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  fixed roll
Estimations during tracking, when otolith information was continuously changing, were more precise compared to estimations following fast tilts to fixed roll tilt positions.
      


The purpose of this paper is to make clear the mechanism of deformation in wire drawing through three roller dies. Having introduced the numerical method, the drawing process, including drawing force and roll force, has been theoretically analyzed. In addition, the distribution characteris tics of mean stresses and mean strains in the deformation zone have been investigated. The results are as follows.1. The experimental results were in good agreement with the theoretical analysis.2. Drawing condition...

The purpose of this paper is to make clear the mechanism of deformation in wire drawing through three roller dies. Having introduced the numerical method, the drawing process, including drawing force and roll force, has been theoretically analyzed. In addition, the distribution characteris tics of mean stresses and mean strains in the deformation zone have been investigated. The results are as follows.1. The experimental results were in good agreement with the theoretical analysis.2. Drawing condition affects drawing force and roll force, in which the effect of back pull is large but the effect of lubrication is small. Drawing force under free roller dies drawing is much smaller than that under fixed rolls drawing.3. The rate of breadth spread is affected by drawing condition. The rate of breadth spread under free roller dies drawing is larger than that under fixed rolls drawing.4. The distribution of stresses and strains in the deformation zone under roller dies drawing is different from that under fixed rolls drawing, but tends towards rolling.5. The (?)4.0 mm ribbed bars have been drawn through three roller dies.

本文对三辊辊模拉拔的变形力学问题进行了研究。通过引入数值解析法对辊模拉拔的辊拉力和辊压力进行了理论解析。同时,对变形区内的应力应变分布特征作了较详细的分析。现论解析和实验结果表明: 1.实验与理论解析的结果一致。 2.拉拔条件对辊拉力和辊压力有影响,其中,后张力影响较强,润滑条件影响较弱。辊模拉拔辊拉力明显小于固定辊模拉拔。 3.辊模拉拔的宽展受拉拔条件影响,自由辊模拉拔宽展大于固定辊模拉拔。 4.辊模拉拔变形区内的应力应变分布特征完全不同于固定辊模拉拔,而倾向于轧制过程。 5.进行了三辊辊模拉拔螺纹钢筋的实验,拉出了φ4.0mm螺纹钢筋。

The control of the precision of rolling axis is the difficu lt y and emphasis in fix site of continue rolling mill. This paper uses the theory of fixing a size chain to analyze the fix rolling axis and tolerance and to disc uss the practice of the reality,and introduces the DANIELI's small model continu e rolling mill eqipment used in Shaoguan Iron and Steel Group Co.,Ltd

轧制中心线安装精度的控制是连轧机组安装施工中的重点与难点 .本文以韶钢达涅利小型连轧设备安装为例 ,从分析轧制中心线及其公差组成入手 ,运用安装尺寸链理论 ,联系实际进行探讨 .

The pressure value on the taper sleeve during fixing roll ring of cantilevered mill for high speed wire rod was calculated by analyzing the balance of force and moment of the taper sleeve So,the problems of roll collapse and loose can be avoided,which caused by large and small pressure on the taper sleeve

通过对高线悬臂式轧机辊环安装固定中锥形套的受力分析 ,计算了加压工具的加压值 ,从而避免了加压过大造成崩辊 ,加压过小造成松辊的问题

 
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