US20100181188A1 - Anodizing apparatus - Google Patents
Anodizing apparatus Download PDFInfo
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- US20100181188A1 US20100181188A1 US12/648,614 US64861409A US2010181188A1 US 20100181188 A1 US20100181188 A1 US 20100181188A1 US 64861409 A US64861409 A US 64861409A US 2010181188 A1 US2010181188 A1 US 2010181188A1
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- electrode member
- circumferential surface
- fluid
- passage
- thrusting
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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
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
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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
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/005—Apparatus specially adapted for electrolytic conversion coating
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/004—Sealing devices
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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
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/10—Electrodes, e.g. composition, counter electrode
- C25D17/12—Shape or form
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
An anodizing apparatus includes a first electrode member electrically connected to a processing subject formed with a circumferential groove at an outer circumferential surface thereof, a second electrode member including an inner circumferential surface, facing each of the outer circumferential surface and the circumferential groove of so as to include an interval, elastic seal members for sealing a clearance generated between the outer circumferential surface of and the inner circumferential surface, and a thrusting mechanism thrusting the elastic seal members to the second electrode member, and thereby elastically deforming the elastic seal members so as to seal the clearance. The thrusting mechanism is switchable between a thrusting state and a released state. A fluid supplying passage, through which an electrolytic solution is supplied to the circumferential groove, and a fluid discharging passage, through which the electrolytic solution is discharged, are formed so as to open at the inner circumferential surface.
Description
- This application is based on and claims priority under 35 U.S.C. §119 to Japanese Patent Application 2009-008720, filed on Jan. 19, 2009, the entire content of which is incorporated herein by reference.
- This disclosure relates to an anodizing apparatus.
- According to the anodizing apparatus, disclosed in JP2003-113496A, an acid electrolytic solution including sulfuric acid, chromic acid and the like, is used. Further, the first electrode member is electrically connected to the processing subject so that the processing subject serves as an anode. The processing subject and the second electrode member are energized through the electrolytic solution. Consequently, a surface of the processing subject, which is made of, for example, an aluminum-based metal, is oxidized, and thereby an alumite coating is formed. According to the anodizing apparatus, disclosed in JP2003-113496A, a stick-shaped second electrode member is immersed in the electrolytic solution.
- According to the known anodizing apparatus, however, since the stick-shaped second electrode member is immersed in the electrolytic solution, an electric current may concentrate at a portion of the circumferential groove of the processing subject in the vicinity of the second electrode member. Therefore, it may be difficult to uniform density of an electric current along the circumferential groove of the processing subject. Accordingly, forming a coating whose thickness is even along a longitudinal direction of the circumferential groove of the processing subject, may be difficult.
- A need thus exists for an anodizing apparatus that is not susceptible to the drawback mentioned above.
- According to an aspect of this disclosure, an anodizing apparatus includes a first electrode member electrically connected to a processing subject, made of metal and formed with a circumferential groove at an outer circumferential surface thereof, a second electrode member including an inner circumferential surface, formed into an annular shape and facing each of the outer circumferential surface of the processing subject and the circumferential groove of the processing subject so as to include an interval between the second electrode member and each of the outer circumferential surface of the processing subject and the circumferential groove of the processing subject, elastic seal members being nonconductive, respectively formed into an annular shape, and respectively provided at both sides of the circumferential groove in a width direction thereof for sealing a clearance generated between the outer circumferential surface of the processing subject and the inner circumferential surface of the second electrode member, and a thrusting mechanism thrusting each of the elastic seal members relative to the second electrode member in the width direction of the circumferential groove of the processing subject, and thereby elastically deforming each of the elastic seal members so as to seal the clearance. The thrusting mechanism is switchable between a thrusting state for thrusting the elastic seal members and a released state for releasing the thrusting of the elastic seal members. A fluid supplying passage, through which an electrolytic solution is supplied to the circumferential groove of the processing subject, and a fluid discharging passage, through which the electrolytic solution, supplied to the circumferential groove of the processing subject, is discharged, are formed so as to open at the inner circumferential surface of the second electrode member.
