WO2013099513A1 - Procédé de revêtement d'un élément ressort - Google Patents

Procédé de revêtement d'un élément ressort Download PDF

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Publication number
WO2013099513A1
WO2013099513A1 PCT/JP2012/080906 JP2012080906W WO2013099513A1 WO 2013099513 A1 WO2013099513 A1 WO 2013099513A1 JP 2012080906 W JP2012080906 W JP 2012080906W WO 2013099513 A1 WO2013099513 A1 WO 2013099513A1
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WO
WIPO (PCT)
Prior art keywords
coating
spring member
painting
coating film
stabilizer
Prior art date
Application number
PCT/JP2012/080906
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English (en)
Japanese (ja)
Inventor
岡本　貴幸
靖彦 国田
Original Assignee
中央発條株式会社
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 中央発條株式会社 filed Critical 中央発條株式会社
Priority to CN201280058191.6A priority Critical patent/CN103958077A/zh
Publication of WO2013099513A1 publication Critical patent/WO2013099513A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B05D3/0281—After-treatment with induction heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means

Definitions

  • This invention relates to the coating method which can form the coating film excellent in adhesiveness and surface property on a spring member.
  • suspension springs are used in automobiles, railway vehicles, and the like.
  • the surface of the suspension spring is usually painted to give corrosion resistance.
  • the coating method include liquid coating using a liquid paint and powder coating using a powder paint.
  • the paint is heated after painting to cure the paint (baking painting).
  • Paint baking is usually performed using a hot air furnace or a far-infrared furnace.
  • heat is applied from the surface side of the paint.
  • the object to be coated spring member
  • baking requires a long time and is not efficient.
  • the object to be coated is thick, the baking time becomes long.
  • the state of the interface with the object to be coated in the coating film after baking greatly affects the adhesion of the coating film. In this regard, when heated in a furnace, the temperature rises faster toward the surface of the paint.
  • Patent Documents 2 and 3 disclose a method of energizing and heating a spring member for heat treatment of the spring member and preheating before painting.
  • the object to be energized and heated is an unpainted spring member.
  • the paint adheres to the surface of the spring member after painting. For this reason, it cannot touch easily and conveyance to an electricity supply apparatus etc. is difficult. Also, the paint has no conductivity. For this reason, even if it makes an electrode contact from the adhering coating material, sufficient electric current cannot be sent through a spring member. Therefore, the spring member after painting cannot be heated by energization only by diverting the conventional method.
  • the present invention has been made in view of such circumstances, and can efficiently bake the thermosetting paint adhered to the spring member and form a coating film excellent in adhesion and surface properties. It is an object to provide a method for painting a spring member.
  • a method for painting a spring member comprises applying a thermosetting paint to the surface of the spring member, and a coating portion having an uncured coating film on the spring member; Two non-coating parts that are arranged across the coating part and do not have an uncured coating, and an electrode connection step of electrically connecting electrodes to the two non-coating parts, A baking step of baking the coating film of the coating portion disposed between the two non-coating portions by applying a voltage between the electrodes and energizing and heating the spring member.
  • the surface of the spring member in addition to the base surface of the spring member, in the case where a coating of phosphate such as zinc phosphate or iron phosphate is formed on the base surface of the spring member, the surface of the coating is included.
  • two unpainted portions not having an uncured coating film are formed on the spring member after painting.
  • an electrode is electrically connected to two non-coating parts, respectively, and a voltage is applied between the said electrodes. Then, a current flows through the spring member between the electrodes (including the spring member of the coating portion), and the spring member is heated by the generated Joule heat. As a result, the uncured coating film (thermosetting paint) in the painted part is heated and cured.
  • the spring member coating method of the present invention the spring member is directly heated. For this reason, the thermosetting paint can be reliably heated to a predetermined temperature from the spring member side in a short time. Therefore, the thermosetting paint can be baked efficiently in a short time. Further, since the spring member is energized, unlike the induction heating, the spring member can be easily heated regardless of the shape of the spring member.
