CNC 3D Measurement Device for Automated In-Process Inspection
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Solution Overview
Problem
CNC machining centers require workpieces to be removed for inspection, leading to increased production time and operator intervention, as existing systems cannot perform inspections without stopping operations and require manual handling.
Innovation Solution
Integration of a non-contact 3D measurement device with a photogrammetry system into the CNC machining center, allowing for automated inspection without removing the workpiece, using a projector, cameras, and targets to determine 3D coordinates in a common frame of reference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If workpiece inspection is performed using traditional measurement devices, then measurement accuracy is improved, but production time increases and continuous operation is interrupted
Solution Approach 1:
The patent combines the measurement device with the machining center to create an integrated system. The measurement device is mounted on the machining center's spindle or tool holder, allowing inspection to be performed in the same workspace without removing the workpiece. This merging eliminates the need to transport workpieces to separate inspection areas and enables continuous operation.
Solution Approach 2:
The system enables continuous inspection during machining operations by using non-contact measurement methods. The measurement device can scan workpieces while they remain on the machining center, and the automated measurement process allows for immediate feedback without interrupting the production flow. Multiple workpieces can be measured in sequence without stopping the machining center.
2Adaptability or versatility
If workpiece inspection is performed manually, then measurement flexibility is improved, but operator intervention time increases
Solution Approach 1:
The measurement device is equipped with automated measurement capabilities that can independently scan, capture, and process workpiece data without operator intervention. The system includes automated positioning features and software that can identify and measure various features autonomously, reducing the need for skilled operators to manually position and measure each component.
Solution Approach 2:
The patent replaces manual mechanical measurement methods with automated optical or laser-based measurement systems. These non-contact measurement devices use light or laser beams to capture workpiece geometry, eliminating the need for physical contact and manual operation. The automated system can process multiple workpieces continuously without operator fatigue or intervention.
3Difficulty of detecting and measuring
If workpiece is removed from machining center for inspection, then measurement access is improved, but production efficiency decreases
Solution Approach 1:
The measurement device is integrated into the machining center's workspace, combining inspection capabilities with the machining environment. The device can be positioned close to the workpiece using the machining center's existing positioning mechanisms, providing adequate measurement access without requiring workpiece removal. The integrated system maintains the workpiece in its machining location throughout the inspection process.
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 continuous operation of CNC machining centers with automated, non-contact inspection of workpieces, reducing production time and operator intervention by registering 3D measurements directly within the machining center, thus improving efficiency and accuracy.
Implementation Method 1
a projector having a light source and at least one device camera arranged in a fixed geometric relationship, the at least one camera being arranged to receive light from the light source that is reflected off of a surface
Implementation Method 2
at least two photogrammetry cameras having a predetermined orientation and a field of view to acquire images of the plurality of targets
Data Source
AI summary
A computer numerical control (CNC) machining center is provided. The CNC machining center includes a spindle that receives a cutting tool. A work surface is operably arranged adjacent the spindle. A non-contact three-dimensional (3D) measurement device is operably coupled to the tool mount, the 3D measurement device including a projector and at least one device camera, the at least one camera being arranged to receive light from the light source that is reflected off of a surface. A plurality of targets is provided with at least one of the targets coupled to the 3D measurement device. At least two photogrammetry cameras are provided having a orientation and a field of view to acquire images of the targets. A controller is coupled for communication to the 3D measurement device and the at least two cameras, the controller determining the position of the 3D measurement device within the machining center during operation.