共查询到20条相似文献,搜索用时 89 毫秒
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为研究辊轮数量对曲线回转外形筒体件辊挤成形表面质量的影响,利用Deform-3D软件,对二辊、三辊和四辊辊挤成形进行了数值模拟。模拟结果表明,随辊轮数量增加,在同一平面内,辊边距型槽圆弧中心距离变短,辊边与型槽圆弧中心线速度更接近,金属变形更同步,变形更均匀。第1道次辊挤成形后,二辊辊挤工件口部极不平整,金属充满飞边槽后流入辊缝形成薄飞边,整形时出现折叠;三辊和四辊辊挤件口部较为平整,金属没有充满型槽,也没有流入辊缝。第2道次辊挤整形后,三辊、四辊辊挤工件未出现折叠、裂纹等缺陷。三辊辊挤时,金属流入飞边槽体积最少,故辊挤后工件长度最长。随着辊轮数量的增加,辊轮所受径向力呈减小的趋势,四辊受力最小。 相似文献
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宋渊 《组合机床与自动化加工技术》2012,(5):82-85
对薄圆盘形零件的车削加工工艺和夹具进行了研究.通过对薄圆盘形零件在加工过程中产生变形原因的分析,优化了工艺过程.通过对不同的夹紧方式和夹紧力对零件变形影响的计算分析,为薄圆盘类零件车削夹具的设计提供了理论依据.在此基础上,经反复试验和摸索,总结和制定了一套薄圆盘形零件车削加工的工艺方法,收到了满意的效果. 相似文献
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在介绍一种斜对称U形弯曲件结构特点的基础上,对零件加工工艺性进行了分析,并且对弯曲模加工的零件产生变形原因进行了探讨,借助有限元软件对零件弯曲变形过程进行了数值仿真,使变形现象更为直观。针对零件产生缺陷的原因,对弯曲模结构进行了改进,使制件完全达到设计要求。 相似文献
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工作辊擦辊器的上、下擦辊梁在加工中存在工件易变形、堆焊合金层厚度均匀性要求高、槽加工难度大等问题。对工件的工艺流程和机械加工工艺进行了合理的安排,优化生产工序,使加工工艺满足了设计要求,保证了产品质量和生产进度。 相似文献
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通过介绍定子坯料制件形状特点、尺寸精度要求和传统加工工艺,指出现在制造该类制件可利用冷挤压工艺加工。介绍了制造该类制件的冷挤压加工中的反挤压与贯穿挤压工艺及其模具,重点分析比较了两种挤压工艺的各自特点,得出冷挤压生产定子坯料中贯穿挤压工艺明显优于反挤压工艺的结论。 相似文献
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为解决电解加工型孔的加工稳定性和形状精度等问题,建立了异形孔电解加工稳定过程中加工间隙数学模型,分析了工具阴极结构对加工区域和非加工区域的电场及其均匀性以及其对电流密度与加工效果的影响,通过优化工件结构改善了加工间隙内的电场分布,使工件形状精度显著提高,并进行相关试验对仿真结果进行验证。得出结论:在相同的电解加工参数下,工具电极的结构对工件的形状精度有着显著的影响,通过优化工具电极结构,改善加工间隙内的电场分布与电流密度,让加工间隙内的流场更为稳定,使工件侧壁垂直度提高,提高了电解加工的形状精度与加工稳定性。 相似文献
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J.H. Min H.C. Kwon Y. Lee J.S. Woo Y.T. Im 《Journal of Materials Processing Technology》2003,140(1-3):471-477
In process design of bar rolling, accurate prediction of deformed shape of the rolled workpiece is important in determining the total number of passes. Thus, development of an approximate analytical model for predicting an accurate rolled shape with less computation time will be beneficial for practical purpose. In the present study, such a model for the three-roll system with multi-passes was developed by deriving spread and geometrical configuration formulae from the finite element (FE) analysis results of a seven-passes sequence rolling. In FE simulations, process parameters such as the initial workpiece geometry and the amount of roll draft and roll speed were varied. By comparing spread ratios of FE simulation results three representative geometry changes (round–curved hexagonal, curved hexagonal–hexagonal, and hexagonal–hexagonal) were identified. For each representative geometry change those two formulae were determined in the present investigation. The formulae determined were further applied to a three-roll process with four-passes sequence. The final workpiece geometry predicted based on the model developed was found to be in good agreement with experimental and FE simulation results. Thus, the analytical model developed in the current approach can be effectively used in the design of multi-pass three-roll rolling processes. 相似文献
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We machined work roll with groove worn down as well as groove with no wear. We then performed a pilot hot rod rolling test at temperature of 1000 °C using plain carbon steel (0.1% C) as the roll gap decreases from reference roll gap (6.5 mm) to 3.5 mm. To understand better the effect of roll gap (i.e., section height) adjustment on the exit cross sectional area (ECSA) variation of workpiece in a two-stand groove rolling process with wear is considered, we carried out a series of three dimensional finite element analysis. Results reveal that variation of ECSA is almost linearly proportional to roll gap change while the roll gap decreases from reference roll gap (6.5 mm) to 3.5 mm. In oval groove rolling, the exit cross sectional shape and area predicted by FEA is in a good agreement with those measured. In round groove rolling, however, some deviations between FEA and experiment are observed because of roll groove geometry coupled with cross sectional shape of incoming workpiece. In the two-stand groove rolling, the effect of roll gap adjustment at each stand on the exit cross section of workpiece is somewhat different, in comparison with single-stand groove rolling. The roll gap adjustment at the previous stand has a more influence on the ECSA of workpiece than that of the next stand. 相似文献
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介绍了常用的铝型材挤压模的制造工艺.通过对挤压模的制造工艺分析,详细叙述了铝型材模的机加工、电加工及热处理和部分工艺参数的选择. 相似文献
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根据薄壁焊接件工艺特点,分析薄壁焊接件的加工难点,从加工效率、加工精度等角度出发,给出了工艺路线和加工方案,针对加工中出现的问题给出了具体的解决措施。 相似文献
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分析并介绍一机车启动齿轮坯的镦挤工艺特点及模具,其矩形花键由传统机械加工改为冷镦挤压成形,齿顶圆一次镦挤成形,具有生产效率高,产品质量好,产品尺寸稳定,晶粒细小等特点,同时对冷镦挤压成形模的设计与制造进行详细介绍。 相似文献