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when can the plate/sheet be turned into a product
once it has been rolled an extruded and sheared into a manageable length
stamping is the process
the varied processes that can be applied to sheet metal manipulation
some sheet metal products still? example ?
retain their original sheet appearance
metal roofing
the vast majority of stamped products becomes
discrete components with few remaining obvious flat area
example of products that become discrete components ? for this object?
hurricane - aka oil or kerosine lamp
the products doesn’t appear sheet-like because of its curvy and compact dimensions
sheet can be used thin because? the resulting product has
the folded nature of the design creates stiffness
high strength, because of the wrought aligned grains created during rolling
the product is strong but also
light weight and very inexpensive
stamping is very ? often considered first as a preferred manufacturing method
fast and energy efficient
stamping, although not suitable in all cases
punching is possible, assuming
that a product is to start as a piece of sheet metal, cut from a longer length via shearing
punching? is done by ?
where a hole (of any shape) is created in the sheet
the sheet is placed over a die and then a hole is generated by a descending punch
this process produces no
no fine metal chips or shaving, but rather a disc of metal called a blank (or slug)
the name of the process depends on
which part of the sheet metal is to be retained and which goes to waste
called punching if
the sheet with the hole is to be retained
called blanking
if the slug is retained and the sheet discarded
example of product that is both
plain or flat washer is both punched and blanked
for a washer the processes are performed ? the creation steps are ?
sequentially, the waste and product streams can be kept separated
first - small punch pushed out a waste slug from the sheet - creating a central hole in the washer
second - second punch blanks out a concentric circle around the hole
the blank piece falls away as the final product, leaving the sheet as the waste
perforating is? an example?
whe the punhcing is performed multiple times in a close proximity over a given area of sheet metal
to provide ventilation through a metal enclosure or to lighten a product or for decoration
perforaitng can involve
any size, shape or combination of holes, and doesn’t have to follow an ordered geometric pattern, although it often does
notching? can be associated with ?
another process for putting a hole (of any shape) through sheet metal - but it ALWAYS intersects the side of the sheet
bending operations where they provide corner relief
notches can be incorporated into a
blanking operation, but this can make the punch complex and result in dishing of the blank due to the uneven peripheral forces involved
seminotching
punching that becomes a notch(es) once a sheet is subsequently sheared
nibbling is the process? but it isnt a ?
related process that uses successive notches to cut out areas of sheet metal
a production process, but is performed in workshops or in the field during installation of ducting
results of nibbling
not attractive but its easier to do then to hand sew sheet metal - especially if the sheet metal is thin ad flimsy
a vertical bandsaw may be used ? an issue with it?
to do a cleaner job, but only if the metal is still a still a flat sheet and can be brought to the saw
the noise pollution