铝合金轮毂低压铸造充型非线性压力条件

Non-linear Pressure Condition in Filling of Aluminum Alloy Wheel in Low Pressure Die Casting

在铝合金轮毂的低压铸造充型过程中,压力条件是影响压铸质量的主要因素。提出了低压铸造充型非线性压力条件的加载方法。结合线性与非线性压力加载的数值模拟,分析与验证了非线性压力条件的有效性,详细说明了压力条件对充型状态的影响,以及缺陷的形成。对于复杂轮型,非线性压力条件可以获得稳定充型状态;充型前流进入型腔后,可适当提高压力加载速度;在轮辐与轮辋下缘充型时,加载速度应较平缓;在轮辋部分的上升充型中,压力加载速度再次适当提高。研究表明,非线性压力条件可以有效地减少压铸充型缺陷,提高复杂轮毂的成品率;在保障前流稳定的情况下,可以通过数值模拟与试压铸而获得合理的非线性压力条件。

In process of low-pressure die-casting filling for aluminum alloy wheel, the pressure condition is the key influential factors for quality. A method of non-linear pressure load was put forward. Based on the simulation of linear pressure and non-linear pressure, feasibility of non-linear pressure was validated, and effects of pressure condition on filling process and defects in die casting were described. Steady filling process can be realized by applying non-linear pressure to wheel with complicated cavity. Pressure-applying velocity can be properly increased after front-flow fills the cavity. The pressure should be increased gently in the filling of wheel spoke and lower half-space of wheel rim, while in the rising filling process of wheel rim, the pressure-applying velocity can be increased once again. The results indicate that non-linear pressure condition can greatly reduce defects in filling process to improve the qualified product rate of complicated wheel. The rational non-linear pressure condition can be realized by numerical simulation and trial die-casting under the condition of keeping steady front-flow.