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

Engraving Engraving is the process of incising pattern, letter, art or design on a solid surface for decorative or artistic or formal purposes. The mixing ratio is generally controlled by abasive vibrator.

ApplicationsTexas Airsonics, archived from the original on March 4, However, holes, slots or pockets may lack accuracy as sharp corners cannot be obtained by this process.

Working principle of abrasive jet machining with sketch. AJM is also economic for producing frosted glass glass with pitted surface at one or both sides to reduce transparencyespecially when produced in large scale. It is basically the relative hardness between abrasives uet workpiece that determines machining capability and productivity.

Sometime movement of work table is controlled by servo mechanism. Advantages of abrasive jet machining Suitable for removal of deposits on surface Wide range of surface finish can machinnig obtained Process is independent of machjning or thermal properties No thermal damage of workpiece Suitable for nonconductive brittle materials Low capital investment Disadvantages of abrasive jet machining Not suitable for soft and ductile materials Abrasives are not reusable Abrasive collection and disposal are problematic Inaccurate cutting and drilling stray cutting Limited nozzle life Applications of AJM Abrasive jet machining can be advantageously utilized for multifarious purposes including surface cleaning, deburring, abrading and even making holes.

AJM performance is usually assessed by analyzing three output responses, namely i mavhining removal rate MRRii surface roughness and accuracy of machined feature, and iii nozzle life or nozzle wear rate. Another disadvantage is that the process produces a tapered cut. However, if work material is too soft, AJM should be avoided. Jain Allied Publishers Private Limited. The gas passes through a macihning nozzle before entering the mixing chamber, and then exits through a convergent nozzle.

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Abrasive Jet Machining (AJM) «

Engraving is the process of incising pattern, letter, art or design on a solid surface for decorative or artistic or formal purposes. Nozzle also directs jachining velocity jet towards work surface from a specific distance called SOD and at a particular predefined angle, called impingement angle. This jet is used to remove unwanted material from the workpiece.

Various components of AJM set-up and their functions.

As flow rate and compressor delivery pressure are constant, jet velocity will be inversely proportional to the jet cross-sectional area. Knowledge of material removal rate MRR is beneficial for selecting process parameters and choosing feed rate of the nozzle. The tapering of hole especially, when the depth of the hole is more, becomes almost inevitable.

Process of removal of burrs from machined surface is known as deburring. Irregular shape abrasives having sharp edges tend to produce higher MRR as compared to spherical grits.

Unconventional Machining Processes by T. 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.

It pressurizes the gas. Subscribe in a reader.

Hopper is used for feeding the abrasive powder. As an isentropic steady flow device, nozzle converts hydraulic energy pressure of the gas-abrasive mixture to the kinetic energy and thus high velocity jet is obtained. Category List Automobile Engineering Biomass Boiling heat transfer energy energy sources engineering materials.

Glass can also be frosted by abrasive jet machining. The lodged out or wear particle is carried away by the air or gas.

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Nonconventional Machining by P. Carrier gas is also made dust free before compressing to high pressure. A dust collecting chamber is a basic requirement to prevent atmospheric pollution to cause health hazards.

Abrasive-jet Machining (AJM)

Effects of carrier gas on abrasive jet machining performance. Different types of welding mzchining. Labels Automobile Engineering 24 Biomass 5 Boiling heat transfer 7 energy 40 energy sources 27 engineering materials. The basic unit is schematically shown in following Figure. Typical engraving applications for AJM includes—.

The contents of this article are listed below: Larger angle tends to create deeper penetration, while smaller angle tends to increase machining area. It is to be noted that, irrespective of the purpose, abrasive jet machining AJM is beneficial only for hard and brittle materials. It filters the gas before entering the compressor and mixing chamber. Nozzle life is less.

Enter your email address: As an alternative to laser beam machining, abrasive jet machining can also be applied for such purpose irrespective of chemical and electrical properties of work material. 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.

Why different abrasives produce different MRR? Among various gases, air is commonly used in AJM as it is abundantly available at free of cost. Its purpose is to mix abrasives with pressurized carrier gas.

However, variation in size in the entire volume should be low otherwise estimation or assessment will not be accurate. The process makes use of an abrasive jet with high velocity, to remove material and provide smooth surface finish to hard metallic workpieces.