Numerical Simulation Of Internal Temperature Field Of Arc Source In Multi Arc Ion Coating Machine

Ion plating is one of the most widely used and most advanced surface treatment technologies,Multi arc ion plating is one of the most outstanding.According to an uncompleted statistic,more than half of the surface treatment at home and abroad using multi arc ion plating technology.After certain development,the technology of multi arc ion plating is becoming more and more mature,but there are still some problems,in the actual industrial production process,the large particle size on the surface of the coating is always a major obstacle to technological progress,the root cause of this phenomenon is that the target is overheated due to the excessive concentration of arc spots.The effective method to reduce the droplet is to reduce the discharge power density,improve the speed of the spot movement,increase the ionization rate,and strengthen the cooling measures,so it is very important to improve the cooling effect of the target surface.In this project,the temperature field of arc source of multi arc ion plating machine is simulated and analyzed by CFD method,and the influence of different factors and structure on the cooling effect of target surface is studied.Based on the ANSYS-CFX platform,a numerical simulation model was established for the arc source of the multi-arc ion plating machine.The internal structure of the cooling copper sleeve,the stainless steel sleeve,the target material and the internal cooling water were analyzed by fluid-structure interaction.The simulated average temperature of the target surface is almost the same as the actual temperature,indicating that the calculation result is reliable.The effect of cooling water at different temperatures and different velocities on the cooling effect of the target surface is investigated and analyzed in this paper.The simulation results show that the average temperature of target surface is linear with the inlet temperature and inlet velocity of cooling water.The lower the cooling water temperature and the faster the flow speed,the lower the average temperature of target surface.This indicates that when conditions permit,reducing the temperature of cooling water as much as possible and improving the entry speed of cooling water will play a positive role in the cooling of target surface.Meanwhile,the influence of the thickness of the bottom of the cooling copper sleeve on the cooling effect of the target is studied.The simulation results show that when the thickness of the bottom of the copper sleeve decreases,the temperature of the target surface will also decrease.In addition,analyzing the influence of the structure of internal cooling water circulation system of arc temperature field of the target,to adjust the structure of the original cooling system,in the same condition,the adjusted model is compared with the original model,the average value of the target surface temperature decreased,the cooling uniformity is better.In addition,the effect of the motion of the arc spot on the temperature field of the target surface is also simtulated.The simulation results show that the temperature range of the target surface arc spot trajectory at 250 C to 1495 C,and any point on the path from the maximum temperature decreased to the minimum value of 0.027 seconds,the said arc spot on the target surface should not be continuous through any one point two times during this time,otherwise it will cause too much this point the temperature affects the coating effect.