实时控制压铸机的技术优势及应用

介绍了压铸机控制理论的发展和压铸机嵌入式实时控制技术的概念及其特点优势,给出了压铸机压射系统的电液原理图,嵌入式实时控制的配置方案,实时控制曲线的分析及与传统控制技术的对比。介绍的实时控制压铸机已经进入应用环节,并取得了较大的市场份额和较好的评价。     

液体火箭发动机启动冲击特性研究

将小波分析法运用于液体火箭发动机启动冲击信号的分析处理中.小波分析在时域和频域上同时具有良好的局部化性质,可以对指定频带和时段内的信号成分进行任意尺度的分析,从而可以聚焦到对象的任意细节,特别适合分析不同启动冲击信号之间细小的时序和频率成分差异.通过对启动冲击信号时间-能量谱、频率-能量谱、时间-频率-能量谱的多视角聚焦分析,发现不同信号之间的细小时序和频率差别,分析可能的影响因素.为液体火箭发动机启动过程的故障诊断提供参考依据.     

防止气动部件启动冲击的控制方法

本文通过设计可编程控制器控制程序的方法使工作气缸始终保持足够的背压，从而使气动部件启动时避免了冲击，运动趋于平稳。     

压铸机压射系统全闭环实时控制应用

该文介绍了冷室压铸机压射系统的全过程闭环实时控制技术的应用。为了提高压铸机模具型腔内的压铸件质量,该系统采用新型数字式伺服驱动器和液压阀芯驱动专利技术——VCD音圈驱动技术的高频响比例节流阀,对压射油缸的速度,位置和压力进行全过程的闭环实时控制,大大提高了压铸机的整体机动性,稳定性和可靠性。     

Windows平台数控系统的实时控制

运用硬件上的时钟电路和软件上的设备驱动程序实现了实时控制，并采用事件同步机制解决了中断问题。这种独特的解决方案具有一定的实际意义。     

全软件数控系统实时控制研究

讨论了Windows系统下的几种采用定时中断的方式来获得数控系统实时控制的方法。比较深入地分析了通过外部硬件中断实现的方法,并结合Windows操作系统的多线程机制来实现数控系统控制的实时性。     

存在预启动设备的综合调度算法

针对目前综合调度研究中没有考虑存在预启动设备的情况,忽略预启动时间对整体加工时间影响的问题,提出存在预启动设备的综合调度算法.该算法在预启动设备处于空闲状态时采用提出的预启动长路径优先策略,在预启动设备处于工作状态时采用提出的预启动短路径优先策略,以提高预启动设备的并行化和减少了设备的预启动次数;采用提出的调整序列确定...     

FMS实时控制仿真系统

本文介绍了ＦＭＳ实时控制仿真方法和系统。通过通讯网络与控制系统一起运行，实际ＦＭＳ运行的各种行为表现，完全可在该仿真系统上体现出来。     

HDJ003平面关节型装配机器人微机实时控制系统

介绍ＨＤＪ００３型平面关节型装配机器人微机实时控制系统的基本构成，包括控制系统的硬件组成，软件结构，控制系统分析与设计。最后给出机器人装配试验结果。     

基于 Windows的全软件数控系统实时控制的研究

讨论了Windows系统下的几种中断机制,提出了实现全软件数控系统实时控制的一种方案,通过硬件中断及利用Windows操作系统的多线程机制来实现加工控制的实时性。     

压铸设备运行实时监控系统研究及应用

针对压铸设备运行状态信息难以实时获取和生产过程管控力度薄弱等问题,结合套接字(socket)通信机制对压铸设备运行过程实时数据采集技术和数据处理技术进行了研究,构建了压铸设备实时监控系统的体系结构和功能结构,并基于Java语言设计和开发了一套压铸设备实时监控系统。该系统已成功应用于某企业压铸车间的生产现场,并取得了良好的效果。     

Maximizing average efficiency of process time for pressure die casting in real foundries

Scheduling of casting processes is the problem of determining the number of products that will be manufactured in each casting shift so as to optimize a predetermined objective function. In this paper, we propose a linear programming (LP) model that maximizes the average efficiency of process time for casting in real foundries. The considered casting process is pressure die casting, the most prevalent permanent mold casting process, equipped with an automated die exchange device. In permanent mold casting, the use of a mold or die installed on a casting machine requires a significant process time for casting. The objective function of the proposed LP model is defined as the average ratio of the actual process time to the pre-assigned operating time in a shift. A solution that minimizes the objective function will provide the maximum surplus time, hence optimizing the efficiency of casting operations in terms of process time. Numerical examples are presented to illustrate the applicability and reliability of the proposed model. The results demonstrate that this model is an effective and conveniently implemented tool for solving real casting sequences in a simple and practical framework.     

