WO2016133176A1 - 車両用ディスクブレーキのピストン及びその製造方法 - Google Patents
車両用ディスクブレーキのピストン及びその製造方法 Download PDFInfo
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- WO2016133176A1 WO2016133176A1 PCT/JP2016/054763 JP2016054763W WO2016133176A1 WO 2016133176 A1 WO2016133176 A1 WO 2016133176A1 JP 2016054763 W JP2016054763 W JP 2016054763W WO 2016133176 A1 WO2016133176 A1 WO 2016133176A1
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- piston
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- plating
- disc brake
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- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
- F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
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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
- C23C18/16—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
- C23C18/165—Multilayered product
- C23C18/1653—Two or more layers with at least one layer obtained by electroless plating and one layer obtained by electroplating
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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
- C23C18/16—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
- C23C18/1655—Process features
- C23C18/1662—Use of incorporated material in the solution or dispersion, e.g. particles, whiskers, wires
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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
- C23C18/16—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
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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
- C23C18/16—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
- C23C18/52—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 using reducing agents for coating with metallic material not provided for in a single one of groups C23C18/32 - C23C18/50
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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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/562—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of iron or nickel or cobalt
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- 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
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/42—Pretreatment of metallic surfaces to be electroplated of light metals
- C25D5/44—Aluminium
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- 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J1/00—Pistons; Trunk pistons; Plungers
- F16J1/01—Pistons; Trunk pistons; Plungers characterised by the use of particular materials
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- 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/26—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction characterised by the use of particular materials
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- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/02—Fluid pressure
- F16D2121/04—Fluid pressure acting on a piston-type actuator, e.g. for liquid pressure
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- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2125/00—Components of actuators
- F16D2125/02—Fluid-pressure mechanisms
- F16D2125/04—Cylinders
Definitions
- the present invention relates to a piston for a vehicle disc brake, and more particularly to an aluminum alloy piston accommodated in a cylinder hole formed in a caliper body via a piston seal, and a method for manufacturing the same.
- the piston of a vehicle disc brake has a surface treatment on the outer surface in order to maintain good sliding characteristics with the piston seal and improve the operational feeling.
- this surface treatment is known to form a chrome plating layer, but in recent years, it has both the characteristics of polytetrafluoroethylene (PTFE) and electroless nickel, and has good sliding properties between the piston and the piston seal.
- PTFE polytetrafluoroethylene
- a composite plating layer made of a nickel-phosphorus alloy containing PTFE and capable of maintaining dynamic characteristics is formed on the outer peripheral surface of a piston (for example, see Patent Document 1).
- an electroless nickel-phosphorus composite plating layer serving as a surface layer is formed on the outer surface of the piston via an electroless nickel-phosphorus plating layer serving as a base layer.
- the piston is formed of an aluminum alloy in order to reduce the weight of the vehicle body, when the piston is affected by braking heat, the base layer may be peeled off from the piston due to the difference in thermal expansion between the piston and the base layer. there were.
- an object of the present invention is to provide an aluminum alloy vehicle disc brake piston having excellent strength and capable of improving operational feeling and a method for manufacturing the same.
- the piston of the vehicle disc brake according to the present invention is: A piston accommodated in a cylinder hole formed in a caliper body of a disc brake for a vehicle so as to be movable in a disc axial direction via a piston seal,
- the piston has a piston body made of an aluminum alloy, and a coating layer formed on the outer surface of the piston body,
- the coating layer includes a first plating layer made of an iron-phosphorus alloy and a second plating layer made of a nickel-phosphorus alloy formed on the first plating layer.
- the present invention can further take the following aspects.
- the second plating layer further includes 10 to 30% by volume of resin particles, and polytetrafluoroethylene (PTFE) can be used as the material of the resin particles.
- PTFE polytetrafluoroethylene
- the first plating layer may have a thickness of 1 to 15 ⁇ m
- the second plating layer may have a thickness of 1 to 15 ⁇ m.
- a method of manufacturing a piston of a vehicle disc brake according to the present invention A method of manufacturing a piston accommodated in a cylinder hole formed in a caliper body of a disc brake for a vehicle so as to be movable in a disc axial direction via a piston seal, Forming a first plating layer made of an iron-phosphorus alloy on the outer surface of the piston body made of an aluminum alloy by electrolytic plating after the zincate treatment; Forming a second plating layer made of a nickel-phosphorus alloy by electroless plating on the surface of the first plating layer.
- the production method of the present invention can further take the following aspects.
- a plating solution containing an iron compound, a phosphinic acid compound and an organic acid can be used.
