That is, two nickel-phosphorus platinglayers 3 are necessarily formed on thefuel delivery pipe 6. However, the nickel-phosphorus layer plating 3 on the periphery that does not contact fuel is needless. Therefore, while nickel is one of rare metals, a larger quantity of nickel is required. Furthermore, thefuel path 7 needs to be sealed with therubber plugs 4 before the outer periphery is coated with thepaint film 5. That is, an extra step (the masking step) is needed prior to the outer-surface coating step. Therefore, reduction in use of nickel and, further, avoiding the masking step are important problems for reducing the cost of manufacturing thefuel delivery pipe 6. - Thus, there is a need for a fuel delivery pipe that needs less nickel and does not need the masking step, thereby reducing the manufacturing cost.
- An illustrative aspect of the present invention is a method of manufacturing a fuel system part. The fuel system part includes a crude metal made of forged iron, a nickel-phosphorus plating layer formed on an inner surface of the crude metal, and a nonmetal paint film formed on an outer surface of the crude metal. The method includes the steps of: coating the outer surface of the crude metal with paint to form the paint film; machining the crude metal with the paint film formed thereon to form a machined surface inside the crude metal; and electroless plating the machined crude metal in nickel-phosphorus plating solution to form the nickel-phosphorus plating layer on the machined surface.
- In the context of the present invention, the fuel system part may be any one of: a fuel tank, a fuel pipe from the fuel tank to an internal combustion, a fuel delivery pipe for delivering fuel to a plurality of injectors, etc. In other words, any part having a contact surface to contact fuel is the fuel system part. Furthermore, the fuel is not limited to alcohol-mixed fuel that is so-called biofuel; the fuel may be either alcohol fuel or non-alcohol fuel.
- With the manufacturing method, the crude metal is coated with the nonmetal film and, thereafter, is machined to form the machined surface. Accordingly, the nickel-phosphorus plating layer is formed only on the machined surface. Therefore, no masking step is needed. Furthermore, because the number of the formed nickel-phosphorus plating layer is only one, a less quantity of nickel is needed. As a result, the fuel system part can be manufactured at lower cost.
- In general, a forged surface of a forging (the surface will hereinafter be referred to as a “crude-metal forged surface”) has a surface roughness larger than that of a machined surface. Accordingly, the crude-metal forged surface has a surface area greater than that of the machined surface. Therefore, if the crude-metal forged surface and the machined surface are plated in same conditions, the crude-metal forged surface has a less plating thickness. Furthermore, the crude-metal forged surface more easily forms an oxide film etc. This considerably affects oxidation-reduction reaction that occurs at an interface between plating solution during plating. With the above-described manufacturing method, in contrast, the nickel-phosphorus plating layer is formed only on the machined surface. Therefore, a plating film having a uniform thickness and little pinholes can be formed in the nickel-phosphorus plating step.
-
FIG. 1 is a perspective view illustrating a configuration of fuel system parts of an embodiment; -
FIG. 2 is a front view illustrating a fuel delivery pipe; -
FIG. 3 is a plan view illustrating the fuel delivery pipe; -
FIG. 4 is a longitudinal sectional view illustrating an inner configuration of the fuel delivery pipe; -
FIG. 5 is a flowchart illustrating a method of manufacturing the fuel delivery pipe of the embodiment; -
FIG. 6 is a simplified sectional view illustrating the method of the fuel delivery pipe of the embodiment; -
FIG. 7 is an enlarged partial sectional view illustrating the fuel delivery pipe completed inFIG. 6 ; -
FIG. 8 is a flowchart illustrating a conventional method of manufacturing a fuel delivery pipe; -
FIG. 9 is a simplified sectional view illustrating the conventional method of manufacturing the fuel delivery pipe; and -
FIG. 10 is an enlarged partial sectional view illustrating the fuel delivery pipe completed inFIG. 9 . - An embodiment will be described with reference to
FIGS. 1 through 7 . An overall configuration of fuel system parts according to the present invention will first be described with reference toFIGS. 1 through 4 .FIG. 1 is a perspective view illustrating the fuel system parts mounted to avehicle body 11 of avehicle 10. The fuel system parts are parts that have respective contact surfaces that contact fuel between afuel tank 12 and anengine 13. Specifically, the fuel system parts are configured by thefuel tank 12, afuel supply pump 14, a fuel transfer pipe P1, a fuel transfer pipe P2, a fuel return pipe P3, afilter 15, apressure regulator 16, etc. - The
fuel tank 12 is disposed in a rear area in thevehicle body 11. Theengine 13 is disposed in a front area in thevehicle body 11. Thefuel supply pump 14 is disposed in thefuel tank 12 and pressurizes fuel to pump it to theengine 13. The fuel pressurized by thefuel supply pump 14 is transferred through the fuel transfer pipe P1 from thefuel tank 12 toward theengine 13. The fuel transferred through the fuel transfer pipe P1 is filtered by thefilter 15. The filtered fuel is passed through thepressure regulator 16 and the fuel transfer pipe P2 and is supplied to thefuel delivery pipe 20. Thepressure regulator 16 regulates pressure of the fuel to be supplied to thefuel delivery pipe 20 at a predetermined pressure. - The fuel referred to in this embodiment is so-called biofuel etc., which is alcohol fuel that contains alcohol. Because the alcohol-mixed fuel is metal corrosive, each fuel system part for use with the fuel is generally nickel-phosphorus plated as a countermeasure against corrosion. On the other hand, the outer periphery of the fuel system part is rust proofed as a countermeasure against salt corrosion. In this embodiment, the outer periphery of the