- The foregoing and additional features and characteristics of this disclosure will become more apparent from the following detailed description considered with the reference to the accompanying drawings, wherein:
-
FIG. 1 is a schematic view illustrating an anodizing apparatus; -
FIG. 2A is a side view illustrating a main portion of the anodizing apparatus; -
FIG. 2B is an enlarged side view illustrating the main portion of the anodizing apparatus; -
FIG. 3A is a side view illustrating the main portion of the anodizing apparatus; -
FIG. 3B is an enlarged side view illustrating the main portion of the anodizing apparatus; and -
FIG. 4 is a planar view illustrating the main portion of the anodizing apparatus. - An embodiment of an anodizing apparatus will be explained hereinafter with reference to the attached drawings. Directions, such as upper, lower, vertical, horizontal and the like mentioned hereinafter correspond to an orientation of the anodizing apparatus.
FIG. 1 illustrates the anodizing apparatus for anodizing a first piston ring groove A1 of a metal-made processing subject, such as of a piston A, made of an aluminum alloy, for example. - More specifically, the first piston ring groove A1, a second piston ring groove A2 and a third piston ring groove A3 are formed at the piston A so as to be aligned from an lower end portion of the piston A toward a skirt portion thereof. The anodizing apparatus according to the embodiment anodizes an outer circumferential surface of the piston A, including the first piston ring (a compression ring) groove A1, which is provided closest to the lower end portion of the piston A among the first, second and third piston ring grooves A1, A2 and A3. The first piston ring groove A1, formed at a first outer
circumferential surface 22 of the piston (a processing subject) A, serves as a circumferential groove. - The anodizing apparatus includes an
electrolytic solution tank 1, an electrolyticsolution supplying portion 2, an oxidizingportion 3 and anenergizing portion 4. - The
electrolytic solution container 1, made of vinyl chloride or SUS 316, is formed into a container shape whose upper end is open. Theelectrolytic solution container 1 includes arecycle passage 5 for receiving and collecting an electrolytic solution, which has flown through the oxidizingportion 3 and for recycling the electrolytic solution to the electrolyticsolution supplying portion 2. - The electrolytic
solution supplying portion 2 includes acooling container 6, a supplyingpassage 7, a supplyingpump 8 and a supplyingcontrol portion 9. Thecooling container 6 is provided for cooling the electrolytic solution, which is recycled from theelectrolytic solution container 1. The supplyingpassage 7 is used for supplying the electrolytic solution from thecooling container 6 to the oxidizingportion 3. The supplyingpump 8 is provided at the supplyingpassage 7. The supplyingcontrol portion 9 controls an operation of the supplyingpump 8 so that the electrolytic solution is supplied to the oxidizingportion 3 at a predetermined timing. - The
cooling container 6 includes acooling device 10, atemperature sensor 11 and acooling control portion 12. Thecooling device 10 cools the electrolytic solution, which is collected from the oxidizingportion 3. Thecooling control portion 12 controls an operation of thecooling device 10 based on information of a temperature of the electrolytic solution, detected by means of thetemperature sensor 11, so that the electrolytic solution is cooled to a predetermined temperature. - The energizing
portion 4 energizes the oxidizingportion 3. The energizingportion 4 may include an electric current control means for adjusting electric current density. A known electric current control means, including an ammeter, a voltmeter, a commutator and the like, may be used. - As illustrated in
FIGS. 2 and 3 , the oxidizingportion 3 includes a first electrode (anode)portion 13 and a second electrode (cathode)portion 14. Thefirst electrode portion 13 includes afirst electrode member 15 and a lifting and loweringdevice 16. Thefirst electrode member 15 is made of metal, such as copper, SUS 316 or the like, which are electrically conductive. The lifting and loweringdevice 16 lifts and lowers thefirst electrode member 15 relative to thesecond electrode portion 14. Further, thefirst electrode member 15 also serves as a holding means for holding the piston A. Thefirst electrode member 15 is electrically connected to ananode terminal 4 a of the energizingportion 4. - The first electrode member (the holding means) 15 includes an engagement portion, which is engageable with/disengageable from an inner circumferential surface of the piston A, at a lower end portion thereof. The
first electrode member 15 engages with the piston A by means of the engagement portion, thereby holding the piston A so that an axis of the piston A extends along a vertical direction in a state where thefirst electrode member 15 and the piston A are electrically connected. - The
