Technology And Device Research Of Magnesium Alloy Wheeled Combat'S Wheels Hub On Spinning Forming

Due to the strategic mobility of wheeled combat vehicles, operational and supportcosts low, long-distance deployment is more convenient features, therefore the world'smilitary powers attached great importance to the development of new wheeled combat.Wheels as the chariot moving parts have a larger impact on their carrying capacity andoff-road.Considered lightweight angle from the weapons and equipment, combined with thespecial requirements of the wheeled chariot wheels. If the magnesium alloy material tomanufacture the chariot wheels, not only to reduce the chariot weight and increase payloadcapacity, but also to improve the chariot maneuverability and off-road. However, there aremany shortcomings seriously hindered its development in the production and application.This paper presents a full immersion isothermal squeeze spin forming technology; itset the spin forming and extrusion of the advantages of combining. That is a way toimprove product performance, and improve material utilization of advanced manufacturingtechnology.Based on the analysis of the chariot wheels of isothermal squeeze spin formingprocess characteristics, by elastic-plastic finite element theory, completed athree-dimensional model. Deform finite element numerical simulation of AZ80 magnesiumalloy wheels. The forming process of magnesium alloy wheels, squeeze roller and wheelsnever come into contact with the contact state, from the point of contact into line contact,the gradual increase in contact area. Due to the increase of the deformation zone, thedeformation path is more reasonable, uniform deformation. These improve the formingwheel performance, and improve the machining accuracy.Forming process to simulate by squeeze spin the wheel of the chariot in the differentprocessing parameters, the temperature T, the feed rate (radial) f, squeeze roller diameterΦand the spindle speed n, which on the squeeze spin deformation is greater impact. As the main experimental factors, the use of orthogonal experiment method to design a testprogram for optimization of process parameters design. has been one of the bestcombinations of process parameters, Temperature T = 380°C, feed rate f = 1.5, squeezeroller diameterΦ= 90mm, spindle speed n = 120 n / min, forming wheels of good quality.In order to clearly understand the deformation mechanism squeeze Spinning along thewheel wall thickness and longitudinal and circumferential take points, changes in thestress-strain curve ,found that: (1) metal forming, mainly in the radial motion, whichcomplete wheels precision forming; (2) no relative motion on tangential; (3) the axial wheelinner and outer surfaces in relative motion, resulting in increased wall thickness, which cancause the wheels expanding and punch phenomenon. In order to quantitatively find outchange of the wall thickness, simplified the wheel forming process, and the establishmentof a mathematical model between the wheels of wall thickness and wall thickness variation,and provides a basis to improve the wheel forming precision.In order to meet Squeeze Spinning thermostat requirements, magnesium alloy wheelprocessing allowed all immersed in a liquid medium. Create squeeze spinning model forfluid simulation by Fluent. The simulation results show that the existence of the pressurefield in the squeeze roller and the wheel gap, resulting in negative pressure and the smallerthe gap the negative pressure the greater, which is very beneficial to the wheel lubrication.Speed trajectories, that the overall flow state was turbulent state by squeeze the roller andbracket blocks. So that is conducive to the thermostatic tank of liquid heat transfer toensure the consistency of the overall temperature in the tank.Develops squeeze spin forming device for full immersion isothermal extrusion rotaryforming process, with a focus on design of the spindle assembly, the main processequipment and bath structure. according to Fourier's law, establish"the value of thethermal conductivity curve"model, whenδ= 70mm is the optimum insulation thickness.Device control system takes AT89C52 microcontroller as the controller. Circuit selects thetraditional PID control and fuzzy control method of combining, select the control methodbased on change in error, complete the overall design of control systems. Improve the control precision, enhanced resistance to high temperature and vibration interference.Finally, the simulation analysis of the process parameters as a basis for the test, testresults and simulations consistent, indicating the forming technology and device design isfeasible, which can achieve precision forming of magnesium alloy wheels. Whichmagnesium alloy wheels production technology and device promotion provides the basis toprovide ideas for lightweight wheeled combat vehicles.