The Temperature Field Numerical Simulation And Technological Experiment Research Of Glass Mold Laser Cladding

With the wide application of glass products,the quality requirements for glass products are also getting highly increasing.Glass mold is an indispensable equipment in the forming process of glass products.The quality and yield of glass products are directly related to the quality of glass molds.In the long-term production of glass products,there will be some defects such as wear and tear on the glass mold surface.The quality of the glass mold can be improved by the glass mold surface modification technology.But the traditional mold surface modification technology can not meet the modern enterprise production needs.As a high-tech surface modification technology,laser cladding technology is widely used in aerospace,machinery manufacturing and other fields due to its features of saving materials,environmental protection,high efficiency and high quality.In this paper,combining laser cladding technology with the surface modification requirements of glass molds,laser cladding technology is applied to complete the experimental research on the surface strengthening of glass molds.In this paper,a small bottle mold made of ductile cast iron is used as the object of the study.The laser cladding technology was used to study the process of strengthening the Ni-based alloy coating on the surface of the ductile cast iron.The main contents include:?The physical model of the pool formation in the laser cladding process was studied,including the interaction between laser and material,the formation process of the cladding layer and the internal convection of the molten pool.Based on the theory of heat transfer,the law of laser energy absorption in laser cladding is analyzed,which provides a theoretical basis for numerical simulation of temperature field.?The laser cladding process was simulated using ANSYS software,and the laser heat source model,boundary conditions,and latent heat of phase change were took into account.The "birth and kill unit technology" was used to simulate the growth process of the cladding unit during laser cladding.The simulation results show that the laser cladding process is a sudden quenching process;laser power and scanning speed need reasonable cooperation to form an effective cladding layer,otherwise it will lead to difficult formation of molten pool and surface burn of the cladding layer.The optimization of process parameters provides the basis for reducing the amount of work in the process experiment.? The platform equipment and equipment control method of synchronous powder-feeding laser cladding system were introduced in detail.Using this platform,a single-channel cladding experiment program was designed with a laser power of 2000W and a scanning speed of 5mm/s.The laser cladding of a single-channel Ni-based alloy cladding layer on the surface of ductile cast iron was completed.The experimental results show that the laser cladding processing system platform and experimental design can complete single-channel cladding experiment,and provide method and experimental sample platform for subsequent process research.?An experiment was designed to study the effect of laser cladding process parameters on the quality of the cladding layer.The influence of laser power and scanning speed on the macroscopic morphology of the cladding layer was analyzed.The laser power and scanning speed were optimized based on the dilution rate,microstructure defects,and hardness.The experimental results show that under the optimized parameters of laser power and scanning speed,the nickel base alloy cladding layer has a dilution rate in the range of 14%to 28%,less micro-structure defects,and the Boolean hardness is about the original substrate 1.5 times?Laser cladding technology was applied to the glass bottle mold by using the laser cladding processing system platform and the laser power of 2000W,the scanning speed of 4mm/s within the optimized range.The experimental results show that the use of the laser cladding processing system platform and the optimized process parameters can be applied to the surface strengthening of the glass mold.