Conventional Lathe Remanufacturing into CNC Machine Tool: Uncertainty Modeling Approach

Abstract

Aims: Uncertainty modeling to study possibility of proposing several remanufacturing alternatives of conventional lathe into CNC machine tool.
 Study Design: Conventional lathe into CNC machine remanufacturing-upgrading experience is used to project the suitable literature comparatively to construct uncertainty modeling. Faults modes of conventional lathe are studied to propose different remanufacturing solution based on faults literature viewpoints in field of lathe remanufacturing-upgrading, which are reviewed and modified to accommodate new changes that can accompany the current case study.
 Place and Duration of Study: Middle Technical University, Institute of Technology-Baghdad, Mechanical Techniques Department, between January 2020 and July 2020.
 Methodology: Decision making for selection of remanufactured alternatives and remanufacturing portfolio alternatives in field of lathe remanufacturing are reviewed. Experience in field of lathe remanufacturing is exploited to remodeling of existence models to optimize a remanufactured lathe into CNC machine as a case study. Methodology can be concluded into:-
 
 Literature survey to find two paths of:
 Faults and their statutes study.
 Remanufacturing portfolio study.
 Literature re-presentation and modeling.
 Literature results graphical modeling.
 Mathematical modeling of remanufacturability.
 Restoration alternative modeling
 Modeling of uncertainty.
 
 Results: Emerged technology aided conventional lathe into CNC lathe remanufacturing alternative exhibits good behavior of criteria toward optimization. While Advanced technology aided conventional lathe into CNC lathe remanufacturing alternative exhibits behavior to be of interesting ability to be a reservoir of developing potentials. Conventional technology aided conventional lathe remanufacturing alternative is of lower potentials to be developed into optimum solution.
 Conclusion: Remanufacturing-upgrading of conventional lathe into CNC machine in its mechanical part, it is merely traditional remanufacturing process of conventional lathe. Developing potentials can include that gearbox can be eliminated due to use of motorized axis, feed rod and lead screws, in both forward and transvers directions, can be replaced with motorized ball screws. Also tool post can be replaced with automatic tool changer while dovetail guide ways and saddles can be reused. Comparative literature based analysis and experience based analysis for uncertainty reduction can substitute the leak of relevant data acquisition for decision-making in field of remanufacturing. Uncertainty reduction modeling can enable simplify certain difficulties, the calculation of some criteria and adopting of simplified analysis methods so that theoretic and practical gap can be directed towards certain actual conditions to reach the optimum solution.

Control Parameter Optimization-Based Machining Control Technology of State-of-the Art Computer Numerical Control Machine Tools

“…At present, the current loop, speed loop and position loop of three closedloop PID control technology are widely used in the servo system of CNC machine tools. However, the efficiency of this PID parameter tuning method is not high, and the work experience of the tuning engineer is required to be high, because the design and parameter tuning of AC servo system is particularly important [26][27][28]. In order to analyse the dynamic and static quality of AC servo system, a mathematical model, usually ordinary differential equation, is needed to describe the dynamic physical law of the system.…”