Large Diameter Elbow
The pipe bending machine is the same as the bending of sheet metal. In the case of pure bending, when a tube with an outer diameter of D and a wall thickness of t is bent under the action of an external moment M, the outer tube wall of the neutral layer is subjected to tensile stress σ1, and the tube wall becomes thinner; the inner tube of the neutral layer The wall is subjected to tensile stress σ1, and the pipe wall becomes thicker. Moreover, the cross-sectional shape changes from a circular shape to an approximately elliptical shape due to the combined forces F1 and F2. When the deformation is too large, cracks will occur on the outer tube wall and wrinkles on the inner tube wall.
1. Divided by material:
Carbon steel: ASTM/ASME A234 WPB, WPC
Alloy: ASTM/ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP911, 15Mo3 15CrMoV, 35CrMoV
Stainless steel: ASTM/ASME A403 WP 304-304L-304H-304LN-304N ASTM/ASME A403 WP 316-316L-316H-316LN-316N-316Ti ASTM/ASME A403 WP 321-321H ASTM/ASME A403 WP 347-347H
Low temperature steel: ASTM/ASME A402 WPL3-WPL 6
High performance steel: ASTM/ASME A860 WPHY 42-46-52-60-65-70 Cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon leaching, PVC, PPR, RFPP (reinforced polypropylene), etc.
2. According to the production method, it can be divided into pushing, pressing, forging, casting, etc.
3. According to the manufacturing standard, it can be divided into national standard, electric standard, ship standard, chemical standard, water standard, American standard, German standard, Japanese standard, Russian standard, etc.
