Laser hardening robot

Laser quenching has high power density, fast cooling speed, no need of water or oil and other cooling media, is a clean and fast quenching process.  And induction hardening, and flame hardening, carburizing and quenching process, compared with laser quenching hardened layer, high hardness (generally higher than induction hardening 1-3 HRC), small deformation, heating depth and heating trajectory is easy to control, easy to realize automation, don't need like induction hardening according to different design of the corresponding component size induction coil,  The processing of large parts does not need to be carburized quenching and other chemical heat treatment furnace size restrictions, so in many industrial fields are gradually replacing induction quenching and chemical heat treatment and other traditional processes.  Especially important is that the deformation of the workpiece before and after laser quenching can be almost ignored, so it is especially suitable for high precision parts surface treatment.  

The depth of the laser hardened layer is generally between 0.3 mm and 2.0mm, depending on the component composition, size and shape, and laser process parameters.  When the tooth surface of large gear and the journal of large shaft parts are quenched, the surface roughness is basically unchanged, and it can meet the needs of actual working conditions without subsequent mechanical processing.  
Laser melting quenching technology is the use of laser beam to heat the surface of the substrate above the melting temperature, due to the internal heat conduction cooling of the substrate, the surface of the melting layer is rapidly cooled and solidified.  The obtained melt-quenched microstructure is very dense, and the microstructure along the depth direction is in order of melt-solidification layer, phase change hardening layer, heat affected zone and substrate.  Laser melting layer has deeper hardening depth, higher hardness and better wear resistance than laser quenching layer.  The disadvantage of this technique is that the roughness of the workpiece surface is damaged to a certain extent, which generally needs to be restored by subsequent machining.  In order to reduce the roughness of the parts surface after laser melting treatment and reduce the amount of subsequent processing, Huazhong University of Science and Technology has prepared special laser melting quenching coating, which can greatly reduce the surface roughness of the melting layer.  The surface roughness of rolls, guides and other workpieces of various materials in metallurgical industry treated by laser melting has been close to the level of laser quenching.