What is pressure riveting? How to control riveting quality?

Riveting is divided into tension riveting, pressure riveting, rotary riveting, self-piercing riveting and rivetless riveting. The tools needed for riveting are generally riveting machines or large riveting equipment. The following is the definition of riveting and how to control the quality of riveting process. What is pressure riveting? The so-called pressure riveting refers to the way in which the body material is plastically deformed under the action of external pressure during the riveting process, and is squeezed into the specially prefabricated groove in the riveting screw and nut structure, so as to realize the reliable connection of the two parts. Ordinary low-carbon steel, aluminum alloy plate and copper plate are suitable for riveting nut columns, while stainless steel and high-carbon steel plates need special high-strength riveting nut columns because of their hard materials, so stainless steel is not used as far as possible for sheet metal parts with riveting nut columns and riveting nuts. Including riveted screws and riveted nuts, not suitable for stainless steel plates. There are two kinds of non-standard nuts for pressure riveting, one is the pressure riveting nut column and the other is the pressure riveting nut. This riveting form is used to realize the connection with the substrate. This riveting form usually requires that the hardness of the riveted parts is greater than that of the base material. How to control the quality of riveting process 1? Processing contents of riveting process: riveting nuts, screws, studs and customized hardware riveting parts (guide pins, positioning support columns, etc.). ), electrostatic hand bowl seat, riveting wrench, etc. 2. For riveted parts near the edge of the product or the periphery of the hole, the edge of the product or the periphery of the hole will be obviously deformed after riveting, and corresponding measures (such as shape correction and/or polishing) shall be taken according to the deformation and material expansion to meet the requirements of drawing size and appearance. 3. After riveting, there shall be no deviation or offset, and the thread must be concentric with its corresponding hole. 4. The materials, specifications and models of riveted parts must be consistent with the drawings, and the specifications must not be wrong; 5. After riveting, there should be no obvious deformation around the riveted parts, such as protrusions or depressions, and there should be no obvious indentation or die marks that cannot be covered by surface treatment. 6. After riveting, it is not allowed to tilt. Riveted parts must not be loose or fall off, and their firmness must be tested. Its push-pull force and torque values must meet the requirements specified by PEM in its specifications. 7. Before riveting, it is necessary to confirm in time whether the external identification of the riveting parts used in the production line and the physical objects (materials, specifications and models) in the packaging bag meet the requirements of the drawings, and whether there is mixed packing in the packaging bag. 8. Pay special attention to the riveting parts near the bending edge or molding edge of the die, especially the thread and appearance (deformation). 9. After riveting, randomly check whether the materials, specifications and threads of the riveted parts on the product meet the requirements of the drawings, and whether there are any phenomena such as pressure leakage, wrong pressure, dislocation pressure and mixed pressure. 10. After riveting, the threads of riveted parts must be qualified and conform to the regulations. 1 1. After riveting, it is necessary to check whether its flatness is within the range. If it exceeds the standard, it needs to be transferred to the fitter for shape correction. 12. There are a large number of studs and screws for riveting in a single product. Some products will be riveted with special fixtures, and special inspection tools are needed to check whether there are any bad defects such as pressure leakage or wrong pressure. Shanghai Tubo Industrial Technology Co., Ltd. focuses on riveting technology and riveting assembly solutions.