机械式调幅线性摩擦焊装备设计与仿真
发布时间：2018-10-10 17:42
【摘要】：线性摩擦焊是航空发动机和燃气轮机整体叶盘制造的关键技术,已受到越来越多的重视,尤其是航空发动机和燃气轮机重大专项以及中国制造2025的提出更加奠定了线性摩擦焊研究的重要地位。线性摩擦焊装备是开展线性摩擦焊工艺研究的基础。然而,由于国外技术的垄断、国内技术研发的缓慢以及常见的液压式线性摩擦焊装备的价格高昂,国内能拥有线性摩擦焊装备并真正开展线性摩擦焊工艺研究的研究机构少之甚少,而成本较低的机械式线性摩擦焊装备由于调幅的难题逐渐被忽视。而一旦调幅问题得以解决,机械式线性摩擦焊装备一定会因成本优势重新得到重视。本文将从调幅这一问题切入,以获得可行的机械式线性摩擦装备方案。本文设计了一种机械式调幅线性摩擦焊装备,主要包括可调幅振动系统和液压施力系统。可调幅振动系统提供线性摩擦焊过程中焊件的高频小幅往复运动,其主要包括由变相机构连接的两个曲柄滑块机构、横梁和振动平台。振动平台的振幅由两个滑块的平均位移决定,而两个滑块的平均位移可通过调节两个曲柄的相位差来改变。当振幅调节为零,振动平台就会停在定位点。针对系统在定位点的微幅振动现象,本文对其产生原因进行了分析,并通过改进连杆长度来减小此微幅振动以消除其对振动平台定位精度的影响。为了得到可调幅振动系统的动力学特性,对其进行了运动学、动力学分析和建模以及Simulink仿真。仿真结果表明,可调幅振动系统具有大负载(40kN摩擦力)、快速调幅和较高定位精度能力,能满足机械式线性摩擦焊装备的需求。液压施力系统提供线性摩擦焊过程中焊件间的正压力,并需要具有快速、准确和稳定的控制性能。为此,本文对液压施力系统进行了数学建模以得到其传递函数,并使用粒子群优化(PSO,Particle Swarm Optimization)算法优化得到的PID控制器对液压施力系统进行控制,得到了较优的控制性能。为了保证设计的可靠性,本文对装备的关键零部件进行了校核计算和有限元分析,结果表明:各关键零部件均通过校核。上述工作表明,本文设计的机械式调幅线性摩擦焊装备能满足线性摩擦焊工艺需求,且装备可靠,能为机械式线性摩擦焊装备的制造提供理论及技术支持。
[Abstract]:Linear friction welding (LFW) is a key technology in the manufacture of aeroengine and gas turbine integral vane, and has been paid more and more attention. Especially, the important project of aeroengine and gas turbine and the 2025 made in China have established the important position of linear friction welding. Linear friction welding equipment is the basis of research on linear friction welding technology. However, due to the monopoly of foreign technology, the slow development of domestic technology and the high price of common hydraulic linear friction welding equipment, There are few research institutions which can have linear friction welding equipment and do the research of linear friction welding technology in China, while the low cost mechanical linear friction welding equipment is gradually ignored because of the difficulty of amplitude modulation. Once the amplitude modulation problem is solved, the mechanical linear friction welding equipment will be paid more attention to because of its cost advantage. In order to obtain a feasible scheme of mechanical linear friction equipment, the problem of amplitude modulation is discussed in this paper. In this paper, a kind of mechanical linear friction welding equipment is designed, which includes amplitude adjustable vibration system and hydraulic force system. The adjustable amplitude vibration system provides the high frequency and small reciprocating motion of the welds during the linear friction welding process, which mainly includes two crank slider mechanisms, beams and vibration platforms connected by the variable phase mechanism. The amplitude of the vibration platform is determined by the average displacement of the two sliders, and the average displacement of the two sliders can be changed by adjusting the phase difference between the two crank. When the amplitude is adjusted to zero, the vibration platform stops at the location point. In this paper, the causes of the micro-amplitude vibration of the system at the positioning point are analyzed, and the influence of the micro-amplitude vibration on the positioning accuracy of the vibration platform is eliminated by improving the length of the connecting rod to reduce the vibration. In order to obtain the dynamic characteristics of the amplitude adjustable vibration system, kinematics, dynamic analysis, modeling and Simulink simulation are carried out. The simulation results show that the adjustable amplitude vibration system has the ability of large load (40kN friction force), fast amplitude modulation and high positioning accuracy, and can meet the requirements of mechanical linear friction welding equipment. The hydraulic force system provides positive pressure between welds during linear friction welding, and requires fast, accurate and stable control performance. In this paper, the mathematical model of hydraulic force system is established to get its transfer function, and the PID controller optimized by particle swarm optimization (PSO,Particle Swarm Optimization) is used to control the hydraulic force system, and the better control performance is obtained. In order to ensure the reliability of the design, the key parts of the equipment are checked and analyzed by finite element method. The results show that all the key parts are checked. The above work shows that the mechanical linear friction welding equipment designed in this paper can meet the requirements of the linear friction welding process, and the equipment is reliable, which can provide theoretical and technical support for the manufacture of mechanical linear friction welding equipment.
