AJM MACHINING PDF

Abrasive jet machining (AJM) utilizes a high velocity jet of abrasives to remove material from work surface by impact erosion. Get an overview of AJM process. AJM Advantages: This process is significant for machining breakable, heat resistant materials like ceramic, glass, germanium, mica etc. components of abrasive jet machining Abrasive delivery system . Abrasive Jet Machining In AJM, generally, the abrasive particles of around.

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Abrasive Jet Machining (AJM) – Process, Parameters, Equipment, MRR

Usually tungsten carbide WC or sapphire nozzles are used in industrial applications. Various components macuining AJM set-up and their functions. Functions of nozzle in abrasive jet machining Can you choose AJM nozzle with arbitrary inner diameter?

ApplicationsTexas Airsonics, archived from the original on March 4, Formulas for MRR in abrasive jet machining process.

Views Read Edit View history. The following Figure shows the variation in the diameter of cut with change in the stand off distance SOD.

Mixing ratio M is the ratio between mass flow rate of abrasive particles and mass flow rate of carrier gas. The abrasive particles may remain embedded in the work surface.

Material is removed by fine abrasive particles, usually machhining 0. If you continue to use this site we will assume that you are happy with it.

Gas used is carbon-di-oxide or nitrogen or compressed air. Retrieved from ” https: Different abrasives having a range of grit size can be utilized based on workpiece material and the operation it is intended to perform.

Common uses include cutting heat-sensitive, brittle, thin, or hard materials.

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It forces the abrasive jet over the workpiece. The surface machined can have good finish by controlling the grain size mainly. First it compresses the gas and then mixes it with the abrasive in a mixing chamber. A dust collecting chamber is a basic requirement to prevent atmospheric macining to cause health hazards. Before machiing, carrier gas is dehumidified properly as presence of steam can block pipelines. Nozzle life is less.

Chamber is vibrated mzchining obtain homogeneous mixing. Abrasive jet machining AJMalso known as abrasive micro-blastingpencil blasting and micro-abrasive blasting[1] is an abrasive blasting machining process that uses abrasives propelled by a high velocity gas to erode material from the workpiece. The following factors affect the choice of a pattern. The particle and gas mixture comes out of the nozzle inside the machining chamber of the machine tool unit.

Nonconventional Machining by P. Hard materials and materials of high strength can be easily machined. Carrier gas pressure macjining with nozzle diameter determines final jet velocity and thus machining performance.

The inside diameter ID of the nozzle through which abrasive particles flow is about 0. This necessitates thicker and stronger pipelines and other accessories to smoothly handle such high pressure without leakage and rupture.

Distance from the work surface to the tip of nozzle in abrasive jet machining set-up is called Stand-Off Distance, abbreviated as SOD.

Labels Automobile Engineering 24 Biomass 5 Boiling heat transfer 7 energy 40 energy sources 27 engineering materials. Effects of abrasives on AJM machininf As discussed earlier, shape, size, strength, material and flow rate of abrasive can influence machining performance.

Different Types of Welding Defects. In the mixing chamber, abrasive powder is fed. Compressed air is then passed into the mixing chamber. Higher SOD causes spreading of jet and thus its cross-sectional area increases with the sacrifice of jet velocity. Can u help me here? In AJM, it is assumed that hard abrasive particles participate in material removal action, while carrier gas assists to blow away eroded particles from machining zone.

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It is used in the industries as well in the different everyday objects we use. It can be utilized for cutting, drilling, polishing, deburring, cleaning etc. It also enhances MRR. As flow rate and compressor delivery pressure are constant, jet velocity will ahm inversely proportional to the jet cross-sectional area.

Abrasive jet machining

Different types of welding defects. On the other hand, fine abrasives reduce MRR but improve surface quality and accuracy. Metal removal rate is low In certain circumstances, abrasive particles might settle over the workpiece. Mass flow rate of abrasive is usually controlled by Mixing Ratio, whose effects are also discussed later in this section. How material removal rate can be increased?

Carrier gas pressure and its machinibg rate are two paramount factors that determine performance and machining capability. Newer Post Older Post Home. It also facilitates accurate estimation of productivity, delivery time as well as production cost.

Abrasive jet machining – Wikipedia

Compare various types of abrasives used in AJM process. Hopper is sometime vibrated to avoid bridging jamming at outlet. A nozzle is used to convert this pressure energy into kinetic energy and also to direct the jet towards work surface at a particular angle impingement angle. Ceramic abrading and glass frosting —Very hard materials including glass, refractory, stone, etc.