共查询到16条相似文献,搜索用时 62 毫秒
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利用模具型面补偿的方法控制回弹,是模具生产中常用的控制回弹的方法。以炉具前面板为例,采用模具型面补偿的方法对其回弹进行了控制。利用此种方法设计出的零件已投入实际生产,实践证明:采用模具型面补偿的方法进行回弹控制是切实可行的。 相似文献
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回弹是冲压过程中不可避免的现象,基于CAE仿真技术的模具补偿,可以从根本上消除回弹的影响.模具的补偿型面一方面受CAE回弹仿真计算精度的影响,另一方面与冲压工艺参数息息相关,实际冲压时通常采取先补偿再工艺控制的方式来处理冲压件的回弹.现提出一种方法:先对工艺控制回弹量及相应的工艺参数进行计算,然后以工艺控制的回弹量最大值为基准构建模具补偿型面,以回弹最小的工艺参数组合作为设计工艺参数,并采用实验设计(DOE),响应面模型(RS)和遗传算法(GA)相结合的优化策略对确定补偿基准面进行优化求解.这样在实际模具修正的过程中可以有效地保证工艺控制回弹的区间,增加回弹控制的稳健性. 相似文献
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介绍了汽车冲压件回弹的影响因素和控制方法.研究了一种基于数值模拟的模具型面回弹补偿方法──位移补偿法,并用一三维件实例对该方法进行了验证,用该方法有效的实现了回弹控制,得到了修正后的型面数据. 相似文献
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模面几何修正的回弹补偿方向分析 总被引:3,自引:0,他引:3
精确回弹预测的目的是通过数值回弹模拟来修正模面,使得回弹后零件与设计的产品一致,因此,在回弹预测的基础上进行基于数值模拟或逆向工程的模面补偿和工艺调整,甚至修改成形方案和模具结构,仍然是当前降低回弹的主要措施。文章对模面几何补偿方法进行了阐述,对其应用特点、精度和效率进行了系统的对比分析,结果表明,在以转动为主导回弹的情况下,法向补偿具有很高的精度,但运行计算时间较长;在回弹存在大平移的情况下,连线方向补偿则精度较高,且算法简单;而Z向反向补偿法虽然具有算法简单、计算效率高的优点,却不能很好地对模面进行修正。 相似文献
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《CIRP Annals》2019,68(1):317-320
Limited geometric accuracy in incremental sheet forming is a major obstacle for its wide adoption in industry. This paper develops a generic methodology, suitable for arbitrary part geometries and various ISF processes, for addressing one of the main causes of geometric inaccuracy, i.e., in-process springback. The methodology consists of three main elements: determination of key control points to treat geometric complexity, simplified simulation models to predict springback offline, and in-situ toolpath modification during forming. It is shown experimentally that the method provides an efficient and robust solution for various geometries with negligible setup cost. 相似文献
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In this article, strategies which compensate geometrical deviations caused by springback are discussed using finite element
simulations and statistical modelling techniques. First of all the ability to predict springback using a finite element simulation
model is analysed. For that purpose numerical predictions and experiments are compared with each other regarding the amount
of springback. In a next step, different strategies for compensating springback such as a modification of stress condition,
component stiffness and tool geometry are introduced. On the basis of finite element simulations these different compensation
strategies are illustrated for a stretch bending process and experimentally checked for an example. Finally springback simulations
are compared regarding their robustness against noise variables such as friction and material properties. Thereby a method
based on statistical prediction models is introduced which allows for an accurate approximation of the springback distribution
with less numerical effort in comparison to a classical Monte-Carlo method. 相似文献
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为解决冲压成形的零件与原产品数据偏差较大的难题,提供了2种回弹补偿方式,即AutoForm迭代补偿与几何补偿,以某车型顶盖为研究对象,分别对2种补偿方式重构的型面进行全工序CAE分析,对比其回弹结果。AutoForm迭代补偿在全夹持状态下,局部区域的回弹量超过3 mm,几何补偿方式在补偿量为6 mm时,全夹持状态下回弹量在1.5 mm以内,说明AutoForm迭代补偿不宜用于自由回弹量大的零件,采用几何补偿可以提高回弹补偿的准确性。三坐标检测试制首件的尺寸符合率为85.2%,模具状态研配到与数值模拟边界条件一致时,尺寸符合率可达96.5%,验证了几何补偿方式的有效性。 相似文献