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Views: 0 Author: Site Editor Publish Time: 2026-09-02 Origin: Site
Metal dome spinning is a specialized rotational cold-forming process engineered to manufacture seamless, high-strength hemispherical, parabolic, and elliptical dished structures from flat circular blanks. Used extensively across pressure vessel fabrication, industrial lighting, aerospace fairings, architectural design, and HVAC tank heads, spun metal domes provide superior structural integrity compared to multi-piece welded assemblies. By leveraging automated multi-axis CNC spinning lathes and high-tonnage hydraulic force control, custom manufacturers can achieve precise crown radii, uniform wall thickness, and smooth surface finishes across both small precision caps and large industrial tank heads. As a full-service OEM contract manufacturer, we offer complete metal dome spinning capabilities—from prototype tooling design and alloy selection to high-volume production and precision secondary processing.
Spun metal domes are manufactured in several distinct geometric configurations to meet specific pressure distribution, aerodynamic, or acoustic requirements.
Features a constant radius equal to half the outer diameter, distributing internal pressure uniformly across the entire surface shell.
High-pressure gas receivers, aerospace propellant tank caps, subsea exploration pressure hulls, and architectural skylight structures.
Combines a large crown radius with a smaller knuckle radius and straight flange skirt, optimizing fluid volume capacity while easing pressure vessel fit-up.
Storage tanks, industrial boilers, chemical reactors, and sanitary food-processing mixing vessels.
Engineered with precise mathematical curvature to focus or disperse light, sound, or radio-frequency signals cleanly without distortion.
Commercial architectural lighting fixtures, satellite dish reflectors, parabolic acoustic collectors, and directional radar covers.
Geometry & Mechanics: Low-profile curved discs featuring a flat outer rim or turned flange skirt designed for easy mechanical fastening or circumferential welding.
Primary Applications: HVAC venturi cowls, machinery end caps, centrifugal separator covers, and pipeline end caps.
Achieving tight radius tolerances on spun metal domes requires precise selection of ductile material stock tailored to the part's final operating environment.
High ductility and low work-hardening rates make these grades ideal for deep-draw hemispherical lighting domes, architectural fixtures, and decorative domes.
5052 provides exceptional marine-grade corrosion resistance. 6061 is spun in the ductile 'O' temper state and subsequently heat-treated to T4 or T6 temper for high-strength structural enclosures.
Widely specified for sanitary food equipment, pharmaceutical reactors, and pressure vessel heads due to superior corrosion resistance. Intermediate annealing passes are applied on deep dished heads to relieve roller-induced strain hardening.
Used for cost-effective architectural elements and automotive exhaust caps where moderate formability and magnetic properties are required.
SPCC and DD14 sheet metal offer smooth material flow for commercial machine covers, air tank heads, and pulley housings.
Heavy-gauge pressure vessel steel spun using high-tonnage hydraulic flow-forming rollers to form certified pressure-retaining dished heads.
Selected for high thermal/electrical conductivity, decorative architectural domes, luxury lighting, and musical instrument resonators requiring high-luster surface polishing.
Optimizing dome designs for automated CNC spinning reduces tooling costs, minimizes scrap rates, and accelerates unit cycle times.
During deep hemispherical spinning, material stretches along the sidewalls while thickening slightly near the outer perimeter edge.
Engineers should specify minimum structural wall thickness (tmin) at the thinnest section (typically near the crown transition) rather than a rigid nominal thickness across the entire profile.
Maintain an internal knuckle radius (Rk) of at least 3 to 5 times starting material thickness (Rk ≥ 3t) on torispherical designs to prevent localized stress concentration and surface wrinkling.
Straight Skirt Integration: Incorporate a straight cylindrical flange skirt (typically 15 mm to 50 mm long) at the base of the dome to facilitate automated in-lathe edge trimming, bead rolling, or subsequent circumferential butt welding.
Contract OEM CNC metal dome spinning providers integrate multiple secondary processing steps within a single quality framework.
Custom forming capabilities handling blank diameters ranging from 50 mm up to 3000 mm.
Cold forming capabilities up to 12 mm in carbon steel, 8 mm in stainless steel, and 16 mm in aluminum alloys; hot spinning capabilities for heavier structural gauges.
Automated roller tooling cuts edge scrap, turns inner/outer flanges, and rolls 180-degree safety beads in the same clamping setup.
Multi-axis fiber lasers cut central nozzle holes, side ports, mounting slots, and complex non-axisymmetrical cutouts directly on spun domes within +/-0.05 mm accuracy.
Automated robotic mirror polishing (8K), satin grain brushing, anodizing, electro-polishing, and protective powder coating.
Metal dome spinning provides Original Equipment Manufacturers with a seamless, highly repeatable, and cost-effective manufacturing solution for producing strong rotational components. By combining automated CNC spinning lathes, sound DFM practices, broad material selection, and precision secondary laser processing, contract spinners deliver high-performance metal domes optimized for demanding industrial, aerospace, and commercial applications.
