Minimum lubrication in Al-Si drilling

Braga, Durval Uchôas; Diniz, Anselmo Eduardo; Miranda, Gilberto Walter Arenas; Coppini, Nivaldo Lemos

doi:10.1590/s1678-58782003000100009

Cited by 10 publications

(4 citation statements)

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“…Three levels of flow rate and air pressure were used: 20, 40, and 60 ml/h and 1, 2, and 3 bars. The choice of those levels was based on previous studies on MQL drilling of aluminum alloys which applied flow rates in the range of 10 to 100 ml/h and in some cases up to 250 ml/h [8,9,[59][60][61][62][63][64][65][66][67][68].…”

Section: Mql Drilling Trials Setupmentioning

confidence: 99%

The effect of drilling parameters, cooling technology, and fiber orientation on hole perpendicularity error in fiber metal laminates

Giasin

2018

Int J Adv Manuf Technol

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Conventional twist drilling is a widely used machining process for creating holes in aerospace and automobile structures. Drilling at room temperature can sometime affect the quality of machined holes due to increased thermal effects on the workpiece. Thermal effects can be a cumbersome when machining composites and fiber metal laminates due to their different thermal expansion coefficients, which may introduce additional stress in the structure. Thermal machining effects can be minimized using coolants supplied either directly or indirectly to the cutting tool-workpiece interaction zone, to remove away part of the generated heat. The use of coolants adds extra costs for handling, disposal, and environmental impact. Therefore, environmentally friendly cooling technologies are replacing conventional cooling methods to reduce costs and impact on the environment. In addition, the selection of machining parameters has great influence on the hole quality. This paper investigates the impact of drilling parameters and two modern cooling technologies namely cryogenic liquid nitrogen and minimum quantity lubrication on the hole perpendicularity error of fiber metal laminates commercially known as GLARE® (Glass Laminate Aluminum Reinforced Epoxy). It was also found that applying cryogenic liquid nitrogen or minimum quantity lubrication does not lead to an improvement in hole perpendicularity error in GLARE® laminates.

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Section: Mql Drilling Trials Setupmentioning

confidence: 99%

The effect of drilling parameters, cooling technology, and fiber orientation on hole perpendicularity error in fiber metal laminates

Giasin

2018

Int J Adv Manuf Technol

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“…Thus, because the effect of MQL on the process is mainly lubrication and it presents a very small cooling ability to the tool (Braga et al, 2003), it will not cause thermal cracks generation and J. of the Braz. Soc.…”

Section: Results Of the Third Phase -Experiments With Minimum Quantitmentioning

confidence: 99%

Toroidal milling of hardened SAE H13 steel

Diniz¹,

Ferreira²,

Silveira³

2004

J. Braz. Soc. Mech. Sci. & Eng.

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It is estimated that around 65% of the cost of a die or mould is related to the machining processes. Moreover, the literature says that 70% of the time spent in the machining processes of this kind of parts is used in finishing and semi-finishing operations. The high complexity of the machined surfaces makes mandatory the use of ball nose tools, with large overhang, what increases vibration in the process. These problems have to be minimized, since dies and moulds demand a very good surface finish and tight dimensional tolerances. A frequently used strategy to attenuate these problems is to carry out semi-finishing operations with cutters containing circular inserts, because these inserts produce smooth transitions among the passes and a smaller and more uniform stock material for the finishing operation. The main goal of this work is to evaluate the performance of rounded inserts of carbide and cermet in the semi-finishing milling (called toroidal milling) of H13 steel with hardness of 50 HRc. The influence of radial depth of cut, cutting speed and feed per tooth on tool life will also be considered. It also intends to test the feasibility of using minimum quantity of lubricant (MQL) technique instead of dry cutting in this kind of machining operation

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“…al. [12] used this technique on drilling Aluminum-Silicon alloy (323) with carbide drills, without coating. The authors concluded that MQL could reduce the temperature on the chip formation zone, maintaining it at levels low enough to avoid tool material deterioration.…”

Section: Introductionmentioning

confidence: 99%

Temperature and Heat Flow When Tapping of the Hardened Steel Using Different Cooling Systems

Brandão

Coelho

2009

Ingeniare. Rev. chil. ing.

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Trabajar los aceros endurecidos siempre ha sido un desafío para el corte de metales, particularmente en las operaciones de roscado. En el presente trabajo se mide la temperatura del acero AISI H13 endurecido, realizándose ensayos sin lubricación (seco) y dos sistemas con lubricación: aceite lubricante en grandes cantidades y mínima cantidad de líquido (minimum quantity of fluid MQF) a 20 ml/h, en ambos casos se utilizó aceite integral mineral. El roscado se realiza sobre probetas de prueba de 100 x 40 mm con 14 mm de espesor y dureza de 55 HRc. Para medir la temperatura se utiliza la técnica de termocuplas situadas muy próximas al diámetro mayor del hilo de rosca (a 0.1, 2.5 y 5 mm de distancia). Se utilizan tres termocuplas a lo largo del espesor de la probeta de prueba a 3.0, 7.0 y 11.0 mm desde la entrada del roscado. Se hacen dos réplicas del registro de la temperatura para cada condición de corte ensayada. Se utiliza un modelo teórico-analítico de conducción de calor para evaluar la temperatura en la interfase de la probeta de prueba, determinar el flujo de calor y el coeficiente de convección. El menor incremento de la temperatura y del calor se observa al utilizar el método lubricante en grandes cantidades, seguido por el de MQF, al comparar con la condición en seco. El efecto es directamente proporcional a la cantidad de lubricante aplicado, siendo también significativo con el sistema MQF al compararlo con el corte en seco. Palabras clave: Roscado, conducción del calor, cantidad mínima del líquido (MQL), acero AISI H13, temperatura.

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Minimum lubrication in Al-Si drilling

Cited by 10 publications

References 0 publications

The effect of drilling parameters, cooling technology, and fiber orientation on hole perpendicularity error in fiber metal laminates

The effect of drilling parameters, cooling technology, and fiber orientation on hole perpendicularity error in fiber metal laminates

Toroidal milling of hardened SAE H13 steel

Temperature and Heat Flow When Tapping of the Hardened Steel Using Different Cooling Systems

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