Helical Coil Spring Seal Concentric Layer Welding
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Solution Overview
Problem
Fabricating helical coil spring type seals where all C-shaped rings share the same center point is challenging, especially when layers have different diameters, as existing methods struggle to align and weld them correctly.
Innovation Solution
A method involving determining specific diameters for absorption, cylinder-sealing, and piston-sealing layers, followed by producing C-shaped rings using sheet metal stamping or 3D printing, and using a stepped welding holder to ensure concentric alignment during welding, with subsequent grinding to achieve the desired dimensions and sealing effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If C-shaped rings are welded individually to form layers with different diameters, then the sealing function is improved, but the alignment precision deteriorates
Solution Approach 1:
A centering fixture serves as an intermediary tool during the welding process. The fixture includes a base plate with a central hole and positioning features that guide the C-shaped rings to align concentrically. Each ring is positioned on the fixture and welded in place, ensuring all layers share the same center point even with different diameters.
Solution Approach 2:
The centering fixture is prepared in advance with positioning features and alignment markers. The inner and outer diameters of each layer are predetermined based on the sealing requirements (inner diameter larger than piston, outer diameter smaller than cylinder). This preliminary preparation ensures that when rings are welded individually, they automatically align to the correct concentric positions.
2Reliability
If layers are made with different diameters for specific sealing surfaces, then the sealing effectiveness is improved, but the manufacturing complexity increases
Solution Approach 1:
Different layers of the helical coil spring seal are given different local qualities in terms of diameter. The cylinder-sealing layers have outer diameters larger than the cylinder internal wall, the absorption layers have intermediate diameters, and the piston-sealing layers have inner diameters smaller than the piston. This local differentiation optimizes sealing effectiveness at each specific location while the centering fixture maintains manufacturing manageability.
Data Source
AI summary
The present invention relates to a method for fabricating a helical coil spring type seal. The method of the present invention is able to make the stacked layers of ring sharing the same center point during the making of the helical coil spring type seal.