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介绍了辊模拔制异型钢管的特点,进行了辊模拔制和固定模拔制试验,试验证明,辊拔工艺可显著降低拔制力,提高异型钢管表面质量。 相似文献
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利用主应力法解析了辊拔内直筋管的拔制力,并得到其解析解。该解比冷拔内直筋管的主应力解和冷拔实测值低许多。可为辊拔内直筋管设备选择提供依据。 相似文献
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此文利用连续速度场解析了圆管辊拔减径问题的拔制力,并获得上界解析解。该解与圆管辊拔实验结果比较表明,两者吻合较好。因而,该解析解可在工程上计算圆管辊拔拔制力时推广应用。 相似文献
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铝箔精轧机弯辊力计算 总被引:1,自引:1,他引:0
本文以K.N.Shohet的影响函数法为基础,建立铝箔轧机辊系变形模型,结果与下土桥渡文章进行比较。并指出了支承辊长小于工作辊时,工作辊弯辊力对辊缝的与通常所知相反的影响结果。 相似文献
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矫直辊曲线及调整角度计算程序 总被引:1,自引:0,他引:1
简述了矫直辊辊形曲线计算原理,并作了定性分析;根据解析法与椭圆法归纳出辊形曲线程序设计的数学模型联;计算出了各种钢管对应的矫直辊调整角度。 相似文献
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《塑性工程学报》2016,(6):94-100
针对某厂5 000mm CVCPlus厚板轧机操作侧和传动侧轧制力偏差过大的问题,基于ANSYS/LS-DYNA,建立了CVCplus厚板轧机有限元模型,仿真分析了轧辊交叉角、窜辊和非对称弯辊力对两侧轧制力偏差的影响;同时对现场轧制过程进行跟踪测试和数据分析,结合仿真和实验结果研究了该厚板轧机轧制力偏差与轧辊交叉角、非对称弯辊力、轴向力和窜辊的关系,结果表明:非对称弯辊力与轧制力偏差具有明显的正相关性,弯辊力偏差100t时,轧制力偏差超过100t;当轧辊交叉角0.131°时,轧制力偏差明显增大,并且随轧辊交叉点的移动,轧制力偏差进一步恶化;轧制力偏差较大时,产生较大的下工作辊轴向力,最大可达290t,且上下工作辊轴向力呈非对称分布;轧辊窜辊与轧制力偏差具有一定的正相关性,轧辊窜辊量越大轧制力偏差越明显;从而确定了非对称弯辊力、轧辊交叉角和窜辊依次是该厚板轧制力偏差产生的主要原因。最后,针对现场实际情况,提出了轧制力偏差抑制措施,使现场轧制力偏差控制在100t范围内,控制效果良好。 相似文献
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为掌握十八辊轧机板形调控性能,运用非线性有限元软件MARC建立了十八辊轧机轧制过程三维弹塑性耦合有限元仿真模型。分析了施加-335~490 kN的中间辊弯辊力及中间辊横移量为-125~125 mm时,屈服强度为980 MPa带钢的二次凸度和四次凸度以及工作辊有载辊缝、弹性弯曲、弹性压扁变形的变化情况。结果表明,中间辊弯辊力对承载辊缝的调节能力明显大于中间辊横移量。中间辊弯辊力的二次凸度调节量约为238μm,四次凸度调节量约为78μm。中间辊横移量的二次凸度调节量约为6μm,四次凸度调节量约为2.7μm。中间弯辊力对工作辊边部弹性弯曲与弹性压扁的调控效果明显大于对工作辊中部的调控效果。中间辊横移量对工作辊弹性弯曲与弹性压扁调节能力明显小于中间辊弯辊力,说明了中间辊横移量对承载辊缝和板凸度调节能力小于中间辊弯辊力。 相似文献
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二连式Y型三辊辊模空拔钢管研究 总被引:1,自引:0,他引:1
研究了利用二连式Y型三辊辊模拉拔钢管生产新技术。与常规固定模空拔相比,新技术改变了变形区的摩擦条件、速度条件和变形条件,改善了金属变形的不均匀性,减小了金属与模具间的摩擦,致使拔后钢管残余应力明显降低。 相似文献
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Jan W. Pilarczyk Henryk Dyja Bogdan Golis Elzbieta Tabuda 《Metals and Materials International》1998,4(4):727-731
In the work the effect of application of roller dies in process of drawing of high carbon steel wires for their structure,
texture, residual stresses, surface roughness and mechanical properties has been investigated. Among structural features alignment
of cementite lamellae to the wire axis by means of SEM and Pericolor 1500 has been quantitatively determined. Degree of cementite
lamellae fracture in colonies parallel to wire axis has been estimated by Langford method. Obtained results were compared
with those structural features for conventionally and hydrodynamically drawn wires. It has been found that degree of alignment
