注塑机双肘杆锁模机构的优化设计

推导了双曲肘合模机构行程比和力的放大比与肘杆尺寸及肘杆轴线夹角的关系公式,并应用MATLAB优化模块探讨了肘杆机构的尺寸优化问题.所取得的满意解明显优于现行设计.为实际工程设计方案的选择提供了依据.     

自动平压平模切机双肘杆机构动态分析

根据自动平压平模切机的受力特点，提出了一种模切机动态响应分析的方法，它利用有限元分析求解模切压力与动平台位移的关系，再利用动力学仿真来分析双肘杆机构运动副反力和曲轴阻力矩的变化过程，并求解模切机构的极限工作速度和最大模切荷载。该方法对于同类冲压机械的工作原理的分析与机械设计的研究有重要意义。     

注塑机负后角型肘杆机构的优化及特性分析

讨论新型的注塑机负后角肘杆机构的特点,并通过MATLAB软件分别对正后角和负后角肘杆机构进行多目标规划问题的优化计算.分别利用MATLAB及Pro/E软件对肘杆机构进行运动仿真,并对比两种结构的运动与力学特性.对负后角型注塑机合模机构的性能分析、设计及优化方法均作了详细介绍.     

新型模切与烫印双肘杆机构研究

本文首先对新型模切与烫印机的双肘杆机构的性能参数与结构参数进行了详细的分析,在分析的基础上建立了优化的目标函数,提出了优选结构参数的综合方法,通过计算得到符合设计要求的结构参数。本文所介绍的分析与优化方法,对于分析与改进模切与烫印机的主要参数具有普遍意义。     

基于遗传算法的注塑机肘杆机构优化设计

遗传算法对于多参数系统优化设计具有较好的鲁棒性。针对注塑机肘杆机构优化设计的问题,通过对注塑机单肘杆合模装置的运动分析,建立了数学模型。以肘杆机构长度最小为目标,利用遗传算法进行了优化设计,并与常规设计方法进行了比较。研究结果表明,基于遗传算法的优化设计体现出了明显的优化效果,具有一定的实际应用价值。     

平压平模切机的模切力分析

本文从动态静力学的角度出发,得出了双肘杆机构能够输出的模切力理论曲线,为模切力的进一步分析提供了借鉴的依据或基础;同时分析了影响模切压力的相关因素,以及从腾跳的角度分析了系统的稳定性,得出了在不考虑速度波动与惯性力不平衡等情况下该机构的极限工作速度.另外,用VC编制了该机构运动分析软件.     

油缸驱动肘杆机构合模部件开模瞬时停顿的研究

油缸驱动肘杆机构合模部件触动系统在注塑成型的开模过程中出现的瞬时停顿的不连续运动现象,分析了肘杆机构合模部件弹性变形能的实质,从理论和实例上对瞬时停顿的不连续运动现象进行论证,说明主要原因是由于油缸动力驱动系统与肘杆机构合模部件弹性力学的两者之间的动态性能不匹配所引起。提出的油马达—滚珠丝杆—肘杆机构等组合的传动系统,改变了合模部件弹性恢复能量转化型式,达到弹性恢复不干涉开模运动速度,实现开模的连续运动;传动系统组成型式的改变,打破传动的油缸驱动肘杆机构合模部件传动系统的增力比的设计极限,由传统的约20倍可增大到约100倍,实现肘杆机构合模部件节能降耗驱动的突破,拓展了运动性能优化设计空间。     

基于模态分析的卧式平压平模切机模切精度分析

模切机是重要的印后加工设备,其两个重要的性能指标是模切速度和模切精度。首先,介绍卧式平压平模切机和模切单元的组成与工作原理,并详细介绍模切单元双肘杆机构;其次,概述影响模切精度的因素;最后,应用ANSYS对模切单元进行模态分析,发现蜗轮蜗杆啮合产生的激振频率会造成设备振动而影响模切精度,因此开机与运行过程中的频率需避免与激振频率重合。     

上三角肘杆式主驱动机构的优化

针对伺服压力机主驱动机构的主要杆件对机构运动学和动力学特性的影响,提出一种优化结构的方法以提高机构的机械效益。基于压力机的主驱动机构的工作原理,建立压力机主驱动机构的上三角肘杆机构的ADAMS仿真模型。建立上三角肘杆机构的正运动学数学模型,同时运用MATLAB编写计算程序进行数值计算,得到上三角肘杆机构在不同杆长条件下输出端的运动变化特性曲线,验证连杆尺寸的设计具有合理性。进行上三角肘杆机构的动力学特性分析,得到各个铰节点的受力变化情况。建立机构的参数化优化模型,以机械效益最大为优化目标,计算获得优化后的杆长尺寸,并得到上三角肘杆式主驱动机构输出力的放大倍数提高了2.75倍。     

热成型机曲柄肘杆开合模机构的设计及仿真

在充分分析热成型工艺对开合模机构性能要求的基础上。设计了一种新型的曲柄肘杆开合模机构,并采用矢量法建立了数学模型;在MATLAB软件中编程求解,对机构进行仿真分析。得到了其运动学及动力学参数,并验证了曲柄肘杆开合模机构设计的合理性。     

模切机肘杆机构连杆的有限元分析

针对MP1040B型模切机肘杆机构中的连杆在使用中破损故障时有发生,在运动学和动力学分析的基础上,利用有限元方法进行了强度分析,结果表明,当在正常模切力2 450 kN时连杆的强度满足要求,当在极限模切力3 136 kN时连杆的强度不满足要求,分析结果为结构的改进或材料的选择提供了依据.     