  • thermosetting paint is heated from the spring member side. For this reason, for example, when a powder coating is used as the thermosetting coating, the powder coating melts and spreads on the surface of the spring member, and easily penetrates into fine irregularities on the surface of the spring member. Thereby, a favorable coating film state can be obtained at the interface with the spring member. Moreover, there is little possibility that leveling will be impaired. Therefore, according to the method for coating a spring member of the present invention, a coating film excellent in adhesion and surface properties can be formed.
  • thermosetting paint In the painting process, two non-painted parts are formed on the spring member. No thermosetting paint is attached to the two non-painted parts. For this reason, gripping the two non-coating parts (including a mode of gripping via a cover member described later) facilitates the conveyance of the spring member after painting.
  • an electrode can be electrically connected to the two non-coating portions, and a current sufficient to heat the spring member can be passed.
  • a heating pattern including the heating temperature and heating time of the spring member Can be easily controlled. For example, when a liquid paint is used as the thermosetting paint, if the solvent is heated rapidly, the solvent evaporates too quickly and rough skin such as armpits is likely to occur. Therefore, control such as slowing the temperature rising rate may be performed.
  • the two non-coating portions may be formed by removing the thermosetting paint once applied.
  • the non-painted portion can be easily formed by painting the entire spring member and then removing the predetermined portion of the thermosetting paint.
  • the thermosetting paint can be easily removed with a brush or an air gun.
  • the two non-coating portions are coated with the thermosetting paint by shielding a region where the non-coating portions are formed with a cover member. It is good to be the structure formed by.
  • thermosetting paint in this configuration, a cover member is arranged in advance in an area where the non-painted portion is to be formed.
  • the area is shielded by the cover member, and thus the thermosetting paint does not adhere to the area.
  • the cover member may or may not be removed.
  • the next electrode connection step and baking step may be performed as they are without removing them. That is, you may connect an electrode to a non-coating part with the cover member arrange
  • the cover member may be removed after baking the uncured coating film.
  • the cover member has conductivity
  • the electrode connection step the non-painted portion is connected to the electrode through the cover member. It is also possible to adopt a configuration in which the cover member is removed after being connected and after the baking step.
  • the aspect which removes a cover member after coating is demonstrated in following (4).
  • the cover member may be removed after painting in the painting step.
  • the cover member is removed after painting.
  • This configuration is suitable when the cover member does not have conductivity, such as when the cover member is made of resin.
  • the baking step it may further include a partial coating step of coating the non-painted portion.
  • the non-painted portion may be separately painted according to this configuration.
  • the paint for painting the non-painted part may be the same as or different from the thermosetting paint used in the painting process.
  • a known heating method such as blast or induction heating may be used.
  • thermosetting paint may be a powder paint.
  • ⁇ Powder paint is less likely to scatter during painting compared to liquid paint containing water and solvent. Moreover, collection
  • the powder coating material those containing an epoxy resin are preferable from the viewpoint of improving the corrosion resistance. Furthermore, when weather resistance is considered, what contains both an epoxy resin and a polyester resin is suitable.
  • Stabilizer 10: Stabilizer body (spring member), 11, 12: Paint film, 20: Painted part, 21a, 21b: Non-painted part, 30: Air gun, 31: Corona charging paint gun, 32a, 32b: Cover member 4: current supply device, 40: power supply, 41a, 42a: first electrode, 41b, 42b: second electrode, 43a, 43b: wiring, 200, 201, 202, 203: uncured coating film.
  • the spring member is embodied as a stabilizer body.
  • FIG. 1 the perspective view of the stabilizer of this embodiment is shown.
  • the left-right direction is defined with reference to the case where the front side is viewed from the rear side.
  • FIG. 1 it shows through a stabilizer main body.
  • the stabilizer 1 includes a stabilizer body 10 and a coating film 11.
  • the stabilizer body 10 is made of a carbon steel pipe (STKM 13A, outer diameter ⁇ 23 mm, wall thickness 6 mm), and has a pipe shape that bulges forward in a C shape.
  • the stabilizer body 10 is included in the spring member of the present invention.
