Public information regarding the specific manufacturing details of grooved couplings is limited; the following outlines the mainstream production workflow based on standard industry processing practices:
Raw Material Preparation
Base materials such as ductile iron, stainless steel, or cast steel-compliant with national standards-are selected. Auxiliary components, including fire-safety certified rubber gaskets and high-strength locking bolts, are also prepared.
Body Forming
Molten metal is poured into custom molds using precision casting to form the arc-shaped coupling segments; upon cooling, these rough castings are obtained. Some stainless steel models are formed as a single piece using a stamping process.
Machining
The rough castings undergo deburring and grinding. Key features-such as the internal locking grooves and bolt mounting holes-are machined to ensure dimensional accuracy meets industry standards like CJ/T 156-2001.
Surface Anti-Corrosion Treatment
The outer surfaces undergo anti-corrosion treatments, such as electrostatic powder coating or hot-dip galvanizing, to enhance rust and corrosion resistance, making them suitable for underground or humid operating environments.