【摘要】：采用激光立體成形制備了層數(shù)逐漸增加的塊狀試樣,分析了零件豎直外側(cè)壁向內(nèi)傾斜的原因.基于利用粉末累積高度重構(gòu)單道熔覆層橫截面輪廓的方法,構(gòu)建了描述豎直外側(cè)壁輪廓逐層演化的分析模型.利用該模型重構(gòu)了不同單道熔覆層寬高比和激光束有效作用范圍下的豎直外側(cè)壁輪廓,并分析了2者的影響.結(jié)果表明,逐層疊加過(guò)程中,已沉積的熔覆層將影響之后熔覆層的形成;由于單道熔覆層的橫截面為弧形,其與激光束相交形成的邊界熔池將向零件內(nèi)部收縮,從而引起邊界單道熔覆層向內(nèi)收縮及豎直外側(cè)壁向內(nèi)側(cè)傾斜;隨沉積高度增加,傾斜程度減小并趨于消失.初始單道熔覆層寬度一定時(shí),減小激光束有效作用范圍有利于外側(cè)壁趨于豎直但卻增大其偏離量;單道熔覆層寬高比對(duì)外側(cè)壁的影響幾乎可以忽略.
[Abstract]:Bulk samples with gradually increasing layers were prepared by laser stereoscopic forming, and the reason for the vertical lateral wall of the parts to be tilted inward was analyzed. Based on the method of reconstructing the cross-section profile of single-pass cladding layer by using the accumulated height of powder, an analytical model describing the layer-by-layer evolution of the profile of the vertical outer wall is constructed. The profile of vertical lateral wall with different width-to-height ratio of single-channel cladding layer and effective range of laser beam is reconstructed by using the model, and the influence of the two factors is analyzed. The results show that the deposited cladding layer will affect the formation of subsequent cladding layer in the process of layer-by-layer stacking. Because the cross-section of the single-pass cladding layer is arc, the boundary pool formed by its intersection with the laser beam will shrink to the interior of the part, resulting in the inner shrinkage of the single-pass cladding layer and the inclination of the vertical outer wall to the inside; With the increase of deposition height, the tilt degree decreases and tends to disappear. When the initial single-channel cladding layer width is constant, reducing the effective range of laser beam is beneficial for the lateral wall to tend to vertical but increase its deviation, and the influence of the width-height ratio of the single-pass cladding layer on the outer side wall is almost negligible.
【作者單位】： 西北工業(yè)大學(xué)凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目51323008 國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃項(xiàng)目2011CB610402 國(guó)家高技術(shù)研究發(fā)展計(jì)劃項(xiàng)目2013AA031103 凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室自主研究課題項(xiàng)目91-QZ-2014資助~~
【分類(lèi)號(hào)】：TG665

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