  • the coating film 11 covers the surface of the stabilizer body 10.
  • the coating film 11 is formed from an epoxy resin / polyester resin powder coating.
  • the epoxy resin / polyester resin powder coating is mainly composed of an epoxy resin, a polyester resin, and an extender pigment.
  • Stabilizer 1 is arranged near the front wheel of the vehicle. Both ends in the left-right direction of the stabilizer 1 are connected to a lower suspension arm (not shown). Two places on the left and right of the central portion of the stabilizer 1 are connected to a vehicle body (not shown) via a stabilizer bush (not shown).
  • the coating method of the stabilizer main body 10 of this embodiment has a coating process, an electrode connection process, a baking process, and a partial coating process.
  • FIG. 2 the front view of the stabilizer main body painted in the whole in the painting process is shown.
  • FIG. 3 the front view of the stabilizer main body in which the non-coating part was formed in the process is shown.
  • FIG. 4 the front view of the stabilizer main body in an electrode connection process and a baking process is shown.
  • FIG. 5 the front view of the stabilizer main body in a partial coating process is shown.
  • FIGS. 2 to 5 show the stabilizer body in a transparent manner.
  • the uncured coating film is shown with a right-up hatching and the cured coating film is shown with a right-down hatching.
  • an epoxy resin / polyester resin powder coating is applied to the surface of the stabilizer body 10 to form the coating portion 20 and the two non-painting portions 21a and 21b in the stabilizer body 10.
  • the stabilizer body 10 is supported by hanging two left and right portions of the center portion of the stabilizer body 10 on a hook member (not shown) hanging from above.
  • a zinc phosphate film is formed after a shot peening process is performed in advance.
  • an epoxy resin / polyester resin powder coating is applied to the entire surface of the stabilizer body 10 using a corona charging coating gun, and an uncured coating film 200 made of the powder coating is applied.
  • the uncured coating film 200 has a thickness of 60 to 100 ⁇ m.
  • the uncured coating film 200 formed on the left and right ends of the stabilizer body 10 is removed by blowing air with the air gun 30.
  • both ends of the stabilizer body 10 in the left-right direction are only the stabilizer body 10.
  • the coating part 20 which consists of the stabilizer main body 10 and the uncured coating film 200, and the two non-coating parts 21a and 21b which consist only of the stabilizer main body 10 are formed.
  • the two non-coating parts 21a and 21b are arranged with the coating part 20 in between.
  • the first electrodes 41a and 42a and the second electrodes 41b and 42b are electrically connected to the two formed non-painted portions 21a and 21b, respectively.
  • the energization device 4 includes a power source 40, first electrodes 41a and 42a, second electrodes 41b and 42b, and wirings 43a and 43b. By clamping the non-coating part 21a with the first electrodes 41a and 42a, the first electrodes 41a and 42a and the non-coating part 21a are electrically connected. The first electrodes 41a and 42a are connected to the power source 40 via the wiring 43a.
  • the second electrodes 41b and 42b and the non-coating part 21b are electrically connected by clamping the non-coating part 21b with the second electrodes 41b and 42b.
  • the second electrodes 41b and 42b are connected to the power source 40 via the wiring 43b.
  • a control unit (not shown) of the power supply 40 controls voltage on / off, voltage value to be applied, and the like.
  • a voltage is applied between the first electrodes 41a and 42a and the second electrodes 41b and 42b to heat the stabilizer body 10 with current, thereby baking the uncured coating film 200 of the coating portion 20. wear.
  • the power supply 40 is turned on, and a voltage is applied between the first electrodes 41a and 42a and the second electrodes 41b and 42b. Then, an electric current flows into the stabilizer main body 10 of the coating part 20 sandwiched between the two non-coating parts 21a and 21b, and Joule heat is generated. Thereby, the stabilizer main body 10 and the uncured coating film 200 are heated.
  • the uncured coating film 200 will be hardened by stopping electricity heating and standing to cool. That is, the coating film 11 shown in FIG. 1 is formed between the two non-coating portions 21a and 21b.
