Papers by Author: Yusof Daud

Abstract: The current study is presented into the investigation of the application of ultrasonic vibration on the lower punch during compaction process of powder metallurgy material. The lower punch is specifically designed of ultrasonic horn which has been tuned at frequency of 20 kHz and vibrates in longitudinal mode. Finite Element modeling was used to assist the design process of the lower punch or horn. The horn was fabricated using high grade aluminium alloy and mounted onto the ultrasonic system test rig and subsequently tested prior the experimental process begins. Various static and ultrasonic compaction procedures have been carried out to confirm the capability of the tool to operate. The compaction force was reduced significantly at the onset of ultrasonic vibration applied compared to without ultrasonic.

Abstract: Enterprise Resource Planning (ERP) system is integrated software that linked the functional areas in the organization by using and sharing the database in one platform. The implementation of ERP system in most of the manufacturing plants help in simplifying the production and scheduling system and smoothing the process flow which will lead the organisation towards lean manufacturing environment. Most of the manufacturers do not analyse and review on the effectiveness and implications of the ERP system at the post implementation stage. This study was established to address the impacts of the ERP system in leveraging the lean practices at the shop floor and the recommendations for the continuous improvement initiatives. Data for analysis has been retrieved from in house ERP system and from manual record system of a company that already implemented ERP system. Questionnaires have been distributed to ERP users within Malaysia and Singapore to gain insight the related issue of using ERP system in their company. The study provides evidence on the effectiveness and positive impacts of the ERP system to support manufacturing industries to become more lean and agile. ERP system also effectively to response to the customer requirement and added the value along the supply chain.

Abstract: Finite element (FE) model of die necking process of an aluminium hollow thin cylinder has been developed. The input parameters of material properties and coefficient of friction, µ for the model have been deducted from our previous experimental study. Later the models have been validated against experimental data as reported in the previous studies. For the die necking process, the FE model has successfully to predict how much the original diameter of the aluminium hollow cylinder can be maximised necked with and without applying ultrasonic vibration. FE models showed that the application of ultrasonic vibration during the necking process has reduced buckling of the cylinder body if compared to the necking process without ultrasonic. The benefit of applying ultrasonic vibration in sheet metal forming process has been related to the reduction of interface friction between die and specimen.