- the organic acid may be glycine and L-ascorbic acid.
- the second plating layer may further include 10 to 30% by volume of resin particles, and the material of the resin particles may be polytetrafluoroethylene (PTFE).
- PTFE polytetrafluoroethylene
- the piston of the vehicular disc brake according to the present invention has high strength because of the good adhesion of the coating layer to the piston body, and further has excellent operational feeling.
- the manufacturing method of the piston of the disk brake for vehicles which concerns on this invention can form the 1st plating layer with high adhesiveness with a piston main body, and also 2nd plating with high adhesiveness with a 1st plating layer. Since the layer can be formed, a coating layer having excellent adhesion to the piston body can be formed, and the operation feeling can be enhanced by the second plating layer.
- FIG. 1 is a cross-sectional view of a vehicle disc brake showing an embodiment of the present invention.
- FIG. 2 is an explanatory view showing, in an enlarged manner, a main part of the vehicle disc brake.
- FIG. 3A is a diagram illustrating measurement results of the example.
- FIG. 3B is a diagram illustrating a measurement result of the comparative example.
- the disc brake 1 includes a caliper body 3 via a pair of slide pins (both not shown) on a caliper bracket fixed to the vehicle body on one side of the disc rotor 2. Is supported so as to be movable in the disk axial direction.
- the caliper body 3 includes an action part 3a and a reaction part 3b that are arranged opposite to each side of the disk rotor 2, and a bridge part 3c that connects these parts across the outer periphery of the disk rotor 2, and reacts with the action part 3a.
- a pair of friction pads 4, 4 are suspended between the part 3 b so as to be movable in the disk axis direction using the hanger pins 5.
- the acting part 3 a is provided with a cylinder hole 6 opened to the disk rotor 2 side, and the reaction part 3 b is formed with bifurcated reaction force claws 3 d sandwiching both sides of the cylinder hole 6.
- a cup-shaped piston 7 is inserted into the cylinder hole 6 via a piston seal 8 and a dust seal 9, and a hydraulic chamber 10 is defined between the piston 7 and the bottom of the cylinder hole 6.
- the piston seal 8 and the dust seal 9 are annular elastic bodies made of synthetic rubber or soft synthetic resin, and each inner peripheral surface is formed with a smaller diameter than the outer peripheral surface of the piston 7.
- the outer peripheral surface of the piston 7 and the inner peripheral surfaces of the piston seal 8 and the dust seal 9 are in close contact with each other, and the fluid pressure chamber 10 side is sealed fluid-tightly from the piston seal 8, and between the cylinder hole 6 and the piston 7 by the dust seal 9. Prevents dust and rainwater from entering the door.
- the piston 7 has a piston main body 71 made of an aluminum alloy and a coating layer 20 formed on the outer surface of the piston main body 71.
- the coating layer 20 includes a first plating layer 21 made of an iron-phosphorus alloy formed on the surface 7a of the piston body 71, and a second plating layer 22 made of a nickel-phosphorus alloy formed on the first plating layer 21. And have.
- the film thickness of the first plating layer 21 is preferably 1 to 15 ⁇ m, more preferably 5 to 15 ⁇ m. When the film thickness of the first plating layer 21 is within this range, high adhesion to the piston main body 71 can be obtained, and a predetermined hardness can be maintained even when the piston 7 is heated by braking heat. it can.
- the film thickness of the second plating layer 22 is preferably 1 to 15 ⁇ m, more preferably 5 to 7 ⁇ m. When the film thickness of the second plating layer 22 is in this range, it can sufficiently withstand the temperature rise of the piston 7 due to braking heat.
- the second plating layer 22 sets the eutectoid amount of resin particles such as PTFE particles in a range of preferably 10 to 30% by volume, more preferably 15 to 25% by volume, and has a surface roughness of 1%. It is desirable to set in the range of ⁇ 8S.
- surface roughness is defined by JIS B0601 (measurement method: maximum height roughness).
- the piston 7 Due to the second plating layer 22 made of a nickel-phosphorus alloy containing such resin particles, the piston 7 has high non-adhesiveness and sliding properties with respect to the piston seal 8 and can have excellent operation feeling.
- the function of the second plating layer 22 is described in detail in JP-A-11-63047 (Japanese Patent Application No. 9-214352).
- the coating layer 20 is formed by the following process.
- a pretreatment such as a degreasing treatment and a zincate treatment is performed by a known method.
- a pretreatment such as a degreasing treatment and a zincate treatment is performed by a known method.
- the oxide film on the surface of the piston main body 71 is removed and zinc is substituted and deposited.
