This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “LBM-Material Removal”. Material removal takes place in AJM due to _____ a) electrochemical action b) mechanical impact c) fatigue failure of the material d) sparking on impact View Answer. Answer: b Explanation: In Abrasive Jet Machining (AJM), abrasive particles are made to impinge on the work material at a high velocity. The major characteristics of Non-conventional machining are: 1. Modelling has been done with the following assumptions: (i) Abrasives are spherical in shape and rigid. The particles are … For example in AJM, chips are of microscopic size and in case of Electrochemical machining material removal occurs due to electrochemical dissolution at atomic … Knowledge of material removal rate (MRR) is beneficial for selecting process parameters and choosing … When an abrasive particle impinges on the work surface at a high velocity, the impact causes a tiny brittle fracture and the following air carries away the dislodged small work-piece. A jet of inert gas consisting of very fine abrasive particles strikes the work piece at high velocity resulting in material removal through erosive action. For example in AJM, chips are of microscopic size and in case of Electrochemical machining material removal occurs due to electrochemical dissolution at atomic level. This method of metal removal … AJM is a metal removing process and it is invented in 1967. What is the material removal mechanism of Laser beam machining process? The important machining characteristics in AJM are The material removal rate (MRR) mm3/min or gm/min The machining accuracy The life of the nozzle Modelling of material removal As mentioned earlier, material removal in AJM takes place due to brittle fracture of the work material due to impact of high velocity abrasive … An impingement angle (θ) between 70º – 80º provides better result in terms of material removal rate in abrasive jet machining. Material removal may occur with chip formation or even no chip formation may take place. I The abrasive particles are typically of 0.025mm diameter and the air discharges at a pressure of several atmosphere. The high velocity … (vii) Modelling of material removal As mentioned earlier, material removal in AJM takes place due to brittle fracture of the work material due to impact of high velocity abrasive particles. Abrasive Jet Machining Modelling of material removal Material removal in AJM takes place due to brittle fracture of the work material due to impact of high velocity abrasive particles. Abrasive Jet Machining (AJM) I In AJM, the material removal takes place due to impingement of the ne abrasive particles. The particles are characterised by the Here, the material removal takes place due to the impingement of the fine abrasive particles. a) Melt and evaporate b) Electro chemical corrosion c) Mechanical erosion of materials d) Electro chemical … Material removal may occur with chip formation or even no chip formation may take place. Material removal rate and its estimation. This erosive action has been employed for cutting, cleaning, etching, polishing and debarring. • Material removal takes place due to application of cutting forces • Cutting tool is harder than work piece at room temperature as well as under machining conditions Demerits of conventional machining processes: In conventional machining, metal is removed by chip formation which is an expensive and difficult process Effects of impingement angle on AJM performance. INTRODUCTION. 1. Modelling has been done with the following assumptions: (i) Abrasives are spherical in shape and rigid.

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