HEBEI PENGXIN PIPELINE EQUIPMENT GROUP CO.,LTD |
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Seamless 90D Elbow, ASTM A234 WPB, SCH 60, Beveled Silver gray
Process flow
Seamless elbow: elbow is a pipe fitting used at the bend of a pipe.
The largest proportion of all pipe fittings used in the pipeline
system is about 80. Usually, different forming processes are
selected for bends with different materials or wall thickness. The
seamless elbow forming process used by the manufacturer is hot
push, stamping, extrusion and so on.
stamping forming elbow is the earliest forming process used in
batch production of seamless elbow. it has been replaced by hot
push method or other forming process in the production of elbow of
common specifications, but in some specifications of elbow due to
less production quantity, too thick wall thickness or too thin.
The product is still in use when it has special requirements. The
punching forming of the elbow adopts the pipe billet equal to the
outer diameter of the elbow, and the press is used to press the die
directly.
Before stamping, the tube billet is placed on the lower die, the
inner core and the end die are loaded into the tube billet, 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 forming is not as good as that of the former, and the
outer arc of stamping elbow is in the tensile state when forming,
and there is no extra metal in other parts to compensate, so the
wall thickness at the outer arc is about 10% thinner. But because
it is suitable for single piece production and low cost, stamping
elbow process is mostly used in the manufacture of small batch and
thick wall elbow.
Stamping elbows are divided into cold stamping and hot stamping,
usually according to the material properties and equipment capacity
to choose cold stamping or hot stamping.
The forming process of cold extrusion elbow is to use a special
elbow forming machine to put the tube billet into the outer die.
After the upper and lower die is molded, the tube billet moves
along the gap reserved for the inner die and the outer die under
the push rod.
The elbow made by internal and external die cold extrusion process
is beautiful in appearance, uniform in wall thickness and small in
size deviation. The precision of internal and external die used in
this process is high, and the deviation of wall thickness of pipe
billet is also harsh.
Chinese name | 弯头 | Angle | 45 and 90 180 Three most commonly used |
Foreign Language | elbow | attended mode | Direct welding flange connections |
Alias | forge and press;forge and stamp | Classification | Welding elbow, punching elbow, pushing elbow, etc |
Applications | Plumbing installation |