The ability to recycle mechanical and structural materials at the end of their useful lifetime is of high importance. The use of non-conventional materials in these applications enables such recycling and provides a number of other advantages, including increased quality, better economics, protection of the environment, and reduction of energy consumption. New lightweight materials, which have similar properties to their more traditional alternatives, are therefore highly significant for some industrial applications. In machine-tool design, for example, it is important to reduce the mass of the moving parts to obtain better dynamic characteristics. The current use of the term ‘lightweight materials’ refers to the lighter metallic materials such as aluminium, titanium, and magnesium. However, in recent years, the application of alternative, recyclable materials has substantially increased, for example the use of polymer concrete for supports, casing, or tables in machine tools with lighter weight and improved thermodynamic properties. An advantage of hollow-sphere-composites (HSC), which mostly consist of hollow spheres with different particle proportions and a reactive resin system, is that they can be recycled with ease. The aim of this article is to evaluate and characterize the mechanical and thermal properties of HSC as necessary input parameters for the design of various machine-tool and robotic system elements. The versatility of HSCs for machine tools and jig design is also demonstrated.
Recurrent neural networks with long term temporal dependencies in machine tool wear diagnosis and prognosis