What is magnetorheological Abrasive Flow Finishing?
A new precision finishing process called magnetorheological abrasive flow finishing (MRAFF), which is basically a combination of abrasive flow machining (AFM) and magnetorheological finishing (MRF), has been developed for nano-finishing of parts even with complicated geometry for a wide range of industrial applications …
What is Abrasive Flow finishing process?
Abrasive flow finishing (AFF) is a non-traditional advanced fine finishing process using an abrasive-laden viscoelastic polymer for finishing, polishing, deburring, radiusing of the component having a complex geometrical shape with inaccessible areas and difficult to machine materials.
What is magnetorheological finishing MRF give suitable examples?
Magnetorheological finishing (MRF) is a precision surface finishing technology. Optical surfaces are polished in a computer-controlled magnetorheological (MR) finishing slurry. Unlike conventional rigid lap polishing, the MR fluid’s shape and stiffness can be magnetically manipulated and controlled in real time.
What is Magneto Abrasive Flow Machining?
Magnetic abrasive flow machining (MAFM) is a non-conventional machining process and was developed in early 2000s as a method to deburr, clean and radius hard to reach surfaces such as complicated geometries by flowing the media through or over them.
What is magnetic float polishing?
Magnetic float polishing (MFP) is a technique that was developed as an alternate method for finishing ceramic balls. This method shows much higher material removal rates, anywhere from 50 to 100 times higher, so a batch of balls can be finished in much shorter amount of time.
What are the process parameters of Abrasive Flow Machining?
The optimum abrasive grain size utilized in this AFM is found to be related to the minimum standoff distance between tool bar and workpiece during finishing process. The obtained optimum tool bar rotating speed, traverse speed, and number of processing cycles are 19,200 r/min, 500 mm/min, and 500 cycles, respectively.
What is the working principle of Abrasive Flow 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 are the various abrasive machining operations?
11.1 Abrasive machining uses hard non-metallic particles to cut the workpiece. Processes within this group include grinding, honing, super-finishing and lapping. The first three use abrasive particles (often called grits), rigidly held in a wheel or stone, whereas in lapping the particles are contained in a fluid.
Which of the following are the characteristics of media used in Abrasive Flow Machining?
The Abrasive Flow Machining / Extrude Honing AFM process is ideal for polishing and deburring, especially for complex internal shapes.
- Media flow rate.
- Viscosity.
- Abrasive particle size.
- Abrasive concentration.
- Particle density.
- Particle hardness.
- Workpiece hardness.
How do the operating parameters affect the machining process in Abrasive jet machining process?
Process Parameters of Abrasive Jet machining (AJM) are factors that influence its Metal Removal Rate (MRR)….The following are some of the important process parameters of abrasive jet machining:
- Abrasive mass flow rate.
- Nozzle tip distance.
- Gas Pressure.
- Velocity of abrasive particles.
- Mixing ratio.
- Abrasive grain size.
What are the components of magnetorheological fluid?
Magnetorheological fluids comprise three main components: magnetic particles, carrier fluid, and additives. Magnetic particles used are often carbonyl iron of 99% purity because carbonyl iron particles have a high magnetic permeability and high saturation magnetization (Ashtiani et al., 2015a).
How do magnetorheological fluids work?
An MR fluid consists of a mixture of oil (usually a silicon oil) and micro-particles sensitive to the magnetic field (e.g. iron particles). The MR fluid behaves as a liquid when no field is applied. In the case of a magnetic field applied to the fluid, the particles form chains and the fluid becomes very viscous.
What are the process parameters of Abrasive jet machining?
The following are some of the important process parameters of abrasive jet machining:
- Abrasive mass flow rate.
- Nozzle tip distance.
- Gas Pressure.
- Velocity of abrasive particles.
- Mixing ratio.
- Abrasive grain size.
What are the main process elements of abrasive Flow machining?
Major components of the abrasive flow machine include machine itself, tooling and abrasive medium [1]. The material removal mechanism includes three deformation modes– elastic deformation, plastic deformation or plouging and micro cutting of material.
Why abrasive machining is preferred for finishing process?
Not only is abrasive machining more precise than large-chip processes (size tolerances within 0.001″ or 0.025 mm and form tolerances to within 0.0005″ or 0.0127 mm), it also produces a significantly better surface finish. An added bonus is that there is little to no burr generated.
What are the important factors to be considered while selecting the abrasive material in abrasive water jet machining?
Abrasive flow rate—It is also another important factor as MRR is proportional to the mass flow rate of abrasive. Stand-off distance (SOD)—With increase in SOD, jet diameter also increases because of spreading. Impingement angle—It is the operating angle between work surface and jet diameter.
Who invented magnetorheological fluid?
Jacob Rabinow
Jacob Rabinow is credited with discovering MR fluid in the 1940s while working at the U.S. National Bureau of Standards (now the National Institute of Standards and Technology). Until about 1990, there were few applications for MR fluid because there was no way to properly control it.