Static stiffness design of vertical lathe with steel-polymer concrete frame

Dunaj, Paweł; Dolata, Michał; Tomaszewski, Jan B.; Majda, P.

doi:10.1007/s00170-022-09391-x

Cited by 9 publications

(4 citation statements)

References 28 publications

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“…To select the suitable reduction method a sensitivity analysis was performed [ 20 ]. It included the determination of the significance of the impact of changing the parameters describing the foundation model on the dynamic properties of the considered structures.…”

Section: Methodsmentioning

confidence: 99%

Finite Element Modeling of Dynamic Properties of the Delta Robot with Base Frame

2022

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The paper presents the finite element modeling of the dynamic properties of a delta robot attached to a steel frame. A distinguishing feature of the proposed modeling method is the application of the Guyan reduction method in modeling of frame foundations. The frame in question was analyzed in two variants: (i) without attached robot and (ii) with attached robot. Based on the established model, the dynamic properties (i.e., natural frequencies, mode shapes, and frequency response functions) of the frame in the two variants were analyzed. The obtained results were then experimentally verified and validated. It was found that the developed model showed an average relative error for natural frequencies of 4.3% in the case of the frame and 5.6% in the case of the frame with the robot. The paper demonstrated the validity of the proposed model, allowing accurate and fast determination of robotic system dynamic properties.

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Section: Methodsmentioning

confidence: 99%

Finite Element Modeling of Dynamic Properties of the Delta Robot with Base Frame

2022

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“…This section contains an overview of the literature on the use of steel reinforcement to obtain equal stiffness for EG machine tool structures. Dunaj et al [27] and [28] developed lightweight steel-polymer concrete frames that have a 239 % improvement in modal damping ratio and 83 % less weight than a steel frame for a vertical lathe to improve machining stability. The performance of a lathe with a steel-polymer concrete frame revealed that the static stiffness of the lathe steel support system is increased by 30 % and an 83 % (on average 55 %) reduction in relative tool-workpiece frequency response function amplitudes when compared to the steel variant.…”

Section: Literature Reviewmentioning

confidence: 99%

Thermal Investigations on a CNC Lathe Fitted with a Dynamically Enhanced Steel-Reinforced Epoxy Granite Bed

Mula¹,

Thyla²,

Subramanian³

et al. 2023

sv-jme

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Polymer concrete or epoxy granite is becoming more popular for beds, bases, and other structures of precision machine tools, owing to its excellent damping characteristics. To realize the same static rigidity as that of the cast-iron structures, steel-reinforced epoxy granite (SREG) structures are being used. The vast differences in the thermal properties of steel and epoxy granite (EG) are likely to cause higher magnitudes of thermal error. This work aims to investigate the thermal behaviour of a computerized numerical control (CNC) lathe built with a novel dynamically enhanced SREG bed and compare its performance with the lathe with a cast iron bed. Experimental and numerical investigations have been carried out under cross-feed (CF) drive idle running conditions to determine the TCP deformation. The results reveal that the thermal error in the CNC lathe with SREG bed is 1.68 times that of the lathe with cast iron (CI) bed at 20 ºC and 1.8 times at 40 ºC environmental temperature variation chamber (ETVC) conditions. It could be identified that the heat generated in the CF is conducted to the steel guideways embedded in the SREG bed, but further heat transfer to the EG portion of the bed is impeded, and hence the heat accumulation that occurs in the guideways leads to higher magnitude of the thermal error. The experimentally validated numerical model is used to extend the investigations to study the effect of the idle running of the longitudinal feed drive (LF) and combined cross and longitudinal feed drives, on the thermal behaviour of the lathe.

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“…The case studies concerned a polymer concrete beam, the basic structural component of a machine tool frame that has been presented in [33,34]. The concept of the frame is based on the synergic use of steel (ensuring the assumed stiffness of the structure) and polymer concrete (increasing its ability to dissipate vibration energy).…”

Section: Research Objectmentioning

confidence: 99%

Mesoscale Modeling of Polymer Concrete Dynamic Properties

Dunaj

2023

Polymers

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There is a constant need to predict the dynamic properties of composite materials already at the design stage. A particularly attractive tool for achieving this goal is mesoscale finite element modeling. This paper presents the mesoscale modeling of the dynamic properties of polymer concrete. The method is based on finite element modeling and substructural identification. Substructural identification is a model updating technique based on frequency response functions. It enables the identification of model dynamic properties considering damping. The presented method is used to model the dynamic properties of a polymer concrete beam. In the first step, the mesoscale finite element model is built and then it is decoupled into substructures: a polymer matrix, aggregates, and an interfacial transition zone (ITZ). Next, the dynamic properties of the polymer matrix substructure are updated, and the model is reassembled. Then, second-stage updating takes place, which consists of determining the parameters of the aggregates and the ITZ. The use of substructural identification made it possible to determine the parameters of substructures that do not exist in an independent, isolated form like the ITZ. Moreover, it allows for determining the amount of damping that ITZ brings to the structure.

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Static stiffness design of vertical lathe with steel-polymer concrete frame

Cited by 9 publications

References 28 publications

Finite Element Modeling of Dynamic Properties of the Delta Robot with Base Frame

Finite Element Modeling of Dynamic Properties of the Delta Robot with Base Frame

Thermal Investigations on a CNC Lathe Fitted with a Dynamically Enhanced Steel-Reinforced Epoxy Granite Bed

Mesoscale Modeling of Polymer Concrete Dynamic Properties

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