Chuck with Variable Flow Resistance for Warped Workpiece Acquisition
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Solution Overview
Problem
Conventional chucks are inadequate for handling warped workpieces, as they require high suction levels that can strain the suction source and fail to efficiently acquire and flatten warped surfaces, leading to inconsistent grip and potential workpiece damage.
Innovation Solution
A chuck design with a distributed pattern of vacuum ports featuring varying flow resistances and adjustable suction levels, where regions with greater initial gaps from the workpiece surface have lower flow resistances to apply increased suction, and regions closer to the surface have higher resistances to maintain contact, along with sensors and valves to dynamically adjust inflow and maximize suction on acquired areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform high suction is applied across all vacuum ports to acquire warped workpieces, then the workpiece can be held securely, but the suction source becomes strained and energy consumption increases
Solution Approach 1:
The patent divides the chuck surface into multiple zones with different flow resistance characteristics. Vacuum ports in different zones have different flow resistances tailored to local requirements: ports near the center (where warped workpieces typically make first contact) have higher resistance to prevent excessive suction, while ports in outer regions have lower resistance to pull in warped areas. This local differentiation allows secure workpiece acquisition without requiring uniform high suction across the entire surface, thereby reducing overall energy consumption of the suction source.
Solution Approach 2:
The patent implements variable flow resistance parameters across different vacuum port zones. By changing the flow resistance parameter from port to port (or zone to zone) based on position and expected workpiece contact patterns, the system optimizes suction distribution. This parameter variation enables the suction source to operate at lower overall power levels while still achieving reliable workpiece acquisition and flattening.
2Shape
If high suction levels are applied to flatten warped workpieces, then the workpiece surface can be flattened effectively, but the workpiece may be damaged
Solution Approach 1:
Different zones of the chuck apply different suction levels to different regions of the workpiece. The flow resistance distribution creates a gradient where suction force is modulated according to position, allowing gentle flattening in contact zones while avoiding excessive force that could damage the workpiece. This localized suction control enables effective flattening without harmful over-suction.
Solution Approach 2:
The patent applies suction partially and progressively rather than uniformly and maximally. By using flow restrictors to limit and distribute suction flow, the system applies just enough suction to achieve flattening and acquisition without excessive force. The progressive nature of suction application through restricted flow prevents sudden high-force contact that could damage delicate workpieces.
3Device complexity
If uniform flow resistance is used across all vacuum ports, then the chuck structure is simple, but the suction distribution is inconsistent leading to poor workpiece acquisition
Solution Approach 1:
The patent implements spatially varying flow resistance across the chuck surface, dividing it into zones with different resistance characteristics. This local differentiation of flow resistance parameters creates optimized suction distribution patterns that adapt to typical workpiece warpage patterns, significantly improving acquisition reliability and consistency compared to uniform resistance designs.
Solution Approach 2:
The chuck is segmented into multiple functional zones with distinct flow resistance properties. Rather than treating all vacuum ports uniformly, the system segments the surface into regions (e.g., inner, middle, outer zones) each with tailored flow resistance values. This segmentation enables independent optimization of suction characteristics in different areas, improving overall workpiece acquisition consistency.
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 design efficiently acquires and flattens warped workpieces by optimizing suction distribution, enhancing the grip strength and accuracy of manipulation while reducing the risk of workpiece damage and strain on the suction source.
Implementation Method 1
a suction source that is operable to apply suction to the workpiece
Implementation Method 2
a flow restrictor located within each conduit of the plurality of conduits and characterized by a flow resistance
Data Source
AI summary
A chuck includes a chuck surface, a plurality of vacuum ports being distributed over the chuck surface. Each of the vacuum ports is open to a conduit that is connectable to a suction source that is operable to apply suction to that vacuum port. A flow restrictor is located within each conduit and is characterized by a flow resistance. The flow resistance of the flow restrictor in at least one conduit is less than the flow resistance of the flow restrictor in at least one other conduit.