N. Talib

The performance of modified jatropha-oil based trimethylolpropane(TMP) ester on tribology characteristic for sustainable metalworking fluids (MWFs)

Metalworking fluids (MWFs) are widely used in machining process to improve its performance and product quality. It acts as a coolant and lubricant to reduce heat between the contact of two surfaces. However, commercial MWFs used in the industry were usually from petroleum-based oil which is toxic to the environment, difficult to dispose and caused significant health. Therefore, it is essential to develop a bio-based MWFs to overcome the aforementioned drawbacks. This study was aimed to determine the effect of chemically modified crude jatropha oil (CJO) with trimethylolpropane (TMP) at different molar ratio on tribological characteristic. The produced TMP esters are compared with synthetic ester in terms of wear scar diameter, coefficient of friction and friction torque. From the result, it shows that modified jatropha oil was equivalent with synthetic ester and provided good lubrication and reduce friction and wear.

Tribological evaluation on various formulation of modified rbd palm olein as sustainable metalworking fluids for machining process

Sustainable manufacturing has become popular among manufacturers and industrialists due to the increase in environmental issues, health impacts and stringent law enforcement. The use of vegetable oils as metalworking fluids is one way to implement manufacturing sustainability. Palm oils are commonly used as cooking oils. Further, palm oil is also the main oil sources in Southeast Asia besides petroleum. Therefore, the potential use of palm oil as functional lubricant for future replacement of petroleum-based oil is indeed important. In this study, the refined, bleached and deodorized (RBD) palm olein has been formulated into various properties of modified RBD palm oil (MRPO) by transesterification process at different molar ratio of RBD methyl ester (FAME) with trimethylolpropane (TMP). Next, the MRPOs are compared with synthetic ester on lubrication and tribology tests according to standard based on American Society for Testing and Materials (ASTM). The results observed that MRPO have outstanding performance in lubrication and tribological behavior. MRPO2 recorded the highest viscosity index and the lowest coefficient of friction which are 496 and 0.06, respectively. MRPO2 showed to be an alternative biodegradable cutting fluid in promoting sustainable manufacturing activities by reducing the bad impact on environment and health.

Effect of pouring temperature on microstructure properties of Al-Si LM6 Alloy sand casting

In the present paper an experimental investigation on green sand casting of Al-Si cast alloy (LM6) has been conducted. The main objectives of the research were the effect of pouring temperature on microstructure property of green sand casting Al-Si LM6 Alloy. The high quality of The LM6 alloy was investigated by controlling the pouring temperature. The pattern was flat like and pouring was done with four different temperatures 630, 660, 690 and 720Cº. The obtained results showed that the pouring temperature has a significant influence on the quality of green sand casting of LM6 Al-Si alloy. The lower pouring temperature provides finer microstructure with fewer defects such as porosity.