Workpiece Point-Cloud Measurement Without Prebuilt 3D CAD
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Solution Overview
Problem
Existing workpiece measurement methods require pre-prepared three-dimensional CAD data, which limits their ability to adapt to changes in size and shape, and cannot identify weld lines without such data.
Innovation Solution
A method and system that acquire three-dimensional point cloud data, estimate boundary frames using defined conditions, and optimize these frames with an evaluation function to identify the shape and position of workpieces without relying on pre-existing CAD data, incorporating touch-sensing for enhanced accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If three-dimensional CAD data is used for measurement, then measurement precision is improved, but adaptability to size and shape changes deteriorates
Solution Approach 1:
The patent creates a virtual model (copy) of the workpiece from point cloud data obtained through touch sensing, rather than relying on pre-existing CAD data. This virtual model can be generated for any workpiece configuration, providing both measurement precision and adaptability to size and shape changes.
Solution Approach 2:
The patent changes the fundamental parameter from using fixed CAD data to using dynamically acquired point cloud data. By transitioning from static design data to actual measured data, the system achieves both precision (through accurate sensing) and adaptability (through direct measurement of actual workpiece geometry).
2Measurement precision
If pre-prepared three-dimensional model data is used, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The system performs self-measurement by using the workpiece itself as the measurement target and generating its own measurement data through touch sensing. This eliminates the need for external CAD data preparation and reduces system complexity while maintaining measurement accuracy.
Solution Approach 2:
The patent replaces the mechanical/CAD data preparation system with an automated touch sensing system. Instead of manually creating or importing 3D models, the system automatically acquires geometric data through coordinated sensing and processing, reducing operational complexity.
3Measurement precision
If three-dimensional CAD data is required for weld line identification, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The system creates a virtual copy of the workpiece geometry from point cloud data, enabling weld line identification directly from the measured model. This eliminates the need to access or prepare CAD data, improving ease of operation while maintaining precision through accurate geometric representation.
Solution Approach 2:
The system performs preliminary measurement and creates a complete geometric model before welding operations begin. This preliminary action captures all necessary geometric information, eliminating the need for subsequent CAD data retrieval or preparation during operation.
Data Source
AI summary
The shape and the position of a workpiece are measured without having to prepare three-dimensional CAD data in advance. A workpiece measurement method for measuring a shape and a position of a workpiece constituted of a plurality of components includes: an acquiring step for acquiring three-dimensional point, cloud data of the workpiece; an outline estimating step for estimating at least one boundary frame indicating an outline corresponding to each of the plurality of components by using the point cloud data and a condition defined in correspondence with the shape of the workpiece serving as a measurement target; and an optimizing step for optimizing the at least one boundary frame estimated in the outline estimating step by adjusting a parameter in accordance with an evaluation function, and identifying a shape of each of the plurality of components.