Optimization of process parameter for surface finishing in abrasive flow finishing process
274 Optimization of process parameter for surface finishing in abrasive flow finishing process Ravi Gupta (M.E) Asst. Prof.(Lovely Professional University) raviarya43@gmail.com , Abstract-Abrasive flow finishing is a non-conventional finishing process that is used for finishing of work piece which are difficult to finish by conventional method i.e. by honing, lapping and other machining operations. It is used for polishing, deburring, removing recast layer of component and for cleaning of surfaces having complex shape and size of geometrical components. Abrasive flow finishing process polishes the surface by forcing the abrasive medium inside the work piece through the restricted area. One of the limitations of this process is that it is time consuming process and low material removal rate. To overcome these limitations, a structure has been developed. In this setup, centrifugal force has been generated by using a tool rod inside the hollow work piece to which rpm was provided. The abrasive mesh size, abrasive concentration, number of cycle, extrusion pressure, rotational speed of CFG rod, diameter of tool rod and shape of tool rod are the some important process parameter which affects the surface quality. In this research paper, the role of abrasive mesh size, extrusion pressure, abrasive concentration and rotational speed has been discussed on Gun metal as material of work piece. For experimentation design, taguchi approach L9 orthogonal array has been used and for analysis of result, ANOVA has been performed. KeywordsAFF, Surface roughness, rotational speed Taguchi method, ANOVA
EXPERIMENTAL INVESTIGATION OF PROCESS PARAMETERS ON SURFACE ROUGHNESS IN HYBRID ABRASIVE FLOW MACHINING PROCESS (AFM)
Abrasive flow machining (AFM) is a non-traditional machining process which is used to deburr, polish and radius surfaces & edge by flowing an abrasive medium inside the workpiece surface to be machined. To make the process efficient, hybrid machining process has been employed by providing a centrifugal force generating rod with rotational mechanism in AFM setup. These centrifugal forces assist the media to rotate continuously as it moves axially inside the cylindrical workpiece. In this experimental study parameters such as abrasive grit size, abrasive concentration, rotational speed of rod and diameter of rod were varied to observe their effects on surface finish. The results reports that all the process parameters have remarkable effect on response parameter. L9 orthogonal array based on taguchi method has been employed for experimental design without considering any interaction.
Phase formation during mechanical alloying in the Ti–Si system
Abstract Mechanical alloying of Ti–Si powder mixture or TiH 1.924 –Si powder mixture was performed by high-energy ball milling, in which the Ti to Si mole ratio was 1:2. The phase formations in both mixtures during milling were investigated by X-ray diffraction. Mechanical alloying a mixture of elemental powders led to the formation of TiSi 2 equilibrium compound, while when starting from Si + TiH 1.924 , a metastable phase was formed. The metastable phase completely transforms to TiSi 2 when the mechanically alloyed powder is annealed at temperatures above 800 °C. Two different pathways of phase transitions during mechanical alloying are attributed to the existence of hydrogen atoms, i.e., when starting from Si + TiH 1.924 compared to Si + Ti, the kinetics for the formation of the TiSi 2 intermetallic compound slows down. The kinetics related to the different phase transitions depending on the starting powder mixture are discussed.