注塑模具随形冷却管道自动生成技术

Automatic generation technology of conformal cooling channels for injection mold

作为一种新颖的水路结构,随形水路以其优越的冷却效果在模具工程中得到了越来越多的应用。然而由于随形水路的特殊性,其管道的创建过程并不容易。针对注塑模具随形水路传统设计方法中普遍存在的操作复杂耗时且易出错的问题,受莲藕内部导管结构的启发,结合实际模具工程中随形水路的设计要求,提出了一种随形水路自动生成算法。该算法的基本思路是首先沿模具型芯高度方向建立一系列基准面,作为切片层,通过对模具零件进行分层切片,获得每一个切片层上的型芯轮廓线。然后在每一个切片层上以指定管径按照逐点扫描的方法进行曲线干涉检查,筛选出样条曲线的控制点,并制定连线策略使用样条曲线依次连接各个切片层上的控制点,从而获得样条曲线。最后以样条曲线作为管道扫描中心线,扫描形成随形冷却管道实体。以NX为算法实现平台,开发了随形水路自动设计系统与NX无缝衔接,实例验证表明,该方法大幅度缩短了设计时间,减轻了设计人员的工作负担,提高了随形水路的设计效率和质量。

As a novel cooling channel structure,the conformal cooling channel has been increasingly applied in mold engineering due to its superior cooling effect.However,due to the particularity of the conformal cooling channel,the process of creating its pipes is not easy.Aiming at the common problems of complex,time-consuming,and error prone operation in traditional design methods for injection mold conformal cooling channel,inspired by the internal conduit structure of lotus roots and combined with the design requirements of conformal cooling channel in actual mold engineering,a conformal cooling channel automatic generation algorithm was proposed.The basic idea of this algorithm was to first establish a series of reference planes along the height direction of the mold core as slicing layers.By slicing the mold parts layer by layer,the contour lines of the core on each slicing layer were obtained.Then,on each slice layer,a curve interference check was performed using a point by point scanning method with a specified pipe diameter.The control points of the spline curve were selected,and a connection strategy was formulated to sequentially connect the control points on each slice layer using the spline curve,thereby obtaining the spline curve.Finally,a spline curve was used as the centerline for pipeline scanning to form a solid shape of the cooling channel.Using NX as the algorithm implementation platform,a seamless connection between the automatic design system of cooling channel and NX has been developed.Example verification shows that this method significantly shortens the design time,reduces the workload of designers,and improves the design efficiency and quality of shaped waterways.