Coating Quality Inspection for Bearing Holes Using Sacrificial Plugs
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Solution Overview
Problem
Existing methods for quality checking the coating on large metal parts with holes, such as large roller bearings, are inefficient and destructive, making it difficult to assess adhesive strength without damaging the component, which is critical for ensuring reliable protection against corrosion and wear.
Innovation Solution
A method involving inserting a metal plug into the hole of the metal part, coating both the plug and the part, and then inspecting the coated plug's surface for quality, allowing non-destructive assessment of the coating's quality without damaging the part, using a stopper that is designed to match the part's material and surface structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a quality check is carried out at individual points on the coated surface of large metal parts, then the coating quality can be assessed, but the checked surface section becomes a potential weak point and requires rework
Solution Approach 1:
The invention separates the quality inspection function from the main metal part by using a separate plug that can be removed after coating. The plug serves as a dedicated test specimen that undergoes the same coating process, allowing quality checks to be performed on the plug rather than on the critical surface of the metal part itself.
Solution Approach 2:
The invention extracts the quality testing function from the metal part by using a separate plug that is inserted into a hole in the part. This plug is coated together with the part and then removed for dedicated quality inspection, thereby removing the testing activity from the critical surface of the metal part.
2Measurement precision
If destructive quality tests are performed on small mass-produced components, then coating adhesive strength can be determined, but the components are damaged and disposed of
Solution Approach 1:
The plug serves as a disposable or sacrificial element that can be destroyed during quality testing without loss to the main metal part. After the plug is removed from the metal part, it can be subjected to destructive adhesive strength tests, and if necessary, the plug can be disposed of while the valuable metal part remains intact.
Solution Approach 2:
The plug acts as an intermediary element that transfers the coating from the metal part to a separate testable component. The plug is coated together with the metal part, then removed and used as a standalone specimen for quality testing, serving as a mediator between the coating process and the quality inspection.
3Manufacturing precision
If the coating process is complex for large metal parts, then proper coating can be achieved, but the testing procedure cannot be easily transferred to another metal part
Solution Approach 1:
The plug serves multiple functions: it is inserted into the metal part, undergoes the coating process together with the part, acts as a carrier for the coating, and finally serves as a universal test specimen for quality inspection. This multi-functionality makes the testing procedure highly transferable between different metal parts, as the same plug-based approach can be applied universally.
Data Source
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AI summary
The invention relates to a method for coating a metal part, in particular a large rolling bearing or large rolling bearing ring (1), provided with at least one hole (2), in particular a fastening hole, wherein a metallic plug (3) is inserted into the hole (2), wherein an exposed end face (4) of the plug (3) and a face of the metal part which adjoins the hole (2) are provided with a coating (5), wherein the plug (3) is removed from the hole (2) and wherein the end face (4) of the plug (3) which is provided with the coating (5) is subjected to quality testing which is routinely not non-destructive.