基于PLC的模糊控制系统在连铸结晶器液位控制上的应用

通过安阳钢铁公司原有PID液位控制技术和模糊控制系统的研究,开发出一种模糊控制和PID相结合的控制方法,改善了原有控制系统的不足。     

基于UG的手机前盖注塑后模数控加工与仿真的应用

通过手机前盖注塑模具型芯的数控加工流程,详细阐述了UG软件在模具加工方面的应用,具体分析了其加工工艺、刀路的设计及其刀具轨迹检查过程,并且利用UG软件的后处理功能,自动生成手机前盖后模所需要的数控加工的NC代码,提高了复杂型芯的制造加工速度,展示了UG软件多样化的数控加工编程策略.     

基于Moldflow分析的汽车储物箱注塑模设计

以汽车储物箱为实例,借助模流分析软件Moldflow对其浇口位置、充模时间、注射压力、气穴和熔接痕等进行模拟分析,根据分析结果有针对性地优化模具设计方案。并将分析结果用于实际生产中,取得了较好的效果。     

基于UG注塑模具标准件三维参数化图形库的开发

分析了开发注塑模具标准件三维参数化图形库的必要性,提出了基于UG平台采用VC编译建立新国标注塑模具标准件图形库的思路:通过调用数据库中的参数数据或直接由用户界面输入,应用参数化设计技术在UG中生成标准件实体模型。     

SMC模塑料在汽车中的应用

轻量化、环保和舒适安全性将成为我国汽车用材料未来发展方向。介绍了SMC材料生产工艺流程和特性;描述了SMC材料在汽车零部件中的应用。SMC模塑料具有质量轻、性能优、耐腐蚀、使用寿命长、可靠性高和模压工艺简便等优点,将在汽车上得到广泛应用。     

基于UG和Master CAM的LCD盒注塑模具设计与加工

以LCD盒塑件为例,利用UG软件对注塑模具进行了设计,并运用Master CAM软件对模具型腔进行了数控加工。结果表明:UG和Master CAM两个软件相结合,不仅能够提高注塑模具设计与加工的质量和效率,而且能够缩短模具生产周期。     

铝合金压铸用8407模具钢的表面改性

8407钢是常用的铝合金压铸用模具钢.为改善模具的抗热疲劳和抗熔损性能,对冷喷涂A1后的8407钢试样在500,550℃下进行扩散处理,渗铝后的试样在纯O2气氛,570℃的条件下进行氧化,渗层表面形成了Fe-A1-O的混合氧化物.考察了扩散温度和扩散时间对渗层质量的影响,研究了在纯O2气氛下Fe-A1合金表面的氧化情况.结果表明,8407钢经过冷喷涂铝后再进行低温扩散处理能够实现低温渗铝.渗铝后,在580℃以下,纯O2气氛条件下氧化,Fe-A1合金表面生成了FeO和.A12O3的混合氧化物.该氧化膜与铝液不润湿,可防止粘膜并改善模具的抗热疲劳和抗熔损性能.     

一种测试硬化水泥浆体自应力的新方法——波形管法

波形管法集合了传统的体积法和线性法的优点,而避免了它们的缺点,成为国际上测试硬化浆体或混凝土自应力的新方法,因此详细地介绍了它所用的器材和试验方法,并进行验证.所得的试验结果与其他研究者的结果一致,即粉煤灰减小了低水灰比硬化浆体的自应变,而硅灰增加了自应变;AFt型膨胀剂、减缩剂和超吸水剂能不同程度的减小硅灰引起的自应变,但减缩剂效果较好,而超吸水剂与其掺量有关.     

Vortex characteristics due to nozzle clogging in water caster mould: modelling and validation

In continuous slab casting, clogging in the submerged entry nozzle (SEN) ports leads to flow asymmetry and vortex formation in the mould. Knowledge of vortexing and its influence on product quality is fundamental for defect-free production. In this study, the interconnected effects of nozzle clogging and SEN submergence depth, variation on flow asymmetry and vortex characteristics in a 0.4 scale water caster have been characterised by CFD investigation and validated with experimental results from the authors’ previous work. Mean flow velocities at the sub-meniscus and near the port exit predicted by the computational model are compared with the time-averaged values of the impeller probe velocity measurements and found to be in reasonable agreement. Three different clogging conditions (0, 33 and 66% in the left port of the SEN) for SEN submergence depth of 60?mm are studied and the 66% clogging produced vortices having largest diameter, which is consistent with the experimental observations. The effects of SEN submergence depth on flow asymmetry and vortexing are investigated with three different conditions – 40, 60 and 80?mm. It is found that the shallow SEN submergence depth (40?mm) produces vortices of largest diameter and the flow is most stable for a SEN submergence depth of 60?mm among the three cases. Vortex bending towards the SEN as noticed in the experimental observations is also observed in the computational study. This work illustrates the possibility of capturing features of vortexing using validated CFD model.     

Electromagnetic torque detecting for optimization of in-mould electromagnetic stirring in the billet and bloom continuous casting

ABSTRACT

In this paper, an electromagnetic torque device based on the theoretical model was established to determine the optimum frequency accurately and conveniently in billet and bloom continuous casting with in-mould electromagnetic stirring (M-EMS). Magnetic characteristics with M-EMS was investigated by numerical simulation and physical experiment with the application of electromagnetic torque device and gauss meter. In addition, the effects of stirring frequency with M-EMS on macro segregation and equiaxed crystal ratio were compared and analysed for 55SiCr with 150?mm?×?150?mm billet caster and BU with 310?×?360?mm bloom caster by a series of plant trials, respectively. The results showed that maximum magnetic flux density and maximum electromagnetic torque occurred with different frequency and same current in M-EMS, and central equiaxed crystal ratio and macro segregation has been significantly improved by optimum frequency with M-EMS.