CMM-Guided Part Assembly for Multi-Axis Precision Alignment
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Solution Overview
Problem
Existing automated assembly technologies struggle to achieve high-precision manufacturing of complicated structures due to limitations in measurement and positioning accuracy, relying on expensive fixturing systems and image-based methods that are computationally intensive and inaccurate.
Innovation Solution
A metrology-assisted manufacturing method using a coordinate measuring machine for precise measurement and positioning of parts, allowing for accurate assembly by establishing a common frame of reference and applying a curable adhesive to fix parts in a predetermined spatial relationship, independent of substrate accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If image-based positioning methods are used for automated assembly, then automation extent is improved, but measurement precision deteriorates due to computational intensity and accuracy limitations
Solution Approach 1:
The patent replaces image-based optical positioning with a coordinate measuring machine (CMM) that uses tactile probes to physically measure part features. This substitution of mechanical measurement for optical imaging achieves higher positioning accuracy (micrometer-level vs. pixel-level) while maintaining automated assembly capability through programmatic control of the CMM and subsequent robotic positioning.
Solution Approach 2:
The patent introduces a coordinate measuring machine as an intermediary device between the part and the assembly system. The CMM measures part features and provides precise coordinate data that serves as an accurate reference for positioning subsequent components, eliminating the need for direct image-based positioning while enabling automated assembly through data integration.
2Manufacturing precision
If expensive fixturing systems are used to achieve high positioning accuracy, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent enables the part itself to provide positioning information through its measurable features (holes, edges, surfaces) that the coordinate measuring machine can directly measure. This eliminates the need for external fixturing systems to establish references, as the part's own geometry serves as the positioning基准, reducing device complexity while maintaining high manufacturing precision.
Solution Approach 2:
The patent replaces mechanical fixturing systems with a coordinate measuring machine that digitally captures part features. Instead of using physical fixtures to constrain and position parts, the system uses tactile measurement to obtain coordinate data, which is then used for precise positioning, thereby eliminating complex mechanical fixturing while achieving high positioning accuracy.
3Manufacturing precision
If coordinate measuring machine is used for both measurement and positioning, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent makes the coordinate measuring machine multi-functional by enabling it to perform both measurement and positioning functions. The CMM measures part features to obtain coordinates, then uses those same coordinates to position subsequent components through integrated control. This consolidation of measurement and positioning in one device improves manufacturing precision while the shared hardware and software reduce overall system complexity compared to separate systems.
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
Enables high-precision assembly of parts with accuracy limited only by the coordinate measuring machine, eliminating the need for complex fixturing and ensuring precise alignment of components, even on imperfect substrates.
Implementation Method 1
using a coordinate measuring machine both to obtain (coordinate) measurements of a first (already-assembled) part of the article
Implementation Method 2
to position a second part of the article in a predetermined spatial relationship relative to the first part in dependence upon the (coordinate) measurements of the first part
Implementation Method 3
applying a curable adhesive to fix parts in a predetermined spatial relationship
Data Source
AI summary
A method of manufacturing an article, including using coordinate measuring machine both to obtain three-dimensional point coordinate measurements of first part of article in place and to position a second part of article in predetermined spatial relationship relative to first part in dependence upon measurements of first part. Predetermined spatial relationship is defined in more than three degrees of freedom. Positioning second part relative to first part includes controlling machine to move second part relative to first part in more than three degrees of freedom. Machine is controlled to hold first and second parts in predetermined spatial relationship while performing an operation to fix both parts in predetermined spatial relationship. Second part is not in direct contact with any other part of article when first and second parts are in predetermined spatial relationship, at least not in a manner which would interfere with or influence or affect predetermined spatial relationship.