Spherical Component Coating via Dynamic Rotation and Oscillation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Uniformly coating the entire surface of spherical components, such as ball bearings, is challenging due to difficulties in manipulating the components during the deposition process in existing coating systems.
Innovation Solution
A method and table assembly that position spherical components within a containment boundary on a moving member, which revolves and oscillates within a vacuum chamber at sub-atmospheric pressures, ensuring all surface areas are exposed to the coating process, utilizing a closed field unbalanced magnetron sputtering system or other line-of-sight coating techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If spherical components are positioned statically in a coating chamber, then the coating process is simple to operate, but the coating uniformity across the entire surface is poor
Solution Approach 1:
The patent applies the dynamics principle by transforming the static positioning of spherical components into dynamic motion. The components are placed in a rotating drum that continuously tumbles them, ensuring all surfaces are uniformly exposed to the coating source. This dynamic approach resolves the contradiction by achieving uniform coating coverage without requiring complex manual manipulation of each component.
Solution Approach 2:
The rotating drum mechanism creates mechanical motion that continuously moves spherical components through different orientations and positions. This mechanical vibration/motion ensures that all surfaces of the spherical components are exposed to the coating flux from the sputtering target, achieving uniform coating thickness without complex operational intervention.
2Manufacturing precision
If vertically mounted sputtering targets are used to coat spherical components, then the coating system structure is simple, but the entire surface area of spherical components cannot be uniformly exposed to the coating process
Solution Approach 1:
Instead of using multiple complexly positioned stationary targets, the patent employs a single target combined with a rotating drum that dynamically repositions the spherical components. This dynamic solution achieves complete surface coverage while maintaining relatively simple system structure.
Solution Approach 2:
The patent inverts the conventional approach by keeping the coating target stationary and instead moving the workpieces (spherical components) through rotation and tumbling motion. This inversion achieves uniform all-around coating coverage without requiring complex multi-target configurations.
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 approach ensures uniform and homogeneous coating of spherical components by creating a random-like motion that maintains constant exposure to the sputtering targets, resulting in a dense and adherent coating microstructure.
Implementation Method 1
sputtering is a specific physical vapor deposition (PVD) coating process in which an inert gas, such as argon, is ionized in a vacuum chamber containing the component to be coated and a sputtering target. The argon ions bombard the sputtering target, dislodging target material atoms that then strike and coat the component
Implementation Method 2
reducing the pressure within the chamber to less than 101,3 kPa (one atmosphere)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method of coating spherical components with a coating process in which the spherical components have a surface area includes positioning the spherical components within a containment boundary on a moving member and positioning the moving member within a chamber. The method includes reducing the pressure within the chamber to less than one atmosphere. The method also includes revolving the moving member about a longitudinal axis. The method further includes oscillating the moving member in a direction of the longitudinal axis and commencing the coating process. The oscillating and revolving produce motion of the spherical components within the containment boundary such that an entirety of the surface area of each component is exposed to the coating process.