Laser Welding Method of Vibration Motor Shrapnel and Mass Block

Abstract

The invention discloses a laser welding method of a vibrating motor shrapnel and a mass block, which comprises the following steps: 1) using CCD vision to precisely locate the welding position; 2) setting an M-shaped welding waveform: slowly increasing the energy for a period of time , reduce the energy, then increase and maintain it for a period of time, and finally decrease to zero; 3) find out the focus position of the focusing mirror and the distance between the focusing mirror and the workpiece; 4) adjust the focus of the focusing mirror to below the surface of the workpiece, and Adjust the focus position of the laser step by step to make it downward and away from the surface of the workpiece until there is no spatter in the welding and the welding strength meets the requirements. The invention adopts the CCD visual positioning method to ensure that the position accuracy of the solder joint reaches 3 wires, and ensures the repeated positioning accuracy of the solder joint in the production process. Using the welding method of M-shaped waveform and negative defocus, the strength of a single solder joint can reach 3 The requirement of kilograms, and the appearance of solder joints is smooth and flat.

Description

technical field [0001] The invention belongs to the technical field of laser welding, and in particular relates to a laser welding process method for a shrapnel and a quality block of a vibration motor. Background technique [0002] Vibration motors are widely used in mobile phones, tablet computers or environments that require vibration to achieve vibration functions, instead of sound prompts, so as to avoid disturbing others or generating noise. The mass blocks, shrapnel and stoppers in the vibration motor need to be overlapped together and require high strength. Ordinary welding methods are difficult to meet the strength requirements, so laser welding must be used, and a large number of general laser welding uses Nd:YAG lasers, and Nd:YAG lasers consume a lot of power, occupy a large area, and have poor energy stability. Meet the precision welding requirements of vibration motors. [0003] As the volume design of the vibration motor becomes smaller and smaller, the weld...

AI Technical Summary

Problems solved by technology

The general laser welding process is difficult to meet the requirements of welding strength and appearance. Due to the high melting point of tungsten-nickel alloy steel, positive defocus welding (laser focus is above the surface of the workpiece) is used, and the penetration depth of the solder joint is low and the strength is not enough.

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