Marco Leonesio

Holistic Approach for Jointly Designing Dematerialized Machine Tools and Production Systems Enabling Flexibility-Oriented Business Models

Machine tools and production systems are traditionally designed in two separate stages, thus severely penalize the possibility to match customer production requirements. This work introduces the concept of dematerialization for machine tools and systems whose design principles answer to energy savings and cutting edge performance requirements across their lifecycles. The proposed approach consists of four main steps: new business total-life cycle services, design of dematerialized machine tools, process planning and configuration of production system solutions. The benefits coming from the adoption of machine and system dematerialization strategy have been addressed with reference to an industrial case study.

An integrated framework for combined designing dematerialised machine tools and production systems enabling flexibility-oriented business models

The current work outlines an innovative production system design and management approach based on the concept of dematerialisation whose major purpose is to reduce the amount of material, energy and degrees of flexibilities of machine tools and systems to the minimum requirements based on the user needs. The successful introduction of this new generation of Dematerialised Machines and Systems relies on a structured design framework. It starts from an accurate identification of the business models driving the company strategy and the identification of specific markets where the dematerialisation principle is a winning leverage to compete. Based on the analysis of production demand and the reference market context, the framework presents a set of methodologies related to the pallet configuration and process planning, the machine tool configuration and the system configuration, all nested together. The benefits of the Dematerialisation framework will be investigated with regard to a set of benchmarks coming from the industrial practice.

Model and Analysis of a Novel Piezo-Electric Rotational Motor Based on Deformation Wave Precession

The paper describes the functional behavior of a piezo-actuated rotary motor, based on a novel declination of the travelling wave principle, patented in 2015. A structural model is developed by the Finite Elements approach, together with the equations describing the adopted stiction and stepping mechanism. The geometrical locus corresponding the set of equations is described in the space of imposed piezo displacements. The solution indicates the maximum allowable torque and velocity, as a function of the motor design parameters.

Parametric and non-parametric identification of micromilling dynamics

Monitoring and control of micromilling process represents a challenging task in metal cutting. The lack of static and dynamic stiffness due to the small tool size represents one of the most importa ...

A Virtual Components Approach for Energy Consumption Modeling in the Machinery Sector

In recent years, energy consumption issues, boosted by environmental concerns, are becoming of paramount importance in the manufacturing field. In particular, machinery sector has been the theatre of several initiatives and projects aimed at an eco-efficient design and use of the machines. In this context, energy consumption modeling is considered a powerfull tool to foresee and optimize energy efficiency by design. On the other side, while each company has to develop numerical models of the internally designed machine elements, it has to be taken into account that machine productivity, eco-performance and cost are all strongly influenced by the employed commercial components (e.g. motors, sensors, controllers, transmissions, guide ways), that must be also be modeled but it is unrealistic to expect that the machinery builder develops by himself all required models.In this paper, the industrial adoption of simulation tools and methodologies for energy consumption modeling is regarded as an application of the more general “Model Based Product Development” methodology. In particular, the development of “functional component models”, seen as Virtual Components (“VC”) to be assembled in the Virtual Machine, is suggested as the key to foster co-modeling activity involving suppliers. A proper business model is then proposed to guarantee the sustainability of the co-operation scenario.Finally, the strategy concept is illustrated by some examples concerned with machine tool accessories and components.Copyright

An Integrated Methodolgy for Fixture Design in Mesoscale Machining Taking Into Account Cutting Process Dynamics

In this paper an approach for limiting regenerative chatter in meso-milling operations is discussed, based on the optimal selection of work piece dynamic compliance, to be obtained by using stiffness-adjustable work piece holder devices, called “fixels”. In order to investigate the phenomenon, a FEM model of a meso-machine tool has been developed and coupled with the fixels model. Then, the cutting capability enhancement due to the tuned fixels has been evaluated for a significant meso-milling operation with a commercial tool.Copyright