DP600管材充液壓形回彈規(guī)律研究
發(fā)布時(shí)間：2019-03-11 20:37
【摘要】：汽車工業(yè)、航空航天工業(yè)作為高端制造業(yè)和先進(jìn)技術(shù)制造的代表,對(duì)制造技術(shù)的要求越來越高,形狀結(jié)構(gòu)復(fù)雜、性能要求極高、一體化成形、結(jié)構(gòu)輕量化設(shè)計(jì)的薄壁管件需求越來越多,此類零件的制造多采用傳統(tǒng)沖壓和焊接工藝。隨著技術(shù)的進(jìn)步和傳統(tǒng)拼焊技術(shù)缺點(diǎn)的顯現(xiàn),在此背景下充液壓形技術(shù)發(fā)展了內(nèi)高壓成形技術(shù)的優(yōu)勢(shì),克服了內(nèi)高壓成形技術(shù)的缺點(diǎn),成為制造薄壁管件技術(shù)的研究熱點(diǎn);然而大尺寸薄壁管件、精密薄壁管件對(duì)成形精度和裝配性能的要求較高,管材充液壓形回彈的研究具有一定的意義。本文以DP600高強(qiáng)鋼管為坯料進(jìn)行管材充液壓形的回彈規(guī)律研究。首先,通過理論分析揭示了內(nèi)壓、圓角半徑、壁厚對(duì)管材充液壓形回彈的影響規(guī)律及機(jī)理,并給出了內(nèi)壓、圓角半徑、壁厚和回彈量、環(huán)向力、彎矩之間的數(shù)學(xué)表達(dá)式;其次,利用有限元模擬分析給出了內(nèi)壓、圓角半徑、壁厚對(duì)回彈量、環(huán)向力和彎矩的影響規(guī)律,驗(yàn)證了理論分析的正確性,并給出了內(nèi)壓、圓角半徑、壁厚對(duì)管材充液壓形回彈變形輪廓的影響規(guī)律;最后,基于理論分析和有限元模擬結(jié)果設(shè)計(jì)實(shí)驗(yàn)進(jìn)行實(shí)驗(yàn)研究,實(shí)驗(yàn)結(jié)果較好地吻合了理論分析和有限元模擬結(jié)果,為控制管材充液壓形的回彈提供一定的參考。研究結(jié)果表明:管材充液壓形的回彈隨著內(nèi)壓的增大呈現(xiàn)出先增大后減小的規(guī)律,回彈最大時(shí)的內(nèi)壓為回彈臨界內(nèi)壓;管材充液壓形的回彈隨著圓角半徑的增大而減小;另外,圓角半徑?jīng)Q定著回彈臨界內(nèi)壓的大小,圓角半徑越大,回彈臨界內(nèi)壓越小,這表明圓角半徑和內(nèi)壓對(duì)管材充液壓形回彈的影響是相互耦合的;壁厚對(duì)管材充液壓形的回彈的影響受到內(nèi)壓的影響,內(nèi)壓決定著壁厚對(duì)管材充液壓形回彈影響的規(guī)律性。內(nèi)壓、圓角半徑對(duì)管材充液壓形回彈的影響機(jī)理是通過改變管材充液壓形時(shí)環(huán)向力和彎矩的大小和方向,進(jìn)而使管材以拉彎、壓彎、純彎等不同類型的變形形式進(jìn)行變形;壁厚通過改變管材充液壓形時(shí)的受力狀態(tài)和慣性矩來影響回彈。最后,根據(jù)研究結(jié)果并結(jié)合管材充液壓形成形工藝和零件的設(shè)計(jì)給出了控制回彈大小的方法,通過適度控制內(nèi)壓的加載、管材壁厚的選擇以及零件圓角半徑大小的設(shè)計(jì)控制回彈。
[Abstract]:As the representative of high-end manufacturing and advanced technology manufacturing, automotive industry and aerospace industry have higher and higher requirements for manufacturing technology, complex shape and structure, extremely high performance requirements, and integrated forming. There is more and more demand for thin-walled pipe fittings with lightweight structure design. Traditional stamping and welding processes are used in the manufacture of this kind of parts. With the progress of the technology and the appearance of the shortcomings of the traditional splice welding technology, the filling hydraulic forming technology has developed the advantages of the internal high pressure forming technology under this background, overcome the shortcomings of the internal high pressure forming technology, and has become a research hotspot in the manufacture of thin-walled pipe fittings. However, large-size thin-walled pipes and precision thin-walled fittings require higher forming accuracy and assembly performance, so the research on hydraulic shape springback of pipes is of great significance. In this paper, DP600 high-strength steel pipe is used as billet to study the springback law of hydraulic shape of pipe. Firstly, the influence and mechanism of internal pressure, radius of fillet and wall thickness on hydraulic springback of pipe are revealed by theoretical analysis, and the mathematical expressions of internal pressure, radius of fillet, wall thickness and springback quantity, circumferential force and bending moment are given. Secondly, the effects of internal pressure, radius of fillet and wall thickness on springback, circumferential force and bending moment are given by finite element simulation analysis, the correctness of theoretical analysis is verified, and the internal pressure and radius of fillet are given. The effect of wall thickness on the springback profile of pipe filled with hydraulic pressure; Finally, experimental research is carried out based on theoretical analysis and finite element simulation results. The experimental results are in good agreement with the theoretical analysis and finite element simulation results, which provide some reference for controlling the springback of pipe filling hydraulic shape. The results show that with the increase of internal pressure, the springback of hydraulic-filled pipe first increases and then decreases, the internal pressure of the maximum springback is critical internal pressure of rebound, the springback of hydraulic-filled pipe decreases with the increase of the radius of the fillet, and the springback of the hydraulic-filled tube decreases with the increase of the radius of the fillet. In addition, the radius of the fillet determines the critical internal pressure of springback, and the larger the radius of the fillet, the smaller the critical internal pressure of springback, which indicates that the effect of the radius of the fillet and the internal pressure on the springback of the tube filled with hydraulic pressure is coupled; The effect of wall thickness on the springback of hydraulic shape is affected by the internal pressure, which determines the regularity of the effect of wall thickness on the springback of the hydraulic shape of pipe filling. The mechanism of the influence of internal pressure and radius of fillet on hydraulic shape springback of pipe is that by changing the size and direction of circumferential force and bending moment, the pipe can be deformed in different deformation forms such as tension bending, compression bending, pure bending and so on. The wall thickness affects the springback by changing the force state and moment of inertia of the tube when the hydraulic profile is filled. Finally, according to the research results and combined with the hydraulic forming process of pipe filling and the design of parts, the method of controlling the springback size is given, and the loading of internal pressure is controlled appropriately. The selection of tube wall thickness and the design of fillet radius control springback.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG394
