共查询到20条相似文献,搜索用时 359 毫秒
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《塑性工程学报》2018,(6)
针对两步卷制锥台阶管易发生起皱等缺陷的问题,提出3步成形方案,即拱桥形成形U形成形O形成形;设计了相应模具,其中拱桥形成形和U形成形模具采用了压边块,O形成形模具采用了水平运动上凹模配合芯轴的结构;借助于Dynaform软件对成形过程进行了数值模拟,结果表明,拱桥形成形阶段是保证成形质量的关键步骤,且整体凸模成形难于控制起皱缺陷,进而采用分段差动凸模成形,减轻了起皱缺陷。为深入探索两端直径差异对成形质量的影响,取直径比值为0. 75、0. 60和0. 50,分别采用整体凸模和分段差动凸模进行成形试验,证明了制件两端直径比越小,越容易发生起皱;分段差动凸模成形可以有效减轻起皱问题;两种凸模引起的工件减薄情况差异不大。 相似文献
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针对U形件弯曲回弹问题,在Abaqus软件中建立6061铝合金薄板U形件拉延成形二维有限元模型,使用Numisheet’ 2011会议回弹测量方法和成形极限图缺陷判据,研究U形件成形过程中单工艺参数对回弹量的影响,通过L_9(3~4)正交试验获取U形件回弹控制最优工艺参数组合。结果表明:不改变其他成形工艺参数,U形件回弹量随着凸、凹模圆角半径或拉延深度的加大,总体呈上升趋势,随凸、凹模间隙值的减小总体呈下降趋势;U形件回弹量随"凸模-板料"摩擦因数的增大而增大,随"凹模、压边圈-板料"摩擦因数或压边力的增大而减小;成形工艺参数影响U形件回弹量的主次顺序依次为"凹模、压边圈-板料"摩擦因数、"凸模-板料"摩擦因数、凸、凹模间隙值、压边力,以优水平工艺参数组合A_2B_3C_1D_3进行成形模拟,U形件法兰端部最大位移偏移量为0.84 mm,回弹控制效果明显。 相似文献
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楔块锁模空心枝形件闭式挤压模具设计 总被引:1,自引:0,他引:1
因空心枝形件形状所致,其挤压成形无法采用上模插入下模的闭式锻模结构.本文论述了空心枝形件闭式挤压工艺,给出了空心枝形件闭式挤压新型模具结构和设计要点.该模具采用楔块锁紧上凹模与下凹模对合结构,锻件在两个凹模和两个凸模形成的封闭模腔中挤压成形,生产的锻件无飞边. 相似文献
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介绍了用在通用冲床上的弓形件一次成形弯曲模的结构、工作过程和主要模具零件设计。该模具采用2组橡胶板实现凸模和凹模底板分别浮动结构,提高了生产效率和弯曲件质量,降低了模具的磨损。 相似文献
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多层薄壁零件冷挤压模设计 总被引:1,自引:1,他引:0
介绍的多层薄壁零件冷挤压模 ,采用镶套式组合凸、凹模和浮动凹模结构 ,不仅解决了型腔制造和工件脱模的困难 ,而且改善了模具的填充、排气性能 相似文献
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Kinji Sato Yoshiaki Sawa Yuhji Abe Toshio Yokoyama Hotsumi Kagawa 《Metals and Materials International》1998,4(6):1213-1218
The purpose of the present paper is to study methods to improve the stretching limit of metal sheet. The factors affecting
the stretching limit were sheet thickness, blank diameter, blank holding pressure, and forming rate. Punch radius, die radius,
and clearance between a punch and a die were retained constant. Tested materials were softened and half hardened types of
aluminum sheet. The effect of lubrication was also studied. Lubricants used were a press working oil and graphite. Stretching
by two types of punch shape, a spherical head punch and a truncated cone one, was tried in order to research the effect of
punch shape. The half hardened aluminium, which has a larger n-value, showed the larger stretching limit. The larger thickness
gave rise to the larger stretching limit. Flow characteristic of materials was poorer in larger diameter of a blank, so its
stretching limit was lower. A bit lower holding pressure, which allows drawing of materials to some extent, yielded larger
stretching limit than rigid holding. The forming rate did not so much affect stretching limit. Concerning the effect of lubrication,
applied position of lubricants was important. 相似文献
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阀瓣闭式温挤压工艺与模具设计 总被引:1,自引:0,他引:1
介绍了阀瓣闭式温挤压工艺及挤压模结构和设计要点。该模具采用浮动的上凹模与下凹模对合结构 ,挤压件在两个凹模和凸模形成的封闭模腔中挤压成形 ,生产的挤压件无飞边。 相似文献
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介绍了前支架多工位级进模设计 ,分析了零件的工艺性 ,重点阐述了排样设计 ,确定了模具结构及凸、凹模的镶拼形式 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
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介绍了某直流电机转子铁芯级进模结构设计 ,阐述了模具凸、凹模设计及抬顶料装置、卸料板结构及各零部件材料、热处理技术要求等 相似文献
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通过对管类制件及其径向孔成形工艺的分析,针对传统加工管类制件径向孔存在的问题及经济性和批量生产的需求,介绍两种典型模具结构,阐述模具结构的工作过程,并对其中典型零件——几种凹模及凸模结构的工艺优缺点比较。总结了管类制件模具结构设计要点及管类制件材料和尺寸要求。作为模具设计者掌握全部设计要点定会提高了模具设计水平,从而会大大提高制件生产率。 相似文献