- the surface of the aluminum alloy is etched using an alkaline solution containing sodium hydroxide to remove the oxide film.
- a zincate treatment is performed using a zincate solution containing zinc oxide (for example, trade name “Albond” manufactured by World Metal).
- the zincate treatment can be performed a plurality of times as necessary.
- a first plating layer 21 made of an iron-phosphorus alloy is formed by electrolytic plating.
- electrolytic plating can be performed under the following conditions.
- a plating solution in which at least an iron compound, a phosphinic acid compound, and an organic acid are dissolved in a solvent such as water can be used.
- the iron compound iron chloride, iron sulfate and the like can be used.
- the phosphinic acid compound is a compound that serves as a source of phosphite ions in the plating solution.
- hypophosphite, phosphorous acid, phosphite, and the like can be used, preferably hypophosphorous acid.
- a salt can be used.
- hypophosphite sodium hypophosphite, potassium hypophosphite and the like can be used, and as the phosphite, sodium phosphite and the like can be used.
- organic acid glycine, L-ascorbic acid and the like can be used.
- saccharin sodium, urea and the like can be used as components of the plating solution.
- the following composition can be used.
- Plating solution composition Ferrous chloride hydrate 15-400 g / l Sodium hypophosphite hydrate 1-60 g / l Glycine 2-20 g / l L-ascorbic acid 5 to 90 g / l Water rest
- plating conditions for example, the following conditions can be used. Plating conditions; Temperature 10-60 °C Time 5-60 minutes pH 1-4 Current density 1 to 1.5 A / dm 2
- the second plating layer 22 made of a nickel-phosphorus alloy is formed by electroless plating using an electroless plating solution.
- an electroless plating solution a solution containing resin particles such as polytetrafluoroethylene (PTFE) is preferably used.
- the second plating layer preferably contains 10 to 30% by volume of resin particles.
- an electroless plating solution for example, a commercially available product “Nimflon T” (manufactured by Uemura Kogyo Co., Ltd.) can be used.
- the commercial product “Nimflon T” contains 85-87 wt% nickel, 8-10 wt% phosphorus and 21 ⁇ 3 vol% PTFE.
- the first plating layer 21 and the second plating layer 22 are not limited to the above methods, and may be formed by plating using a known plating solution if a predetermined iron-phosphorus alloy and nickel-phosphorus alloy plating layer is obtained. Can do.
- the first plating layer 21 made of iron-phosphorus alloy is formed by electrolytic plating, and then the second plating made of nickel-phosphorus alloy.
- the plating layer 22 By forming the plating layer 22 by electroless plating, the piston main body 71, the first plating layer 21 and the second plating layer 22 have high adhesion to each other, and form the coating layer 20 having excellent peeling resistance. be able to.
- the piston 7 according to the present embodiment has high strength because the adhesion of the coating layer 20 to the piston main body 71 is good, and further has excellent operation feeling.
- a piston main body (outer diameter ⁇ 30 mm, inner diameter ⁇ 26 mm, shaft length 22 mm; aluminum alloy is alloy number A6061 based on JIS H4000) formed of an aluminum alloy having the same shape as the piston main body 71 of FIG.
- a zincate treatment was performed using a zincate solution “Albond 250” (manufactured by World Metal).
- electrolytic plating was performed using the following plating solution and plating conditions to form a first plating layer 21 made of an iron-phosphorus alloy on the surface of the aluminum alloy plate.
- the film thickness of the first plating layer 21 was 12 ⁇ m.
- electroless plating was performed using a commercially available electroless plating solution (trade name “Nimflon T” manufactured by Uemura Kogyo Co., Ltd.) to form a second plating layer 22 made of a nickel-phosphorus alloy.
- the film thickness of this second plating layer was 5 ⁇ m.
- the eutectoid amount of PTFE particles was 21% by volume.
- the second plating layer 22 had a surface roughness R of 2 ⁇ m according to JIS B0601.
- the temperature of the plating solution and the plating time were appropriately set under the conditions of a temperature of 80 to 95 ° C. and a time of 40 to 50 minutes so that the above film thickness was obtained.
- Electroless plating was performed using a commercially available electroless plating solution (trade name “Nimden KTY” manufactured by Uemura Kogyo Co., Ltd.) to form a first plating layer made of a nickel-phosphorous alloy and having a thickness of 12 ⁇ m.
- “Nimden KTY” contains 89 to 91% by weight of nickel and 9 to 11% by weight of phosphorus.
- electroless plating was performed using a commercially available electroless plating solution (trade name “Nimflon T” manufactured by Uemura Kogyo Co., Ltd.) to form a second plating layer made of a nickel-phosphorus alloy.
