Threaded-Hole Rack Clamping for Low-Mark Anodizing
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Solution Overview
Problem
Rack apparatuses used for retaining workpieces during anodizing often result in marks or defects due to uneven ampere and solution densities at contact points, necessitating a reduction in contact areas to improve the appearance of the workpieces.
Innovation Solution
The rack apparatus employs a hanging frame with clamping assemblies that include connecting members with screw portions engaging threaded holes and latching members with notches, minimizing the contact area by using resisting members with corrosion-resistant materials to securely hold workpieces, thereby reducing physical contact and potential blemishes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If latching hooks are used to retain workpieces, then the workpiece is securely fixed to the rack apparatus, but marks or defects appear on the workpiece surface due to uneven ampere and solution density at contact points
Solution Approach 1:
The clamping assembly is divided into multiple components: connecting members with latching hooks, resisting members with wide contact surfaces, and insulating members. This segmentation allows different parts to perform specialized functions - the latching hooks provide secure retention while the resisting members distribute contact pressure and minimize harmful concentration at single points.
Solution Approach 2:
Resisting members act as intermediaries between the latching hooks and the workpiece. These members have wider contact surfaces that distribute the clamping force, preventing the concentration of ampere density and solution density at single contact points, thereby eliminating surface marks while maintaining secure retention.
2Reliability
If multiple latching hooks contact the workpiece, then the workpiece is securely retained, but the contact area increases causing more marks and defects
Solution Approach 1:
Different parts of the clamping assembly have different local qualities: latching hooks provide point contact for secure retention, while resisting members provide distributed contact surfaces that minimize harmful concentration. This local differentiation allows the system to achieve both secure retention and minimal harmful contact area.
3Reliability
If conventional clamping structures are used, then the workpiece is retained, but corrosion occurs at contact points affecting the appearance
Solution Approach 1:
The clamping assembly uses composite construction combining metal components (latching hooks and resisting members for mechanical strength) with insulating members (corrosion resistance). This composite approach allows the metal parts to provide secure retention while the insulating members protect against corrosion at contact points.
Data Source
AI summary
A rack apparatus used for retaining a workpiece having at least one threaded hole, includes a hanging frame, and at least one clamping assembly fixed on the hanging frame. Each clamping assembly includes a plurality of latching members and a plurality of connecting members detachably assembled on the latching members. Each connecting member includes a screw portion. At least one screw portion is engaged in a corresponding threaded hole of the workpiece.