second electrode portion 14 includes asecond electrode member 17, amovable plate 18 and afixed plate 19. Thesecond electrode member 17 is made of metal, such as copper, SUS 316, or the like, which are electrically conductive. Themovable plate 18 and thefixed plate 19, each of which is made of nonconductive material (insulator), such as vinyl chloride resin or the like, are arranged at upper and lower portions of thesecond electrode member 17, respectively. - As illustrated in
FIGS. 3 and 4 , thesecond electrode member 17 is formed with apiston insertion hole 20 for inserting the piston A therein, in a state where the axis of the piston A extends in an upper-lower direction. Consequently, thesecond electrode member 17 is formed into a substantially annular shape having a rectangular-shaped cross section. Thesecond electrode member 17 is electrically connected to acathode 4 b of theenergizing portion 4. - An inner
circumferential surface 21, which forms thepiston insertion hole 20, faces the first outercircumferential surface 22 of the piston A and the first piston ring groove A1 for an entire circumference so as to include a predetermined interval therebetween, and thereby the innercircumferential surface 21 is formed into a substantially annular shape. - As illustrated in
FIG. 4 , each of a plurality offluid supplying passages 23 and each of a plurality offluid discharging passages 24 are alternately formed so as to open at the innercircumferential surface 21, which forms thepiston insertion hole 20, so as to include an interval between the adjacent passages. The plurality offluid supplying passages 23 is used for supplying the electrolytic solution to the first piston ring groove A1. The plurality offluid discharging passages 24 is used for discharging the electrolytic solution, which is supplied to the first piston ring groove A1. Each of the plurality of thefluid supplying passages 23 and each of the plurality of thefluid discharging passages 24 is arranged so as to extend radially from a center of thesecond electrode member 17 toward a second outercircumferential surface 26 of thesecond electrode member 17. - The number of the
fluid supplying passages 23, formed at thesecond electrode member 17, and the number of thefluid discharging passages 24, formed at thesecond electrode member 17, are the same. Further, each of thefluid supplying passages 23 is formed into a substantially circular shape when seen in a cross-sectional view while each of thefluid discharging passages 24 is formed into a substantially rectangular shape when seen in a cross-sectional view, and thereby a cross-sectional area of each of thefluid discharging passages 24 is set to be larger than a cross-sectional area of each of thefluid supplying passages 23. - A
circumferential groove 25 is formed at thesecond electrode member 17 so as to open toward a lower side of thesecond electrode member 17. Thecircumferential groove 25 communicates with an upstream side of thefluid supplying passages 23. A downstream side of thefluid discharging passages 24 opens toward a second outercircumferential surface 26 of thesecond electrode member 17 so that the electrolytic solution naturally flows from thefluid discharging passages 24 down to theelectrolytic solution container 1. - The fixed
plate 19, formed into a substantially annular-plate shape, includes a circular-shaped recessedsurface portion 27 at a central portion thereof. The circular-shaped recessedsurface portion 27 is coaxially provided with thepiston insertion hole 20, and a diameter of the circular-shaped recessedsurface portion 27 is substantially the same as a diameter of thepiston insertion hole 20. A circular-shaped protrudingsurface portion 28 is coaxially formed at a central portion of the circular-shaped recessedsurface portion 27. The circular-shaped protrudingsurface portion 28 supports an end surface of the piston A in a state where the axis of the piston A extends in the upper-lower direction. - A connecting
fluid passage 29 is formed at the fixedplate 19. The connectingfluid passage 29 is connected to the supplyingpassage 7. Further, the connectingfluid passage 29 opens toward an upper surface of the fixedplate 19 so as to be in communication with thecircumferential groove 25 of thesecond electrode member 17. - The
movable plate 18 is formed with a circular-shaped through-hole 30, which is coaxially provided with thepiston insertion hole 20 and whose diameter is substantially the same as thepiston insertion hole 20, and thereby themovable plate 18 is formed into a substantially annular shape having a substantially rectangular-shaped cross section. - The piston A is held by the holding means (the first electrode member) 15 so that the piston A for processing is electrically connected to the
