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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In AJM, usually circular hopper with gradual compression is employed for continuously supplying fresh abrasive to the mixing chamber. Abrasive jet machining AJM is one of the advanced machining processes mechanical energy based where a high velocity jet of abrasives is utilized to remove material from work surface by impact erosion. Cutting and drilling hole —AJM can also be utilized for cutting various shapes as well as for drilling holes. Most commonly, aluminium oxide or silicon carbide particles are used.

A fine abrasive jet is rendered by the nozzle. Abrasive jet machining AJMalso known as abrasive micro-blasting jam, pencil blasting and micro-abrasive blasting[1] is an abrasive nachining machining process that uses abrasives propelled by a high velocity gas to erode material from the workpiece. If you continue to use this site we will assume that you are happy with it. Abrasive particles used in abrasive jet machining Jam AJM, it is assumed that hard abrasive particles participate in material removal action, while carrier gas assists to blow away mqchining particles from machining zone.

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Indefinite increase in MRR is not practically feasible because of limited capability of equipment and accessories.

Abrasive Jet Machining – Process, Parameters, Equipment, MRR

The following Figure shows the variation in the diameter of cut with change in the stand off distance SOD. Sometime movement of work table is controlled by servo mechanism. Alternative energy, fluid mechanics, strength of ajn, thermodynamics, heat transfer, Power plant, Patterns in castingRenewable energy and all the cool mechanical stuffs for students are discussed here. Explain its effect on AJM performance.

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

International Publishing House Pvt. Effects of mixing ratio on AJM performance Mixing ratio M is the ratio between mass flow rate of abrasive particles and mass flow rate of carrier gas. Smaller size grits produce highly finished surface but reduce material macchining rate MRR and thus productivity descends. However, ductile and brittle materials behave differently in indent formation, and thus size of indentation created by the impact of single abrasive grit is different for ductile and brittle materials.

AJM should be avoided if work material is soft and ductile; otherwise quality of machined surface will be poor.

Larger angle tends to create deeper penetration, while mahcining angle tends to increase machining area. Why different abrasives produce different MRR? Establish analytical formula for MRR Modeling.

Abrasive jet machining

A compressor is used to elevate pressure of the carrier gas as high as 20bar ; abrasive grits are mixed with it in a mixing chamber as per mixing ratioand a nozzle is used to convert pressure energy into kinetic energy in the machiningg of high velocity jet.

The contents of this article are listed below:.

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Primary function of nozzle in abrasive jet machining is to convert maachining energy of the pressurized gas-abrasive mixture into kinetic energy in the form of high velocity jet. Mass flow rate of abrasive is usually controlled by Mixing Ratio, whose effects are also discussed later in this section. They are used to control the pressure and regulate the flow rate of abrasive jet. What is the basic mechanism of material removal in AJM? Hard and brittle material preferred.

Abrasive jet machining can be advantageously utilized for multifarious purposes including surface cleaning, deburring, abrading and even making holes. Here momentum transfer takes place and aj start flowing with carrier gas.

The lodged out or wear particle is carried away by the air or gas. Size of abrasives also influences quality of cut as well as material removal rate. Dry air or gas is filtered and compressed by passing it through the filter and compressor. It is to be noted that, irrespective of the purpose, abrasive jet machining AJM is beneficial only for hard and brittle materials. From Wikipedia, the free encyclopedia.

Different abrasives having a range of grit size can be utilized based on workpiece material and the operation it is intended to perform. Types of patterns used in Casting Process. Gas used is carbon-di-oxide or nitrogen or compressed air. Effects of carrier gas on abrasive amm machining performance.

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