of cementite lamellae in wires drawn in roller dies was smaller than in wires drawn conventionally and hydrodynamically but
in the case of fracture degree the opposite result was noticed. Residual stresses were determined by electrochemical reversal
pickling in water solution of sulphuric acid. A significant drop of longitudinal residual stresses in surface layer of wires
drawn in roller die has been observed as compared to those stresses for conventionally and hydrodynamically drawn wires. Surface
roughness of wires was measured with FORM TALYSURF profilographometer. It has been proved thad roller die drawing has formed
very smooth surface with much smaller longitudinal and circumferential roghness parameters that for surface of wires drawn
conventionally and hydrodynamically. In the work the tensile, yield and fatigue strength of tested wires were determined.
It has been concluded that roller die drawing has many advantages as compared to conventional process and should be implemented
in wire industry for larger scale. 相似文献
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借助有限元软件ABAQUS6.5模拟研究20碳钢作基管、316L不锈钢作内衬管的双金属复合管的拉拔成形过程,分析稳定拉拔阶段成形区内轴向、径向和环向应力的分布,找出拉拔后衬管出现横裂、纵裂及模具受磨损的原因,探讨拉拔力和内外管间残余接触压力的分布规律.通过正交实验法进一步研究拉拔参数(模具锥半角α、过渡圆弧半径r、定径带长度l、摩擦因数μ、拉拔速度v、模具直径d)对拉拔20/316L双金属复合管的影响,采用极差和方差分析法对模拟结果进行分析,得到复合管在最大残余接触压力条件下的最优拉拔工艺参数(α=11-、r=3 mm、l=7 mm、μ=0.05、v=0.03 m/s、d=17.3 mm)及各因素对分析指标的影响规律.在此基础上对优化方案进行数值模拟,模拟结果表明了正交实验对拉拔复合管参数优化的有效性.应用拉拔试验表明,参数优化后的硬质合金拉拔模具的工作寿命比未优化前硬质合金模具的工作寿命高出6倍. 相似文献
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介绍了一种实用新型专利--组合式短应力线预应力辊式模的结构特点和原理,分析了模具零件的3种不同的爱载情况,并提出短应力线预应力辊式模具的刚度计算公式。 相似文献
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The punch load and strain distribution of two deformed sheet steels, aluminum killed drawing quality steel (AKDQ Bare) and
electro-galvanized drawing quality steel (AKDQ E.G.), are examined under the various process conditions including, die materials,
punch speed, blank holding force, drawbead height and lubricant. The punch load and strain distribution ot Bare sheet steel
forming is higher than that of E.G.sheet steel on the Kirkesite die set and are reversed on the GM 241 die set. The punch
load and strain distribution on the Kirkesite die set is lower than those of the GM 241 die set. The changes of punch load
and strain distribution ot the deformed cup for two sheet steels are affected by the frictional behavior of each sheet steel.
It shows that the changes of frictional behavior having to be considered in the die design. 相似文献