The characteristics of laser drilling small holes on the workpiece

Laser processing of small holes uses high-energy-density laser as a heat source to make the processed material generate a local instantaneous high temperature at the processed point, and it will become a molten or vaporized state to remove the material. When the laser with extremely high energy density irradiates the surface of the processed part, the light energy is absorbed by the surface of the part and converted into heat energy, so that the irradiated local area is quickly melted and even vaporized, forming a small pit first. As the light energy is absorbed, the metal vapor in the pit expands sharply, and the pressure suddenly increases, which has a strong impact on other parts, causing the vapor and molten material to be exploded out at high speed, and the workpiece is processed. A small Kongyang with a certain taper. The characteristics of laser processing ① have nothing to do with the hardness of the material, almost can punch holes in all materials, fast, high efficiency, small heat-affected zone ② there is no problem of tool loss, almost no macro force on the workpiece, so it can be easily Holes are punched on deformed workpieces, and it is easy to realize automatic continuous operation. ③It can process fine and deep small holes. The diameter of the small hole can be as small as 4-5um, and the depth-to-diameter ratio can reach more than 10 ④ The roughness of the processed small hole is large, the roundness is not good, and it is easy to form a bell mouth, and the accuracy of the hole is generally lower than the working grade. And the effect of focusing, generally only suitable for processing small holes in thin plates. In addition, because the price of laser drilling equipment is more expensive, it also limits its application to a certain extent. Previous post: The characteristics of small holes processed by electron beam in machinery industry