Supply Nanjing Head

Head is the cap on the pressure vessel is a major pressure parts of the pressure vessel. ● Quality head is directly related to the pressure vessel safe and reliable long-term operation. The importance of the importance of quality head head shape: National Standard GB150 cross-sectional shape of the curvature of the design head shape and thickness of the necessary relations head of head of the central portion of the necessary thickness of the cylinder head thickness hemispherical design thickness (HH) as head 20mm when R = D × 0.5 cylinder plate thickness of 1/2 10mm 2: 1 an elliptical circular (EH) R = D × 0.9 (approximate 値) and cylinder 8 times body plate thickness 20mm 10% same dish head (DHB) R = D cylinder plate thickness × 1.54 31mm Flat top (flat) R = infinite plate thickness of 160mm cylinder head shape Requirements: JB / T4746 head standard requires that: ● Head model must be used to check the whole shape. ● Shape tolerance: convex not more than 1.25% Di, recessed no more than 0.625% Di. ● radius of not less than a predetermined value in the transition section design. ● spherical body: the curvature effect head thickness ● TRANSITION: lower sphere and cylinder connection ● straight edge peak stress: avoid stress welding transition peak stress and cylinder group head superimposed on the shape of requirements: classification processing method Processing range Head cold cold stamping Thickness: 2 ~ 24mm; diameter: Φ 108 ~ Φ 3200mm cold spinning thickness: ~ 24mm; diameter: Φ 750 ~ Φ 8800mm split Method thickness: ~ 32mm; swelling labor law Head plans to implement thermally processing the hot stamping thickness: ~ 250mm; diameter: ~ Φ 3200mm hot spinning thickness: ~ 80mm; Diameter: Φ 1700 ~ Φ 4200mm head shape requirements: Features hot cold working characteristics 1. unheated, not Material deterioration will occur, especially for stainless steel head machining. Due to heating, the material deterioration occurs, resulting in decreased corrosion resistance of stainless steel head is not suitable for processing stainless steel head. 2. without heating, no cooling shrinkage caused dimensional changes, regular shape, size, accuracy and consistency thermoforming, leading to mold thermal expansion and contraction of head cooling, the size difference is difficult to control and consistency. 3. unheated, surface smooth surface to maintain the original material after forming head, beautiful appearance. By heating the surface oxide formed after severe head and difficult to remove.