anode terminal 4 a in a state where the axis of the piston A extends in the vertical direction. The piston A is inserted through the circular-shaped through-hole 30 of themovable plate 18 and through thepiston insertion hole 20 of thesecond electrode member 17. The piston A is provided on the circular-shaped protrudingsurface portion 28 so that the lower end surface of the piston A contacts the circular-shaped protrudingsurface portion 28. Consequently, the piston A is coaxially positioned with the circular-shaped through-hole 30, thepiston insertion hole 20 and an inner circumferential surface of the circular-shaped recessedsurface portion 27 so as to include a predetermined interval for an entire circumference between the first outercircumferential surface 22 of the piston A and each of the circular-shaped through-hole 30, thepiston insertion hole 20 and the inner circumferential surface of the circular-shaped recessedsurface portion 27. -
Elastic seal members 31 are respectively provided between thesecond electrode member 17 and themovable plate 18 and between thesecond electrode member 17 and the fixedplate 19. Theelastic seal members 31 are respectively provided at both sides of the first piston ring groove A1 in a width direction thereof so as to seal a clearance B generated between the first outercircumferential surface 22 of the piston A and the innercircumferential surface 21 of thepiston insertion hole 20. - More specifically, the
elastic seal members 31 are respectively arranged at a first steppedportion 32 and a second steppedportion 33. The first steppedportion 32 is formed at a lower circumferential corner portion of themovable plate 18, which surrounds the circular-shaped through-hole 30, so as to face an upper surface of thesecond electrode member 17. The second steppedportion 33 is formed at a circumferential corner portion of the fixedplate 19, which surrounds the circular-shaped recessedcircumferential portion 27, so as to face a lower surface of thesecond electrode member 17. - Each of the
elastic seal members 31 is configured by a substantially annular-shaped elastic O ring, which is made of a nonconductive material (insulator), such as rubber and the like, and which includes a circular-shaped cross-section. A depth D of each of the first and second steppedportion elastic seal members 31. - A thrusting
mechanism 34 thrusts theelastic seal members 31 relative to thesecond electrode member 17 in the width direction of the first piston ring groove A1 so that theelastic seal members 31 protrude toward the outercircumferential surface 22 of the piston A, and thereby theelastic seal members 31 are elastically deformed so as to seal the clearance B generated between the outercircumferential surface 22 of the piston A and the innercircumferential surface 21 of thepiston insertion hole 20. The thrustingmechanism 34 is switchable between a thrusting state for thrusting theelastic seal members 31 and a released state for releasing the thrusting of theelastic seal members 31. - The thrusting
mechanism 34 includes a guide, a plurality of first compression springs 35, a plurality of second compression springs 36 and a thrusting member. The guide guides thesecond electrode member 17 and themovable plate 18 so that each of thesecond electrode member 17 and themovable plate 18 is movable in the upper-lower direction. The plurality of first compression springs 35 bias thesecond electrode member 17 and themovable plate 18 so that thesecond electrode member 17 and themovable plate 18 are spaced away from each other in the upper-lower direction. The plurality of second compression springs 36 bias thesecond electrode member 17 and the fixedplate 19 so that thesecond electrode member 17 and the fixedplate 19 are spaced away from each other in the upper-lower direction. The thrusting member thrusts themovable plate 18 toward the fixedplate 19 against a spring force of the first and second compression springs 35 and 36. - Before and after anodizing, as illustrated in
FIG. 2 , in the released state where the thrustingmechanism 34 releases the thrusting of theelastic seal members 31, the clearance B is generated between the outercircumferential surface 22 of the piston A and the innercircumferential surface 21 of thepiton insertion hole 20. Therefore, the piston A may easily be attached/detached. - At the time of anodizing, as illustrated in
FIG. 3 , in the thrusting state where the thrustingmechanism 34 thrusts theelastic seal members 31, the clearance B, generated between the outercircumferential surface 22 of the piston A and the innercircumferential surface 21 of thepiston insertion hole 20, is sealed by means of theelastic seal members 31, respectively provided at upper and lower sides of the first piston ring groove A1, thereby an annular spacedportion 37 is generated at a portion, which is sealed by theelastic seal members 31, and where the innercircumferential surface 21 of thepiston insertion hole 20 faces the first piston ring groove A1 for an entire circumference so as to include a predetermined clearance therebetween. - Each of the
