? Riveted screw model
Riveting screw is a stud cut by lathe in riveting screw industry. Its materials are generally stainless steel, carbon steel and copper. Copper materials can be divided into H59 copper and H62 copper. Stainless steel is divided into stainless steel SUS304 and stainless steel SUS303 or SUS302. Generally speaking, carbon steel is easy to cut iron. This is an iron bar that turns easily. Riveting screw is a fastener product for sheet metal. Riveting screws originated from special hardware products produced by PEM/TEXRON and other companies in the United States, which are specially used in telecom industry, sheet metal industry, electronic appliances and other products. At present, the riveting screws produced in China are all produced according to PEM standards, with round head and hexagonal head.
Riveting screws introduce carbon steel riveting screws | stainless steel riveting screws? , product model: FH? 、? FHS？ , product material: carbon-carbon zinc plating? 、? Stainless steel SUS304? . Scope of supply: Metric M2-M 12, length 3 mm -80 mm? . ? America #2- 1/2? ,? Length 1/8-4 inches? . ? Riveting screws can be divided into two types according to their shapes. One is the common round head riveting screw. The other is the hexagon rivet screw which is not commonly used. There is a relief design with tooth pattern under the head of the round head riveting screw, which is formed by cold pier technology, so the production speed and manufacturing cost are relatively low, and the installation method is relatively fast and simple. When in use, punch a small hole slightly larger than the thread on the base plate (the specific size should match the embossed diameter of the tooth pattern under the head of the riveting screw), then place it vertically, and then press it evenly on the plane of the head of the product with riveting equipment. After crimping, the embossed teeth with inclined angle under the head of the rivet screw will bite with the base plate to form a permanent and firm thread. ? Hexagon head riveting screws are different from round head riveting screws. Hexagon head riveting screws are completely clamped in the metal plate through six opposite sides of the screw head to prevent sliding. The production mode is direct turning of hexagonal rod, and its production cost and installation difficulty are higher than those of round head riveting screws. At present, fewer and fewer users use hexagonal rivets. Riveting screws are mostly made of ordinary carbon steel or stainless steel SUS304, which is used to form firm external threads on very thin sheet metal parts.
Therefore, the types of riveting screws are: 1, round head riveting screw FHFHSFHAFH4TFHTFHS? 2. Hexagon riveting screw NFHNFHS? 3. Extrusion screw KFE? 4. Thick rivet screw HFHHFHSHFHB5 and countersunk rivet screw CHACHCCFHACFHC.
Technological process analysis of riveting screws
1. Initial pressing stage of metal plate
The initial pressing stage of the metal plate begins when the punch 1 contacts the upper metal plate and ends when the push rod 5 reaches the dead center. In this process, the upper metal plate is bent and partially plastically deformed under the extrusion force of the punch 1. At this stage, the upper and lower sheets are mainly elastically deformed, accompanied by a small amount of plastic deformation.
2. Initial forming stage of riveting screw connection point
The initial forming stage of the connection point of the riveting screw starts when the push rod 5 reaches the dead center and ends when the lower plate completely contacts the top surface of the push rod 5 and forms the upper profile. In this process, from the beginning to the end, with the downward movement of the punch 1, the upper and lower plates are constrained by the top surface of the push rod 5, the upper side of the die 4, the bottom surface of the punch 1 and its conical surface, and an upper profile is formed under the simultaneous action of elastic deformation and plastic deformation.
3. Plastic forming stage of riveting screw connection point
In the plastic forming stage of the point where the riveting screws are connected, the punch 1 continues to press the upper and lower plates downward until the punch 1 reaches the dead center.
4. Pressure maintaining stage
In the pressure maintaining stage, the die will continue to maintain pressure for a certain period of time, so that the upper and lower plates can fully fill the annular groove, and the pressure riveting connection point can be completely formed, thus preventing the pressure riveting connection point from rebounding. The quality control in the pressure maintaining stage directly affects the qualified rate of products.
Through Bian Xiao's introduction, I believe that friends who are interested in riveting screws or need to buy customized ones must have a good idea, but they should also pay attention to some problems of riveting screws, the models of riveting screws and their metric American size specifications. In addition, the selection of materials depends on the situation, so the model of riveting screws is introduced to you here today. If you need to order riveting screws, you must choose a suitable and reputable merchant according to your actual needs and financial budget, and it is best to take samples for testing, so as to ensure your moderate purchase to a greater extent. Of course, the price of large orders can be negotiable, which is also a good way to save money. The above is about the model of riveting screws, I hope it will help everyone!
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