The basic principle of micro tension controlling in rolling process of bar and the realization means of micro tension controlling in PLC program were analyzed.
分析了棒材轧制过程中微张力控制的基本原理，以及微张力控制在PLC程序中的实现方式。
The results of microstructure observation showed that the content of micro-alloying elements should be adjusted in order to enhance anti-seismic properties of steel bar.
微观分析和成分分析结果表明，为加强钢筋的抗震性能，微合金元素应当适当调整。
The NC boring machine equipped with this kind of deformable bar can bore special-shaped pin hole in piston efficiently, and meanwhile meet the demand of micro-meter accuracy.
装有这种新型变形镗杆的NC镗床能高效地镗削活塞异形销孔，并达到微米精度的要求。
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