Hot melt fastening technology, a new realm of screwing
Luoyou mentioned that there is a hot-melt fastening technology in the fastener industry, which does not require pre-opening, and can be directly tapped under the closed profile to achieve connection, which is used more and more in the automotive industry.
The hot-melt fastening technology is a cold-forming process that self-tapping and screwing after the high-speed rotation of the motor is transmitted through the center of the device to the plastic deformation of the sheet to be joined.
According to the message of Luoyou, Xiaobian compiled a technical study about this kind of technology. Now let's take a look at the animation of a robot screw.
Then carefully pass the following animation
Look at the action of tightening the screw
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At the beginning of the tightening process, the hot-melt screw is placed on the surface of the aluminum plate or steel sheet without pre-drilling, and the high-speed rotating screw applies a high downforce to the surface of the workpiece while generating extremely high frictional heat to melt the metal. Subsequently, the tip of the screw penetrates the material, forming a perforation, and gradually begins to tap. Once the thread is formed, the screw is tightened to a predetermined torque.
Hot melt fastening process steps and process description, including six stages: rotation (heating) → penetration → through hole → tapping thread → threading → fastening.
In the initial stage, the high-speed rotating motor drive screw contacts the surface of the workpiece and applies downward axial pressure (axial force up to 1.5kN, rotation speed up to 8000rpm), and the screw head rubs against the surface of the sheet metal part. It also produces a high temperature, which is substantially between 600 and 900 ° C. The metal in the vicinity of the screw softens rapidly and the heated material extends upward along the taper.
When the FDS screw penetrates the material, most of the hot-melt sheet metal material will flow to the lower part of the drill hole to form a metal bushing 1 to 3 times thick. The inner surface of the bushing is formed by the FDS screw screw thread to form the meshing thread. Tighten. The entire machining process takes only 1~6s to complete the fastening effect and the torque can reach 15Nm.
At the same time, the FDS nail will remain for a period of time after being tightened in place, and a pre-tightening force will be generated under the action of the rotating torque, which can improve the reliability of the threaded connection, the looseness of the thread and the fatigue strength of the thread, and enhance the tightness of the connection. And rigid.
After tightening
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Screw close-up
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Many European car manufacturers have already begun to use hot-melt fastening technologies, such as Jaguar XK and X150, Audi R8, A8, TT Coupe, A6, etc.; European Nissan, Land Rover, Porsche, BMW and many other car brands have also introduced the connection. Process; SAIC GM's newly launched Cadillac CT6 model achieved the first localization of steel-alloy white body, combined with 11 different materials, and also used this connection technology.
These nails are made of specially-formed cemented carbide materials. The procurement of such screws is mainly based on foreign imports. Although many foreign car companies have adopted this fastening technology for many years, domestic self-owned brands are very popular. less.
Commonly used distance measurement methods include tape measure distance and photoelectric distance measurement. The measuring distance of a tape measure is measured along the ground using a tape-like ruler that can be rolled up, which is a direct measuring distance. Photoelectric ranging is to use an instrument to transmit and receive modulated light waves between two points, and measure the distance according to its propagation speed and time. It belongs to electronic physical ranging. Photoelectric ranging is indirect ranging.
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