Posted tagged ‘Technical’

And The Phrase” The Sun Is On…!” Hurts..!

August 23, 2011
It is the day that i have awaited more than My 20th B’day. Ofcourse i dint worked that hard to deserve anything!
TORQUE_ A Technical Orchid……..Quest for Excellence is the event that i have wauted for.!The last event in the year 2011 in UCE…!
Initial hiccups couldn’t deter the determined organizers from conducting the event.!With a modest support from the department and a meagre amount of Rs.20,000/- funds!
I still wonder how these guys had managed such an event to fare far better than other events in University!
The very first day saw many fresh faces in department…
Enormous inflow of new waters flooded into old still waters.
With a big question mak on my face i continued to wonder ” Will it be a success..?”
There isn’t even a single instant from which i could learn nothing right from the startig of inagural function to the last word of Thanks gving speech of Valedictory!
Its alwaz irritating to sit in an audi hearing to some blah blah…of eminent speakers with all doors either closed or guarded by some self proclaimed coordinators.!
Somehow they got crowd for that Inagural!
I have managed to escape to stalls.!
I was participating in every torque…
This is my 3rd Torque and 3rd time i have been in stall!
When i was in 1st yr we dint celebrated even though we got some profits….!!
But as the time gre my mind started transforming and i found that celebration of every possible ocassion will be the essence of Engineering life.!
3 different teams in 3 Torques!
Ofcourse i(We) have started celebrating in 2nd yr!
The cricket fever which was feared of was perfectly battled!
Achievable target and dogged performance from Men In Blue and of course some luck of Mr.Cool MSD could have costed us dearly.!
But thanks to performers who kept the audience to glue to their chairs.!
U happened to be computer operator for that day’s culturals ” ROCK ON”
Very close to stage!
I Torque-10 It was ” MY Love Is Gone”
And In Torque-11 It was MJ’s ” DANGEROUS”
Everyone is going crazy of MJ these days….
I feel that MJ fever is still on even though MJ Departed.!
And the thing i came to know
and which has adrenalized my thoughts of organising a whole college event is That JNTU is under transformation!
I’m in the university since 3 yrs…
But i haven’t spotted A Jr Anchoring an Event…
Thanks to all enthusiastic jrs….
I expect their cooperation for whole college Techno-Cultural Fest!
And the other thing is A Boy and Girl from same class dancing together on same stage…!!
A welcomed sign for a world class university!
And the good news came by air in the midst of celebration that Men In Blue had edged Kangaroo’s out of CWC-11
Thunderous applause to MIB rocked the Whole university campus…!
Finally the show halted at 1:00 am
for the next few hours i have slept and when i woke up i found the Sun is Just on….
Another day of surprises is waiting!

CASTING

August 23, 2011

Methods are:

    1. Pressing
    2. Centrifugal Casting
    3. Slip Casting
    4. Extruding
    5. Gravity Casting
    6. Rolling
    7. Iso-static Moulding
    8. Explosive Compacting
    9. Fibre Metal processes

Pressing:

The function principles of the mechanic press machines differ in how to ensure the upper punch main movement by cams, spindles and friction drives, eccentric, knuckle-joints or by the round table principle, independent if the die or lower punch movement is realized by cams  or eccentric systems or other mechanically or hydraulically combined systems. The executions of auxiliary movements are also not decisive for a term-classification. These auxiliary movements can also base on pneumatic and hydraulic principles. In comparison to hydraulic press machines the maximum compaction forces of mechanical powder presses are limited and are placed in the range </= 5000 kN. For the requirements of wet and dry pressing techniques in the field of Technical Ceramics cams, eccentric, knuckle joint as well as round table presses have proved and tested, whereas cam presses especially used for wet-press-techniques of pourable materials. The range of compaction force of mechanical presses for products of the Technical Ceramics is < 2500 kN, what is caused from the less density of the ceramic materials. Normally the upper punch, lower punch and die systems of mechanical presses don’t work on base of multi subdivided punches.

01-powder pressing-metallurgy

Centrifugal Casting:

It employed for compacting heavy metal powders such as Tungsten Carbide. The powder is twirled in a mould and packed uniformly with pressures up to 3 MPa. The uniform density is obtained as a result of centrifugal force, acting on each particle of powder.

06-centrifugal-casting-process

05-centrifugal-casting-mold-metal-parts

Slip Casting:


Green compact of metal powder may be obtained by slip casting. The slurry, consisting of metal powder is poured in to porous mould. the free liquid in a slurry is absorbed by the mould tearing the solid layer of material on the surface of mould. The mould may be vibrated to increase the density of component. The Components are dried and sintered to provide sufficient strength.

07-slip casting-process-powder metallurgy

Extruding:

It employed to produce the components with high density and excellent mechanical properties.

Both hot and cold extrusion processes are used for compacting special materials. In cold extrusion the powder is mixed with binder and the mixture is often compressed into billet before being extruded. The binder must be removed before or during sintering. In hot extrusion the powder is compacted in to billet and is then heated to extruding temperature in non oxidizing atmosphere.

04-extrusion-direct-indirect-rod-pipe-process

Gravity Casting:

It used for making sheets having controlled porosity, the powder is poured on a ceramic tray to form a uniform layer and then sintered up to 48 hrs in Ammonia Gas at high temperature. The sheets are then rolled to desired thickness and to obtain a better surface finish. Porous sheets of stainless steel, made by this process are used for filters.

09-gravity-casting-metal-mould

10-indirect-gravity-casting-metal-mould

Rolling:

It employed for making continuous strips and rods having controlled porosity with uniform mechanical properties. In this method the metal powder is feed in to two rolls, which compress and interlock the powder particles to form a sheet of sufficient strength. It is then sintered, re-rolled and heat treated if necessary. Metal powders which can be compacted in to strips include Copper, Brass, Bronze, Nickel, Monel and Stainless Steel.

08-cold-rolling-process-plate-sheet-foil

Iso Static Moulding:

It used to obtain the products having uniform density and uniform strength in all directions. metal powder is placed in elastic mould (Deformable Mould) which is subjected to Gas pressure (65 to 650 MPa). After pressing the compact is removed.

02-cold-iso-static-pressing-compacting

Explosive Compacting:

It employed for pressing hard particles. The metal powder are placed in water proof bags which are immersed in water. It contained in a cylinder having wall thickness. Due to sudden deformation of change at the end of cylinder the pressure in the cylinder increases. The pressure used to press the metal powders to form green compact.

11-explosive-moulding-compacting

Fibre Metal Processes:

In this process, the metal fibers (Fine wires of Convenient length) are mixed with a liquid slurry and poured over a porous bottom. The liquid is drawed off leaving the green mat of fibre. The mat in which the fibers are randomly distributed is pressed and sintered. The products are mainly used for Filters, Battery Plates and Damping’s.

 12-fibre-metal-processes