本文選題：304不銹鋼 + 機(jī)械擴(kuò)徑��； 參考：《燕山大學(xué)》2015年碩士論文

【摘要】：304不銹鋼筒形旋壓件是某航天院研究所研制的一種產(chǎn)品。旋壓后的筒形件橫截面橢圓度增大,不能滿足產(chǎn)品的技術(shù)要求,制品母線的直線度也存在改善的空間。因此,產(chǎn)品研制單位提出采用機(jī)械擴(kuò)徑技術(shù)來消除制品成形精度超差現(xiàn)象的設(shè)想。機(jī)械擴(kuò)徑技術(shù)是一種普遍使用的塑性成形工藝方法,被廣泛應(yīng)用于薄壁旋壓筒形件、大直徑直縫焊管、大直徑螺旋焊管及其它大中型管筒形零件的最終成形。本文通過理論分析、MARC有限元數(shù)值模擬和實(shí)驗(yàn),對(duì)304不銹鋼筒形旋壓件機(jī)械擴(kuò)徑技術(shù)進(jìn)行了系統(tǒng)研究。研究?jī)?nèi)容包括:擴(kuò)徑變形過程及變形特征分析、擴(kuò)徑工藝參數(shù)和模具形狀尺寸對(duì)制品質(zhì)量的影響,304不銹鋼管機(jī)械擴(kuò)徑實(shí)驗(yàn)設(shè)計(jì)。通過仿真模擬發(fā)現(xiàn),管坯經(jīng)“整圓”、“擴(kuò)徑”和“卸載”三個(gè)階段完成變形過程。模具外圓半徑、邊緣圓角半徑、塑性擴(kuò)徑率、管坯初始橢圓度及直線度分別對(duì)制品橫截面橢圓度、壁厚分布、回彈及直線度產(chǎn)生不同程度的影響。經(jīng)實(shí)驗(yàn)研究后發(fā)現(xiàn),304不銹鋼經(jīng)過旋壓后出現(xiàn)明顯的加工硬化現(xiàn)象,屈強(qiáng)比達(dá)到0.9以上,強(qiáng)度變高,塑性變差,傳統(tǒng)的機(jī)械擴(kuò)徑工藝很難實(shí)現(xiàn)對(duì)制品的整形。
[Abstract]:304 stainless steel cylinder spinning part is a kind of product developed by the Institute of Aerospace Research. The ellipticity of the cross section of the cylinder after spinning can not meet the technical requirements of the product, and there is room for improvement of the straightness of the product busbar. Therefore, the product development unit put forward the idea of using mechanical diameter expansion technology to eliminate the phenomenon of product forming precision overshoot. Mechanical diameter expansion is a widely used plastic forming method, which is widely used in the final forming of thin wall spinning tube, large diameter straight welded pipe, large diameter spiral welded pipe and other large and medium tube shape parts. Based on the theoretical analysis of Marc finite element numerical simulation and experiment, the mechanical diameter expansion technology of 304 stainless steel cylindrical spinning parts is studied systematically. The research contents include: the analysis of the deformation process and deformation characteristics of the expanding diameter, the influence of the process parameters and the shape and size of the die on the quality of the products, and the experimental design of the mechanical diameter expansion of 304 stainless steel tube. Through simulation, it is found that the deformation process of the tube billet is completed by three stages: "whole circle", "expanding diameter" and "unloading". The outside circle radius, edge radius, plastic diameter expansion rate, initial ellipticity and straightness of tube billet have different effects on cross section ellipticity, wall thickness distribution, springback and straightness, respectively. After experimental study, it is found that the working-hardening phenomenon is obvious after spinning. The flexural strength ratio is more than 0.9, the strength becomes higher, and the plasticity becomes worse. It is very difficult to realize the plastic shaping of the products by the traditional mechanical expanding process.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG306

【參考文獻(xiàn)】

相關(guān)期刊論文 前8條

1 李新和;楊新泉;王艷芬;;薄壁筒形件旋壓成形的研究進(jìn)展[J];鍛壓技術(shù);2011年01期

2 張遠(yuǎn)生,王占理,王晨,魯慧文;大直徑焊管生產(chǎn)用擴(kuò)徑機(jī)簡(jiǎn)介[J];鋼管;2000年06期

3 劉世澤,謝仕強(qiáng);直縫埋弧焊管擴(kuò)徑機(jī)的應(yīng)用[J];焊管;2003年02期

4 鄧波;李云龍;惠非;;直縫埋弧焊管機(jī)械擴(kuò)徑影響因素分析[J];焊管;2010年05期

5 郭寶鋒,聶紹珉,金淼;擴(kuò)徑力與擴(kuò)徑行程的主要影響因素和計(jì)算方法[J];塑性工程學(xué)報(bào);2002年03期

6 郭寶鋒,金淼,吳生富,聶紹珉;擴(kuò)徑率和重疊量對(duì)機(jī)械擴(kuò)徑制品品質(zhì)的影響[J];中國機(jī)械工程;2004年12期

7 付正榮;螺旋焊管冷擴(kuò)徑技術(shù)的試驗(yàn)研究[J];重型機(jī)械;1999年05期

8 范利鋒;高穎;李強(qiáng);宋聰惠;楊文濤;;大口徑直縫焊管機(jī)械擴(kuò)徑工藝的研究進(jìn)展[J];重型機(jī)械;2011年05期

，

本文編號(hào)：2063006