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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It consists of gas supply system compressorfilter, pressure regulator, mixing chamber, nozzle assembly and the work ,achining device. The mixing ratio is generally controlled by a vibrator.
Different Types of Welding Defects. If you continue to use this site we will assume that you are happy with it. Such abrasives must possess few basic properties for efficient removal of material as well as to get desired quality of cut.
Abrasive jet machining – Wikipedia
The gas passes through a convergent-divergent nozzle before entering the mixing chamber, machininng then exits through a convergent nozzle. Compare various types of abrasives used in AJM process.
Metal removal rate is low In certain circumstances, abrasive particles might settle over the workpiece. The contents of this article are listed below: Mishra Narosa Publishing House. As discussed earlier, shape, size, strength, material and flow ,achining of abrasive can influence machining performance. One of the main disadvantages is its slow material removal rate; for this reason it is usually used as a finishing process.
Work surface cleaning —AJM can be advantageously used for cleaning metallic or ceramic surfaces substrate must be hard. This page was last edited on 16 Decemberat Process Parameters of Abrasive Jet Machining.
Labels Automobile Engineering 24 Biomass mqchining Boiling heat transfer 7 energy machinng energy sources 27 engineering materials. Formulas for MRR in abrasive jet machining process. First it compresses the gas and then mixes it with the abrasive in a mixing chamber. Enter your email address: A vibrator is used to control the feed of the abrasive powder. Abrasive jet machining can be advantageously utilized for multifarious purposes including surface cleaning, deburring, abrading and even making holes.
Abrasive Jet Machining (AJM) Process Advantages and Disadvantages – Mechanical Engineering
Nontraditional Manufacturing Processes by G. Nozzle life is less. It is evident that the SOD changes the abrasive particles spreads i. Why different abrasives produce different MRR? Nozzle also directs high velocity jet towards work surface from a machininf distance called SOD and at a particular predefined angle, called impingement angle. It can be utilized for cutting, drilling, polishing, deburring, cleaning etc.
Abrasive Jet Machining – Process, Parameters, Equipment, MRR
Here momentum transfer takes place and abrasives start flowing with carrier gas. Finnie ; Some observations on the erosion of ductile metals; Wear; Vol. Nozzles must be highly resistant to abrasion and are typically made of tungsten carbide or synthetic sapphire. Before compressing, carrier gas is dehumidified properly as presence of steam can block pipelines.
Abrasive jet machining
This process is quite suitable for machining brittle, heat resistant and fragile materials like, glass, ceramic, germanium, mica etc. They are used to control the pressure and regulate the flow rate of abrasive jet.
Abrasive Jet Machining cannot be used to machine soft materials. Effects of carrier gas on AJM performance Carrier gas pressure and its flow rate are two paramount factors that determine performance and machining capability. Moreover, increased gas flow rate gives the provision for utilizing higher abrasive flow rate, which can improve productivity. Another disadvantage is that the process produces a tapered cut. In the mixing chamber, the abrasive is allowed to flow into the gas stream.
For the process that uses water as a carrier, see Water jet cutter. However, holes, slots or pockets may lack accuracy as sharp corners cannot be obtained by this process.
This process is best suited for machining super machininv and refractory type of materials, and also machining thin sections of hard materials and making intricate hard holes. There are some allowances which are responsible for the difference in the dimensions of the casting and the pattern The surface machined can have good finish by controlling the grain size mainly.
However, variation in size in the nachining volume should be low otherwise estimation or assessment will not be accurate. Carrier ahm for abrasive jet machining Basic purpose of carrier gas in abrasive jet machining is to accelerate fine abrasive particles by momentum transfer.