Precision CNC machining and ways to achieve it

Abstract

The quality of the part is characterized by precision of its processing. A good fit of the product parts and, as a consequence, its reliability in general depends on how accurately the size and shape of the part is maintained during machining. In this connection, the article considers the problem of ensuring the accuracy during machining of work pieces using CNC machines. Within the identified problem, the analysis of known technical solutions in this area was carried out and three main areas were identified: optimization of cutting conditions, improvement of the treated surface area according to the criteria for increasing the resistance of the cutting tool, as well as error tracking and correction during machining. The main disadvantages of the analyzed methods and inventions are complexity of their implementation, the need to equip the CNC machine with an adaptive control system, and a limited field of application. Therefore, a method for controlling the accuracy of shaft processing using mathematical and finite element modeling is proposed.

MechaTag: A Mechanical Fiducial Marker and the Detection Algorithm

“…However, it presents some light reflection issues, due to the material, and low contrast between marker and background, due to the fact that it is built directly on the same material to localize. We provide a mechanical marker made by a mechanical process with high precision as it was fabricated with a Computer Numerical Control (CNC) machine [35], and therefore it can lead to a more precise recognition. With respect to the state-of-the-art fiducial marker, it has been tested that MechaTag can be recognized in a high variety of working conditions (distance, orientation and illumination), while its material allows for its use for many industrial and research applications and in many environmental conditions.…”

The Processing of the Profile Surface of the Work-Pieces, Characterized by Low Rigidity

“…When profile milling of peripheral segments per one working pass of the cutting tool the allowance with thickness measured in tens of millimeters is removed, which causes a decrease in static and centrifugal moments of the cross section inertia of the original piece, the moment of resistance, and, consequently, rigidity and geometric accuracy of the machined surface. An important resource for improving the quality of products is the use of high-tech complex systems [51][52][53][54][55], as well as high-performance automated machines and computer systems [56][57][58][59][60][61]. Nowadays, there are no mathematical models of elastic displacements and flexural rigidity of extended workpieces with unstable dimensional, physical and mechanical characteristics [62][63][64][65], which makes it impossible to carry out design calculations and to obtain reliable results, on the basis of which it would be possible to develop effective milling processes for profile surfaces.…”