本文關(guān)鍵詞： 護環(huán) 液壓脹形 加載路徑 雙線性　出處：《燕山大學》2014年碩士論文　論文類型：學位論文

【摘要】：大型發(fā)電設(shè)備的國產(chǎn)化是關(guān)系國家經(jīng)濟持續(xù)發(fā)展、關(guān)系國家戰(zhàn)略安全的重要保障。護環(huán)是發(fā)電設(shè)備中重要的關(guān)鍵性零件之一。本文在NTA護環(huán)液壓脹形新工藝的基礎(chǔ)上，主要研究了55°模角下600MW大型護環(huán)液壓脹形的加載路徑。 基于平面有限元模型，研究了液體壓力單獨作用下，護環(huán)液壓脹形時內(nèi)外層變形特點，并擬合了塑性變形階段液體壓力與護環(huán)的尺寸關(guān)系�；�于軸對稱模型，研究了液體壓力和軸向力的變化對外層輪廓的影響規(guī)律。不同的模型內(nèi)外層產(chǎn)生塑性變形所需的液體壓力近似相等，在護環(huán)液壓脹形過程中液體壓力起主要作用；液體壓力和軸向力匹配合適，，可以使護環(huán)既不凸也不凹。 采用分段匹配的方法，把連續(xù)的脹形過程分成n個小過程，在滿足護環(huán)成形幾何質(zhì)量的前提下，分別研究每一小段過程的軸向力F和液體壓力P的匹配關(guān)系，確定了護環(huán)液壓脹形的加載路徑。進一步研究表明，加載路徑中軸向力F和液體壓力P的匹配關(guān)系可以近似簡化為雙線性線型，轉(zhuǎn)折點的液體壓力略小于護環(huán)外層發(fā)生塑性變形的臨界液體壓力。為了方便實際生產(chǎn)，把加載路徑簡化成雙線性型，并確定其雙線性拐點處的液體壓力略小于護環(huán)外層發(fā)生塑性變形的臨界液體壓力。 采用20#鋼進行了1:8的護環(huán)液壓脹形實驗。基于上述研究方法，獲得了20#鋼雙線性加載路徑，并用確定的加載路徑進行實驗，驗證了雙線性加載路徑的可行性。
[Abstract]:The localization of large-scale power generation equipment is related to the sustainable development of national economy. The protection ring is one of the most important parts in the power generation equipment. This paper is based on the new hydraulic bulging technology of NTA ring. The loading path of 600 MW large retaining ring hydraulic bulging under 55 擄die angle is studied. Based on the plane finite element model, the deformation characteristics of the inner and outer layers during the hydraulic bulging of the retaining ring under the liquid pressure alone are studied, and the relationship between the liquid pressure and the size of the retaining ring in the plastic deformation stage is fitted, based on the axisymmetric model. The influence of liquid pressure and axial force on the outer profile is studied. The liquid pressure required for plastic deformation in different inner and outer layers is approximately equal. Liquid pressure plays a major role in the hydraulic bulging process of retaining ring. The liquid pressure and axial force are matched properly to make the retaining ring neither convex nor concave. A piecewise matching method is used to divide the continuous bulging process into n small processes. The matching relationship between axial force F and liquid pressure P of each short process is studied respectively on the premise of satisfying the geometric quality of ring forming. The loading path of hydraulic bulging is determined. Further research shows that the matching relationship between axial force F and liquid pressure P in the loading path can be approximately simplified as a bilinear shape. The liquid pressure at the turning point is slightly smaller than the critical liquid pressure of plastic deformation in the outer layer of the protective ring. In order to facilitate practical production, the loading path is simplified as a bilinear type. It is determined that the liquid pressure at the bilinear inflection point is slightly smaller than the critical liquid pressure of plastic deformation in the outer layer of the retaining ring. The hydraulic bulging experiment of 1: 8 retaining ring was carried out with 20 # steel. Based on the above research method, the bilinear loading path of 20 # steel was obtained, and the experiment was carried out with the determined loading path. The feasibility of bilinear loading path is verified.
【學位授予單位】：燕山大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM31

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