design and fabrication of drilling jig for flange report
#1

design and fabrication of pneumatic auto feed drilling machiner eport

abstract


in small-scale industries and automobile maintenance shops, there are frequent needs of
tightening and loosening of screws, drilling, boring, grinding machine. huge and complicated
designed parts cannot be machined with the help of an ordinary machine and further for every
operation separate machine is required therefore increasing the number of machines required and
increasing the area required for them to be accommodated and hence overall initial cost required
is increased.
in a single machine all the above specified operation can be carried out, i.e., after drilling,
the drill head is removed from the barrel key and the required tools like grinding wheels, boring
tool etc., can be attached, and the operation can be performed.
by the application of pneumatics, the pneumatic cylinder with piston which is operated
by an air compressor will give the successive action to operate this machine. by this we can
achieve our industrial requirements.


Introduction to Flange Coupling

A flange coupling is a rigid assembly used to connect rotating shafts. The shape and configuration of the flange coupling may vary but the principle remains the same.
Flange couplings transmit power and torque in one of two ways.
1. Mechanically, with the use of spigots, dowel pins, special toothed systems, or fitted bolts loaded in shear.
2. Friction, due to the pressure between the mating surfaces of the flanges. The pressure is generated by the clamping force provided by bolts.
Flange couplings are used throughout industry. Typical applications include coupling shafts in power transmission systems, gearboxes and automotive drive trains.
Friction drive couplings are less costly to produce, and when correctly specified provide an extremely reliable assembly. They are therefore the most common form of coupling used. The load capacity of such conventional flange couplings is a function of the clamping force, friction between the parts and the flange dimensions.



Traditional Coupling Design


For an unbonded bolted flange coupling the static torque capacity before slippage occurs is proportional to:
• The number of bolts
• The clamping force provided by each bolt
• The coefficient of friction between the two mating surfaces
• The dimensions and stiffness of the flanges
Failure for this type of coupling occurs when relative rotational slip occurs between the two flanges. Couplings are normally manufactured so that the bolts are a clearance fit in the holes to ensure they are not loaded in shear (unless rotational slip occurs).



Checking the coupling balance

Couplings are normally balanced at the factory prior to being shipped, but they occasionally go out of balance in operation. Balancing can be difficult and expensive, and is normally done only when operating tolerances are such that the effort and the expense are justified. The amount of coupling unbalance that can be tolerated by any system is dictated by the characteristics of the specific connected machines and can be determined by detailed analysis or experience.

Reference: http://studentbank.in/report-flange-coup...z4EpC7gTtn
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