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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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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.

Abrasive jet machining – Wikipedia

We use cookies to ensure that we give you the best experience on our website. Different Types of Welding Defects. Basic purpose of carrier gas in abrasive jet machining is to accelerate fine abrasive particles by momentum transfer. Here momentum transfer takes place and abrasives start flowing with carrier gas. Establish analytical formula for MRR Modeling. It also helps protecting workers from lung dieses caused by exposing into machhining containing excessive tiny abrasive dust.

As a consequent, machining deeper slots or hole becomes difficult; instead a wider area is cut.

Dry air or gas is filtered and compressed by passing it through the filter and compressor. Among the desired properties sufficient hardness, irregular shape, presence of sharp edges and good flow characteristics are essential. Material is removed by fine abrasive particles, usually about 0. 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.

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Chamber is vibrated to obtain homogeneous mixing. In such case, higher pressure of the carrier gas has to be utilized. The harder is the abrasive with respect to work surface hardness, the larger will be the volume removal rate. As discussed earlier, shape, size, strength, material and flow rate of abrasive can influence machining performance.

Mild steel is the most commonly used steel. Mixing ratio M is the ratio between mass flow rate of abrasive particles and mass flow rate of carrier gas.

Abrasive Jet Machining – Process, Parameters, Equipment, MRR

Higher gas pressure reduces jet spreading and thus helps in cutting deeper slots accurately. ApplicationsTexas Airsonics, archived from the original on March 4, However, pure oxygen is not used as it can quickly oxidize the work surface. The nozzle can be hand held or mounted in a fixture for automatic operations. It also enhances MRR. When gas is compressed to high pressure, steam may condense and tiny water particles can create a larger globule after agglomerating with abrasives.

The abrasive jet is obtained by accelerating fine abrasive particles in highly pressurized gas carrier gas.

Important process parameters include i abrasive 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.

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It is basically the relative hardness between abrasives and workpiece that determines machining capability and productivity.

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

The distance of the nozzle from the workpiece affects the size of the machined area and the rate of material removal. AJM should be avoided if work material is soft and ductile; otherwise aj, of machined surface will be poor. The following factors affect the choice of a pattern. Cutting and drilling hole —AJM can also be utilized machinung cutting various shapes as well as for drilling holes. It is used in the industries as well in the different everyday objects we use.

Nonconventional Machining by P. Higher SOD causes spreading of jet and thus its cross-sectional area increases with the sacrifice of jet velocity. A vibrator is used to control the feed of the abrasive powder.

Different types of welding defects. However, for very hard work material, silicon carbide SiC is preferred as it is harder than alumina. Thus an optimum value of stand-off distance is required to set for obtaining satisfactory performance in abrasive jet machining. Nontraditional Manufacturing Processes by G.