Chemistry: electrical and wave energy – Apparatus – Electrolytic
Reexamination Certificate
1998-05-08
2001-02-06
Gorgos, Kathryn (Department: 1741)
Chemistry: electrical and wave energy
Apparatus
Electrolytic
C204S22400M
Reexamination Certificate
active
06183610
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for composite plating the inner surface of a cylindrical body such as an engine cylinder, etc.
There have been proposed a plurality of kinds of updraft flow apparatuses for composite plating the inner surface of a cylindrical body, wherein a rod shaped electrode is inserted in the cylindrical body, composite plating liquid, comprising plating liquid containing metallic ions and fine particles of antiabrasion materials, lubricants, etc. dispersed in the plating liquid, is made to flow upward in the annular space between the rod shaped electrode and the inner surface of the cylindrical body, and electric power is applied between the rod shaped electrode and the cylindrical body to composite plate the inner surface of the cylindrical body. An example of a conventional composite plating apparatus is shown in FIG.
3
.
In the conventional updraft flow apparatuses for composite plating the inner surface of a cylindrical body, the maximum current density is practically restricted to about 20 A/dm
2
because circumferential distribution of the flow velocity of the composite plating liquid in the annular space is uneven and the increase of the current density causes defects in appearance, such as burning, rough deposits, lack of plating, flaking, flowering, etc. Thus, the productivity of the composite plating work with the conventional updraft flow apparatuses for composite plating the inner surface of a cylindrical body is low.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an updraft flow apparatus for composite plating the inner surface of a cylindrical body, wherein a rod shaped electrode is inserted in the cylindrical body, composite plating liquid is made to flow upward in the annular space between the rod shaped electrode and the inner surface of the cylindrical body, and electric power is applied between the rod shaped electrode and the cylindrical body to composite plate the inner surface of the cylindrical body, which apparatus can achieve higher productivity of the composite plating work than conventional apparatuses.
In accordance with the present invention, there is provided an apparatus for composite plating the inner surface of a cylindrical body, wherein a rod shaped electrode is inserted in the cylindrical body, composite plating liquid is made to flow upward in the annular space between the rod shaped electrode and the inner surface of the cylindrical body, and electric power is applied between the rod shaped electrode and the cylindrical body to composite plate the inner surface of the cylindrical body, which apparatus comprises a baffle plate disposed above the cylindrical body to oppose the upward flow of composite plating liquid out of the annular space.
According to a preferred embodiment of the present invention, the apparatus further comprises a rectification cylinder disposed adjacent to the lower end of the cylindrical body and extending coaxially with the cylindrical body over a distance equal to or larger than the outside diameter of the annular space.
According to another preferred embodiment of the present invention, the apparatus further comprises a rectification cylinder disposed adjacent to the upper end of the cylindrical body and extending coaxially with the cylindrical body over a distance equal to or larger than the outside diameter of the annular space.
According to another preferred embodiment of the present invention, the apparatus further comprises a flow rate adjusting tank disposed below the cylindrical body. The flow rate adjusting tank is provided with an opening opposing the lower end of the annular space. In the apparatus, the composite plating liquid is made to flow from the flow rate adjusting tank into the annular space through the opening.
According to another preferred embodiment of the present invention, the flow rate adjusting tank is provided with a plurality of openings. A cylindrical body is set on each opening. In the apparatus, the composite plating liquid is made to flow from the flow rate adjusting tank into each annular space through each opening.
According to another preferred embodiment of the present invention, the apparatus further comprises a jig for fixing the cylindrical body to the apparatus for composite plating. The jig is provided with a composite plating liquid discharging hole which communicates with a port extending from the inner surface to the outside of the cylindrical body.
According to another preferred embodiment of the present invention, the composite plating liquid flowing upward out of the annular space and colliding with the baffle plate is scattered around the cylindrical body from the peripheral portion of the baffle plate. The composite plating liquid flowing down below the cylindrical body is recovered to be returned to the annular space.
According to another preferred embodiment of the present invention, the peripheral portion of the baffle plate is bent downward.
According to another preferred embodiment of the present invention, the apparatus further comprises an anti-splash wall disposed around the cylindrical body.
According to another preferred embodiment of the present invention, the composite plating liquid flowing upward out of the annular space and colliding with the baffle plate is recovered through a closed-circuit pipe without being scattered around the cylindrical body to be returned to the annular space.
Further objects, features and advantages of the present invention will become apparent from the Detailed Description of the Preferred Embodiment when read in conjunction with the accompanying drawings.
REFERENCES:
patent: 5295449 (1994-03-01), Maeda
patent: 5486272 (1996-01-01), Hemsley
patent: 5496463 (1996-03-01), Mori
patent: 5666933 (1997-09-01), Koriyama
patent: 52-093636 (1977-08-01), None
patent: 55-031006 (1980-03-01), None
patent: 55-31006 (1980-07-01), None
patent: 7-157899 (1995-06-01), None
patent: 52-93636 (1997-08-01), None
Beppu Masaaki
Kataoka Yoshiyuki
Ohtou Yasutoshi
Gorgos Kathryn
Griffin & Szipl, P.C.
Maisano J.
Nihon Parkerizing Co.,. Ltd.
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