1. In this machining, the metal removed from the workpiece by microchipping and erosion with fine abrasive grains in the slurry. Aptitude Data Interpretation Verbal Reasoning Non Verbal Reasoning Verbal Ability Programming General Knowledge Puzzle. 4. The material is removed in the same manner as we have discussed above in the working principle. USM offers a solution to the expanding need for machining brittle materials such as … Ultrasonic Machining (USM) Working Principles. In this process the material of the workpiece is removed by the repetitive impact actions of abrasive particles. Both abrasive jet machining (AJM) and ultrasonic machining (USM) are mechanical energy based processes where material is removed by impact erosion. Material abrasion by direct hammering of the abrasive particles against the work piece surface. Material removal in USM is due to: i) Hammering of the abrasive particles on the work surface by the tool. In USM machining, material is removed by _____. It was found there are two types of material removal modes, brittle and ductile, existing in micro USM of silicon. In an ultrasonic machining (USM) process, the material removal rate (MRR) is plotted as a function of the feed force of the USM tool. c. fracture of work material due to impact of grains d. none of the above Answer Explanation Material removal occurs by shear The tool travels vertically or orthogonal to the surface of the part at amplitudes of 0.05 to 0.125 mm (0.002 to 0.005 in. Ultrasonic Machining (USM) also called as ultrasonic vibration machining is a machining process in which material is removed from the surface of a part by low amplitude and high frequency vibration of a tool against surface of material in the presence of abrasive particles. This Monday, Dec. 21, 2020 photo provided by the Office of the Governor of Virginia shows a statue of Confederate Gen. Robert E. Lee being removed from the National Statuary Hall Collection in Washington. • In abrasive jet machining (AJM), hard abrasive particles are mixed with highly pressurized gas at a pre-defined mixing ratio and the mixture is then allowed to come out via a nozzle in a form a narrow jet. Rotary USM: a rotating diamond coated tool is used for drilling and threading, but with no abrasive involved. • Quantitative characterization of cracks & shocking force via fracture mechanics. Factors affecting USM … The major USM process variables effecting material removal rate, accuracy, and surface finish are tool/horn design, power, amplitude, abrasive size and frequency. Electrochemical Machining (ECM) Ultrasonic Machining (USM) Electron Beam Machining (EBM) Laser Beam Machining (LBM) and Electric Discharge Machining (EDM) (a) USM, LBM, EBM, EDM, ECM (b) EBM, LBM, USM, ECM, EDM (c) LBM, EBM, USM, ECM, … Higher viscosity mediums decrease material removal rates. • Expression predicts MRR can be controlled by parameters making process reproducible. ii) Impact of free abrasive particles on work surface. 2. ... 11.Increasing volume concentration of abrasive in slurry (in USM process) would affect MRR in the following manner. These are described as: 1. 1.PROCESS PRINCIPLES •Ultrasonic Machining (USM) is a mechanical material removal process used to erode holes and cavities in hard or brittle workpieces by using shaped tools, high frequency mechanical motion, and an abrasive slurry. • Material removal is due to micro-brittle fracture on the surface of the workpiece. Since the major and vital material removal mechanism is the hammering action or direct indentation by the larger abrasives, many researchers , , , , , , , conducted fundamental research on the mechanical indentation technique by impacting small micro-level either sharp or round indenters on the surface of hard–brittle materials, as to simulate the real USM removal mechanisms. 2. Material Removal Rate (MRR) Relative machinability ratings for some materials 13. 1 Answer to In Ultrasonic Machining (USM) the material removal rate would (a) increase (b) decrease (c) increase and then decrease (d) decrease and then increase With increasing mean grain diameter of the abrasive material. Discussion; Pankaj Chaugule -Posted on 19 Nov 15 - In Ultrasonic Machining (USM) process the material is removed due to the action of abrasive grains. Figure 1 USM material Mechanism From all these models, four different mechanisms can be identified, which are responsible for removal of material from the work surface (Figure1). The removal of material starts. The amplitude of the tool motion affects the material removal rate and obtains the maximum size of the abrasive particles which can be used. The Aquila Digital Community ... damaged, these structures must be repaired to reduce the “remove and replace” costs of It is a mechanical nontraditional machining process by which workpiece material is removed and an exact shape is imparted to the workpiece surface via the cutting action of an abrasive slurry that is driven by tool vibrating at high frequency in line with its longitudinal axis. Tool material: The tool wear must be The reasons for material removal in an USM process are believed to be: 1. ). 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