Double Internal Elbow Double Internal Wire Elbow 90 Degrees Internal Thread On Both Sides Of The Water Supply Pipe

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 It has been replaced by hot push method or other forming technology in the production of common specifications of elbow.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.