锻造油压机液压控制系统的关键技术研究电子书

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毕业论文范文题目： 锻造油压机液压控制系统的关键技术研究电子书，论文范文关键词： 锻造油压机液压控制系统的关键技术研究电子书
锻造油压机液压控制系统的关键技术研究电子书毕业论文范文介绍开始：
　　锻造油压机液压控制系统的关键技术研究电子书
　　摘要
　　锻造液压机的装备水平是衡量一个国家机械制造水平和能力的标志之一。锻造油压机以其速度快、精度高、自动化程度高等特点成为目前大型自由锻锤及中小型传统水压机的更新换代产品。液压控制系统是提高锻造油压机工作特性及锻件产品质量的关键设备，开展锻造油压机液压控制系统工作特性和控制特性的研究具有重要的理论意义和实际应用价值。它可以为现代化锻造油压机液压系统优化设计提供技术支撑；以改进现有的锻造油压机液压控制系统设计，改善系统性能，优化控制技术，以提高锻造油压机的整体水平。本文针对现代化锻造油压机快速、无冲击及高精度的要求，开展了锻造油压机工作特性影响因素和锻造油压机控制特性两方面的专题研究。利用机理建模技术，进行了锻造油压机液压控制系统及元件的动态建模研究。建立了插装类方向阀、插装类压力阀、三级插装阀、电液比例插装阀、蓄能器、管道、执行机构以及油压机机架振动等关键元件的数学模型。在此基础上，进行了不同快锻回路液压控制系统数学模型的研究，为锻造油压机工作特性影响因素和控制特性研究奠定理论基础。从工作速度、关键元件的动态特性、建压时间、卸压时间、各阀间的协调控制和电液比例控制的系统设计等方面，通过大量的仿真和试验研究，对锻造油压机快速性的影响因素进行了研究。从卸压卸荷冲击、管道压力冲击和失荷冲击振动三个
　　方面进行了锻造油压机冲击振动的影响因素研究，并结合生产现场实测数据，利用仿真技术，研究了理想卸压曲线、不同位置管道对系统冲击振动的影响规律，减少失荷造成压机和基础振动的措施等。研究了锻造油压机阀控缸控制特性，利用液压系统独立插装单元控制工作缸的特殊性，设计控制器参数，优化了锻造油压机液压控制系统的控制特性，并减小了回程缸的压力跃变，提高了系统的快速性，在实际锻造油压机生产过程中得到了应用，验证了所提出的控制策略的正确性和适用性。在仿真和实验研究的基础上，研究了开关型快锻回路、差动溢流快锻回路、比例控制快锻回路的控制特性，分析和比较它们的特点及控制特性，并给出相应的计算机快锻工序。对新型的节能型蓄能器快锻回路进行了仿真和试验研究，提出了计
　　算选择蓄能器的依据，证明了利用蓄能器实现快锻节能的可行性，验证了蓄能器及蓄能器快锻回路数学模型的正确性。
　　关键词锻造；液压机；建模；插装阀；液压系统
　　
　　目录
　　摘要······························································································································I
　　Abstract························································································································· III
　　第1 章绪论···················································································································· 1
　　1.1 引言······················································································································ 1
　　1.2 国内外技术发展概况··························································································· 2
　　1.2.1 锻造液压机···································································································· 2
　　1.2.2 锻造液压机机组组成····················································································· 4
　　1.2.3 液压系统········································································································ 8
　　1.3 锻造油压机综合性能概述及存在的主要问题·················································· 12
　　1.3.1 工作特性······································································································ 12
　　1.3.2 控制特性······································································································ 15
　　1.3.3 存在的主要问题·························································································· 16
　　1.4 课题研究的意义、目的及来源········································································· 18
　　1.5 本文研究的主要内容························································································· 19
　　第2 章锻造油压机液压控制系统关键元件建模研究················································ 21
　　2.1 建模方法的确定································································································· 21
　　2.2 插装类方向阀数学模型····················································································· 22
　　2.2.1 插装单向阀数学模型··················································································· 22
　　2.2.2 电磁换向插装阀数学模型··········································································· 25
　　2.3 插装类压力阀数学模型····················································································· 29
　　2.3.1 溢流插装阀数学模型··················································································· 29
　　2.3.2 电磁卸荷溢流插装阀数学模型··································································· 31
　　2.4 三级插装阀数学模型························································································· 32
　　2.4.1 进液型三级插装阀组··················································································· 33
　　2.4.2 排液型三级插装阀组··················································································· 38
　　2.5 电液比例插装阀数学模型················································································· 40
　　2.5.1 电液比例阀概述·························································································· 40
　　2.5.2 电液比例插装阀数学模型··········································································· 44
　　2.6 管道数学模型···································································································· 49
　　2.6.1 管道影响及其分析方法··············································································· 49
　　2.6.2 改进型管道集中参数模型的建立······························································· 51
　　2.7 执行机构············································································································ 53
　　2.8 数学模型功能图································································································· 54
　　2.9 本章小结············································································································ 54
　　第3 章锻造油压机快速性影响因素研究··································································· 56
　　3.1 工作速度············································································································ 56
　　3.2 关键元件动态特性····························································································· 56
　　燕山大学工学博士学位论文
　　VI
　　3.2.1 电磁换向插装阀开关特性··········································································· 57
　　3.2.2 三级插装阀开关特性··················································································· 62
　　3.2.3 电液比例插装阀·························································································· 64
　　3.3 建压时间············································································································ 65
　　3.3.1 弹性体建压时间·························································································· 65
　　3.3.2 系统建压时间······························································································ 67
　　3.4 卸载时间············································································································ 75
　　3.5 各阀间的协调控制····························································································· 75
　　3.6 电液比例控制系统的设计················································································· 77
　　3.6.1 电液比例插装阀的选用··············································································· 77
　　3.6.2 液压系统固有频率的校核··········································································· 79
　　3.7 本章小结············································································································ 81
　　第4 章锻造油压机冲击振动影响因素研究······························································· 83
　　4.1 卸压卸荷冲击···································································································· 83
　　4.1.1 卸压卸荷系统研究······················································································ 83
　　4.1.2 卸压曲线研究······························································································ 86
　　4.2 管道压力冲击···································································································· 86
　　4.2.1 主泵口管道·································································································· 87
　　4.2.2 工作缸进油管道·························································································· 89
　　4.2.3 工作缸排油管道·························································································· 90
　　4.3 失荷冲击振动···································································································· 90
　　4.3.1 锻造油压机振动力学模型··········································································· 90
　　4.3.2 仿真研究······································································································ 92
　　4.4 本章小结············································································································ 93
　　第5 章锻造油压机控制特性研究··············································································· 95
　　5.1 锻造油压机阀控缸特性研究············································································· 95
　　5.1.1 锻造油压机阀控不对称缸静态特性··························································· 95
　　5.1.2 锻造油压机阀控缸压力特性····································································· 100
　　5.2 常锻时控制性能实验研究··············································································· 103
　　5.2.1 电液比例控制系统常锻性能实验····························································· 103
　　5.2.2 半电液比例控制系统常锻性能实验························································· 104
　　5.3 半自动控制时控制性能实验研究··································································· 106
　　5.4 快锻时控制性能研究······················································································· 106
　　5.4.1 开关控制快锻回路···················································································· 107
　　5.4.2 差动溢流快锻回路···················································································· 112
　　5.4.3 比例控制快锻回路···················································································· 117
　　5.4.4 蓄能器快锻回路························································································ 119
　　5.5 本章小结·········································································································· 126

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