Stainless steel hollow rivets are highly versatile and durable fasteners widely used in various industrial applications. Understanding their manufacturing process provides valuable insights into their exceptional qualities and performance.
Material Selection and Preparation:
Stainless steel, known for its high corrosion resistance and strength, is the primary material used for hollow rivets. It undergoes rigorous quality checks to ensure its adherence to industry standards and desired properties. The stainless steel is then cut into specific lengths and diameters based on the required rivet size.
Cold Heading and Extrusion:
Cold Heading:
To shape the rivet head, the prepared steel is subjected to cold heading. This technique involves applying high pressure to the end of the steel, causing it to deform and form the desired head shape.
Extrusion:
To create the hollow center of the rivet, the headed steel is extruded. A mandrel is inserted into the steel, and pressure is applied to force the metal through the mandrel, creating a hollow cavity.
Annealing and Pickling:
Annealing:
To soften the metal and relieve any internal stresses caused by the cold working, the extruded rivets are annealed. This involves heating them to a specific temperature and then allowing them to cool slowly.
Pickling:
After annealing, the rivets are pickled in an acid bath. This process removes any oxide layer formed during annealing, resulting in a clean and smooth surface.
Secondary Operations:
Threading:
Some hollow rivets require threading to facilitate their installation into threaded holes. The threading operation involves cutting threads onto the surface of the rivet using a threading machine.
Knurling:
Knurling is a process that creates a diamond-shaped pattern on the rivet surface. This pattern provides additional grip and prevents the rivet from loosening under vibrations or shear forces.
Packaging and Inspection:
Packaging:
Once the manufacturing process is complete, the hollow rivets are packed for distribution and storage. They are typically shipped in bulk quantities or in smaller retail packages depending on the requirement.
Inspection:
Rigorous quality inspections are performed throughout the manufacturing process to ensure compliance with specifications and performance standards. This includes dimensional accuracy, surface finish, and mechanical properties.
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