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This article describes the applications, process capabilities, and limitations and advantages of electrostream and capillary drilling. It describes equipment and. NPTEL provides E-learning through online Web and Video courses various streams. Book Source: Digital Library of India Item : Sridhar ioned.

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A flow rate of cm? I am extremely thankful to the staff of central glass blowing people for their help in fabricating the glass nozzle. Electrolyte HCl Experiments were conducted using hydro chloric acid [HCl at different con- centrations.

An acidic electrolyte, however, dissolves the metal, and drillinng away as metal ions Fig 1.

Electrostream Drilling Of High Speed Steel

One such problem is drilling small deep holes in the super alloys. With the above conversion the experiments are conducted in the random order according to the plan given in Table 2.

New York American Elsavier publishing company, Schematic showing the deepest depth profile 24 2. Shaped tube electrolytic machining is a specialized ECM technique for drilling small, deep holes utilizing acid electrolytes. It is evident from the figure that the material removal incrca. This aspect reduces the resistance to current flow and may help in improving process performance.

Out of which 5 experiments are conducted under electrosrteam same operating conditions. Test conditions Figure 2. Traditionally shaping of components by selective removal of material has been performed by mechanically operated tools, the inherent principle being that a hard material will cut a softer one.


Block diagram of the experimental system of study The arrows on the right show the numerical characteristic of the goals of inves- tigation deilling they are called responses yields. This is done before taking weight of the work piece after ESD.

Initially the pump is switched on and electrolyte supply is ensured. They concluded electrostrea, the spike eledtrostream is largely governed by the feed rate, hole diameter, and taper angle. This increase in current causes more luateritd removal. Block diagram of the experimental system of study is shown in Fig 2. According to the plan 13 experiments are conducted.

The design of experiment is the procedure of selecting the number of trials and conditions for running them, essential and sufficient for solving a prob- lem that has been set with the required precision.

Sreejith et al [3] reported experimental findings concerning the effects of pro- cess parameters on the profile of a spike obtained during electro-chemical drilling of a blind hole in HSS workpiece.

To obtain the idea of interac- tions and elcetrostream order effects, second order designs are preferred.

Then the workpiece is dried under an electric bulb to completely remove any Icft-out traces of liquid from the machined blind hole. In the present system a plastic tank of 25 liters elsctrostream ity was made as a reservoir Pump A pump is required to force the electrolyte from the reservoir into the machin- ing zone.

Suggestions for the application of metal removal as a metal working technique were proposed by W. During the course of study an attempt has been made drillihg evaluate the effect of process parameters i.


Electrostream and Capillary Drilling | Machining | Books Gateway | ASM International

Hast alloy, Heynes alloy. The weight of the samples drillibg and after machining is recorded. After 30 min, the pump is switched off. Problems such as tool wear and excessive heat generation at the tool and workpiece interface are encountered while employing conventional mechanical drilling techniques.

The profiles are then traced on a transparency role. The study conducted has shown that the ESD process is feasible and electrostreaj tageous in machining small diameter hole drilling in HSS and Inconel. Some of the test conditions used during the experimentation are given in Table 2.

After machining, the workpieces are parted off by removing the solder. They suggested guidelines for selecting a particular process. He found that the use of tool bits in drilling operation can re- sult into a substantial reduction in power consumption and overcut.

Tool bits with insulated sides and low operating voltages lead to practically zero over cut. electrostgeam

The results of their study are shown in Fig 1. The effect of applied voltage on spike volume was not significant. List of Tables 1. As a result more machining current will flow to the machining zone.

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