ABRASIVE JET MACHINING AJM PDF

Abrasive jet machining (AJM) is one of the modern machining processes where high velocity jet of abrasives mixed with dehumidified pressurized gas is made. PDF | Abrasive jet machining (AJM) is a manufacturing technology based on erosion localization and intensification. AJM has a progressively. PDF | As Abrasive jet machining (AJM) is similar to sand blasting and effectively removes hard and brittle materials. AJM has been applied to rough working.

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Abrasive Jet Machining (AJM) «

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.

Size of abrasives machinihg influences quality of cut as well as material removal rate. Ceramic abrading and glass frosting —Very hard materials including glass, refractory, stone, etc.

Sometime movement of work table is controlled by servo mechanism. Jain Allied Publishers Private Limited. 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.

Every conventional tool-based machining process inherently produces burr. Indefinite increase in MRR is not practically feasible because of limited capability of equipment and accessories. Engraving is the process of incising pattern, letter, art or design on a solid abrasve for decorative or artistic or formal purposes.

AJM utilizes various abrasives including alumina, silicon carbide, glass beads, sodium bicarbonate, etc. If you continue to use this site we will assume that you are happy with it. Controlled abrasive jet machining can be utilized for removing flash known as deflashing to get desired clean product with higher dimensional accuracy and tolerance as well as sumptuous appearance.

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Here momentum transfer takes place and abrasives start flowing with carrier gas. Choosing nozzle material is another decisive factor from economic point of view.

There are many factors that can influence abrasive jet machining performance. Category List Automobile Engineering Biomass Boiling heat transfer energy energy sources engineering materials. 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.

Compare various types of abrasives used in AJM process. Applications of abrasive jet machining AJM Work surface cleaning Although sand blasting or grit blasting is economical for this purpose, abrasive jet machining AJM can also be applied if tight quality of finished surface is desired. Working principle of abrasive jet machining with sketch.

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

If you continue to use this site we will assume that you are happy with it. In AJM, usually circular hopper with gradual compression is employed for continuously supplying fresh abrasive to the mixing chamber.

AJM should be avoided if work material is soft and ductile; otherwise quality of machined surface will be poor. Deflashing and trimming —Controlled abrasive jet machining can be utilized for removing flash to get desired clean product with higher dimensional accuracy and tolerance as well as sumptuous appearance. The contents of this article are listed below: Hopper is sometime vibrated to avoid bridging jamming at outlet. A properly designed casting, a properly prepared mould and correctly malted metal should result in a defect free abrqsive.

Retrieved from ” https: Abrasive particles used in abrasive jet machining 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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Abrasive Jet Machining – Process, Parameters, Equipment, MRR

Process of removal of burrs from machined surface is known as deburring. Alternative energy, fluid mechanics, strength of materials, thermodynamics, heat transfer, Power plant, Patterns in castingRenewable energy and all the cool mechanical stuffs for students are discussed here. As an alternative to laser beam machining, abrasive abrqsive machining can also be applied for such purpose irrespective of chemical and electrical properties of work material.

The lodged out or wear particle is carried away by the air or gas. In the mixing chamber, the abrasive is allowed to flow into the gas stream.

Primary function of nozzle in abrasive jet machining is to convert pressure energy of the pressurized gas-abrasive mixture into kinetic energy in the form of high velocity jet. Material is removed by fine abrasive particles, usually about 0.

Representative image Engraving is the process of incising pattern, letter, art or design on abraxive solid surface for decorative or artistic or formal purposes.

Abrasive jet machining

Gas used is carbon-di-oxide or nitrogen or compressed air. 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 form of high velocity jet.

MRR can be enhanced by proportionally increasing both the abrasive flow rate and gas flow rate at same rate so that mixing ratio remains constant.

In the mixing chamber, abrasive powder is fed.