What should I pay attention to when machining the self-locking tuning screw of 5G filter?

Precision requirements

Dimensional accuracy: The dimensional accuracy of the self-locking tuning screw of 5G filter is extremely high. Because in 5G communication equipment, the working frequency of the filter is high, and it is sensitive to the dimensional accuracy of parts. Generally, the dimensional tolerances such as the diameter and length of screws should be controlled at micron level. For example, the diameter tolerance may need to be controlled within ±0.005mm to ensure that it can be installed in the corresponding position of the filter accurately and achieve good tuning function.

Thread precision: the precision of thread is directly related to the self-locking performance of screw and the accuracy of tuning. For the screw for 5G filter, the parameters such as thread pitch and tooth profile angle must strictly meet the design standards. Generally, high-precision thread rolling or thread rubbing technology is adopted, and it must be inspected by sophisticated thread detection equipment. For example, the error range should be controlled within a very small range to ensure that the screw is closely matched with the threaded hole on the filter and prevent loosening.

Material characteristics

Select appropriate materials: Because the working environment of 5G filter is complex, it may be affected by electromagnetic interference, temperature change and other factors, so the self-locking tuning screw should be made of materials with good conductivity, corrosion resistance and thermal stability. For example, commonly used materials are stainless steel (such as 304 and 316 stainless steel) and copper alloy (such as beryllium bronze). Stainless steel material has good corrosion resistance and can keep stable performance in different humidity and chemical environments; Copper alloy has excellent conductivity, which helps to reduce electromagnetic interference.

Material quality control: before processing, strict quality inspection should be carried out on materials. Check whether the chemical composition of the material meets the requirements, for example, for stainless steel materials, the content of alloying elements such as chromium and nickel should be detected to ensure its good corrosion resistance. At the same time, check the physical properties of materials, such as hardness and toughness. The hardness of the material should be moderate, too hard may lead to processing difficulties, and too soft will affect the mechanical properties of the screw, such as tensile strength and fatigue strength.

Processing technology

Cutting: In the cutting process, it is necessary to select appropriate tools and cutting parameters. Because of the high dimensional accuracy of screws, high-precision cemented carbide tools should be used, and the cutting speed, feed and cutting depth should be adjusted according to the hardness and toughness of materials. For example, when processing stainless steel materials, the cutting speed is generally lower than that of processing ordinary carbon steel, so as to reduce tool wear and surface roughness. At the same time, it is necessary to use appropriate cutting fluid to play a role in cooling and lubricating, and to prevent the workpiece and tool from being damaged due to overheating.

Surface treatment: In order to improve the self-locking performance and corrosion resistance of screws, proper surface treatment is needed. For example, electroplating processes, such as nickel plating and chromium plating, are adopted. The thickness of the electroplated layer should be uniform, generally between several microns and tens of microns, and the electroplated layer should be firmly combined with the base material. After electroplating, strict quality inspection should be carried out, such as salt spray test to detect its corrosion resistance, to ensure that the screws after surface treatment can be used for a long time in harsh environment.

Heat treatment process (if necessary): according to the material and performance requirements of screws, heat treatment may be needed. For example, for some high-strength alloy steel screws, the hardness and toughness are improved by quenching and tempering processes. In the process of heat treatment, parameters such as heating temperature, holding time and cooling rate should be strictly controlled. Excessive heating temperature may lead to overheating of materials and affect their properties; Improper cooling rate may cause defects such as cracks.

Quality inspection

Visual inspection: The processed screws should be visually inspected to check whether there are scratches, cracks, burrs and other defects on the surface. Burrs may affect the installation and self-locking performance of screws, while scratches and cracks may cause the screws to be damaged during use. Microscope and other equipment can be used for microscopic inspection to ensure that the appearance quality of screws meets the requirements.

Dimension and form tolerance detection: Use high-precision measuring tools, such as three-coordinate measuring instruments, to detect the dimension and form tolerance of screws. In addition to measuring the basic dimensions such as diameter and length, it is also necessary to detect the form and position tolerances such as cylindricity and verticality. For example, the cylindricity error of the screw should generally be controlled within 0.003mm to ensure its installation accuracy and tuning function in the filter.

Performance test: Perform performance test on the finished self-locking tuning screw, including self-locking performance test and electromagnetic compatibility test. The self-locking performance test can simulate the actual use environment and detect whether the screw will loosen under the conditions of vibration, temperature change and so on. The electromagnetic compatibility test is to ensure that the screw will not produce electromagnetic interference in the 5G communication environment, which will affect the normal operation of the filter.