【摘要】：為了探究沖壓壓強(qiáng)和樣件表面粗糙度對22MnB5鋼板的界面換熱系數(shù)(Interfacial heat transfer coefficient,以下簡稱IHTC)的影響,自主設(shè)計了圓臺試驗?zāi)Ｐ?利用Beck非線性估算法,求解熱成形工藝中高溫樣件與低溫模具間界面換熱系數(shù)。實(shí)驗中通過調(diào)整沖壓壓強(qiáng)和改變樣件表面粗糙度的方式,進(jìn)而改變模具與樣件間接觸表面微觀形貌,探究其對IHTC的影響。研究表明:壓強(qiáng)與IHTC存在高度近似的正冪函數(shù)關(guān)系;粗糙度也會對IHTC產(chǎn)生影響,并且當(dāng)粗糙度大于1μm時,IHTC值會隨粗糙度的增大而明顯減小,當(dāng)粗糙度小于1μm時,由于表面氧化皮的影響,IHTC將隨粗糙度值的減小而增大放緩,甚至趨于定值而不再增加。
[Abstract]:In order to investigate the influence of stamping pressure and sample surface roughness on the interfacial heat transfer coefficient (Interfacial heat transfer coefficient,) of 22MnB5 steel plate, a circular test model was designed, and the Beck nonlinear estimation method was used. The interfacial heat transfer coefficient between high temperature sample and low temperature die is calculated. In the experiment, by adjusting the stamping pressure and changing the surface roughness of the sample, and then changing the micro-morphology of the contact surface between the die and the sample, the influence on IHTC is explored. The results show that there is a highly approximate positive power function relationship between pressure and IHTC. Roughness also affects IHTC, and when the roughness is greater than 1 渭 m, the IHTC value decreases obviously with the increase of roughness. When the roughness is less than 1 渭 m, the IHTC increases with the decrease of roughness due to the influence of surface oxide film. It even tends to be fixed and no longer increases.
【作者單位】： 大連理工大學(xué)工業(yè)裝備結(jié)構(gòu)分析重點(diǎn)實(shí)驗室;大連理工大學(xué)汽車工程學(xué)院;鋼鐵研究總院特殊鋼研究所;
【基金】：國家自然科學(xué)基金(51101036,51201093,11472072) 遼寧省自然科學(xué)基金(優(yōu)秀人才培養(yǎng),2014028001)
【分類號】：TG142.1

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相關(guān)期刊論文 前3條

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