Material selection in machine design: The change of cast iron for improving the high-quality Iin woodworking

Fragassa, Cristiano

doi:10.1177/0954406216639996

Cited by 27 publications

(26 citation statements)

References 20 publications

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“…Ductile cast irons (DCI), also known as nodular cast irons or spheroidal graphite irons, are widely used in complex shaped structural parts that need to obey simultaneously to specific requirements such as high mechanical strength, high fatigue resistance, wear resistance and ease of castability [1][2][3][4][5]. A compilation of a few interesting properties of cast irons can be found in [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Study of the Heat-Treatments Effect on High Strength Ductile Cast Iron Welded Joints

Gouveia

Silva

Paiva

et al. 2017

Metals

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Nowadays, ultimate tensile strengths above 400 MPa become usual for ductile irons, thus allowing the implementation of new design paradigms. Large concentrations of carbon and other influencing elements can negatively interfere with the welding process of ductile cast irons. Efforts made by researchers have led to the discovery of solutions which enable good enough operational results to consider welding as a viable repairing or joining method. Although these alloys have been available for quite some time, researchers have mainly focused on issues relating to microstructural phenomena tied to casting and similar processes, leaving much to explore in terms of their weldability. Thus, this work intends to investigate the effect of different heat-treatments on the weldability of a high strength ductile cast iron by assessing the mechanical properties of welded joints as well as structural modifications induced by thermal cycles imposed before and after welding. Successful weld joints were achieved showing a clear heat affected zone (HAZ) close to the joint area. This area is coincident with the fracture area of the welded samples when loaded on a tensile test bench, having obtained promising results regarding mechanical strength and strain. The hardness of the welded zone was also carefully investigated, showing clear changes throughout the joint.

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Section: Introductionmentioning

confidence: 99%

Study of the Heat-Treatments Effect on High Strength Ductile Cast Iron Welded Joints

Gouveia

Silva

Paiva

et al. 2017

Metals

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“…The vibration of circular saw blades represents a critical aspect for a safe and precise manufacturing [10][11][12][13], especially in modern cutting tool processing, where uncommon materials [14] or controlling solutions [15] are frequently adopted. It can be investigated by Finite Element Method comparing simulations and measures.…”

Section: Modelling and Fem Analysis Of Circular Saw Bladesmentioning

confidence: 99%

Variation of Natural Frequencies by Circular Saw Blade Rotation

2018

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Abstract:In this paper the influence of circular saw blade rotation, slot shapes and number of slots on its natural frequencies and critical speeds is investigated. Firstly, the governing equation that describes the transverse vibrations of a stationary circular plate clamped at its centre is derived using Hamilton's principle and based on KirchhoffLove plate theory and von Karman strain theory. The results are then compared with the ones obtained using FEM method and the FEM method is then applied to the real circular saw blade model. Finally, influence of slot shapes and number of slots on natural frequencies and critical speeds is investigated.

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“…High-performance machineries for industrial applications, such as high-speed automated assembly lines and machine tools, frequently experience vibrations induced by high dynamic loads, which are possibly detrimental for their operation (Altintas 2012, Liang et al 2013, Fragassa 2017. In practice, due to company production scheduling and resource issues, vibration issues are often detected at late steps of the design workflow, when the machine prototype is assembled and firstly tested.…”

Section: Introductionmentioning

confidence: 99%

Structural and Elastodynamic Analysis of Rotary Transfer Machines by Finite Element Model

Martini¹,

Troncossi²,

Vincenzi³

2017

JSSCM

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Vibration monitoring and control are central topics for machine tools, since high vibration levels reduce the quality of machined surfaces and shorten the tool life. In order to predict potential vibration issues since the early design stage, it is necessary to implement ad hoc numerical models for modal analysis. This requires significant efforts and possible conflicts with tight production scheduling of companies. This work focuses on a specific family of rotary transfer machines for the manufacturing of parts related to lock&keys industry. It investigates the possibility to achieve an acceptable estimation of the elastodynamic behavior of the machine tools through limited modifications of the Finite Element (FE) models used for structural analysis, which are generally available in the early phases of the design process. The structural FE model of a new machine tool is implemented and validated through experimental tests performed on a prototype. Then, the elastodynamic FE model is derived and simulated. The numerical results are consistent with the data provided by Experimental Modal Analysis (EMA). Hence, the proposed approach is confirmed viable and will be integrated in the company workflow of future machine designs.

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Material selection in machine design: The change of cast iron for improving the high-quality Iin woodworking

Cited by 27 publications

References 20 publications

Study of the Heat-Treatments Effect on High Strength Ductile Cast Iron Welded Joints

Study of the Heat-Treatments Effect on High Strength Ductile Cast Iron Welded Joints

Variation of Natural Frequencies by Circular Saw Blade Rotation

Structural and Elastodynamic Analysis of Rotary Transfer Machines by Finite Element Model

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