fuel delivery pipe 20 is rust proofed by coating with nonmetal paint, which forms apaint film 40. This will be described later. - As illustrated in
FIG. 2 , thefuel delivery pipe 20 includes apipe body 21 having a cylindrical shape. As illustrated inFIG. 3 , a plurality ofbolt connecting portions 22 project laterally from thepipe body 21. Thebolt connecting portions 22 are arranged at equal intervals along the length of thepipe body 21. Eachbolt connecting portion 22 has abolt hole 22A therethrough so as to allow a bolt (not shown) to be inserted therein. - A plurality of
injector connecting portions 24 for connectingrespective injectors 23 extend from thepipe body 21. Theinjector connecting portions 24 are arranged close to the respectivebolt connecting portions 22. As illustrated inFIG. 4 , eachinjector connecting portion 24 has a cylindrical shape with a hollow therein. The hollow of theinjector connecting portion 24 has a downwardly opening end and an end communicating with afuel path 21A. Thefuel path 21A runs through the axis of thepipe body 21. With these configurations, fuel is sent into thefuel path 21A, is delivered to theinjector connecting portions 24, and is injected into theengine 13 through theinjectors 23 connected to theinjector connecting portions 24. - Next, a method of manufacturing the
fuel delivery pipe 20 and an internal configuration thereof will be described with reference toFIGS. 5 through 7 .FIGS. 6 and 7 are simplified sectional views illustrating thefuel delivery pipe 20, wherein thebolt connecting portions 22 and theinjector connecting portions 24 are not illustrated. Acrude metal 30 made of a forged iron configures most of thefuel delivery pipe 20. Thecrude metal 30 is formed of a forged iron rod as a base metal. As illustrated inFIG. 6 , the rod is cut to a desired length so that acore metal 31 having a columnar shape is provided (a forging cutting step inFIG. 5 ). - Next, the
core metal 31 is phosphatized. Thephosphatized core metal 31 is then impregnated in epoxy resin electrodeposition paint and is cationically electrodeposited. By this cation electrodeposition coating, the outer periphery of thecore metal 31 is directly coated with the paint film 40 (an outer-periphery coating step inFIG. 5 ). Because the outer periphery of thecore metal 31 is a forged surface, the outer periphery is difficult to plate than a surface of a pressed sheet metal. Therefore, the cation electrodeposition coating is adopted in this embodiment. As a result of this, thepaint film 40 having a greater and uniform thickness, good adhesion properties, and little pinholes is formed. Furthermore, because thepaint film 40 is a resinous (nonmetal) film formed by the epoxy resin paint, no nickel-phosphorus plating layer 50 is formed on thepaint film 40 even if thepaint film 40 is not masked in a nickel-phosphorus plating step. The nickel-phosphorus plating step will be described later. - Next, the
core metal 31 is drilled through its axis so that an open-endedbore 32 is formed throughout the inside of thecore metal 31. By this drilling, thecrude metal 30 having the open-endedbore 32 is provided (a machining step inFIG. 5 ). Thecrude metal 30 has a wall that defines the open-endedbore 32. Because this wall is a machined surface 33 formed by drilling, the wall is easier to plate than a forged surface. Therefore, a plating film having a uniform thickness and little pinholes is provided in the nickel-phosphorus plating step. The nickel-phosphorus step will be described below. The thickness of thepaint film 40 is set at a thickness not to be pealed off even if thecore metal 31 is fixedly held with a clamp etc. in the drilling. Specifically, thepaint film 40 is approximately 10 to 20 μm thick. A measuring method by an electromagnetic thickness tester, a method of measuring masking step levels, etc. may be adopted to measure the film thickness. - Next, the
crude metal 30 is impregnated in nickel-phosphorus plating solution and then is electroless plated. By this plating, a nickel-phosphorus plating layer 50 is formed on the machined surface 33 (a nickel-phosphorus plating step inFIG. 5 ). Preferably, the nickel-phosphorus plating layer 50 should be 8 to 30 μm thick. More preferably, the nickel-phosphorus plating layer 50 should be 10 to 20 μm thick. A measuring method by an electromagnetic thickness tester, a method of measuring masking step levels, etc. may be adopted to measure the layer thickness. Because no nickel-phosphorus plating layer 50 is formed on thepaint film 40 as described above, the nickel-phosphorus plating layer 50 is formed only on the machined surface 33. By these steps, thefuel delivery pipe 20 is completed. Thecrude metal 30 has thefuel path 21A formed therein. The nickel-phosphorus plating layer 50 configures the inner periphery defining thefuel path 21A. - As illustrated in
FIG. 7 , thefuel delivery pipe 20 manufactured by the above-described steps has three layers composed of the nickel-phosphorus plating layer 50, thecrude metal 30, and thepaint film 40, in that order from thefuel path 21A. Thus, the nickel-phosphorus plating layer 50 is formed only on the portion that contacts the fuel passing through thefuel path 21A. Because of this, while nickel is one of rare metals, thefuel delivery pipe 20 needs a significantly less quantity of nickel. Furthermore, because thepaint film 40 functions as a mask, no masking step is needed. As a result, thefuel delivery pipe 20 can be manufactured at lower cost. - The present invention is not limited to the above-described embodiment with reference to the drawings. For example, following embodiments also are included within the technical scope of the present invention.
