Design and dynamic analysis of three degrees of freedom desk-top reconfigurable machine
ABSTRACT This paper presents the development of three degrees of freedom (DOF) desk-top reconfigurable machine tool. Recently, numerous components or systems in various areas such as biomedical, Micro-Electro-Mechanical Systems (MEMs) often require dedicated and precise but cost efficient manufacturing process along with large fluctuations of product demands in a global market. These demands lead us to develop a downscaled desk-top manufacturing machine which reduces the size of a machine but offers to control multi-DOF motions rapidly and smoothly. In this paper, we first introduce the design concept of three DOFs desk-top reconfigurable machine and analyze both static and dynamic structure characteristics. The results show feasibility that the position and orientation of the machine tool can be controlled during the machining operation simultaneously. Then, the dynamic simulations and experimental results using a closed loop control with a position feedback are presented to demonstrate performance and feature of the system. Unlike conventional full scaled manufacturing machines, the machine developed here provides a number of advantages; light weight and fast dynamic response, simple design and low cost, compact but relatively large workspace without motion singularity.
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ABSTRACT: This article documents the design, refinement, and implementation of a reconfigurable machine tool that provides a flexible platform for turning and milling. Advances in the design and capabilities of machine tools drive modern industry. In fact, the expanding capabilities of the machines permit novel and economic changes in the manufacturing and design of products. After the flexible manufacturing (FMS) boom, a more recent, but no less significant, area of machine development involves the reconfiguration of milling machines. This reconfigurability can also be applied to lathe-mills. The present work demonstrates satisfactorily the reconfiguration characteristics of modularity, integrability, and convertibility. We prototype and test a completely functional bench top reconfigurable lathe mill machine implemented using a $10,000 USD budget and developed following a synthesized machine tool product development methodology that begins with concept design and cutting forces to end in prototyping. In addition to reasonable results in runout, positioning, and surface roughness, the machine demonstrates the capability to produce parts with a Cpk of 1.009, thereby demonstrating the ability to fabricate this type of machine in Mexico for the local jewelry industry.Journal of Manufacturing Systems 04/2013; 32(2):364–371. · 1.85 Impact Factor
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ABSTRACT: This paper proposes a design methodology and presents the results of applying the methodology in the design of a novel lathe-mill reconfigurable machine tool. Considerable research has been conducted in reconfigurable machines yet most of the work has been for mills and not for lathe-mills. The significant increase in efficiency and the reduced investment required for a reconfigurable manufacturing system (RMS) justifies this research. One important contribution of the present work is the design of a customizable and modular machine tool that is capable of performing both turning and milling operations. Moreover, a structured design methodology must be followed in order to achieve this design. Many generic machine design methodologies exist; most of these, however, focus on industrial applications. Thus, another significant contribution is a synthesized methodology for machine tool design specifically tailored to academic and research purposes. The crux of this methodology consists in the computation of the loads caused by the cutting forces. Turning and milling cutting force models provide the load conditions of the machine. With the resulting data, machine elements are selected to meet a ±0.05mm part precision specification. The component selection results in CAD drawings which complete the preliminary design phase of the synthesized methodology. These drawings are ready for use in the structural and dynamic analysis of the machine.Advanced Intelligent Mechatronics (AIM), 2010 IEEE/ASME International Conference on; 01/2010