  • the temperature of the coating part 20 falls too much at the time of standing-to-cool and hardening of the coating film 200 does not fully advance, it heats again and raises the temperature of the coating part 20 to predetermined
  • the two non-painted parts 21a and 21b are painted.
  • the same powder coating material used in the painting process is applied to the two non-coating portions 21a and 21b (both ends in the left and right direction of the stabilizer body 10) using a corona charging coating gun 31.
  • An uncured coating film 201 (shown by a dotted line in FIG. 5) made of the powder coating material is formed.
  • the coating film 11 shown in FIG. 1 is formed by heating and curing the coating film 201 using an induction heating device.
  • the coating film 11 is formed on the whole surface of the stabilizer main body 10, and the stabilizer 1 of above-mentioned FIG. 1 is manufactured.
  • the effect of the coating method of the stabilizer main body 10 of this embodiment is demonstrated.
  • the stabilizer body 10 is directly heated by energization.
  • the uncured coating film 200 epoxy resin / polyester resin powder coating material
  • the stabilizer body 10 can be easily heated regardless of the shape of the stabilizer body 10.
  • the stabilizer body 10 is hollow. For this reason, the surface of the stabilizer main body 10 can be heated more efficiently.
  • the uncured coating film 200 is heated from the side of the stabilizer body 10. For this reason, the epoxy resin / polyester resin powder coating melts and spreads on the surface of the stabilizer body 10 and easily penetrates into fine irregularities on the surface of the stabilizer body 10. Thereby, a favorable coating film state can be obtained at the interface with the stabilizer body 10. Moreover, there is little possibility that leveling will be impaired. Therefore, the coating film 11 excellent in adhesion and surface properties can be formed.
  • the stabilizer body 10 is formed with two non-painted portions 21a and 21b. No epoxy resin / polyester resin powder coating is adhered to the two non-painted portions 21a and 21b. Therefore, the stabilizer main body 10 after coating can be easily transported by gripping the two non-coating portions 21a and 21b.
  • the first electrodes 41a and 42a and the second electrodes 41b and 42b are electrically connected to the two non-coating portions 21a and 21b, respectively, so that a current sufficient to heat the stabilizer body 10 is allowed to flow. it can. At this time, the temperature rise pattern including the heating temperature and the heating time of the stabilizer body 10 can be easily controlled by appropriately adjusting the voltage value to be applied and the energization time.
  • the entire stabilizer body 10 is painted, and then the uncured coating film 200 in the region where the two non-coating portions 21 a and 21 b are formed is removed using the air gun 30. Thereby, the two non-coating parts 21a and 21b can be formed easily.
  • the two non-painted portions 21a and 21b are painted. Thereby, the coating film 11 can be formed on the entire surface of the stabilizer body 10.
  • thermosetting paint Compared with liquid paints containing water and solvents, powder paints are less likely to scatter during painting. Moreover, collection
  • the coating method of the stabilizer body 10 of the present embodiment includes a coating process, an electrode connection process, and a baking process.
  • FIG. 6 the front view of the stabilizer main body with which the cover member was mounted
  • FIG. 7 shows a front view of a stabilizer body painted with a cover member in the same process.
  • FIG. 8 shows a front view of a stabilizer body in which a non-coating portion is formed in the same process.
  • FIG. 9 the front view of the stabilizer main body in an electrode connection process and a baking process is shown.
  • FIGS. 7 to 9 show the stabilizer body in a transparent manner.
  • the uncured coating film is shown with a right-up hatching.
  • the surface of the stabilizer body 10 is coated with an epoxy resin powder coating, and the stabilizer body 10 is formed with a painted portion 20 and two non-painted portions 21a and 21b.
  • the epoxy resin-based powder coating is mainly composed of an epoxy resin, a curing agent, and an extender pigment.
  • the cover member 32a is put on the left end portion of the stabilizer body 10, and the cover member 32b is put on the right end portion.
  • the cover members 32a and 32b are made of resin and have a cap shape.
  • an epoxy resin-based powder coating is adhered to the entire surface of the stabilizer body 10 using a corona charging coating gun to form an uncured coating film 202 made of the powder coating. .
