过孔是印刷线路板（也称为印刷电路板）的重要组成部分之一，过孔的加工费用通常占制板费用的30 到40 ，打孔机主要用于在制造印刷线路板流程中的打孔作业。本问题旨在提高某类打孔机的生产效能。-Vias are printed circuit boards ( also known as a printed circuit board) is one of the important components, holes machining cost usually accounts for30 of