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Method for electroplating a cylindrical inside surface of a work-piece-extending substantially over a semi-circle

An inner surface, cylindrical technology, applied in the field of electroplating the cylindrical inner surface that actually extends beyond the semicircular workpiece, can solve the problems of structural complexity, sealing and guiding difficulties, etc., and achieve the effect of simple structural conditions

Inactive Publication Date: 2004-11-03
MIBA GLEITLAGER GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Difficulties in sealing the guidance of the semi-cylindrical supports through the two opposing walls of the bath tank have resulted in proposals (US 5,364,523A) to gradually lower and separate the semi-cylindrical supports with the aid of vertical conveyors into the tank, slide them horizontally and then take them out of the tank vertically again, which leads to a lot of structural complexity
And the difficulties associated with the impregnation process remain the same

Method used

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  • Method for electroplating a cylindrical inside surface of a work-piece-extending substantially over a semi-circle
  • Method for electroplating a cylindrical inside surface of a work-piece-extending substantially over a semi-circle
  • Method for electroplating a cylindrical inside surface of a work-piece-extending substantially over a semi-circle

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Embodiment Construction

[0026]According to FIG. 1 , the exemplary apparatus comprises a tank 1 above which is a fixture 2 for a workpiece 3 comprising a cylindrical inner surface 4 to be electroplated, exhibiting a semicircular cross-section, for example in the form of a semicylindrical The component representation. The fixture 2 consists of a slide guide 5 with two slides on which the axial surface of the workpiece 3 is supported. A guide 6 in the form of a rotor is coaxial with the inner surface 4 of the workpiece 3 and the rotor is driven by a shaft 7 in a speed-controlled manner. Said guide 6 is partly submerged in the electrolytic tank 8 to circulate electrolyte from the tank 8 through the gap 9 between the guide 6 and the inner surface 4 of the workpiece 3 . By choosing the dimensions of the gap 9 and the circulation speed of the guide means 6 it is possible in an advantageous manner to maintain a laminar flow of the electrolyte through the gap 9 and the metal layer to be electroplated on the ...

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Abstract

A method is described for electroplating a cylindrical inside surface of a work-piece extending substantially over a semi-circle, with an electrolyte being conveyed from a bath in a circulation through a gap between the inside surface and a revolving guide means. In order to ensure advantageous coating conditions it is proposed that the electrolyte is conveyed with the help of the guide means immersed only partly in the bath in the circumferential direction through the gap between the guide means and the work-piece guided outside of the bath.

Description

technical field [0001] The invention relates to a method for electroplating the cylindrical inner surface of a workpiece which extends substantially over a semicircle, in which electrolyte is circulated from a tank through the gap between the inner surface and a rotary guide. Background technique [0002] Because in electrolytic precipitation, the precipitation speed depends on the current density, the current density depends on the thickness of the boundary layer and the ion concentration, but mainly the ion concentration, and the ion concentration is affected by the movement of the bath solution. Electrolyte can be directed to force flow along the surface of the workpiece to be coated to increase the deposition rate. For this purpose, it is well known that when coating the surface of a semicircular support (US4399019A), the semicircular support is sequentially arranged in a frame along the coaxial direction, and simultaneously the semicircular support is arranged in the fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/16C25D7/04
CPCC25D5/16C25D7/04C25D5/605
Inventor 托马斯·朗夫
Owner MIBA GLEITLAGER GMBH
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