共查询到17条相似文献,搜索用时 78 毫秒
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此文介绍了利用数字计算机进行矩形截面环轧制的优化规程设计方法,优化是基于轧制过程的物理模型,考虑了各种轧制约束条件,结果符合实际生产情况,并且可使轧机容量得到充分利用,大大缩短轧制所需时间,节约材料与能源消耗。 相似文献
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应用MARC/autoforge有限元软件对方轧件在椭圆孔型中的轧制温度场进行了热力耦合模拟.研究了模拟过程中的传热边界条件,分析了轧制前和轧制过程中轧件中温度场的分布和变化规律.模拟计算结果和实验结果的比较说明二者基本是相符的. 相似文献
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以典型的矩形断面形状药芯焊带轧制成形过程为研究对象,通过实验测试,得出了成形时主要工艺参数与相对压下量之间的变化规律,为药芯焊带轧制成形工艺设计提供了理论指导。 相似文献
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此文在实验的基础上介绍了研制截面为阶梯形异型悬臂导轨钢的工艺过程。重点论述了轧制工艺过程和分析了拉伸矫直工艺过程机理,用轧制的方法生产出合格的阶梯钢,使进口设备易损件国产化。 相似文献
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以X110型车门为例,分析零件工艺性,介绍滚压成形工艺过程,强调在模具设计和制作中应注意的问题。设计由滚压、校正、滚焊和自动断料等工艺流程组成的滚压线,可作为类似滚压工艺参考。 相似文献
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《Journal of Manufacturing Processes》2002,4(2):97-108
The upper bound element technique (UBET) is used to determine the optimum intermediate shape for profile ring rolling using backward simulation. The lowest energy rate is the key issue in achieving the optimal intermediate shape as well as the backward simulation of the process. The plastic flow of material in ring rolling is assumed to be a sequence of successive closed-die forging processes. The ring is divided into features, which provide an approximated profile consisting of a number of rectangular elements. The simulation of the profile ring rolling was tested with different profiles of rolls, and two such cases are presented here. The present method was validated using an experimental radial ring rolling mill designed and fabricated in the Dept. of Mechanical Engineering at Ohio University for the investigation of both cold and hot ring rolling processes. As the results show, this technique is capable of solving the backward simulation of profile ring rolling problems in a much shorter time compared to the finite element method (FEM), which cannot easily simulate profile ring rolling. Moreover, as an engineering tool, this approach can be applied effectively to the profile ring rolling process and can serve as a useful tool in industrial applications. 相似文献
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《Journal of Manufacturing Processes》2000,2(4):217-224
Accurate prediction of the onset of chatter is difficult in designing and operating a rolling mill. Both the lack of precise rolling process models and analytical methods for the investigation of mill stability have forced designers and users to rely on experience and trial and error, which are time consuming and cost demanding. A comprehensive rolling process model is introduced to form the foundation of chatter analysis that includes a range of possible process variations. Analytical chatter models for both single and multiple-stand rolling mills are constructed that account for interactions between mill structure and rolling process, as well as between adjacent stands. Stability analysis is performed to formulate criteria for rolling mill design and operation. Finally, simulations and experiments are presented to verify some basic components of the rolling process model that constitute the proposed chatter models. 相似文献
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The objective of the present study is to investigate the role of cold rolling on the foaming ability (or foamability) of aluminium precursors, made by continuous rotary extrusion, a process performed at elevated temperature, starting by powder. For this purpose, the effect of different parameters including initial shape of precursors, rolling direction, amount of deformation in each rolling pass and final thickness of rolled specimens are experimentally investigated. Furthermore, the foaming efficiency of both rolled precursors and as-received extruded ones is compared. To clarify the role of secondary processing operations on the foaming efficiency, precursor samples are prepared following different forming and machining process chains, before the final foaming operation. Finally, hardness tests are performed on as-received precursors and rolled samples to notice the correlation between rolling parameters, state of strain, foaming efficiency and hardness. The results of the study show that: (a) cold rolling considerably improves foamability, (b) rectangular precursor bars have higher foaming efficiency than round ones, both before and after cold rolling. Besides, the improvement in foamability due to cold rolling is greater if precursors are rolled in the extrusion direction, rather than the orthogonal direction. 相似文献
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分析了导布辊辊筒加工中的一个重要工艺辘圆工艺。论述了完成这个工艺的装备 ,辘头、辘模和辘床的一些设计方法 相似文献
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结合用盘条生产药芯焊丝过程 ,对冷态金属连续轧制成形工艺特点进行了多方面的分析 ,特别是在改善连轧稳定性、提高轧制精度、降低能耗、减少设备成本等方面 ,提出了一些改进措施。 相似文献