- the second plating layer was almost the same as the second plating layer of the example, the film thickness was 5 ⁇ m, the eutectoid amount of PTFE particles was 21 vol%, and the surface roughness R according to JIS B0601 was 2 ⁇ m.
- the temperature of the plating solution and the plating time were appropriately set under conditions of a temperature of 80 to 95 ° C. and a time of 40 to 50 minutes so as to be almost equal to the film thickness of the plating layer in the examples.
- the adhesion test was conducted in accordance with the method of thermal shock test of JIS H8504.
- the adhesion of the plating is observed by a thermal shock that heats and quenches the sample.
- the inside of the heating furnace is heated to 300 ° C., and the sample is placed in the furnace.
- the sample is taken out of the furnace and placed in room-temperature water and rapidly cooled.
- the surface of the sample thus obtained was visually observed.
- the resulting images are shown in FIGS. 3A and 3B.
- FIG. 3A is an image of the sample of the example
- FIG. 3B is an image of the sample of the comparative example.
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- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Combustion & Propulsion (AREA)
- Dispersion Chemistry (AREA)
- Chemically Coating (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Braking Arrangements (AREA)
- Electroplating And Plating Baths Therefor (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
車両用ディスクブレーキのキャリパボディに形成されたシリンダ孔に、ピストンシールを介してディスク軸方向に移動可能に収容されるピストンであって、
前記ピストンは、アルミニウム合金からなるピストン本体と、該ピストン本体の外表面に形成された被覆層とを有し、
前記被覆層は、鉄―リン合金からなる第1めっき層と、該第1めっき層の上に形成されたニッケルーリン合金からなる第2めっき層とを有する。
車両用ディスクブレーキのキャリパボディに形成されたシリンダ孔に、ピストンシールを介してディスク軸方向に移動可能に収容されるピストンの製造方法であって、
アルミニウム合金からなるピストン本体の外表面に、ジンケート処理後に電解めっきにて鉄-リン合金からなる第1めっき層を形成する工程と、
前記第1めっき層の表面に、無電解めっきにてニッケルーリン合金からなる第2めっき層を形成する工程と、を含む。
まず、周知の方法によって脱脂処理及びジンケート処理などの前処理を行う。この前処理によって、ピストン本体71の表面の酸化皮膜を除去するとともに、亜鉛を置換析出させる。例えば、前処理は、水酸化ナトリウムを含むアルカリ溶液を用いてアルミニウム合金の表面をエッチングし、酸化皮膜を除去する。その後、酸化亜鉛を含むジンケート液(例えば商品名「アルボンド」ワールドメタル社製)を用いてジンケート処理を行う。ジンケート処理は、必要に応じて複数回にわたって行うことができる。
次いで、鉄-リン合金からなる第1めっき層21を電解めっきによって形成する。かかる電解めっきは、以下の条件で行うことができる。第1めっき層を形成する工程においては、少なくとも鉄化合物、ホスフィン酸化合物及び有機酸を水などの溶媒に溶解しためっき液を用いることができる。鉄化合物としては、塩化鉄、硫酸鉄などを用いることができる。ホスフィン酸化合物は、めっき液にてホスフィン酸イオンの供給源となる化合物であり、例えば、次亜リン酸塩、亜リン酸及び亜リン酸塩などを用いることができ、好ましくは次亜リン酸塩を用いることができる。次亜リン酸塩としては、次亜リン酸ナトリウム、次亜リン酸カリウムなどを用いることができ、亜リン酸塩としては、亜リン酸ナトリウムなどを用いることができる。有機酸としては、グリシン、L-アスコルビン酸などを用いることができる。めっき液の成分として、その他にもサッカリンナトリウム、尿素などを用いることができる。
塩化第1鉄・水和物 15~400g/l
次亜リン酸ナトリウム・水和物 1~60 g/l
グリシン 2~20 g/l
L-アスコルビン酸 5~90 g/l
水 残り
めっき条件;
温度 10~60℃
時間 5~60分
pH 1~4
電流密度 1~1.5A/dm2
