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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Metal removal rate is low In certain circumstances, abrasive particles might settle over the workpiece. A close working chamber, inbuilt with proper exhaust system, is usually maintained in order to avoid environmental pollution. Most commonly, aluminium oxide or silicon carbide particles are used.
Written by Surjeet Sankararaj I am a mechanical engineer with jjet passion for technical stuff. It is provided below the mixing chamber. Gas used is carbon-di-oxide or nitrogen or compressed air.
The cutting action is cool because the carrier gas serves as coolant. 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 diameter; and v work material—its mechanical properties and stress concentration. List of factors that affect abrasive jet machining performance.
Mixing ratio can be increased by machinijg abrasive percentage abtasive in such case an increasing trend in MRR can be noticed because larger number of abrasives participates in micro-cutting action per unit time. Process of removal of burrs from machined surface is known as machininb. Abrasive jet machining AJM is one of the modern machining processes where high velocity jet of abrasives mixed with dehumidified pressurized gas is made to impinge the work surface, which in turn removes material by mechanical erosion.
There are many factors that can influence abrasive jet machining performance. However, if work material is too soft, AJM should be avoided. Abrasive jet machining AJM is one of the advanced machining processes mechanical energy based anrasive a high velocity jet of abrasives is utilized to remove material from work surface by impact erosion. 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.
Hopper is sometime vibrated machijing avoid bridging jamming at outlet. Unconventional Machining Processes by T. Common applications of abrasive jet machining process are provided below.
Moreover, increased gas flow rate gives the provision for utilizing higher abrasive flow rate, which can improve productivity. The lodged out or wear particle is carried away by the air or gas. Abrasive jet machining AJM is one of the efficient methods for deburring of milled features and drilled holes, especially when work material is hard.
Why AJM is not recommended for ductile materials? Process Parameters of Abrasive Jet Machining. Sometime commercially pure machinung di-oxide and nitrogen are also used to harness better performance for a particular purpose. Nozzle amj made of hard and resistant material like tungsten carbide.
AJM performance is abraasive 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)
Nonconventional Machining by P. I am a mechanical engineer with a passion for technical stuff.
Amj 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. In the mixing chamber, the abrasive is allowed to flow into the gas stream. Newer Post Older Post Home. Enter your email address: What is the basic mechanism of material removal in AJM? Every conventional tool-based machining process inherently produces burr.
Applications of Abrasive Jet Machining (AJM) Process
ApplicationsTexas Airsonics, archived from the original on March 4, Inner diameter of the nozzle is paramount parameter as it determines final velocity and cross-sectional area of the jet for certain gas pressure. Applications of abrasive jet machining AJM Work surface cleaning Although sand blasting or grit blasting is economical for this purpose, abrasive jet machining AJM can also be applied if tight quality of finished surface is desired.
Disadvantages of Abrasive Jet Machining: Carrier gas is also made dust free before compressing to high pressure. 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.
Abrasive Jet Machining AJMalso known as micro-abrasive blasting, is a mechanical energy based unconventional machining process used to remove unwanted material from a given workpiece. The pressure of this mixture is regulated and sent to nozzle. In such case, higher pressure of the carrier gas has to be utilized. I wanted to know about the movement of the nozzle using servos. Size of abrasives also influences quality of cut as well as material removal rate.
Carrier gas pressure along with nozzle diameter determines final jet velocity and thus machining performance. Views Read Edit View history. This necessitates thicker and stronger pipelines and other accessories to smoothly handle such high pressure without leakage and rupture.
AJM can also be used for various trimming applications in molding and forging. It forces the abrasive jet over the workpiece. Hopper is used for feeding the abrasive powder. Machininf nozzle can be hand held or mounted in a fixture for automatic operations. Advanced Machining Processes by V. Such cleaning processes include—.