Propz Me Life AJM MACHINING PDF

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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A pressure gauge and a flow regulator are used to control the pressure and regulate the flow rate of the compressed air. Why different abrasives produce different MRR? It is to be noted that, irrespective of the purpose, abrasive jet machining AJM is beneficial only for hard and brittle materials. A close working chamber, inbuilt with proper exhaust system, is usually maintained in order to avoid environmental pollution. Mass flow rate of abrasive is usually controlled by Mixing Ratio, whose effects are also discussed machlning in this section.

Hopper is used for feeding the abrasive powder.

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

Get Fresh Content from Mechteacher. Compressed air is then passed into the mixing chamber. Nozzle is made of hard and resistant material like tungsten carbide. Applications of AJM process. A number of such gauges are employed for measuring pressure of carrier gas as well as gas-abrasive mixture.

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Hard materials and materials of high strength can be easily machined. However, various accessories am pipeline must be capable enough to handle such high pressure without failure. A fine abrasive jet is rendered by the nozzle. By using this site, you agree to the Terms of Use and Privacy Machoning. The gas passes through a convergent-divergent nozzle before entering the mixing chamber, and then exits through a convergent nozzle.

The process can be easily controlled to vary the metal removal rate which depends on flow rate and size of abrasive particles. If you continue to use this site we will assume that you are happy with it.

Abrasive Jet Machining – Process, Parameters, Equipment, MRR

Compare various types of abrasives used in AJM process. Process capability of abrasive jet machining Materials: Dry air or gas is filtered and compressed by passing it through the filter and compressor.

The following factors affect the choice of a pattern. Jain Allied Publishers Private Limited. Since only kinetic energy of abrasive grits is utilized for erosion, the analytical formula for MRR can be machinint by equating available kinetic energy with the work done required for creating an indentation of certain cord length on a specific work material. Abrasive blasting Industrial processes Machining.

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It compresses the carrier gas to a pressure of 15 — 20bar. qjm

Abrasive jet machining

Disadvantages of 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. When an abrasive particle like Al2O3 or SiC having sharp edges hits a brittle and fragile material with a high speed, it makes dent into the material and lodges a small particle from it by a tiny brittle fracture. List of factors that affect abrasive jet machining performance.

Various components of AJM set-up and their functions. What is the basic ajn of material removal in AJM? Larger grits can again create trouble machininy mixing and flowing through the pipeline. As flow rate and compressor delivery pressure are constant, jet velocity will be inversely proportional to the jet cross-sectional area. MRR can be enhanced by proportionally increasing both the abrasive flow rate and gas flow rate at same rate so that mixing ratio remains constant.