Coated Seal Ring Masking for Isotropic Sealing Band Finishing
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Solution Overview
Problem
Isotropic finishing processes can remove corrosion coatings from seal rings, compromising their corrosion resistance and durability, especially in high-pressure and high-speed machinery applications where seal rings face severe service conditions.
Innovation Solution
A method involving the application of a corrosion-resistant coating to the seal ring followed by isotropic finishing, where a mask is used to protect the coated areas, ensuring the sealing band is polished while maintaining the coating's integrity, and using a masking member with circumferential grooves to position the seal ring for effective polishing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If isotropic finishing process is applied to the seal ring, then surface finish quality is improved, but corrosion coating is removed
Solution Approach 1:
The corrosion coating is applied to the seal ring before the isotropic finishing process. This preliminary application ensures that the coating is in place to protect the sealing band during finishing, preventing coating removal while achieving the desired surface quality.
Solution Approach 2:
A masking member with circumferential grooves is introduced as an intermediary tool. The grooves position the seal ring precisely during isotropic finishing, ensuring that only the sealing band is exposed to the finishing process while the corrosion coating on other areas is protected by the mask.
2Reliability
If mask is used to protect coated areas during isotropic finishing, then corrosion resistance is maintained, but process complexity increases
Solution Approach 1:
The masking member is segmented with circumferential grooves that create distinct zones. This segmentation allows precise control over which areas of the seal ring are exposed to isotropic finishing (only the sealing band) and which areas are protected (the corrosion-coated surfaces), simplifying the masking process while maintaining effectiveness.
3Manufacturing precision
If sealing band is polished while coating is protected, then surface finish is improved without compromising corrosion resistance, but manufacturing time increases
Solution Approach 1:
The masking member with circumferential grooves is designed to self-position the seal ring during the isotropic finishing process. The grooves automatically align the seal ring so that the sealing band is correctly positioned for polishing, eliminating the need for complex alignment procedures and reducing setup time.
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
The method enhances the corrosion resistance and durability of the seal rings by protecting the coating during the isotropic finishing process, ensuring a consistent surface finish and extended lifespan of the seal rings in harsh environments.
Implementation Method 1
The masking member defines a circumferential groove configured such that the seal ring is disposable within the circumferential groove with the loading surface covered by the masking member and the sealing band exposed
Implementation Method 2
The sealing band is polished by an isotropic finishing process after a layer of coating composition is applied to at least the body
Data Source
AI summary
A seal ring for a seal assembly includes a body and a seal flange. The body is generally cylindrical, extending along a longitudinal axis between a load end and a seal end. The seal flange is disposed adjacent the seal end of the body, projecting radially in a circumscribing manner from the body. The seal flange includes a sealing face having a sealing band for sealing contact with a mating seal ring. A layer of coating composition formulated to help increase the corrosion resistance of the seal ring is applied to at least the body. A mask is applied to the seal ring to cover at least a portion of the seal ring having the layer of coating composition applied thereto such that the sealing band remains exposed. The sealing band is polished by an isotropic finishing process. The mask is removed after the sealing band is isotropically polished.