elastic seal members 31 are relative to thesecond electrode member 17 in the width direction of the first piston ring groove A1 so that each of theelastic seal members 31 protrude toward the outercircumferential surface 22 of the piston A, and thereby the clearance B is sealed. Therefore, the annular spacedportion 37 is generated without covering the innercircumferential surface 21 by means of theelastic seal members 31. Consequently, an entire circumferential surface of the innercircumferential surface 21 may be utilized in order to energize the piston A and thesecond electrode member 17. - Accordingly, the
second electrode member 17 is downsized. When thesecond electrode member 17 is made of a noble metal, such as platinum for example, a less amount of noble metal material may be required, and therefore a cost may be reduced. - Each of the plurality of
fluid supplying passages 23 and each of the plurality offluid discharging passages 24 are formed so as to open at the innercircumferential surface 21 alternately in a circumferential direction so as to include the interval between the adjacent passages. Therefore, supplying of the electrolytic solution to the annular spacedportion 37 and discharging of the electrolytic solution from the annular spacedportion 37 are smoothly executed. Consequently, an amount of the electrolytic solution supplied to the annular spacedportion 37 per time unit and an amount of the electrolytic solution discharged from the annular spacedportion 37 per time unit are increased. Accordingly, a temperature of the electrolytic solution within the annular spacedportion 37 is less likely to increase. - The cross-sectional area of each of the
fluid discharging passages 24 is set to be larger than the cross-sectional area of each of thefluid supplying passages 23. Therefore, a pressure increase of the electrolytic solution within the annular spacedportion 37 is restricted. Consequently, the supplying of the electrolytic solution to the annular spacedportion 37 and the discharging of the electrolytic solution from the annular spacedportion 37 are smoothly executed. Accordingly, accumulation of the electrolytic solution in the annular spacedportion 37 may be avoided and a temperature increase of the electrolytic solution within the annular spacedportion 37 may be avoided. - In a state where the
elastic seal members 31 are thrust, the lower surface of thesecond electrode member 17 and the upper surface of the fixedplate 19 contact each other, and the connectingfluid passage 29 communicates with thecircumferential groove 25 of thesecond electrode member 17. - The supplying
control portion 9 controls the operation of the supplyingpump 8 so that the electrolytic solution is supplied to the oxidizingportion 3 when thrusting of theelastic seal members 31 by means of the thrustingmechanism 34 is detected, and so that the supplying of the electrolytic solution to the oxidizingportion 3 is canceled when a release of the thrusting of theelastic seal members 31 by means of the thrustingmechanism 34 is detected. - When the thrusting
mechanism 34 starts to thrust theelastic seal members 31, air remains at the annular spacedportion 37. However, while the supplying of the electrolytic solution to the annular spacedportion 37 is being started, the remaining air is removed through thefluid discharging passages 24, and the removed air is then substituted in the electrolytic solution. - According to the above-described anodizing, the air remaining within the annular spaced
portion 37 is substituted in the electrolytic solution, and then the electrolytic solution is supplied from thefluid supplying passages 23 to the annular spacedportion 37 while discharging the electrolytic solution within the annular spacedportion 37 from thefluid discharging passages 24 to theelectrolytic solution container 1. Thus, the piston A and thesecond electrode member 17 are energized via the electrolytic solution, filled in the annular spacedportion 37, so that a surface of the first piston ring groove A1 is oxidized, and an alumite coating, whose thickness is even, is formed along a longitudinal direction (a circumferential direction) of the first piston ring groove A1. The electrolytic solution flows substantially horizontally through thefluid supplying passages 23, the annular spacedportion 37 and thefluid discharging passages 24. - The anodizing apparatus according to the embodiment may include a thrusting mechanism, which is configured to be manually operated so as to switch the thrusting state for thrusting the
elastic seal members 31 and the released state for releasing the thrusting of theelastic seal members 31. - The anodizing apparatus according to the embodiment may be adapted not only for anodizing but also for surface processing, such as plating, in which a processing subject is immersed in a processing liquid and is applied with electric current.
