pyörreliitokset

Pyörreliitokset, or swirl joints, are a type of mechanical fastener used in sheet metal fabrication. They are characterized by a series of interlocking helical elements that, when twisted together, create a strong and secure connection. This method is often employed when welding or riveting is not feasible or desirable due to material properties or aesthetic considerations.

The process of creating a pyörreliitos typically involves specialized tooling that forms the helical threads into the edges of the sheet metal parts. Once formed, the parts are brought together and rotated, allowing the threads to engage and pull the sheets tightly against each other. The resulting joint is often flush and can be designed to be leak-proof, making it suitable for applications where seals are important.

Pyörreliitokset offer several advantages, including a smooth surface finish without protrusions, good vibration resistance, and the ability to be disassembled and reassembled if necessary, although this can weaken the joint over time. They are commonly found in the automotive industry, aerospace, and in the manufacturing of appliances and consumer goods where efficient and aesthetically pleasing assembly methods are required. The strength and reliability of the joint depend on factors such as sheet metal thickness, the pitch and depth of the helical elements, and the materials used.