ニッケルーリン合金からなる第2めっき層22は、無電解めっき液を用いて無電解めっきによって形成される。かかる無電解めっき液としては、好ましくは、ポリテトラフルオロエチレン(PTFE)などの樹脂粒子を含むものが用いられる。第2めっき層は、好ましくは樹脂粒子を10~30体積%含む。このような無電解めっき液としては、例えば、市販品「ニムフロンT」(上村工業株式会社製)を用いることができる。市販品「ニムフロンT」は、85~87重量%のニッケル、8~10重量%のリン及び21±3体積%のPTFEを含んでいる。
温度 80~95℃
時間 40~50分
(1)実施例のサンプル
本実施例のサンプルは、以下の方法で作成した。
FeCl2・4H2O 298g/l
次亜リン酸ナトリウム・水和物 10g/l
グリシン 11g/l
L-アスコルビン酸 35g/l
水 残り
めっき条件;
温度 30℃
時間 45分
pH 3
電流密度 1.0A/dm2
比較例のサンプルは、以下の方法で作成した。
実施例及び比較例のサンプルにつき、それぞれ、めっき密着性の試験を行った。
Claims (7)
- 車両用ディスクブレーキのキャリパボディに形成されたシリンダ孔に、ピストンシールを介してディスク軸方向に移動可能に収容されるピストンであって、
前記ピストンは、アルミニウム合金からなるピストン本体と、該ピストン本体の外表面に形成された被覆層とを有し、
前記被覆層は、鉄―リン合金からなる第1めっき層と、該第1めっき層の上に形成されたニッケルーリン合金からなる第2めっき層とを有する、車両用ディスクブレーキのピストン。 - 請求項1において、
前記第2めっき層は、さらに樹脂粒子を10~30体積%含み、前記樹脂粒子の材質はポリテトラフルオロエチレン(PTFE)である、車両用ディスクブレーキのピストン。 - 請求項1または請求項2において、
前記第1めっき層は、膜厚が1~15μmであり、
前記第2めっき層は、膜厚が1~15μmである、車両用ディスクブレーキのピストン。 - 車両用ディスクブレーキのキャリパボディに形成されたシリンダ孔に、ピストンシールを介してディスク軸方向に移動可能に収容されるピストンの製造方法であって、
アルミニウム合金からなるピストン本体の外表面に、ジンケート処理後に電解めっきにて鉄-リン合金からなる第1めっき層を形成する工程と、
前記第1めっき層の表面に、無電解めっきにてニッケルーリン合金からなる第2めっき層を形成する工程と、
を含む、車両用ディスクブレーキのピストンの製造方法。 - 請求項4において、
前記第1めっき層を形成する工程において、鉄化合物、ホスフィン酸化合物及び有機酸を含むめっき液を用いる、車両用ディスクブレーキのピストンの製造方法。 - 請求項5において、
前記有機酸は、グリシン及びL-アスコルビン酸である、車両用ディスクブレーキのピストンの製造方法。 - 請求項4ないし請求項6のいずれかにおいて、
前記第2めっき層は、さらに樹脂粒子を10~30体積%含み、前記樹脂粒子の材質はポリテトラフルオロエチレン(PTFE)である、車両用ディスクブレーキのピストンの製造方法。
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ES16752562T ES2908549T3 (es) | 2015-02-19 | 2016-02-18 | Pistón para freno de disco vehicular y método de fabricación del mismo |
EP16752562.5A EP3267065B1 (en) | 2015-02-19 | 2016-02-18 | Piston for vehicular disc brake and manufacturing method thereof |
US15/547,445 US10465759B2 (en) | 2015-02-19 | 2016-02-18 | Piston for vehicle disc brake and manufacturing method thereof |
JP2017500740A JP6738794B2 (ja) | 2015-02-19 | 2016-02-18 | 車両用ディスクブレーキのピストン及びその製造方法 |
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EP (1) | EP3267065B1 (ja) |
JP (1) | JP6738794B2 (ja) |
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2016
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- 2016-02-18 EP EP16752562.5A patent/EP3267065B1/en active Active
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JP2704792B2 (ja) * | 1990-03-22 | 1998-01-26 | 日信工業株式会社 | シリンダ装置 |
JPH0445280A (ja) * | 1990-06-13 | 1992-02-14 | Fuji Kiko Denshi Kk | セラミックスの無電解めっきにおける前処理用組成物とセラミックスのめっき方法 |
JP2006292119A (ja) * | 2005-04-13 | 2006-10-26 | Hitachi Ltd | ディスクブレーキおよびディスクブレーキ用ピストン |
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US20180003252A1 (en) | 2018-01-04 |
ES2908549T3 (es) | 2022-05-03 |
US10465759B2 (en) | 2019-11-05 |
EP3267065A1 (en) | 2018-01-10 |
JP6738794B2 (ja) | 2020-08-12 |
EP3267065B1 (en) | 2021-12-08 |
EP3267065A4 (en) | 2018-10-10 |
JPWO2016133176A1 (ja) | 2017-11-30 |
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