The paper described the processing technology of requiring and complicated hole of the structure in high accuracy, introduced the design to process this jig and its manufacture.
论述了有较高精度要求且结构复杂孔的加工工艺，介绍加工该零件钻孔模具的设计及制作过程。
For current situation of the honing hole machining, design a simple structure and easy to produce new honing head.
针对珩磨孔加工的现状，设计了一种结构简单、易于制作的新珩磨头。
This article depicts the advantages, design calculation, structure and application of the concrete piles in men-made hole used in the industrial metallurgical building in the recent years.
近几年来冶金工业厂房工程设计均采用人工挖孔桩基础，本文论述人工挖孔桩的优点、设计计算、构造和应用。
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