A novel laboratory blanking apparatus for the experimental identification of blanking parameters

High-quality blanking depends on several blanking parameters that are difficult to investigate with industrial blanking presses. In this research, a novel laboratory blanking apparatus that allows quasi-static and dynamic blanking at different blanking speeds is presented. With a clear focus on the dynamics of the blanking process, the inertial correction of the punch force, the surface velocity and the surface temperature of sheet-metal are researched. In addition, measurements of the punch–die misalignment and the punch–die inclination-angle are discussed. The apparatus is also able to perform a partial penetration of the punch to a selected depth with an accuracy of better than 10 μm. The apparatus was shown to offer us a new insight into the blanking process that can increase our understanding and therefore result in better numerical models and better products.     

大吨位油压机压边结构研究

大吨位油压机主要用于铁路货车部分零件的拉伸成形.如70吨级通用敞车下侧门板、70吨级通用棚车侧板等零件.为了进一步提升零件的产品质量和零件平面度,油压机应具有上压边功能,满足正拉伸成形所需要的压边力,从而实现对零件产品质量和平面度要求.本文通过分析起伏成形件压型模具与大吨位油压机工作结合部分原理,从优化大吨位油压机压边结构入手,实现提高零件产品质量和平面度的目的.     

冲裁速度对电机定转子铁芯冲裁断面质量影响规律研究

本文通过建立有限元模型,选择韧性断裂准则和断裂因子,研究冲裁速度对电机定转子铁芯冲裁断面质量影响的规律。通过实验获得电机定转子铁芯所用材料——硅钢片的真实应力应变曲线,并把此应力应变曲线运用于模拟中,通过设置不同的冲裁速度,得到不同的光亮带长度,从而可优化出最佳冲裁速度。分析对比模拟结果和实验结果,两者非常接近,可证明本研究对提高产品质量和生产效率有很好的借鉴作用。     

电机冲片复合模具减少冲裁力的措施

电机定、转子冲片冲裁工艺中有许多情况需要使用复合模具冲制。当冲制较大直径电机冲片复合模具时,冲裁力很大,有时受条件限制没有大吨位压力机,无法冲裁。经试验,找到一种可以减少冲裁力的方法,从而解决实际的生产问题。     

厚板冲裁过程的模拟仿真及其参数优化

利用有限元模拟仿真软件Deform3D以及2D,对20Cr钢7mm厚板冲裁进行了模拟,采用NormalC&L断裂准则,分析了裂纹的产生和扩展机理,以及影响厚板冲裁质量的几个核心因素,得到了影响规律。通过进一步优化相关工艺参数,其结果为提高冲模寿命和冲压件质量提供了依据。     

冲压毛坯排样CAD技术的研究

冲压先导排优化问题是冲模ＣＡＤ领域的一大课题。在简要介绍先导排样ＣＡＤ的技术构成的基础上,总结了一种高效,合理的普通排样核心法;改进的一步平移法。并扩展至毛坯嵌套排样问题,提出了裁剪分段平移方法,对解决该问题提供了条新的思路。     

汽车刹车片背板冲压加工与模具设计

汽车刹车片背板是汽车上易损零件,生产批量大。零件厚5mm,精度要求很高,大多采用精冲工艺生产。本文通过对汽车刹车片背板的工艺分析,采用普通冲孔落料、斜面成形和修整等工序）中压生产,并设计了相应各工序的模具,在模具结构设计中解决了诸如零件定位、圆弧斜面定位和模具偏载等问题,最终生产出了满足要求的零件。实践证明：背板生产工艺可靠,质量稳定。解决了用普通冲压工艺和设备生产精冲零件的问题,提高了企业的经济效益。     

Prediction of burr height formation in blanking processes using neural network

Productivity and quality in sheet metal blanking processes part can be assessed by the burr height of the sheared edge after blanking. This paper combines predictive finite element approach with neural network modelling of the leading blanking parameters in order to predict the burr height of the parts for a variety of blanking conditions.Experiments on circular blanking operation has been performed to verify the validity of the proposed approach.The numerical results obtained by finite element computation including damage and fracture modelling and tool wear effects were utilized to train the developed simulation environment based on back propagation neural network modelling.A trained neural network system was used in predicting burr height of the blanked parts versus tool wear state and punch-die clearance.The comparative study between the results obtained by neural network computation and the experimental ones gives good results.     

现代轿车制造业中的开卷落料线

根据生产实践经验,提出了用于现代轿车制造业的开卷落料生产线的技术要求。它包含对卷料的性能,对开卷、清洗、矫直、堆垛、控制等各重要环节的技术参数和若干选择的原则。     

棒料精密剪切模设计

介绍了一种在通用曲柄压力机上使用的带有自动压料和自导向装置的棒料精密剪切模的设计。模具结构紧凑，适应性强，能较好地克服普通棒料剪切模常见的缺陷和弊端。