Hot riveting refers to the riveting process that takes place after the rivets are heated to a certain temperature. Due to the increased plasticity and reduced hardness of the rivets after heating, the head shaping becomes easier, resulting in a significantly lower external force required during hot riveting compared to cold riveting. Additionally, during the cooling process of the rivets, the shrinkage in the length direction of the rivet shank increases the normal pressure between the sheet materials. Once the sheet materials are subjected to force, they can generate greater frictional resistance, thereby enhancing the riveting strength.
Hot forging is commonly used when the plasticity of the rivet material is poor, the rivet diameter is large, or the clamping force is insufficient.
During hot riveting, the heating temperature of the rivet varies depending on the material of the rivet and the riveting method. For steel rivets, when riveted with a riveting machine, the heating temperature is between 1000℃ and 1100℃; when riveted with a riveting press, the heating temperature is between 650℃ and 670℃. The final riveting temperature should be between 450℃ and 600℃. Basic operations of hot riveting mainly include:
Secure the riveted components. Before riveting, first align the bolt holes of each layer of plates, and tighten with bolts of the appropriate size. The number of bolts should exceed 1/4 the number of bolt holes, and they should be evenly distributed. If some bolt holes are eccentric due to machining errors, use a straightening punch or a reamer to bore the holes for smooth钉 insertion.
Heating Rivets. When heating rivets, an electric furnace or charcoal furnace can be used, with the furnace position as close to the work area as possible. Rivets should be arranged in an orderly manner inside the furnace with appropriate spacing for easy retrieval. As the rivets approach the required temperature, switch to slow-burning to ensure even heating throughout the rivet. To ensure the quality of the riveting, avoid using rivets that are overheated or insufficiently heated.
