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電阻體電引出端的制作
The riveted cap is most suitable for cylindrical film resistors and low power wire wound resistors. The CAP is made of brass, fe-ni alloy and al-steel with stable chemical property and good workability. The surface of the CAP is electroplated with sn-ni Using the same wire with annealed and silver or nickel plated on the surface or the same wire as the cap as the lead wire, the cap with the lead wire is welded by butt spot welding on the spot welding machine. It is easier to spot weld cap and wire with similar properties, and the quality is also easier to control. This way is to rivet the cap cap with lead wire firmly at both ends of the resistance body. In the process of Rivet pressure, we should pay attention to the dimension tolerance fit between the resistance body and the CAP, their axial parallelism and the control of the rivet pressure Welding riveted lead clamp, using lead, clamp to complete the resistance body extraction method applies to one. These power type resistors. The quality of the material used for the lead clamp is approximately the same as that of the lead cap, except that the lead clamp is made by punching the lead clamp first and then bending it to make the lead clamp. When leading out, the resistance alloy wires and the substrate with the surface coating or oxide layer are clamped, and the lead wires are welded or riveted by rivets through the through hole on the lead wire clamp This method is used to produce glass glaze resistors. Nowadays, a lot of chip resistors are produced. Some of these resistors fall into this category. At present, the burn-out terminal has become one of the main ways of the resistor terminal. This method pays attention to the end slurry, screen leakage printing and burning infiltration process 4-terminal pressure lead, this lead-out method is dedicated to organic solid-core resistors, the main materials are tinned copper wire, high-melting lead-tin Alloy and colloidal graphite preparation. Whereas organic solid core resistors must undergo high temperature ~ 200 aging to further polymerize the resin in the plastic pressed parts, to achieve stability and to improve moisture resistance, but this process will cause tin melting or oxidation on the surface of tin-coated copper wire Seriously affecting reliability. In order to reduce and prevent the occurrence of this phenomenon, it is necessary to carry out surface coating of high-melting lead-tin alloy. High-melting pb-sn alloy is a high-pb formula, which contains 85% lead and 15% tin, and melts at about 250 °C. Generally, the tinned copper wire is winded through flux, Rosin, alcohol solution bath, lead tin bath, speed cooling, shaping wire drawing die and take-up roll. The colloidal graphite preparation coated on the end is to reduce the contact resistance between the lead wire and the resistor body. The requirement for it is that the residue is over 25% , the graphite content is not less than 21% , the 2um particle in the residue is not less than 95% , and the ash content is less. Copper wire coated with high melting lead Tin Alloy is machined to lead wire as shown in figure 4.27. The surface is cleaned with a trichloroethene to remove the surface oil thoroughly and the end graphite is finished on the applicator To ensure complete coverage of the end face of the basic figure 4.27 end-shaped lead, to the end of the side of the lead to extend about 1 ~ 2 mm coating.