Algorithm for automatic boss feature recognition and ejector sleeve design

  • Jing Wang
  • Laishui Zhou


When having boss features in the mold core, the plastic products cannot be smoothly removed from the mold core. Through ejector sleeve design, during the ejection process, the ejector sleeve can eject products to successfully leave the mold core. Under the framework of CAD software, this study developed the boss feature recognition, integrated the mold design, and automated ejector sleeve production. Based on the geometric relationship of the surfaces, edges of the core’s boss, this study summarized an algorithm to automatically recognize the boss feature by programming an algorithm. Through computer programming calculation and judgment, the proposed method can automatically recognize boss features to reduce the labeling time at the recognition stage and record the diameters of the center pin and sleeve in feature parameters. At the mold design stage, through the acquisition of its parameters, it can automatically produce a suitable ejector sleeve. Through standardized design process, it can reduce 97% of mouse clicks and design time to guide users to quickly complete the design, while reducing design errors to improve working efficiency by the automatic integration function.


Feature recognition Boss feature Computer-aided design Injection mold design 


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© Springer-Verlag London Ltd., part of Springer Nature 2018

Authors and Affiliations

  1. 1.College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjingChina
  2. 2.College of Mechanical EngineeringHenan University of EngineeringZhengzhouChina

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