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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To obtain eelectrostream idea of interac- tions and higher order effects, second order designs are preferred. It is evident from the fig 1. Several other situations that favour the application of these advanced machining processes AMPs for drilling are: Two HSS tool bits of 5.

As these metals possesses good acid resistant properties and good electrical conductivity. This problem occured quite often and at this point contin- uous arcing was observed. This aspect led to the development of high strength and temperature resistant, hard and brittle materials, whose machining posed serious problems to the manufacturing industries.

The magnitude of stray current will be more at higher voltage which leads to more widening of the lop surface diameter of the hole.

The combind head due to gravity and pump resulted in flowrate drioling than theoritical value i. The method shows advantages over other hole making techniques in terms of the resulting surface quality and process reliability. Asymmetry is observed in opposite faces of hole profiles, this may be due location of hole center not exactly along the parting line; Polarity is reversed for a short period of time as a result the deposit is removed and electrolyte flow is restored.

High speed steel HSS This is also called tool steel. Reproducibility plot 36 ESD drilled holes have deilling.


Electrostream Drilling Of High Speed Steel

S, after machining is covered a thick, tenacious black film. Test conditions Drikling 2. Chryssoluris and Wollowitz [4] developed an electro chemi- cal hole making technique which uses uninsulated tools and passivating XaClOz electrolytes.

Such quadratic type of designs are used when responses are not expected to be linear and the de- sign is needed to yield estimates of the curvature aspects drllling each response.

The ESD machine drulling been designed keeping in view of the fundamental mechanism of the process. With ESD holes as small as 0. Ti and electrolyte concentration 2: The reason for an increase in diameter of the hole at the top surface is partly attributed to the stray current effect and partly due to the fact that this portion of the workpiece is subjected to electro-chemical dissolution throughout the period of drilling. Sridhar Sastry Abstract Advances in the field of aerospace, gas turbine, nuclear technologies have pro- duced the need to machine the super alloys and refractory metals.

But drilling of small holes with large aspect ratios is electrostraem the scope of ECM because of over cutting ekectrostream account of sideway current flow.

Work table Both are made up of perspex, as perspex is acid resistant material and it possess good electrical insulating properties. The acidic electrolytes used in ESD dissolves the precipitates thereby avoiding sludge formation during drilling.

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This aspect helps in easy ad- justments, and improves flexibility of the system. A platinum wire inserted in the nozzle acts as cathode.

Geometrical aspects such as machined hole profile, hole taper have also been studied. At the bottom of the hole due to large gap, the current density drillnig decrease, with the result that comparatively lower overcut low mix takes place and hence the profile gets twisted towards the center.


It is seen from the figure that correlation between theoretical and experimental results is quite good. EDM and LBM are ther- mal drillling and therefore cause the formation of heat alfected zones and micro cracks on the work surface, resulting in metallurgical damage of the workpiece surface material.

The chamber is provided with an outlet at the bottom to facilitate used elec- trolyte disposal. Out of which 5 experiments are conducted under the same operating conditions. The figure shows that the machined holes have conical profile i. The chamber is provided with a detachable top cover plate for making ad- justments electrostrsam the top whenever necessary.

Full text of “Electrostream Drilling Of High Speed Steel”

For conducting experiments at different electrolyte concentrations, the same proce- dure is repeated with a freshly prepared electrolyte. Gussef, a Russian scientist, in and much latter by C. So the system is made leak proof. It retains high hardness while cutting metal at very high speeds. Ltd Piping The pipes carrying the electrolyte must be acid resistant.

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. The work piece can be given horizontal feed manually, so that a hole can be drilled in a new position. Geometrical parameters such as taper angle of the holes ai’e presented.