Methods for calculating expanded size of punched hole and compression punching type are introduced.
简述抽孔、压缩抽型的展开时几种情况下的计算方法。
The test mostly analyse the film mulching hill-drop planter from two aspects: One is mechanism of duck-mouth type punching-opener, One is analyse of metering device .
本文主要从两个方面对覆膜穴播机具进行分析：一是鸭嘴式成穴器的成穴机理；二是外槽轮式排种器的分析。
Punching through, the top pieces, such as the discharge of calculation to determine the type mold.
通过冲裁力、顶件力、卸料力等计算，确定模具类型。
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