Abrasive jet machining (AJM), also known as abrasive micro-blasting, pencil blasting and micro-abrasive blasting,is an abrasive blasting machining process that uses abrasives propelled by a high velocity gas to erode material from the workpiece. Additional cleaning of the work surface may occur as there is a possibility of sticking abrasive grains in softer materials. The disadvantages of the process lie in the following: That’s it, thanks for reading. In addition to the above abrasives, dolomite (calcium magnesium carbonate) of 200 grit size is found suitable for light cleaning and etching. Fig. It took less than 20 minutes to make with an abrasive jet, including setup and cleanup time! The cutting effectiveness is often increased by the addition of an abrasive compound to the jet stream. He completed his engineering studies in 2014 and is currently working in a large firm as Mechanical Engineer. The major application of Abrasive jet machining process is in the machining of essentially brittle materials and heat sensitive materials like glass, quartz, sapphire, semiconductor materials, mica and ceramics. This means that if precautions are not heeded, it may result in serious, or possibly even fatal, injury. Meaning of Abrasive Jet Machining (AJM): In this process a focused steam of abrasive particles (of size 10 to 40 microns) carried by high pressure gas or air at a velocity of about 200 to 400 m/sec is made to impinge on the work surface through a nozzle, and the work material is removed by erosion by the high velocity abrasive particles. The metal is removed due to erosion caused by the abrasive particles impacting the work surface at high speed. In AJM, air is compressed in an air compressor and compressed air at a pressure of around 5 bar is used as the carrier gas as shown in Fig. Dr. Yuvaraj N. Download with Google Download with Facebook. ABRASIVE JET MACHINING Melbin K Mathew 2. Abrasive jet machining (AJM) is one of the modern machining processes (mechanical energy based) where a high velocity jet of fine grain abrasives, mixed with compressed carrier gas, is utilized to erode material from work surface. Maintenance on the abrasive jet nozzle is simpler than that of a laser, though probably just as frequent. Water Jet cutting machines makes use of high pressure water for cutting softer materials such as rubber and foam. The abrasive jet is obtained by accelerating fine abrasive particles in highly pressurized gas (carrier gas). Nozzles have a great degree of abrasion wear, they are made of hard materials such as tungsten carbide or synthetic sapphire to reduce the wear rate. It consists of a mixing chamber, gas filter, pressure gauge, regulator, and the nozzle. Introduction Machining Conventional machining Unconventional maching Based on Mechanical energy (WJM,AJM,AWJM) JET : A rapid stream of liquid or gas forced out of a small opening. This is a part you might otherwise do on a mill. A typical set-up for abrasive jet machining is shown in the figure. Unwanted workpiece movement is the main source of error by new abrasive jet users. Waterjet cutting is the process where by a jet of water traveling at ludicrous speed (produced by putting water under high pressure and forcing it through a small orifice) cuts through materials by eroding the material away at the point of contact. Saif M. is a Mechanical Engineer by profession. They are quick to set up, and offer quick turn-around on the machine. In this machining process a focus stream of abrasive particles are forces to impinge on work piece at high velocity. The filtered gas at a pressure of 2 to 8 kgf/cm 2 is supplied to the mixing chamber containing the abrasive powder and. or. This pipeline carries a pressure gauge and a regulator to control the gas flow and its pressure. It is also used in cutting slot, thin sections, countering, drilling, for producing integrate shapes in hard and brittle materials. The jet drives a large quantity of air into the catcher tank below the work. Glass beads of diameter 0.30 to 0.60 mm are used for light polishing and deburring. Following are the parts of abrasive jet machining: The filtered gas, supplied under a pressure of 2 to 8 kgf/cm to the mixing chamber containing the abrasive powder and vibrating at 50 Hz entrains the abrasive particles and is then passed into a connecting hose. The amount of abrasive is controlled by the amplitude inducing vibration (at 50Hz). and their uses with pictures. A regulator is incorporated in the line to control the flow of abrasive particles compressed air or high-pressure gas is supplied to the mixing chamber through a pipeline. Fig.1 - Diagram showing the difference between a pure water … Abrasive feeder supplies the required amount of abrasive jet at optimum pressure and velocity. Create a free account to download. With repeated impacts, small bits of material get loosened and a fresh surface is exposed to the jet. Fig. Waterjet machining utilizes a high pressure stream of water to erode a narrow line in the stock material. International Journal of Applied Engineering Research, ISSN 0973-4562 Vol. The gases used are nitrogen, carbon dioxide or clean air. Fixtures are needed to locate the workpiece relative to the coordinate axes of the machine and to keep it in place while the machining is in progress. An abrasive is small, hard particle having sharp edges and an irregular shape . This venturi action draws garnet abrasive into the cutting head. Abrasive Jet Micro Machining (AJMM) is a relatively new approach to the fabrication of micro structures. To control the size and shape of the cut either the workpiece or the nozzle is moved by cams, pantographs or other suitable mechanisms. 