The concurrent implementation of high velocity control performance and high energy efficiency for hydraulic injection moulding machines

A high servo control response and a high energy efficiency, which are difficult to achieve simultaneously, are requested in hydraulic servo systems of current hydraulic injection moulding machines. This investigation develops new solutions to concurrently implement energy-saving control and velocity control for simultaneously realising high velocity control response and high energy efficiency for injection moulding machines. Two different hydraulic pump systems, including a variable displacement pump and a variable rotational speed pump, are developed and in each one of them two different energy-saving control concepts, such as load-sensing control and constant supply pressure control, are implemented. Thus, for verifying the feasibility of the integrated control systems and comparing the energy-saving effects, velocity control of the hydraulic cylinder can be integrated with four different energy-saving control systems (ESCSs) and also the conventional hydraulic system without energy-saving control. A fuzzy sliding mode control that can simplify the complex fuzzy rule bases is used for solving the complex two-input two-output systems. The experimental results show the excellent performance of the integrated concurrent control systems.     

石膏砌块成型机的虚拟样机设计

介绍了石膏砌块成型机生产线,重点介绍了石膏空心砌块成型机的结构特点,利用SolidWork强大的参数化建模功能,建立了成型机的虚拟样机模型,并在此基础上进行了运动仿真。该设计为成型机的优化设计及性能分析提供了参考。     

事件驱动的流水线建模与质检机器配置优化

数字孪生车间环境下获取生产数据更加便捷,使系统运行过程中收集机器故障、质检报废等扰动事件成为可能.为了科学评估并及时应对扰动事件对系统性能的影响,面向考虑质检报废的流水线,研究流水线性能评估与质检机器配置优化问题.考虑流水线中的质量检测操作,定义了质检报废事件,定量分析了机器故障与质检报废等扰动事件对系统产出的影响,建...     

基于DSP的模块化橡塑机械控制器

介绍了一种基于DSP的模块化橡塑机械控制器，它具有可扩展性强、灵活性好、易于维护等特点，只要做很少的模块扩展与软件修改工作，就可以满足各类橡塑机械控制器的要求。     

半导体生产线动态调度方法研究

为了满足半导体生产线多目标优化要求,提出了多目标优化动态调度规则。它由正常状态调度规则、瓶颈设备较低在制品水平的调度规则、非瓶颈设备较高在制品水平的调度规则、多批加工设备调度规则以及紧急工件调度规则五种类型的调度规则组成。使用具有半导体生产线本质特征的简化模型,将多目标优化动态调度规则与先入先出法、最早交货期法、临界值法进行了比较,结果表明,多目标优化动态调度规则能够改善半导体生产线的整体性能,更好地优化模型的生产率、加工周期与在制品水平,最终提高准时交货率。     

Tricept机器人的尺度综合方法研究

Tricept机器人是目前商业上最为成功的并联机器人之一。提出一种Tricept机器人中三自由度并联机构的最优尺度综合方法。该方法首先导出尺度参数间的关系,其次构造一种均衡条件数全域均值及其极差间矛盾的综合操作性能指标,进而将尺度综合问题归结为一类双参数优化问题。该方法对掌握这类及其他并联机构的运动学设计理论有一定指导意义。     

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.     

Integrated control of clamping force and energy-saving in hydraulic injection moulding machines using decoupling fuzzy sliding-mode control

The objective of this research is to implement a novel parallel control of clamping force and energy-saving in hydraulic injection moulding machines (HIMMs) in order to simultaneously achieve accurate force control response and high energy efficiency. In order to verify the feasibility of the integrated control system and compare energy-saving effects, the clamping force control of HIMMs can be integrated with two different energy-saving control systems or integrated with a conventional hydraulic system without energy-saving control. The overall control system is a coupled two-input two-output system. Therefore, a decoupling fuzzy sliding-mode control (DFSMC) strategy, which can reduce the fuzzy rule numbers and counteract the coupling effects, is developed for the integrated control of HIMMs. The experimental results show the outstanding performance of the parallel control in HIMMs with DFSMC .     

Simultaneous scheduling of machines and vehicles in an FMS environment with alternative routing

Scheduling of flexible manufacturing systems is a well-known NP-hard problem which is very complex, due to additional considerations like material handling, alternative routing, and alternative machines. Improvement in the performance of a flexible manufacturing system can be expected by efficient utilization of its resources, by proper integration and synchronization of their scheduling. Differential evolution is a powerful tool which proved itself as a better alternative for solving optimization problems like scheduling. In this paper, the authors addressed simultaneous scheduling of both machines and material handling system with alternative machines for the makespan minimization objective. The authors proposed a machine selection heuristic and a vehicle assignment heuristic which are incorporated in the differential evolution approach to assign the tasks, to appropriate machine and vehicle, and to minimize cycle time.