Evaluation of contact conditions in hot forging of pure aluminum using ultrasonic examination

Saiki, Hiroshi; Zhan, Zhi Hong; Marumo, Yasuo; Ruan, Liqun; Morooka, Toshiharu; Tatsuda, Shin Ichi

doi:10.1016/j.jmatprotec.2006.04.020

Cited by 7 publications

(3 citation statements)

References 9 publications

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“…The schematic of the experimental setup is in Fig. 26 [89]. In the experiment, the workpiece was mounted in the lower die, which was heated up to 300 °C .…”

Section: Friction 3(1): 1-27 (2015)mentioning

confidence: 99%

Tribology in metal forming at elevated temperatures

et al. 2015

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Abstract:The tribo-characteristics of metal forming at high temperatures have not yet been well understood due to the complex nature of thermal, microstructural, interaction, and process parameters. This is a review paper on the effects of temperature, coating, and lubrication to the tribological characteristics in hot forming as well as the tribometers for different metal forming processes at elevated temperatures mainly based on the experimental work. The tribological behaviors of oxides in hot forming, such as rolling and stamping, were reviewed and presented. Some commonly used surface coatings and lubricants in hot forming were given. Many types of tribometer were selected and presented and some of them provided a great potential to characterize friction and wear at elevated temperatures. Nevertheless, more testing conditions should be further investigated by developing new tribometers. Eventually, experimental results obtained from reliable tribometers could be used in theory and model developments for different forming processes and materials at high temperatures. The review also showed the great potential in further investigations and innovation in tribology.

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“…The schematic of the experimental setup is in Fig. 26 [89]. In the experiment, the workpiece was mounted in the lower die, which was heated up to 300 °C .…”

Section: Friction 3(1): 1-27 (2015)mentioning

confidence: 99%

Tribology in metal forming at elevated temperatures

et al. 2015

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“…During the forging process, friction is important factor and a lower friction status is desired. (Saiki et al,2006) utilized oil in hot and cold deformation and measured the thickness by using the ultrasonic reflection method. (Wilson et al, 2004) Surface roughness and lubrication that affect friction coefficient are extremely important in forging and they are considered to be a considerable problem in the process i.e.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Hip Prosthesis Production With Forging Using the Finite Element Method

2015

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Hip prostheses used to fulfill injured or fractured limbs are made by machining, casting and plastic forming. Machining is the most commonly used one. However, there are many disadvantages such as high product cost in machining. Plastic forming methods provide more effective and durable implant production than machining. In this study, hip prosthesis with a complex geometry produced by forging were analyzed using the Finite Element Method (FEM). For this purpose, three-dimensional complex geometry was designed and then, FEM analyses were performed using MSC SIMUFACT 10 software. Factors affecting the production were defined as: temperature, friction coefficient and the pressing velocity. Stress distributions, temperature changes, die wears and punch forces applied to the die were examined. As a result of the study, the most suitable parameters were obtained as 500°C, 0.05 coefficient of friction and 2mm/s die velocity. Also, the obtained FEM results were examined by regression analyses.

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“…Hot forging of sintered aluminum preforms can also impart significant mechanical gains in terms of properties [25]. In isothermal upset forging of pure aluminum, the change in the contact condition and the lubricant behavior were evaluated by continuously measuring the ultrasonic reflection intensity from the contact interface between the tool (die) and workpiece [26]. Forging behavior of 2124 aluminum alloy containing 26 vol.% of SiC particles was investigated at room and elevated temperature tensile tests.…”

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confidence: 99%

Hot Upset Studies on Sintered (Al–TiO2–Gr) Powder Metallurgy Hybrid Composite

Ravichandran¹,

Anandakrishnan

2016

Strength Mater

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à ×åíäóðàíñêèé èíaeåíåðíî-òåõíîëîãè÷åñêèé êîëëåäae, Ïóäóêêîòòàé, Òàìèëíàä, Èíäèÿ á Íàöèîíàëüíûé òåõíîëîãè÷åñêèé èíñòèòóò, Òèðó÷÷èðàïïàëëè, Òàìèëíàä, Èíäèÿ Àëþìèíèåâûå ãèáðèäíûå êîìïîçèòû Al+5%TiO 2 , Al+5%TiO 2 +2%Gr è Al+5%TiO 2 +4%Gr èç èçìåëü÷åííûõ íà ãðàíóëÿòîðå ïîðîøêîâ ñèíòåçèðîâàíû ìåòîäîì ïîðîøêîâîé ìåòàëëóðãèè. Èññëåäîâàíèÿ ìåòîäàìè ñêàíèðóþùåé ýëåêòðîííîé ìèêðîñêîïèè è ýíåðãîäèñïåðñèîííîé ðåíòãåíîâñêîé ñïåêòðîñêîïèè ïîêàçàëè, ÷òî óïðî÷íÿþùèå äîáàâêè ïî îáúåìó îáðàçöîâ ðàñïðåäåëÿþòñÿ ðàâíîìåðíî. Èñïûòàíèÿ íà ãîðÿ÷óþ îñàäêó îáðàçöîâ, íàãðåòûõ äî 450°C, ïðîâåäåíû ñ ïîäðîáíûì èçó÷åíèåì õàðàêòåðèñòèê óïëîòíåíèÿ è äåôîðìèðîâàíèÿ ïóòåì êîððåëÿöèè èñòèííîãî îñåâîãî íàïðÿaeåíèÿ ñ èñòèííîé îñåâîé äåôîðìàöèåé, ïðîäîëüíîé äåôîðìàöèåé è òåîðåòè÷åñêîé ïëîòíîñòüþ. Ïîêàçàíî, ÷òî ãåíåðèðóåìûå â ïðîöåññå ãîðÿ÷åé îñàäêè íàïðÿaeåíèÿ óâåëè÷èâàþòñÿ ïðè äîáàâêå ãðàôèòà â êîìïîçèò Al-TiO 2 è äèîêñèäà òèòàíà â Al áåç óïðî÷íÿþùèõ äîáàâîê. Âûïîëíåí àíàëèç ìèêðîñòðóêòóðû îáðàçöîâ ïîñëå ãîðÿ÷åé îñàäêè.Êëþ÷åâûå ñëîâà: êîìïîçèòû ñ ìåòàëëè÷åñêîé ìàòðèöåé, ãîðÿ÷àÿ îñàäêà, íàïðÿaeåíèå, ïîðîøêîâàÿ ìåòàëëóðãèÿ.Introduction. Metal matrix composites (MMC) are under attention for many applications in aerospace, defense and automotive industries. Among MMCs, aluminum metal matrix composites are being considered as a group of new advanced materials for its light weight, high strength, low thermal expansion coefficient and good wear resistance [1]. In contrast, Al does not have enough tensile strength for many applications. Because of this weakness, ceramic particles (e.g., zircon) can be added for better hardness and tolerating high temperatures. Also, they can improve mechanical and tribological properties of the composite [2]. Recently, ceramics particulate reinforced metal matrix composites have been developed with promising results by several laboratories and companies. Despite the advantages listed above, particulate composites have not yet found a wide employment in the commercial applications because the hard particles embedded inside the matrix cause very serious problems in machining [3]. To avoid machining problems in composites,

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Evaluation of contact conditions in hot forging of pure aluminum using ultrasonic examination

Cited by 7 publications

References 9 publications

Tribology in metal forming at elevated temperatures

Tribology in metal forming at elevated temperatures

Analysis of Hip Prosthesis Production With Forging Using the Finite Element Method

Hot Upset Studies on Sintered (Al–TiO2–Gr) Powder Metallurgy Hybrid Composite

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