- (1) In the above-described embodiment, the method of manufacturing the
fuel delivery pipe 20 is illustrated as a method of manufacturing a fuel system part. According to the present invention, the present invention may be adopted in a method of manufacturing thefuel tank 12, the fuel transfer pipe P1, P2, the fuel return pipe P3, etc. - (2) In the above-described embodiment, the drilling is illustrated as the machining. According to the present invention, boring may be adopted in the machining.
- (3) In the above-described embodiment, the cation electrodeposition coating is adopted in coating the
crude metal 30 with thepaint film 40. According to the present invention, spray painting etc. may be adopted in forming a paint film. - (4) In the above-described embodiment, the shape of the
fuel delivery pipe 20 is specifically illustrated inFIGS. 2 through 4 . According to the present invention, the fuel delivery pipe may have, for example, four injector connecting portions.
Claims (4)
1. A method of manufacturing a fuel system part including a crude metal made of forged iron, a nickel-phosphorus plating layer formed on an inner surface of the crude metal, and a nonmetal paint film formed on an outer surface of the crude metal, the method comprising the steps of:
coating the outer surface of the crude metal with paint to form the paint film;
machining the crude metal with the paint film formed thereon to form a machined surface inside the crude metal; and
electroless plating the machined crude metal in nickel-phosphorus plating solution to form the nickel-phosphorus plating layer on the machined surface.
2. The method according to claim 1 ,
wherein:
the paint is an epoxy resin paint; and
the step of coating the outer surface includes coating the outer surface of the crude metal with the paint by cation electrodeposition coating.
3. A fuel system part with a fuel path formed therein so as to pass fuel therethrough, the fuel system part comprising:
a crude metal made of forged iron, the crude metal having a surface of the fuel path and an opposite surface from the fuel path;
a nickel-phosphorus plating layer formed on the surface of the fuel path of the crude metal; and
a nonmetal paint film formed on the opposite surface from the fuel path of the crude metal.
4. The fuel system part according to claim 3 , wherein the paint film is a cationically electrodeposited coating directly on an outer surface of the crude metal.
Priority Applications (1)
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US14/212,078 US9371587B2 (en) | 2010-11-12 | 2014-03-14 | Method of manufacturing fuel system part and fuel system part |
Applications Claiming Priority (2)
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JP2010254007A JP5469038B2 (en) | 2010-11-12 | 2010-11-12 | Manufacturing method of fuel system parts and fuel system parts |
JP2010-254007 | 2010-11-12 |
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US14/212,078 Division US9371587B2 (en) | 2010-11-12 | 2014-03-14 | Method of manufacturing fuel system part and fuel system part |
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US20120118746A1 true US20120118746A1 (en) | 2012-05-17 |
Family
ID=45044265
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US13/291,207 Abandoned US20120118746A1 (en) | 2010-11-12 | 2011-11-08 | Method of manufacturing fuel system part and fuel system part |
US14/212,078 Active 2032-10-27 US9371587B2 (en) | 2010-11-12 | 2014-03-14 | Method of manufacturing fuel system part and fuel system part |
Family Applications After (1)
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US14/212,078 Active 2032-10-27 US9371587B2 (en) | 2010-11-12 | 2014-03-14 | Method of manufacturing fuel system part and fuel system part |
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US (2) | US20120118746A1 (en) |
EP (1) | EP2453039B1 (en) |
JP (1) | JP5469038B2 (en) |
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US20200063702A1 (en) * | 2015-11-18 | 2020-02-27 | Sanoh Industrial Co., Ltd. | Fuel distribution pipe |
US10941743B2 (en) * | 2017-11-29 | 2021-03-09 | Denso Corporation | Fuel injection valve |
US20230287575A1 (en) * | 2021-06-03 | 2023-09-14 | General Electric Company | Surfaces for contacting a hydrocarbon fluid and methods for preparing the same |
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Also Published As
Publication number | Publication date |
---|---|
JP5469038B2 (en) | 2014-04-09 |
EP2453039B1 (en) | 2013-03-27 |
JP2012102386A (en) | 2012-05-31 |
US9371587B2 (en) | 2016-06-21 |
US20140199480A1 (en) | 2014-07-17 |
EP2453039A1 (en) | 2012-05-16 |
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