FASTENERS
The subject of fastener is an important one because these components are applied so frequently and employed in such large quantity. although small they perform important function. In design of tool and dies, Fasteners are often the weakest link in the tool and, if they are not selected properly and applied correctly, they can become cause failure of the entire tool.
DIE FASTENERS:-
In this exploded view of typical die for producing blank from the strip, all fasteners have been shown removed from the components which they locates and hold. from this drawing it is apparent that fasteners ,all though small individually, from the substantial portion of the entire tool when taken together.
TYPES OF FASTNERS :-
These are the types of fasteners most commonly used in die construction. they are
• Socket cap screw
• Counter sunk screw
• Grub screw or set screw
• Eye bolt
• rivets
• Cotter pins
• Dowels
• Removable dowels
Less frequently employed type include the following:
Hexagon nuts, washers, studs , rivets and wood screw.
SOCKET CAP SCREW:-
These are generally used to fasten the plate elements of the press tool like punch holder assembly to the die top and die stripper assembly to the die sleeve.
COUNTER SUNK SCREW:-
These are used to fasten elements like nest gauges, spacers, plate stoppers etc.
GRUB SCREW OR SET SCREW:-
These are used to fasten parts which are to be confined within a hole, like springs etc.
EYE BOLTS:-
Eye bolts are used for lifting heavy die sets or mould housings. It is also called as carrier blots.
NON THREADED FASTENERS:-
This group includes the elements like rivets and cotter pins.
RIVETS:-
Rivets are generally used to fasten support plate of an extension table in press tool. They are made of MS, ALUMINIUM, COPPER OR BRASS
COTTER PIN:-
These are used to prevent the loose parts from coming out of holes.
DOWEL:-
Dowel holds parts in perfect related alignment by absorbing side pressure and lateral thrust. also, they facilitate quick disassembly of components and reassembly in there exact former relationship.
REMOVABLE DOWELS:-
One type of removable dowel is illustrated these dowel are used in blind application.
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