Contactor static contact silver plating process

Abstract

The invention discloses a contactor static contact silver plating process. The contactor comprises a ceramic shell, an output end and a screw rod, wherein the output end is provided with a flange, andthe output end is embedded into the ceramic shell and is limited by the flange; a first solder sheet is arranged between the lower surface of the flange and the ceramic shell; the screw rod is arranged on the output end; the screw rod is sleeved with a second solder sheet; the second solder sheet is attached to the upper surface of the flange, and the second solder sheet does not exceed the edgeof the flange; the contactor is subjected to integral furnace brazing; the first solder sheet is melted to realize brazing fixation of the ceramic shell and the output end; and the second solder sheetis melted to realize silver plating on the upper surface of the output end. According to the process, a traditional surface electro-silvering mode is abandoned, and a solder sheet is directly placedat the position of a static contact, and brazing at the two positions of the output end is carried out at the same time, so that the complex electroplating process is omitted, the requirement for contact protection is met, the cost is controlled, and the efficiency and the qualified rate of finished products are greatly improved.

Description

technical field [0001] The invention relates to a silver plating process for a static contact of a contactor. Background technique [0002] Such as figure 1 As shown, the contactor includes a ceramic shell 1, an output end 2 and a screw rod 3, wherein the ceramic shell 1 and the output end 2 are usually fixed by brazing, and the screw rod 3 is installed on the output end 2 through threads, and the output end The upper surface of 2 is the static contact 4. The silver plating on the contacts is mainly to protect the integrity of the contacts, avoid arc damage, adhesion, and oxidized contacts caused by excessive current at the moment of switching on and off. In addition, the metal surface of the contacts will accumulate scale over time, resulting in increased contact resistance. Large, and silver will not affect its conductivity, reducing the possibility of arc ablation contacts, so the silver plating process is very important. [0003] On the basis of traditional technology...

AI Technical Summary

Problems solved by technology

[0003] On the basis of traditional technology, if silver is electroplated on the static contact first, and the electroplating silver needs to be cleaned by chemicals, and then put into the furnace for brazing, the silver electroplated on the static contact will pollute the vacuum or hydrogen at high temperature environment, which is very unfavorable to the brazing equipment; if the method of brazing first and then silver plating is adopted, since the actual situation is that only the upper surface of the output end is the silver plating area, this puts forward requirements for the quality of the silver plating, and a tooling is required to The place that does not need to be silver-plated is isolated for partial silver-plating. Once plating occurs on the wrong place, such as the ceramic shell, this irreversible situation will seriously affect the quality of the finished product, resulting in a low pass rate

Images