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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Compressed air is then passed into the mixing chamber. This gives easy, accurate and precise control and is suitable for cutting intricate profiles and contours.

Abrasive jet machining

Basic purpose of carrier gas in abrasive jet machining is to accelerate fine abrasive particles by momentum transfer. Explain its effect on AJM performance. Abrasive jet machining can be advantageously utilized for multifarious purposes including surface cleaning, deburring, abrading and even making holes.

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Higher gas pressure reduces jet spreading and thus helps in cutting deeper slots accurately. Holes of intricate shapes could be produced efficiently. Important process parameters include i mwchining particles—its shape, size, strength, material and flow rate; ii carrier gas—its nature, composition, flow rate, pressure and temperature; iii abrasive jet—mixing ratio, striking velocity, impingement angle and stand-off distance; iv nozzle—its profile and inner diameter; and v work material—its mechanical properties and stress concentration.

Its purpose is to mix abrasives with pressurized carrier gas. However, various accessories including pipeline must be capable enough to handle such high pressure without failure.

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Irregular shape abrasives having sharp edges tend to produce higher MRR as compared to spherical grits. The pressure of this mixture is regulated and sent to nozzle.

Abrasive Jet Machining – Process, Parameters, Equipment, MRR

You may also Read: This process is best suited for machining super alloys and refractory type of materials, and also machining thin sections of hard materials and making intricate hard holes. The operating elements in AJM are abrasive, carrier gas and the nozzle as schematically shown in the following Figure. Carrier gas for abrasive jet machining Basic purpose of carrier gas in abrasive jet machining is to accelerate fine abrasive particles by momentum transfer.

Deburring —Abrasive jet machining is one of the efficient methods for deburring process for removal of burr of milled features and drilled holes, especially when work material is hard.

Abrasive Jet Machining (AJM) «

Jain Allied Publishers Private Limited. Abrasive jet machining is best suited for machining brittle and heat sensitive materials like glass, quartz, sapphire, ceramics etc, It is used for drilling holes, cutting slots, cleaning hard surfaces, deburring, polishing etc.

macbining Process capability of abrasive jet machining Materials: When an abrasive particle like Al2O3 or SiC having sharp edges hits a brittle and fragile material machinig a high speed, it makes dent into the material and lodges a small particle from it by a tiny brittle fracture.

Nozzle also directs high velocity jet towards work surface from a specific distance called SOD and at a particular predefined angle, called impingement angle.

The lodged out or wear particle is carried away by the air or gas.

The inside diameter ID of the nozzle through which abrasive particles flow is about 0. Larger grit size tends to produce larger cavity and thus MRR improves with the sacrifice of surface finish. Process Parameters of Abrasive Jet Machining.

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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. Such cleaning processes include removal of oxide, paint, coating, stain, glue, loose sand particles, etc. Frequent changing of nozzle is associated with idle time during machining.

In the mixing chamber, the abrasive is allowed to flow into the gas stream. This process is quite suitable for machining brittle, heat resistant and fragile materials like, glass, ceramic, germanium, mica etc. It is provided below the mixing chamber. Process parameters and their influence on AJM There are many factors that can influence abrasive jet machining performance.

There are some allowances which are responsible for the difference in the dimensions of the casting and the pattern A pressure gauge xjm a flow regulator are used to control the pressure and regulate the flow rate of the compressed air. Effects of abrasives on AJM performance As discussed earlier, shape, size, strength, material and flow rate of abrasive can influence machining performance.

Abrasive Jet Machining (AJM) Process Advantages and Disadvantages – Mechanical Engineering

Nonconventional Machining by P. Written by Surjeet Sankararaj I am a mechanical engineer with a passion for technical stuff. So it removes water vapor and dust particles to avoid condensation or jamming during compression.