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

For a good understanding of construction and working of AJM, refer the schematic diagram above. Specifically it is used to cut intricate shapes or form xjm edge shapes.

The surface machined can have good anm by controlling the grain machinig mainly. If you continue to use this site we kachining assume that you are happy with it. It also helps protecting workers from lung dieses caused by exposing into atmosphere containing excessive tiny abrasive dust. Hopper is sometime vibrated to avoid bridging jamming at outlet.

Cutting and drilling machininy —AJM can also be utilized for cutting various shapes as well as for drilling holes. I am a mechanical engineer with a passion for technical stuff. Nontraditional Manufacturing Processes by G.

First it compresses the gas and then mixes it with the abrasive in a mixing chamber. Different types of welding defects. Material removal rate and its estimation Knowledge of material removal rate MRR is beneficial for selecting process parameters and choosing feed rate of the nozzle. From Wikipedia, the free encyclopedia. The following Figure shows the variation in the diameter of cut with change in the stand off distance SOD.

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There are some allowances which are responsible for the difference in the dimensions of the casting and the pattern It basically determines concentration of abrasives in the jet. It is evident that the SOD changes the abrasive particles spreads i.

Chamber is vibrated to obtain homogeneous mixing. Higher gas pressure reduces jet spreading and thus helps in cutting deeper slots accurately. Common applications of abrasive jet machining process are provided below.

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

Deburring machinign 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. The distance between the nozzle tip and the work surface has great influence on the diameter of cut, its shape and size and machinong rate of material removal.

Abrasive jet machining can be advantageously utilized for multifarious purposes including surface cleaning, deburring, machinig and even making holes. ApplicationsTexas Airsonics, archived from the original on March 4, However, ductile and brittle materials behave differently in indent formation, and thus size of indentation created by the impact of single abrasive grit is different for ductile and brittle materials.

It forces the abrasive jet over the workpiece. Machinijg may also Read: A vibrator is used to control the feed of the abrasive powder. Different abrasives having a range of grit size can be utilized based on workpiece material and the operation it is intended to perform. Engraving —As an alternative to laser beam machining, abrasive jet machining can also be applied for incising purposes irrespective of chemical and electrical properties of work material. How material removal rate can be increased?

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The aim elements in AJM are abrasive, carrier gas and the nozzle as schematically shown in the following Figure. 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.

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

Another disadvantage is that the process produces a tapered cut. There are many factors that can influence abrasive jet machining performance. Hard materials and materials of high strength can be easily machined. Mishra Narosa Publishing House. Nozzle life is less.

It controls the abrasive powder feed rate in the mixing chamber. Effects of abrasives on AJM machinihg As discussed earlier, shape, size, machinlng, material and flow rate of abrasive can influence machining performance. What is the basic mechanism of material removal in AJM?

This site uses cookies: 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 machiining and v work material—its mechanical properties and stress concentration.

A fine abrasive jet is rendered by the nozzle. Different Types of Pattern Allowances in Casting. It is used to mix the gas and abrasive particles. Size of abrasives also influences quality of cut as well as material removal rate.