Soldering method of ABS (Acrylonitrile Butadiene Styrene) rectifier bridge

Abstract

The invention discloses a soldering method of an ABS (Acrylonitrile Butadiene Styrene) rectifier bridge. The method comprises the following steps of: filling a layer of core grains and a layer of soldering flakes in a first presoldering boat, wherein the core grains are arranged on the lower layer, the soldering flakes are arranged on the upper layer, the P surfaces of the core grains are upward, and a second presoldering boat is covered on the first presoldering boat after the core grains and the soldering flakes are filled; placing the two combined presoldering boats in a soldering furnace to heat, presoldering the soldering flakes and the core grains, fusing the soldering flakes after the soldering flakes are heated to form a solder ball shape, adsorbing the soldering flakes in centers of the core grains to form soldering points, and placing the core grains into a vessel for later use after the two combined presoldering boats are taken out of the furnace and cooled; fixing an upper material flake and a lower material flake on a locating plate, after dispensing solder glue on planes of the upper material flake and the lower material flake, prefixing the presoldered core grains after placing the presoldered core grains on surface points of the upper material flake and the lower material flake by using a pipette, and carrying out die assembly after moving the upper material flake and the lower material flake onto a graphite boat. According to the invention, the core grains are accurately located in a way of presoldering the single surface of each core grain, the deviation of core materials is avoided, and the electrical property of a soldered rectifier bridge is ensured.

Description

technical field [0001] The invention relates to a welding method for an ABS rectifier bridge. Background technique [0002] The ABS rectifier bridge is composed of upper and lower chips and core particles, and the core particles are fixed on the upper and lower chips by welding. At present, the welding method of ABS rectifier bridge is: install the frame by double-sided dispensing, that is, use a dispensing machine on the dispensing positioning plate to apply tin glue to the planes and bumps of the upper and lower sheets of the rectifier bridge At the same time, divide the core particles on the core particle spreading plate, and then use the suction pen to absorb the core particles on the spreading plate on the plane of the sheet, then move to the graphite boat for mold closing, and finally close the graphite boat Put the cover plate into the welding furnace. In the above process, there are certain problems in the dispensing process: in the dispensing process, because the ...

AI Technical Summary

Problems solved by technology

In the above process, there are certain problems in the dispensing process: in the dispensing process, because the bumps on the blank are particularly sensitive to height differences, the deviation of the two wires will generally affect the dispensing amount to a large extent; at the same time During the dispensing process, due to factors such as the shaking of the dispensing needle, the accuracy of the dispensing base plate, the accuracy of the positioning plate, and the accuracy of the bumps of the material, the solder glue cannot accurately cover the center of the bumps, and the height of the glue injection will also deviate. The difference in the amount of glue is obvious, which leads to the deviation of the core particles from the center of the bump, which reduces the quality of the welding rectifier bridge. Even the tube is broken, and too much glue can easily lead to pole connection

[0003] In addition, solder flux is added to the tin glue. Since the flux and tin glue are dissolved together, the rosin and other substances in the flux are difficult to volatilize during the soldering process. Therefore, watermarks and watermarks are generated on the surface of the rectifier bridge during the molding process. The pockmarked surface has an impact on the appearance of the rectifier bridge