共查询到20条相似文献,搜索用时 281 毫秒
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碟形件新型旋压成形工艺实验研究 总被引:2,自引:1,他引:1
介绍了基于离散点逐个调形原理的新型高效旋压成形工艺的原理,在研制出的旋压成形装置上进行了碟形件的成形实验,研究了成形辊加载方式对板材成形的影响,分析了蝶形件成形过程中起皱和减薄原因。结果表明,两种加载顺序蝶形件都有减薄现象出现,但是由中心向边缘的成形顺序的减薄率略低于由边缘向中心成形实验件的减薄率,着重分析了厚度为2 mm板材的旋压成形件减薄规律,为较厚板材蝶形件的加工奠定基础。 相似文献
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无芯模旋压由于不受芯模限制,适合复杂曲母线工件的柔性旋压成形,但仍需一定的辅助支撑,以克服成形形状精度较差的问题。针对主辅旋轮的曲母线件无芯模旋压,运用仿真与实验相结合的方法分析其在有无端部辅助支撑、有无辅助旋轮支撑时的旋压效果,分别对仿真结果的应力、应变、轮廓形状和壁厚分布情况进行了探讨。结果表明,端部辅助支撑有助于提高整体弯折变形效果,辅助旋轮支撑有助于板料局部成形,复合辅助支撑则综合了两者的成形特性,可以得到满足成形质量的工件。另外,通过变进给和首道次预成形直线形状的两道次旋压成形方法,对成形质量进行改善,结果表明两种方法相结合可以明显提高最大减薄率,改善壁厚均匀度。 相似文献
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Ken-ichiro Mori Minoru Ishiguro Yuta Isomura 《Journal of Materials Processing Technology》2009,209(7):3621-3627
A hot shear spinning process of cast aluminium alloy parts was developed to eliminate casting defects and to obtain a desired distribution of wall thickness. The forming load of the shear spinning is comparatively low even for large deformation requisite for eliminating the casting defects. Dendrites and shrinkage cavities in the cast aluminium alloys were successfully eliminated without occurrence of a fracture by the hot shear spinning. Surface cracks around the corner of the mandrel caused by large shear deformation were reduced by decreasing the feed rate of the roller and by increasing the tip radius of the roller. It was found that hot shear spinning is effective in improving the mechanical properties of cast aluminium alloys parts. 相似文献
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针对30CrMnSiA杯形件的电流辅助拉深旋压成形工艺,提出以旋压件的内径偏差和倒锥角作为成形质量指标;基于响应面法进行了30CrMnSiA杯形件电流辅助拉深旋压成形实验研究,分析了电流参数及旋压工艺参数对旋压件倒锥角的影响规律。结果表明:电流大小、预热时间与进给比对旋压件倒锥角具有显著的影响,旋轮与芯模相对间隙对倒锥角影响较小。电流大小与进给比对倒锥角的影响具有交互作用;预热时间与进给比对倒锥角的影响具有显著的交互作用。30CrMnSiA杯形件电流辅助拉深旋压最优工艺参数组合为:电流I=1200 A,预热时间th0=52 s,进给比f=0. 36 mm·r^-1,旋轮与芯模相对间隙δ=-38%。 相似文献
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直壁矩形盒渐进成形技术 总被引:2,自引:1,他引:1
介绍了金属板料数控渐进成形的原理、板料变形过程及直壁矩形盒成形的工艺规划。根据正弦定律,直壁矩形盒采用数控渐进成形工艺不能一次成形。经设计平行线形工具路径方法,并进行试验和分析,得出影响直壁矩形盒成形的主要参数是成形半锥角。 相似文献
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Plastic deformation behaviors and their application in power spinning process of conical parts with transverse inner rib 总被引:1,自引:0,他引:1
By using FE method combined with experimental method, the power spinning processes of conical parts with transverse inner rib under different processing parameters are investigated. It is found that three kinds of typical plastic deformation behaviors, namely, under-filled, full-filled and unstable plastic deformation behavior occur in the forming process; the under-filled plastic deformation behavior has two different deformation modes; clearance between forming roller and mandrel and feed rate of forming roller are the two decisive factors influencing the plastic deformation behavior. Based on the study of plastic deformation behaviors, reasonable range of processing parameters for obtaining desired transverse inner rib is determined. Further, combining with the effects of processing parameters on the degree of inhomogeneous deformation and surface quality of finished spun parts, the rules for selecting reasonable processing parameters in power spinning process of conical parts with transverse inner rib are established for the first time. Then, reasonable values of processing parameters for a given process are determined, and desired spun parts with transverse inner rib are successfully obtained in experiment. 相似文献
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为了研究对轮旋压成形机理,突破对轮旋压成形精度控制技术,采用有限元方法分析了道次减薄率、进给比、旋轮成形角以及内旋轮圆角半径等工艺参数对旋压件圆度、直线度及壁厚差的影响。结果显示:当道次减薄率Ψt=20%~30%、进给比f=1.5~2.0 mm·r-1、旋轮成形角αρ=25°、内旋轮圆角半径rρ内=10 mm时,旋压件成形精度最高。同时,分析了在总压下量为9 mm时,内、外旋轮在不同压下量下对成形精度的影响。结果表明:当外旋轮压下量为5 mm、内旋轮压下量为4 mm时,旋压件精度最高。最后,通过工艺实验验证了有限元仿真结果的准确性,结果显示两者偏差小于15%。 相似文献
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A flexible method of forming circumferentially variant wall thickness distributions on the same shape is attempted using two oblique sheet spinning processes. The fundamental strategy entails the inclination of the flange plane of the workpiece during forming. In one type of synchronous dieless spinning, edge-hemmed aluminum blanks are formed for truncated cone shells, by synchronizing the motion of the spherical head roller in the axial and radial directions with the angle of the general purpose mandrel fixed on a bidirectionally rotating spindle. On the other hand, in the other type of force-controlled shear spinning, flat aluminum discs are formed by feeding perpendicularly to the flange plane of the workpiece and maintaining the thrust force along the plane via the roller tool, exerted onto the rotating truncated-cone-shaped die. The estimated wall-thickness distribution based on a simple shear deformation model nearly conformed to the measured thickness distributions of the products formed at several inclination angles of up to 15 degrees in the forming and both spinning methods. The low-cost value-added forming method seems to be practicable not only for metal spinning but also for other incremental sheet forming processes. 相似文献
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Ichiro Shimizu 《Journal of Materials Processing Technology》2010,210(4):585-592
Asymmetric conventional metal spinning was performed in this study to break through the limitation of ordinary axisymmetric spinning. A synchronous spinning machine was developed for this purpose; in this case, the mandrel motion, mandrel feed, and roller feed were synchronized by pulse control. Trial spinning experiments were carried out on a 1-mm-thick aluminum sheet to obtain an asymmetric truncated-elliptical-cone-shaped product. The roller path was traced using a control software by taking into account the errors caused by the step pulse control. Asymmetric sheet metal forming was successfully carried out by using the developed synchronous spinning method. The characteristics of asymmetric spinning were discussed by comparing the shape of the product, strain distributions, and force components with those obtained in the case of axisymmetric spinning. 相似文献