摘要
胶点的一致性及是否有卫星滴是衡量喷射阀点胶质量的重要指标。为了有效地改善点胶质量,提出了一个数学模型。该模型能根据胶水特性预估其喷射所需的弹簧预压力临界值,通过调节弹簧预压力使喷射速度在临界喷射速度附近,从而达到去除卫星滴和改善胶滴一致性的目的。首先建立了气缸模型和点胶模型,以仿真手段获取点胶过程中撞针受到的胶液阻力和气体阻力;再依据能量守恒定律和喷射理论得出所需的驱动能量,从而计算出所需弹簧预压力;最后通过实验验证了模型的有效性和点胶质量改善方式的可行性,通过该实验获取了直径为0.45 mm,一致性误差小于5%的胶滴。
The consistency and the quantity of satellite droplet are important indicators to the jetting quality. In order to improve the jetting quality effectively,a mathematical model was established. The model can estimate the spring preload which is required for critical jetting,adjust the injection speed close to the critical jetting velocity by adjusting the spring preload,which can avoid satellite droplet and improve the glue dot consistency. Firstly,the cylinder model and the jetting model were established to obtain the glue resistance and gas resistance which will block the movement of pin. And then,the drive energy and the spring preload can be obtained base on the jetting theory and the energy conservation theorem. The availability of the model and the feasibility of the jetting quality improving method were verified. Finally,experimental obtained glue dots with diameter of 0. 45 mm without any satellite droplet which consistency error is under 5 %.
引文
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