What is riveting? The so-called pressure riveting refers to the process of riveting in the process of external pressure, pressure riveting parts to the body material plastic deformation, and extrusion riveting screw, nut structure in the special prefabricated slot, thus the reliable connection of two parts is realized. Common low-carbon steel, aluminum alloy plate, copper plate is suitable for compression riveting nut column, for stainless steel and high-carbon steel plate because the material is more rigid, need special high-strength compression riveting nut column, therefore, as far as possible, stainless steel is not used in sheet metal parts with press-riveted nut column and press-riveted nut.
There are two kinds of non-standard nuts for riveting, one is the riveting nut column, one is the riveting nut. The connection with the base material is realized by the riveting form, which usually requires the hardness of the riveted part to be greater than the hardness of the base material.
1. After riveting, the inclined riveting parts shall not loose or fall off, and their firmness shall be tested, and the values of push-pull force and torque shall meet the requirements of PEM of the riveting parts.
2. Before rivet pressing, make sure that the outer mark of the rivet and the material (material, specification) in the bag meet the requirement of the drawing and whether there is any mixture in the bag.
3, for the bending edge or die forming edge near the pressure riveting parts to focus on, especially the thread, appearance (deformation) to focus on detection.
4. Random sampling check the material, specification, type and thread of the riveting parts after the riveting, whether they meet the requirement of the drawing, whether there are leakage pressure, wrong pressure, wrong position pressure, mixed pressure and so on.
5、压铆后压铆件的螺纹必须合格,通规通,止规止。11、压铆完成后需检验其平面度是否在范围内若超标需转入钳工校形处理。
6. How to control the quality of riveting process 1. Riveting process: riveting nuts, screws, studs and custom hardware riveting parts (guide pin, positioning support column, etc.) , electrostatic hand bowl seat, riveting wrench, etc.
7. For the riveting parts which are near the edge of the product or the edge of the hole, the obvious deformation of the edge of the product or the edge of the hole will be caused after the riveting, according to the deformation of the material to take appropriate measures (such as calibration/grinding) to achieve the drawing size, appearance requirements.
8. After pressing rivets, there shall not be the phenomenon of pressing deviation and deviation, and the thread must be concentric with the corresponding hole.
9. The material and specifications of the riveting parts must be in accordance with the drawings and the wrong specifications shall not be allowed;
10, after the riveting press riveting parts around or convex or concave obvious deformation, there is no obvious surface treatment can not be covered by the imprint or die.
Riveting is divided into tension riveting, pressure riveting, rotary riveting, self-piercing riveting, riveting without riveting, and so on. The tools required for pressure riveting are generally pressure riveting machine or large-scale pressure riveting equipment, the following is the definition of pressure riveting and riveting process how to carry out quality control.