- Accordingly, a clearance B between the annular-shaped inner
circumferential surface 21, formed at thesecond electrode member 17, and the first piston ring groove A1, formed at the first outercircumferential surface 22 of the piston A is sealed by means of the annular-shaped non-conductiveelastic seal members 31 at both sides of the first piston ring groove A1 in the width direction thereof. Consequently, the annular spacedportion 37, which is sealed by theelastic seal members 31, is generated at a portion where the innercircumferential surface 21 of thesecond electrode member 17 faces the first piston ring groove A1 of the piston A so as to include the predetermined interval therebetween. The annular spacedportion 37 is sealed by theelastic seal members 31, which are thrust relative to thesecond electrode member 17 in the width direction of the first piston ring groove A1 by means of the thrustingmechanism 34 so as to be elastically deformed. The innercircumferential surface 21, formed at thesecond electrode member 17, is not covered by theelastic seal members 31. Therefore, the entire circumferential surface of the innercircumferential surface 21 may be utilized in order to energize the piston A and thesecond electrode member 17. Accordingly, a size of thesecond electrode member 17 may be reduced. The electrolytic solution is supplied from thefluid supplying passage 23, formed so as to open at the innercircumferential surface 21 of thesecond electrode member 17, to the annular spacedportion 37, and then the electrolytic solution, supplied to the annular spacedportion 37, is discharged from thefluid discharging passage 24, formed so as to open at the innercircumferential surface 21 of thesecond electrode member 17. At that time, the piston A and thesecond electrode member 17 are energized via the electrolytic solution, filled in the annular spacedportion 37, and thereby the surface of the first piston ring groove A1 is oxidized so as to form the coating. The annular-shaped innercircumferential surface 21 of thesecond electrode member 17 faces the first piston ring groove A1 of the piston A via the annular spacedportion 37. Therefore, density of an electric current may easily be uniformed along the first piston ring groove A1, and a coating, whose thickness is even along the longitudinal direction of the first piston ring groove A1, may easily be formed. Further, the thrustingmechanism 34 is switchable between the thrusting state for thrusting theelastic seal members 31 and the released state for releasing the thrusting of theelastic seal members 31. Therefore, when the thrustingmechanism 34 is switched to the released state for releasing thrusting of theelastic seal members 31, the piston A may easily be attached/detached. Accordingly, a plurality of processing subjects may be effectively processed. - The fluid supplying passage and the fluid discharging passage include a plurality of fluid supplying passages and a plurality of fluid discharging passages, respectively. Each of the plurality of fluid supplying passages and each of the plurality of fluid discharging passages are alternately arranged in a circumferential direction so as to include an interval therebetween. The plurality of fluid supplying passages and the plurality of fluid discharging passages are formed so as to open at the inner circumferential surface of the second electrode member.
- When an electric current, having a high voltage, is applied in order to effectively form a coating in a short time, a temperature of the electrolytic solution within the annular spaced
portion 37 may easily increase and a dielectric breakdown (burning) of the coating may occur. However, according to the configuration of the embodiment, each of the plurality offluid supplying passages 23 and each of the plurality offluid discharging passages 24 are formed so as to open at the innercircumferential surface 21 alternately in a circumferential direction so as to include the interval between the adjacent passages. Therefore, supplying of the electrolytic solution to the annular spacedportion 37 and discharging of the electrolytic solution from the annular spacedportion 37 are smoothly executed. Consequently, an amount of the electrolytic solution supplied to the annular spacedportion 37 per time unit and an amount of the electrolytic solution discharged from the annular spacedportion 37 per time unit are increased. Accordingly, a temperature of the electrolytic solution within the annular spacedportion 37 is less likely to increase. Since the electrolytic solution is effectively cooled, even when the electric current, having a high voltage is applied, the dielectric breakdown of the coating is less likely to occur. Accordingly, the coating whose thickness is even along the longitudinal direction of the first circumferential groove A1, may be effectively formed in a short time. - The cross-sectional area of the fluid discharging passage is set to be larger than a cross-sectional area of the fluid supplying passage.
