On-line Measuring System for Machining Machine Calibration
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Solution Overview
Problem
Traditional machining processes require separate measurement systems that are not suitable for large workpieces and cannot be calibrated on-line for non-integrated machining machines, limiting their applicability.
Innovation Solution
An on-line measuring system comprising a scanning unit, CAD processing unit, point cloud data processing unit, degree of freedom processing unit, and basis setting unit, which continuously scans a workpiece to obtain global and local data, compare geometric features to determine degrees of freedom, and set a system basis for calibration and deviation measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a traditional separate measuring system is used to measure work pieces, then measurement can be performed, but the work piece must be moved to the measuring system which affects production line efficiency and is not suitable for large work pieces
Solution Approach 1:
The patent merges the measuring system with the machining machine to create an integrated system. The laser scanner and control unit are integrated into the machining machine structure, allowing measurement to be performed in-situ without moving the work piece, thereby maintaining production line efficiency and eliminating handling difficulties for large work pieces
2Productivity
If a machining machine is integrated with a measuring system, then on-line measurement is enabled, but the coordinates are calibrated before shipping and the system is only applicable for that specific machining machine
Solution Approach 1:
The patent implements a universal coordinate calibration method that can be applied to any machining machine. The system uses a calibration object with known geometric features and employs iterative optimization algorithms to determine transformation parameters between coordinate systems. This approach makes the measuring system adaptable to different machining machines without requiring machine-specific calibration, thereby achieving both on-line measurement capability and broad machine compatibility
3Device complexity
If a machining machine is not integrated with any measuring system, then it can be simpler, but it cannot be calibrated on line
Solution Approach 1:
The patent enables the machining machine to perform its own calibration through the integrated measuring system. The calibration process uses the machining machine's own motion capabilities and the laser scanner to automatically determine coordinate transformation parameters. This self-calibration approach maintains relatively simple system structure while achieving high measurement precision through automated iterative optimization algorithms
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 on-line calibration and deviation measurement of machining machines without being fixed to a specific machine, making the system applicable for any machining machine and facilitating efficient production line operations.
Implementation Method 1
The scanning unit includes a laser emitter and a laser receiver. The laser emitter is used for continuously scanning a work piece. The laser receiver is used for receiving a reflection data reflected from the work piece
Implementation Method 2
The laser receiver is used for receiving a reflection data reflected from the work piece to obtain a global point cloud data
Data Source
AI summary
An on-line measuring system, a datum calibrating method, a deviation measuring method and a computer-readable medium are provided. The datum calibrating method includes following steps. A work piece is scanned by a scanning unit to obtain a global point cloud data. A local CAD data of the work piece is obtained according to a predetermined range. A local CAD geometric feature of the local CAD data is obtained. A local point cloud data of the global point cloud data is obtained according to a local range corresponding to the predetermined range. A local scanning geometric feature of the local point cloud data is obtained. The local scanning geometric feature and the local CAD geometric feature are compared to obtain at least one spatial freedom limit. A system basis is obtained according to six spatial freedom limits, if the number of the at least one spatial freedom limit reaches six.