进口热室压铸机压射缸的改造

压射缸是热室压铸机进料系统的关键部件。本文介绍温州永久锁厂对德国富来(FRECH)公司进口的63t热室压铸机压射缸进行改造,取得良好效果。     

基于模糊控制的挤压铸造模温控制系统研究

针对挤压铸造模具温度难于控制的特性,分析了挤压铸造工艺及挤铸模具温度影响因素。根据现有挤铸模具加热及冷却方式,结合分析研究影响挤铸模温的多因素与多变性,建立了新的挤铸模具温度控制模型,并运用模糊控制方法来实现温度控制。在设计好模糊控制器后,利用Matlab软件中的Simulink模块建立了模温控制系统模型并实现了仿真分析。仿真结果表明:与传统的PID控制相比,模糊控制系统具有良好的控制特性。     

An energy consumption prediction approach of die casting machines driven by product parameters

Die casting machines, which are the core equipment of the machinery manufacturing industry, consume great amounts of energy. The energy consumption prediction of die casting machines can support energy consumption quota, process parameter energy-saving optimization, energy-saving design, and energy efficiency evaluation; thus, it is of great significance for Industry 4.0 and green manufacturing. Nevertheless, due to the uncertainty and complexity of the energy consumption in die casting machines, there is still a lack of an approach for energy consumption prediction that can provide support for process parameter optimization and product design taking energy efficiency into consideration. To fill this gap, this paper proposes an energy consumption prediction approach for die casting machines driven by product parameters. Firstly, the system boundary of energy consumption prediction is defined, and subsequently, based on the energy consumption characteristics analysis, a theoretical energy consumption model is established. Consequently, a systematic energy consumption prediction approach for die casting machines, involving product, die, equipment, and process parameters, is proposed. Finally, the feasibility and reliability of the proposed energy consumption prediction approach are verified with the help of three die casting machines and six types of products. The results show that the prediction accuracy of production time and energy consumption reached 91.64% and 85.55%, respectively. Overall, the proposed approach can be used for the energy consumption prediction of different die casting machines with different products.     

实时修正偏移量的循迹机器人控制系统研究

提出一种循迹机器人控制系统,通过实时修正机器人坐标与理想运动轨迹之间的偏移,实现机器人快速、有效的循迹。首先,采用粒子群优化算法规划理想运动轨迹;其次,根据正交落地码盘与陀螺仪实时获取机器人坐标及运动轨迹,经与线性化的理想运动轨迹比对,确定偏移量及方向;最后,将偏移量修正转化为机器人运动速度控制,从而实现了高精度闭环运动控制。实验结果表明,基于该控制系统搭建的机器人平台,线性化的理想轨迹和实际轨迹比对的最大偏差值为50.0 mm,在此偏差值内,实时修正偏移量,机器人能够自动回到线性化的理想轨迹上运行,且运行平稳、舒展,完全保证了机器人所要求完成的终点任务,与现有循迹机器人控制方法相比,提出的循迹机器人控制系统实现了较高精度的循迹与定位。     

模糊控制在低压铸造中的应用

低压铸造是目前广泛应用的铸造成型工艺。该针对铝合金车轮的铸造工艺要求,采用模糊控制技术实现低压铸造过程中对气体压力的快速准确跟踪。实际应用表明,所研究的模糊控制器具有良好的性能。     

磁流变阻尼器设计及实时控制研究

设计了基于混合工作模式的小型磁流变阻尼器,并分析了其力学特性.针对阻尼器的时间响应要求,设计了一种高精度PWM电流驱动器,采用PI控制算法改善电流响应时间.仿真结果表明,电流响应快,精度高,达到稳态值的95%所需的时间约为0.3毫秒.并通过对实物进行试验,得到相应的关系曲线.     

带特殊工艺约束的双目标并行多机调度问题研究

港口的拖轮调度过程是一类带特殊工艺约束的并行多机调度问题.采用基于进化策略的混合算法,设计了基于工件的编码方式,对次序杂交算子进行了扩展,设计了一种扩展“倒位”变异算子,并采用相邻不同基因多次交换的局部搜索方法.算法的设计自动满足了工艺约束,保证了种群的多样性.设计了最大完工时间和生产加工成本双目标评价函数,最后通过计算对混合算法进行了验证.     

Plaster casting process for prototyping of die casting based on rapid tooling

Rapid prototyping (RP) combined with a gravity casting process can provide a suitable substitute with steel tool die casting for prototyping metal casting. Due to differences between die casting and gravity casting, there are several drawbacks in RP simulated die casting. This paper is concerned with the development of a new plaster die casting process that combines pressurization and vibration for prototyping of die castings, and with a plaster die casting machine that has a structure similar to that of a die casting machine. The machine utilizes an oil cylinder for pressurization and a magnetic actuator for vibration. A rapid prototyped pattern is made by the laminated object manufacturing (LOM) process to prepare a plaster mold. In the process, a plunger in the developed machine simultaneously pressurizes and vibrates the molten metal to fill the plaster mold completely and to facilitate the creation of nuclei in the molten metal, respectively. The developed machine has produced a prototype of an end clutch cover with remarkable improvement in mechanical properties.