  • the uncured coating film 202 has a thickness of 60 to 100 ⁇ m. Then, as shown in FIG. 8, the cover members 32a and 32b are removed. The area covered with the cover members 32a and 32b is composed only of the stabilizer body 10 without the uncured coating film 202 being formed. Thus, the coating part 20 which consists of the stabilizer main body 10 and the uncured coating film 202, and the two non-coating parts 21a and 21b which consist only of the stabilizer main body 10 are formed. The two non-coating parts 21a and 21b are arranged with the coating part 20 in between.
  • the first electrodes 41a and 42a and the second electrodes 41b and 42b are electrically connected to the two non-painted portions 21a and 21b, respectively.
  • a voltage is applied between the first electrodes 41a and 42a and the second electrodes 41b and 42b to heat the stabilizer body 10 by energization, whereby the uncured coating film 202 of the coating part 20 is applied. Is cured.
  • the electrode connecting step and the baking step are the same as in the first embodiment. Therefore, the description is omitted here.
  • the method of painting the stabilizer body 10 of the present embodiment has the same effects as the method of painting the stabilizer body 10 of the first embodiment with respect to the parts having the same configuration.
  • the cover members 32a and 32b are previously arrange
  • the epoxy resin powder coating in this state, two non-coating portions 21a and 21b having no uncured coating film 202 (epoxy resin powder coating) are easily formed in the stabilizer body 10. can do. That is, according to this embodiment, unlike the first embodiment, it is not necessary to remove the once-applied epoxy resin powder coating material.
  • the coating method of the stabilizer main body 10 of this embodiment after baking the coating film 202 of the coating part 20, coating of the two non-coating parts 21a and 21b is not performed. For this reason, the number of painting steps can be reduced.
  • ⁇ Third embodiment> The difference between the spring member coating method of the present embodiment and the spring member coating method of the second embodiment is that a partial coating step is provided after the baking step. Therefore, only the differences will be described here.
  • the coating method of the stabilizer body 10 of the present embodiment includes a coating process, an electrode connection process, a baking process, and a partial coating process.
  • the process from the painting process to the baking process is the same as in the second embodiment. Therefore, the description is omitted here.
  • FIG. 10 the front view of the stabilizer main body in a partial coating process is shown.
  • FIG. 10 shows the stabilizer main body in a transparent manner.
  • the coating film after hardening is shown by applying a right downward hatching.
  • a coating film 12 in which an uncured coating film 202 is cured is formed except for both ends in the left-right direction.
  • the two non-coating portions 21a and 21b that is, the regions of the stabilizer body 10 covered with the cover members 32a and 32b (see FIGS. 6 and 7) are painted.
  • the same powder coating material (epoxy resin powder coating material) used in the coating process is attached to the two non-coating portions 21a and 21b by using the corona charging coating gun 31 and is made of the powder coating material.
  • An uncured coating film 203 (indicated by a dotted line in FIG. 10) is formed.
  • the coating film 12 is formed by heating and curing the coating film 203 using an induction heating device. In this way, the coating film 12 is formed on the entire surface of the stabilizer body 10.
  • the coating method of the stabilizer body 10 of the present embodiment has the same effects as the coating method of the stabilizer body 10 of the second embodiment with respect to the parts having the same configuration. Moreover, according to the coating method of the stabilizer main body 10 of this embodiment, after baking the coating film 202 of the coating part 20, the two non-coating parts 21a and 21b are painted. Thereby, the coating film 12 can be formed on the entire surface of the stabilizer body 10.
  • the type of the spring member is not particularly limited.
  • various spring members such as a coil spring, a leaf spring, a torsion bar, and the like can be used as an object to be coated.
  • the material of the spring member is not particularly limited as long as it is a metal.
  • Spring steel generally used for springs is suitable. About a spring member, after carrying out hot forming or cold forming of spring steel etc., it is good to give shot peening etc. and to adjust surface roughness, for example.
  • a film of phosphate such as zinc phosphate or iron phosphate is formed on the surface of the spring member.
