Reverse Engineering Mesh to CAD Rounding
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Solution Overview
Problem
Conventional three-dimensional measurement apparatuses struggle to accurately reflect the design intention of users when converting extracted geometric elements into CAD data, due to differences between measured coordinate or dimensional values and intended design values.
Innovation Solution
A reverse engineering support apparatus that includes a data acquisition unit, extraction unit, rounding unit, conversion unit, and output unit, which acquires mesh data, extracts geometric elements, rounds coordinate or dimensional values, and converts them into CAD data, allowing for selection between primary and secondary conversion modes based on tolerance and allowable degrees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If geometric element data is extracted from mesh data with high measurement precision, then measurement accuracy is improved, but the data deviates from design intention and manufacturing requirements
Solution Approach 1:
The patent applies parameter changes by rounding coordinate values and dimensional values of geometric element data to a coarser number of significant digits. This transformation changes the precision parameter from high measurement accuracy to a level suitable for manufacturing and design intention, resolving the contradiction between measurement precision and manufacturing precision
Solution Approach 2:
The patent introduces an intermediary processing step (rounding unit) between measurement and CAD conversion. This intermediary rounds the high-precision geometric element data to appropriate significant digits before conversion, serving as a mediator that adapts measurement data to manufacturing requirements
2Loss of information
If geometric element data is converted directly into CAD data without rounding, then measurement fidelity is preserved, but design intention cannot be reflected
Solution Approach 1:
The patent performs preliminary rounding of geometric element data before CAD conversion. By pre-processing the data to round coordinate and dimensional values to appropriate significant digits, the system prepares the data to reflect design intention while maintaining essential measurement information
Solution Approach 2:
The patent changes the precision parameter of geometric element data through rounding to a coarser number of significant digits. This parameter transformation enables the data to reflect design intention and manufacturing requirements while preserving the essential geometric information
3Manufacturing precision
If rounding is applied to geometric element data, then design intention is reflected, but processing complexity increases
Solution Approach 1:
The patent segments the CAD conversion process into distinct functional units: extraction unit, rounding unit, and conversion unit. This segmentation allows the rounding operation to be performed as a separate, manageable step with controllable parameters, reducing overall process complexity
Data Source
AI summary
CAD data, which can be directly used for a design drawing, can be easily created from geometric element following mesh data. Provided is a reverse engineering support apparatus that converts mesh data obtained by measuring a three-dimensional shape of a workpiece into CAD data and outputs the CAD data. The reverse engineering support apparatus includes: a data acquisition unit that acquires mesh data; an extraction unit that extracts geometric element data from the mesh data; a rounding unit that executes rounding on a characteristic value of the geometric element data extracted by the extraction unit; a conversion unit that converts the geometric element data subjected to the rounding into CAD data; and an output unit that outputs the CAD data.