press operation ketan patel unjha
TRANSCRIPT
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There are twelve types of press operation:-
(1) Blanking (7) Slitting
(2) Punching (8) Lancing
(3) notching (9) Nibbling
(4) Perforating (10) Bending
(5) Trimming (11) Drawing(6) Shaving (12) squeezing
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Blanking is the operation ofcutting a flat shape from sheetmetal. the article punched out
is called the blank "and is therequired product of theoperation.
The hole and metal left behind
is discarded as waste.It isusually the first step of series ofoperations.
Fig:-1.1 Blanking
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It is a cutting operation bywhich various shaped holesare made in sheet metal.
Punching is similar toblanking except that inpunching, the hole is thedesired product, the material
punched out to form the holebeing waste.
ig:-1.2 Punching
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This is a cuttingoperation by
which metalpieces are cutfrom the edge of a
sheet, strip orblank.
Fig:-1.3 otching
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This is a process bywhich multiple holes
which are very smalland close together arecut in flat work
material
Fig:-1.4 erforating
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This operation consistsof cutting unwanted
excess material fromthe periphery of apreviously formed
component.
ig:- 1.5 Trimming
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The edge of a blanked part aregenerally rough, uneven andunsquare.
Accurate dimensions of thepart are obtained byremoving a thin strip of ametal along the edges. This
operation is termed asshaving.
IG:-1.6 Shaving
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It refers to theoperation of making
incomplete holes in awork piece.
Fig:-1.7 slitting
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This is cutting operation in which a hole is partially cutand then one side is bent down to form a sort of tab orlouver. since no metal is actually removed ,there will be
no scrap.
Fig :-1.8 ancing
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The nibbling operation which isused for only small quantitiesof components, is designed for
cutting out flat parts from sheetmetal. The flat parts range fromsimple to complex counters.This operation is generally
substituted for blanking. Thepart is usually moved andguided by hand as thecontinuously operating punchcuts away at the edges of the
desired contour. Fig:-1.9 ibbling
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In this operation, thematerial in the form
of flat sheet or strip,is uniformly strainedaround a liner axiswhich lies in the
neutral plane andperpendicular to thelengthwise directionof the sheet or metal.
ig :-1.10 bending
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SQUEEZINGSQUEEZING
This is a process of a forming a flat work pieceinto a hollow shape by means of a punch whichcauses the blank to flow into a die cavity
Under this operation, the metal iscaused to flow to all portions of a diecavity under the action ofcompressive forces.
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A textbook of
production - by :- P.c Sharma
technology
images - by :- Google search
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T
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Y UO
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