  • a coating film By forming a coating film on the phosphate film, the corrosion resistance and the adhesion of the coating film are improved.
  • the phosphate film covers 80% or more of the area of the painted surface of the spring member.
  • the corrosion resistance is further improved.
  • the formation of the phosphate film may be performed in accordance with an already known method. For example, a dipping method in which a spring member is immersed in a phosphate solution bath, a spray method in which a phosphate solution is sprayed onto the spring member with a spray gun or the like may be used.
  • the thermosetting paint may be a liquid paint or a powder paint.
  • the thermosetting paint has as a main component a base resin, a curing agent, and a pigment as a base for forming a coating film.
  • liquid paints include amino alkyd resin paints and epoxy resin paints (water-based and solvent-based).
  • the base resin for the powder coating material include epoxy resins and polyester resins. From the viewpoint of improving the corrosion resistance, those containing an epoxy resin are desirable. Furthermore, when weather resistance is considered, what contains both an epoxy resin and a polyester resin is suitable.
  • the polyester resin serves as the base resin
  • the epoxy resin serves as a curing agent, and curing proceeds by a reaction between the two.
  • the blending ratio of the epoxy resin and the polyester resin is not particularly limited, but for example, the equivalent ratio is preferably 1: 1.
  • polyester resins include polyhydric alcohols such as ethylene glycol, diethylene glycol, triethylene glycol, propanediol, butanediol, pentanediol, hexanediol, terephthalic acid, maleic acid, isophthalic acid, succinic acid, adipic acid, and sebatin.
  • resins obtained by transesterification or polycondensation reaction with a carboxylic acid such as an acid One kind of these resins may be used alone, or two or more kinds may be mixed and used.
  • curing agent examples include aromatic amines, acid anhydrides, dicyandiamide derivatives, organic acid dihydrazide derivatives, phenol resins, and the like.
  • the pigment examples include, for example, inorganic pigments such as carbon black, titanium dioxide, bengara, and ocher, and organic pigments such as quinacridone red, phthalocyanine blue, and benzidine yellow.
  • extender pigments include calcium carbonate, magnesium carbonate, talc, silica, and barium sulfate.
  • extender pigments are important because they affect the mechanical properties of the coating. For example, if the particle size of the particles constituting the extender pigment is small, the flexibility of the coating film is improved. Therefore, for example, when calcium carbonate is used as the extender pigment, the average particle diameter is preferably about 0.5 ⁇ m.
  • the impact resistance of the coating film also changes depending on the particle shape such as scale shape, indefinite shape, or needle shape. From the viewpoint of improving the impact resistance of the coating film, it is desirable to use an extender pigment having an acicular or irregular shape.
  • the content ratio of the pigment in the powder coating is not particularly limited.
  • the pigment content is 2% by mass or more when the total mass of the coating is 100% by mass.
  • the powder coating material may contain various additives as required in addition to the above.
  • the additive include a surface conditioner, an ultraviolet absorber, an antioxidant, a charge inhibitor, and a flame retardant.
  • thermosetting paint is a known method, that is, in the case of a liquid paint, a spraying method, an immersion method, an electrostatic coating method, etc., and in the case of a powder paint, an electrostatic coating method, an electrostatic fluidized immersion method. What is necessary is just to apply
  • the painting may be performed once or more than once. That is, after the thermosetting paint is attached to the surface of the spring member, the thermosetting paint may be repeatedly attached by being laminated on the paint.
  • the type of thermosetting paint used may be the same or different. For example, when the same kind of resin is contained in the laminated coating film, the adhesion between the coating films becomes high. For this reason, even if the big distortion peculiar to a spring member arises, coating films are hard to exfoliate. Further, the coating film easily follows the deformation of the spring member.
  • the two non-painted parts may be arranged so that the entire spring member of the painted part can be energized.
  • the two non-coating parts do not necessarily have to be arranged at both ends of the spring member as long as the coating part is sandwiched.
  • the non-coating part was formed by removing the applied thermosetting coating or painting using a cover member.