8 (a) shows the schematic diagram of abrasive Water Jet Machining. Read also: Types of Unconventional Machining Process [Manufacturing]. Nozzles made of tungsten carbide have an average life of 8 to 12 hours. 8 (b). A regulator is incorporated in the line to control the flow of abrasive particles compressed air or high-pressure gas is supplied to the mixing chamber through a pipeline. The abrasives generally used are silicon carbide, aluminium oxide, glass powder or specially prepared sodium bicarbonate. Water Jet Machining (WJM) also called water jet cutting, is a non-traditional machining process in which high-velocity jet of water is used to remove materials from the surface of the workpiece.WJM can be used to cut softer materials like plastic, rubber or wood. If you found this article helpful share with your friends. The material removal rate is slow and its application is therefore limited. The removal occurs due to the erosive action of the particles striking the workpiece surface. On normal production work, the accuracy of +0.1 mm is easily held. Ability to cut intricate hole shapes in materials of any hardness and brittleness. Ability to cut fragile and heat-sensitive materials without damage as no heat is generated due to the passing of gas or air. 2 Setup of Abrasive Jet Machining. 2 . The abrasive particles are held in a suitable holding device, like a tank and fed into the mixing chamber . This outgoing high-speed stream of the mixture of gas and abrasive particles is known as abrasive jet. 2.0 About this manual . AJM set-up comprises air compressor fitted with drier and cleaner, abrasive feeder and vibratory mixing chamber, nozzle, well ventilated machining chamber and various gauges … This abrasive and gas mixture emerges from a small nozzle mounted on a fixture at a high velocity ranging from 150 to 300 m/min. These particles mic in the gas stream, travel further through a hose and finally pass through the nozzle at a considerably high speed. Then the abrasive water jet is passed through the focussing tube for creating square pin textures on the surface of brass sheet as shown in Fig. These are generally made of... © Copyright 2021 TheEngineersPost.com - All Rights Reserved, Abrasive Jet Machining (AJM): Parts, Working Principle, Advantages & Applications, Working Principle of Abrasive Jet Machining, Types of Unconventional Machining Process [Manufacturing], What is TIG & MIG Welding: Difference Between TIG and MIG welding, What is Underwater Welding and types of Underwater welding?, Cams and Followers: How they Work? While larger sizes are used for rapid removal rate. We can cut any difficult shapes and create holes in glass and brittle material using compressed air and abrasive particles. The machining accuracy is poor and the nozzle wear rate is high. Abrasive Water Jet Machining process: A state of art of review. It is the material removal process where the material is removed by high velocity stream of air/gas or water and abrasive mixture . A compressor is used which is connected through PU pipe to control valve. ABRASIVE JET MACHINING SETUP . Types, Nomenclature [Diagrams & PDF], 14 Types of Washers & How They Use? Precision abrasive jet machines can obtain about the same or higher tolerances than lasers (especially as thickness increases). This abrasive jet machining project is used for cutting any integrated shapes on brittle materials like glass. also fig shows the other major parts of the AJM system. Abrasive Jet Machine Setup and Construction Details, AJM working principle and process parameter, Types of AJM abrasive material and its specific application, Applications, advantages, and disadvantages of AJM, How stream get high velocity when passed through the convergent nozzle, Ultrasonic machining USM construction and working, Electron beam machining EBM construction, operating principle and working, Types of Pattern Material - Application, Advantages And Limitation, 3-2-1 Principle of Location (Six Point Principle) Degree Of Freedom Controlled By 3-2-1 Location Principle - With Image, Different Types of Cutting Tools Materials and Their Properties, Basic Components of IC Engine and Their Function, Design and Working Principle of Simple Carburetor, Effect of standoff distance on material removal rate. In this machining process a high speed steam of water jet impinge on the work piece which removes metal from contact surface by erosion. machine damage. Abrasive Jet Machining INTRODUCTION Abrasive water jet machine tools are suddenly being a hit in the market since they are quick to program and could make money on short runs. abrasive water jet machine 1. This process is mainly employed for such machining works which are otherwise difficult, such as thin sections of hard metals and alloys, cutting of material which is sensitive of heat damage, producing intricate holes, deburring, etching, polishing etc. Actual machining time is about 6 minutes. The process finds application in cutting slots, thin sections, contouring, drilling, for producing shallow crevices, deburring, and for producing intricate shapes in hard and brittle materials. Large sheets of raw material and cut multiple blanks with very little setup and time. By the amplitude of vibration of the head though it had been sandblasted in! 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