本文選題：鍛造油壓機(jī)　切入點(diǎn)：開式泵控系統(tǒng)　出處：《燕山大學(xué)》2016年博士論文

【摘要】：鍛造行業(yè)中所消耗的巨大能源以及它向大氣中排放的污染物,一直都是我國(guó)工業(yè)發(fā)展過程所必須解決的問題和難題,也是想要實(shí)現(xiàn)工業(yè)可持續(xù)發(fā)展的前提條件。與比例閥控系統(tǒng)、閉式泵控系統(tǒng)、直驅(qū)式容積控制電液伺服系統(tǒng)相比,開式泵控鍛造油壓機(jī)液壓控制系統(tǒng)可以降低裝機(jī)功率、減小冷卻補(bǔ)油系統(tǒng)和簡(jiǎn)化系統(tǒng)結(jié)構(gòu),能夠明顯提升節(jié)能效果,并且保留了傳統(tǒng)系統(tǒng)響應(yīng)快、精度高、穩(wěn)定性強(qiáng)的優(yōu)勢(shì)。對(duì)于鍛造行業(yè)來說,研究開式泵控鍛造油壓機(jī)液壓控制系統(tǒng)的容積控制特性具有重要的理論意義,在自由鍛、模鍛、多向模鍛等設(shè)備中應(yīng)用開式泵控鍛造油壓機(jī)液壓控制系統(tǒng)具有積極的現(xiàn)實(shí)意義。鍛造油壓機(jī)負(fù)載和工藝條件具有時(shí)變性和隨機(jī)性,故要求液壓控制系統(tǒng)在不同負(fù)載與工藝條件下都具有良好的控制特性。本文以開式泵控鍛造油壓機(jī)系統(tǒng)為研究對(duì)象,采用理論分析和實(shí)驗(yàn)研究相結(jié)合的方法,以比例變量徑向柱塞泵特性、油壓機(jī)系統(tǒng)特性和鍛件負(fù)載時(shí)變特性為基礎(chǔ),針對(duì)開式泵控鍛造油壓機(jī)系統(tǒng)卸壓沖擊抑制、負(fù)載容腔獨(dú)立控制、管路系統(tǒng)動(dòng)態(tài)特性控制進(jìn)行研究,分析系統(tǒng)控制方法及響應(yīng)特性。對(duì)開式泵控鍛造油壓機(jī)系統(tǒng)卸壓沖擊問題進(jìn)行研究,建立按能量規(guī)律和流量規(guī)律卸壓的卸壓曲線數(shù)學(xué)模型,分析不同卸壓曲線在不同卸壓階段的特性�；诓煌A段對(duì)壓力下降梯度的不同需求,提出開式泵控鍛造油壓機(jī)組合式卸壓曲線,規(guī)劃變量泵偏心量,實(shí)現(xiàn)系統(tǒng)平穩(wěn)卸壓。對(duì)開式泵控鍛造油壓機(jī)系統(tǒng)負(fù)載容腔獨(dú)立控制問題進(jìn)行研究。建立主缸位置與回程缸壓力復(fù)合控制的負(fù)載容腔獨(dú)立控制模型,分析主缸系統(tǒng)與回程缸系統(tǒng)耦合作用對(duì)活動(dòng)橫梁位置控制精度的影響,提出前饋負(fù)載同步補(bǔ)償解耦控制方法,提升系統(tǒng)快鍛位置控制精度。對(duì)開式泵控鍛造油壓機(jī)系統(tǒng)管路系統(tǒng)動(dòng)態(tài)特性控制問題進(jìn)行研究。建立包含管路的油壓機(jī)系統(tǒng)模型,分析系統(tǒng)的頻域特性,提出基于流量壓力復(fù)合控制的前饋補(bǔ)償控制方法,綜合鍛件負(fù)載特性,實(shí)現(xiàn)對(duì)管路系統(tǒng)快鍛過程帶載時(shí)壓力上升慢導(dǎo)致壓下量不足的改善。通過0.6MN鍛造油壓機(jī)實(shí)驗(yàn)平臺(tái)實(shí)驗(yàn)驗(yàn)證提出的組合式卸壓曲線卸壓控制方法、基于前饋同步補(bǔ)償解耦控制的負(fù)載容腔獨(dú)立控制方法、基于流量壓力復(fù)合控制的管路系統(tǒng)動(dòng)態(tài)特性控制方法的有效性。
[Abstract]:The huge energy consumed in the forging industry and the pollutants it emits into the atmosphere have always been the problems and problems that must be solved in the process of industrial development in our country, and are also the preconditions to realize the sustainable development of industry.Compared with proportional valve control system, closed pump control system and direct-drive volume control electro-hydraulic servo system, the open pump controlled forging press hydraulic control system can reduce the loading power, reduce cooling and oil filling system and simplify the system structure.It can obviously improve the effect of energy saving, and retain the advantages of fast response, high precision and strong stability of traditional system.For the forging industry, it is of great theoretical significance to study the volume control characteristics of hydraulic control system of open pump controlled forging hydraulic press.The application of hydraulic control system of open pump controlled forging press in multi-directional die forging equipment has positive practical significance.The load and process conditions of forging hydraulic press are time-varying and random, so the hydraulic control system is required to have good control characteristics under different load and process conditions.In this paper, the open pump controlled forging hydraulic press system is taken as the research object. The method of combining theoretical analysis with experimental research is adopted, and the characteristics of proportional variable radial piston pump, hydraulic press system and forging load time-varying characteristic are taken as the basis.In this paper, the control methods and response characteristics of open pump controlled forging hydraulic press system are studied, including the suppression of pressure relief impact, the independent control of load cavity and the dynamic characteristic control of pipeline system.In this paper, the pressure relief impact problem of open pump controlled forging hydraulic press system is studied, and the mathematical model of pressure relief curve is established according to the law of energy and flow, and the characteristics of different pressure relief curves in different pressure relief stages are analyzed.Based on the different demands of pressure descending gradient in different stages, the combined pressure relief curve of open pump-controlled forging press is proposed, and the eccentricity of variable pump is planned to realize the steady pressure relief of the system.The independent control of open pump-controlled forging press system is studied.An independent control model of load cavity for compound control of main cylinder position and return cylinder pressure is established. The influence of coupling action between main cylinder system and return cylinder system on the accuracy of position control of moving beam is analyzed. A decoupling control method for synchronous compensation of feedforward load is proposed.Raise the precision of position control for fast forging of the system.The dynamic characteristic control of pipeline system of open pump controlled forging press system is studied.The hydraulic press system model including pipeline is established, and the frequency domain characteristic of the system is analyzed. A feedforward compensation control method based on flow-pressure compound control is proposed to synthesize the forgings' load characteristics.The pressure rising slowly during the rapid forging process of pipeline system leads to the improvement of insufficient reduction.The combined pressure relief control method is verified by the experiment platform of 0.6MN forging oil press, and the load cavity independent control method based on feedforward synchronous compensation decoupling control is presented.The effectiveness of dynamic characteristic control method for pipeline system based on flow and pressure compound control.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TG315.4

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