- When an electric current, having a high voltage, is applied in order to effectively form a coating in a short time, a temperature of the electrolytic solution within the annular spaced
portion 37 may easily increase and a dielectric breakdown (burning) of the coating may occur. However, according to the configuration of the embodiment, the cross-sectional area of each of thefluid discharging passages 24 is set to be larger than the cross-sectional area of each of thefluid supplying passages 23. Therefore, a pressure increase of the electrolytic solution within the annular spacedportion 37 is restricted. Consequently, the supplying of the electrolytic solution to the annular spacedportion 37 and the discharging of the electrolytic solution from the annular spacedportion 37 are smoothly executed. Accordingly, accumulation of the electrolytic solution in the annular spacedportion 37 may be avoided and a temperature increase of the electrolytic solution within the annular spacedportion 37 may be avoided. Since the electrolytic solution is effectively cooled, even when the electric current, having a high voltage is applied, the dielectric breakdown of the coating is less likely to occur. Accordingly, the coating whose thickness is even along the longitudinal direction of the first circumferential groove A1, may be effectively formed in a short time. - The fluid supplying passage and the fluid discharging passage are formed at the second electrode member.
- Accordingly, the
second electrode member 17 is utilized in order to form thefluid supplying passage 23 and thefluid discharging passage 24. Therefore, an anodizing apparatus may be downsized. - The fluid supplying passage and the fluid discharging passage are arranged so as to extend radially outwardly from a center of the second electrode member toward an outer circumferential surface of the second electrode member.
- The principles, preferred embodiment and mode of operation of the present invention have been described in the foregoing specification. However, the invention which is intended to be protected is not to be construed as limited to the particular embodiments disclosed. Further, the embodiments described herein are to be regarded as illustrative rather than restrictive. Variations and changes may be made by others, and equivalents employed, without departing from the spirit of the present invention. Accordingly, it is expressly intended that all such variations, changes and equivalents which fall within the spirit and scope of the present invention as defined in the claims, be embraced thereby.
Claims (9)
1. An anodizing apparatus comprising:
a first electrode member electrically connected to a processing subject, made of metal and formed with a circumferential groove at an outer circumferential surface thereof;
a second electrode member including an inner circumferential surface, formed into an annular shape and facing each of the outer circumferential surface of the processing subject and the circumferential groove of the processing subject so as to include an interval between the second electrode member and each of the outer circumferential surface of the processing subject and the circumferential groove of the processing subject;
elastic seal members being nonconductive, respectively formed into an annular shape, and respectively provided at both sides of the circumferential groove in a width direction thereof for sealing a clearance generated between the outer circumferential surface of the processing subject and the inner circumferential surface of the second electrode member; and
a thrusting mechanism thrusting each of the elastic seal members relative to the second electrode member in the width direction of the circumferential groove of the processing subject, and thereby elastically deforming each of the elastic seal members so as to seal the clearance, wherein
the thrusting mechanism is switchable between a thrusting state for thrusting the elastic seal members and a released state for releasing the thrusting of the elastic seal members, and wherein
a fluid supplying passage, through which an electrolytic solution is supplied to the circumferential groove of the processing subject, and a fluid discharging passage, through which the electrolytic solution, supplied to the circumferential groove of the processing subject, is discharged, are formed so as to open at the inner circumferential surface of the second electrode member.
2. The anodizing apparatus according to claim 1 , wherein
the fluid supplying passage and the fluid discharging passage include a plurality of fluid supplying passages and a plurality of fluid discharging passages, respectively,
each of the plurality of fluid supplying passages and each of the plurality of fluid discharging passages are alternately arranged in a circumferential direction so as to include an interval therebetween, and wherein
the plurality of fluid supplying passages and the plurality of fluid discharging passages are formed so as to open at the inner circumferential surface of the second electrode member.
3. The anodizing apparatus according to claim 1 , wherein
the cross-sectional area of the fluid discharging passage is set to be larger than a cross-sectional area of the fluid supplying passage.
