TOBO STEEL GROUP CHINA |
Verified Suppliers
|
|
Double Internal Elbow Double Internal Wire Elbow 90 Degrees Internal Thread On Both Sides Of The Water Supply Pipe
Stamping elbow is the earliest forming technology used in mass
production of seamless elbow. It has been replaced by hot push
method or other forming technology in the production of common
specifications of elbow. However, in some specifications of elbow,
the production quantity is small, the wall thickness is too thick
or too thin.
The product is still in use when it has special requirements. Elbow
stamping is formed by using the tube blank equal to the outer
diameter of the elbow, which is directly pressed by the press in
the mold.
Before stamping, the tube blank is placed on the lower die, and the
inner core and end die are loaded into the tube blank. The upper
die moves down and begins to press, and the elbow is formed by the
constraint of the outer die and the support of the inner die.
Compared with the hot push process, the appearance quality of
stamping is inferior to the former. When the stamping elbow is
formed, the outer arc is in a stretch state, and there is no excess
metal compensation in other parts, so the wall thickness at the
outer arc is reduced about 10%. However, due to the characteristics
of being suitable for single piece production and low cost,
stamping elbow technology is mostly used in the manufacture of
small batch and thick wall elbow.
Stamping elbow is divided into cold stamping and hot stamping,
usually according to the material properties and equipment capacity
of the choice of cold stamping or hot stamping.
The forming process of cold extrusion elbow is to use a special
elbow forming machine, put the tube blank into the outer mold,
after the upper and lower mold, under the push rod, the tube blank
along the inner mold and the outer mold reserved clearance movement
and complete the forming process.
Using internal and external die cold extrusion process
manufacturing elbow beautiful appearance, uniform wall thickness,
small size deviation, so for stainless steel elbow, especially
thin-walled stainless steel elbow forming more use this process
manufacturing. The internal and external mold used in this process
requires high precision; The requirement of wall thickness
deviation is also very strict.