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以流道间隙处熔体体积均匀变化为条件，对芯棒式机头的流道形状曲线参数进行分析优化，并且对几种机头导出了一套数学模型
With the uniform change of the melt volume at the gap of the runner, the parameters of the shape of the runner of the mandrel head were analyzed and optimized, and a mathematical model was derived for several handpieces