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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The contents of this article are listed below: Such cleaning processes include removal of oxide, paint, coating, stain, glue, loose sand particles, etc. Equipment cost is low. For the process that uses water as a carrier, see Water jet cutter.

Material is removed by fine abrasive particles, usually about 0. Various components of AJM set-up and their functions. Higher SOD causes spreading of jet and thus its cross-sectional area increases with the sacrifice of jet velocity.

Hard and brittle material preferred. Mixing ratio can be increased by increasing abrasive percentage and in such case an increasing trend in MRR can be noticed because larger number of abrasives participates in micro-cutting action per unit time.

Abrasive Jet Machining – Process, Parameters, Equipment, MRR

Surface of the workpiece is cleaned automatically. Subscribe in a reader. Compressed air is then passed into the mixing chamber. However, excessive concentration of abrasive in the jet can significantly reduce MRR because of lower jet velocity as gas pressure is constant and unavoidable collision thus loss of machinjng energy. The nozzle can be hand held or mounted in a fixture for automatic operations. Solar Collectors Solar energy solid mechanics Thermodynamics units wave energy.

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Larger grit size tends to produce larger cavity and thus MRR improves with the sacrifice of surface finish. ApplicationsTexas Airsonics, archived from the original on March 4, If you continue to use this site we will assume that you are happy with it. It is used to mix the gas and abrasive particles.

Another disadvantage is that the process produces a tapered cut. A number of such gauges are employed for measuring pressure of carrier gas as well as gas-abrasive mixture. Unconventional Machining Processes by T.

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

By using this site, you agree to the Terms of Use and Privacy Policy. Distance from the work surface to the tip of nozzle in abrasive jet machining set-up is called Stand-Off Distance, abbreviated as SOD. Knowledge of material removal rate MRR is beneficial for selecting process parameters and choosing feed rate of the nozzle. However, holes, slots or pockets may lack accuracy as sharp corners cannot be obtained by this process.

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. It compresses the carrier gas to a pressure of 15 — 20bar. Specifically it is used to cut intricate shapes or form specific edge shapes.

It also enhances MRR.

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Abrasive Jet Machining (AJM) «

Disadvantages of Abrasive Jet Machining: The basic unit is schematically shown in following Figure. Carrier gas pressure along with nozzle diameter determines final jet velocity and thus machining performance. I am a mechanical engineer with a passion for technical stuff. The depth of damage to the surface is very little. Compare various types of abrasives used in AJM process.

It filters the gas before entering the compressor and aim chamber. Compressor unit also consists of drier and filter. I am the founder and former editor-in-chief of Mechteacher. As a consequent, machining deeper slots or hole becomes difficult; instead a wider area is cut. Inner diameter of the nozzle is paramount parameter as it determines final velocity and cross-sectional area of the jet for certain gas pressure.

The feed motion can be given either to the work holding device or to the nozzle. Under few assumptions, MRR for abrasive jet machining for different materials can be modeled analytically and can be expressed as provided below. Ajjm necessitates thicker and stronger pipelines and other accessories to smoothly handle such high pressure without leakage and rupture. Effects of mixing ratio on abrasive jet machining performance. Larger angle tends to create deeper penetration, while smaller angle tends to increase machining area.

Machiining Manufacturing Engineering and Materials Processing

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