Contributions to Multi-Criteria Optimization of Cutting Processing

Abstract

Based on the experimental research and of theoretical studies in the paper it is presented recommendations and possibilities for the multicriteria optimization of the machining processes. For the application, it is analyzed in this way, the case of the turning process, in special the operation of roughness. The results of the research are analyzed, in special, with the help of suggestive graphs, based on it is presented recommendations for the optimizations of the design and technological process for the machining production from energy consumption, costs and productivity point of view.

Experimental Research on Wear and Thermal Deformation for Shaft Gauge

“…Based on the existing information from ISO standard (STAS 8222-85) about the constructive and precision parameters of the gauges, mathematical adapted, and taking into consideration the mathematical model of the wear and thermic deformations fields obtained with the checking of a sufficient large number of experimental information (H), were obtained the next unitary mathematical models adequate for gauges projection [3]. Wear field U, estimated from the projection for all the dimensions "GO" in the new stage of the gauges, it is called also the minimal guaranteed wear U ming .…”

“…-d max , d min -are the maximum and minimum surface dimensions of the verified piece; z 1 , y 1, α 1 -the parameters that are defining the position of the tolerance execution fields of the active parts of the gauges in relation with d max , d min -Fundamental tolerances H, H 1 used for the calculation of the execution tolerances at the gauges dimensions by taking into consideration the nominal dimension d* of the verified piece (till 500mm) [3]:…”

New Algorithm for the Gauges Design

“…By taking into consideration the dependence of the wear field of the gauge for the serial production, N p and the experimental research [3], Fig. 3, it was deduced the mathematical models for the wear of the shaft gauge u p and the drill hole gauge u t : (4) (5) Using these mathematical models, it is imposed to determine the parameters z 1 , y 1 , which drive to the minimization of the gauges number and efficiently use this for a fabrication lot N p .…”

“…From theoretical point of view, the shape of the control end of the gauge corresponds to the shape of the conjugate piece which is being verified, that is drill hole, respectively shaft gauge for exterior diameter [3].…”

Factors that influence the quality constant of the manufacturing process for asphalt milling knifes

“…The research objective, that of obtaining better asphalt cutting mill knifes and their manufacturing process, was reached by equipping the knife support with an intelligent protection system to self-locking when the knife is spinning [1][2][3][4][5], figure 1, around its own axis and that of implementing in the simmered tungsten carbide reinforcement the wear self-protection system, made from rhomb grids by melting with laser bean [1][2][3]6]. …”