Fixture Layout Synthesis for Stable, Collision-Free Part Clamping
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Solution Overview
Problem
Current methods for fixture configuration and planning in part manufacturing are primarily manual and experience-driven, failing to adequately address the challenges of determining optimal clamp locations for stability and immobility, especially in complex workpieces, and do not scale well with variations in workpiece geometry, leading to inefficiencies and increased costs.
Innovation Solution
A computer-implemented system and method that determines spatial locations of clamping points to ensure immobility and synthesizes a valid fixture layout by using geometric methods to reason about part shape, check interference, and match fixture elements from a library, ensuring accessibility and collision-free configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual and experience-driven methods are used for fixture configuration, then flexibility in handling complex workpieces is maintained, but productivity and manufacturing efficiency deteriorate due to time-consuming processes
Solution Approach 1:
The patent replaces manual, experience-driven fixture configuration with an automated computer-based system that uses geometric reasoning and algorithms to determine optimal clamp locations and fixture layouts, thereby eliminating the time-consuming manual process while maintaining adaptability through programmable geometric methods
Solution Approach 2:
The system changes the approach from qualitative experience-based decision-making to quantitative geometric parameter analysis, using mathematical models and computational geometry to automatically determine fixture configurations that adapt to different workpiece geometries
2Productivity
If automated fixture layout is implemented, then productivity and manufacturing efficiency are improved, but device complexity increases due to the need for geometric reasoning algorithms and computer systems
Solution Approach 1:
The patent uses digital geometric models and virtual representations of workpieces to perform fixture configuration analysis, creating a computational copy of the physical manufacturing process that can be analyzed and optimized before actual fixture fabrication, thereby managing complexity through information processing rather than physical complexity
Solution Approach 2:
The automated system breaks down the complex fixture configuration problem into discrete geometric reasoning steps and algorithmic components, segmenting the overall task into manageable computational stages that can be processed systematically by the computer system
3Manufacturing precision
If optimal clamp locations are determined through automated geometric methods, then manufacturing precision and part stability are improved, but loss of time occurs during the computational analysis phase
Solution Approach 1:
The system performs preliminary geometric analysis and clamp location determination through automated computational methods before actual manufacturing begins, pre-calculating optimal fixture configurations that ensure part stability and precision throughout the manufacturing process
Solution Approach 2:
The patent replaces iterative manual trial-and-error fixture configuration with direct automated geometric computation, substituting the time-consuming mechanical adjustment process with efficient algorithmic calculation that rapidly determines optimal clamp locations
4Adaptability or versatility
If modular fixtures are used to reduce fixture costs, then adaptability to different parts is improved, but reliability of achieving form-closure deteriorates due to the complexity of selecting and configuring modular components
Solution Approach 1:
The automated geometric reasoning system provides feedback loops that verify whether selected modular fixture components and clamp configurations will achieve the required form-closure, allowing iterative validation and adjustment of the fixture layout before final implementation
Data Source
AI summary
Automated fixture layout is approached in two distinct stages. First, the spatial locations of clamping points on the work piece are determined to ensure immobility of the fixtured part under any infinitesimal perturbation. Second, spatial locations are matched against a user-specified library of reconfigurable clamps to synthesize a valid fixture layout or configuration that includes clamps that are accessible and collision free. The spatial locations matching during the second stage can be the same spatial locations chosen in the first stage to ensure immobility, or a different set of spatial locations.