Micro-drill-bit electric resistance welding process for PCB

Abstract

The invention provides a micro-drill-bit electric resistance welding process for a PCB. A workbench is provided, and automatic different-diameter plane electric resistance welding equipment installedon the workbench is further provided, wherein the electric resistance welding equipment comprises a power supply device, a blank feeding mechanism, a pressure detection device, a transmission mechanism, a pressing mechanism, a discharging mechanism and an automatic control system; and the automatic control system comprises a PLC, a drill bit blank gas conveying electromagnetic valve, a drill handle blank gas conveying electromagnetic valve, a drill bit feeding electromagnetic valve, a drill handle feeding electromagnetic valve, a drill bit pressing electromagnetic valve, a drill handle pressing electromagnetic valve, a current inductor, a discharging electromagnetic valve and a converter. According to the micro-drill-bit electric resistance welding process for the PCB, the welding efficiency and the welding quality are greatly improved, the production consumable cost is reduced, the manual labor intensity is relieved, the situation that strong light, high temperature and poisonous gasgenerated during welding of a blade part and a micro drill handle part hurt the body of an operator is avoided, and environment pollution is avoided.

Description

technical field [0001] The present invention relates to the field of PCB drill processing, in particular to a micro-drill resistance welding process for PCB. Background technique [0002] At present, the micro-drills used in PCB drilling are usually made of tungsten steel. In order to save expensive tungsten steel materials, the micro-drills are generally welded by two parts: a drill shank made of white iron steel and a drill made of tungsten steel. combined. The welding of drill shanks and drill bits includes two methods: butt joint and plug joint. Butt welding can only be applied to products with the same diameter of drill shanks and drill bits; Drill a small hole at the end, insert a tungsten steel drill bit smaller than the diameter of the drill shank into the hole, and then use the corresponding welding wire and flux to weld the circumference of the hole of the drill shank through the welding equipment, and then grind the drill bit and slotted molding. [0003] The m...

AI Technical Summary

Problems solved by technology

[0004] 1) With circumferential welding, the coaxiality between the tungsten steel and the drill shank is difficult to guarantee, and it is prone to cold cracking, desoldering, virtual welding, etc., resulting in poor welding fastness, high scrap rate, and short service life of the product;

[0005] 2) The different diameter welding of tungsten steel and drill shank needs to drill holes on the drill shank first, the process is complicated, labor-intensive and time-consuming, the production efficiency is low, and it cannot meet the needs of large-scale production and block-speed refueling;

[0006] 3) The above two methods cannot carry out the butt joint processing of tungsten steel and drill shank with a diameter below 1.3mm;

[0007] 4) During welding, welding wire and flux produce a large amount of smoke at high temperature, which pollutes the environment, and at the same time causes pollution to the machine, and also affects the welding quality, resulting in low production efficiency and increasing the cost of the entire product;

[0008] 5) During the welding process of tungsten steel and drill shank, the action control of each part is mostly controlled by mechanical transmission, and the coordination accuracy is poor, which seriously restricts the improvement of production efficiency and welding quality

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