Abstract
Problem statement: The advancements in machine tools to maximize the production by increasing spindle speeds have caused vibration in machine tools. The two functional requirements of machine tool bed for machine tools are high structural stiffness and high damping, which cannot be satisfied simultaneously if conventional metallic materials such as cast iron are employed. Hence there is a need to replace cast iron with alternate materials. Approach: The objective of this study is to improve the stiffness, natural frequency and damping capability of machine tool bed using a composite material containing welded steel and polymer concrete. Welded steel material has high stiffness but low damping and polymer concrete has high damping but low stiffness. So in this study, a machine tool bed made of sandwich structures of welded steel and polymer concrete is designed and manufactured. Modal and static analyses were conducted numerically and experimentally to determine the modal frequencies, damping ratio, deformation and strain. Results: The results at first mode showed that the natural frequency improved by 24.7% and damping ratio was 2.7 times higher than cast iron. The comparison of strain and deformation also showed significant improvement. Conclusion: This study proposed a hybrid welded steel bed as a replacement for cast iron as a machine tool bed material and the results showed that the static and dynamic characteristics were superior to cast iron.
Highlights
Materials and this will continue in the future
Materials used in manufacturing machine tools, especially when viewed in terms of their mechanical characteristics, have a great importance in comparison to other construction resistance, ease of production, workability, stiffness and damping, conventional materials such as cast iron are least preferred (Kalpakjian and Schmid, 2009; Acherkan et al, 2000) Cast iron, a traditional material used in the manufacture of structural components of a machine tool possesses these characteristics to an acceptable level
A machine tool bed made of Steel Fiber reinforced Polymer Concrete (SFPC) was fabricated and analyzed to estimate their static and dynamic properties
Summary
Materials and this will continue in the future. But when viewed in terms of properties such as chemical. A machine tool bed made of Steel Fiber reinforced Polymer Concrete (SFPC) was fabricated and analyzed to estimate their static and dynamic properties. Damping frequency versus acceleration curve was used to properties of polymer concrete and cast iron were determine modal parameters i.e., natural frequency and measured and compared. This will help to identify if the The loads are detected by the proving ring’s dial natural frequency coincide with operating frequency indicator and noted.
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