Injector Coating Accuracy via Localized Masking
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Solution Overview
Problem
Existing injector components face challenges in achieving precise coating dimensions, particularly in transition zones between uncoated and coated regions, leading to inaccuracies especially in high-volume components.
Innovation Solution
The injector component features a coating restricted to the end face of a base body, with a maximum at the outer half and no coating on the outer lateral side, allowing for precise control and high accuracy in the coating process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If galvanic coating is applied to the entire component surface, then coating coverage is improved, but coating accuracy deteriorates in transition zones
Solution Approach 1:
The patent applies coating only to specific local areas (end faces and inner lateral surfaces) rather than the entire component surface. This is achieved through a masking device that selectively exposes only the required surfaces to the coating process, thereby achieving high coating accuracy in transition zones while simplifying the overall coating process by reducing the coated area.
Solution Approach 2:
The coating process is segmented into distinct zones: coated end faces, coated inner lateral surfaces, and uncoated outer lateral surfaces. The masking device divides the component surface into coated and uncoated regions, allowing precise control over where coating is applied, thus resolving the contradiction between coverage and accuracy.
2Manufacturing precision
If coating is applied to outer lateral surfaces, then complete surface coverage is improved, but external dimension accuracy deteriorates
Solution Approach 1:
The patent deliberately excludes the outer lateral surfaces from coating application, applying coating only to end faces and inner lateral surfaces. This local quality approach ensures that external dimensions remain accurate while still providing necessary coating coverage on functional surfaces.
Solution Approach 2:
The outer lateral surfaces are extracted from the coating process by using a masking device that prevents coating material from reaching these surfaces. This extraction maintains external dimension accuracy while the coating is still applied to the necessary functional areas.
3Manufacturing precision
If uniform coating thickness is applied across all surfaces, then coating consistency is improved, but functional performance deteriorates due to adhesion issues
Solution Approach 1:
The patent applies coating with controlled thickness to specific surfaces (end faces and inner lateral surfaces) where adhesion is critical, while leaving outer lateral surfaces uncoated. The masking device ensures consistent thickness on coated surfaces while preventing adhesion problems on outer surfaces through selective coating application.
Solution Approach 2:
The component surface is segmented into zones requiring different coating treatments: end faces and inner lateral surfaces receive uniform coating for consistency, while outer lateral surfaces remain uncoated to prevent adhesion issues. This segmentation resolves the contradiction between thickness consistency and adhesion performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables the highest demands for coating accuracy in the single μm range, preventing external dimension changes and ensuring precise adhesion reduction between armature and inner pole, thereby enhancing the performance and reliability of the injector.
Implementation Method 1
galvanic coating, in particular chromium-plating, in which case the workpiece to be coated is connected to a cathode and an anode dispenses the coating material via an electrolyte
Data Source
AI summary
An injector component of an injector for introducing a fluid is described as including a base body, a coating on at least one first end face of the base body, the coating having a maximum, which lies on an outer half of the base body, and an outer lateral surface of the base body does not have any coating.