What is the principle of Abrasive jet machining?

The fundamental principle of Abrasive jet machining involves the use of a high-speed stream of abrasive particles carried by a high-pressure gas or air on the work surface through a nozzle. The metal is removed due to erosion caused by the abrasive particles impacting the work surface at high speed.

What is Abrasive jet machining used for?

In the form of abrasive jet it is used for machining like cutting, drilling, and engraving of brittle materials. Surface fast cleaning and preparation are done by using abrasive jet for welding and plasma spray coatings. The erosion tests of turbine blades, propellers are done by using abrasive jet application.

Which gas is used in Abrasive jet machining?

In abrasive jet machining jet is produced by mixing the gas with abrasive particles. The gas used is called as carrier gas. Some of the most common carrier gases employed are air, carbon dioxide nitrogen. Oxygen is never used as a carrier gas as it may oxidize the surface of the work piece.

Which is not advantages of the Abrasive jet machining?

Not suitable for soft and ductile materials—If AJM is used for machining such materials, then hard abrasive grits tend to remain embedded on the machined surface and this hampers accuracy and surface quality. Read: Why AJM is not recommended for machining ductile materials?

What are the limitations of AJM?

Disadvantages of AJM:

  • AJM is suitable only for brittle materials as MRR is high for brittle materials.
  • Machining accuracy obtained is poor. …
  • MRR is low i.e. up to 0.05cm2 /hr.
  • There is always a chance of abrasive particles getting inserted in the work materials hence cleaning needs to be done after machining.

Why are abrasive particles not reused in AJM?

Reason-2: Loose of cutting ability After the first impact, abrasive particles lose its sharpness. Sharpness is one of the desired properties of abrasive particles as it helps easy and efficient cutting (eroding). So reuse of abrasive particles may result low material removal rate (MRR) and poor surface quality.

What are the advantage and disadvantages of abrasive jet machine?

The process is free from chatter and vibration as there is no contact between the tool (nozzle) and work material. Do not cause hardening of workpiece material. Very little or no heat generation during the cutting process, so it is suited for machining of heat sensitive material.

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Which type of materials can be machined using abrasive jet machining?

Explanation: Materials like ceramics, glass, hard and super hard materials can be machined using Abrasive jet machining.

Which abrasive is used in abrasive jet machining?

) Silicon carbide (SiC) Glass beads, crushed glass and sodium bicarbonate are some of abrasives used in AJM. Selection of abrasives depends on MRR , type of work material , machining accuracy.

What are the materials used for abrasives in abrasive water jet machining?

Different types of abrasives are used in abrasive water-jet machining like garnet, aluminum oxide, olivine, silica sand, silicon carbide, etc.

What are the advantages and disadvantages of using abrasive?

Advantages & disadvantages of wet abrasive blasting methods

Advantages Disadvantages
Vapour abrasive blasters High cleaning rates Reduce dust Low water consumption Low abrasive consumption Fine air pressure & abrasive control Appropriate for different applications Higher purchase cost

Why abrasive machining is not suitable for soft materials?

While machining ductile materials by AJM, the hard abrasive grits may get embedded on the soft machined surface. … While cutting deep slots or holes, these embedded abrasives can restrict further erosion and thus degrading trend in material removal rate (MRR) is observed.

What are the applications of USM?

USM is most commonly used to machining of glass, ceramics, zirconia, precious stones, and hardened steels. USM allows the cutting of complex and non-uniform shape with extremely high precision. So it is used in optical and electrical application where more precise and quality cutting is required.

What are the advantages of AJM?

The main advantages are its flexibility, low heat production, and ability to machine hard and brittle materials. Its flexibility owes from its ability to use hoses to transport the gas and abrasive to any part of the workpiece. Normallly inaccessible portion can be machined with good accuracy.

What are the advantages of USM?

The advantages of Ultrasonic Machining are:

  • This process is used for drilling both circular and non-circular holes in very hard materials like carbide, ceramics, etc.
  • This process is best suited for brittle materials.
  • The machining operation is simple and requires less time.
  • This process is economical.
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What is the principle of USM?

Ultrasonic Machining (USM) Principles. Working principle of Ultrasonic Machining or Ultrasonic Impact Grinding is described with the help of a schematic diagram. The shaped tool under the actions of mechanical vibration causes the abrasive particles dipped in slurry to be hammered on the stationary workpiece.

Which type of materials Cannot be machined using abrasive jet machining?

Which type of materials cannot be machined using Abrasive jet machining? Explanation: Soft materials such as candy bars, thin softwood etc.., cannot be machined using AJM.

Which machining is applied on metals with abrasive particles must be added to jet stream?

AWJM combines abrasive jet machining with water jet machining (WJM) to create a unique process which overcomes their individual limitations and enhances the machining capabilities of WJM for cutting, drilling, and general cleaning of hard and/or strong materials.

What are the abrasives used in AJM?

In AJM, a focused steam of abrasive particles carried by high pressure gas is used. Uniform particles of sand, steel grit, copper slag, walnut shells, and powdered abrasives are used. Silicon carbide, aluminium oxide, glass beads, dolomite, sodium bicarbonate are used as abrasives.

What are the main process elements of Abrasive Flow Machining?

The key components of AFM process are the machine, tooling and abrasive medium. Process input parameters such as extrusion pressure, number of cycles, grit composition and type, tooling and fixture designs have impact on AFM output responses (such as surface finish and material removal).

What are the abrasives used in USM?

The abrasives used for the USM process include diamond, cubic boron nitride, boron carbide, silicon carbide, and aluminum oxide. Boron carbide is the most widely used abrasive material.

Which of the following processes Cannot be machined using magnetic abrasive finishing?

Explanation: Holes drilling is one of the processes that cannot be done using Magnetic Abrasive Finishing.

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Which of the following materials are used as abrasive grains?

Q. In AJM, which of the following materials are used as abrasive grains?
C. glass beads
D. all of the mentioned
Answer» d. all of the mentioned
Explanation: in abrasive jet machining, any of the particles mentioned above can be used as abrasive grains.

What is abrasive jet speed in abrasive jet machining AJM?

During abrasive jet machining process, material from a surface of workpiece is removed due to impact erosive action of fine-grained abrasive particles impacting at high velocity (200–400 m/s). … To attain this high velocity, the abrasive particles are driven through a nozzle with compressed carrier gas, usually air.

What are the components of abrasive jet machining AJM )?

Components in AJM set-up and their functions

  • Air compressor. Usually air is sucked directly from atmosphere, it is first dried and made dust free and then compressed to high pressure. …
  • FRL unit. …
  • Pressure regulator and flow valve. …
  • Abrasive feeder and mixing chamber. …
  • Nozzle. …
  • Working chamber. …
  • Modern accessories and controlling.

What are the abrasive particles used in AFF process?

Medium used to carry out AFF experiments consists of Soft styrene butadiene polymer base, having abrasive concentration of 66.67 wt%, abrasive mesh size is 220 for different values of extrusion pressure, and weight percentage of plasticizer content.

What is abrasive slurry?

The abrasive slurry is a mixture of abrasive material (e.g. silicon carbide and boron carbide) suspended in water or oil. The vibration causes the abrasive particles in the slurry between the tool and the workpiece to impact the workpiece surface, causing material removal by micro-chipping.

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