Abstract
Precision machinery employs a variety of materials for its structures: welded steel, cast iron, mineral cast, ultra-high-performance concrete, and natural stone. The machine tool industry requires high control on the geometrical and dimensional stability of the machine structure in order to ensure precise and accurate parts in the micrometer range. This means that even the smallest deviation from the nominal values of the machine tool can result in unacceptable part tolerances. For this work, comparative experiments were set up to analyze and evaluate the influence of load on the creep behavior of three classes of materials: mineral cast, ultra-high-performance concrete, and natural stone.
Highlights
Machine tools are designed to be operated over an extensive period of time in the tenth of thousands of hours [1]; the long-term stability of the employed materials is a crucial topic
The structures of machine tools (MTs), typically embodied by columns and beds, as shown in Fig. 1, have the task to guarantee the correct geometry of the machine elements under static, dynamic, thermal loads, and media exposure; they are fundamental components
If the regular check and maintenance of the machine tool’s levelling is not correctly performed, it can lead to wrong positioning of the MT, which results in long-term stress concentrations in the structure and, creep
Summary
Machine tools are designed to be operated over an extensive period of time in the tenth of thousands of hours [1]; the long-term stability of the employed materials is a crucial topic. The structures of machine tools (MTs), typically embodied by columns and beds, as shown, have the task to guarantee the correct geometry of the machine elements under static, dynamic, thermal loads, and media exposure; they are fundamental components Their thermo-mechanical behavior depends on the geometry, dimensions, and material properties. Machine tools demand high stiffness and moderate strength, which leads to the design for stiffness [3] This means that on one hand, stresses are low, far below the strength of the materials, but on the other hand, MTs require stability in the micrometer range under loads and within infinite time; even a minor creep can cause a problem. If the regular check and maintenance of the machine tool’s levelling is not correctly performed, it can lead to wrong positioning of the MT, which results in long-term stress concentrations in the structure and, creep
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