The Process of Material Removal Rate Governed by Faraday's Law - Abrasive Jet Machining

Introduction:
Abrasive jet machining (AJM) is a non-traditional machining process that uses a high-velocity stream of abrasive particles to remove material from the workpiece. It is a versatile and effective method for machining hard and brittle materials. The material removal rate (MRR) in AJM is governed by Faraday's law, which relates the amount of material removed to the electric current passing through the machining gap.

Faraday's Law:
Faraday's law of electrolysis states that the amount of material removed or deposited during an electrolytic process is directly proportional to the quantity of electricity passed through the electrolyte. In AJM, the abrasive particles are entrained in a high-velocity carrier gas (usually air or nitrogen) and directed towards the workpiece. The abrasive particles strike the workpiece surface and cause material removal through erosion.

Explanation:
The MRR in AJM is directly proportional to the quantity of abrasive particles impacting the workpiece surface. The quantity of abrasive particles depends on the flow rate of the carrier gas and the concentration of abrasive particles in the gas stream. In AJM, the carrier gas is ionized to increase its electrical conductivity. An electric potential is applied between the nozzle and the workpiece, creating a plasma channel.

When the plasma channel is formed, the flow of electric current through the machining gap causes electrochemical reactions at the workpiece surface. These reactions result in the loosening and removal of material from the workpiece. The material removal mechanism in AJM involves both mechanical erosion due to abrasive particles and electrochemical dissolution due to the flow of electric current.

The MRR in AJM is directly proportional to the current passing through the machining gap, as governed by Faraday's law. The higher the current, the greater the electrochemical dissolution and material removal. However, there is also a limit to the current that can be passed through the machining gap, as excessive current can cause thermal damage to the workpiece.

Conclusion:
In summary, the process in which the material removal rate is governed by Faraday's law is abrasive jet machining (AJM). AJM utilizes the principles of electrolysis to remove material from the workpiece surface. The MRR in AJM is directly proportional to the current passing through the machining gap, as described by Faraday's law of electrolysis. By controlling the current and other process parameters, the material removal rate in AJM can be optimized for various applications.