بایگانی برچسب برای: Manufacturing

Support of engineering changes in manufacturing systems[taliem.ir]

Support of engineering changes in manufacturing systems by production planning and control methods

Due to changing customer demand and development of new technologies, manufacturing companies have to implement engineering changes in manufacturing systems. Planning and control of these engineering changes is a key task for the company because of the involved costs and time exposure. To improve the organization of several engineering changes in manufacturing systems, methods of production planning and control are evaluated which can support the planning and control of engineering changes. The purpose of the paper is to introduce existing methods for production planning and control in the planning and control of engineering changes in manufacturing systems. In the first step, the tasks of production planning and control and tasks for the implementation of engineering changes are listed. The handling of several parallel engineering changes is of particular importance. The tasks required for pre-selection, detailed planning and control of engineering changes are analyzed. In the second step, these tasks are compared with tasks from the production planning and control on similarities. Furthermore, methods to support these tasks will be considered. In the third step, methods are exemplarily investigated to requirements and usability for the implementation of engineering changes. With the Support of engineering changes in manufacturing systems by production planning and control method, proven existing methods can enhance the engineering changes. Knowledge about relationships in manufacturing systems can be transferred from production planning and control and optimize the implementation of engineering changes.
Corrosion resistance of sintered[taliem.ir]

Corrosion resistance of sintered duplex stainless steel evaluated by electrochemical method

Purpose: of this paper was to examine the corrosion resistance of duplex stainless steels using electrochemical methods in 1M NaCl solution. The influence of powder mixes preparation and cooling cycle after sintering on corrosion properties was evaluated. Design/methodology/approach: In presented study duplex stainless steels were obtained through powder metallurgy starting from austenitic, martensitic base powders by controlled addition of alloying elements, such as Cr, Ni, Mo and Cu. In the studies behind the preparation of mixes, Schaeffler’s diagram was taken into consideration. Prepared mixes have been compacted at 800 MPa and sintered in a vacuum furnace with argon backfilling at 1260°C for 1 h. After sintering two different cooling cycles were applied: rapid cooling with an average cooling rate of 245 °C/min and slow cooling of 5 °C/min in argon atmosphere. Produced duplex stainless steels have been studied by scanning and optical microscopy and EDS chemical analysis of microstructure components. Corrosion properties have been studied through electrochemical methods in 1M NaCl water solution Findings: According to achieved results, it was affirmed that applied sintering method as well as powder mixes preparation allows for manufacturing the sintered duplex steels with good corrosion properties which depends on austenite/ferrite ratio in the microstructure and elements partitioning between phases. Corrosion resistance of sintered stainless steels is strictly connected with the density and the pore morphology present in the microstructure too. The highest resistance to pitting corrosion in 1M NaCl solution was achieved for composition with approximate balance of ferrite and austenite in the microstructure. Research limitations/implications: According to the powders characteristic, the applied fast cooling rate seems to be a good compromise for corrosion properties and microstructures, nevertheless further tests should be carried out in order to examine different cooling rates
Environmental management accounting practices in small medium[taliem.ir]

Environmental management accounting practices in small medium manufacturing firms

This study investigates factors and barriers which influence the practice of environmental management accounting (hereafter known as EMA)
Working Capital Management and Profitability of Firms A[taliem.ir]

Working Capital Management and Profitability of Firms: A Study of Listed Manufacturing Firms in Ghana

The efficient management of working capital is crucial to the profitability of firms therefore, it is prudent that management of firms make available in the right amount, resources to manage working capital. The main objective of the study was to establish a statistical relationship between profitability measured by the return on assets and the elements of working capital such as the cash conversion cycle (CCC), average collection period (ACP), average payment period (APP) and inventory turnover days (IT). Growth, size and leverage were control variables identified. A sample size of four (4) companies listed on the Ghana Stock Exchange (GSE) out of a population of five (5) listed trading companies for the 2006 to 2010 financial years. The results showed a fairly negative significant relationship between the cash conversion cycle, average collection period and average payment period implying that a reduction in the periods for receiving cash, an increase in the period for paying cash a reduction in the cash conversion cycle will cause an increase in profit. The inventory turnover days as well as all other control variables showed a positive relationship with profitability. Hence, study recommends that trading companies should manage their working capital more efficiently so as to keep it in equilibrium