The working principle of the automatic pressure riveting riveting machine
Pressure to coil downward movement first to preloading tight riveting material, in order to prevent the material under the force of rivet flow inside to die, and then the punch movement down pushing the rivet pierced the upper material. In under the joint action of concave die and punch rivet tail open formation in the lower metal bell shape in order to lock up, achieve the connection. Riveting two layers of metal materials, the same thicker in the lower level; Riveting two layers of different metal materials, plastic material in lower level; Riveting metal and nonmetal materials, metal materials in the lower.
3.1.2 the riveting characteristics From riveting technology with spot welding, resistance welding connection is difficult to replace the advantages of a can connect different material, connection method is fatigue resistance, good sealing effect and prevent infiltration function, easy to realize mechanization, small energy consumption, use small space, no pollution, etc. 3.1.3 the riveted joint application Improve the economic benefit of the car now, must make lightweight car body, and lightweight car body is very important measures is to introduce new materials, such as, coating sheet steel, aluminum, reinforced plastics, composite materials, etc. And these new material connection to use the spot welding is powerless. Rushed to the riveting technology and the quality of resistance spot welding technology to connect comparison shows that all difficult to welding fittings can be used from riveting technology, and the impact of riveting pieces of fatigue strength is higher than the product.
3.2 punching riveting technology punching riveting process is to use the punching machine and riveting (solid partners, hollow rivet) within one and less than the combined process of connection connect solid materials. By fitting don't need to like other riveting process to advance drilling or punching.
3.2.1 punch riveting solid solid rivet rivet punch riveting, the first step is to connect the workpiece on the blunt template. Including billet clamp riveting device upside down, make the rivet riveting die in a single stamping processes through artifacts.
3.2.2 half a hollow rivet punch riveting With half a hollow rivet during punching riveting, as shown in figure 21 b, the first step is to put on blunt template artifacts (below). Riveting die down, in a single stamping process to make half a hollow rivet through the upper metal plate, and pressure into the lower plate. Rivet deformation, open at the bottom of the form a fixed part, generally do not fully penetrate the lower plate. Figure 21 solid rivet half hollow rivets
The characteristics of 3.2.3 punching riveting process
1) used to connect to the same, and not of the same material (such as steel, plastic, aluminum), thickness and strength of different parts, and painted sheet metal.
2) does not require advance punching or drilling, does not require current or vacuum stripping.
3) licensed materials total thickness: 6.5 mm steel; 11 mm aluminium.
4) low thermal connection method and low noise.