Dynamic analysis on fabricated mineral cast lathe bed

Selvakumar, A S; Ganesan, K.; Mohanram, P. V.

doi:10.1177/0954405412467141

Cited by 14 publications

(9 citation statements)

References 11 publications

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“…Figure 5 shows the decay graphs of the amplitude by time: The damping coefficient values by the Logarithmic Decrement Method [29] calculated for the three materials are shown in Table 1: The produced synthetic granite composite presented excellent average damping coefficient, 5.5 times greater than aluminum 6061 and 6.2 times greater than gray cast iron, two materials usually used in machine structures and precision equipment. These measured values of aluminum damping coefficient and cast iron [30][31][32], as well the damping coefficient measured by the granite composition [8,33]. These results show the advantage of synthetic granite for the vibrations absorption in mechanical structures, compared to metals traditionally used for this purpose, inciting its application in structures of machine tools and measurement machines.…”

Section: Resultssupporting

confidence: 54%

Synthetic granite composite for precision equipment structures

Lovo¹,

Pedroso²,

Erbereli³

et al. 2018

Matéria (Rio J.)

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The structure is a component that plays an extremely important role in the equipment's performance, it must withstand efforts without compromising the function, receive and transfer heat, dampen vibrations and position the elements, as well as promote ergonomics and aesthetics. In lightweight and precision equipment's the raw material used must also allow thin walls, rigid, resistant and low density. The objective of the present work is the development of a synthetic granite composite for manufacturing of equipment's structures. For this, an abundant Brazilian granite, a high strength epoxy resin and segmented carbon fibers were selected as materials. Test specimens, with maximized packing with granite gravel less than 2.0 mm were fabricated and tested for tensile strength, compression, flexural, damping, hardness, dilatometry, thermal conductivity and density. The maximized composition supported flexural stresses above 42 MPa, without fiber reinforcement and 51 MPa with carbon fiber reinforcement. The damping coefficient was about 7 times higher than cast iron, coefficient of thermal expansion of 1.4E-05 m/m.K, thermal conductivity coefficient of 1.2 W/m.K and density of 2.1 g/cm³. The developed composite showed potential for refining structures, with ease of molding of thin-walled elements, use of inserts, re-machining, providing economical manufacture of single parts, and is still able to perform the function with high damping coefficient and low weight.

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Section: Resultssupporting

confidence: 54%

Synthetic granite composite for precision equipment structures

Lovo¹,

Pedroso²,

Erbereli³

et al. 2018

Matéria (Rio J.)

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“…It was observed that the damping ratio of epoxy granite bed is improved by 2.2 times greater than cast iron bed. The weight of the epoxy granite lathe bed in comparison with cast iron bed was reduced by 38.64 % for same stiffness [7].…”

Section: Structure Redesignmentioning

confidence: 92%

Stiffness and Damping of Epoxy Granite

Ubale¹,

Nimbalkar²,

Chavan³

2020

IJEAT

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The productivity and accuracy of machine tools now became most significant as the cutting conditions changes continuously. Therefore to withstand against these cutting conditions the machine tool structural material must have higher stiffness and damping. This review deals with various research works to study the stiffness and damping of epoxy granite or polymer concrete. It is reported that the epoxy granite shows improved damping and high strength to weight ratio than that of conventional machine tool structures of steel and cast iron.

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“…3 Polymer concrete with viscoelastic matrix (basalt and quartzite with 10% epoxy resin) was observed to provide noteworthy increase in damping (up to 160 Hz) when compared to cast iron material. 4 Selvakumar et al 5 investigated on polymer concrete (PC) lathe bed and it was found that PC lathe bed have 2.2 times higher damping and 38.64% reduction in weight when compared to the cast iron lathe bed. Mahendrakumar et al 6 developed a micro-lathe bed using Himalayan nettle polyester composite as an alternative material to investigate its static and dynamic characteristics.…”

Section: Introductionmentioning

confidence: 99%

Structural investigation of steel-reinforced epoxy granite machine tool column by finite element analysis

Venugopal

Kalayarasan

Thyla

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part L:

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Higher damping with higher static stiffness is essential for improving the static and dynamic characteristics of machine tool structures. The structural vibration in conventional machine tools, which are generally made up of cast iron and cast steel, may lead to poor surface finish and the dimensional inaccuracy in the machined products. It leads to the investigation of alternative machine tool structural materials such as concrete, polymer concrete, and epoxy granite. Although epoxy granite has a better damping capacity, its structural stiffness (Young's modulus) is one-third as compared to cast iron. Therefore, the present work represents optimization of the structural design of the vertical machining center column by introducing various designs of steel reinforcement in the epoxy granite structure to improve its static and dynamic characteristics using experimental and numerical approaches. A finite element model of the existing cast iron vertical machining center column has been developed and validated against the experimental data obtained using modal analysis. Furthermore, finite element models for various epoxy granite column designs have been developed and compared with the static and dynamic characteristics of cast iron column. A total of nine design configurations for epoxy granite column with steel reinforcement are evolved and numerical investigations are carried out by finite element analysis. The proposed final configuration with standard steel sections has been modeled using finite element analysis for an equivalent static stiffness and natural frequencies of about 12–20% higher than cast iron structure. Therefore, the proposed finite element model of epoxy-granite-made vertical machining center column can be used as a viable alternative for the existing column in order to achieve higher structural damping, equivalent or higher static stiffness and, easy and environmental-friendly manufacturing process.

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Dynamic analysis on fabricated mineral cast lathe bed

Cited by 14 publications

References 11 publications

Synthetic granite composite for precision equipment structures

Synthetic granite composite for precision equipment structures

Stiffness and Damping of Epoxy Granite

Structural investigation of steel-reinforced epoxy granite machine tool column by finite element analysis

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