Abrasive jet machining (ajm)

Hi This is upendra kumar malla.Completed B.Tech mechanical and working in a private sector. I want to share my knowledge to students through this channel.
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1. Abrasive Jet Machining (AJM) UPENDRA KUMAR MALLA

2. What is AJM ? Abrasive Jet Machining (AJM), also known as micro-abrasive blasting, is a mechanical energy based unconventional machining process used to remove unwanted material from a given workpiece.

3. Working principle The process makes use of an abrasive jet with high velocity, to remove material and provide smooth surface finish to hard metallic workpieces

4. Working principle

5. Schematic Diagram of Abrasive Jet Machining

6. Components of AJM 1.Abrasive jet: It is a mixture of a gas (or air) and abrasive particles. Gas used is carbon-di-oxide or nitrogen or compressed air. The selection of abrasive particles depends on the hardness and Metal Removal Rate (MRR) of the workpiece. Most commonly, aluminium oxide or silicon carbide particles are used.

7. Components of AJM 2.Mixing chamber: It is used to mix the gas and abrasive particles 3.Filter: It filters the gas before entering the compressor and mixing chamber 4.Compressor: It pressurizes the gas.

8. Components of AJM 5.Hopper: Hopper is used for feeding the abrasive powder. 6.Pressure gauges and flow regulators: They are used to control the pressure and regulate the flow rate of abrasive jet. 7.Vibrator: It is provided below the mixing chamber. It controls the abrasive powder feed rate in the mixing chamber.

9. Components of AJM 8.Nozzle: It forces the abrasive jet over the workpiece. Nozzle is made of hard and resistant material like tungsten carbide

10. Operations performed using AJM Drilling Boring Surface finishing Cutting Cleaning Deburring Etching Trimming Milling

11. Advantages Disadvantages Metal removal rate is low In certain circumstances, abrasive particles might settle over the workpiece. Nozzle life is less. Nozzle should be maintained periodically. Abrasive Jet Machining cannot be used to machine soft materials. Surface of the workpiece is cleaned automatically. Smooth surface finish can be obtained. Equipment cost is low. Hard materials and materials of high strength can be easily machined.

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