4. The anodizing apparatus according to claim 2 , wherein
the cross-sectional area of the fluid discharging passage is set to be larger than a cross-sectional area of the fluid supplying passage.
5. The anodizing apparatus according to claim 1 , wherein
the fluid supplying passage and the fluid discharging passage are formed at the second electrode member.
6. The anodizing apparatus according to claim 2 wherein
the fluid supplying passage and the fluid discharging passage are formed at the second electrode member.
7. The anodizing apparatus according to claim 3 , wherein
the fluid supplying passage and the fluid discharging passage are formed at the second electrode member.
8. The anodizing apparatus according to claim 4 , wherein
the fluid supplying passage and the fluid discharging passage are formed at the second electrode member.
9. The anodizing apparatus according to claim 2 , wherein
the fluid supplying passage and the fluid discharging passage are arranged so as to extend radially outwardly from a center of the second electrode member toward an outer circumferential surface of the second electrode member.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2009008720A JP2010163672A (en) | 2009-01-19 | 2009-01-19 | Anodization treatment apparatus |
JP2009-008720 | 2009-01-19 |
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US20100181188A1 true US20100181188A1 (en) | 2010-07-22 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/648,614 Abandoned US20100181188A1 (en) | 2009-01-19 | 2009-12-29 | Anodizing apparatus |
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US (1) | US20100181188A1 (en) |
JP (1) | JP2010163672A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102653876A (en) * | 2012-05-31 | 2012-09-05 | 无锡市喷特环保工程有限公司 | Circulating system for piston aluminum oxidation tank liquid |
US20130043122A1 (en) * | 2010-05-27 | 2013-02-21 | Aisin Seiki Kabushiki Kaisha | Surface treatment apparatus |
CN103382569A (en) * | 2012-05-02 | 2013-11-06 | 湖北韩泰智能设备有限公司 | Hard anodizing apparatus for aluminum piston |
WO2017084837A1 (en) * | 2015-11-19 | 2017-05-26 | Mahle International Gmbh | Method for coating at least one piston groove provided on a piston with a protective coating and coating device, in particular for carrying out the method |
CN113748232A (en) * | 2019-02-27 | 2021-12-03 | 株式会社万都 | Anodic oxidation apparatus |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101272971B1 (en) * | 2011-06-29 | 2013-06-10 | 동양피스톤 주식회사 | Surface treatment apparatus of piston |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4992704A (en) * | 1989-04-17 | 1991-02-12 | Basic Electronics, Inc. | Variable color light emitting diode |
-
2009
- 2009-01-19 JP JP2009008720A patent/JP2010163672A/en active Pending
- 2009-12-29 US US12/648,614 patent/US20100181188A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4992704A (en) * | 1989-04-17 | 1991-02-12 | Basic Electronics, Inc. | Variable color light emitting diode |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130043122A1 (en) * | 2010-05-27 | 2013-02-21 | Aisin Seiki Kabushiki Kaisha | Surface treatment apparatus |
CN103382569A (en) * | 2012-05-02 | 2013-11-06 | 湖北韩泰智能设备有限公司 | Hard anodizing apparatus for aluminum piston |
CN102653876A (en) * | 2012-05-31 | 2012-09-05 | 无锡市喷特环保工程有限公司 | Circulating system for piston aluminum oxidation tank liquid |
WO2017084837A1 (en) * | 2015-11-19 | 2017-05-26 | Mahle International Gmbh | Method for coating at least one piston groove provided on a piston with a protective coating and coating device, in particular for carrying out the method |
CN113748232A (en) * | 2019-02-27 | 2021-12-03 | 株式会社万都 | Anodic oxidation apparatus |
Also Published As
Publication number | Publication date |
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JP2010163672A (en) | 2010-07-29 |
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Owner name: AISIN SEIKI KABUSHIKI KAISHA, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WADA, TAKEYO;KATO, MASAKI;REEL/FRAME:023712/0770 Effective date: 20091216 |
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STCB | Information on status: application discontinuation |
Free format text: EXPRESSLY ABANDONED -- DURING EXAMINATION |