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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However, holes, slots or pockets cut by AJM may lack accuracy as sharp corners cannot be obtained by this process. Alternative energy, fluid mechanics, strength of materials, thermodynamics, heat transfer, Power plant, Patterns in castingRenewable energy and all the cool mechanical stuffs for students are discussed here. It can be utilized for cutting, drilling, polishing, deburring, cleaning etc.

It is used to mix the gas and abrasive particles. Hopper is used for feeding the abrasive powder. Very hard materials including glass, refractory, stone, etc. As discussed earlier, shape, size, strength, material and flow rate of abrasive can influence machining performance.

Abrasive-jet Machining (AJM)

The inside diameter ID of the nozzle through which abrasive particles flow is about 0. 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.

Various components of AJM set-up and their functions. Larger grits can again create trouble while mixing and flowing through the pipeline. For the process that uses water as a carrier, see Water jet cutter.

Equipment for abrasive jet machining Air compressor: Why AJM is not recommended for ductile materials? The surface machined can have good finish by controlling the grain size mainly. 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.

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The machinng particles may remain embedded in the work surface.

Carrier gas is also made dust free before compressing to high pressure. Since only kinetic energy of abrasive grits is utilized for erosion, the analytical formula for MRR can be established by equating available kinetic energy with the work done required for creating an indentation of certain cord length on a jer work material. 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.

Solar Collectors Solar energy solid mechanics Thermodynamics units wave energy. Common applications of abrasive jet machining process are abrasivw below. A properly designed casting, a properly prepared mould and correctly malted metal should result in a defect free casting. Abrasive jet machining can be applied for metal surface cleaning like removing oxide or corrosive layer from hard surface. This jet is used to remove unwanted material from the workpiece.

Compressed air is then passed into the mixing chamber.

Abrasive Jet Machining (AJM) «

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. Mishra Narosa Publishing House. Different Types of Welding Defects. The tapering of hole especially, when the depth of the hole is more, becomes almost inevitable.

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

In such case, higher pressure of the carrier gas has to be utilized. Category List Automobile Engineering Biomass Boiling heat transfer energy energy sources engineering materials. 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.

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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. Smooth surface finish can be obtained. Common uses include cutting heat-sensitive, brittle, thin, or hard materials. Different abrasives having a range of grit size can be utilized abrasuve on workpiece material and the operation it is intended to perform.

Retrieved from ” https: It is basically the relative machinimg between abrasives and workpiece that determines machining capability and productivity. One of the main disadvantages is its slow material removal rate; for this reason it is usually used as a finishing process. Abrasive materials have varying strength or hardness. The feed motion can be given either to the work holding device or to the nozzle. Abrasive blasting Industrial processes Machining.

The contents of this article are listed below: Carrier gas pressure and its flow rate are two paramount factors that determine performance and machining capability.

Carrier gas pressure along with nozzle diameter determines final jet velocity and thus machining performance. The particle and gas mixture comes out of the nozzle inside the machining chamber of the machine tool unit.

Compare various types of abrasives used in AJM process. This process is best suited for machining super alloys and refractory type of materials, and also machining thin sections of hard materials ket making intricate hard holes. Process capability of abrasive jet machining Materials: