In the manufacturing process of three-phase capacitors, the precise processing of each component is related to the overall performance of the equipment. As an important part to ensure electrical connection and mechanical fixation, the tapping process in the manufacturing process of nuts is particularly critical. Tapping uses a special tap to cut a standard thread in the inner hole of the nut. This seemingly simple operation actually contains complex principles and strict process requirements. Its core goal is to ensure a good fit between the nut and the bolt or other components, thereby laying the foundation for the stable operation of the three-phase capacitor. ​
The basis of the tapping process lies in the precise grasp of the thread structure. As a common connection structure in mechanical parts, the thread has specific parameters such as tooth type, pitch, and diameter. In the tapping process of three-phase capacitors screw cap, the design of the tap must be highly consistent with these standard parameters. The tap head is conical and has a cutting edge. When the tap is screwed into the inner hole of the nut, the cutting edge gradually cuts into the metal material, removes the excess part, and forms a thread shape. The spiral groove design of the tap is responsible for discharging the metal debris generated during the cutting process to prevent the accumulation of debris from affecting the quality of thread processing. This cutting method is not a simple mechanical cutting, but through precise geometric design and mechanical action, the metal material in the inner hole of the nut is plastically deformed and removed, and finally a regular and standard internal thread is formed. ​
There are many factors that affect the quality of tapping, among which the performance of the raw materials plays a decisive role in the tapping effect. Nuts of different materials, such as stainless steel, copper alloy or special composite materials, have different properties such as hardness and toughness. When tapping, the material with higher hardness is subject to greater resistance, which is easy to wear during the cutting process, and may even cause the tap to break. At the same time, it will also cause defects such as roughness and burrs on the thread surface, affecting the fit with the parts. Although the material with better toughness is relatively easy to cut, it is easy for the material to stick to the tap during the tapping process, which will also affect the accuracy and surface quality of the thread. Therefore, before tapping, the raw materials need to be pre-treated, such as adjusting the hardness of the material through appropriate heat treatment to make it suitable for tapping, so as to improve the quality and efficiency of tapping.​
The selection of tapping equipment and process parameters is also crucial. Advanced tapping equipment has a high-precision transmission system and stable power output, which can ensure the stability and accuracy of the tap during rotation and feeding. The speed and feed rate during tapping directly affect the processing accuracy and surface quality of the thread. If the speed is too fast, the cutting temperature will increase, the tap will wear more, and it may also cause the thread profile to deform; if the speed is too slow, it will reduce production efficiency. If the feed rate is too large, it is easy to make the thread profile too deep, resulting in a tight fit; if the feed rate is too small, the thread profile will be too shallow and the connection strength will be insufficient. Therefore, in actual production, it is necessary to determine the best speed and feed rate combination based on factors such as the nut material and size specifications through a large number of tests and data accumulation to achieve high-quality tapping effects. ​
Cooling and lubrication during tapping are also links that cannot be ignored. During the cutting process, the friction between the tap and the nut material will generate a lot of heat. Excessive temperature will not only accelerate the wear of the tap, but also change the performance of the nut material and affect the quality of the thread. The use of coolant can effectively reduce the cutting temperature, take away the heat generated during the cutting process, and maintain the stable performance of the tap and nut materials. At the same time, the lubricant forms a thin film on the surface of the tap and nut materials, reducing the friction between the two, reducing the cutting resistance, making the cutting process smoother, helping to improve the surface finish of the thread, and ensuring the good fit between the nut and the component. Common cooling and lubrication methods include cutting fluid pouring, oil mist lubrication, etc. Different cooling and lubrication methods are suitable for nuts with different materials and processing requirements. ​
After the tapping is completed, the inspection of the quality of the nut thread is an important guarantee to ensure that it fits well with the component. The inspection content includes the dimensional accuracy of the thread, such as whether the pitch and diameter meet the standards; the surface quality of the thread, such as whether there are defects such as burrs, cracks, and wear; and the matching performance of the thread. Through the screw-in test with the standard bolt, check whether the screw-in is smooth and whether the tightness is appropriate. The inspection methods cover traditional measuring tools, such as thread gauges, calipers, etc., as well as advanced optical measurement, 3D scanning and other technologies. For unqualified nuts detected, it is necessary to analyze the reasons in time and take corrective measures, such as adjusting the parameters of the tapping equipment, replacing the taps or reworking the unqualified nuts, to ensure that each nut can meet the requirements of good matching with the components. ​
In the actual application of three-phase capacitors, good matching of nuts with bolts or other components is crucial. Good matching can ensure the reliability of electrical connections, reduce contact resistance, reduce power loss and heat generation, and avoid safety hazards caused by poor contact. In terms of mechanical fixation, suitable thread matching can make the various components of the capacitor firmly connected, maintain the integrity of the structure in the face of vibration, external force and other working conditions, and prevent components from loosening and falling off. The realization of all these good performances is inseparable from the precise processing and strict quality control of the internal threads of the nuts in the tapping process. ​
With the continuous development of the power industry, the performance requirements for three-phase capacitors are increasing, which also puts higher standards on the quality and performance of nuts. As a key link in the production of nuts, the tapping process will continue to innovate in process optimization, equipment upgrades, and detection technology improvements. By adopting new tap materials to improve wear resistance and cutting performance, using intelligent equipment to achieve precise control of the tapping process and automatic adjustment of parameters, and relying on advanced detection technology to achieve rapid and accurate detection of thread quality, the matching quality of three-phase capacitor nuts and components can be continuously improved, providing more reliable protection for the safe and stable operation of the power system.