  • the unpainted part when there is a part that is not originally painted, such as an end face of the spring member, the unpainted part may be a non-painted part.
  • the shape and size of the electrode connected to the non-painted part are not particularly limited. However, the shape and size of the electrode need to be appropriately determined according to the shape and size of the non-painted portion so that the entire spring member of the painted portion can be energized.
  • a brush may be used in addition to an air gun.
  • the material, shape, etc. of a cover member will not be specifically limited if adhesion of a thermosetting coating material can be prevented.
  • the thermosetting paint can be baked by energizing the electrode as it is by connecting the electrode to the non-coating portion via the cover member.
  • the type of paint and the painting method are not particularly limited.
  • the paint may be the same as or different from the thermosetting paint used in the painting process.
  • the entire spring member can be applied integrally.
  • a known heating method such as blast or induction heating may be used.
  • the stabilizer main body (spring member) was energized and heated, and when the temperature of the coating part reached a predetermined temperature, the energized heating was stopped and the mixture was allowed to cool, thereby baking the uncured coating film.
  • the heating pattern including the heating temperature and heating time of the spring member is appropriately determined by adjusting the voltage value to be applied and the energization time according to the shape and size of the spring member, the type of thermosetting paint, etc. do it.
  • the coating method of this invention can be comprised including the rapid cooling process of rapidly cooling a coating film after a baking process.
  • the coating film may be rapidly cooled by blast, mist, shower, dipping, or the like.
  • the stabilizer coating was evaluated by coating the stabilizer body in the same manner as in the first embodiment except that the non-painted portion was not coated (partial coating step).
  • the stabilizer main body was energized and heated, held at a temperature shown in Table 1 below for a predetermined time, and then allowed to cool.
  • the gelation rate is a mass fraction of the extract insoluble matter in a solvent such as acetone or xylene. It can be evaluated how much curing has progressed by the gelation rate of the coating film.
  • a part of the coating film was scraped to obtain a sample, and the mass of the sample was measured.
  • the sample was immersed in acetone for 3 hours. And the sample after immersion was dried and the mass was measured. From the mass before and after the acetone immersion, the gelation rate was calculated by the following formula (I).
  • Gelation rate (%) dry mass of sample after solvent immersion / mass of sample before solvent immersion ⁇ 100 (I) As the curing proceeds, the gelation rate increases. For example, if the gelation rate is 90% or more, it can be determined that curing is sufficiently advanced.
  • Table 1 shows the evaluation results of the coating film.
  • Table 1 in the column for evaluation, those having a gelation rate of 90% or more and having a good surface condition are indicated by ⁇ , and the others are indicated by X.
  • the photograph of the coating film of the sample 4 is shown in FIG. In FIG. 12, the photograph of the coating film of the sample 6 is shown.
  • the gelation rate is 90% or more and the surface state is good even if the holding time is as short as 1 second. there were. That is, the curing was sufficiently advanced, and the coating film surface was smooth as shown in FIG.
  • the heating temperature was 160 ° C.
  • the sample 2 having a holding time of 1 second had a low gelation rate, and the curing did not proceed sufficiently.
  • the gelation rate was 90% or more and the surface condition was also good.
  • Sample 1 having a heating temperature of 150 ° C. had a low gelation rate even when the holding time was 10 seconds, and the curing did not proceed sufficiently. This is presumably because the temperature during baking was too low. Moreover, although the gelation rate was high about the sample 6 whose heating temperature is 220 degreeC, the surface state deteriorated. That is, since the temperature at the time of baking was too high, the coating film surface was roughened as shown in FIG.