本文編號(hào)：2438606
[Abstract]:As the representative of high-end manufacturing and advanced technology manufacturing, automotive industry and aerospace industry have higher and higher requirements for manufacturing technology, complex shape and structure, extremely high performance requirements, and integrated forming. There is more and more demand for thin-walled pipe fittings with lightweight structure design. Traditional stamping and welding processes are used in the manufacture of this kind of parts. With the progress of the technology and the appearance of the shortcomings of the traditional splice welding technology, the filling hydraulic forming technology has developed the advantages of the internal high pressure forming technology under this background, overcome the shortcomings of the internal high pressure forming technology, and has become a research hotspot in the manufacture of thin-walled pipe fittings. However, large-size thin-walled pipes and precision thin-walled fittings require higher forming accuracy and assembly performance, so the research on hydraulic shape springback of pipes is of great significance. In this paper, DP600 high-strength steel pipe is used as billet to study the springback law of hydraulic shape of pipe. Firstly, the influence and mechanism of internal pressure, radius of fillet and wall thickness on hydraulic springback of pipe are revealed by theoretical analysis, and the mathematical expressions of internal pressure, radius of fillet, wall thickness and springback quantity, circumferential force and bending moment are given. Secondly, the effects of internal pressure, radius of fillet and wall thickness on springback, circumferential force and bending moment are given by finite element simulation analysis, the correctness of theoretical analysis is verified, and the internal pressure and radius of fillet are given. The effect of wall thickness on the springback profile of pipe filled with hydraulic pressure; Finally, experimental research is carried out based on theoretical analysis and finite element simulation results. The experimental results are in good agreement with the theoretical analysis and finite element simulation results, which provide some reference for controlling the springback of pipe filling hydraulic shape. The results show that with the increase of internal pressure, the springback of hydraulic-filled pipe first increases and then decreases, the internal pressure of the maximum springback is critical internal pressure of rebound, the springback of hydraulic-filled pipe decreases with the increase of the radius of the fillet, and the springback of the hydraulic-filled tube decreases with the increase of the radius of the fillet. In addition, the radius of the fillet determines the critical internal pressure of springback, and the larger the radius of the fillet, the smaller the critical internal pressure of springback, which indicates that the effect of the radius of the fillet and the internal pressure on the springback of the tube filled with hydraulic pressure is coupled; The effect of wall thickness on the springback of hydraulic shape is affected by the internal pressure, which determines the regularity of the effect of wall thickness on the springback of the hydraulic shape of pipe filling. The mechanism of the influence of internal pressure and radius of fillet on hydraulic shape springback of pipe is that by changing the size and direction of circumferential force and bending moment, the pipe can be deformed in different deformation forms such as tension bending, compression bending, pure bending and so on. The wall thickness affects the springback by changing the force state and moment of inertia of the tube when the hydraulic profile is filled. Finally, according to the research results and combined with the hydraulic forming process of pipe filling and the design of parts, the method of controlling the springback size is given, and the loading of internal pressure is controlled appropriately. The selection of tube wall thickness and the design of fillet radius control springback.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG394
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