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Planning the coordinate measurements of a freeform surface after milling based on a cad model simulating the surface after machining

Werner Andrzej, Poniatowska Małgorzata

Acta Mechanica et Automatica

2024

Vol. 18, no. 4

730--736

This paper proposes the planning of coordinate measurements of freeform surfaces based on a model simulating the surface after machining. This model is created by the determination of a theoretical tool deflection during machining. The determined components of the simulated machining deviations are used in the reconstruction of the nominal CAD model of the surface into a model simulating the geometry of the surface after machining. This model is subdivided into areas corresponding to the assumed machining deviation intervals. This makes it possible to control the number and distribution of measuring points in separate sections of the manufactured surface. Coordinate measurements of the machined surface are made in areas where maximum deviations are expected. Here, the number and distribution of measuring points are controlled over a wide range. Coordinate measurements in other areas are carried out with significantly fewer points or may be omitted altogether. This approach makes it possible to reduce the measurement time without losing important information affecting the evaluation result. The method proposed in this paper has been tested on samples containing freeform surface. The test object was manufactured using a 3-axis milling technique with a spherical end mill.

Development of the Module for Real-Time Verification of NC Machining Program

Milojevic Z., Navalusic S., Zeljkovic M.

Journal of Machine Engineering

2007

Vol. 7, No. 1

51--60

In the simulation and verification of the NC machining programs most often approaches are: exact and approximate approach. For real-time NC machining program verification, only approximate approaches are suitable, by the reason of simulation cost O(N)( simulation time grows linearly with the number of tool movements). For the real-time purpose simulation it is important that simulation is not view-depended and animation should be smooth by 25 frames per second. In this paper a developed module for approximate approach verification of generated NC machine program for three axis milling is presented, based on dexels. Workpiece and tool are approximated by dexels, which are connected by triangular mesh. Depends on the computer hardware, workpiece and tool resolution may vary. This approach enables that tool and workpiece could be arbitrary shape. System is developed by use of 3D graphics library OpenGL which also, enables a stereo viewing, and that fact could be important in virtual reality era today. Machined workpiece could be transferred as a polygonal mesh in the some of commercial CAD systems for afterward analysis.