  • thermosetting paint can be baked in a short time by energization heating, and a coating film having a smooth surface and a good appearance can be formed. It was done.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne un procédé de revêtement d'un élément ressort comprenant : une étape de revêtement dans laquelle une matière de revêtement thermodurcissable est appliquée sur la surface d'un élément ressort (10), permettant ainsi de former, dans l'élément ressort (10), une partie revêtue (20) qui a un film de revêtement non durci (200) et deux parties non revêtues (21a, 21b) qui sont disposées de façon à prendre en sandwich la partie revêtue (20) et qui n'ont pas le film de revêtement non durci (200); une étape de connexion d'électrodes dans laquelle des premières électrodes (41a, 42a) et des secondes électrodes (41b, 42b) sont connectées électriquement aux deux parties non revêtues (21a, 21b), respectivement; et une étape de cuisson dans laquelle le film de revêtement (200) sur la partie revêtue (20) qui est disposée entre les deux parties non revêtues (21a, 21b) est cuit par application d'une tension entre les premières électrodes (41a, 42a) et les secondes électrodes (41b, 42b), permettant ainsi de chauffer l'élément ressort (10) au moyen d'une conduction électrique.
PCT/JP2012/080906 2011-12-28 2012-11-29 Procédé de revêtement d'un élément ressort WO2013099513A1 (fr)

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JP2011288237A JP2013136022A (ja) 2011-12-28 2011-12-28 ばね部材の塗装方法

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WO2017069018A1 (fr) * 2015-10-23 2017-04-27 日本発條株式会社 Dispositif de pulvérisation de peinture pour barre stabilisatrice, et équipement ainsi que procédé de revêtement

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JPS52112645A (en) * 1976-03-19 1977-09-21 Daiichi Koshuha Kogyo Kk Method of lining steel tube* steel rod and the like using heat by electric current
JPS52122863A (en) * 1976-04-09 1977-10-15 Hitachi Ltd Insulation settling method for electromagnetic coil
JPS60171570U (ja) * 1984-04-25 1985-11-13 日立金属株式会社 粉体塗布装置
JPS63258681A (ja) * 1987-04-17 1988-10-26 Olympus Optical Co Ltd 形状記憶合金の表面処理方法
JP2012115801A (ja) * 2010-12-03 2012-06-21 Trinity Industrial Co Ltd 塗料固化方法及びコイル製造方法
JP2012119600A (ja) * 2010-12-03 2012-06-21 Trinity Industrial Co Ltd コイル製造方法
JP2012115802A (ja) * 2010-12-03 2012-06-21 Trinity Industrial Co Ltd 塗料固化方法及びコイル製造方法

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JPS52112645A (en) * 1976-03-19 1977-09-21 Daiichi Koshuha Kogyo Kk Method of lining steel tube* steel rod and the like using heat by electric current
JPS52122863A (en) * 1976-04-09 1977-10-15 Hitachi Ltd Insulation settling method for electromagnetic coil
JPS60171570U (ja) * 1984-04-25 1985-11-13 日立金属株式会社 粉体塗布装置
JPS63258681A (ja) * 1987-04-17 1988-10-26 Olympus Optical Co Ltd 形状記憶合金の表面処理方法
JP2012115801A (ja) * 2010-12-03 2012-06-21 Trinity Industrial Co Ltd 塗料固化方法及びコイル製造方法
JP2012119600A (ja) * 2010-12-03 2012-06-21 Trinity Industrial Co Ltd コイル製造方法
JP2012115802A (ja) * 2010-12-03 2012-06-21 Trinity Industrial Co Ltd 塗料固化方法及びコイル製造方法

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Publication number Priority date Publication date Assignee Title
WO2017069018A1 (fr) * 2015-10-23 2017-04-27 日本発條株式会社 Dispositif de pulvérisation de peinture pour barre stabilisatrice, et équipement ainsi que procédé de revêtement
JPWO2017069018A1 (ja) * 2015-10-23 2018-04-05 日本発條株式会社 スタビライザのための塗料吹付装置と塗装設備および塗装方法
EP3366378A4 (fr) * 2015-10-23 2019-05-15 NHK Spring Co., Ltd. Dispositif de pulvérisation de peinture pour barre stabilisatrice, et équipement ainsi que procédé de revêtement
US10792683B2 (en) 2015-10-23 2020-10-06 Nhk Spring Co., Ltd. Paint spraying apparatus for stabilizer, coating installation, and coating method

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CN103958077A (zh) 2014-07-30

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