【摘要】：線性摩擦焊是航空發(fā)動機(jī)和燃?xì)廨啓C(jī)整體葉盤制造的關(guān)鍵技術(shù),已受到越來越多的重視,尤其是航空發(fā)動機(jī)和燃?xì)廨啓C(jī)重大專項(xiàng)以及中國制造2025的提出更加奠定了線性摩擦焊研究的重要地位。線性摩擦焊裝備是開展線性摩擦焊工藝研究的基礎(chǔ)。然而,由于國外技術(shù)的壟斷、國內(nèi)技術(shù)研發(fā)的緩慢以及常見的液壓式線性摩擦焊裝備的價格高昂,國內(nèi)能擁有線性摩擦焊裝備并真正開展線性摩擦焊工藝研究的研究機(jī)構(gòu)少之甚少,而成本較低的機(jī)械式線性摩擦焊裝備由于調(diào)幅的難題逐漸被忽視。而一旦調(diào)幅問題得以解決,機(jī)械式線性摩擦焊裝備一定會因成本優(yōu)勢重新得到重視。本文將從調(diào)幅這一問題切入,以獲得可行的機(jī)械式線性摩擦裝備方案。本文設(shè)計了一種機(jī)械式調(diào)幅線性摩擦焊裝備,主要包括可調(diào)幅振動系統(tǒng)和液壓施力系統(tǒng)。可調(diào)幅振動系統(tǒng)提供線性摩擦焊過程中焊件的高頻小幅往復(fù)運(yùn)動,其主要包括由變相機(jī)構(gòu)連接的兩個曲柄滑塊機(jī)構(gòu)、橫梁和振動平臺。振動平臺的振幅由兩個滑塊的平均位移決定,而兩個滑塊的平均位移可通過調(diào)節(jié)兩個曲柄的相位差來改變。當(dāng)振幅調(diào)節(jié)為零,振動平臺就會停在定位點(diǎn)。針對系統(tǒng)在定位點(diǎn)的微幅振動現(xiàn)象,本文對其產(chǎn)生原因進(jìn)行了分析,并通過改進(jìn)連桿長度來減小此微幅振動以消除其對振動平臺定位精度的影響。為了得到可調(diào)幅振動系統(tǒng)的動力學(xué)特性,對其進(jìn)行了運(yùn)動學(xué)、動力學(xué)分析和建模以及Simulink仿真。仿真結(jié)果表明,可調(diào)幅振動系統(tǒng)具有大負(fù)載(40kN摩擦力)、快速調(diào)幅和較高定位精度能力,能滿足機(jī)械式線性摩擦焊裝備的需求。液壓施力系統(tǒng)提供線性摩擦焊過程中焊件間的正壓力,并需要具有快速、準(zhǔn)確和穩(wěn)定的控制性能。為此,本文對液壓施力系統(tǒng)進(jìn)行了數(shù)學(xué)建模以得到其傳遞函數(shù),并使用粒子群優(yōu)化(PSO,Particle Swarm Optimization)算法優(yōu)化得到的PID控制器對液壓施力系統(tǒng)進(jìn)行控制,得到了較優(yōu)的控制性能。為了保證設(shè)計的可靠性,本文對裝備的關(guān)鍵零部件進(jìn)行了校核計算和有限元分析,結(jié)果表明:各關(guān)鍵零部件均通過校核。上述工作表明,本文設(shè)計的機(jī)械式調(diào)幅線性摩擦焊裝備能滿足線性摩擦焊工藝需求,且裝備可靠,能為機(jī)械式線性摩擦焊裝備的制造提供理論及技術(shù)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.
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG439.8

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 謝雅;黃中華;左金玉;;三相交流異步電機(jī)矢量控制系統(tǒng)仿真建模[J];湖南工程學(xué)院學(xué)報(自然科學(xué)版);2013年01期

2 羅t，

本文編號：2262702