Deep Drawing Parts Of Stainless Steel Part Metal Deep Drawing Parts
Stainless steel deep-drawn parts
It is often difficult for metal stamping companies and tool shops
that use ordinary carbon steel to make parts from stainless steel.
Past negative experiences and poorly designed manufacturing
processes often produce misunderstandings and myths about these
For example: the hardening rate of all stainless steel is higher
than that of ordinary carbon steel. This fact contributes to a
long-standing myth that stainless steel is more difficult to form
than low-carbon steel because they work too fast. In reality,
stainless steel is very formable. In fact, some grades of
inductance are much higher than ordinary carbon steel. In addition
(another myth-breaker), stainless steel is often deep drawn into
difficult shapes, without intermediate fading. Even ferrite grades
that are not easy to form have outstanding ductility and are easy
to be painted in depth. The North American Specialty Steel Industry
Association is a voluntary industry association that represents
almost all specialty steel producers in North America. It asserts
that it is not difficult to cooperate with stainless steel, it is
Stainless steel is an iron-based alloy with a chromium content of
more than 10.5%. The chromium in the steel naturally reacts with
the oxygen in the air to form a passive chromium oxide (Cr2O3) film
on the surface of the steel. Simply put, being passive means that
the board no longer chemically reacts to its surrounding
environment. It is this passive membrane that stainless steel lacks
its corrosion resistance.
Essentially, two sets of stainless steels are commonly used for
deep-drawn metal stamping: these steels are classified into the
celestial and ferrite groups. Type 200 and 300 series identify
groups of celestial bodies. Types 304 and 316 are non-magnetic
types and are the most widely used grades in the celestial group:
Type 304 is the most common. Some difficult deep paintings may
require a special version with a slightly higher nickel content of
grade 304. This grade is sometimes referred to as 304 DDQ. However,
using 304 DDQ by default is not a reasonable approach because it is
more expensive and unavailable. In addition, most depth drawings
can be easily implemented with standard grade materials, such as
304 or 305.
The type 400 series identifies the ferrite group, although there
are also some Matensi stainless steels in the 400 series. Type 430
is a general-purpose stainless steel made of ferrite. Its ductility
is similar to that of carbon steel, and this grade is magnetic.
Both ferrite and celestial stainless steel work faster than carbon
steel. Therefore, the pressure to form stainless steel is higher
than that of ordinary carbon steel with the same thickness and
temper. In addition, the chromium oxide surface film, even if it is
a very thin layer, significantly increases the level of friction
between the tool and the work piece. The combination of high
forming pressure and surface friction results in a tool wear rate
that is significantly higher than the tool wear rate used to form
carbon steel. These higher wear rates increase tool maintenance,
downtime and production costs. Therefore, appropriate processing
methods, tool coatings and lubricants must be used to improve
overall tool performance.
|Mould material||D2,DC53,YG15,YG20,SKD11/51/61,SKH-9,Cr12mov, Cr12,45#, etc.|
|Product material||copper, brass, metal, stainless steel, BeCu,aluminum|
|Processing methods||Forings,CNC milling and turning,Grinding,Broaching,etc.|
|Processing equipment||CNC machine,Automotic lathe machine,EDM machine,Stamping
machine,Punching/Drilling machine,Ultrasonec cleaning machine,etc.|
|Detection equipment||Projector,Calliper,Height gauge,Screw gauge,Hardness gauge,etc.|
|Application||Electronic:Vehicle parts,CNC machining parts,Wireless receiver
metal parts, 3G/4G Modem Wireless Network metal parts,USB housing.
Automotive interior parts: connector, navigation frame, car key.
All kinds of connectors, digital parts.|
|surface treatment||Plating,Painting,Powder coating,Anodization|
|Vibration grinding,Polishing,Brushing.or according to customer’s
|Design software||PROE ,,UG,SOLIDWORK, CAD,etc.|
|Cavity||Single / Multi per request|
|Mould life||1-30million shots|
|Specification||Many years machining parts processing experience;Precision
tolerance less than 0.001mm;Depends on customer’s requirements.|
|Delivery||Normally within 7-45 days (according to customer drawing, quantity
and material) special case will be sooner|
Wooden case or as customer's requirements
Precautions for the production of stainless steel deep-drawn parts
Due to the fast working hardening speed of stainless steel, more
pressure and press energy are required. Generally, compared with
ordinary carbon steel of the same thickness, it needs to be
increased by 100%.
The mold material must have sufficient hardness and a highly
polished surface. D2 is a high chromium alloy tool steel, which is
the most commonly used steel in stamping dies. Since stainless
steel also contains a high concentration of chromium, it is best to
avoid such molding materials in deep drawing and severe forming
applications. Whenever sliding occurs between two materials, you
must ensure that the materials in contact are different to avoid
pain. The best deep drawing performance is usually achieved by
using cemented carbide drawing rings or duralumin bronze devices.
Extreme pressure lubricants are essential for deep drawing
stainless steel, but soluble oils can be used with aluminum bronze
tools. Common practice should include lubricating the sides of the
blank to reduce the tendency for timidity.
Polyethylene (PE) or polyvinyl chloride (PVC) plastic film can be
applied to the steel surface to help paint and protect the surface
surface. These films provide excellent lubrication and have a lower
coefficient of friction value than oil. PE is usually sufficient
for most purposes, but PVC may be required for serious draws and
multiple molding operations. Warning: Both may be difficult to
delete and should not be left on the stamped part for a long time.
Exposure to the sun may make them impossible to remove.
The pressure of the blank holder is much higher than that of carbon
steel. The iron grade (430) requires about 50% of the pressure,
while the celestial grade (304, 316) may require up to three times
the strength of ordinary carbon steel. This is an important factor
that needs to be considered when evaluating news energy and tonnage
capacity in the news selection process.
Due to the high pressure and frictional heat, the drawing speed
will be much slower than that of ordinary carbon steel. A unique
feature of cold-formed stainless steel is that when a slower
forming speed is used, more severe deformation may occur. This is
very different from ordinary carbon steel. Regardless of the
formation speed, the formation form of ordinary carbon steel is
almost the same. Generally speaking, when the stainless steel is
formed into a difficult shape, the speed is reduced.
Compared with ordinary carbon steel, stainless steel has a larger
required gap between the broaching hole and the cavity wall.
Generally speaking, celestial grades require alloy thickness plus
an additional 35% to 40%: most ferroalloys require material
thickness plus 10% to 15% additional clearance.