A Study of Influence of Electrolyte Composition on ECH of Bevel Gears using Mixture D-Optimal Design
This paper discusses the experimental investigation to find out the optimal electrolyte composition in improving the surface quality of the gear teeth profile during surfacing finishing of bevel gears by the electrochemical honing process. In this study, AISI 1040 was used as the workpiece material, mixtures of sodium chloride and sodium nitrate in different ratios were used as the input parameter, and the percentage improvement in the surface roughness and material removal rate of the process were used as measures of process performance. The experimental runs were designed according to the Mixture DOptimal design. The analysis of the experimental outcome was carried out and 80% NaCl + 20% NaNO3 was found to be theoptimal electrolyte composition to conduct the confirmation experiments. The finding of the study establishes the process for precision finishing of bevel gears.
Electro Chemical Honing (ECH) of External Cylindrical Surfaces of Titanium Alloys
Abstract Surface roughness has become the most significant functional requirement and it is an index of the product quality. In order to increase the efficiency of hard to machine alloys like titanium and nickel alloys, an Electro Chemical Honing (ECH) process has been employed to achieve highest material removal rate with the best surface qualities. This extended abstract describes the design and fabrication of an indigenously developed tooling setup for ECH of external cylindrical surfaces of Titanium alloys (TI 6AL 4 V) and also highlights the key process parameters and their affect on ECH process. The influence of the machining parameters on the surface finish has been investigated and optimized the process parameters for improving the surface roughness is also evaluated. Percentage improvements in surface roughness values Ra and other parameters like electrolyte temperature, composition and concentration were studied while changing the processing time (PT). And also the study of surface characteristics of micro and macro level and micro hardness too examined.
Continuity, Legitimacy, and Agricultural Development: Conclusions
This chapter aims at bringing together the principal conclusions of the volume, emphasising some particular aspects and questions. Policy continuity in relation to the late 1980s was rightly defined by the Aylwin government policymakers as an essential instrument for further agricultural growth. But in a democratic environment the Aylwin policies, in part precisely because of their strong element of continuity, could be implemented only if they were perceived as legitimate by the majority of the rural population, and by the poor in particular. This means that substantial improvements in agricultural income distribution, and in the quantity and quality of the social services provided to the rural poor, were unavoidable. In order to achieve legitimacy it was, and is, necessary to introduce changes. A lucid, creative combination of continuity and change was the only guarantee of success for the Aylwin policies, and for those of future democratic administrations. Continuity and legitimacy are the fundamental pillars for democratic agricultural development.