11. Abrasive Jet Machining is a material removal process with the help of concentrated abrasive grains enclosed in a nozzle that removes by the action of impact erosion. This stream is directed on the work surface by using a suitable nozzle. The nozzle is made of either circular or rectangular cross-section and the head can be straight or at a right angle. Briefly explain with a neat diagram, the AJM process. The surface finish can be obtained smooth.The cost of equipment is low.Ability to cut fragile and heat-sensitive material without damage.Ability to cut intricates hole shapes in a hard and brittle material.The main advantages are its flexibility, low heat production. The material removal rate will increase with the increase in gas pressure. This high-pressure water from the intensifier is moved to the nozzle as wells as in accumulator. The abrasive jet process produces surfaces that have high wear resistance. In abrasive jet machining, the capital cost is low as it is easy to operate. Materials such as garnet or corundum are used as abrasive agents. The Working principle of abrasive jet machining involves the use of a high-velocity stream of Compressed abrasives particles carried by a high-pressure gas through a nozzle on the workpiece. Jet velocity will be 150 to 300 m/sec and It is used for superalloys and Hard Materials. The abrasive particles used in AJM are - Aluminium oxide (Al 2 O 3), Silicon carbide (SiC), glass bead of 10-50µ for machining, Sodium bicarbonate for polishing work. Read: Abrasive Jet Machining (AJM) working principle and process parameters Applications of abrasive jet machining. The jet then passes through a venturi section where a metered amount of granular abrasive is drawn into the water stream. high velocity abrasive jet is made to impinge the work surface in a particular direction from a this machining process works on the basic principle of abrasive erosion if a high velocity abrasive particles strike on a hard or brittle work piece it remove some metal at the striking surface this metal removal process takes place due to brittle It is due to the fact that the kinetic energy of the gas is used for moving the abrasive particles. The process is free from chatter and vibration as there is no contact between the tool and the workpiece. Because of repeated impacts small bits of material get loosened which is carried away by jet and exposing the fresh surface to the jet. Abrasive Jet Machining is a non-conventional mechanical machining method. So that the abrasives and the gases will be mixed thoroughly in the mixing chamber. The filter is used to cleaning the fuel supply so that dirt or other impurities do not hamper the progress of the process. Abstract:- Abrasive Jet Machine is the device used to remove material by means of high velocity carrier gas and Abrasive mixture. The process of impinging the high-speed stream of abrasive particles by high-pressure gas or air on the work surface through a nozzle and metal removal occurs due to erosion caused by high-speed abrasive particles. Abrasive Jet Machining: Principles, Advantages, And Limitations. This is due to the fact that the mass flow rate of the gas decreases with an increase of abrasive flow rate and hence mixing ratio increases so that it will do a decrease in material removal rate because of decreasing available energy for erosion. Working Principle of ultrasonic Machining: It consists of an electromechanical transducer connected to the AC supply. As the abrasive particle impacts on the surface, it causes a tiny fracture, and the gas stream carries both the abrasive particles and the fractured (wear) particles away. It consists of a mixing chamber, gas filter, pressure gauge, regulator, and the nozzle. Here we supply the abrasive particles and there already the amount of compressed air comes from the pipe. In this machining, the Abrasive particle size is 10-40 Micros. Principle: AJM uses a stream of fine grained abrasives (of size 10 to 40 microns) mixed with air or some other carriers gas at high pressure. What is the fundamental principle of abrasive jet machining? Within the nozzle is a mixing chamber in which a partial vacuum is created as water passes. The nozzle is made of either circular or rectangular cross-section and the head can be straight or at a right angle. The impact of the particles develops a sufficiently concentrated force to perform operations such as cutting, the material is removed by the erosion of work material with abrasive grits at a speed of 150-300m/s. Abrasive jet machining is a non-traditional machining process which is mostly used in machining of hardened metals. Abrasive Jet Machining process - Working Principle: In this AJM system, a focused stream of abrasive grains of Al2O3 or Sic carried by high pressure gas or air at a high velocity is made to impinge on the work surface through a nozzle of 0.3 to 0.5 mm diameter. The carrier gas should be cheap and non-toxic and easily available, It is generally air or nitrogen. Amardeep will share information related to Mechanical Engineering in this platform. Aluminum oxide (Al2O3) size of 12, 20, 50 microns and it is good for cleaning, cutting, and deburring, Dolomite size of 200 mesh and it is used for Etching and polishing. In abrasive cutting, the system mixes a hard, powdery material into the water jet. 3.2.1. As the mass flow rate of abrasive increases its velocity decreases and will thereby decrease the available energy for erosion and ultimately the material removal rate. Here we also use compressed air instead of other gas. For making the object, the raw material is pushed into a die to provide it with the desired shape. The material of the nozzle should be able to withstand corrosion. It is used for abrading and frosting glass, ceramics, and refractories and it is more economical as compared to etching or grinding. He is the author, editor at themechanicalengineering.com, Your email address will not be published. generally above 16 kHz. The divergence of jet stream increases resulting in more irregular cutting and high inaccuracy. In AJM, how is … Abrasive powders cannot be reused as the sharp edges are worn and smaller particles can jam the nozzle. As I said before that the velocity of the jet is about 1000 km/hr. Copyright © 2020 TheMechanicalEngineering.com. Common Welding and Inspection Methods for Carbon Steel Elbows. Working Principle of Abrasive Jet Machining: The figure shown is the above Abrasive jet Machining. It is used in fine drilling and aperture drilling for an electronic microscope. Here the work is to clean the fuel if there are any dust particles present. A dust collection system is a basic requirement to prevent atmospheric pollution and health hazards so the extra cost will be there. The high velocity abrasive particles remove the material by micro-chipping action as well as brittle fracture of the work material. Abrasive cutting is more suitable for hard materials such as metal, steel, stone, marble, ceramics, glass, bullet-proof glass, wood, graphite or laminates. To control the size and shape of the cut, either workpiece or nozzle is moved by cams, pantographs, or any other suitable mechanism. This device will check the required amount of pressure is there or not. But after reaching optimum value, MRR decreases with a further increase in the abrasive flow rate. OPS! In abrasive-jet machining, a high-velocity jet containing abrasive particles is aimed at the workpiece surface under controlled conditions. The filtered gas at a pressure of 2 to 8 kgf/cm2 is supplied to the mixing chamber containing the abrasive powder and. Construction of Abrasive jet machining process Common uses include cutting heat-sensitive, brittle, thin, or hard materials. The other mechanical machining method is Abrasive jet Machining. Abrasive Jet machining Consists of several Parts like: Gas is supply to the system for the operation. Raw material is pushed into a die to provide you quality Notes, updates, Limitations... Gas flow and pressure learn mechanical is created as the sharp edges are worn and smaller can. 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