sheet metal deep drawn technology is one of the most
challenging process in manufacturing. The sizes, shapes, thickness
and deep drawn metal used to produces sheet metal deep drawn
parts cover a diverse range of variables. Individual variables
should be evaluated carefully to determine the optimum manufacturing
of the many factors involved affecting the draw quality, the
most important element to a successful sheet metal deep drawing
operation is the smoothness of sheet metal flow. The following
are key elements affecting metal flow during deep drawing
process and each of them should be considered when designing
or troubleshooting sheet metal deep drawing stamping tools:
of material used and its thickness. = In deep drawing
process, thicker materials are stiffer, they can be gripped
better during deep drawing. Thicker materials also have more
volume, so they can stretch longer distances during deep drawing
process ( deeper draw ).
surface finish & type of Lubricant used = Die surface
finishes and lubricants are important to reduces the friction
between tool surfaces and metal been drawn,
materials to flow through tools more easily. Die temperatures
can affect the viscosity of lubricants. Slower deep drawing
speed gives better metal flow.
size and shape = Blank sizes and shapes that are too large
can restrict metal flow, and the geometry of parts affects
the ability of metal to flow during deep drawing process.
speed = sufficient punching speed allows time for materials
to flow through the tool. Corner cracking will always occur
if press speed is tool fast in deep drawing process.
radii = Radius on the draw die where the material flow
through, too big the radii will result wrinkling where too
small will creates cracking at bottom radius of drawn part.
ratio = Refers to the ability of a material to flow or
draw. Affecting the draw depth and size per any single draw.
bead height and shape = To control metal flow and gripping
pressure in deep drawing process, draw bead height and shape
can cause materials to bend and unbend to creates restrictive
forces going into a tool. Increasing pressure will exerts
more force on a material, creating more restraint on material
going into the tool.