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2. Die forming (plastics) - Wikipedia

   en.wikipedia.org/wiki/Die_Forming_(Plastics)

   Tube forming dies allow for continuous extrusion of thick walled (relative to blown film extrusion) tubes and pipes. [5] The dies themselves are almost identical to those used in blown film extrusion; the only major difference is the gap between the inner mandrel and outer die wall.

3. Plastic extrusion - Wikipedia

   en.wikipedia.org/wiki/Plastic_extrusion

   Annular dies are the simplest, and rely on the polymer melt channeling around the entire cross section of the die before exiting the die; this can result in uneven flow. Spider dies consist of a central mandrel attached to the outer die ring via a number of "legs"; while flow is more symmetrical than in annular dies, a number of weld lines are ...

4. Tube bending - Wikipedia

   en.wikipedia.org/wiki/Tube_bending

   The process of tube bending involves using mechanical force to push stock material pipe or tubing against a die, forcing the pipe or tube to conform to the shape of the die. Often, stock tubing is held firmly in place while the end is rotated and rolled around the die. Other forms of processing including pushing stock through rollers that bend ...

5. Hydroforming - Wikipedia

   en.wikipedia.org/wiki/Hydroforming

   In tube hydroforming pressure is applied to the inside of a tube that is held by dies with the desired cross sections and forms. When the dies are closed, the tube ends are sealed by axial punches and the tube is filled with hydraulic fluid. The internal pressure can go up to a few thousand bars and it causes the tube to calibrate against the dies.

6. Drawing (manufacturing) - Wikipedia

   en.wikipedia.org/wiki/Drawing_(manufacturing)

   Tube lubrication: The surface of the bar or tube is coated with a drawing lubricant such as phosphate or oil to aid cold drawing. Push Pointing: Several inches of the lead ends of the bar or tube are reduced in size by swaging or extruding so that it can pass freely through the drawing die. This is done because the die opening is always smaller ...

7. Reynolds 531 - Wikipedia

   en.wikipedia.org/wiki/Reynolds_531

   Reynolds 531 (pronounced 'five-three-one') is a brand name, registered to Reynolds Technology of Birmingham in the United Kingdom, for a manganese–molybdenum, medium-carbon steel tubing that was used in many quality applications, including race car chassis, aircraft components and, most famously, bicycle frame tubing. It is one of a number of ...