Study On The Mechanism And The Parameters Optimization Of Welding Cartridge Case

The welding steel cartridge is an integral part of artillery weapon system.In the process of projectile launching,the good air tightness and the smooth extraction of the cartridge is an important guarantee for the safe launch of the projectile.Therefore,it is of great theoretical significance and practical value to study the gas mechanism and extraction mechanism of the cartridge case.The main content of this paper is dynamic welding steel cartridge in the gun barrel in response to.Firstly,the mechanism of cartridge closure is theoretically analyzed and the stress change of cartridge case is calculated.According to the interaction process of the cartridge and the barrel,the mathematical model of the cartridge and tube is established.The force process of the cartridge is analyzed by using the elastoplastic theory and the axisymmetric theory,and the dynamic response of the cartridge is simulated and studied.Secondly,the influence of temperature is neglected in the traditional study.In this paper the heat transfer process and thermal deformation of the cartridge are discussed.Basing on the heat transfer characteristics of cartridge material properties,the dynamic response of the welding steel cartridge under the coupling of high pressure and thermal shock is studied.The simulation results show that the thermal shock the cartridge extraction force is increased by 16%.Thirdly,using the APDL(ANSYS Parametric Design Language)language is to establish welding cartridge and the barrel of the parametric model.The influence of the wall thickness of the cartridge,the initial gap of the cartridge and the corner of the inner wall of the cartridge on the extraction force of the cartridge is analyzed.At the same time,the influence of the pressure on the bore time and the pressure of the cartridge bore is analyzed.The solutions are the change characteristics of the wall thickness,the initial clearance and the inner wall angle are obtained,and the change law of the chamber pressure and the chamber time and pressure are obtained,and get theirs range of values.Finally,the Isight optimization platform is set up.Based on the Latin Hypercube sampling method,the particle swarm optimization algorithm is used to optimize the wall thickness and initial gap of the barrel,which was more important to the closure of the cartridge and the extraction.The optimization results show that the cartridge thickness is 1.875mm and the initial gap is 1.452mm,the minimum extraction force is required.The research results in this paper are of theoretical value and reference value for the design of welding steel cartridges.