Experimental study on the surface quality of the medical implants obtained by single point incremental forming

Oleksik, Valentin; Pascu, Adrian; Deac, Cristian; Fleacă, Radu; Bologa, Octavian; Racz, Sever-Gabriel

doi:10.1007/s12289-010-0922-x

Cited by 43 publications

(21 citation statements)

References 3 publications

(3 reference statements)

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“…In addition, the surface finish decreases with increased tool diameter. Another investigation proved that the equality of formed part (Ti-6Al-4 V sheet) is influenced by the surface roughness of the tool and the friction between the sheet and tool but not by the tool radius [20]. Rough surface of ISF part could be obtained with low feed rate (1200 mm/min) as compared to that obtained with higher feed rate (8400 mm/min) [21].…”

Section: Introductionmentioning

confidence: 92%

Investigation of the effect of forming parameters in incremental sheet forming using a micromechanics based damage model

Gatea

Lü

et al. 2018

Int J Mater Form

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The incremental sheet forming (ISF) process is considered as a feasible solution for forming a variety of small batch and even customised sheet components. The quality of an ISF product is affected by various process parameters, e.g. sheet material, stepdown, feed rate, tool diameter and lubricant. To produce an ISF part of sufficient quality and accuracy without defects, optimal parameters of the ISF process should be selected. In the present work, experiments and FE analyses were conducted to evaluate the influence of the main ISF process parameters including the step-down, feed rate and tool diameter on the formability and fracture of two types of pure Ti (grade 1 and 2). The Gurson-Tvergaard-Needleman (GTN) damage constitutive model with consideration of stress triaxiality was developed to predict ductile fracture in the ISF process due to void nucleation, growth and coalescence. It was found that the ISF parameters have varying degrees of effect on the formability and fracture occurrence of the two types of pure Ti, and grade 2 pure Ti sheet is more sensitive than grade 1 Ti sheet to the forming parameters due to low ductility.

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Section: Introductionmentioning

confidence: 92%

Investigation of the effect of forming parameters in incremental sheet forming using a micromechanics based damage model

Gatea

Lü

et al. 2018

Int J Mater Form

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“…Also, the acetal tool produced a surface that was more cosmetically consistent with unformed sheet metal than the carbide tool. Experimental research was presented by Oleksik et al [85] to study surface quality of the medical implants used for the partial resurfacing of the femoral condylar surface of the knee. The parts made of titanium (Ti-6Al-4V) were manufactured by SPIF.…”

Section: Tool Size and Materialsmentioning

confidence: 99%

Review on the influence of process parameters in incremental sheet forming

Gatea

McCartney

2016

Int J Adv Manuf Technol

157

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Incremental sheet forming (ISF) is a relatively new flexible forming process. ISF has excellent adaptability to conventional milling machines and requires minimum use of complex tooling, dies and forming press, which makes the process cost-effective and easy to automate for various applications. In the past two decades, extensive research on ISF has resulted in significant advances being made in fundamental understanding and development of new processing and tooling solutions. However, ISF has yet to be fully implemented to mainstream high-value manufacturing industries due to a number of technical challenges, all of which are directly related to ISF process parameters. This paper aims to provide a detailed review of the current state-of-the-art of ISF processes in terms of its technological capabilities and specific limitations with discussions on the ISF process parameters and their effects on ISF processes. Particular attention is given to the ISF process parameters on the formability, deformation and failure mechanics, springback and accuracy and surface roughness. This leads to a number of recommendations that are considered essential for future research effort.

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“…The tool material and the tool surface quality also influence the final manufactured surface quality. In this way, Oleksik et al [33] reduced the tool roughness in order to improve the part surface finish, and there were obtained a comparable roughness of the final part with the initial roughness of the titanium alloy sheet.…”

Section: Surface Roughnessmentioning

confidence: 99%

“…Therefore, springback affects the dimensional accuracy of the finished part. A lot of researchers investigated this topic and they found many solutions to improve the dimensional accuracy of ISF parts: -it is indicated to use a backing plate (Fig.1) to support the sheet flange [4,35]; -using a smaller tool diameter and incremental step depth, the springback can be reduced, as Ambrogio et al [36] and Oleksik et al [33] demonstrated; -Duflou et al [35] concluded that using a multi-pass toolpath strategy leeds to a better accuracy, minimising the sprigback effect. On the other hand Junchao et al [37] find that increasing the number of stages the springback becomes higher using a single stage strategy, because of the springback accumulation during each forming stage;…”

Section: Springback In Isfmentioning

confidence: 99%

Incremental deformation: A literature review

Nasulea

Oancea

2017

MATEC Web Conf.

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Abstract. Nowadays the customer requirements are in permanent changing and according with them the tendencies in the modern industry is to implement flexible manufacturing processes. In the last decades, metal forming gained attention of the researchers and considerable changes has occurred. Because for a small number of parts, the conventional metal forming processes are expensive and time-consuming in terms of designing and manufacturing preparation, the manufacturers and researchers became interested in flexible processes. One of the most investigated flexible processes in metal forming is incremental sheet forming (ISF). ISF is an advanced flexible manufacturing process which allows to manufacture complex 3D products without expensive dedicated tools. In most of the cases it is needed for an ISF process the following: a simple tool, a fixing device for sheet metal blank and a universal CNC machine. Using this process it can be manufactured axis-symmetric parts, usually using a CNC lathe but also complex asymmetrical parts using CNC milling machines, robots or dedicated equipment. This paper aim to present the current status of incremental sheet forming technologies in terms of process parameters and their influences, wall thickness distribution, springback effect, formability, surface quality and the current main research directions.

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Experimental study on the surface quality of the medical implants obtained by single point incremental forming

Cited by 43 publications

References 3 publications

Investigation of the effect of forming parameters in incremental sheet forming using a micromechanics based damage model

Investigation of the effect of forming parameters in incremental sheet forming using a micromechanics based damage model

Review on the influence of process parameters in incremental sheet forming

Incremental deformation: A literature review

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