Deep Hole Drilling Test And Parameter Optimization Of Nuclear Power Tube

As a clean,low-carbon,stable and cost-effective energy-efficient energy source,nuclear power will change China’s energy structure and achieve the object of energy conservation and emission reduction.Therefore,mastering nuclear power production technology is vital.The tube plate is a key component of the steam generator.There are hundreds of processing holes required for the tube sheet.These processing holes have large depth-to-diameter ratios,which are prone to serious tool wear and low processing quality.These problems restrict the development of nuclear power equipment technology.In this paper,the research on deep hole processing of nuclear tube sheet is carried out.The influence of cutting parameters on cutting force and surface roughness of machined hole wall is analyzed.The cutting parameters are optimized based on regression equation to lay the foundation for efficient and high quality processing of nuclear power tube panels.The main research work of this paper is as follows:(1)By analyzing the structural characteristics of the nuclear power tube board of Harbin Electric Corporation and the requirements of deep hole processing,the processing machine tools and clamping methods required for the deep hole processing system of nuclear power tube board are determined;In view of the characteristics that the chips are not easy to be discharged during the processing of the nuclear tube sheet,the depth is extremely large and the cutting force is large,this paper determine the type and geometric parameters of the drill bit required for drilling and the deep hole processing system of the nuclear tube sheet is completed.(2)Combined with the existing tube sheet processing characteristics and based on the built-up nuclear tube sheet deep hole processing system,this paper designed the deep hole processing test of nuclear tube sheet and analyzed the spindle rotation speed and feed rate for the drilling force and the rough surface of the machined hole wall.The empirical model of drilling force and surface roughness was established by multiple linear regression method and the empirical model was tested.(3)According to the cutting force,surface roughness and production efficiency requirements of the nuclear tube sheet production process and combined with the deep hole processing system’s own conditions,this paper determined the multi-objective optimization model;The multi-objective particle swarm optimization algorithm is used to solve the optimization model,and the optimal cutting parameter combination is obtained.The machining results of the cutting parameters are verified by experiments.