Numerical And Experimental Study Of Laser Assisted Turning Of Austenitic Stainless Steel 304

304 austenitic stainless steel has good heat resistance and corrosion resistance,and is widely used in aerospace,nuclear power and other fields.At the same time,304 austenitic stainless steel has high strength and good viscoplasticity.It is easy to produce chip sticking knife,not easy to break chips,and work hardening during cutting.This leads to poor quality of the machined surface and a large thickness of the hardened layer,which may lead to crack initiation during subsequent service and pose a safety hazard.As a multi-energy field processing technology,laser assisted machining technology is often used to solve the problem that difficult-to-machine materials are not easily processed.In order to improve the processing properties of 304 austenitic stainless steel,this paper uses laser assisted machining technology.The research contents mainly include:The temperature field simulation analysis was carried out for the process of laser assisted heat 304 austenitic stainless steel.By analyzing the results,it is found that the laser assisted technology with constant power has the following two shortcomings: First,the laser spot's temperature is affected by many factors and cannot be accurately controlled;Second,due to the heat accumulation effect,the temperature field under the laser assisted technology for a long time cannot be kept stable.Set up a closed-loop control system that realizes laser assisted heat with constant temperature to make up for the shortcomings of traditional laser assisted heat technology with constant power.First,the temperature of the laser spot is measured by an infrared thermometer and transmitted to the adjustment control unit.Then,the adjustment value calculated by the control unit is fed back to the laser generator for laser power adjustment.Finally,the laser beam heats the workpiece through the laser head to form a closed loop with constant temperature regulation.The laser assisted technology with constant temperature can make the laser spot reach the specified temperature and ensure the relative stability of the temperature field.The turning experiment of 304 austenitic stainless steel was carried out by laser assisted technology with constant temperature.In the experiment process,a large number of different process parameters were used to analyze the influence of assisted heat process parameters on cutting force,tool wear and surface quality.Through the comparison experiment,it not only confirmed that the laser assisted technology with constant temperature improved the cutting performance of 304 austenitic stainless steel,but also showed that it has advantages over the laser assisted technology with constant power.