【学位授予单位】：深圳大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG439.8
[Abstract]:Linear friction welding (LFW) is a key technology in the manufacture of aeroengine and gas turbine integral vane, and has been paid more and more attention. Especially, the important project of aeroengine and gas turbine and the 2025 made in China have established the important position of linear friction welding. Linear friction welding equipment is the basis of research on linear friction welding technology. However, due to the monopoly of foreign technology, the slow development of domestic technology and the high price of common hydraulic linear friction welding equipment, There are few research institutions which can have linear friction welding equipment and do the research of linear friction welding technology in China, while the low cost mechanical linear friction welding equipment is gradually ignored because of the difficulty of amplitude modulation. Once the amplitude modulation problem is solved, the mechanical linear friction welding equipment will be paid more attention to because of its cost advantage. In order to obtain a feasible scheme of mechanical linear friction equipment, the problem of amplitude modulation is discussed in this paper. In this paper, a kind of mechanical linear friction welding equipment is designed, which includes amplitude adjustable vibration system and hydraulic force system. The adjustable amplitude vibration system provides the high frequency and small reciprocating motion of the welds during the linear friction welding process, which mainly includes two crank slider mechanisms, beams and vibration platforms connected by the variable phase mechanism. The amplitude of the vibration platform is determined by the average displacement of the two sliders, and the average displacement of the two sliders can be changed by adjusting the phase difference between the two crank. When the amplitude is adjusted to zero, the vibration platform stops at the location point. In this paper, the causes of the micro-amplitude vibration of the system at the positioning point are analyzed, and the influence of the micro-amplitude vibration on the positioning accuracy of the vibration platform is eliminated by improving the length of the connecting rod to reduce the vibration. In order to obtain the dynamic characteristics of the amplitude adjustable vibration system, kinematics, dynamic analysis, modeling and Simulink simulation are carried out. The simulation results show that the adjustable amplitude vibration system has the ability of large load (40kN friction force), fast amplitude modulation and high positioning accuracy, and can meet the requirements of mechanical linear friction welding equipment. The hydraulic force system provides positive pressure between welds during linear friction welding, and requires fast, accurate and stable control performance. In this paper, the mathematical model of hydraulic force system is established to get its transfer function, and the PID controller optimized by particle swarm optimization (PSO,Particle Swarm Optimization) is used to control the hydraulic force system, and the better control performance is obtained. In order to ensure the reliability of the design, the key parts of the equipment are checked and analyzed by finite element method. The results show that all the key parts are checked. The above work shows that the mechanical linear friction welding equipment designed in this paper can meet the requirements of the linear friction welding process, and the equipment is reliable, which can provide theoretical and technical support for the manufacture of mechanical linear friction welding equipment.
【学位授予单位】：深圳大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG439.8
【参考文献】
相关期刊论文 前10条
1 谢雅;黄中华;左金玉;;三相交流异步电机矢量控制系统仿真建模[J];湖南工程学院学报(自然科学版);2013年01期
2 罗t，
本文编号：2262702
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