Effect of die shape on the metal flow pattern during direct extrusion process

Solomon, Nicolae; Solomon, I. John

doi:10.3989/revmetalm.0928

Cited by 14 publications

(7 citation statements)

References 14 publications

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“…It was seen that the opening angle of the die influences the residual stresses: smaller opening angles lead to a more uniform velocity field in the cross section of the extruded material, decreasing the final residual stresses [39]. In this case, it is not possible to change the orientation of the stress state significantly, but the tensile residual stresses on the surface of the workpiece can be reduced [38]. The same phenomenon was observed for radial cold forging [59], where an optimization of the residual stresses is achieved with a decrease in the inlet angle.…”

Section: Tools Optimisationmentioning

confidence: 99%

Strategies for residual stress adjustment in bulk metal forming

et al. 2021

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The family of bulk forming technologies comprises processes characterised by a complex three-dimensional stress and strain state. Besides shape and material properties, also residual stresses are modified during a bulk metal forming process. The state of residual stresses affects important properties, like fatigue behaviour and corrosion resistance. An adjustment of the residual stresses is possible through subsequent process steps such as heat treatments or mechanical surface modification technologies, like shot peening and deep rolling. However, these additional manufacturing steps involve supplementary costs, longer manufacturing times and harmful effects on the product quality. Therefore, an optimized strategy consists in a targeted introduction of residual stresses during the forming processes. To enable this approach, a fundamental understanding of the underlying mechanisms of residual stress generation in dependence of the forming parameters is necessary. The current state of the art is reviewed in this paper. Strategies for the manipulation of the residual stresses in different bulk forming processes are classified according to the underlying principles of process modification.

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Section: Tools Optimisationmentioning

confidence: 99%

Strategies for residual stress adjustment in bulk metal forming

et al. 2021

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“…The higher the ctional force, the bigger the distortion. According to Solomon and Solomon [43], for a cylinder shape extrusion, the most deformed metal layer after the extrusion are the layers located between the outer surface and the half of the radius.…”

Section: Metal Ow Observationmentioning

confidence: 99%

A new approach for cold extrusion process: Dimples indentation on sliding contact surface and palm oil as an alternative lubricant

Nurul

Samion

2017

Scientia Iranica

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Surface texturing is one of the economic solutions to die modi cation if compared with tool change and hot works. In extrusion die design, it has become increasingly common to add dimples to maintain lubricant ow along the metal forming process. For that reason, this research was done by embedding dimples in a tapered die sliding contact surface to explore its e ectiveness in a nished product of cold extrusion process. Besides, an alternative lubricant from palm oil was also tested, and mineral oil was used for comparison purposes. As a result, dimpled tapered die may help decrease the extrusion load of cold extrusion process, leading to ner surface roughness of extruded product. Palm oil-based lubricant also presents similar results to those of mineral oil, meaning that palm oil has a potential to be considered as a new metal forming lubricant in the future.

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“…The higher the fictional force, the bigger the distortion. According to Solomon and Solomon (2010), for a cylinder shape extrusion, the most deformed metal layer after the extrusion is the layer located between the outer surface and the half of the radius.…”

Section: Metal Flow Patternmentioning

confidence: 99%

Alternative Lubricants: Study on Palm Oil-Based Lubricants in Metal Forming Process

Nurul

Syahrullail²,

Teng

2016

JOPR

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Mineral oil-based lubricants are always the preferred choice for industrial application due to their excellent properties and reasonable price. However, due to environmental and depletion issues, a number of studies have been carried out to explore alternative lubricants such as plant oils. In metal forming processes, reducing frictions, improving tool life and product quality are some of the important issues to be considered. In our study, palm oil-based lubricants were tested for cold extrusion processes and mineral oils were used for comparison purposes. It was found that refined bleached deodorised (RBD) palm kernel oil and palm olein performed an enhanced extrusion load than mineral oil-based lubricant, and they showed no severe wear on product surface. Based on the results, renewable oil-based lubricants can be considered as a substitute to common mineral oil based lubricants used in the industry.

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Effect of die shape on the metal flow pattern during direct extrusion process

Cited by 14 publications

References 14 publications

Strategies for residual stress adjustment in bulk metal forming

Strategies for residual stress adjustment in bulk metal forming

A new approach for cold extrusion process: Dimples indentation on sliding contact surface and palm oil as an alternative lubricant

Alternative Lubricants: Study on Palm Oil-Based Lubricants in Metal Forming Process

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