Process Knowledge Of Precision Metal Processing

1. Precise hardware processing applies a positive pressure on the front of the workpiece (for example, air blowing), or installs a low pressure chamber on the discordance of the workpiece, which can help to remove vaporized data and increase the discharge of liquid phase during the drilling process. . After the pulse is completed, the weakened melt will be re-distributed uncontrollably, which will affect the size and shape of the hole, and the surface quality of the processed hole (such as a layer of molten metal on the inner wall of the hole) The thickness of the "recast layer" is effectively reduced), and can prevent metal vapor from condensing on the lens.

　　2. Precision metal processing uses thick liquid film or metal aluminum foil to cover the workpiece, which can reduce the taper of the hole and avoid liquid splashing. For example, petroleum can reduce the accumulation of melt at the entrance and exit of the hole, and silicone oil can reduce the taper of the hole.

　　3. In order to prevent the melt from accumulating in the hole in time, the material whose vaporization temperature is lower than the melting temperature of the processed material can be placed behind the processed workpiece. At present, white wax, glycerin, snow melt oil and so on are used.

　　4. Precise hardware processing. The workpiece with high reflectance and transmittance can be processed appropriately before processing, such as roughening or blackening, to increase the absorption rate of the laser. Some additional technological measures are adopted.