Method and device for controlling a workpiece during its manufacturing
AssigneeI-Mc
InventorsDOMINIQUE NOZAIS, ZILONG SHAO, JEAN-YVES HASCOET
Life of this patent
Estimating the term…
Abstract
A system to control a workpiece during its manufacturing in a machining system. The control being performed in the same manufacturing phase following machining operation. The workpiece being set in the work volume of the machining system. The check operation includes the acquisition of points on the surface of the part. The robot is moved by a cart so the robot can reach the protected working area. The measuring device is positioned relative to the workpiece by the robot. Acquisition of a plurality of points on the surface of the workpiece is performed. The position of the plurality points acquired is compared with the three-dimensional model stored in the memory of the computer.
Claims7
1-7. (canceled)
A device to control a workpiece clamped to a part holder in a machining system during a machining operation, the control being performed when the workpiece is in a machining system and in a same phase following the machining operation, the device comprising:
- the part holder to set and hold in position the workpiece in the machining system;
- a protected work area comprising an access to a work volume of the machining system;
- a measuring sensor to acquire a plurality of points on a surface of the workpiece;
- a poly-articulated robot located outside the work volume of the machining system and configured to hold and move the measuring sensor;
- a support carriage carrying the poly-articulated robot and configured to move the poly-articulated robot relative to the machining system;
- a computer comprising a memory, a processor and a display, the memory comprising a three-dimensional digital model of the workpiece and the computer configured to acquire coordinates of the plurality of points acquired by the measuring sensor;
- a position detector located in the protected work area to measure a position of the measuring sensor supported by the poly-articulated robot.
A method implementing the device of claim 1, comprising:
- performing the machining operation on the workpiece;
- uploading the three-dimensional digital model of the workpiece into the memory of the computer;
- moving the poly-articulated robot utilizing the support carriage to allow the poly-articulated robot to reach the protected work area;
- acquiring the coordinates of the plurality of points on the surface of the workpiece using the measuring sensor and recording the coordinates in the memory;
- comparing positions of the plurality of points acquired to the three-dimensional digital model stored in the memory;
- wherein the workpiece is contaminated by residues;
- adjusting a reference surface from the three-dimensional digital model to the coordinates of the plurality of points acquired;
- classifying dimensional deviations in the plurality of points acquired relative to the reference surface by classes;
- and
- determining a standard deviation of a distribution of the classes relative to the reference surface;
- excluding, from an analysis, points remote from the reference surface by more than one standard deviation.
Dependencies are inferred from the claim text.