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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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 – Process, Parameters, Equipment, MRR

By using this site, you agree to the Mschining of Use and Privacy Policy. Sometime commercially pure carbon di-oxide and nitrogen are also used to harness better performance for a particular purpose.

Irregular shape abrasives having sharp edges tend to produce higher MRR as compared to spherical grits. Abrasive jet machining can be advantageously utilized for multifarious purposes including surface cleaning, deburring, abrading and even making macjining.

MRR can be enhanced by proportionally increasing both the abrasive flow rate machininb gas flow rate at same rate so that mixing ratio remains constant. Different Types of Pattern Allowances in Casting.

Here momentum transfer takes place and abrasives start flowing with carrier gas.

The contents of this article are listed below: This site uses cookies: In AJM, usually circular hopper with gradual compression is employed for continuously supplying fresh abrasive to the mixing chamber. Ceramic abrading and glass frosting —Very hard materials including glass, refractory, stone, etc. We use cookies to ensure that we give you the best experience on our website. Important aj, 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 evident that the SOD changes the abrasive particles spreads i.

Abrasive Jet Machining (AJM) «

Advantages of abrasive jet machining Suitable for removal of deposits on surface Mwchining range of surface finish can be obtained Process is independent of electrical 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.

List of factors that affect abrasive jet machining performance. As an isentropic steady flow device, nozzle converts hydraulic energy pressure of the gas-abrasive mixture to the kinetic energy and ,achining high velocity jet is obtained. Equipment for abrasive jet machining Air compressor: Among the desired properties sufficient hardness, irregular shape, presence of sharp edges and good flow characteristics are essential.

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.

AJM utilizes various abrasives including alumina, silicon carbide, glass beads, sodium bicarbonate, etc. The cutting action is cool because the carrier gas serves as coolant.

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

The depth of damage to the surface is very little. The following Figure shows the variation in the diameter of cut with change in the stand off distance SOD. The operating elements in AJM are abrasive, carrier gas and the nozzle as schematically shown in the following Figure.

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AJM performance is usually assessed by analyzing three output responses, namely i material removal rate MRRii surface roughness and accuracy of machined feature, and iii nozzle life or nozzle wear rate. Benedict Macchining Engineering and Materials Processing Abrasive particles cannot be reused.

International Publishing House Pvt. Compressor unit also consists of drier and filter.

Carrier gas for abrasive jet machining Basic purpose of carrier gas in abrasive jet machining is to accelerate fine abrasive particles by momentum transfer.

As discussed earlier, shape, size, strength, material and flow rate of abrasive can influence machining performance. Mixing ratio M is the machiningg between mass flow rate of abrasive particles and mass flow rate of carrier gas. The distance between the nozzle tip and the work surface has great influence on the diameter of cut, its shape and size and also rate of material removal.

Effects of impingement angle on AJM performance. The tapering of hole especially, when the depth of the hole is more, becomes almost inevitable. This jet is used to remove unwanted material from the workpiece. Equipment cost is low.

Chamber is vibrated to obtain homogeneous mixing. Alternative energy, fluid mechanics, strength of materials, thermodynamics, heat transfer, Power plant, Patterns mmachining castingRenewable energy and all the cool mechanical stuffs for students are discussed here.